75f06e9dc5
When running gdb.dlang/watch-loc.exp with target board cc-with-debug-names, we run into: ... FAIL: gdb.dlang/watch-loc.exp: disassemble _Dmain (GDB internal error) ... in more detail: ... (gdb) disassemble _Dmain gdb/dwarf2read.c:5293: internal-error: \ compunit_symtab* dw2_find_pc_sect_compunit_symtab(objfile*, \ bound_minimal_symbol, CORE_ADDR, obj_section*, int): \ Assertion `result != NULL' failed. ... The problem is that the .debug_aranges section in watch-loc.c contains a debug_info_offset which is set to 0: ... asm ( " .pushsection .debug_aranges,\"\",%progbits\n" " .4byte .Laranges_end - .Laranges_start\n" ".Laranges_start:\n" " .2byte 0x2\n" " .4byte 0\n" ... while the compilation unit at offset 0 in the .debug_section in the executable is in fact not the compilation unit generated from watch-loc-dw.S. [ Note: this is a non-trivial test-case. The file watch-loc-dw.S contains a .debug_info section, but not an .debug_aranges section or any actual code. The file watch-loc.c contains code and a .debug_aranges section, but no other debug section. So, the intent for the .debug_aranges section in watch-loc.c is to refer to a compilation unit in the .debug_info section in watch-loc-dw.S. ] This happens when linked in object files contain dwarf info and are placed in the .debug_info section before the compilation units generated from watch-loc.c and watch-loc-dw.S. Fix this by defining the debug_info_offset field using a label .Lcu1_begin that defines the start of an empty .debug_section compilation unit: ... asm ( + " .pushsection .debug_info,\"\",%progbits\n" + ".Lcu1_begin:" + " .popsection\n" " .pushsection .debug_aranges,\"\",%progbits\n" " .4byte .Laranges_end - .Laranges_start \n" ".Laranges_start:\n" " .2byte 0x2\n" - " .4byte 0\n" + " .4byte .Lcu1_begin\n" ... which during linking merges with the start of the .debug_info section of watch-loc-dw.S. Tested on x86_64-linux with native, cc-with-gdb-index and cc-with-debug-names. gdb/testsuite/ChangeLog: 2019-05-07 Tom de Vries <tdevries@suse.de> PR testsuite/24522 * gdb.dlang/watch-loc.c: Fix debug_info_offset in .debug_aranges section.
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/* Copyright 2017-2019 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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/* DWARF will describe these contents as being inside a D module. */
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typedef struct tstruct
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{
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} tstruct;
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tstruct my_data;
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int _Dmain (void)
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{
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asm ("_Dmain_label: .globl _Dmain_label");
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return 0;
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}
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int
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main (void)
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{
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return _Dmain ();
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}
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/* The .debug_names-based index support depends on .debug_aranges
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generated by GCC. (.gdb_index includes a gdb-generated map
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instead.) */
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asm (
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" .pushsection .debug_info,\"\",%progbits \n"
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".Lcu1_begin:"
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" .popsection \n"
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" .pushsection .debug_aranges,\"\",%progbits \n"
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" .4byte .Laranges_end - .Laranges_start \n" // Length of Address Ranges Info
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".Laranges_start: \n"
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" .2byte 0x2 \n" // DWARF Version
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" .4byte .Lcu1_begin\n" // .Ldebug_info0 - Offset of Compilation Unit Info
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" .byte 4 \n" // Size of Address
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" .byte 0 \n" // Size of Segment Descriptor
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" .2byte 0 \n" // Pad to 16 byte boundary
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" .2byte 0 \n"
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" .4byte _Dmain \n" // Address
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" .4byte 0x1000 \n" // Length
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" .4byte 0 \n"
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" .4byte 0 \n"
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".Laranges_end: \n"
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" .popsection \n"
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);
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