Imported Upstream version 20120410upstream/20120410upstream

1 files changed, 321 insertions, 0 deletions

diff --git a/libdwarf/pro_arange.c b/libdwarf/pro_arange.c
new file mode 100644
index 0000000..3270b37
--- /dev/null
+++ b/libdwarf/pro_arange.c
@@ -0,0 +1,321 @@
+/*
+
+  Copyright (C) 2000,2004 Silicon Graphics, Inc.  All Rights Reserved.
+  Portions Copyright 2011 David Anderson.  All Rights Reserved.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms of version 2.1 of the GNU Lesser 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.  
+
+  Further, this software is distributed without any warranty that it is
+  free of the rightful claim of any third person regarding infringement 
+  or the like.  Any license provided herein, whether implied or 
+  otherwise, applies only to this software file.  Patent licenses, if
+  any, provided herein do not apply to combinations of this program with 
+  other software, or any other product whatsoever.  
+
+  You should have received a copy of the GNU Lesser 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.
+
+  Contact information:  Silicon Graphics, Inc., 1500 Crittenden Lane,
+  Mountain View, CA 94043, or:
+
+  http://www.sgi.com
+
+  For further information regarding this notice, see:
+
+  http://oss.sgi.com/projects/GenInfo/NoticeExplan
+
+*/
+
+
+
+#include "config.h"
+#include "libdwarfdefs.h"
+#include <stdio.h>
+#include <string.h>
+#ifdef HAVE_ELFACCESS_H
+#include <elfaccess.h>
+#endif
+#include "pro_incl.h"
+#include "pro_arange.h"
+#include "pro_section.h"
+#include "pro_reloc.h"
+
+
+
+/*  This function adds another address range 
+    to the list of address ranges for the
+    given Dwarf_P_Debug.  It returns 0 on error,
+    and 1 otherwise.  */
+Dwarf_Unsigned
+dwarf_add_arange(Dwarf_P_Debug dbg,
+    Dwarf_Addr begin_address,
+    Dwarf_Unsigned length,
+    Dwarf_Signed symbol_index, Dwarf_Error * error)
+{
+    return dwarf_add_arange_b(dbg, begin_address, length, symbol_index,
+        /* end_symbol_index */ 0,
+        /* offset_from_end_sym */ 0,
+        error);
+}
+
+/*  This function adds another address range 
+    to the list of address ranges for the
+    given Dwarf_P_Debug.  It returns 0 on error,
+    and 1 otherwise.  */
+Dwarf_Unsigned
+dwarf_add_arange_b(Dwarf_P_Debug dbg,
+    Dwarf_Addr begin_address,
+    Dwarf_Unsigned length,
+    Dwarf_Unsigned symbol_index,
+    Dwarf_Unsigned end_symbol_index,
+    Dwarf_Addr offset_from_end_sym, Dwarf_Error * error)
+{
+    Dwarf_P_Arange arange;
+
+    if (dbg == NULL) {
+        _dwarf_p_error(NULL, error, DW_DLE_DBG_NULL);
+        return (0);
+    }
+
+    arange = (Dwarf_P_Arange)
+        _dwarf_p_get_alloc(dbg, sizeof(struct Dwarf_P_Arange_s));
+    if (arange == NULL) {
+        _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+        return (0);
+    }
+
+    arange->ag_begin_address = begin_address;
+    arange->ag_length = length;
+    arange->ag_symbol_index = symbol_index;
+    arange->ag_end_symbol_index = end_symbol_index;
+    arange->ag_end_symbol_offset = offset_from_end_sym;
+
+    if (dbg->de_arange == NULL)
+        dbg->de_arange = dbg->de_last_arange = arange;
+    else {
+        dbg->de_last_arange->ag_next = arange;
+        dbg->de_last_arange = arange;
+    }
+    dbg->de_arange_count++;
+
+    return (1);
+}
+
+
+int
+_dwarf_transform_arange_to_disk(Dwarf_P_Debug dbg, Dwarf_Error * error)
+{
+    /* Total num of bytes in .debug_aranges section. */
+    Dwarf_Unsigned arange_num_bytes = 0;
+
+    /*  Adjustment to align the start of the actual address ranges on a
+        boundary aligned with twice the address size. */
+    Dwarf_Small remainder = 0;
+
+    /*  Total number of bytes excluding the length field. */
+    Dwarf_Unsigned adjusted_length = 0;
+
+    /*  Points to first byte of .debug_aranges buffer. */
+    Dwarf_Small *arange = 0;
+
+    /*  Fills in the .debug_aranges buffer. */
+    Dwarf_Small *arange_ptr = 0;
+
+    /*  Scans the list of address ranges provided by user. */
+    Dwarf_P_Arange given_arange = 0;
+
+    /*  Used to fill in 0. */
+    const Dwarf_Signed big_zero = 0;
+
+    int extension_word_size = dbg->de_64bit_extension ? 4 : 0;
+    int uword_size = dbg->de_offset_size;
+    int upointer_size = dbg->de_pointer_size;
+    int res = 0;
+
+
+    /* ***** BEGIN CODE ***** */
+
+    /* Size of the .debug_aranges section header. */
+    arange_num_bytes = extension_word_size + 
+        uword_size +       /* Size of length field.  */
+        sizeof(Dwarf_Half) +    /* Size of version field. */
+        uword_size +            /* Size of .debug_info offset. */
+        sizeof(Dwarf_Small) +   /* Size of address size field. */
+        sizeof(Dwarf_Small);    /* Size of segment size field. */
+
+    /*  Adjust the size so that the set of aranges begins on a boundary
+        that aligned with twice the address size.  This is a Libdwarf
+        requirement. */
+    remainder = arange_num_bytes % (2 * upointer_size);
+    if (remainder != 0)
+        arange_num_bytes += (2 * upointer_size) - remainder;
+
+
+    /* Add the bytes for the actual address ranges. */
+    arange_num_bytes += upointer_size * 2 * (dbg->de_arange_count + 1);
+
+    GET_CHUNK(dbg, dbg->de_elf_sects[DEBUG_ARANGES],
+        arange, (unsigned long) arange_num_bytes, error);
+    arange_ptr = arange;
+    if (arange == NULL) {
+        _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+        return (0);
+    }
+    if (extension_word_size) {
+        Dwarf_Word x = DISTINGUISHED_VALUE;
+
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+            (const void *) &x,
+            sizeof(x), extension_word_size);
+        arange_ptr += extension_word_size;
+    }
+
+    /* Write the total length of .debug_aranges section. */
+    adjusted_length = arange_num_bytes - uword_size
+        - extension_word_size;
+    {
+        Dwarf_Unsigned du = adjusted_length;
+
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+            (const void *) &du, sizeof(du), uword_size);
+        arange_ptr += uword_size;
+    }
+
+    /* Write the version as 2 bytes. */
+    {
+        Dwarf_Half verstamp = CURRENT_VERSION_STAMP;
+
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+            (const void *) &verstamp,
+            sizeof(verstamp), sizeof(Dwarf_Half));
+        arange_ptr += sizeof(Dwarf_Half);
+    }
+
+
+    /* Write the .debug_info offset.  This is always 0. */
+    WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+        (const void *) &big_zero,
+        sizeof(big_zero), uword_size);
+    arange_ptr += uword_size;
+
+    {
+        unsigned long count = dbg->de_arange_count + 1;
+        int res = 0;
+
+        if (dbg->de_reloc_pair) {
+            count = (3 * dbg->de_arange_count) + 1;
+        }
+        /*  The following is a small optimization: not needed for
+            correctness */
+        res = _dwarf_pro_pre_alloc_n_reloc_slots(dbg,
+            DEBUG_ARANGES, count);
+        if (res != DW_DLV_OK) {
+            _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+            return (0);
+        }
+    }
+
+    /* reloc for .debug_info */
+    res = dbg->de_reloc_name(dbg,
+        DEBUG_ARANGES,
+        extension_word_size +
+        uword_size + sizeof(Dwarf_Half),
+        dbg->de_sect_name_idx[DEBUG_INFO],
+        dwarf_drt_data_reloc, uword_size);
+
+    /* Write the size of addresses. */
+    *arange_ptr = dbg->de_pointer_size;
+    arange_ptr++;
+
+    /*  Write the size of segment addresses. This is zero for MIPS
+        architectures. */
+    *arange_ptr = 0;
+    arange_ptr++;
+
+    /*  Skip over the padding to align the start of the actual address
+        ranges to twice the address size. */
+    if (remainder != 0)
+        arange_ptr += (2 * upointer_size) - remainder;
+
+
+
+
+
+    /*  The arange address, length are pointer-size fields of the target 
+        machine. */
+    for (given_arange = dbg->de_arange; given_arange != NULL;
+        given_arange = given_arange->ag_next) {
+
+        /* Write relocation record for beginning of address range. */
+        res = dbg->de_reloc_name(dbg, DEBUG_ARANGES, 
+            arange_ptr - arange,       /* r_offset */
+            (long) given_arange->ag_symbol_index,
+            dwarf_drt_data_reloc, upointer_size);
+        if (res != DW_DLV_OK) {
+            _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+            return (0);
+        }
+
+        /* Copy beginning address of range. */
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+            (const void *) &given_arange->ag_begin_address,
+            sizeof(given_arange->ag_begin_address),
+            upointer_size);
+        arange_ptr += upointer_size;
+
+        if (dbg->de_reloc_pair &&
+            given_arange->ag_end_symbol_index != 0 &&
+            given_arange->ag_length == 0) {
+            /*  symbolic reloc, need reloc for length What if we really
+                know the length? If so, should use the other part of
+                'if'. */
+            Dwarf_Unsigned val;
+
+            res = dbg->de_reloc_pair(dbg, DEBUG_ARANGES, 
+                arange_ptr - arange,   /* r_offset */
+                given_arange->ag_symbol_index,
+                given_arange->ag_end_symbol_index,
+                dwarf_drt_first_of_length_pair,
+                upointer_size);
+            if (res != DW_DLV_OK) {
+                _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+                return (0);
+            }
+
+            /*  arange pre-calc so assem text can do .word end - begin
+                + val (gets val from stream) */
+            val = given_arange->ag_end_symbol_offset -
+                given_arange->ag_begin_address;
+            WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                (const void *) &val,
+                sizeof(val), upointer_size);
+            arange_ptr += upointer_size;
+
+        } else {
+            /* plain old length to copy, no relocation at all */
+            WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                (const void *) &given_arange->ag_length,
+                sizeof(given_arange->ag_length),
+                upointer_size);
+            arange_ptr += upointer_size;
+        }
+    }
+
+    WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+        (const void *) &big_zero,
+        sizeof(big_zero), upointer_size);
+
+    arange_ptr += upointer_size;
+    WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+        (const void *) &big_zero,
+        sizeof(big_zero), upointer_size);
+    return (int) dbg->de_n_debug_sect;
+}