Eric Pouech wrote:
running a 16 bit application from bug Bug 5493
now gives an a continuous list of fixme:dbghelp_dwarf:dwarf2_compute_location Unhandled attr op: 75 instead of continuous page faulting between on the lookup. What traces do you need and I will add them to that bug.
does the attached patch help ? A+
From nobody Mon Sep 17 00:00:00 2001
From: Eric Pouech eric.pouech@wanadoo.fr Date: Sat, 1 Jul 2006 11:38:10 +0200 Subject: [PATCH] [DbgHelp]: dwarf & variable with const values
- properly handle variable with const value (ie without
location) in dwarf code
dlls/dbghelp/dwarf.c | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-)
5d683a5bfdb679fe617ced7b9070756c29d45a85 diff --git a/dlls/dbghelp/dwarf.c b/dlls/dbghelp/dwarf.c index 01250a5..a618986 100644 --- a/dlls/dbghelp/dwarf.c +++ b/dlls/dbghelp/dwarf.c @@ -1050,20 +1050,20 @@ static void dwarf2_parse_variable(dwarf2 dwarf2_debug_info_t* di) { struct symt* param_type;
- union attribute loc;
union attribute name, loc, value; BOOL is_pmt = di->abbrev->tag == DW_TAG_formal_parameter;
TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di));
param_type = dwarf2_lookup_type(subpgm->ctx, di);
- if (dwarf2_find_attribute(di, DW_AT_location, &loc))
- dwarf2_find_name(subpgm->ctx, di, &name, "parameter");
- if (dwarf2_find_attribute(di, DW_AT_location, &loc) && loc.block) { union attribute name; union attribute ext; long offset; int in_reg;
dwarf2_find_name(subpgm->ctx, di, &name, "parameter"); offset = dwarf2_compute_location(subpgm->ctx, loc.block, &in_reg);@@ -1094,6 +1094,10 @@ static void dwarf2_parse_variable(dwarf2 break; } }
- if (dwarf2_find_attribute(di, DW_AT_const_value, &value))
- {
FIXME("NIY (const value %08lx for %s\n", value.uvalue, name.string);- } if (is_pmt && subpgm->func && subpgm->func->type) symt_add_function_signature_parameter(subpgm->ctx->module, (struct symt_function_signature*)subpgm->func->type,
This app is downloadable and takes only a few steps to reproduce.
Recompiled with that patch using the CFLAGS="$CFLAGS -gdwarf-2" ./configure and this it the console output
wine: Unhandled page fault on read access to 0x00001d88 at address 0x18e7:0x000018d2 (thread 0010), starting debugger... WineDbg starting on pid 0xa Unhandled exception: page fault on read access to 0x00001d88 in 16-bit code (18e7:18d2). fixme:dbghelp:addr_to_linear Failed to linearize address 101a:00009f0d (mode 0) In 16 bit mode. Register dump: CS:18e7 SS:1b37 DS:191f ES:1a6f FS:003b GS:0033 IP:18d2 SP:540e BP:5416 FLAGS:0206( - 00 - RIP1) AX:500e BX:5422 CX:0000 DX:0000 SI:0000 DI:1c10 Stack dump: 0x1b37:0x540e: 1c10 0000 18e7 1b37 5485 153b 1a9f 0000 0x1b37:0x541e: 0032 0000 5436 0944 18e7 1270 1ba7 0008 0x1b37:0x542e: 1d5c 0000 0032 1b37 5441 1481 1ab7 0008 0323: sel=191f base=7fe30818 limit=00002d9f 16-bit rw- 034d: sel=1a6f base=7deac750 limit=00001fff 16-bit rw- fixme:ntdll:RtlNtStatusToDosErrorNoTeb no mapping for c0000119 Backtrace: =>1 0x18e7:0x18d2 (0x18e7:0x18d2) 2 0x1a9f:0x153b (0x1a9f:0x153b) 3 0x101a:0x9f0d (0x101a:0x9f0d) 4 0x1aef:0x1cdf (0x1aef:0x1cdf) 5 0x1aef:0x1b9e (0x1aef:0x1b9e) 6 0x1b17:0x1447 (0x1b17:0x1447) fixme:dbghelp:elf_load_debug_info_from_map Alpha-support for Dwarf2 information for kernel32<elf> fixme:dbghelp_dwarf:dwarf2_compute_location Unhandled attr op: 75 wine: Unhandled page fault on read access to 0x55ac7760 at address 0x7faba0f8 (thread 0012), starting debugger... WineDbg starting on pid 0x11 Unhandled exception: page fault on read access to 0x55ac7760 in 32-bit code (0x7faba0f8). fixme:dbghelp:elf_load_debug_info_from_map Alpha-support for Dwarf2 information for dbghelp<elf> fixme:dbghelp_dwarf:dwarf2_compute_location Unhandled attr op: 75 wine: Unhandled page fault on read access to 0x55ac7760 at address 0x7faba0f8 (thread 0014), starting debugger... WineDbg starting on pid 0x13 Unhandled exception: page fault on read access to 0x55ac7760 in 32-bit code (0x7faba0f8). fixme:dbghelp:elf_load_debug_info_from_map Alpha-support for Dwarf2 information for dbghelp<elf> fixme:dbghelp_dwarf:dwarf2_compute_location Unhandled attr op: 75 wine: Unhandled page fault on read access to 0x55ac7760 at address 0x7faba0f8 (thread 0016), starting debugger... WineDbg starting on pid 0x15 Unhandled exception: page fault on read access to 0x55ac7760 in 32-bit code (0x7faba0f8). fixme:dbghelp:elf_load_debug_info_from_map Alpha-support for Dwarf2 information for dbghelp<elf> fixme:dbghelp_dwarf:dwarf2_compute_location Unhandled attr op: 75 wine: Unhandled page fault on read access to 0x55ac7760 at address 0x7faba0f8 (thread 0018), starting debugger... WineDbg starting on pid 0x17 Unhandled exception: page fault on read access to 0x55ac7760 in 32-bit code (0x7faba0f8). .... continues until ctrl C