objdump: Handle 32-bit base address in debug_ranges / debug_loc.
When the DWARF address size is 32-bit, but the host machine is 64-bit,
objdump fails to spot base addresses specified in the .debug_ranges and
.debug_loc lists.
As an example, here is the output when dumping an example .debug_ranges
section with the pre-patched objdump:
Contents of the .debug_ranges section:
Offset Begin End
00000000 ffffffff 00000004 (start > end)
00000000 00000000 00000004
00000000 ffffffff 00000008 (start > end)
00000000 00000000 00000004
00000000 <End of list>
And this is what the same section looks like when dumped with the
patched version of objdump:
Contents of the .debug_ranges section:
Offset Begin End
00000000 ffffffff 00000004 (base address)
00000000 00000004 00000008
00000000 ffffffff 00000008 (base address)
00000000 00000008 0000000c
00000000 <End of list>
binutils/ChangeLog:
* dwarf.c (is_max_address): New function.
(display_loc_list): Remove out of date comment, use
is_max_address.
(display_debug_ranges): Likewise.
binutils/testsuite/ChangeLog:
* binutils-all/objdump.exp: Add test for .debug_ranges decode.
* binutils-all/dw2-ranges.S: New file.
* binutils-all/dw2-ranges.W: New file.
This commit is contained in:
Andrew Burgess
parent
bc301448c0
commit
42bcef4ad6
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@ -1,3 +1,10 @@
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2015-11-30 Andrew Burgess <andrew.burgess@embecosm.com>
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* dwarf.c (is_max_address): New function.
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(display_loc_list): Remove out of date comment, use
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is_max_address.
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(display_debug_ranges): Likewise.
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2015-11-28 Cary Coutant <ccoutant@gmail.com>
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* MAINTAINERS: Update my email address.
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@ -4326,6 +4326,16 @@ display_debug_abbrev (struct dwarf_section *section,
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return 1;
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}
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/* Return true when ADDR is the maximum address, when addresses are
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POINTER_SIZE bytes long. */
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static bfd_boolean
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is_max_address (dwarf_vma addr, unsigned int pointer_size)
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{
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dwarf_vma mask = ~(~(dwarf_vma) 1 << (pointer_size * 8 - 1));
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return ((addr & mask) == mask);
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}
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/* Display a location list from a normal (ie, non-dwo) .debug_loc section. */
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static void
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@ -4380,10 +4390,6 @@ display_loc_list (struct dwarf_section *section,
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printf (" %8.8lx ", off);
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/* Note: we use sign extension here in order to be sure that we can detect
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the -1 escape value. Sign extension into the top 32 bits of a 32-bit
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address will not affect the values that we display since we always show
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hex values, and always the bottom 32-bits. */
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SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, section_end);
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SAFE_BYTE_GET_AND_INC (end, start, pointer_size, section_end);
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@ -4404,7 +4410,8 @@ display_loc_list (struct dwarf_section *section,
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}
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/* Check base address specifiers. */
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if (begin == (dwarf_vma) -1 && end != (dwarf_vma) -1)
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if (is_max_address (begin, pointer_size)
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&& !is_max_address (end, pointer_size))
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{
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base_address = end;
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print_dwarf_vma (begin, pointer_size);
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@ -5202,11 +5209,6 @@ display_debug_ranges (struct dwarf_section *section,
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dwarf_vma begin;
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dwarf_vma end;
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/* Note: we use sign extension here in order to be sure that
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we can detect the -1 escape value. Sign extension into the
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top 32 bits of a 32-bit address will not affect the values
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that we display since we always show hex values, and always
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the bottom 32-bits. */
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SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, finish);
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if (start >= finish)
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break;
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@ -5221,7 +5223,8 @@ display_debug_ranges (struct dwarf_section *section,
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}
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/* Check base address specifiers. */
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if (begin == (dwarf_vma) -1 && end != (dwarf_vma) -1)
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if (is_max_address (begin, pointer_size)
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&& !is_max_address (end, pointer_size))
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{
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base_address = end;
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print_dwarf_vma (begin, pointer_size);
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@ -1,3 +1,9 @@
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2015-11-30 Andrew Burgess <andrew.burgess@embecosm.com>
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* binutils-all/objdump.exp: Add test for .debug_ranges decode.
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* binutils-all/dw2-ranges.S: New file.
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* binutils-all/dw2-ranges.W: New file.
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2015-10-22 Alan Modra <amodra@gmail.com>
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* binutils-all/add-symbol.d: Run test on mips. Support either
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@ -0,0 +1,140 @@
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/* Copyright (C) 2015 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This tests makes use of the .debug_ranges section, especially,
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making sure that the base address encoding scheme is used. */
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/* Dummy function to provide debug information for. */
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.text
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.globl _start
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_start:
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.4byte 0
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.Lbegin_text1:
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.globl func_cu1
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.type func_cu1, %function
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func_cu1:
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.Lbegin_func_cu1:
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.4byte 0
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.Lend_func_cu1:
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.size func_cu1, .-func_cu1
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.Lend_text1:
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.Lbegin_text2:
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.globl func_cu2
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.type func_cu2, %function
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func_cu2:
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.Lbegin_func_cu2:
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.4byte 0
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.Lend_func_cu2:
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.size func_cu2, .-func_cu2
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.Lend_text2:
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/* Debug information */
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.section .debug_info
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.Lcu1_begin:
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/* CU header */
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.4byte .Lcu1_end - .Lcu1_start /* Length of Compilation Unit */
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.Lcu1_start:
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.2byte 2 /* DWARF Version */
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.4byte .Labbrev1_begin /* Offset into abbrev section */
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.byte 4 /* Pointer size */
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/* CU die */
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.uleb128 1 /* Abbrev: DW_TAG_compile_unit */
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.4byte .Lrange1_begin
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.ascii "file1.c\0" /* DW_AT_name */
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.byte 1 /* DW_AT_language (C) */
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/* func_cu1 */
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.uleb128 2 /* Abbrev: DW_TAG_subprogram */
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.ascii "func_cu1\0" /* DW_AT_name */
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.4byte .Ltype_int-.Lcu1_begin /* DW_AT_type */
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.4byte .Lbegin_func_cu1 /* DW_AT_low_pc */
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.4byte .Lend_func_cu1 /* DW_AT_high_pc */
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/* func_cu1 */
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.uleb128 2 /* Abbrev: DW_TAG_subprogram */
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.ascii "func_cu2\0" /* DW_AT_name */
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.4byte .Ltype_int-.Lcu1_begin /* DW_AT_type */
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.4byte .Lbegin_func_cu2 /* DW_AT_low_pc */
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.4byte .Lend_func_cu2 /* DW_AT_high_pc */
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.Ltype_int:
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.uleb128 3 /* Abbrev: DW_TAG_base_type */
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.ascii "int\0" /* DW_AT_name */
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.byte 4 /* DW_AT_byte_size */
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.byte 5 /* DW_AT_encoding */
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.byte 0 /* End of children of CU */
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.Lcu1_end:
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.section .debug_ranges
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.Lrange1_begin:
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.4byte 0xffffffff /* base address marker */
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.4byte .Lbegin_text1 /* base address */
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.4byte 0 /* start offset */
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.4byte .Lend_text1 - .Lbegin_text1 /* end offset */
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.4byte 0xffffffff /* base address marker */
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.4byte .Lbegin_text2 /* base address */
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.4byte 0 /* start offset */
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.4byte .Lend_text2 - .Lbegin_text2 /* end offset */
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.4byte 0 /* End marker (Part 1) */
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.4byte 0 /* End marker (Part 2) */
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.section .debug_abbrev
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.Labbrev1_begin:
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.uleb128 1 /* Abbrev code */
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.uleb128 0x11 /* DW_TAG_compile_unit */
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.byte 1 /* has_children */
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.uleb128 0x55 /* DW_AT_ranges */
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.uleb128 0x17 /* DW_FORM_sec_offset */
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.uleb128 0x3 /* DW_AT_name */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0x13 /* DW_AT_language */
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.uleb128 0xb /* DW_FORM_data1 */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.uleb128 2 /* Abbrev code */
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.uleb128 0x2e /* DW_TAG_subprogram */
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.byte 0 /* has_children */
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.uleb128 0x3 /* DW_AT_name */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0x49 /* DW_AT_type */
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.uleb128 0x13 /* DW_FORM_ref4 */
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.uleb128 0x11 /* DW_AT_low_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.uleb128 0x12 /* DW_AT_high_pc */
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.uleb128 0x1 /* DW_FORM_addr */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.uleb128 3 /* Abbrev code */
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.uleb128 0x24 /* DW_TAG_base_type */
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.byte 0 /* has_children */
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.uleb128 0x3 /* DW_AT_name */
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.uleb128 0x8 /* DW_FORM_string */
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.uleb128 0xb /* DW_AT_byte_size */
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.uleb128 0xb /* DW_FORM_data1 */
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.uleb128 0x3e /* DW_AT_encoding */
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.uleb128 0xb /* DW_FORM_data1 */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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.byte 0x0 /* Terminator */
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@ -0,0 +1,11 @@
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.*: file format .*
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Contents of the \.debug_ranges section:
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Offset Begin End
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00000000 ffffffff 00000004 \(base address\)
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00000000 00000004 00000008
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00000000 ffffffff 00000008 \(base address\)
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00000000 00000008 0000000c
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00000000 <End of list>
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@ -244,6 +244,35 @@ if { ![is_elf_format]
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}
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}
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# Test objdump -W on a file containing debug_ranges information.
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if { ![is_elf_format] } then {
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unsupported "objdump debug_ranges test"
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} elseif { ![binutils_assemble $srcdir/$subdir/dw2-ranges.S tmpdir/dw2-ranges.o] } then {
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fail "objdump debug_ranges test"
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} else {
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if [is_remote host] {
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set ranges_testfile [remote_download host tmpdir/dw2-ranges.o]
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} else {
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set ranges_testfile tmpdir/dw2-ranges.o
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}
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set got [remote_exec host "$OBJDUMP $OBJDUMPFLAGS --dwarf=Ranges $ranges_testfile" "" "/dev/null" "objdump.out"]
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if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
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fail "objdump -W for debug_ranges (reason: unexpected output)"
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send_log $got
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send_log "\n"
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}
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if { [regexp_diff objdump.out $srcdir/$subdir/dw2-ranges.W] } then {
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fail "objdump -W for debug_ranges"
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} else {
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pass "objdump -W for debug_ranges"
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}
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}
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# Options which are not tested: -a -d -D -R -T -x -l --stabs
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# I don't see any generic way to test any of these other than -a.
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# Tests could be written for specific targets, and that should be done
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