reactos/wine
1
0
Fork 0
mirror of https://github.com/reactos/wine.git synced 2024-11-27 05:30:30 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
03f7bbdbf7
wine/dlls/dbghelp/cpu_i386.c
Alexandre Julliard e42d1a8cc1 dbghelp: Don't require a 16-bit stack for StackWalk.
2010-01-27 18:46:06 +01:00

413 lines
15 KiB
C
Raw Blame History

/*
* File cpu_i386.c
*
* Copyright (C) 2009-2009, Eric Pouech.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "dbghelp_private.h"
#include "wine/winbase16.h"
#include "winternl.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
#define STEP_FLAG 0x00000100 /* single step flag */
#define V86_FLAG 0x00020000
#define IS_VM86_MODE(ctx) (ctx->EFlags & V86_FLAG)
#ifdef __i386__
static ADDRESS_MODE get_selector_type(HANDLE hThread, const CONTEXT* ctx, WORD sel)
{
LDT_ENTRY le;
if (IS_VM86_MODE(ctx)) return AddrModeReal;
/* null or system selector */
if (!(sel & 4) || ((sel >> 3) < 17)) return AddrModeFlat;
if (hThread && GetThreadSelectorEntry(hThread, sel, &le))
return le.HighWord.Bits.Default_Big ? AddrMode1632 : AddrMode1616;
/* selector doesn't exist */
return -1;
}
static unsigned i386_build_addr(HANDLE hThread, const CONTEXT* ctx, ADDRESS64* addr,
unsigned seg, unsigned long offset)
{
addr->Mode = AddrModeFlat;
addr->Segment = seg;
addr->Offset = offset;
if (seg)
{
switch (addr->Mode = get_selector_type(hThread, ctx, seg))
{
case AddrModeReal:
case AddrMode1616:
addr->Offset &= 0xffff;
break;
case AddrModeFlat:
case AddrMode1632:
break;
default:
return FALSE;
}
}
return TRUE;
}
#endif
static unsigned i386_get_addr(HANDLE hThread, const CONTEXT* ctx,
enum cpu_addr ca, ADDRESS64* addr)
{
#ifdef __i386__
switch (ca)
{
case cpu_addr_pc: return i386_build_addr(hThread, ctx, addr, ctx->SegCs, ctx->Eip);
case cpu_addr_stack: return i386_build_addr(hThread, ctx, addr, ctx->SegSs, ctx->Esp);
case cpu_addr_frame: return i386_build_addr(hThread, ctx, addr, ctx->SegSs, ctx->Ebp);
}
#endif
return FALSE;
}
enum st_mode {stm_start, stm_32bit, stm_16bit, stm_done};
/* indexes in Reserved array */
#define __CurrentMode 0
#define __CurrentSwitch 1
#define __NextSwitch 2
#define curr_mode (frame->Reserved[__CurrentMode])
#define curr_switch (frame->Reserved[__CurrentSwitch])
#define next_switch (frame->Reserved[__NextSwitch])
static BOOL i386_stack_walk(struct cpu_stack_walk* csw, LPSTACKFRAME64 frame)
{
STACK32FRAME frame32;
STACK16FRAME frame16;
char ch;
ADDRESS64 tmp;
DWORD p;
WORD val;
BOOL do_switch;
/* sanity check */
if (curr_mode >= stm_done) return FALSE;
TRACE("Enter: PC=%s Frame=%s Return=%s Stack=%s Mode=%s cSwitch=%p nSwitch=%p\n",
wine_dbgstr_addr(&frame->AddrPC),
wine_dbgstr_addr(&frame->AddrFrame),
wine_dbgstr_addr(&frame->AddrReturn),
wine_dbgstr_addr(&frame->AddrStack),
curr_mode == stm_start ? "start" : (curr_mode == stm_16bit ? "16bit" : "32bit"),
(void*)(DWORD_PTR)curr_switch, (void*)(DWORD_PTR)next_switch);
if (curr_mode == stm_start)
{
THREAD_BASIC_INFORMATION info;
if ((frame->AddrPC.Mode == AddrModeFlat) &&
(frame->AddrFrame.Mode != AddrModeFlat))
{
WARN("Bad AddrPC.Mode / AddrFrame.Mode combination\n");
goto done_err;
}
/* Init done */
curr_mode = (frame->AddrPC.Mode == AddrModeFlat) ? stm_32bit : stm_16bit;
/* cur_switch holds address of WOW32Reserved field in TEB in debuggee
* address space
*/
if (NtQueryInformationThread(csw->hThread, ThreadBasicInformation, &info,
sizeof(info), NULL) == STATUS_SUCCESS)
{
curr_switch = (unsigned long)info.TebBaseAddress + FIELD_OFFSET(TEB, WOW32Reserved);
if (!sw_read_mem(csw, curr_switch, &p, sizeof(p)))
{
WARN("Can't read TEB:WOW32Reserved\n");
goto done_err;
}
next_switch = p;
if (!next_switch) /* no 16-bit stack */
{
curr_switch = 0;
}
else if (curr_mode == stm_16bit)
{
if (!sw_read_mem(csw, next_switch, &frame32, sizeof(frame32)))
{
WARN("Bad stack frame %p\n", (void*)(DWORD_PTR)next_switch);
goto done_err;
}
curr_switch = (DWORD)frame32.frame16;
tmp.Mode = AddrMode1616;
tmp.Segment = SELECTOROF(curr_switch);
tmp.Offset = OFFSETOF(curr_switch);
if (!sw_read_mem(csw, sw_xlat_addr(csw, &tmp), &ch, sizeof(ch)))
curr_switch = 0xFFFFFFFF;
}
else
{
tmp.Mode = AddrMode1616;
tmp.Segment = SELECTOROF(next_switch);
tmp.Offset = OFFSETOF(next_switch);
p = sw_xlat_addr(csw, &tmp);
if (!sw_read_mem(csw, p, &frame16, sizeof(frame16)))
{
WARN("Bad stack frame 0x%08x\n", p);
goto done_err;
}
curr_switch = (DWORD_PTR)frame16.frame32;
if (!sw_read_mem(csw, curr_switch, &ch, sizeof(ch)))
curr_switch = 0xFFFFFFFF;
}
}
else
/* FIXME: this will allow to work when we're not attached to a live target,
* but the 16 <=> 32 switch facility won't be available.
*/
curr_switch = 0;
frame->AddrReturn.Mode = frame->AddrStack.Mode = (curr_mode == stm_16bit) ? AddrMode1616 : AddrModeFlat;
/* don't set up AddrStack on first call. Either the caller has set it up, or
* we will get it in the next frame
*/
memset(&frame->AddrBStore, 0, sizeof(frame->AddrBStore));
}
else
{
if (frame->AddrFrame.Offset == 0) goto done_err;
if (frame->AddrFrame.Mode == AddrModeFlat)
{
assert(curr_mode == stm_32bit);
do_switch = curr_switch && frame->AddrFrame.Offset >= curr_switch;
}
else
{
assert(curr_mode == stm_16bit);
do_switch = curr_switch &&
frame->AddrFrame.Segment == SELECTOROF(curr_switch) &&
frame->AddrFrame.Offset >= OFFSETOF(curr_switch);
}
if (do_switch)
{
if (curr_mode == stm_16bit)
{
if (!sw_read_mem(csw, next_switch, &frame32, sizeof(frame32)))
{
WARN("Bad stack frame %p\n", (void*)(DWORD_PTR)next_switch);
goto done_err;
}
frame->AddrPC.Mode = AddrModeFlat;
frame->AddrPC.Segment = 0;
frame->AddrPC.Offset = frame32.retaddr;
frame->AddrFrame.Mode = AddrModeFlat;
frame->AddrFrame.Segment = 0;
frame->AddrFrame.Offset = frame32.ebp;
frame->AddrStack.Mode = AddrModeFlat;
frame->AddrStack.Segment = 0;
frame->AddrReturn.Mode = AddrModeFlat;
frame->AddrReturn.Segment = 0;
next_switch = curr_switch;
tmp.Mode = AddrMode1616;
tmp.Segment = SELECTOROF(next_switch);
tmp.Offset = OFFSETOF(next_switch);
p = sw_xlat_addr(csw, &tmp);
if (!sw_read_mem(csw->hProcess, p, &frame16, sizeof(frame16)))
{
WARN("Bad stack frame 0x%08x\n", p);
goto done_err;
}
curr_switch = (DWORD_PTR)frame16.frame32;
curr_mode = stm_32bit;
if (!sw_read_mem(csw, curr_switch, &ch, sizeof(ch)))
curr_switch = 0;
}
else
{
tmp.Mode = AddrMode1616;
tmp.Segment = SELECTOROF(next_switch);
tmp.Offset = OFFSETOF(next_switch);
p = sw_xlat_addr(csw, &tmp);
if (!sw_read_mem(csw, p, &frame16, sizeof(frame16)))
{
WARN("Bad stack frame 0x%08x\n", p);
goto done_err;
}
TRACE("Got a 16 bit stack switch:"
"\n\tframe32: %08lx"
"\n\tedx:%08x ecx:%08x ebp:%08x"
"\n\tds:%04x es:%04x fs:%04x gs:%04x"
"\n\tcall_from_ip:%08x module_cs:%04x relay=%08x"
"\n\tentry_ip:%04x entry_point:%08x"
"\n\tbp:%04x ip:%04x cs:%04x\n",
(unsigned long)frame16.frame32,
frame16.edx, frame16.ecx, frame16.ebp,
frame16.ds, frame16.es, frame16.fs, frame16.gs,
frame16.callfrom_ip, frame16.module_cs, frame16.relay,
frame16.entry_ip, frame16.entry_point,
frame16.bp, frame16.ip, frame16.cs);
frame->AddrPC.Mode = AddrMode1616;
frame->AddrPC.Segment = frame16.cs;
frame->AddrPC.Offset = frame16.ip;
frame->AddrFrame.Mode = AddrMode1616;
frame->AddrFrame.Segment = SELECTOROF(next_switch);
frame->AddrFrame.Offset = frame16.bp;
frame->AddrStack.Mode = AddrMode1616;
frame->AddrStack.Segment = SELECTOROF(next_switch);
frame->AddrReturn.Mode = AddrMode1616;
frame->AddrReturn.Segment = frame16.cs;
next_switch = curr_switch;
if (!sw_read_mem(csw, next_switch, &frame32, sizeof(frame32)))
{
WARN("Bad stack frame %p\n", (void*)(DWORD_PTR)next_switch);
goto done_err;
}
curr_switch = (DWORD)frame32.frame16;
tmp.Mode = AddrMode1616;
tmp.Segment = SELECTOROF(curr_switch);
tmp.Offset = OFFSETOF(curr_switch);
if (!sw_read_mem(csw, sw_xlat_addr(csw, &tmp), &ch, sizeof(ch)))
curr_switch = 0;
curr_mode = stm_16bit;
}
}
else
{
frame->AddrPC = frame->AddrReturn;
if (curr_mode == stm_16bit)
{
frame->AddrStack.Offset = frame->AddrFrame.Offset + 2 * sizeof(WORD);
/* "pop up" previous BP value */
if (!sw_read_mem(csw, sw_xlat_addr(csw, &frame->AddrFrame),
&val, sizeof(WORD)))
goto done_err;
frame->AddrFrame.Offset = val;
}
else
{
frame->AddrStack.Offset = frame->AddrFrame.Offset + 2 * sizeof(DWORD);
/* "pop up" previous EBP value */
if (!sw_read_mem(csw, frame->AddrFrame.Offset,
&frame->AddrFrame.Offset, sizeof(DWORD)))
goto done_err;
}
}
}
if (curr_mode == stm_16bit)
{
unsigned int i;
p = sw_xlat_addr(csw, &frame->AddrFrame);
if (!sw_read_mem(csw, p + sizeof(WORD), &val, sizeof(WORD)))
goto done_err;
frame->AddrReturn.Offset = val;
/* get potential cs if a far call was used */
if (!sw_read_mem(csw, p + 2 * sizeof(WORD), &val, sizeof(WORD)))
goto done_err;
if (frame->AddrFrame.Offset & 1)
frame->AddrReturn.Segment = val; /* far call assumed */
else
{
/* not explicitly marked as far call,
* but check whether it could be anyway
*/
if ((val & 7) == 7 && val != frame->AddrReturn.Segment)
{
LDT_ENTRY le;
if (GetThreadSelectorEntry(csw->hThread, val, &le) &&
(le.HighWord.Bits.Type & 0x08)) /* code segment */
{
/* it is very uncommon to push a code segment cs as
* a parameter, so this should work in most cases
*/
frame->AddrReturn.Segment = val;
}
}
}
frame->AddrFrame.Offset &= ~1;
/* we "pop" parameters as 16 bit entities... of course, this won't
* work if the parameter is in fact bigger than 16bit, but
* there's no way to know that here
*/
for (i = 0; i < sizeof(frame->Params) / sizeof(frame->Params[0]); i++)
{
sw_read_mem(csw, p + (2 + i) * sizeof(WORD), &val, sizeof(val));
frame->Params[i] = val;
}
}
else
{
if (!sw_read_mem(csw, frame->AddrFrame.Offset + sizeof(DWORD),
&frame->AddrReturn.Offset, sizeof(DWORD)))
{
WARN("Cannot read new frame offset %p\n",
(void*)(DWORD_PTR)(frame->AddrFrame.Offset + (int)sizeof(DWORD)));
goto done_err;
}
sw_read_mem(csw, frame->AddrFrame.Offset + 2 * sizeof(DWORD),
frame->Params, sizeof(frame->Params));
}
frame->Far = TRUE;
frame->Virtual = TRUE;
p = sw_xlat_addr(csw, &frame->AddrPC);
if (p && sw_module_base(csw, p))
frame->FuncTableEntry = sw_table_access(csw, p);
else
frame->FuncTableEntry = NULL;
TRACE("Leave: PC=%s Frame=%s Return=%s Stack=%s Mode=%s cSwitch=%p nSwitch=%p FuncTable=%p\n",
wine_dbgstr_addr(&frame->AddrPC),
wine_dbgstr_addr(&frame->AddrFrame),
wine_dbgstr_addr(&frame->AddrReturn),
wine_dbgstr_addr(&frame->AddrStack),
curr_mode == stm_start ? "start" : (curr_mode == stm_16bit ? "16bit" : "32bit"),
(void*)(DWORD_PTR)curr_switch, (void*)(DWORD_PTR)next_switch, frame->FuncTableEntry);
return TRUE;
done_err:
curr_mode = stm_done;
return FALSE;
}
struct cpu cpu_i386 = {
IMAGE_FILE_MACHINE_I386,
4,
i386_get_addr,
i386_stack_walk,
};
Reference in New Issue View Git Blame Copy Permalink