| /* | |
| * 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, 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, | |
| }; |