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dbghelp: Extend dwarf stack unwinding by reading information out of .debug_frame sections. 

Implement dwarf stack unwinding for i386 CPU.
This commit is contained in:
Eric Pouech 2010-04-01 21:24:20 +02:00 committed by Alexandre Julliard
parent 34ef8d2113
commit 1b68d4e7ce
2 changed files with 48 additions and 7 deletions
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31
dlls/dbghelp/cpu_i386.c
View File

@ -107,6 +107,7 @@ static BOOL i386_stack_walk(struct cpu_stack_walk* csw, LPSTACKFRAME64 frame, CO
DWORD p;
WORD val;
BOOL do_switch;
unsigned deltapc = 1;
/* sanity check */
if (curr_mode >= stm_done) return FALSE;
@ -132,6 +133,7 @@ static BOOL i386_stack_walk(struct cpu_stack_walk* csw, LPSTACKFRAME64 frame, CO
/* Init done */
curr_mode = (frame->AddrPC.Mode == AddrModeFlat) ? stm_32bit : stm_16bit;
deltapc = 0;
/* cur_switch holds address of WOW32Reserved field in TEB in debuggee
* address space
@ -191,6 +193,21 @@ static BOOL i386_stack_walk(struct cpu_stack_walk* csw, LPSTACKFRAME64 frame, CO
* we will get it in the next frame
*/
memset(&frame->AddrBStore, 0, sizeof(frame->AddrBStore));
#ifdef __i386__
if (curr_mode == stm_32bit)
{
DWORD_PTR xframe;
if (dwarf2_virtual_unwind(csw, frame->AddrPC.Offset - deltapc, context, &xframe))
{
frame->AddrStack.Mode = frame->AddrFrame.Mode = frame->AddrReturn.Mode = AddrModeFlat;
frame->AddrStack.Offset = context->Esp = xframe;
frame->AddrFrame.Offset = context->Ebp;
frame->AddrReturn.Offset = context->Eip;
goto done_pep;
}
}
#endif
}
else
{
@ -317,6 +334,18 @@ static BOOL i386_stack_walk(struct cpu_stack_walk* csw, LPSTACKFRAME64 frame, CO
}
else
{
#ifdef __i386__
DWORD_PTR xframe;
if (dwarf2_virtual_unwind(csw, frame->AddrPC.Offset - deltapc, context, &xframe))
{
frame->AddrStack.Mode = frame->AddrFrame.Mode = frame->AddrReturn.Mode = AddrModeFlat;
frame->AddrStack.Offset = context->Esp = xframe;
frame->AddrFrame.Offset = context->Ebp;
frame->AddrReturn.Offset = context->Eip;
goto done_pep;
}
#endif
frame->AddrStack.Offset = frame->AddrFrame.Offset + 2 * sizeof(DWORD);
/* "pop up" previous EBP value */
if (!sw_read_mem(csw, frame->AddrFrame.Offset,
@ -381,6 +410,8 @@ static BOOL i386_stack_walk(struct cpu_stack_walk* csw, LPSTACKFRAME64 frame, CO
sw_read_mem(csw, frame->AddrFrame.Offset + 2 * sizeof(DWORD),
frame->Params, sizeof(frame->Params));
}
goto done_pep; /* just to ensure done_pep label is referenced */
done_pep:
frame->Far = TRUE;
frame->Virtual = TRUE;

24
dlls/dbghelp/dwarf.c
View File

@ -2403,14 +2403,17 @@ static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info*
static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR delta,
dwarf2_traverse_context_t* fde_ctx, dwarf2_traverse_context_t* cie_ctx,
struct frame_info* info)
struct frame_info* info, BOOL in_eh_frame)
{
const unsigned char* ptr_blk;
const unsigned char* cie_ptr;
const unsigned char* last_cie_ptr = (const unsigned char*)~0;
unsigned len, id;
unsigned long start, range;
unsigned cie_id;
const BYTE* start_data = fde_ctx->data;
cie_id = in_eh_frame ? 0 : DW_CIE_ID;
for (; fde_ctx->data + 2 * 4 < fde_ctx->end_data; fde_ctx->data = ptr_blk)
{
/* find the FDE for address addr (skip CIE) */
@ -2418,7 +2421,7 @@ static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR
if (len == 0xffffffff) FIXME("Unsupported yet 64-bit CIEs\n");
ptr_blk = fde_ctx->data + len;
id = dwarf2_parse_u4(fde_ctx);
if (id == 0) /* FIXME DW_CIE_ID */
if (id == cie_id)
{
last_cie_ptr = fde_ctx->data - 8;
/* we need some bits out of the CIE in order to parse all contents */
@ -2428,7 +2431,7 @@ static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR
cie_ctx->word_size = fde_ctx->word_size;
continue;
}
cie_ptr = fde_ctx->data - id - 4;
cie_ptr = (in_eh_frame) ? fde_ctx->data - id - 4 : start_data + id;
if (cie_ptr != last_cie_ptr)
{
last_cie_ptr = cie_ptr;
@ -2436,7 +2439,7 @@ static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR
cie_ctx->word_size = fde_ctx->word_size;
cie_ctx->end_data = cie_ptr + 4;
cie_ctx->end_data = cie_ptr + 4 + dwarf2_parse_u4(cie_ctx);
if (dwarf2_parse_u4(cie_ctx) != 0) /* FIXME DW_CIE_ID */
if (dwarf2_parse_u4(cie_ctx) != cie_id)
{
FIXME("wrong CIE pointer\n");
return FALSE;
@ -2925,10 +2928,17 @@ BOOL dwarf2_virtual_unwind(struct cpu_stack_walk* csw, ULONG_PTR ip, CONTEXT* co
*/
delta = pair.effective->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva -
(DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address;
if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info))
if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, TRUE))
{
TRACE("Couldn't find information for %lx\n", ip);
return FALSE;
fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address;
fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size;
fde_ctx.word_size = modfmt->u.dwarf2_info->word_size;
delta = pair.effective->reloc_delta;
if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, FALSE))
{
TRACE("Couldn't find information for %lx\n", ip);
return FALSE;
}
}
TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",