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|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988 AT&T
* All Rights Reserved
*
* Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* Update the new output file image, perform virtual address, offset and
* displacement calculations on the program headers and sections headers,
* and generate any new output section information.
*/
#define ELF_TARGET_AMD64
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <debug.h>
#include "msg.h"
#include "_libld.h"
/*
* Comparison routine used by qsort() for sorting of the global symbol list
* based off of the hashbuckets the symbol will eventually be deposited in.
*/
static int
sym_hash_compare(Sym_s_list * s1, Sym_s_list * s2)
{
return (s1->sl_hval - s2->sl_hval);
}
/*
* Comparison routine used by qsort() for sorting of dyn[sym|tls]sort section
* indices based on the address of the symbols they reference. The
* use of the global dynsort_compare_syms variable is needed because
* we need to examine the symbols the indices reference. It is safe, because
* the linker is single threaded.
*/
static Sym *dynsort_compare_syms;
static int
dynsort_compare(const void *idx1, const void *idx2)
{
Sym *s1 = dynsort_compare_syms + *((const Word *) idx1);
Sym *s2 = dynsort_compare_syms + *((const Word *) idx2);
/*
* Note: the logical computation for this is
* (st_value1 - st_value2)
* However, that is only correct if the address type is smaller
* than a pointer. Writing it this way makes it immune to the
* class (32 or 64-bit) of the linker.
*/
return ((s1->st_value < s2->st_value) ? -1 :
(s1->st_value > s2->st_value));
}
/*
* Scan the sorted symbols, and issue warnings if there are any duplicate
* values in the list. We only do this if -zverbose is set, or we are
* running with LD_DEBUG defined
*
* entry:
* ofl - Output file descriptor
* ldynsym - Pointer to start of .SUNW_ldynsym section that the
* sort section indexes reference.
* symsort - Pointer to start of .SUNW_dynsymsort or .SUNW_dyntlssort
* section.
* n - # of indices in symsort array
* secname - Name of the symsort section.
*
* exit:
* If the symsort section contains indexes to more than one
* symbol with the same address value, a warning is issued.
*/
static void
dynsort_dupwarn(Ofl_desc *ofl, Sym *ldynsym, const char *str,
Word *symsort, Word n, const char *secname)
{
int zverbose = (ofl->ofl_flags & FLG_OF_VERBOSE) != 0;
Word ndx, cmp_ndx;
Addr addr, cmp_addr;
/* Nothing to do if -zverbose or LD_DEBUG are not active */
if (!(zverbose || DBG_ENABLED))
return;
cmp_ndx = 0;
cmp_addr = ldynsym[symsort[cmp_ndx]].st_value;
for (ndx = 1; ndx < n; ndx++) {
addr = ldynsym[symsort[ndx]].st_value;
if (cmp_addr == addr) {
if (zverbose)
ld_eprintf(ofl, ERR_WARNING,
MSG_INTL(MSG_SYM_DUPSORTADDR), secname,
str + ldynsym[symsort[cmp_ndx]].st_name,
str + ldynsym[symsort[ndx]].st_name,
EC_ADDR(addr));
DBG_CALL(Dbg_syms_dup_sort_addr(ofl->ofl_lml, secname,
str + ldynsym[symsort[cmp_ndx]].st_name,
str + ldynsym[symsort[ndx]].st_name,
EC_ADDR(addr)));
} else { /* Not a dup. Move reference up */
cmp_ndx = ndx;
cmp_addr = addr;
}
}
}
/*
* Build and update any output symbol tables. Here we work on all the symbol
* tables at once to reduce the duplication of symbol and string manipulation.
* Symbols and their associated strings are copied from the read-only input
* file images to the output image and their values and index's updated in the
* output image.
*/
static Addr
update_osym(Ofl_desc *ofl)
{
/*
* There are several places in this function where we wish
* to insert a symbol index to the combined .SUNW_ldynsym/.dynsym
* symbol table into one of the two sort sections (.SUNW_dynsymsort
* or .SUNW_dyntlssort), if that symbol has the right attributes.
* This macro is used to generate the necessary code from a single
* specification.
*
* entry:
* _sdp, _sym, _type - As per DYNSORT_COUNT. See _libld.h
* _sym_ndx - Index that _sym will have in the combined
* .SUNW_ldynsym/.dynsym symbol table.
*/
#define ADD_TO_DYNSORT(_sdp, _sym, _type, _sym_ndx) \
{ \
Word *_dynsort_arr, *_dynsort_ndx; \
\
if (dynsymsort_symtype[_type]) { \
_dynsort_arr = dynsymsort; \
_dynsort_ndx = &dynsymsort_ndx; \
} else if (_type == STT_TLS) { \
_dynsort_arr = dyntlssort; \
_dynsort_ndx = &dyntlssort_ndx; \
} else { \
_dynsort_arr = NULL; \
} \
if ((_dynsort_arr != NULL) && DYNSORT_TEST_ATTR(_sdp, _sym)) \
_dynsort_arr[(*_dynsort_ndx)++] = _sym_ndx; \
}
Sym_desc *sdp;
Sym_avlnode *sav;
Sg_desc *sgp, *tsgp = NULL, *dsgp = NULL, *esgp = NULL;
Os_desc *osp, *iosp = NULL, *fosp = NULL;
Is_desc *isc;
Ifl_desc *ifl;
Word bssndx, etext_ndx, edata_ndx = 0, end_ndx, start_ndx;
Word end_abs = 0, etext_abs = 0, edata_abs;
Word tlsbssndx = 0, parexpnndx;
#if defined(_ELF64)
Word lbssndx = 0;
Addr lbssaddr = 0;
#endif
Addr bssaddr, etext = 0, edata = 0, end = 0, start = 0;
Addr tlsbssaddr = 0;
Addr parexpnbase, parexpnaddr;
int start_set = 0;
Sym _sym = {0}, *sym, *symtab = NULL;
Sym *dynsym = NULL, *ldynsym = NULL;
Word symtab_ndx = 0; /* index into .symtab */
Word symtab_gbl_bndx; /* .symtab ndx 1st global */
Word ldynsym_ndx = 0; /* index into .SUNW_ldynsym */
Word dynsym_ndx = 0; /* index into .dynsym */
Word scopesym_ndx = 0; /* index into scoped symbols */
Word scopesym_bndx = 0; /* .symtab ndx 1st scoped sym */
Word ldynscopesym_ndx = 0; /* index to ldynsym scoped */
/* symbols */
Word *dynsymsort = NULL; /* SUNW_dynsymsort index */
/* vector */
Word *dyntlssort = NULL; /* SUNW_dyntlssort index */
/* vector */
Word dynsymsort_ndx; /* index dynsymsort array */
Word dyntlssort_ndx; /* index dyntlssort array */
Word *symndx; /* symbol index (for */
/* relocation use) */
Word *symshndx = NULL; /* .symtab_shndx table */
Word *dynshndx = NULL; /* .dynsym_shndx table */
Word *ldynshndx = NULL; /* .SUNW_ldynsym_shndx table */
Word ldynsym_cnt = 0; /* number of items in */
/* .SUNW_ldynsym */
Str_tbl *shstrtab;
Str_tbl *strtab;
Str_tbl *dynstr;
Word *hashtab; /* hash table pointer */
Word *hashbkt; /* hash table bucket pointer */
Word *hashchain; /* hash table chain pointer */
Wk_desc *wkp;
Alist *weak = NULL;
ofl_flag_t flags = ofl->ofl_flags;
Versym *versym;
Gottable *gottable; /* used for display got debugging */
/* information */
Syminfo *syminfo;
Sym_s_list *sorted_syms; /* table to hold sorted symbols */
Word ssndx; /* global index into sorted_syms */
Word scndx; /* scoped index into sorted_syms */
size_t stoff; /* string offset */
Aliste idx1;
/*
* Initialize pointers to the symbol table entries and the symbol
* table strings. Skip the first symbol entry and the first string
* table byte. Note that if we are not generating any output symbol
* tables we must still generate and update internal copies so
* that the relocation phase has the correct information.
*/
if (!(flags & FLG_OF_STRIP) || (flags & FLG_OF_RELOBJ) ||
((flags & FLG_OF_STATIC) && ofl->ofl_osversym)) {
symtab = (Sym *)ofl->ofl_ossymtab->os_outdata->d_buf;
symtab[symtab_ndx++] = _sym;
if (ofl->ofl_ossymshndx)
symshndx =
(Word *)ofl->ofl_ossymshndx->os_outdata->d_buf;
}
if (OFL_ALLOW_DYNSYM(ofl)) {
dynsym = (Sym *)ofl->ofl_osdynsym->os_outdata->d_buf;
dynsym[dynsym_ndx++] = _sym;
/*
* If we are also constructing a .SUNW_ldynsym section
* to contain local function symbols, then set it up too.
*/
if (ofl->ofl_osldynsym) {
ldynsym = (Sym *)ofl->ofl_osldynsym->os_outdata->d_buf;
ldynsym[ldynsym_ndx++] = _sym;
ldynsym_cnt = 1 + ofl->ofl_dynlocscnt +
ofl->ofl_dynscopecnt;
/*
* If there is a SUNW_ldynsym, then there may also
* be a .SUNW_dynsymsort and/or .SUNW_dyntlssort
* sections, used to collect indices of function
* and data symbols sorted by address order.
*/
if (ofl->ofl_osdynsymsort) { /* .SUNW_dynsymsort */
dynsymsort = (Word *)
ofl->ofl_osdynsymsort->os_outdata->d_buf;
dynsymsort_ndx = 0;
}
if (ofl->ofl_osdyntlssort) { /* .SUNW_dyntlssort */
dyntlssort = (Word *)
ofl->ofl_osdyntlssort->os_outdata->d_buf;
dyntlssort_ndx = 0;
}
}
/*
* Initialize the hash table.
*/
hashtab = (Word *)(ofl->ofl_oshash->os_outdata->d_buf);
hashbkt = &hashtab[2];
hashchain = &hashtab[2 + ofl->ofl_hashbkts];
hashtab[0] = ofl->ofl_hashbkts;
hashtab[1] = DYNSYM_ALL_CNT(ofl);
if (ofl->ofl_osdynshndx)
dynshndx =
(Word *)ofl->ofl_osdynshndx->os_outdata->d_buf;
if (ofl->ofl_osldynshndx)
ldynshndx =
(Word *)ofl->ofl_osldynshndx->os_outdata->d_buf;
}
/*
* symndx is the symbol index to be used for relocation processing. It
* points to the relevant symtab's (.dynsym or .symtab) symbol ndx.
*/
if (dynsym)
symndx = &dynsym_ndx;
else
symndx = &symtab_ndx;
/*
* If we have version definitions initialize the version symbol index
* table. There is one entry for each symbol which contains the symbols
* version index.
*/
if (!(flags & FLG_OF_NOVERSEC) &&
(flags & (FLG_OF_VERNEED | FLG_OF_VERDEF))) {
versym = (Versym *)ofl->ofl_osversym->os_outdata->d_buf;
versym[0] = 0;
} else
versym = NULL;
/*
* If syminfo section exists be prepared to fill it in.
*/
if (ofl->ofl_ossyminfo) {
syminfo = ofl->ofl_ossyminfo->os_outdata->d_buf;
syminfo[0].si_flags = SYMINFO_CURRENT;
} else
syminfo = NULL;
/*
* Setup our string tables.
*/
shstrtab = ofl->ofl_shdrsttab;
strtab = ofl->ofl_strtab;
dynstr = ofl->ofl_dynstrtab;
DBG_CALL(Dbg_syms_sec_title(ofl->ofl_lml));
/*
* Put output file name to the first .symtab and .SUNW_ldynsym symbol.
*/
if (symtab) {
(void) st_setstring(strtab, ofl->ofl_name, &stoff);
sym = &symtab[symtab_ndx++];
/* LINTED */
sym->st_name = stoff;
sym->st_value = 0;
sym->st_size = 0;
sym->st_info = ELF_ST_INFO(STB_LOCAL, STT_FILE);
sym->st_other = 0;
sym->st_shndx = SHN_ABS;
if (versym && !dynsym)
versym[1] = 0;
}
if (ldynsym) {
(void) st_setstring(dynstr, ofl->ofl_name, &stoff);
sym = &ldynsym[ldynsym_ndx];
/* LINTED */
sym->st_name = stoff;
sym->st_value = 0;
sym->st_size = 0;
sym->st_info = ELF_ST_INFO(STB_LOCAL, STT_FILE);
sym->st_other = 0;
sym->st_shndx = SHN_ABS;
/* Scoped symbols get filled in global loop below */
ldynscopesym_ndx = ldynsym_ndx + 1;
ldynsym_ndx += ofl->ofl_dynscopecnt;
}
/*
* If we are to display GOT summary information, then allocate
* the buffer to 'cache' the GOT symbols into now.
*/
if (DBG_ENABLED) {
if ((ofl->ofl_gottable = gottable =
libld_calloc(ofl->ofl_gotcnt, sizeof (Gottable))) == NULL)
return ((Addr)S_ERROR);
}
/*
* Traverse the program headers. Determine the last executable segment
* and the last data segment so that we can update etext and edata. If
* we have empty segments (reservations) record them for setting _end.
*/
for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
Phdr *phd = &(sgp->sg_phdr);
Os_desc *osp;
Aliste idx2;
if (phd->p_type == PT_LOAD) {
if (sgp->sg_osdescs != NULL) {
Word _flags = phd->p_flags & (PF_W | PF_R);
if (_flags == PF_R)
tsgp = sgp;
else if (_flags == (PF_W | PF_R))
dsgp = sgp;
} else if (sgp->sg_flags & FLG_SG_EMPTY)
esgp = sgp;
}
/*
* Generate a section symbol for each output section.
*/
for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
Word sectndx;
sym = &_sym;
sym->st_value = osp->os_shdr->sh_addr;
sym->st_info = ELF_ST_INFO(STB_LOCAL, STT_SECTION);
/* LINTED */
sectndx = elf_ndxscn(osp->os_scn);
if (symtab) {
if (sectndx >= SHN_LORESERVE) {
symshndx[symtab_ndx] = sectndx;
sym->st_shndx = SHN_XINDEX;
} else {
/* LINTED */
sym->st_shndx = (Half)sectndx;
}
symtab[symtab_ndx++] = *sym;
}
if (dynsym && (osp->os_flags & FLG_OS_OUTREL))
dynsym[dynsym_ndx++] = *sym;
if ((dynsym == NULL) ||
(osp->os_flags & FLG_OS_OUTREL)) {
if (versym)
versym[*symndx - 1] = 0;
osp->os_identndx = *symndx - 1;
DBG_CALL(Dbg_syms_sec_entry(ofl->ofl_lml,
osp->os_identndx, sgp, osp));
}
/*
* Generate the .shstrtab for this section.
*/
(void) st_setstring(shstrtab, osp->os_name, &stoff);
osp->os_shdr->sh_name = (Word)stoff;
/*
* Find the section index for our special symbols.
*/
if (sgp == tsgp) {
/* LINTED */
etext_ndx = elf_ndxscn(osp->os_scn);
} else if (dsgp == sgp) {
if (osp->os_shdr->sh_type != SHT_NOBITS) {
/* LINTED */
edata_ndx = elf_ndxscn(osp->os_scn);
}
}
if (start_set == 0) {
start = sgp->sg_phdr.p_vaddr;
/* LINTED */
start_ndx = elf_ndxscn(osp->os_scn);
start_set++;
}
/*
* While we're here, determine whether a .init or .fini
* section exist.
*/
if ((iosp == NULL) && (strcmp(osp->os_name,
MSG_ORIG(MSG_SCN_INIT)) == 0))
iosp = osp;
if ((fosp == NULL) && (strcmp(osp->os_name,
MSG_ORIG(MSG_SCN_FINI)) == 0))
fosp = osp;
}
}
/*
* Add local register symbols to the .dynsym. These are required as
* DT_REGISTER .dynamic entries must have a symbol to reference.
*/
if (ofl->ofl_regsyms && dynsym) {
int ndx;
for (ndx = 0; ndx < ofl->ofl_regsymsno; ndx++) {
Sym_desc *rsdp;
if ((rsdp = ofl->ofl_regsyms[ndx]) == NULL)
continue;
if (!SYM_IS_HIDDEN(rsdp) &&
(ELF_ST_BIND(rsdp->sd_sym->st_info) != STB_LOCAL))
continue;
dynsym[dynsym_ndx] = *(rsdp->sd_sym);
rsdp->sd_symndx = *symndx;
if (dynsym[dynsym_ndx].st_name) {
(void) st_setstring(dynstr, rsdp->sd_name,
&stoff);
dynsym[dynsym_ndx].st_name = stoff;
}
dynsym_ndx++;
}
}
/*
* Having traversed all the output segments, warn the user if the
* traditional text or data segments don't exist. Otherwise from these
* segments establish the values for `etext', `edata', `end', `END',
* and `START'.
*/
if (!(flags & FLG_OF_RELOBJ)) {
Sg_desc *sgp;
if (tsgp)
etext = tsgp->sg_phdr.p_vaddr + tsgp->sg_phdr.p_filesz;
else {
etext = (Addr)0;
etext_ndx = SHN_ABS;
etext_abs = 1;
if (flags & FLG_OF_VERBOSE)
ld_eprintf(ofl, ERR_WARNING,
MSG_INTL(MSG_UPD_NOREADSEG));
}
if (dsgp) {
edata = dsgp->sg_phdr.p_vaddr + dsgp->sg_phdr.p_filesz;
} else {
edata = (Addr)0;
edata_ndx = SHN_ABS;
edata_abs = 1;
if (flags & FLG_OF_VERBOSE)
ld_eprintf(ofl, ERR_WARNING,
MSG_INTL(MSG_UPD_NORDWRSEG));
}
if (dsgp == NULL) {
if (tsgp)
sgp = tsgp;
else
sgp = 0;
} else if (tsgp == NULL)
sgp = dsgp;
else if (dsgp->sg_phdr.p_vaddr > tsgp->sg_phdr.p_vaddr)
sgp = dsgp;
else if (dsgp->sg_phdr.p_vaddr < tsgp->sg_phdr.p_vaddr)
sgp = tsgp;
else {
/*
* One of the segments must be of zero size.
*/
if (tsgp->sg_phdr.p_memsz)
sgp = tsgp;
else
sgp = dsgp;
}
if (esgp && (esgp->sg_phdr.p_vaddr > sgp->sg_phdr.p_vaddr))
sgp = esgp;
if (sgp) {
end = sgp->sg_phdr.p_vaddr + sgp->sg_phdr.p_memsz;
/*
* If the last loadable segment is a read-only segment,
* then the application which uses the symbol _end to
* find the beginning of writable heap area may cause
* segmentation violation. We adjust the value of the
* _end to skip to the next page boundary.
*
* 6401812 System interface which returs beginning
* heap would be nice.
* When the above RFE is implemented, the changes below
* could be changed in a better way.
*/
if ((sgp->sg_phdr.p_flags & PF_W) == 0)
end = (Addr)S_ROUND(end, sysconf(_SC_PAGESIZE));
/*
* If we're dealing with a memory reservation there are
* no sections to establish an index for _end, so assign
* it as an absolute.
*/
if (sgp->sg_osdescs != NULL) {
/*
* Determine the last section for this segment.
*/
Os_desc *osp = sgp->sg_osdescs->apl_data
[sgp->sg_osdescs->apl_nitems - 1];
/* LINTED */
end_ndx = elf_ndxscn(osp->os_scn);
} else {
end_ndx = SHN_ABS;
end_abs = 1;
}
} else {
end = (Addr) 0;
end_ndx = SHN_ABS;
end_abs = 1;
ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_UPD_NOSEG));
}
}
/*
* Initialize the scoped symbol table entry point. This is for all
* the global symbols that have been scoped to locals and will be
* filled in during global symbol processing so that we don't have
* to traverse the globals symbol hash array more than once.
*/
if (symtab) {
scopesym_bndx = symtab_ndx;
scopesym_ndx = scopesym_bndx;
symtab_ndx += ofl->ofl_scopecnt;
}
/*
* If expanding partially expanded symbols under '-z nopartial',
* prepare to do that.
*/
if (ofl->ofl_isparexpn) {
osp = ofl->ofl_isparexpn->is_osdesc;
parexpnbase = parexpnaddr = (Addr)(osp->os_shdr->sh_addr +
ofl->ofl_isparexpn->is_indata->d_off);
/* LINTED */
parexpnndx = elf_ndxscn(osp->os_scn);
ofl->ofl_parexpnndx = osp->os_identndx;
}
/*
* If we are generating a .symtab collect all the local symbols,
* assigning a new virtual address or displacement (value).
*/
for (APLIST_TRAVERSE(ofl->ofl_objs, idx1, ifl)) {
Xword lndx, local = ifl->ifl_locscnt;
Cap_desc *cdp = ifl->ifl_caps;
for (lndx = 1; lndx < local; lndx++) {
Gotndx *gnp;
uchar_t type;
Word *_symshndx;
int enter_in_symtab, enter_in_ldynsym;
int update_done;
sdp = ifl->ifl_oldndx[lndx];
sym = sdp->sd_sym;
/*
* Assign a got offset if necessary.
*/
if ((ld_targ.t_mr.mr_assign_got != NULL) &&
(*ld_targ.t_mr.mr_assign_got)(ofl, sdp) == S_ERROR)
return ((Addr)S_ERROR);
if (DBG_ENABLED) {
Aliste idx2;
for (ALIST_TRAVERSE(sdp->sd_GOTndxs,
idx2, gnp)) {
gottable->gt_sym = sdp;
gottable->gt_gndx.gn_gotndx =
gnp->gn_gotndx;
gottable->gt_gndx.gn_addend =
gnp->gn_addend;
gottable++;
}
}
if ((type = ELF_ST_TYPE(sym->st_info)) == STT_SECTION)
continue;
/*
* Ignore any symbols that have been marked as invalid
* during input processing. Providing these aren't used
* for relocation they'll just be dropped from the
* output image.
*/
if (sdp->sd_flags & FLG_SY_INVALID)
continue;
/*
* If the section that this symbol was associated
* with has been discarded - then we discard
* the local symbol along with it.
*/
if (sdp->sd_flags & FLG_SY_ISDISC)
continue;
/*
* If this symbol is from a different file
* than the input descriptor we are processing,
* treat it as if it has FLG_SY_ISDISC set.
* This happens when sloppy_comdat_reloc()
* replaces a symbol to a discarded comdat section
* with an equivalent symbol from a different
* file. We only want to enter such a symbol
* once --- as part of the file that actually
* supplies it.
*/
if (ifl != sdp->sd_file)
continue;
/*
* Generate an output symbol to represent this input
* symbol. Even if the symbol table is to be stripped
* we still need to update any local symbols that are
* used during relocation.
*/
enter_in_symtab = symtab &&
(!(ofl->ofl_flags & FLG_OF_REDLSYM) ||
sdp->sd_move);
enter_in_ldynsym = ldynsym &&
((sym->st_name != 0) || (type == STT_FILE)) &&
ldynsym_symtype[type] &&
!(ofl->ofl_flags & FLG_OF_REDLSYM);
_symshndx = NULL;
if (enter_in_symtab) {
if (!dynsym)
sdp->sd_symndx = *symndx;
symtab[symtab_ndx] = *sym;
/*
* Provided this isn't an unnamed register
* symbol, update its name.
*/
if (((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
symtab[symtab_ndx].st_name) {
(void) st_setstring(strtab,
sdp->sd_name, &stoff);
symtab[symtab_ndx].st_name = stoff;
}
sdp->sd_flags &= ~FLG_SY_CLEAN;
if (symshndx)
_symshndx = &symshndx[symtab_ndx];
sdp->sd_sym = sym = &symtab[symtab_ndx++];
if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
(sym->st_shndx == SHN_ABS) &&
!enter_in_ldynsym)
continue;
} else if (enter_in_ldynsym) {
/*
* Not using symtab, but we do have ldynsym
* available.
*/
ldynsym[ldynsym_ndx] = *sym;
(void) st_setstring(dynstr, sdp->sd_name,
&stoff);
ldynsym[ldynsym_ndx].st_name = stoff;
sdp->sd_flags &= ~FLG_SY_CLEAN;
if (ldynshndx)
_symshndx = &ldynshndx[ldynsym_ndx];
sdp->sd_sym = sym = &ldynsym[ldynsym_ndx];
/* Add it to sort section if it qualifies */
ADD_TO_DYNSORT(sdp, sym, type, ldynsym_ndx);
ldynsym_ndx++;
} else { /* Not using symtab or ldynsym */
/*
* If this symbol requires modifying to provide
* for a relocation or move table update, make
* a copy of it.
*/
if (!(sdp->sd_flags & FLG_SY_UPREQD) &&
!(sdp->sd_move))
continue;
if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
(sym->st_shndx == SHN_ABS))
continue;
if (ld_sym_copy(sdp) == S_ERROR)
return ((Addr)S_ERROR);
sym = sdp->sd_sym;
}
/*
* Update the symbols contents if necessary.
*/
update_done = 0;
if (type == STT_FILE) {
sdp->sd_shndx = sym->st_shndx = SHN_ABS;
sdp->sd_flags |= FLG_SY_SPECSEC;
update_done = 1;
}
/*
* If we are expanding the locally bound partially
* initialized symbols, then update the address here.
*/
if (ofl->ofl_isparexpn &&
(sdp->sd_flags & FLG_SY_PAREXPN) && !update_done) {
sym->st_shndx = parexpnndx;
sdp->sd_isc = ofl->ofl_isparexpn;
sym->st_value = parexpnaddr;
parexpnaddr += sym->st_size;
if ((flags & FLG_OF_RELOBJ) == 0)
sym->st_value -= parexpnbase;
}
/*
* If this isn't an UNDEF symbol (ie. an input section
* is associated), update the symbols value and index.
*/
if (((isc = sdp->sd_isc) != NULL) && !update_done) {
Word sectndx;
osp = isc->is_osdesc;
/* LINTED */
sym->st_value +=
(Off)_elf_getxoff(isc->is_indata);
if ((flags & FLG_OF_RELOBJ) == 0) {
sym->st_value += osp->os_shdr->sh_addr;
/*
* TLS symbols are relative to
* the TLS segment.
*/
if ((type == STT_TLS) &&
(ofl->ofl_tlsphdr)) {
sym->st_value -=
ofl->ofl_tlsphdr->p_vaddr;
}
}
/* LINTED */
if ((sdp->sd_shndx = sectndx =
elf_ndxscn(osp->os_scn)) >= SHN_LORESERVE) {
if (_symshndx) {
*_symshndx = sectndx;
}
sym->st_shndx = SHN_XINDEX;
} else {
/* LINTED */
sym->st_shndx = sectndx;
}
}
/*
* If entering the symbol in both the symtab and the
* ldynsym, then the one in symtab needs to be
* copied to ldynsym. If it is only in the ldynsym,
* then the code above already set it up and we have
* nothing more to do here.
*/
if (enter_in_symtab && enter_in_ldynsym) {
ldynsym[ldynsym_ndx] = *sym;
(void) st_setstring(dynstr, sdp->sd_name,
&stoff);
ldynsym[ldynsym_ndx].st_name = stoff;
if (_symshndx && ldynshndx)
ldynshndx[ldynsym_ndx] = *_symshndx;
/* Add it to sort section if it qualifies */
ADD_TO_DYNSORT(sdp, sym, type, ldynsym_ndx);
ldynsym_ndx++;
}
}
/*
* If this input file has undergone object to symbol
* capabilities conversion, supply any new capabilities symbols.
* These symbols are copies of the original global symbols, and
* follow the existing local symbols that are supplied from this
* input file (which are identified with a preceding STT_FILE).
*/
if (symtab && cdp && cdp->ca_syms) {
Aliste idx2;
Cap_sym *csp;
for (APLIST_TRAVERSE(cdp->ca_syms, idx2, csp)) {
Is_desc *isp;
sdp = csp->cs_sdp;
sym = sdp->sd_sym;
if ((isp = sdp->sd_isc) != NULL) {
Os_desc *osp = isp->is_osdesc;
/*
* Update the symbols value.
*/
/* LINTED */
sym->st_value +=
(Off)_elf_getxoff(isp->is_indata);
if ((flags & FLG_OF_RELOBJ) == 0)
sym->st_value +=
osp->os_shdr->sh_addr;
/*
* Update the symbols section index.
*/
sdp->sd_shndx = sym->st_shndx =
elf_ndxscn(osp->os_scn);
}
symtab[symtab_ndx] = *sym;
(void) st_setstring(strtab, sdp->sd_name,
&stoff);
symtab[symtab_ndx].st_name = stoff;
sdp->sd_symndx = symtab_ndx++;
}
}
}
symtab_gbl_bndx = symtab_ndx; /* .symtab index of 1st global entry */
/*
* Two special symbols are `_init' and `_fini'. If these are supplied
* by crti.o then they are used to represent the total concatenation of
* the `.init' and `.fini' sections.
*
* Determine whether any .init or .fini sections exist. If these
* sections exist and a dynamic object is being built, but no `_init'
* or `_fini' symbols are found, then the user is probably building
* this object directly from ld(1) rather than using a compiler driver
* that provides the symbols via crt's.
*
* If the .init or .fini section exist, and their associated symbols,
* determine the size of the sections and updated the symbols value
* accordingly.
*/
if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_INIT_U), SYM_NOHASH, 0,
ofl)) != NULL) && (sdp->sd_ref == REF_REL_NEED) && sdp->sd_isc &&
(sdp->sd_isc->is_osdesc == iosp)) {
if (ld_sym_copy(sdp) == S_ERROR)
return ((Addr)S_ERROR);
sdp->sd_sym->st_size = sdp->sd_isc->is_osdesc->os_shdr->sh_size;
} else if (iosp && !(flags & FLG_OF_RELOBJ)) {
ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_NOCRT),
MSG_ORIG(MSG_SYM_INIT_U), MSG_ORIG(MSG_SCN_INIT));
}
if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_FINI_U), SYM_NOHASH, 0,
ofl)) != NULL) && (sdp->sd_ref == REF_REL_NEED) && sdp->sd_isc &&
(sdp->sd_isc->is_osdesc == fosp)) {
if (ld_sym_copy(sdp) == S_ERROR)
return ((Addr)S_ERROR);
sdp->sd_sym->st_size = sdp->sd_isc->is_osdesc->os_shdr->sh_size;
} else if (fosp && !(flags & FLG_OF_RELOBJ)) {
ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_NOCRT),
MSG_ORIG(MSG_SYM_FINI_U), MSG_ORIG(MSG_SCN_FINI));
}
/*
* Assign .bss information for use with updating COMMON symbols.
*/
if (ofl->ofl_isbss) {
isc = ofl->ofl_isbss;
osp = isc->is_osdesc;
bssaddr = osp->os_shdr->sh_addr +
(Off)_elf_getxoff(isc->is_indata);
/* LINTED */
bssndx = elf_ndxscn(osp->os_scn);
}
#if defined(_ELF64)
/*
* For amd64 target, assign .lbss information for use
* with updating LCOMMON symbols.
*/
if ((ld_targ.t_m.m_mach == EM_AMD64) && ofl->ofl_islbss) {
osp = ofl->ofl_islbss->is_osdesc;
lbssaddr = osp->os_shdr->sh_addr +
(Off)_elf_getxoff(ofl->ofl_islbss->is_indata);
/* LINTED */
lbssndx = elf_ndxscn(osp->os_scn);
}
#endif
/*
* Assign .tlsbss information for use with updating COMMON symbols.
*/
if (ofl->ofl_istlsbss) {
osp = ofl->ofl_istlsbss->is_osdesc;
tlsbssaddr = osp->os_shdr->sh_addr +
(Off)_elf_getxoff(ofl->ofl_istlsbss->is_indata);
/* LINTED */
tlsbssndx = elf_ndxscn(osp->os_scn);
}
if ((sorted_syms = libld_calloc(ofl->ofl_globcnt +
ofl->ofl_elimcnt + ofl->ofl_scopecnt,
sizeof (*sorted_syms))) == NULL)
return ((Addr)S_ERROR);
scndx = 0;
ssndx = ofl->ofl_scopecnt + ofl->ofl_elimcnt;
DBG_CALL(Dbg_syms_up_title(ofl->ofl_lml));
/*
* Traverse the internal symbol table updating global symbol information
* and allocating common.
*/
for (sav = avl_first(&ofl->ofl_symavl); sav;
sav = AVL_NEXT(&ofl->ofl_symavl, sav)) {
Sym *symptr;
int local;
int restore;
sdp = sav->sav_sdp;
/*
* Ignore any symbols that have been marked as invalid during
* input processing. Providing these aren't used for
* relocation, they will be dropped from the output image.
*/
if (sdp->sd_flags & FLG_SY_INVALID) {
DBG_CALL(Dbg_syms_old(ofl, sdp));
DBG_CALL(Dbg_syms_ignore(ofl, sdp));
continue;
}
/*
* Only needed symbols are copied to the output symbol table.
*/
if (sdp->sd_ref == REF_DYN_SEEN)
continue;
if (ld_sym_reducable(ofl, sdp))
local = 1;
else
local = 0;
if (local || (ofl->ofl_hashbkts == 0)) {
sorted_syms[scndx++].sl_sdp = sdp;
} else {
sorted_syms[ssndx].sl_hval = sdp->sd_aux->sa_hash %
ofl->ofl_hashbkts;
sorted_syms[ssndx].sl_sdp = sdp;
ssndx++;
}
/*
* Note - expand the COMMON symbols here because an address
* must be assigned to them in the same order that space was
* calculated in sym_validate(). If this ordering isn't
* followed differing alignment requirements can throw us all
* out of whack.
*
* The expanded .bss global symbol is handled here as well.
*
* The actual adding entries into the symbol table still occurs
* below in hashbucket order.
*/
symptr = sdp->sd_sym;
restore = 0;
if ((sdp->sd_flags & FLG_SY_PAREXPN) ||
((sdp->sd_flags & FLG_SY_SPECSEC) &&
(sdp->sd_shndx = symptr->st_shndx) == SHN_COMMON)) {
/*
* An expanded symbol goes to a special .data section
* prepared for that purpose (ofl->ofl_isparexpn).
* Assign COMMON allocations to .bss.
* Otherwise leave it as is.
*/
if (sdp->sd_flags & FLG_SY_PAREXPN) {
restore = 1;
sdp->sd_shndx = parexpnndx;
sdp->sd_flags &= ~FLG_SY_SPECSEC;
symptr->st_value = (Xword) S_ROUND(
parexpnaddr, symptr->st_value);
parexpnaddr = symptr->st_value +
symptr->st_size;
sdp->sd_isc = ofl->ofl_isparexpn;
sdp->sd_flags |= FLG_SY_COMMEXP;
} else if (ELF_ST_TYPE(symptr->st_info) != STT_TLS &&
(local || !(flags & FLG_OF_RELOBJ))) {
restore = 1;
sdp->sd_shndx = bssndx;
sdp->sd_flags &= ~FLG_SY_SPECSEC;
symptr->st_value = (Xword)S_ROUND(bssaddr,
symptr->st_value);
bssaddr = symptr->st_value + symptr->st_size;
sdp->sd_isc = ofl->ofl_isbss;
sdp->sd_flags |= FLG_SY_COMMEXP;
} else if (ELF_ST_TYPE(symptr->st_info) == STT_TLS &&
(local || !(flags & FLG_OF_RELOBJ))) {
restore = 1;
sdp->sd_shndx = tlsbssndx;
sdp->sd_flags &= ~FLG_SY_SPECSEC;
symptr->st_value = (Xword)S_ROUND(tlsbssaddr,
symptr->st_value);
tlsbssaddr = symptr->st_value + symptr->st_size;
sdp->sd_isc = ofl->ofl_istlsbss;
sdp->sd_flags |= FLG_SY_COMMEXP;
/*
* TLS symbols are relative to the TLS segment.
*/
symptr->st_value -= ofl->ofl_tlsphdr->p_vaddr;
}
#if defined(_ELF64)
} else if ((ld_targ.t_m.m_mach == EM_AMD64) &&
(sdp->sd_flags & FLG_SY_SPECSEC) &&
((sdp->sd_shndx = symptr->st_shndx) ==
SHN_X86_64_LCOMMON) &&
((local || !(flags & FLG_OF_RELOBJ)))) {
restore = 1;
sdp->sd_shndx = lbssndx;
sdp->sd_flags &= ~FLG_SY_SPECSEC;
symptr->st_value = (Xword)S_ROUND(lbssaddr,
symptr->st_value);
lbssaddr = symptr->st_value + symptr->st_size;
sdp->sd_isc = ofl->ofl_islbss;
sdp->sd_flags |= FLG_SY_COMMEXP;
#endif
}
if (restore != 0) {
uchar_t type, bind;
/*
* Make sure this COMMON symbol is returned to the same
* binding as was defined in the original relocatable
* object reference.
*/
type = ELF_ST_TYPE(symptr->st_info);
if (sdp->sd_flags & FLG_SY_GLOBREF)
bind = STB_GLOBAL;
else
bind = STB_WEAK;
symptr->st_info = ELF_ST_INFO(bind, type);
}
}
/*
* If this is a dynamic object then add any local capabilities symbols.
*/
if (dynsym && ofl->ofl_capfamilies) {
Cap_avlnode *cav;
for (cav = avl_first(ofl->ofl_capfamilies); cav;
cav = AVL_NEXT(ofl->ofl_capfamilies, cav)) {
Cap_sym *csp;
Aliste idx;
for (APLIST_TRAVERSE(cav->cn_members, idx, csp)) {
sdp = csp->cs_sdp;
DBG_CALL(Dbg_syms_created(ofl->ofl_lml,
sdp->sd_name));
DBG_CALL(Dbg_syms_entered(ofl, sdp->sd_sym,
sdp));
dynsym[dynsym_ndx] = *sdp->sd_sym;
(void) st_setstring(dynstr, sdp->sd_name,
&stoff);
dynsym[dynsym_ndx].st_name = stoff;
sdp->sd_sym = &dynsym[dynsym_ndx];
sdp->sd_symndx = dynsym_ndx;
/*
* Indicate that this is a capabilities symbol.
* Note, that this identification only provides
* information regarding the symbol that is
* visible from elfdump(1) -y. The association
* of a symbol to its capabilities is derived
* from a .SUNW_capinfo entry.
*/
if (syminfo) {
syminfo[dynsym_ndx].si_flags |=
SYMINFO_FLG_CAP;
}
dynsym_ndx++;
}
}
}
if (ofl->ofl_hashbkts) {
qsort(sorted_syms + ofl->ofl_scopecnt + ofl->ofl_elimcnt,
ofl->ofl_globcnt, sizeof (Sym_s_list),
(int (*)(const void *, const void *))sym_hash_compare);
}
for (ssndx = 0; ssndx < (ofl->ofl_elimcnt + ofl->ofl_scopecnt +
ofl->ofl_globcnt); ssndx++) {
const char *name;
Sym *sym;
Sym_aux *sap;
Half spec;
int local = 0, dynlocal = 0, enter_in_symtab;
Gotndx *gnp;
Word sectndx;
sdp = sorted_syms[ssndx].sl_sdp;
sectndx = 0;
if (symtab)
enter_in_symtab = 1;
else
enter_in_symtab = 0;
/*
* Assign a got offset if necessary.
*/
if ((ld_targ.t_mr.mr_assign_got != NULL) &&
(*ld_targ.t_mr.mr_assign_got)(ofl, sdp) == S_ERROR)
return ((Addr)S_ERROR);
if (DBG_ENABLED) {
Aliste idx2;
for (ALIST_TRAVERSE(sdp->sd_GOTndxs, idx2, gnp)) {
gottable->gt_sym = sdp;
gottable->gt_gndx.gn_gotndx = gnp->gn_gotndx;
gottable->gt_gndx.gn_addend = gnp->gn_addend;
gottable++;
}
if (sdp->sd_aux && sdp->sd_aux->sa_PLTGOTndx) {
gottable->gt_sym = sdp;
gottable->gt_gndx.gn_gotndx =
sdp->sd_aux->sa_PLTGOTndx;
gottable++;
}
}
/*
* If this symbol has been marked as being reduced to local
* scope then it will have to be placed in the scoped portion
* of the .symtab. Retain the appropriate index for use in
* version symbol indexing and relocation.
*/
if (ld_sym_reducable(ofl, sdp)) {
local = 1;
if (!(sdp->sd_flags & FLG_SY_ELIM) && !dynsym)
sdp->sd_symndx = scopesym_ndx;
else
sdp->sd_symndx = 0;
if (sdp->sd_flags & FLG_SY_ELIM) {
enter_in_symtab = 0;
} else if (ldynsym && sdp->sd_sym->st_name &&
ldynsym_symtype[
ELF_ST_TYPE(sdp->sd_sym->st_info)]) {
dynlocal = 1;
}
} else {
sdp->sd_symndx = *symndx;
}
/*
* Copy basic symbol and string information.
*/
name = sdp->sd_name;
sap = sdp->sd_aux;
/*
* If we require to record version symbol indexes, update the
* associated version symbol information for all defined
* symbols. If a version definition is required any zero value
* symbol indexes would have been flagged as undefined symbol
* errors, however if we're just scoping these need to fall into
* the base of global symbols.
*/
if (sdp->sd_symndx && versym) {
Half vndx = 0;
if (sdp->sd_flags & FLG_SY_MVTOCOMM) {
vndx = VER_NDX_GLOBAL;
} else if (sdp->sd_ref == REF_REL_NEED) {
vndx = sap->sa_overndx;
if ((vndx == 0) &&
(sdp->sd_sym->st_shndx != SHN_UNDEF)) {
if (SYM_IS_HIDDEN(sdp))
vndx = VER_NDX_LOCAL;
else
vndx = VER_NDX_GLOBAL;
}
} else if ((sdp->sd_ref == REF_DYN_NEED) &&
(sap->sa_dverndx > 0) &&
(sap->sa_dverndx <= sdp->sd_file->ifl_vercnt) &&
(sdp->sd_file->ifl_verndx != NULL)) {
/* Use index of verneed record */
vndx = sdp->sd_file->ifl_verndx
[sap->sa_dverndx].vi_overndx;
}
versym[sdp->sd_symndx] = vndx;
}
/*
* If we are creating the .syminfo section then set per symbol
* flags here.
*/
if (sdp->sd_symndx && syminfo &&
!(sdp->sd_flags & FLG_SY_NOTAVAIL)) {
int ndx = sdp->sd_symndx;
APlist **alpp = &(ofl->ofl_symdtent);
if (sdp->sd_flags & FLG_SY_MVTOCOMM)
/*
* Identify a copy relocation symbol.
*/
syminfo[ndx].si_flags |= SYMINFO_FLG_COPY;
if (sdp->sd_ref == REF_DYN_NEED) {
/*
* A reference is bound to a needed dependency.
* Save the syminfo entry, so that when the
* .dynamic section has been updated, a
* DT_NEEDED entry can be associated
* (see update_osyminfo()).
*/
if (aplist_append(alpp, sdp,
AL_CNT_OFL_SYMINFOSYMS) == NULL)
return (0);
/*
* Flag that the symbol has a direct association
* with the external reference (this is an old
* tagging, that has no real effect by itself).
*/
syminfo[ndx].si_flags |= SYMINFO_FLG_DIRECT;
/*
* Flag any lazy or deferred reference.
*/
if (sdp->sd_flags & FLG_SY_LAZYLD)
syminfo[ndx].si_flags |=
SYMINFO_FLG_LAZYLOAD;
if (sdp->sd_flags & FLG_SY_DEFERRED)
syminfo[ndx].si_flags |=
SYMINFO_FLG_DEFERRED;
/*
* Enable direct symbol bindings if:
*
* - Symbol was identified with the DIRECT
* keyword in a mapfile.
*
* - Symbol reference has been bound to a
* dependency which was specified as
* requiring direct bindings with -zdirect.
*
* - All symbol references are required to
* use direct bindings via -Bdirect.
*/
if (sdp->sd_flags & FLG_SY_DIR)
syminfo[ndx].si_flags |=
SYMINFO_FLG_DIRECTBIND;
} else if ((sdp->sd_flags & FLG_SY_EXTERN) &&
(sdp->sd_sym->st_shndx == SHN_UNDEF)) {
/*
* If this symbol has been explicitly defined
* as external, and remains unresolved, mark
* it as external.
*/
syminfo[ndx].si_boundto = SYMINFO_BT_EXTERN;
} else if ((sdp->sd_flags & FLG_SY_PARENT) &&
(sdp->sd_sym->st_shndx == SHN_UNDEF)) {
/*
* If this symbol has been explicitly defined
* to be a reference to a parent object,
* indicate whether a direct binding should be
* established.
*/
syminfo[ndx].si_flags |= SYMINFO_FLG_DIRECT;
syminfo[ndx].si_boundto = SYMINFO_BT_PARENT;
if (sdp->sd_flags & FLG_SY_DIR)
syminfo[ndx].si_flags |=
SYMINFO_FLG_DIRECTBIND;
} else if (sdp->sd_flags & FLG_SY_STDFLTR) {
/*
* A filter definition. Although this symbol
* can only be a stub, it might be necessary to
* prevent external direct bindings.
*/
syminfo[ndx].si_flags |= SYMINFO_FLG_FILTER;
if (sdp->sd_flags & FLG_SY_NDIR)
syminfo[ndx].si_flags |=
SYMINFO_FLG_NOEXTDIRECT;
} else if (sdp->sd_flags & FLG_SY_AUXFLTR) {
/*
* An auxiliary filter definition. By nature,
* this definition is direct, in that should the
* filtee lookup fail, we'll fall back to this
* object. It may still be necessary to
* prevent external direct bindings.
*/
syminfo[ndx].si_flags |= SYMINFO_FLG_AUXILIARY;
if (sdp->sd_flags & FLG_SY_NDIR)
syminfo[ndx].si_flags |=
SYMINFO_FLG_NOEXTDIRECT;
} else if ((sdp->sd_ref == REF_REL_NEED) &&
(sdp->sd_sym->st_shndx != SHN_UNDEF)) {
/*
* This definition exists within the object
* being created. Provide a default boundto
* definition, which may be overridden later.
*/
syminfo[ndx].si_boundto = SYMINFO_BT_NONE;
/*
* Indicate whether it is necessary to prevent
* external direct bindings.
*/
if (sdp->sd_flags & FLG_SY_NDIR) {
syminfo[ndx].si_flags |=
SYMINFO_FLG_NOEXTDIRECT;
}
/*
* Indicate that this symbol is acting as an
* individual interposer.
*/
if (sdp->sd_flags & FLG_SY_INTPOSE) {
syminfo[ndx].si_flags |=
SYMINFO_FLG_INTERPOSE;
}
/*
* Indicate that this symbol is deferred, and
* hence should not be bound to during BIND_NOW
* relocations.
*/
if (sdp->sd_flags & FLG_SY_DEFERRED) {
syminfo[ndx].si_flags |=
SYMINFO_FLG_DEFERRED;
}
/*
* If external bindings are allowed, indicate
* the binding, and a direct binding if
* necessary.
*/
if ((sdp->sd_flags & FLG_SY_NDIR) == 0) {
syminfo[ndx].si_flags |=
SYMINFO_FLG_DIRECT;
if (sdp->sd_flags & FLG_SY_DIR)
syminfo[ndx].si_flags |=
SYMINFO_FLG_DIRECTBIND;
/*
* Provide a default boundto definition,
* which may be overridden later.
*/
syminfo[ndx].si_boundto =
SYMINFO_BT_SELF;
}
/*
* Indicate that this is a capabilities symbol.
* Note, that this identification only provides
* information regarding the symbol that is
* visible from elfdump(1) -y. The association
* of a symbol to its capabilities is derived
* from a .SUNW_capinfo entry.
*/
if ((sdp->sd_flags & FLG_SY_CAP) &&
ofl->ofl_oscapinfo) {
syminfo[ndx].si_flags |=
SYMINFO_FLG_CAP;
}
}
}
/*
* Note that the `sym' value is reset to be one of the new
* symbol table entries. This symbol will be updated further
* depending on the type of the symbol. Process the .symtab
* first, followed by the .dynsym, thus the `sym' value will
* remain as the .dynsym value when the .dynsym is present.
* This ensures that any versioning symbols st_name value will
* be appropriate for the string table used by version
* entries.
*/
if (enter_in_symtab) {
Word _symndx;
if (local)
_symndx = scopesym_ndx;
else
_symndx = symtab_ndx;
symtab[_symndx] = *sdp->sd_sym;
sdp->sd_sym = sym = &symtab[_symndx];
(void) st_setstring(strtab, name, &stoff);
sym->st_name = stoff;
}
if (dynlocal) {
ldynsym[ldynscopesym_ndx] = *sdp->sd_sym;
sdp->sd_sym = sym = &ldynsym[ldynscopesym_ndx];
(void) st_setstring(dynstr, name, &stoff);
ldynsym[ldynscopesym_ndx].st_name = stoff;
/* Add it to sort section if it qualifies */
ADD_TO_DYNSORT(sdp, sym, ELF_ST_TYPE(sym->st_info),
ldynscopesym_ndx);
}
if (dynsym && !local) {
dynsym[dynsym_ndx] = *sdp->sd_sym;
/*
* Provided this isn't an unnamed register symbol,
* update the symbols name and hash value.
*/
if (((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
dynsym[dynsym_ndx].st_name) {
(void) st_setstring(dynstr, name, &stoff);
dynsym[dynsym_ndx].st_name = stoff;
if (stoff) {
Word hashval, _hashndx;
hashval =
sap->sa_hash % ofl->ofl_hashbkts;
/* LINTED */
if (_hashndx = hashbkt[hashval]) {
while (hashchain[_hashndx]) {
_hashndx =
hashchain[_hashndx];
}
hashchain[_hashndx] =
sdp->sd_symndx;
} else {
hashbkt[hashval] =
sdp->sd_symndx;
}
}
}
sdp->sd_sym = sym = &dynsym[dynsym_ndx];
/*
* Add it to sort section if it qualifies.
* The indexes in that section are relative to the
* the adjacent SUNW_ldynsym/dymsym pair, so we
* add the number of items in SUNW_ldynsym to the
* dynsym index.
*/
ADD_TO_DYNSORT(sdp, sym, ELF_ST_TYPE(sym->st_info),
ldynsym_cnt + dynsym_ndx);
}
if (!enter_in_symtab && (!dynsym || (local && !dynlocal))) {
if (!(sdp->sd_flags & FLG_SY_UPREQD))
continue;
sym = sdp->sd_sym;
} else
sdp->sd_flags &= ~FLG_SY_CLEAN;
/*
* If we have a weak data symbol for which we need the real
* symbol also, save this processing until later.
*
* The exception to this is if the weak/strong have PLT's
* assigned to them. In that case we don't do the post-weak
* processing because the PLT's must be maintained so that we
* can do 'interpositioning' on both of the symbols.
*/
if ((sap->sa_linkndx) &&
(ELF_ST_BIND(sym->st_info) == STB_WEAK) &&
(!sap->sa_PLTndx)) {
Sym_desc *_sdp;
_sdp = sdp->sd_file->ifl_oldndx[sap->sa_linkndx];
if (_sdp->sd_ref != REF_DYN_SEEN) {
Wk_desc wk;
if (enter_in_symtab) {
if (local) {
wk.wk_symtab =
&symtab[scopesym_ndx];
scopesym_ndx++;
} else {
wk.wk_symtab =
&symtab[symtab_ndx];
symtab_ndx++;
}
} else {
wk.wk_symtab = NULL;
}
if (dynsym) {
if (!local) {
wk.wk_dynsym =
&dynsym[dynsym_ndx];
dynsym_ndx++;
} else if (dynlocal) {
wk.wk_dynsym =
&ldynsym[ldynscopesym_ndx];
ldynscopesym_ndx++;
}
} else {
wk.wk_dynsym = NULL;
}
wk.wk_weak = sdp;
wk.wk_alias = _sdp;
if (alist_append(&weak, &wk,
sizeof (Wk_desc), AL_CNT_WEAK) == NULL)
return ((Addr)S_ERROR);
continue;
}
}
DBG_CALL(Dbg_syms_old(ofl, sdp));
spec = 0;
/*
* assign new symbol value.
*/
sectndx = sdp->sd_shndx;
if (sectndx == SHN_UNDEF) {
if (((sdp->sd_flags & FLG_SY_REGSYM) == 0) &&
(sym->st_value != 0)) {
ld_eprintf(ofl, ERR_WARNING,
MSG_INTL(MSG_SYM_NOTNULL),
demangle(name), sdp->sd_file->ifl_name);
}
/*
* Undefined weak global, if we are generating a static
* executable, output as an absolute zero. Otherwise
* leave it as is, ld.so.1 will skip symbols of this
* type (this technique allows applications and
* libraries to test for the existence of a symbol as an
* indication of the presence or absence of certain
* functionality).
*/
if (OFL_IS_STATIC_EXEC(ofl) &&
(ELF_ST_BIND(sym->st_info) == STB_WEAK)) {
sdp->sd_flags |= FLG_SY_SPECSEC;
sdp->sd_shndx = sectndx = SHN_ABS;
}
} else if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
(sectndx == SHN_COMMON)) {
/* COMMONs have already been processed */
/* EMPTY */
;
} else {
if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
(sectndx == SHN_ABS))
spec = sdp->sd_aux->sa_symspec;
/* LINTED */
if (sdp->sd_flags & FLG_SY_COMMEXP) {
/*
* This is (or was) a COMMON symbol which was
* processed above - no processing
* required here.
*/
;
} else if (sdp->sd_ref == REF_DYN_NEED) {
uchar_t type, bind;
sectndx = SHN_UNDEF;
sym->st_value = 0;
sym->st_size = 0;
/*
* Make sure this undefined symbol is returned
* to the same binding as was defined in the
* original relocatable object reference.
*/
type = ELF_ST_TYPE(sym-> st_info);
if (sdp->sd_flags & FLG_SY_GLOBREF)
bind = STB_GLOBAL;
else
bind = STB_WEAK;
sym->st_info = ELF_ST_INFO(bind, type);
} else if (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) &&
(sdp->sd_ref == REF_REL_NEED)) {
osp = sdp->sd_isc->is_osdesc;
/* LINTED */
sectndx = elf_ndxscn(osp->os_scn);
/*
* In an executable, the new symbol value is the
* old value (offset into defining section) plus
* virtual address of defining section. In a
* relocatable, the new value is the old value
* plus the displacement of the section within
* the file.
*/
/* LINTED */
sym->st_value +=
(Off)_elf_getxoff(sdp->sd_isc->is_indata);
if (!(flags & FLG_OF_RELOBJ)) {
sym->st_value += osp->os_shdr->sh_addr;
/*
* TLS symbols are relative to
* the TLS segment.
*/
if ((ELF_ST_TYPE(sym->st_info) ==
STT_TLS) && (ofl->ofl_tlsphdr))
sym->st_value -=
ofl->ofl_tlsphdr->p_vaddr;
}
}
}
if (spec) {
switch (spec) {
case SDAUX_ID_ETEXT:
sym->st_value = etext;
sectndx = etext_ndx;
if (etext_abs)
sdp->sd_flags |= FLG_SY_SPECSEC;
else
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
case SDAUX_ID_EDATA:
sym->st_value = edata;
sectndx = edata_ndx;
if (edata_abs)
sdp->sd_flags |= FLG_SY_SPECSEC;
else
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
case SDAUX_ID_END:
sym->st_value = end;
sectndx = end_ndx;
if (end_abs)
sdp->sd_flags |= FLG_SY_SPECSEC;
else
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
case SDAUX_ID_START:
sym->st_value = start;
sectndx = start_ndx;
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
case SDAUX_ID_DYN:
if (flags & FLG_OF_DYNAMIC) {
sym->st_value = ofl->
ofl_osdynamic->os_shdr->sh_addr;
/* LINTED */
sectndx = elf_ndxscn(
ofl->ofl_osdynamic->os_scn);
sdp->sd_flags &= ~FLG_SY_SPECSEC;
}
break;
case SDAUX_ID_PLT:
if (ofl->ofl_osplt) {
sym->st_value = ofl->
ofl_osplt->os_shdr->sh_addr;
/* LINTED */
sectndx = elf_ndxscn(
ofl->ofl_osplt->os_scn);
sdp->sd_flags &= ~FLG_SY_SPECSEC;
}
break;
case SDAUX_ID_GOT:
/*
* Symbol bias for negative growing tables is
* stored in symbol's value during
* allocate_got().
*/
sym->st_value += ofl->
ofl_osgot->os_shdr->sh_addr;
/* LINTED */
sectndx = elf_ndxscn(ofl->
ofl_osgot->os_scn);
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
case SDAUX_ID_SECBOUND_START:
sym->st_value = sap->sa_boundsec->
os_shdr->sh_addr;
sectndx = elf_ndxscn(sap->sa_boundsec->os_scn);
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
case SDAUX_ID_SECBOUND_STOP:
sym->st_value = sap->sa_boundsec->
os_shdr->sh_addr +
sap->sa_boundsec->os_shdr->sh_size;
sectndx = elf_ndxscn(sap->sa_boundsec->os_scn);
sdp->sd_flags &= ~FLG_SY_SPECSEC;
break;
default:
/* NOTHING */
;
}
}
/*
* If a plt index has been assigned to an undefined function,
* update the symbols value to the appropriate .plt address.
*/
if ((flags & FLG_OF_DYNAMIC) && (flags & FLG_OF_EXEC) &&
(sdp->sd_file) &&
(sdp->sd_file->ifl_ehdr->e_type == ET_DYN) &&
(ELF_ST_TYPE(sym->st_info) == STT_FUNC) &&
!(flags & FLG_OF_BFLAG)) {
if (sap->sa_PLTndx)
sym->st_value =
(*ld_targ.t_mr.mr_calc_plt_addr)(sdp, ofl);
}
/*
* Finish updating the symbols.
*/
/*
* Sym Update: if scoped local - set local binding
*/
if (local)
sym->st_info = ELF_ST_INFO(STB_LOCAL,
ELF_ST_TYPE(sym->st_info));
/*
* Sym Updated: If both the .symtab and .dynsym
* are present then we've actually updated the information in
* the .dynsym, therefore copy this same information to the
* .symtab entry.
*/
sdp->sd_shndx = sectndx;
if (enter_in_symtab && dynsym && (!local || dynlocal)) {
Word _symndx = dynlocal ? scopesym_ndx : symtab_ndx;
symtab[_symndx].st_value = sym->st_value;
symtab[_symndx].st_size = sym->st_size;
symtab[_symndx].st_info = sym->st_info;
symtab[_symndx].st_other = sym->st_other;
}
if (enter_in_symtab) {
Word _symndx;
if (local)
_symndx = scopesym_ndx++;
else
_symndx = symtab_ndx++;
if (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) &&
(sectndx >= SHN_LORESERVE)) {
assert(symshndx != NULL);
symshndx[_symndx] = sectndx;
symtab[_symndx].st_shndx = SHN_XINDEX;
} else {
/* LINTED */
symtab[_symndx].st_shndx = (Half)sectndx;
}
}
if (dynsym && (!local || dynlocal)) {
/*
* dynsym and ldynsym are distinct tables, so
* we use indirection to access the right one
* and the related extended section index array.
*/
Word _symndx;
Sym *_dynsym;
Word *_dynshndx;
if (!local) {
_symndx = dynsym_ndx++;
_dynsym = dynsym;
_dynshndx = dynshndx;
} else {
_symndx = ldynscopesym_ndx++;
_dynsym = ldynsym;
_dynshndx = ldynshndx;
}
if (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) &&
(sectndx >= SHN_LORESERVE)) {
assert(_dynshndx != NULL);
_dynshndx[_symndx] = sectndx;
_dynsym[_symndx].st_shndx = SHN_XINDEX;
} else {
/* LINTED */
_dynsym[_symndx].st_shndx = (Half)sectndx;
}
}
DBG_CALL(Dbg_syms_new(ofl, sym, sdp));
}
/*
* Now that all the symbols have been processed update any weak symbols
* information (ie. copy all information except `st_name'). As both
* symbols will be represented in the output, return the weak symbol to
* its correct type.
*/
for (ALIST_TRAVERSE(weak, idx1, wkp)) {
Sym_desc *sdp, *_sdp;
Sym *sym, *_sym, *__sym;
uchar_t bind;
sdp = wkp->wk_weak;
_sdp = wkp->wk_alias;
_sym = __sym = _sdp->sd_sym;
sdp->sd_flags |= FLG_SY_WEAKDEF;
/*
* If the symbol definition has been scoped then assign it to
* be local, otherwise if it's from a shared object then we need
* to maintain the binding of the original reference.
*/
if (SYM_IS_HIDDEN(sdp)) {
if (ld_sym_reducable(ofl, sdp))
bind = STB_LOCAL;
else
bind = STB_WEAK;
} else if ((sdp->sd_ref == REF_DYN_NEED) &&
(sdp->sd_flags & FLG_SY_GLOBREF))
bind = STB_GLOBAL;
else
bind = STB_WEAK;
DBG_CALL(Dbg_syms_old(ofl, sdp));
if ((sym = wkp->wk_symtab) != NULL) {
sym->st_value = _sym->st_value;
sym->st_size = _sym->st_size;
sym->st_other = _sym->st_other;
sym->st_shndx = _sym->st_shndx;
sym->st_info = ELF_ST_INFO(bind,
ELF_ST_TYPE(sym->st_info));
__sym = sym;
}
if ((sym = wkp->wk_dynsym) != NULL) {
sym->st_value = _sym->st_value;
sym->st_size = _sym->st_size;
sym->st_other = _sym->st_other;
sym->st_shndx = _sym->st_shndx;
sym->st_info = ELF_ST_INFO(bind,
ELF_ST_TYPE(sym->st_info));
__sym = sym;
}
DBG_CALL(Dbg_syms_new(ofl, __sym, sdp));
}
/*
* Now display GOT debugging information if required.
*/
DBG_CALL(Dbg_got_display(ofl, 0, 0,
ld_targ.t_m.m_got_xnumber, ld_targ.t_m.m_got_entsize));
/*
* Update the section headers information. sh_info is
* supposed to contain the offset at which the first
* global symbol resides in the symbol table, while
* sh_link contains the section index of the associated
* string table.
*/
if (symtab) {
Shdr *shdr = ofl->ofl_ossymtab->os_shdr;
shdr->sh_info = symtab_gbl_bndx;
/* LINTED */
shdr->sh_link = (Word)elf_ndxscn(ofl->ofl_osstrtab->os_scn);
if (symshndx)
ofl->ofl_ossymshndx->os_shdr->sh_link =
(Word)elf_ndxscn(ofl->ofl_ossymtab->os_scn);
/*
* Ensure that the expected number of symbols
* were entered into the right spots:
* - Scoped symbols in the right range
* - Globals start at the right spot
* (correct number of locals entered)
* - The table is exactly filled
* (correct number of globals entered)
*/
assert((scopesym_bndx + ofl->ofl_scopecnt) == scopesym_ndx);
assert(shdr->sh_info == SYMTAB_LOC_CNT(ofl));
assert((shdr->sh_info + ofl->ofl_globcnt) == symtab_ndx);
}
if (dynsym) {
Shdr *shdr = ofl->ofl_osdynsym->os_shdr;
shdr->sh_info = DYNSYM_LOC_CNT(ofl);
/* LINTED */
shdr->sh_link = (Word)elf_ndxscn(ofl->ofl_osdynstr->os_scn);
ofl->ofl_oshash->os_shdr->sh_link =
/* LINTED */
(Word)elf_ndxscn(ofl->ofl_osdynsym->os_scn);
if (dynshndx) {
shdr = ofl->ofl_osdynshndx->os_shdr;
shdr->sh_link =
(Word)elf_ndxscn(ofl->ofl_osdynsym->os_scn);
}
}
if (ldynsym) {
Shdr *shdr = ofl->ofl_osldynsym->os_shdr;
/* ldynsym has no globals, so give index one past the end */
shdr->sh_info = ldynsym_ndx;
/*
* The ldynsym and dynsym must be adjacent. The
* idea is that rtld should be able to start with
* the ldynsym and march straight through the end
* of dynsym, seeing them as a single symbol table,
* despite the fact that they are in distinct sections.
* Ensure that this happened correctly.
*
* Note that I use ldynsym_ndx here instead of the
* computation I used to set the section size
* (found in ldynsym_cnt). The two will agree, unless
* we somehow miscounted symbols or failed to insert them
* all. Using ldynsym_ndx here catches that error in
* addition to checking for adjacency.
*/
assert(dynsym == (ldynsym + ldynsym_ndx));
/* LINTED */
shdr->sh_link = (Word)elf_ndxscn(ofl->ofl_osdynstr->os_scn);
if (ldynshndx) {
shdr = ofl->ofl_osldynshndx->os_shdr;
shdr->sh_link =
(Word)elf_ndxscn(ofl->ofl_osldynsym->os_scn);
}
/*
* The presence of .SUNW_ldynsym means that there may be
* associated sort sections, one for regular symbols
* and the other for TLS. Each sort section needs the
* following done:
* - Section header link references .SUNW_ldynsym
* - Should have received the expected # of items
* - Sorted by increasing address
*/
if (ofl->ofl_osdynsymsort) { /* .SUNW_dynsymsort */
ofl->ofl_osdynsymsort->os_shdr->sh_link =
(Word)elf_ndxscn(ofl->ofl_osldynsym->os_scn);
assert(ofl->ofl_dynsymsortcnt == dynsymsort_ndx);
if (dynsymsort_ndx > 1) {
dynsort_compare_syms = ldynsym;
qsort(dynsymsort, dynsymsort_ndx,
sizeof (*dynsymsort), dynsort_compare);
dynsort_dupwarn(ofl, ldynsym,
st_getstrbuf(dynstr),
dynsymsort, dynsymsort_ndx,
MSG_ORIG(MSG_SCN_DYNSYMSORT));
}
}
if (ofl->ofl_osdyntlssort) { /* .SUNW_dyntlssort */
ofl->ofl_osdyntlssort->os_shdr->sh_link =
(Word)elf_ndxscn(ofl->ofl_osldynsym->os_scn);
assert(ofl->ofl_dyntlssortcnt == dyntlssort_ndx);
if (dyntlssort_ndx > 1) {
dynsort_compare_syms = ldynsym;
qsort(dyntlssort, dyntlssort_ndx,
sizeof (*dyntlssort), dynsort_compare);
dynsort_dupwarn(ofl, ldynsym,
st_getstrbuf(dynstr),
dyntlssort, dyntlssort_ndx,
MSG_ORIG(MSG_SCN_DYNTLSSORT));
}
}
}
/*
* Used by ld.so.1 only.
*/
return (etext);
#undef ADD_TO_DYNSORT
}
/*
* Build the dynamic section.
*
* This routine must be maintained in parallel with make_dynamic()
* in sections.c
*/
static int
update_odynamic(Ofl_desc *ofl)
{
Aliste idx;
Ifl_desc *ifl;
Sym_desc *sdp;
Shdr *shdr;
Dyn *_dyn = (Dyn *)ofl->ofl_osdynamic->os_outdata->d_buf;
Dyn *dyn;
Os_desc *symosp, *strosp;
Str_tbl *strtbl;
size_t stoff;
ofl_flag_t flags = ofl->ofl_flags;
int not_relobj = !(flags & FLG_OF_RELOBJ);
Word cnt;
/*
* Relocatable objects can be built with -r and -dy to trigger the
* creation of a .dynamic section. This model is used to create kernel
* device drivers. The .dynamic section provides a subset of userland
* .dynamic entries, typically entries such as DT_NEEDED and DT_RUNPATH.
*
* Within a dynamic object, any .dynamic string references are to the
* .dynstr table. Within a relocatable object, these strings can reside
* within the .strtab.
*/
if (OFL_IS_STATIC_OBJ(ofl)) {
symosp = ofl->ofl_ossymtab;
strosp = ofl->ofl_osstrtab;
strtbl = ofl->ofl_strtab;
} else {
symosp = ofl->ofl_osdynsym;
strosp = ofl->ofl_osdynstr;
strtbl = ofl->ofl_dynstrtab;
}
/* LINTED */
ofl->ofl_osdynamic->os_shdr->sh_link = (Word)elf_ndxscn(strosp->os_scn);
dyn = _dyn;
for (APLIST_TRAVERSE(ofl->ofl_sos, idx, ifl)) {
if ((ifl->ifl_flags &
(FLG_IF_IGNORE | FLG_IF_DEPREQD)) == FLG_IF_IGNORE)
continue;
/*
* Create and set up the DT_POSFLAG_1 entry here if required.
*/
if ((ifl->ifl_flags & MSK_IF_POSFLAG1) &&
(ifl->ifl_flags & FLG_IF_NEEDED) && not_relobj) {
dyn->d_tag = DT_POSFLAG_1;
if (ifl->ifl_flags & FLG_IF_LAZYLD)
dyn->d_un.d_val = DF_P1_LAZYLOAD;
if (ifl->ifl_flags & FLG_IF_GRPPRM)
dyn->d_un.d_val |= DF_P1_GROUPPERM;
if (ifl->ifl_flags & FLG_IF_DEFERRED)
dyn->d_un.d_val |= DF_P1_DEFERRED;
dyn++;
}
if (ifl->ifl_flags & (FLG_IF_NEEDED | FLG_IF_NEEDSTR))
dyn->d_tag = DT_NEEDED;
else
continue;
(void) st_setstring(strtbl, ifl->ifl_soname, &stoff);
dyn->d_un.d_val = stoff;
/* LINTED */
ifl->ifl_neededndx = (Half)(((uintptr_t)dyn - (uintptr_t)_dyn) /
sizeof (Dyn));
dyn++;
}
if (not_relobj) {
if (ofl->ofl_dtsfltrs != NULL) {
Dfltr_desc *dftp;
for (ALIST_TRAVERSE(ofl->ofl_dtsfltrs, idx, dftp)) {
if (dftp->dft_flag == FLG_SY_AUXFLTR)
dyn->d_tag = DT_SUNW_AUXILIARY;
else
dyn->d_tag = DT_SUNW_FILTER;
(void) st_setstring(strtbl, dftp->dft_str,
&stoff);
dyn->d_un.d_val = stoff;
dftp->dft_ndx = (Half)(((uintptr_t)dyn -
(uintptr_t)_dyn) / sizeof (Dyn));
dyn++;
}
}
if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_INIT_U),
SYM_NOHASH, 0, ofl)) != NULL) &&
(sdp->sd_ref == REF_REL_NEED) &&
(sdp->sd_sym->st_shndx != SHN_UNDEF)) {
dyn->d_tag = DT_INIT;
dyn->d_un.d_ptr = sdp->sd_sym->st_value;
dyn++;
}
if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_FINI_U),
SYM_NOHASH, 0, ofl)) != NULL) &&
(sdp->sd_ref == REF_REL_NEED) &&
(sdp->sd_sym->st_shndx != SHN_UNDEF)) {
dyn->d_tag = DT_FINI;
dyn->d_un.d_ptr = sdp->sd_sym->st_value;
dyn++;
}
if (ofl->ofl_soname) {
dyn->d_tag = DT_SONAME;
(void) st_setstring(strtbl, ofl->ofl_soname, &stoff);
dyn->d_un.d_val = stoff;
dyn++;
}
if (ofl->ofl_filtees) {
if (flags & FLG_OF_AUX) {
dyn->d_tag = DT_AUXILIARY;
} else {
dyn->d_tag = DT_FILTER;
}
(void) st_setstring(strtbl, ofl->ofl_filtees, &stoff);
dyn->d_un.d_val = stoff;
dyn++;
}
}
if (ofl->ofl_rpath) {
(void) st_setstring(strtbl, ofl->ofl_rpath, &stoff);
dyn->d_tag = DT_RUNPATH;
dyn->d_un.d_val = stoff;
dyn++;
dyn->d_tag = DT_RPATH;
dyn->d_un.d_val = stoff;
dyn++;
}
if (not_relobj) {
Aliste idx;
Sg_desc *sgp;
if (ofl->ofl_config) {
dyn->d_tag = DT_CONFIG;
(void) st_setstring(strtbl, ofl->ofl_config, &stoff);
dyn->d_un.d_val = stoff;
dyn++;
}
if (ofl->ofl_depaudit) {
dyn->d_tag = DT_DEPAUDIT;
(void) st_setstring(strtbl, ofl->ofl_depaudit, &stoff);
dyn->d_un.d_val = stoff;
dyn++;
}
if (ofl->ofl_audit) {
dyn->d_tag = DT_AUDIT;
(void) st_setstring(strtbl, ofl->ofl_audit, &stoff);
dyn->d_un.d_val = stoff;
dyn++;
}
dyn->d_tag = DT_HASH;
dyn->d_un.d_ptr = ofl->ofl_oshash->os_shdr->sh_addr;
dyn++;
shdr = strosp->os_shdr;
dyn->d_tag = DT_STRTAB;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_STRSZ;
dyn->d_un.d_ptr = shdr->sh_size;
dyn++;
/*
* Note, the shdr is set and used in the ofl->ofl_osldynsym case
* that follows.
*/
shdr = symosp->os_shdr;
dyn->d_tag = DT_SYMTAB;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_SYMENT;
dyn->d_un.d_ptr = shdr->sh_entsize;
dyn++;
if (ofl->ofl_osldynsym) {
Shdr *lshdr = ofl->ofl_osldynsym->os_shdr;
/*
* We have arranged for the .SUNW_ldynsym data to be
* immediately in front of the .dynsym data.
* This means that you could start at the top
* of .SUNW_ldynsym and see the data for both tables
* without a break. This is the view we want to
* provide for DT_SUNW_SYMTAB, which is why we
* add the lengths together.
*/
dyn->d_tag = DT_SUNW_SYMTAB;
dyn->d_un.d_ptr = lshdr->sh_addr;
dyn++;
dyn->d_tag = DT_SUNW_SYMSZ;
dyn->d_un.d_val = lshdr->sh_size + shdr->sh_size;
dyn++;
}
if (ofl->ofl_osdynsymsort || ofl->ofl_osdyntlssort) {
dyn->d_tag = DT_SUNW_SORTENT;
dyn->d_un.d_val = sizeof (Word);
dyn++;
}
if (ofl->ofl_osdynsymsort) {
shdr = ofl->ofl_osdynsymsort->os_shdr;
dyn->d_tag = DT_SUNW_SYMSORT;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_SUNW_SYMSORTSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
}
if (ofl->ofl_osdyntlssort) {
shdr = ofl->ofl_osdyntlssort->os_shdr;
dyn->d_tag = DT_SUNW_TLSSORT;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_SUNW_TLSSORTSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
}
/*
* Reserve the DT_CHECKSUM entry. Its value will be filled in
* after the complete image is built.
*/
dyn->d_tag = DT_CHECKSUM;
ofl->ofl_checksum = &dyn->d_un.d_val;
dyn++;
/*
* Versioning sections: DT_VERDEF and DT_VERNEED.
*
* The Solaris ld does not produce DT_VERSYM, but the GNU ld
* does, in order to support their style of versioning, which
* differs from ours:
*
* - The top bit of the 16-bit Versym index is
* not part of the version, but is interpreted
* as a "hidden bit".
*
* - External (SHN_UNDEF) symbols can have non-zero
* Versym values, which specify versions in
* referenced objects, via the Verneed section.
*
* - The vna_other field of the Vernaux structures
* found in the Verneed section are not zero as
* with Solaris, but instead contain the version
* index to be used by Versym indices to reference
* the given external version.
*
* The Solaris ld, rtld, and elfdump programs all interpret the
* presence of DT_VERSYM as meaning that GNU versioning rules
* apply to the given file. If DT_VERSYM is not present,
* then Solaris versioning rules apply. If we should ever need
* to change our ld so that it does issue DT_VERSYM, then
* this rule for detecting GNU versioning will no longer work.
* In that case, we will have to invent a way to explicitly
* specify the style of versioning in use, perhaps via a
* new dynamic entry named something like DT_SUNW_VERSIONSTYLE,
* where the d_un.d_val value specifies which style is to be
* used.
*/
if ((flags & (FLG_OF_VERDEF | FLG_OF_NOVERSEC)) ==
FLG_OF_VERDEF) {
shdr = ofl->ofl_osverdef->os_shdr;
dyn->d_tag = DT_VERDEF;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_VERDEFNUM;
dyn->d_un.d_ptr = shdr->sh_info;
dyn++;
}
if ((flags & (FLG_OF_VERNEED | FLG_OF_NOVERSEC)) ==
FLG_OF_VERNEED) {
shdr = ofl->ofl_osverneed->os_shdr;
dyn->d_tag = DT_VERNEED;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_VERNEEDNUM;
dyn->d_un.d_ptr = shdr->sh_info;
dyn++;
}
if ((flags & FLG_OF_COMREL) && ofl->ofl_relocrelcnt) {
dyn->d_tag = ld_targ.t_m.m_rel_dt_count;
dyn->d_un.d_val = ofl->ofl_relocrelcnt;
dyn++;
}
if (flags & FLG_OF_TEXTREL) {
/*
* Only the presence of this entry is used in this
* implementation, not the value stored.
*/
dyn->d_tag = DT_TEXTREL;
dyn->d_un.d_val = 0;
dyn++;
}
if (ofl->ofl_osfiniarray) {
shdr = ofl->ofl_osfiniarray->os_shdr;
dyn->d_tag = DT_FINI_ARRAY;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_FINI_ARRAYSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
}
if (ofl->ofl_osinitarray) {
shdr = ofl->ofl_osinitarray->os_shdr;
dyn->d_tag = DT_INIT_ARRAY;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_INIT_ARRAYSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
}
if (ofl->ofl_ospreinitarray) {
shdr = ofl->ofl_ospreinitarray->os_shdr;
dyn->d_tag = DT_PREINIT_ARRAY;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_PREINIT_ARRAYSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
}
if (ofl->ofl_pltcnt) {
shdr = ofl->ofl_osplt->os_relosdesc->os_shdr;
dyn->d_tag = DT_PLTRELSZ;
dyn->d_un.d_ptr = shdr->sh_size;
dyn++;
dyn->d_tag = DT_PLTREL;
dyn->d_un.d_ptr = ld_targ.t_m.m_rel_dt_type;
dyn++;
dyn->d_tag = DT_JMPREL;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
}
if (ofl->ofl_pltpad) {
shdr = ofl->ofl_osplt->os_shdr;
dyn->d_tag = DT_PLTPAD;
if (ofl->ofl_pltcnt) {
dyn->d_un.d_ptr = shdr->sh_addr +
ld_targ.t_m.m_plt_reservsz +
ofl->ofl_pltcnt * ld_targ.t_m.m_plt_entsize;
} else
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_PLTPADSZ;
dyn->d_un.d_val = ofl->ofl_pltpad *
ld_targ.t_m.m_plt_entsize;
dyn++;
}
if (ofl->ofl_relocsz) {
shdr = ofl->ofl_osrelhead->os_shdr;
dyn->d_tag = ld_targ.t_m.m_rel_dt_type;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = ld_targ.t_m.m_rel_dt_size;
dyn->d_un.d_ptr = ofl->ofl_relocsz;
dyn++;
dyn->d_tag = ld_targ.t_m.m_rel_dt_ent;
if (shdr->sh_type == SHT_REL)
dyn->d_un.d_ptr = sizeof (Rel);
else
dyn->d_un.d_ptr = sizeof (Rela);
dyn++;
}
if (ofl->ofl_ossyminfo) {
shdr = ofl->ofl_ossyminfo->os_shdr;
dyn->d_tag = DT_SYMINFO;
dyn->d_un.d_ptr = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_SYMINSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
dyn->d_tag = DT_SYMINENT;
dyn->d_un.d_val = sizeof (Syminfo);
dyn++;
}
if (ofl->ofl_osmove) {
shdr = ofl->ofl_osmove->os_shdr;
dyn->d_tag = DT_MOVETAB;
dyn->d_un.d_val = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_MOVESZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
dyn->d_tag = DT_MOVEENT;
dyn->d_un.d_val = shdr->sh_entsize;
dyn++;
}
if (ofl->ofl_regsymcnt) {
int ndx;
for (ndx = 0; ndx < ofl->ofl_regsymsno; ndx++) {
if ((sdp = ofl->ofl_regsyms[ndx]) == NULL)
continue;
dyn->d_tag = ld_targ.t_m.m_dt_register;
dyn->d_un.d_val = sdp->sd_symndx;
dyn++;
}
}
for (APLIST_TRAVERSE(ofl->ofl_rtldinfo, idx, sdp)) {
dyn->d_tag = DT_SUNW_RTLDINF;
dyn->d_un.d_ptr = sdp->sd_sym->st_value;
dyn++;
}
if (((sgp = ofl->ofl_osdynamic->os_sgdesc) != NULL) &&
(sgp->sg_phdr.p_flags & PF_W) && ofl->ofl_osinterp) {
dyn->d_tag = DT_DEBUG;
dyn->d_un.d_ptr = 0;
dyn++;
}
if (ofl->ofl_oscap) {
dyn->d_tag = DT_SUNW_CAP;
dyn->d_un.d_val = ofl->ofl_oscap->os_shdr->sh_addr;
dyn++;
}
if (ofl->ofl_oscapinfo) {
dyn->d_tag = DT_SUNW_CAPINFO;
dyn->d_un.d_val = ofl->ofl_oscapinfo->os_shdr->sh_addr;
dyn++;
}
if (ofl->ofl_oscapchain) {
shdr = ofl->ofl_oscapchain->os_shdr;
dyn->d_tag = DT_SUNW_CAPCHAIN;
dyn->d_un.d_val = shdr->sh_addr;
dyn++;
dyn->d_tag = DT_SUNW_CAPCHAINSZ;
dyn->d_un.d_val = shdr->sh_size;
dyn++;
dyn->d_tag = DT_SUNW_CAPCHAINENT;
dyn->d_un.d_val = shdr->sh_entsize;
dyn++;
}
if (ofl->ofl_aslr != 0) {
dyn->d_tag = DT_SUNW_ASLR;
dyn->d_un.d_val = (ofl->ofl_aslr == 1);
dyn++;
}
if (flags & FLG_OF_SYMBOLIC) {
dyn->d_tag = DT_SYMBOLIC;
dyn->d_un.d_val = 0;
dyn++;
}
}
dyn->d_tag = DT_FLAGS;
dyn->d_un.d_val = ofl->ofl_dtflags;
dyn++;
/*
* If -Bdirect was specified, but some NODIRECT symbols were specified
* via a mapfile, or -znodirect was used on the command line, then
* clear the DF_1_DIRECT flag. The resultant object will use per-symbol
* direct bindings rather than be enabled for global direct bindings.
*
* If any no-direct bindings exist within this object, set the
* DF_1_NODIRECT flag. ld(1) recognizes this flag when processing
* dependencies, and performs extra work to ensure that no direct
* bindings are established to the no-direct symbols that exist
* within these dependencies.
*/
if (ofl->ofl_flags1 & FLG_OF1_NGLBDIR)
ofl->ofl_dtflags_1 &= ~DF_1_DIRECT;
if (ofl->ofl_flags1 & FLG_OF1_NDIRECT)
ofl->ofl_dtflags_1 |= DF_1_NODIRECT;
dyn->d_tag = DT_FLAGS_1;
dyn->d_un.d_val = ofl->ofl_dtflags_1;
dyn++;
dyn->d_tag = DT_SUNW_STRPAD;
dyn->d_un.d_val = DYNSTR_EXTRA_PAD;
dyn++;
dyn->d_tag = DT_SUNW_LDMACH;
dyn->d_un.d_val = ld_sunw_ldmach();
dyn++;
if (ofl->ofl_flags & FLG_OF_KMOD) {
dyn->d_tag = DT_SUNW_KMOD;
dyn->d_un.d_val = 1;
dyn++;
}
(*ld_targ.t_mr.mr_mach_update_odynamic)(ofl, &dyn);
for (cnt = 1 + DYNAMIC_EXTRA_ELTS; cnt--; dyn++) {
dyn->d_tag = DT_NULL;
dyn->d_un.d_val = 0;
}
/*
* Ensure that we wrote the right number of entries. If not, we either
* miscounted in make_dynamic(), or we did something wrong in this
* function.
*/
assert((ofl->ofl_osdynamic->os_shdr->sh_size /
ofl->ofl_osdynamic->os_shdr->sh_entsize) ==
((uintptr_t)dyn - (uintptr_t)_dyn) / sizeof (*dyn));
return (1);
}
/*
* Build the version definition section
*/
static int
update_overdef(Ofl_desc *ofl)
{
Aliste idx1;
Ver_desc *vdp, *_vdp;
Verdef *vdf, *_vdf;
int num = 0;
Os_desc *strosp;
Str_tbl *strtbl;
/*
* Determine which string table to use.
*/
if (OFL_IS_STATIC_OBJ(ofl)) {
strtbl = ofl->ofl_strtab;
strosp = ofl->ofl_osstrtab;
} else {
strtbl = ofl->ofl_dynstrtab;
strosp = ofl->ofl_osdynstr;
}
/*
* Traverse the version descriptors and update the version structures
* to point to the dynstr name in preparation for building the version
* section structure.
*/
for (APLIST_TRAVERSE(ofl->ofl_verdesc, idx1, vdp)) {
Sym_desc *sdp;
if (vdp->vd_flags & VER_FLG_BASE) {
const char *name = vdp->vd_name;
size_t stoff;
/*
* Create a new string table entry to represent the base
* version name (there is no corresponding symbol for
* this).
*/
(void) st_setstring(strtbl, name, &stoff);
/* LINTED */
vdp->vd_name = (const char *)stoff;
} else {
sdp = ld_sym_find(vdp->vd_name, vdp->vd_hash, 0, ofl);
/* LINTED */
vdp->vd_name = (const char *)
(uintptr_t)sdp->sd_sym->st_name;
}
}
_vdf = vdf = (Verdef *)ofl->ofl_osverdef->os_outdata->d_buf;
/*
* Traverse the version descriptors and update the version section to
* reflect each version and its associated dependencies.
*/
for (APLIST_TRAVERSE(ofl->ofl_verdesc, idx1, vdp)) {
Aliste idx2;
Half cnt = 1;
Verdaux *vdap, *_vdap;
_vdap = vdap = (Verdaux *)(vdf + 1);
vdf->vd_version = VER_DEF_CURRENT;
vdf->vd_flags = vdp->vd_flags & MSK_VER_USER;
vdf->vd_ndx = vdp->vd_ndx;
vdf->vd_hash = vdp->vd_hash;
/* LINTED */
vdap->vda_name = (uintptr_t)vdp->vd_name;
vdap++;
/* LINTED */
_vdap->vda_next = (Word)((uintptr_t)vdap - (uintptr_t)_vdap);
/*
* Traverse this versions dependency list generating the
* appropriate version dependency entries.
*/
for (APLIST_TRAVERSE(vdp->vd_deps, idx2, _vdp)) {
/* LINTED */
vdap->vda_name = (uintptr_t)_vdp->vd_name;
_vdap = vdap;
vdap++, cnt++;
/* LINTED */
_vdap->vda_next = (Word)((uintptr_t)vdap -
(uintptr_t)_vdap);
}
_vdap->vda_next = 0;
/*
* Record the versions auxiliary array offset and the associated
* dependency count.
*/
/* LINTED */
vdf->vd_aux = (Word)((uintptr_t)(vdf + 1) - (uintptr_t)vdf);
vdf->vd_cnt = cnt;
/*
* Record the next versions offset and update the version
* pointer. Remember the previous version offset as the very
* last structures next pointer should be null.
*/
_vdf = vdf;
vdf = (Verdef *)vdap, num++;
/* LINTED */
_vdf->vd_next = (Word)((uintptr_t)vdf - (uintptr_t)_vdf);
}
_vdf->vd_next = 0;
/*
* Record the string table association with the version definition
* section, and the symbol table associated with the version symbol
* table (the actual contents of the version symbol table are filled
* in during symbol update).
*/
/* LINTED */
ofl->ofl_osverdef->os_shdr->sh_link = (Word)elf_ndxscn(strosp->os_scn);
/*
* The version definition sections `info' field is used to indicate the
* number of entries in this section.
*/
ofl->ofl_osverdef->os_shdr->sh_info = num;
return (1);
}
/*
* Finish the version symbol index section
*/
static void
update_oversym(Ofl_desc *ofl)
{
Os_desc *osp;
/*
* Record the symbol table associated with the version symbol table.
* The contents of the version symbol table are filled in during
* symbol update.
*/
if (OFL_IS_STATIC_OBJ(ofl))
osp = ofl->ofl_ossymtab;
else
osp = ofl->ofl_osdynsym;
/* LINTED */
ofl->ofl_osversym->os_shdr->sh_link = (Word)elf_ndxscn(osp->os_scn);
}
/*
* Build the version needed section
*/
static int
update_overneed(Ofl_desc *ofl)
{
Aliste idx1;
Ifl_desc *ifl;
Verneed *vnd, *_vnd;
Os_desc *strosp;
Str_tbl *strtbl;
Word num = 0;
_vnd = vnd = (Verneed *)ofl->ofl_osverneed->os_outdata->d_buf;
/*
* Determine which string table is appropriate.
*/
if (OFL_IS_STATIC_OBJ(ofl)) {
strosp = ofl->ofl_osstrtab;
strtbl = ofl->ofl_strtab;
} else {
strosp = ofl->ofl_osdynstr;
strtbl = ofl->ofl_dynstrtab;
}
/*
* Traverse the shared object list looking for dependencies that have
* versions defined within them.
*/
for (APLIST_TRAVERSE(ofl->ofl_sos, idx1, ifl)) {
Half _cnt;
Word cnt = 0;
Vernaux *_vnap, *vnap;
size_t stoff;
if (!(ifl->ifl_flags & FLG_IF_VERNEED))
continue;
vnd->vn_version = VER_NEED_CURRENT;
(void) st_setstring(strtbl, ifl->ifl_soname, &stoff);
vnd->vn_file = stoff;
_vnap = vnap = (Vernaux *)(vnd + 1);
/*
* Traverse the version index list recording
* each version as a needed dependency.
*/
for (_cnt = 0; _cnt <= ifl->ifl_vercnt; _cnt++) {
Ver_index *vip = &ifl->ifl_verndx[_cnt];
if (vip->vi_flags & FLG_VER_REFER) {
(void) st_setstring(strtbl, vip->vi_name,
&stoff);
vnap->vna_name = stoff;
if (vip->vi_desc) {
vnap->vna_hash = vip->vi_desc->vd_hash;
vnap->vna_flags =
vip->vi_desc->vd_flags;
} else {
vnap->vna_hash = 0;
vnap->vna_flags = 0;
}
vnap->vna_other = vip->vi_overndx;
/*
* If version A inherits version B, then
* B is implicit in A. It suffices for ld.so.1
* to verify A at runtime and skip B. The
* version normalization process sets the INFO
* flag for the versions we want ld.so.1 to
* skip.
*/
if (vip->vi_flags & VER_FLG_INFO)
vnap->vna_flags |= VER_FLG_INFO;
_vnap = vnap;
vnap++, cnt++;
_vnap->vna_next =
/* LINTED */
(Word)((uintptr_t)vnap - (uintptr_t)_vnap);
}
}
_vnap->vna_next = 0;
/*
* Record the versions auxiliary array offset and
* the associated dependency count.
*/
/* LINTED */
vnd->vn_aux = (Word)((uintptr_t)(vnd + 1) - (uintptr_t)vnd);
/* LINTED */
vnd->vn_cnt = (Half)cnt;
/*
* Record the next versions offset and update the version
* pointer. Remember the previous version offset as the very
* last structures next pointer should be null.
*/
_vnd = vnd;
vnd = (Verneed *)vnap, num++;
/* LINTED */
_vnd->vn_next = (Word)((uintptr_t)vnd - (uintptr_t)_vnd);
}
_vnd->vn_next = 0;
/*
* Use sh_link to record the associated string table section, and
* sh_info to indicate the number of entries contained in the section.
*/
/* LINTED */
ofl->ofl_osverneed->os_shdr->sh_link = (Word)elf_ndxscn(strosp->os_scn);
ofl->ofl_osverneed->os_shdr->sh_info = num;
return (1);
}
/*
* Update syminfo section.
*/
static uintptr_t
update_osyminfo(Ofl_desc *ofl)
{
Os_desc *symosp, *infosp = ofl->ofl_ossyminfo;
Syminfo *sip = infosp->os_outdata->d_buf;
Shdr *shdr = infosp->os_shdr;
char *strtab;
Aliste idx;
Sym_desc *sdp;
Sfltr_desc *sftp;
if (ofl->ofl_flags & FLG_OF_RELOBJ) {
symosp = ofl->ofl_ossymtab;
strtab = ofl->ofl_osstrtab->os_outdata->d_buf;
} else {
symosp = ofl->ofl_osdynsym;
strtab = ofl->ofl_osdynstr->os_outdata->d_buf;
}
/* LINTED */
infosp->os_shdr->sh_link = (Word)elf_ndxscn(symosp->os_scn);
if (ofl->ofl_osdynamic)
infosp->os_shdr->sh_info =
/* LINTED */
(Word)elf_ndxscn(ofl->ofl_osdynamic->os_scn);
/*
* Update any references with the index into the dynamic table.
*/
for (APLIST_TRAVERSE(ofl->ofl_symdtent, idx, sdp))
sip[sdp->sd_symndx].si_boundto = sdp->sd_file->ifl_neededndx;
/*
* Update any filtee references with the index into the dynamic table.
*/
for (ALIST_TRAVERSE(ofl->ofl_symfltrs, idx, sftp)) {
Dfltr_desc *dftp;
dftp = alist_item(ofl->ofl_dtsfltrs, sftp->sft_idx);
sip[sftp->sft_sdp->sd_symndx].si_boundto = dftp->dft_ndx;
}
/*
* Display debugging information about section.
*/
DBG_CALL(Dbg_syminfo_title(ofl->ofl_lml));
if (DBG_ENABLED) {
Word _cnt, cnt = shdr->sh_size / shdr->sh_entsize;
Sym *symtab = symosp->os_outdata->d_buf;
Dyn *dyn;
if (ofl->ofl_osdynamic)
dyn = ofl->ofl_osdynamic->os_outdata->d_buf;
else
dyn = NULL;
for (_cnt = 1; _cnt < cnt; _cnt++) {
if (sip[_cnt].si_flags || sip[_cnt].si_boundto)
/* LINTED */
DBG_CALL(Dbg_syminfo_entry(ofl->ofl_lml, _cnt,
&sip[_cnt], &symtab[_cnt], strtab, dyn));
}
}
return (1);
}
/*
* Build the output elf header.
*/
static uintptr_t
update_oehdr(Ofl_desc * ofl)
{
Ehdr *ehdr = ofl->ofl_nehdr;
/*
* If an entry point symbol has already been established (refer
* sym_validate()) simply update the elf header entry point with the
* symbols value. If no entry point is defined it will have been filled
* with the start address of the first section within the text segment
* (refer update_outfile()).
*/
if (ofl->ofl_entry)
ehdr->e_entry =
((Sym_desc *)(ofl->ofl_entry))->sd_sym->st_value;
ehdr->e_ident[EI_DATA] = ld_targ.t_m.m_data;
ehdr->e_version = ofl->ofl_dehdr->e_version;
/*
* When generating a relocatable object under -z symbolcap, set the
* e_machine to be generic, and remove any e_flags. Input relocatable
* objects may identify alternative e_machine (m.machplus) and e_flags
* values. However, the functions within the created output object
* are selected at runtime using the capabilities mechanism, which
* supersedes the e-machine and e_flags information. Therefore,
* e_machine and e_flag values are not propagated to the output object,
* as these values might prevent the kernel from loading the object
* before the runtime linker gets control.
*/
if (ofl->ofl_flags & FLG_OF_OTOSCAP) {
ehdr->e_machine = ld_targ.t_m.m_mach;
ehdr->e_flags = 0;
} else {
/*
* Note. it may be necessary to update the e_flags field in the
* machine dependent section.
*/
ehdr->e_machine = ofl->ofl_dehdr->e_machine;
ehdr->e_flags = ofl->ofl_dehdr->e_flags;
if (ehdr->e_machine != ld_targ.t_m.m_mach) {
if (ehdr->e_machine != ld_targ.t_m.m_machplus)
return (S_ERROR);
if ((ehdr->e_flags & ld_targ.t_m.m_flagsplus) == 0)
return (S_ERROR);
}
}
if (ofl->ofl_flags & FLG_OF_SHAROBJ)
ehdr->e_type = ET_DYN;
else if (ofl->ofl_flags & FLG_OF_RELOBJ)
ehdr->e_type = ET_REL;
else
ehdr->e_type = ET_EXEC;
return (1);
}
/*
* Perform move table expansion.
*/
static void
expand_move(Ofl_desc *ofl, Sym_desc *sdp, Move *mvp)
{
Os_desc *osp;
uchar_t *taddr, *taddr0;
Sxword offset;
Half cnt;
uint_t stride;
osp = ofl->ofl_isparexpn->is_osdesc;
offset = sdp->sd_sym->st_value - osp->os_shdr->sh_addr;
taddr0 = taddr = osp->os_outdata->d_buf;
taddr += offset;
taddr = taddr + mvp->m_poffset;
for (cnt = 0; cnt < mvp->m_repeat; cnt++) {
/* LINTED */
DBG_CALL(Dbg_move_expand(ofl->ofl_lml, mvp,
(Addr)(taddr - taddr0)));
stride = (uint_t)mvp->m_stride + 1;
/*
* Update the target address based upon the move entry size.
* This size was validated in ld_process_move().
*/
/* LINTED */
switch (ELF_M_SIZE(mvp->m_info)) {
case 1:
/* LINTED */
*taddr = (uchar_t)mvp->m_value;
taddr += stride;
break;
case 2:
/* LINTED */
*((Half *)taddr) = (Half)mvp->m_value;
taddr += 2 * stride;
break;
case 4:
/* LINTED */
*((Word *)taddr) = (Word)mvp->m_value;
taddr += 4 * stride;
break;
case 8:
/* LINTED */
*((u_longlong_t *)taddr) = mvp->m_value;
taddr += 8 * stride;
break;
}
}
}
/*
* Update Move sections.
*/
static void
update_move(Ofl_desc *ofl)
{
Word ndx = 0;
ofl_flag_t flags = ofl->ofl_flags;
Move *omvp;
Aliste idx1;
Sym_desc *sdp;
/*
* Determine the index of the symbol table that will be referenced by
* the Move section.
*/
if (OFL_ALLOW_DYNSYM(ofl))
/* LINTED */
ndx = (Word) elf_ndxscn(ofl->ofl_osdynsym->os_scn);
else if (!(flags & FLG_OF_STRIP) || (flags & FLG_OF_RELOBJ))
/* LINTED */
ndx = (Word) elf_ndxscn(ofl->ofl_ossymtab->os_scn);
/*
* Update sh_link of the Move section, and point to the new Move data.
*/
if (ofl->ofl_osmove) {
ofl->ofl_osmove->os_shdr->sh_link = ndx;
omvp = (Move *)ofl->ofl_osmove->os_outdata->d_buf;
}
/*
* Update symbol entry index
*/
for (APLIST_TRAVERSE(ofl->ofl_parsyms, idx1, sdp)) {
Aliste idx2;
Mv_desc *mdp;
/*
* Expand move table
*/
if (sdp->sd_flags & FLG_SY_PAREXPN) {
const char *str;
if (flags & FLG_OF_STATIC)
str = MSG_INTL(MSG_PSYM_EXPREASON1);
else if (ofl->ofl_flags1 & FLG_OF1_NOPARTI)
str = MSG_INTL(MSG_PSYM_EXPREASON2);
else
str = MSG_INTL(MSG_PSYM_EXPREASON3);
DBG_CALL(Dbg_move_parexpn(ofl->ofl_lml,
sdp->sd_name, str));
for (ALIST_TRAVERSE(sdp->sd_move, idx2, mdp)) {
DBG_CALL(Dbg_move_entry1(ofl->ofl_lml, 0,
mdp->md_move, sdp));
expand_move(ofl, sdp, mdp->md_move);
}
continue;
}
/*
* Process move table
*/
DBG_CALL(Dbg_move_outmove(ofl->ofl_lml, sdp->sd_name));
for (ALIST_TRAVERSE(sdp->sd_move, idx2, mdp)) {
Move *imvp;
int idx = 1;
Sym *sym;
imvp = mdp->md_move;
sym = sdp->sd_sym;
DBG_CALL(Dbg_move_entry1(ofl->ofl_lml, 1, imvp, sdp));
*omvp = *imvp;
if ((flags & FLG_OF_RELOBJ) == 0) {
if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
Os_desc *osp = sdp->sd_isc->is_osdesc;
Word ndx = osp->os_identndx;
omvp->m_info =
/* LINTED */
ELF_M_INFO(ndx, imvp->m_info);
if (ELF_ST_TYPE(sym->st_info) !=
STT_SECTION) {
omvp->m_poffset =
sym->st_value -
osp->os_shdr->sh_addr +
imvp->m_poffset;
}
} else {
omvp->m_info =
/* LINTED */
ELF_M_INFO(sdp->sd_symndx,
imvp->m_info);
}
} else {
Boolean isredloc = FALSE;
if ((ELF_ST_BIND(sym->st_info) == STB_LOCAL) &&
(ofl->ofl_flags & FLG_OF_REDLSYM))
isredloc = TRUE;
if (isredloc && !(sdp->sd_move)) {
Os_desc *osp = sdp->sd_isc->is_osdesc;
Word ndx = osp->os_identndx;
omvp->m_info =
/* LINTED */
ELF_M_INFO(ndx, imvp->m_info);
omvp->m_poffset += sym->st_value;
} else {
if (isredloc)
DBG_CALL(Dbg_syms_reduce(ofl,
DBG_SYM_REDUCE_RETAIN,
sdp, idx,
ofl->ofl_osmove->os_name));
omvp->m_info =
/* LINTED */
ELF_M_INFO(sdp->sd_symndx,
imvp->m_info);
}
}
DBG_CALL(Dbg_move_entry1(ofl->ofl_lml, 0, omvp, sdp));
omvp++;
idx++;
}
}
}
/*
* Scan through the SHT_GROUP output sections. Update their sh_link/sh_info
* fields as well as the section contents.
*/
static uintptr_t
update_ogroup(Ofl_desc *ofl)
{
Aliste idx;
Os_desc *osp;
uintptr_t error = 0;
for (APLIST_TRAVERSE(ofl->ofl_osgroups, idx, osp)) {
Is_desc *isp;
Ifl_desc *ifl;
Shdr *shdr = osp->os_shdr;
Sym_desc *sdp;
Xword i, grpcnt;
Word *gdata;
/*
* Since input GROUP sections always create unique
* output GROUP sections - we know there is only one
* item on the list.
*/
isp = ld_os_first_isdesc(osp);
ifl = isp->is_file;
sdp = ifl->ifl_oldndx[isp->is_shdr->sh_info];
shdr->sh_link = (Word)elf_ndxscn(ofl->ofl_ossymtab->os_scn);
shdr->sh_info = sdp->sd_symndx;
/*
* Scan through the group data section and update
* all of the links to new values.
*/
grpcnt = shdr->sh_size / shdr->sh_entsize;
gdata = (Word *)osp->os_outdata->d_buf;
for (i = 1; i < grpcnt; i++) {
Os_desc *_osp;
Is_desc *_isp = ifl->ifl_isdesc[gdata[i]];
/*
* If the referenced section didn't make it to the
* output file - just zero out the entry.
*/
if ((_osp = _isp->is_osdesc) == NULL)
gdata[i] = 0;
else
gdata[i] = (Word)elf_ndxscn(_osp->os_scn);
}
}
return (error);
}
static void
update_ostrtab(Os_desc *osp, Str_tbl *stp, uint_t extra)
{
Elf_Data *data;
if (osp == NULL)
return;
data = osp->os_outdata;
assert(data->d_size == (st_getstrtab_sz(stp) + extra));
(void) st_setstrbuf(stp, data->d_buf, data->d_size - extra);
/* If leaving an extra hole at the end, zero it */
if (extra > 0)
(void) memset((char *)data->d_buf + data->d_size - extra,
0x0, extra);
}
/*
* Update capabilities information.
*
* If string table capabilities exist, then the associated string must be
* translated into an offset into the string table.
*/
static void
update_oscap(Ofl_desc *ofl)
{
Os_desc *strosp, *cosp;
Cap *cap;
Str_tbl *strtbl;
Capstr *capstr;
size_t stoff;
Aliste idx1;
/*
* Determine which symbol table or string table is appropriate.
*/
if (OFL_IS_STATIC_OBJ(ofl)) {
strosp = ofl->ofl_osstrtab;
strtbl = ofl->ofl_strtab;
} else {
strosp = ofl->ofl_osdynstr;
strtbl = ofl->ofl_dynstrtab;
}
/*
* If symbol capabilities exist, set the sh_link field of the .SUNW_cap
* section to the .SUNW_capinfo section.
*/
if (ofl->ofl_oscapinfo) {
cosp = ofl->ofl_oscap;
cosp->os_shdr->sh_link =
(Word)elf_ndxscn(ofl->ofl_oscapinfo->os_scn);
}
/*
* If there are capability strings to process, set the sh_info
* field of the .SUNW_cap section to the associated string table, and
* proceed to process any CA_SUNW_PLAT entries.
*/
if ((ofl->ofl_flags & FLG_OF_CAPSTRS) == 0)
return;
cosp = ofl->ofl_oscap;
cosp->os_shdr->sh_info = (Word)elf_ndxscn(strosp->os_scn);
cap = ofl->ofl_oscap->os_outdata->d_buf;
/*
* Determine whether an object capability identifier, or object
* machine/platform capabilities exists.
*/
capstr = &ofl->ofl_ocapset.oc_id;
if (capstr->cs_str) {
(void) st_setstring(strtbl, capstr->cs_str, &stoff);
cap[capstr->cs_ndx].c_un.c_ptr = stoff;
}
for (ALIST_TRAVERSE(ofl->ofl_ocapset.oc_plat.cl_val, idx1, capstr)) {
(void) st_setstring(strtbl, capstr->cs_str, &stoff);
cap[capstr->cs_ndx].c_un.c_ptr = stoff;
}
for (ALIST_TRAVERSE(ofl->ofl_ocapset.oc_mach.cl_val, idx1, capstr)) {
(void) st_setstring(strtbl, capstr->cs_str, &stoff);
cap[capstr->cs_ndx].c_un.c_ptr = stoff;
}
/*
* Determine any symbol capability identifiers, or machine/platform
* capabilities.
*/
if (ofl->ofl_capgroups) {
Cap_group *cgp;
for (APLIST_TRAVERSE(ofl->ofl_capgroups, idx1, cgp)) {
Objcapset *ocapset = &cgp->cg_set;
Aliste idx2;
capstr = &ocapset->oc_id;
if (capstr->cs_str) {
(void) st_setstring(strtbl, capstr->cs_str,
&stoff);
cap[capstr->cs_ndx].c_un.c_ptr = stoff;
}
for (ALIST_TRAVERSE(ocapset->oc_plat.cl_val, idx2,
capstr)) {
(void) st_setstring(strtbl, capstr->cs_str,
&stoff);
cap[capstr->cs_ndx].c_un.c_ptr = stoff;
}
for (ALIST_TRAVERSE(ocapset->oc_mach.cl_val, idx2,
capstr)) {
(void) st_setstring(strtbl, capstr->cs_str,
&stoff);
cap[capstr->cs_ndx].c_un.c_ptr = stoff;
}
}
}
}
/*
* Update the .SUNW_capinfo, and possibly the .SUNW_capchain sections.
*/
static void
update_oscapinfo(Ofl_desc *ofl)
{
Os_desc *symosp, *ciosp, *ccosp = NULL;
Capinfo *ocapinfo;
Capchain *ocapchain;
Cap_avlnode *cav;
Word chainndx = 0;
/*
* Determine which symbol table is appropriate.
*/
if (OFL_IS_STATIC_OBJ(ofl))
symosp = ofl->ofl_ossymtab;
else
symosp = ofl->ofl_osdynsym;
/*
* Update the .SUNW_capinfo sh_link to point to the appropriate symbol
* table section. If we're creating a dynamic object, the
* .SUNW_capinfo sh_info is updated to point to the .SUNW_capchain
* section.
*/
ciosp = ofl->ofl_oscapinfo;
ciosp->os_shdr->sh_link = (Word)elf_ndxscn(symosp->os_scn);
if (OFL_IS_STATIC_OBJ(ofl) == 0) {
ccosp = ofl->ofl_oscapchain;
ciosp->os_shdr->sh_info = (Word)elf_ndxscn(ccosp->os_scn);
}
/*
* Establish the data for each section. The first element of each
* section defines the section's version number.
*/
ocapinfo = ciosp->os_outdata->d_buf;
ocapinfo[0] = CAPINFO_CURRENT;
if (ccosp) {
ocapchain = ccosp->os_outdata->d_buf;
ocapchain[chainndx++] = CAPCHAIN_CURRENT;
}
/*
* Traverse all capabilities families. Each member has a .SUNW_capinfo
* assignment. The .SUNW_capinfo entry differs for relocatable objects
* and dynamic objects.
*
* Relocatable objects:
* ELF_C_GROUP ELF_C_SYM
*
* Family lead: CAPINFO_SUNW_GLOB lead symbol index
* Family lead alias: CAPINFO_SUNW_GLOB lead symbol index
* Family member: .SUNW_cap index lead symbol index
*
* Dynamic objects:
* ELF_C_GROUP ELF_C_SYM
*
* Family lead: CAPINFO_SUNW_GLOB .SUNW_capchain index
* Family lead alias: CAPINFO_SUNW_GLOB .SUNW_capchain index
* Family member: .SUNW_cap index lead symbol index
*
* The ELF_C_GROUP field identifies a capabilities symbol. Lead
* capability symbols, and lead capability aliases are identified by
* a CAPINFO_SUNW_GLOB group identifier. For family members, the
* ELF_C_GROUP provides an index to the associate capabilities group
* (i.e, an index into the SUNW_cap section that defines a group).
*
* For relocatable objects, the ELF_C_SYM field identifies the lead
* capability symbol. For the lead symbol itself, the .SUNW_capinfo
* index is the same as the ELF_C_SYM value. For lead alias symbols,
* the .SUNW_capinfo index differs from the ELF_C_SYM value. This
* differentiation of CAPINFO_SUNW_GLOB symbols allows ld(1) to
* identify, and propagate lead alias symbols. For example, the lead
* capability symbol memcpy() would have the ELF_C_SYM for memcpy(),
* and the lead alias _memcpy() would also have the ELF_C_SYM for
* memcpy().
*
* For dynamic objects, both a lead capability symbol, and alias symbol
* would have a ELF_C_SYM value that represents the same capability
* chain index. The capability chain allows ld.so.1 to traverse a
* family chain for a given lead symbol, and select the most appropriate
* family member. The .SUNW_capchain array contains a series of symbol
* indexes for each family member:
*
* chaincap[n] chaincap[n + 1] chaincap[n + 2] chaincap[n + x]
* foo() ndx foo%x() ndx foo%y() ndx 0
*
* For family members, the ELF_C_SYM value associates the capability
* members with their family lead symbol. This association, although
* unused within a dynamic object, allows ld(1) to identify, and
* propagate family members when processing relocatable objects.
*/
for (cav = avl_first(ofl->ofl_capfamilies); cav;
cav = AVL_NEXT(ofl->ofl_capfamilies, cav)) {
Cap_sym *csp;
Aliste idx;
Sym_desc *asdp, *lsdp = cav->cn_symavlnode.sav_sdp;
if (ccosp) {
/*
* For a dynamic object, identify this lead symbol, and
* point it to the head of a capability chain. Set the
* head of the capability chain to the same lead symbol.
*/
ocapinfo[lsdp->sd_symndx] =
ELF_C_INFO(chainndx, CAPINFO_SUNW_GLOB);
ocapchain[chainndx] = lsdp->sd_symndx;
} else {
/*
* For a relocatable object, identify this lead symbol,
* and set the lead symbol index to itself.
*/
ocapinfo[lsdp->sd_symndx] =
ELF_C_INFO(lsdp->sd_symndx, CAPINFO_SUNW_GLOB);
}
/*
* Gather any lead symbol aliases.
*/
for (APLIST_TRAVERSE(cav->cn_aliases, idx, asdp)) {
if (ccosp) {
/*
* For a dynamic object, identify this lead
* alias symbol, and point it to the same
* capability chain index as the lead symbol.
*/
ocapinfo[asdp->sd_symndx] =
ELF_C_INFO(chainndx, CAPINFO_SUNW_GLOB);
} else {
/*
* For a relocatable object, identify this lead
* alias symbol, and set the lead symbol index
* to the lead symbol.
*/
ocapinfo[asdp->sd_symndx] =
ELF_C_INFO(lsdp->sd_symndx,
CAPINFO_SUNW_GLOB);
}
}
chainndx++;
/*
* Gather the family members.
*/
for (APLIST_TRAVERSE(cav->cn_members, idx, csp)) {
Sym_desc *msdp = csp->cs_sdp;
/*
* Identify the members capability group, and the lead
* symbol of the family this symbol is a member of.
*/
ocapinfo[msdp->sd_symndx] =
ELF_C_INFO(lsdp->sd_symndx, csp->cs_group->cg_ndx);
if (ccosp) {
/*
* For a dynamic object, set the next capability
* chain to point to this family member.
*/
ocapchain[chainndx++] = msdp->sd_symndx;
}
}
/*
* Any chain of family members is terminated with a 0 element.
*/
if (ccosp)
ocapchain[chainndx++] = 0;
}
}
/*
* Translate the shdr->sh_{link, info} from its input section value to that
* of the corresponding shdr->sh_{link, info} output section value.
*/
static Word
translate_link(Ofl_desc *ofl, Os_desc *osp, Word link, const char *msg)
{
Is_desc *isp;
Ifl_desc *ifl;
/*
* Don't translate the special section numbers.
*/
if (link >= SHN_LORESERVE)
return (link);
/*
* Does this output section translate back to an input file. If not
* then there is no translation to do. In this case we will assume that
* if sh_link has a value, it's the right value.
*/
isp = ld_os_first_isdesc(osp);
if ((ifl = isp->is_file) == NULL)
return (link);
/*
* Sanity check to make sure that the sh_{link, info} value
* is within range for the input file.
*/
if (link >= ifl->ifl_shnum) {
ld_eprintf(ofl, ERR_WARNING, msg, ifl->ifl_name,
EC_WORD(isp->is_scnndx), isp->is_name, EC_XWORD(link));
return (link);
}
/*
* Follow the link to the input section.
*/
if ((isp = ifl->ifl_isdesc[link]) == NULL)
return (0);
if ((osp = isp->is_osdesc) == NULL)
return (0);
/* LINTED */
return ((Word)elf_ndxscn(osp->os_scn));
}
/*
* Having created all of the necessary sections, segments, and associated
* headers, fill in the program headers and update any other data in the
* output image. Some general rules:
*
* - If an interpreter is required always generate a PT_PHDR entry as
* well. It is this entry that triggers the kernel into passing the
* interpreter an aux vector instead of just a file descriptor.
*
* - When generating an image that will be interpreted (ie. a dynamic
* executable, a shared object, or a static executable that has been
* provided with an interpreter - weird, but possible), make the initial
* loadable segment include both the ehdr and phdr[]. Both of these
* tables are used by the interpreter therefore it seems more intuitive
* to explicitly defined them as part of the mapped image rather than
* relying on page rounding by the interpreter to allow their access.
*
* - When generating a static image that does not require an interpreter
* have the first loadable segment indicate the address of the first
* .section as the start address (things like /kernel/unix and ufsboot
* expect this behavior).
*/
uintptr_t
ld_update_outfile(Ofl_desc *ofl)
{
Addr size, etext, vaddr;
Sg_desc *sgp;
Sg_desc *dtracesgp = NULL, *capsgp = NULL, *intpsgp = NULL;
Os_desc *osp;
int phdrndx = 0, segndx = -1, secndx, intppndx, intpsndx;
int dtracepndx, dtracesndx, cappndx, capsndx;
Ehdr *ehdr = ofl->ofl_nehdr;
Shdr *hshdr;
Phdr *_phdr = NULL;
Word phdrsz = (ehdr->e_phnum * ehdr->e_phentsize), shscnndx;
ofl_flag_t flags = ofl->ofl_flags;
Word ehdrsz = ehdr->e_ehsize;
Boolean nobits;
Off offset;
Aliste idx1;
/*
* Initialize the starting address for the first segment. Executables
* have different starting addresses depending upon the target ABI,
* where as shared objects have a starting address of 0. If this is
* a 64-bit executable that is being constructed to run in a restricted
* address space, use an alternative origin that will provide more free
* address space for the the eventual process.
*/
if (ofl->ofl_flags & FLG_OF_EXEC) {
#if defined(_ELF64)
if (ofl->ofl_ocapset.oc_sf_1.cm_val & SF1_SUNW_ADDR32)
vaddr = ld_targ.t_m.m_segm_aorigin;
else
#endif
vaddr = ld_targ.t_m.m_segm_origin;
} else
vaddr = 0;
/*
* Loop through the segment descriptors and pick out what we need.
*/
DBG_CALL(Dbg_seg_title(ofl->ofl_lml));
for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
Phdr *phdr = &(sgp->sg_phdr);
Xword p_align;
Aliste idx2;
Sym_desc *sdp;
segndx++;
/*
* If an interpreter is required generate a PT_INTERP and
* PT_PHDR program header entry. The PT_PHDR entry describes
* the program header table itself. This information will be
* passed via the aux vector to the interpreter (ld.so.1).
* The program header array is actually part of the first
* loadable segment (and the PT_PHDR entry is the first entry),
* therefore its virtual address isn't known until the first
* loadable segment is processed.
*/
if (phdr->p_type == PT_PHDR) {
if (ofl->ofl_osinterp) {
phdr->p_offset = ehdr->e_phoff;
phdr->p_filesz = phdr->p_memsz = phdrsz;
DBG_CALL(Dbg_seg_entry(ofl, segndx, sgp));
ofl->ofl_phdr[phdrndx++] = *phdr;
}
continue;
}
if (phdr->p_type == PT_INTERP) {
if (ofl->ofl_osinterp) {
intpsgp = sgp;
intpsndx = segndx;
intppndx = phdrndx++;
}
continue;
}
/*
* If we are creating a PT_SUNWDTRACE segment, remember where
* the program header is. The header values are assigned after
* update_osym() has completed and the symbol table addresses
* have been updated.
*/
if (phdr->p_type == PT_SUNWDTRACE) {
if (ofl->ofl_dtracesym &&
((flags & FLG_OF_RELOBJ) == 0)) {
dtracesgp = sgp;
dtracesndx = segndx;
dtracepndx = phdrndx++;
}
continue;
}
/*
* If a hardware/software capabilities section is required,
* generate the PT_SUNWCAP header. Note, as this comes before
* the first loadable segment, we don't yet know its real
* virtual address. This is updated later.
*/
if (phdr->p_type == PT_SUNWCAP) {
if (ofl->ofl_oscap && (ofl->ofl_flags & FLG_OF_PTCAP) &&
((flags & FLG_OF_RELOBJ) == 0)) {
capsgp = sgp;
capsndx = segndx;
cappndx = phdrndx++;
}
continue;
}
/*
* As the dynamic program header occurs after the loadable
* headers in the segment descriptor table, all the address
* information for the .dynamic output section will have been
* figured out by now.
*/
if (phdr->p_type == PT_DYNAMIC) {
if (OFL_ALLOW_DYNSYM(ofl)) {
Shdr *shdr = ofl->ofl_osdynamic->os_shdr;
phdr->p_vaddr = shdr->sh_addr;
phdr->p_offset = shdr->sh_offset;
phdr->p_filesz = shdr->sh_size;
phdr->p_flags = ld_targ.t_m.m_dataseg_perm;
DBG_CALL(Dbg_seg_entry(ofl, segndx, sgp));
ofl->ofl_phdr[phdrndx++] = *phdr;
}
continue;
}
/*
* As the unwind (.eh_frame_hdr) program header occurs after
* the loadable headers in the segment descriptor table, all
* the address information for the .eh_frame output section
* will have been figured out by now.
*/
if (phdr->p_type == PT_SUNW_UNWIND) {
Shdr *shdr;
if (ofl->ofl_unwindhdr == NULL)
continue;
shdr = ofl->ofl_unwindhdr->os_shdr;
phdr->p_flags = PF_R;
phdr->p_vaddr = shdr->sh_addr;
phdr->p_memsz = shdr->sh_size;
phdr->p_filesz = shdr->sh_size;
phdr->p_offset = shdr->sh_offset;
phdr->p_align = shdr->sh_addralign;
phdr->p_paddr = 0;
ofl->ofl_phdr[phdrndx++] = *phdr;
continue;
}
/*
* The sunwstack program is used to convey non-default
* flags for the process stack. Only emit it if it would
* change the default.
*/
if (phdr->p_type == PT_SUNWSTACK) {
if (((flags & FLG_OF_RELOBJ) == 0) &&
((sgp->sg_flags & FLG_SG_DISABLED) == 0))
ofl->ofl_phdr[phdrndx++] = *phdr;
continue;
}
/*
* As the TLS program header occurs after the loadable
* headers in the segment descriptor table, all the address
* information for the .tls output section will have been
* figured out by now.
*/
if (phdr->p_type == PT_TLS) {
Os_desc *tlsosp;
Shdr *lastfileshdr = NULL;
Shdr *firstshdr = NULL, *lastshdr;
Aliste idx;
if (ofl->ofl_ostlsseg == NULL)
continue;
/*
* Scan the output sections that have contributed TLS.
* Remember the first and last so as to determine the
* TLS memory size requirement. Remember the last
* progbits section to determine the TLS data
* contribution, which determines the TLS program
* header filesz.
*/
for (APLIST_TRAVERSE(ofl->ofl_ostlsseg, idx, tlsosp)) {
Shdr *tlsshdr = tlsosp->os_shdr;
if (firstshdr == NULL)
firstshdr = tlsshdr;
if (tlsshdr->sh_type != SHT_NOBITS)
lastfileshdr = tlsshdr;
lastshdr = tlsshdr;
}
phdr->p_flags = PF_R | PF_W;
phdr->p_vaddr = firstshdr->sh_addr;
phdr->p_offset = firstshdr->sh_offset;
phdr->p_align = firstshdr->sh_addralign;
/*
* Determine the initialized TLS data size. This
* address range is from the start of the TLS segment
* to the end of the last piece of initialized data.
*/
if (lastfileshdr)
phdr->p_filesz = lastfileshdr->sh_offset +
lastfileshdr->sh_size - phdr->p_offset;
else
phdr->p_filesz = 0;
/*
* Determine the total TLS memory size. This includes
* all TLS data and TLS uninitialized data. This
* address range is from the start of the TLS segment
* to the memory address of the last piece of
* uninitialized data.
*/
phdr->p_memsz = lastshdr->sh_addr +
lastshdr->sh_size - phdr->p_vaddr;
DBG_CALL(Dbg_seg_entry(ofl, segndx, sgp));
ofl->ofl_phdr[phdrndx] = *phdr;
ofl->ofl_tlsphdr = &ofl->ofl_phdr[phdrndx++];
continue;
}
/*
* If this is an empty segment declaration, it will occur after
* all other loadable segments. As empty segments can be
* defined with fixed addresses, make sure that no loadable
* segments overlap. This might occur as the object evolves
* and the loadable segments grow, thus encroaching upon an
* existing segment reservation.
*
* Segments are only created for dynamic objects, thus this
* checking can be skipped when building a relocatable object.
*/
if (!(flags & FLG_OF_RELOBJ) &&
(sgp->sg_flags & FLG_SG_EMPTY)) {
int i;
Addr v_e;
vaddr = phdr->p_vaddr;
phdr->p_memsz = sgp->sg_length;
DBG_CALL(Dbg_seg_entry(ofl, segndx, sgp));
ofl->ofl_phdr[phdrndx++] = *phdr;
if (phdr->p_type != PT_LOAD)
continue;
v_e = vaddr + phdr->p_memsz;
/*
* Check overlaps
*/
for (i = 0; i < phdrndx - 1; i++) {
Addr p_s = (ofl->ofl_phdr[i]).p_vaddr;
Addr p_e;
if ((ofl->ofl_phdr[i]).p_type != PT_LOAD)
continue;
p_e = p_s + (ofl->ofl_phdr[i]).p_memsz;
if (((p_s <= vaddr) && (p_e > vaddr)) ||
((vaddr <= p_s) && (v_e > p_s)))
ld_eprintf(ofl, ERR_WARNING,
MSG_INTL(MSG_UPD_SEGOVERLAP),
ofl->ofl_name, EC_ADDR(p_e),
sgp->sg_name, EC_ADDR(vaddr));
}
continue;
}
/*
* Having processed any of the special program headers any
* remaining headers will be built to express individual
* segments. Segments are only built if they have output
* section descriptors associated with them (ie. some form of
* input section has been matched to this segment).
*/
if (sgp->sg_osdescs == NULL)
continue;
/*
* Determine the segments offset and size from the section
* information provided from elf_update().
* Allow for multiple NOBITS sections.
*/
osp = sgp->sg_osdescs->apl_data[0];
hshdr = osp->os_shdr;
phdr->p_filesz = 0;
phdr->p_memsz = 0;
phdr->p_offset = offset = hshdr->sh_offset;
nobits = ((hshdr->sh_type == SHT_NOBITS) &&
((sgp->sg_flags & FLG_SG_PHREQ) == 0));
for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
Shdr *shdr = osp->os_shdr;
p_align = 0;
if (shdr->sh_addralign > p_align)
p_align = shdr->sh_addralign;
offset = (Off)S_ROUND(offset, shdr->sh_addralign);
offset += shdr->sh_size;
if (shdr->sh_type != SHT_NOBITS) {
if (nobits) {
ld_eprintf(ofl, ERR_FATAL,
MSG_INTL(MSG_UPD_NOBITS));
return (S_ERROR);
}
phdr->p_filesz = offset - phdr->p_offset;
} else if ((sgp->sg_flags & FLG_SG_PHREQ) == 0)
nobits = TRUE;
}
phdr->p_memsz = offset - hshdr->sh_offset;
/*
* If this is the first loadable segment of a dynamic object,
* or an interpreter has been specified (a static object built
* with an interpreter will still be given a PT_HDR entry), then
* compensate for the elf header and program header array. Both
* of these are actually part of the loadable segment as they
* may be inspected by the interpreter. Adjust the segments
* size and offset accordingly.
*/
if ((_phdr == NULL) && (phdr->p_type == PT_LOAD) &&
((ofl->ofl_osinterp) || (flags & FLG_OF_DYNAMIC)) &&
(!(ofl->ofl_dtflags_1 & DF_1_NOHDR))) {
size = (Addr)S_ROUND((phdrsz + ehdrsz),
hshdr->sh_addralign);
phdr->p_offset -= size;
phdr->p_filesz += size;
phdr->p_memsz += size;
}
/*
* If segment size symbols are required (specified via a
* mapfile) update their value.
*/
for (APLIST_TRAVERSE(sgp->sg_sizesym, idx2, sdp))
sdp->sd_sym->st_value = phdr->p_memsz;
/*
* If no file content has been assigned to this segment (it
* only contains no-bits sections), then reset the offset for
* consistency.
*/
if (phdr->p_filesz == 0)
phdr->p_offset = 0;
/*
* If a virtual address has been specified for this segment
* from a mapfile use it and make sure the previous segment
* does not run into this segment.
*/
if (phdr->p_type == PT_LOAD) {
if ((sgp->sg_flags & FLG_SG_P_VADDR)) {
if (_phdr && (vaddr > phdr->p_vaddr) &&
(phdr->p_type == PT_LOAD))
ld_eprintf(ofl, ERR_WARNING,
MSG_INTL(MSG_UPD_SEGOVERLAP),
ofl->ofl_name, EC_ADDR(vaddr),
sgp->sg_name,
EC_ADDR(phdr->p_vaddr));
vaddr = phdr->p_vaddr;
phdr->p_align = 0;
} else {
vaddr = phdr->p_vaddr =
(Addr)S_ROUND(vaddr, phdr->p_align);
}
}
/*
* Adjust the address offset and p_align if needed.
*/
if (((sgp->sg_flags & FLG_SG_P_VADDR) == 0) &&
((ofl->ofl_dtflags_1 & DF_1_NOHDR) == 0)) {
if (phdr->p_align != 0)
vaddr += phdr->p_offset % phdr->p_align;
else
vaddr += phdr->p_offset;
phdr->p_vaddr = vaddr;
}
/*
* If an interpreter is required set the virtual address of the
* PT_PHDR program header now that we know the virtual address
* of the loadable segment that contains it. Update the
* PT_SUNWCAP header similarly.
*/
if ((_phdr == NULL) && (phdr->p_type == PT_LOAD)) {
_phdr = phdr;
if ((ofl->ofl_dtflags_1 & DF_1_NOHDR) == 0) {
if (ofl->ofl_osinterp)
ofl->ofl_phdr[0].p_vaddr =
vaddr + ehdrsz;
/*
* Finally, if we're creating a dynamic object
* (or a static object in which an interpreter
* is specified) update the vaddr to reflect
* the address of the first section within this
* segment.
*/
if ((ofl->ofl_osinterp) ||
(flags & FLG_OF_DYNAMIC))
vaddr += size;
} else {
/*
* If the DF_1_NOHDR flag was set, and an
* interpreter is being generated, the PT_PHDR
* will not be part of any loadable segment.
*/
if (ofl->ofl_osinterp) {
ofl->ofl_phdr[0].p_vaddr = 0;
ofl->ofl_phdr[0].p_memsz = 0;
ofl->ofl_phdr[0].p_flags = 0;
}
}
}
/*
* Ensure the ELF entry point defaults to zero. Typically, this
* value is overridden in update_oehdr() to one of the standard
* entry points. Historically, this default was set to the
* address of first executable section, but this has since been
* found to be more confusing than it is helpful.
*/
ehdr->e_entry = 0;
DBG_CALL(Dbg_seg_entry(ofl, segndx, sgp));
/*
* Traverse the output section descriptors for this segment so
* that we can update the section headers addresses. We've
* calculated the virtual address of the initial section within
* this segment, so each successive section can be calculated
* based on their offsets from each other.
*/
secndx = 0;
hshdr = 0;
for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
Shdr *shdr = osp->os_shdr;
if (shdr->sh_link)
shdr->sh_link = translate_link(ofl, osp,
shdr->sh_link, MSG_INTL(MSG_FIL_INVSHLINK));
if (shdr->sh_info && (shdr->sh_flags & SHF_INFO_LINK))
shdr->sh_info = translate_link(ofl, osp,
shdr->sh_info, MSG_INTL(MSG_FIL_INVSHINFO));
if (!(flags & FLG_OF_RELOBJ) &&
(phdr->p_type == PT_LOAD)) {
if (hshdr)
vaddr += (shdr->sh_offset -
hshdr->sh_offset);
shdr->sh_addr = vaddr;
hshdr = shdr;
}
DBG_CALL(Dbg_seg_os(ofl, osp, secndx));
secndx++;
}
/*
* Establish the virtual address of the end of the last section
* in this segment so that the next segments offset can be
* calculated from this.
*/
if (hshdr)
vaddr += hshdr->sh_size;
/*
* Output sections for this segment complete. Adjust the
* virtual offset for the last sections size, and make sure we
* haven't exceeded any maximum segment length specification.
*/
if ((sgp->sg_length != 0) && (sgp->sg_length < phdr->p_memsz)) {
ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_UPD_LARGSIZE),
ofl->ofl_name, sgp->sg_name,
EC_XWORD(phdr->p_memsz), EC_XWORD(sgp->sg_length));
return (S_ERROR);
}
if (phdr->p_type == PT_NOTE) {
phdr->p_vaddr = 0;
phdr->p_paddr = 0;
phdr->p_align = 0;
phdr->p_memsz = 0;
}
if ((phdr->p_type != PT_NULL) && !(flags & FLG_OF_RELOBJ))
ofl->ofl_phdr[phdrndx++] = *phdr;
}
/*
* Update any new output sections. When building the initial output
* image, a number of sections were created but left uninitialized (eg.
* .dynsym, .dynstr, .symtab, .symtab, etc.). Here we update these
* sections with the appropriate data. Other sections may still be
* modified via reloc_process().
*
* Copy the interpreter name into the .interp section.
*/
if (ofl->ofl_interp)
(void) strcpy((char *)ofl->ofl_osinterp->os_outdata->d_buf,
ofl->ofl_interp);
/*
* Update the .shstrtab, .strtab and .dynstr sections.
*/
update_ostrtab(ofl->ofl_osshstrtab, ofl->ofl_shdrsttab, 0);
update_ostrtab(ofl->ofl_osstrtab, ofl->ofl_strtab, 0);
update_ostrtab(ofl->ofl_osdynstr, ofl->ofl_dynstrtab, DYNSTR_EXTRA_PAD);
/*
* Build any output symbol tables, the symbols information is copied
* and updated into the new output image.
*/
if ((etext = update_osym(ofl)) == (Addr)S_ERROR)
return (S_ERROR);
/*
* If we have an PT_INTERP phdr, update it now from the associated
* section information.
*/
if (intpsgp) {
Phdr *phdr = &(intpsgp->sg_phdr);
Shdr *shdr = ofl->ofl_osinterp->os_shdr;
phdr->p_vaddr = shdr->sh_addr;
phdr->p_offset = shdr->sh_offset;
phdr->p_memsz = phdr->p_filesz = shdr->sh_size;
phdr->p_flags = PF_R;
DBG_CALL(Dbg_seg_entry(ofl, intpsndx, intpsgp));
ofl->ofl_phdr[intppndx] = *phdr;
}
/*
* If we have a PT_SUNWDTRACE phdr, update it now with the address of
* the symbol. It's only now been updated via update_sym().
*/
if (dtracesgp) {
Phdr *aphdr, *phdr = &(dtracesgp->sg_phdr);
Sym_desc *sdp = ofl->ofl_dtracesym;
phdr->p_vaddr = sdp->sd_sym->st_value;
phdr->p_memsz = sdp->sd_sym->st_size;
/*
* Take permissions from the segment that the symbol is
* associated with.
*/
aphdr = &sdp->sd_isc->is_osdesc->os_sgdesc->sg_phdr;
assert(aphdr);
phdr->p_flags = aphdr->p_flags;
DBG_CALL(Dbg_seg_entry(ofl, dtracesndx, dtracesgp));
ofl->ofl_phdr[dtracepndx] = *phdr;
}
/*
* If we have a PT_SUNWCAP phdr, update it now from the associated
* section information.
*/
if (capsgp) {
Phdr *phdr = &(capsgp->sg_phdr);
Shdr *shdr = ofl->ofl_oscap->os_shdr;
phdr->p_vaddr = shdr->sh_addr;
phdr->p_offset = shdr->sh_offset;
phdr->p_memsz = phdr->p_filesz = shdr->sh_size;
phdr->p_flags = PF_R;
DBG_CALL(Dbg_seg_entry(ofl, capsndx, capsgp));
ofl->ofl_phdr[cappndx] = *phdr;
}
/*
* Update the GROUP sections.
*/
if (update_ogroup(ofl) == S_ERROR)
return (S_ERROR);
/*
* Update Move Table.
*/
if (ofl->ofl_osmove || ofl->ofl_isparexpn)
update_move(ofl);
/*
* Build any output headers, version information, dynamic structure and
* syminfo structure.
*/
if (update_oehdr(ofl) == S_ERROR)
return (S_ERROR);
if (!(flags & FLG_OF_NOVERSEC)) {
if ((flags & FLG_OF_VERDEF) &&
(update_overdef(ofl) == S_ERROR))
return (S_ERROR);
if ((flags & FLG_OF_VERNEED) &&
(update_overneed(ofl) == S_ERROR))
return (S_ERROR);
if (flags & (FLG_OF_VERNEED | FLG_OF_VERDEF))
update_oversym(ofl);
}
if (flags & FLG_OF_DYNAMIC) {
if (update_odynamic(ofl) == S_ERROR)
return (S_ERROR);
}
if (ofl->ofl_ossyminfo) {
if (update_osyminfo(ofl) == S_ERROR)
return (S_ERROR);
}
/*
* Update capabilities information if required.
*/
if (ofl->ofl_oscap)
update_oscap(ofl);
if (ofl->ofl_oscapinfo)
update_oscapinfo(ofl);
/*
* Sanity test: the first and last data byte of a string table
* must be NULL.
*/
assert((ofl->ofl_osshstrtab == NULL) ||
(*((char *)ofl->ofl_osshstrtab->os_outdata->d_buf) == '\0'));
assert((ofl->ofl_osshstrtab == NULL) ||
(*(((char *)ofl->ofl_osshstrtab->os_outdata->d_buf) +
ofl->ofl_osshstrtab->os_outdata->d_size - 1) == '\0'));
assert((ofl->ofl_osstrtab == NULL) ||
(*((char *)ofl->ofl_osstrtab->os_outdata->d_buf) == '\0'));
assert((ofl->ofl_osstrtab == NULL) ||
(*(((char *)ofl->ofl_osstrtab->os_outdata->d_buf) +
ofl->ofl_osstrtab->os_outdata->d_size - 1) == '\0'));
assert((ofl->ofl_osdynstr == NULL) ||
(*((char *)ofl->ofl_osdynstr->os_outdata->d_buf) == '\0'));
assert((ofl->ofl_osdynstr == NULL) ||
(*(((char *)ofl->ofl_osdynstr->os_outdata->d_buf) +
ofl->ofl_osdynstr->os_outdata->d_size - DYNSTR_EXTRA_PAD - 1) ==
'\0'));
/*
* Emit Strtab diagnostics.
*/
DBG_CALL(Dbg_sec_strtab(ofl->ofl_lml, ofl->ofl_osshstrtab,
ofl->ofl_shdrsttab));
DBG_CALL(Dbg_sec_strtab(ofl->ofl_lml, ofl->ofl_osstrtab,
ofl->ofl_strtab));
DBG_CALL(Dbg_sec_strtab(ofl->ofl_lml, ofl->ofl_osdynstr,
ofl->ofl_dynstrtab));
/*
* Initialize the section headers string table index within the elf
* header.
*/
/* LINTED */
if ((shscnndx = elf_ndxscn(ofl->ofl_osshstrtab->os_scn)) <
SHN_LORESERVE) {
ofl->ofl_nehdr->e_shstrndx =
/* LINTED */
(Half)shscnndx;
} else {
/*
* If the STRTAB section index doesn't fit into
* e_shstrndx, then we store it in 'shdr[0].st_link'.
*/
Elf_Scn *scn;
Shdr *shdr0;
if ((scn = elf_getscn(ofl->ofl_elf, 0)) == NULL) {
ld_eprintf(ofl, ERR_ELF, MSG_INTL(MSG_ELF_GETSCN),
ofl->ofl_name);
return (S_ERROR);
}
if ((shdr0 = elf_getshdr(scn)) == NULL) {
ld_eprintf(ofl, ERR_ELF, MSG_INTL(MSG_ELF_GETSHDR),
ofl->ofl_name);
return (S_ERROR);
}
ofl->ofl_nehdr->e_shstrndx = SHN_XINDEX;
shdr0->sh_link = shscnndx;
}
return ((uintptr_t)etext);
}
|