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diff --git a/dwarfgen/dwarfgen.cc b/dwarfgen/dwarfgen.cc
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+/*
+ Copyright (C) 2010-2011 David Anderson.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of version 2 of the GNU General Public License as
+ published by the Free Software Foundation.
+
+ This program is distributed in the hope that it would be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write the Free Software Foundation, Inc., 51
+ Franklin Street - Fifth Floor, Boston MA 02110-1301, USA.
+
+*/
+// dwarfgen.cc
+//
+// Using some information source, create a tree of dwarf
+// information (speaking of a DIE tree).
+// Turn the die tree into dwarfdata using libdwarf producer
+// and write the resulting data in an object file.
+// It is a bit inconsistent in error handling just to
+// demonstrate the various possibilities using the producer
+// library.
+//
+// dwarfgen [-t def|obj|txt] [-o outpath] [-c cunum] path
+
+// where -t means what sort of input to read
+// def means predefined (no input is read, the output
+// is based on some canned setups built into dwarfgen).
+// 'path' is ignored in this case. This is the default.
+//
+// obj means 'path' is required, it is the object file to
+// read (the dwarf sections are duplicated in the output file)
+//
+// txt means 'path' is required, path must contain plain text
+// (in a form rather like output by dwarfdump)
+// that defines the dwarf that is to be output.
+//
+// where -o means specify the pathname of the output object. If not
+// supplied testout.o is used as the default output path.
+// where -c supplies a CU number of the obj input to output
+// because the dwarf producer wants just one CU.
+// Default is -1 which won't match anything.
+
+#include "config.h"
+#include <unistd.h>
+#include <stdlib.h> // for exit
+#include <iostream>
+#include <sstream>
+#include <iomanip>
+#include <string>
+#include <list>
+#include <vector>
+#include <string.h> // For memset etc
+#include <sys/stat.h> //open
+#include <fcntl.h> //open
+#include "general.h"
+#include "elf.h"
+#include "gelf.h"
+#include "strtabdata.h"
+#include "dwarf.h"
+#include "libdwarf.h"
+#include "irepresentation.h"
+#include "ireptodbg.h"
+#include "createirepfrombinary.h"
+
+using std::string;
+using std::cout;
+using std::cerr;
+using std::endl;
+using std::vector;
+
+static void write_object_file(Dwarf_P_Debug dbg, IRepresentation &irep);
+static void write_text_section(Elf * elf);
+static void write_generated_dbg(Dwarf_P_Debug dbg,Elf * elf,
+ IRepresentation &irep);
+
+static string outfile("testout.o");
+static string infile;
+static enum WhichInputSource { OptNone, OptReadText,OptReadBin,OptPredefined}
+ whichinput(OptPredefined);
+
+
+// This is a global so thet CallbackFunc can get to it
+// If we used the dwarf_producer_init_c() user_data pointer
+// creatively we would not need a global.
+static IRepresentation Irep;
+
+static Elf * elf = 0;
+static Elf32_Ehdr * ehp = 0;
+static strtabdata secstrtab;
+
+// loff_t is signed for some reason (strange) but we make offsets unsigned.
+#define LOFFTODWUNS(x) ( (Dwarf_Unsigned)(x))
+
+class SectionFromDwarf {
+public:
+ std::string name_;
+ Dwarf_Unsigned section_name_itself_;
+ ElfSymIndex section_name_symidx_;
+ int size_;
+ Dwarf_Unsigned type_;
+ Dwarf_Unsigned flags_;
+ Dwarf_Unsigned link_;
+ Dwarf_Unsigned info_;
+private:
+ ElfSectIndex elf_sect_index_;
+ Dwarf_Unsigned lengthWrittenToElf_;
+public:
+ Dwarf_Unsigned getNextOffset() { return lengthWrittenToElf_; }
+ void setNextOffset(Dwarf_Unsigned v) { lengthWrittenToElf_ = v; }
+
+ unsigned getSectionNameSymidx() {
+ return section_name_symidx_.getSymIndex(); };
+ SectionFromDwarf():section_name_itself_(0),
+ section_name_symidx_(0),
+ size_(0),type_(0),flags_(0),
+ link_(0), info_(0), elf_sect_index_(0),
+ lengthWrittenToElf_(0) {} ;
+ ~SectionFromDwarf() {};
+ void setSectIndex(ElfSectIndex v) { elf_sect_index_ = v;}
+ ElfSectIndex getSectIndex() const { return elf_sect_index_;}
+ SectionFromDwarf(const std::string&name,
+ int size,Dwarf_Unsigned type,Dwarf_Unsigned flags,
+ Dwarf_Unsigned link, Dwarf_Unsigned info):
+ name_(name),
+ size_(size),type_(type),flags_(flags),
+ link_(link), info_(info), elf_sect_index_(0),
+ lengthWrittenToElf_(0) {
+ // Now create section name string section.
+ section_name_itself_ = secstrtab.addString(name.c_str());
+ ElfSymbols& es = Irep.getElfSymbols();
+ // Now creat a symbol for the section name.
+ // (which has its own string table)
+ section_name_symidx_ = es.addElfSymbol(0,name);
+ } ;
+};
+
+vector<SectionFromDwarf> dwsectab;
+
+static ElfSectIndex create_dw_elf(SectionFromDwarf &ds);
+
+static SectionFromDwarf & FindMySection(const ElfSectIndex & elf_section_index)
+{
+ for(unsigned i =0; i < dwsectab.size(); ++i) {
+ if(elf_section_index.getSectIndex() !=
+ dwsectab[i].getSectIndex().getSectIndex()) {
+ continue;
+ }
+ return dwsectab[i];
+ }
+ cerr << "Unable to find my dw sec data for elf section " <<
+ elf_section_index.getSectIndex() << endl;
+ exit(1);
+}
+
+static unsigned
+createnamestr(unsigned strtabstroff)
+{
+ Elf_Scn * strscn =elf_newscn(elf);
+ if(!strscn) {
+ cerr << "Unable to elf_newscn() on " << outfile << endl;
+ exit(1);
+ }
+ Elf_Data* shstr =elf_newdata(strscn);
+ if(!shstr) {
+ cerr << "Unable to elf_newdata() on " << outfile << endl;
+ exit(1);
+ }
+ shstr->d_buf = secstrtab.exposedata();
+ shstr->d_type = ELF_T_BYTE;
+ shstr->d_size = secstrtab.exposelen();
+ shstr->d_off = 0;
+ shstr->d_align = 1;
+ shstr->d_version = EV_CURRENT;
+
+ Elf32_Shdr * strshdr = elf32_getshdr(strscn);
+ if(!strshdr) {
+ cerr << "Unable to elf_getshdr() on " << outfile << endl;
+ exit(1);
+ }
+ strshdr->sh_name = strtabstroff;
+ strshdr->sh_type= SHT_STRTAB;
+ strshdr->sh_flags = SHF_STRINGS;
+ strshdr->sh_addr = 0;
+ strshdr->sh_offset = 0;
+ strshdr->sh_size = 0;
+ strshdr->sh_link = 0;
+ strshdr->sh_info = 0;
+ strshdr->sh_addralign = 1;
+ strshdr->sh_entsize = 0;
+ return elf_ndxscn(strscn);
+}
+
+
+// This functional interface is defined by libdwarf.
+int CallbackFunc(
+ char* name,
+ int size,
+ Dwarf_Unsigned type,
+ Dwarf_Unsigned flags,
+ Dwarf_Unsigned link,
+ Dwarf_Unsigned info,
+ Dwarf_Unsigned* sect_name_symbol_index,
+ void * user_data,
+ int* error)
+{
+ // Create an elf section.
+ // If the data is relocations, we suppress the generation
+ // of a section when we intend to do the relocations
+ // ourself (quite normal for dwarfgen but would
+ // be really surprising for a normal compiler
+ // back end using the producer code).
+
+ // The section name appears both in the section strings .shstrtab and
+ // in the elf symtab .symtab and its strings .strtab.
+
+ if (0 == strncmp(name,".rel",4)) {
+ // It is relocation, create no section!
+ return 0;
+ }
+ SectionFromDwarf ds(name,size,type,flags,link,info) ;
+ *sect_name_symbol_index = ds.getSectionNameSymidx();
+ ElfSectIndex createdsec = create_dw_elf(ds);
+
+ // Do all the data creation before pushing (copying) ds onto dwsectab!
+ dwsectab.push_back(ds);
+ return createdsec.getSectIndex();
+}
+
+static ElfSectIndex
+create_dw_elf(SectionFromDwarf &ds)
+{
+ Elf_Scn * scn =elf_newscn(elf);
+ if(!scn) {
+ cerr << "Unable to elf_newscn() on " << ds.name_ << endl;
+ exit(1);
+ }
+ Elf32_Shdr * shdr = elf32_getshdr(scn);
+ if(!shdr) {
+ cerr << "Unable to elf_getshdr() on " << ds.name_ << endl;
+ exit(1);
+ }
+ shdr->sh_name = ds.section_name_itself_;
+ shdr->sh_type = ds.type_;
+ shdr->sh_flags = ds.flags_;
+ shdr->sh_addr = 0;
+ shdr->sh_offset = 0;
+ shdr->sh_size = ds.size_;
+ shdr->sh_link = ds.link_;
+ shdr->sh_info = ds.info_;
+ shdr->sh_addralign = 1;
+ shdr->sh_entsize = 0;
+ ElfSectIndex si(elf_ndxscn(scn));
+ ds.setSectIndex(si);
+ return si;
+}
+
+// Default error handler of libdwarf producer code.
+void ErrorHandler(Dwarf_Error err,Dwarf_Ptr errarg)
+{
+ // FIXME do better error handling
+ cerr <<"Giving up, encountered an error" << endl;
+ exit(1);
+}
+
+
+static void
+setinput(enum WhichInputSource *src,
+ const string &type,
+ bool *pathreq)
+{
+ if(type == "txt") {
+ *src = OptReadText;
+ *pathreq = true;
+ return;
+ } else if (type == "obj") {
+ *src = OptReadBin;
+ *pathreq = true;
+ return;
+ } else if (type == "def") {
+ *src = OptPredefined;
+ *pathreq = false;
+ return;
+ }
+ cout << "Giving up, only txt obj or def accepted after -t" << endl;
+ exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+
+
+ int opt;
+ bool pathrequired(false);
+ long cu_of_input_we_output = -1;
+ while((opt=getopt(argc,argv,"o:t:c:")) != -1) {
+ switch(opt) {
+ case 'c':
+ // At present we can only create a single
+ // cu in the output of the libdwarf producer.
+ cu_of_input_we_output = atoi(optarg);
+ break;
+ case 't':
+ setinput(&whichinput,optarg,&pathrequired);
+ break;
+ case 'o':
+ outfile = optarg;
+ break;
+ case '?':
+ cerr << "Invalid quest? option input " << endl;
+ exit(1);
+
+ default:
+ cerr << "Invalid option input " << endl;
+ exit(1);
+ }
+ }
+ if ( (optind >= argc) && pathrequired) {
+ cerr << "Expected argument after options! Giving up." << endl;
+ exit(EXIT_FAILURE);
+ }
+
+ if(pathrequired) {
+ infile = argv[optind];
+ }
+
+ if(whichinput == OptReadBin) {
+ createIrepFromBinary(infile,Irep);
+ } else if (whichinput == OptReadText) {
+ cerr << "text read not supported yet" << endl;
+ exit(EXIT_FAILURE);
+ } else if (whichinput == OptPredefined) {
+ cerr << "predefined not supported yet" << endl;
+ exit(EXIT_FAILURE);
+ } else {
+ cerr << "Impossible: unknown input style." << endl;
+ exit(EXIT_FAILURE);
+ }
+
+ // Example will return error value thru 'err' pointer
+ // and return DW_DLV_BADADDR if there is an error.
+ int ptrsize = DW_DLC_SIZE_32;
+ Dwarf_Ptr errarg = 0;
+ Dwarf_Error err = 0;
+ // We use DW_DLC_SYMBOLIC_RELOCATIONS so we can
+ // read the relocations and do our own relocating.
+ // See calls of dwarf_get_relocation_info().
+ Dwarf_P_Debug dbg = dwarf_producer_init_c(
+ DW_DLC_WRITE|ptrsize|DW_DLC_SYMBOLIC_RELOCATIONS,
+ CallbackFunc,
+ 0,
+ errarg,
+ 0, /* we are not using user_data, so pass in 0 */
+ &err);
+ if(dbg == reinterpret_cast<Dwarf_P_Debug>(DW_DLV_BADADDR)) {
+ cerr << "Failed init_b" << endl;
+ exit(EXIT_FAILURE);
+ }
+
+ transform_irep_to_dbg(dbg,Irep,cu_of_input_we_output);
+
+ write_object_file(dbg,Irep);
+ // Example calls ErrorHandler if there is an error
+ // (which does not return, see above)
+ // so no need to test for error.
+ dwarf_producer_finish( dbg, 0);
+
+ return 0;
+}
+
+static void
+write_object_file(Dwarf_P_Debug dbg, IRepresentation &irep)
+{
+ int mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+ int fd = open(outfile.c_str(),O_WRONLY|O_CREAT|O_TRUNC, mode);
+ if(fd < 0 ) {
+ cerr << "Unable to open " << outfile <<
+ " for writing." << endl;
+ exit(1);
+ }
+
+ if(elf_version(EV_CURRENT) == EV_NONE) {
+ cerr << "Bad elf_version" << endl;
+ exit(1);
+ }
+
+ Elf_Cmd cmd = ELF_C_WRITE;
+ elf = elf_begin(fd,cmd,0);
+ if(!elf) {
+ cerr << "Unable to elf_begin() on " << outfile << endl;
+ exit(1);
+ }
+ ehp = elf32_newehdr(elf);
+ if(!ehp) {
+ cerr << "Unable to elf_newehdr() on " << outfile << endl;
+ exit(1);
+ }
+ ehp->e_ident[EI_MAG0] = ELFMAG0;
+ ehp->e_ident[EI_MAG1] = ELFMAG1;
+ ehp->e_ident[EI_MAG2] = ELFMAG2;
+ ehp->e_ident[EI_MAG3] = ELFMAG3;
+ ehp->e_ident[EI_CLASS] = ELFCLASS32;
+ ehp->e_ident[EI_DATA] = ELFDATA2LSB;
+ ehp->e_ident[EI_VERSION] = EV_CURRENT;
+ ehp->e_machine = EM_386;
+ ehp->e_type = ET_EXEC;
+ ehp->e_version = EV_CURRENT;
+
+ unsigned strtabstroff = secstrtab.addString(".shstrtab");
+
+ // an object section with fake .text data (just as an example).
+ write_text_section(elf);
+
+ write_generated_dbg(dbg,elf,Irep);
+
+ // Now create section name string section.
+ unsigned shstrindex = createnamestr(strtabstroff);
+ ehp->e_shstrndx = shstrindex;
+
+ off_t ures = elf_update(elf,cmd);
+ if(ures == (off_t)(-1LL)) {
+ cerr << "Unable to elf_update() on " << outfile << endl;
+ int eer = elf_errno();
+ cerr << "Error is " << eer << " " << elf_errmsg(eer) << endl;
+ exit(1);
+ }
+ cout << " output image size in bytes " << ures << endl;
+
+ elf_end(elf);
+ close(fd);
+}
+
+
+// an object section with fake .text data (just as an example).
+static void
+write_text_section(Elf * elf)
+{
+ unsigned osecnameoff = secstrtab.addString(".text");
+ Elf_Scn * scn1 =elf_newscn(elf);
+ if(!scn1) {
+ cerr << "Unable to elf_newscn() on " << outfile << endl;
+ exit(1);
+ }
+
+ Elf_Data* ed1 =elf_newdata(scn1);
+ if(!ed1) {
+ cerr << "Unable to elf_newdata() on " << outfile << endl;
+ exit(1);
+ }
+ const char *d = "data in section";
+ ed1->d_buf = (void *)d;
+ ed1->d_type = ELF_T_BYTE;
+ ed1->d_size = strlen(d) +1;
+ ed1->d_off = 0;
+ ed1->d_align = 4;
+ ed1->d_version = EV_CURRENT;
+ Elf32_Shdr * shdr1 = elf32_getshdr(scn1);
+ if(!shdr1) {
+ cerr << "Unable to elf_getshdr() on " << outfile << endl;
+ exit(1);
+ }
+ shdr1->sh_name = osecnameoff;
+ shdr1->sh_type= SHT_PROGBITS;
+ shdr1->sh_flags = 0;
+ shdr1->sh_addr = 0;
+ shdr1->sh_offset = 0;
+ shdr1->sh_size = 0;
+ shdr1->sh_link = 0;
+ shdr1->sh_info = 0;
+ shdr1->sh_addralign = 1;
+ shdr1->sh_entsize = 0;
+}
+static void
+InsertDataIntoElf(Dwarf_Signed d,Dwarf_P_Debug dbg,Elf *elf)
+{
+ Dwarf_Signed elf_section_index = 0;
+ Dwarf_Unsigned length = 0;
+ Dwarf_Ptr bytes = dwarf_get_section_bytes(dbg,d,
+ &elf_section_index,&length,0);
+
+ Elf_Scn *scn = elf_getscn(elf,elf_section_index);
+ if(!scn) {
+ cerr << "Unable to elf_getscn on disk transform # " << d << endl;
+ exit(1);
+ }
+
+ ElfSectIndex si(elf_section_index);
+ SectionFromDwarf & sfd = FindMySection(si);
+
+ Elf_Data* ed =elf_newdata(scn);
+ if(!ed) {
+ cerr << "elf_newdata died on transformed index " << d << endl;
+ exit(1);
+ }
+ ed->d_buf = bytes;
+ ed->d_type = ELF_T_BYTE;
+ ed->d_size = length;
+ ed->d_off = sfd.getNextOffset();
+ sfd.setNextOffset(ed->d_off + length);
+ ed->d_align = 1;
+ ed->d_version = EV_CURRENT;
+ cout << "Inserted " << length << " bytes into elf section index " <<
+ elf_section_index << endl;
+}
+
+#if 0
+static string
+printable_rel_type(unsigned char reltype)
+{
+ enum Dwarf_Rel_Type t = (enum Dwarf_Rel_Type)reltype;
+ switch(t) {
+ case dwarf_drt_none:
+ return "dwarf_drt_none";
+ case dwarf_drt_data_reloc:
+ return "dwarf_drt_data_reloc";
+ case dwarf_drt_segment_rel:
+ return "dwarf_drt_segment_rel";
+ case dwarf_drt_first_of_length_pair:
+ return "dwarf_drt_first_of_length_pair";
+ case dwarf_drt_second_of_length_pair:
+ return "dwarf_drt_second_of_length_pair";
+ default:
+ break;
+ }
+ return "drt-unknown (impossible case)";
+}
+#endif
+
+static Dwarf_Unsigned
+FindSymbolValue(ElfSymIndex symi,IRepresentation &irep)
+{
+ ElfSymbols & syms = irep.getElfSymbols();
+ ElfSymbol & es = syms.getElfSymbol(symi);
+ Dwarf_Unsigned symv = es.getSymbolValue();
+ return symv;
+}
+
+static void
+bitreplace(char *buf, Dwarf_Unsigned newval,
+ size_t newvalsize,int length)
+{
+ if(length == 4) {
+ uint32_t my4 = newval;
+ uint32_t * p = reinterpret_cast<uint32_t *>(buf );
+ uint32_t oldval = *p;
+ *p = oldval + my4;
+ } else if (length == 8) {
+ uint64_t my8 = newval;
+ uint64_t * p = reinterpret_cast<uint64_t *>(buf );
+ uint64_t oldval = *p;
+ *p = oldval + my8;
+ } else {
+ cerr << " Relocation is length " << length <<
+ " which we do not yet handle." << endl;
+ exit(1);
+ }
+}
+
+// This remembers nothing, so is dreadfully slow.
+static char *
+findelfbuf(Elf *elf,Elf_Scn *scn,Dwarf_Unsigned offset, unsigned length)
+{
+ Elf_Data * edbase = 0;
+ Elf_Data * ed = elf_getdata(scn,edbase);
+ unsigned bct = 0;
+ for (;ed; ed = elf_getdata(scn,ed)) {
+ bct++;
+ if(offset >= LOFFTODWUNS(ed->d_off + ed->d_size) ) {
+ continue;
+ }
+ if(offset < LOFFTODWUNS(ed->d_off)) {
+ cerr << " Relocation at offset " <<
+ offset << " cannot be accomplished, no buffer. "
+ << endl;
+ exit(1);
+ }
+ Dwarf_Unsigned localoff = offset - ed->d_off;
+ if((localoff + length) > ed->d_size) {
+ cerr << " Relocation at offset " <<
+ offset << " cannot be accomplished, size mismatch. "
+ << endl;
+ exit(1);
+ }
+ char *lclptr = reinterpret_cast<char *>(ed->d_buf) + localoff;
+ return lclptr;
+ }
+ cerr << " Relocation at offset " << offset <<
+ " cannot be accomplished, past end of buffers" << endl;
+ return 0;
+
+}
+
+static void
+write_generated_dbg(Dwarf_P_Debug dbg,Elf * elf,IRepresentation &irep)
+{
+ Dwarf_Error err = 0;
+ Dwarf_Signed sectioncount =
+ dwarf_transform_to_disk_form(dbg,0);
+
+ Dwarf_Signed d = 0;
+ for(d = 0; d < sectioncount ; ++d) {
+ InsertDataIntoElf(d,dbg,elf);
+ }
+
+ // Since we are emitting in final form sometimes, we may
+ // do relocation processing here or we may
+ // instead emit relocation records into the object file.
+ // The following is for DW_DLC_SYMBOLIC_RELOCATIONS.
+ Dwarf_Unsigned reloc_sections_count = 0;
+ int drd_version = 0;
+ int res = dwarf_get_relocation_info_count(dbg,&reloc_sections_count,
+ &drd_version,&err);
+ if( res != DW_DLV_OK) {
+ cerr << "Error getting relocation info count." << endl;
+ exit(1);
+
+ }
+ cout << "Relocations sections count= " << reloc_sections_count <<
+ " relversion=" << drd_version << endl;
+ for( Dwarf_Unsigned ct = 0; ct < reloc_sections_count ; ++ct) {
+ // elf_section_index is the elf index of the relocations
+ // themselves.
+ Dwarf_Signed elf_section_index = 0;
+ // elf_section_index_link is the elf index of the section
+ // the relocations apply to.
+ Dwarf_Signed elf_section_index_link = 0;
+ // relocation_buffer_count is the number of relocations
+ // of this section.
+ Dwarf_Unsigned relocation_buffer_count = 0;
+ Dwarf_Relocation_Data reld;
+ res = dwarf_get_relocation_info(dbg,&elf_section_index,
+ &elf_section_index_link,
+ &relocation_buffer_count,
+ &reld,&err);
+ if (res != DW_DLV_OK) {
+ cerr << "Error getting relocation record " <<
+ ct << "." << endl;
+ exit(1);
+ }
+ ElfSectIndex si(elf_section_index_link);
+ cout << "Relocs for sec " << ct << " elf-sec=" << elf_section_index <<
+ " link=" << elf_section_index_link <<
+ " bufct=" << relocation_buffer_count << endl;
+ Elf_Scn *scn = elf_getscn(elf,si.getSectIndex());
+ if(!scn) {
+ cerr << "Unable to elf_getscn # " << si.getSectIndex() << endl;
+ exit(1);
+ }
+
+ for (Dwarf_Unsigned r = 0; r < relocation_buffer_count; ++r) {
+ Dwarf_Relocation_Data rec = reld+r;
+ ElfSymIndex symi(rec->drd_symbol_index);
+ Dwarf_Unsigned newval = FindSymbolValue(symi,irep);
+ char *buf_to_update = findelfbuf(elf,scn,
+ rec->drd_offset,rec->drd_length);
+ if(buf_to_update) {
+ bitreplace(buf_to_update, newval,sizeof(newval),
+ rec->drd_length);
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 13:51:13 +0000