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945ff6e213
On ppc64, we run into:
...
/tmp/ccKXURmw.s: Assembler messages:^M
/tmp/ccKXURmw.s:99: Error: can't resolve \
`_Dmain_end' {.text section} - `_Dmain' {.opd section}^M
compiler exited with status 1
...
The unresolvable entity comes from the .debug_aranges section hardcoded in
watch-loc.c:
...
" .4byte _Dmain \n" // Address
" .4byte _Dmain_end - _Dmain \n" // Length
...
where _Dmain is the function label for function _Dmain, and _Dmain_end is a
label after function _Dmain:
...
int _Dmain (void)
{
asm ("_Dmain_label: .globl _Dmain_label");
return 0;
}
asm ("_Dmain_end: .globl _Dmain_end");
...
The problem is that the two labels are not in the same section, because _Dmain
ends up in the .opd section, which "contains the official procedure
descriptors. A pointer to a function shall reference a procedure descriptor in
this section."
Fix this by using function_range instead to get the length.
Also, fix the address part to not use _Dmain, but instead use the function
start as returned by function_range.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-09-16 Tom de Vries <tdevries@suse.de>
PR testsuite/26617
* gdb.dlang/watch-loc.c: Only add .debug_aranges if
WITH_DEBUG_SECTIONS is defined.
(xstr, str): New macro.
(.debug_aranges): Use DMAIN_START_0/1/2 and DMAIN_LENGTH
to get start and size of _Dmain.
* gdb.dlang/watch-loc.exp: Pass DMAIN_START_0/1/2 and DMAIN_LENGTH
using additional_flags.
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Copyright 2017-2020 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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asm ("_Dmain_end: .globl _Dmain_end");
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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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#ifdef WITH_DEBUG_SECTIONS
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#define xstr(s) str(s)
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#define str(s) #s
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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 " xstr(DMAIN_START_0) xstr(DMAIN_START_1) xstr(DMAIN_START_2) "\n" // Address
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" .4byte " xstr(DMAIN_LENGTH) "\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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#endif
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