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