550 lines
19 KiB
C
550 lines
19 KiB
C
/*
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* Debugger i386 specific functions
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*
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* Copyright 2004 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "debugger.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
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#ifdef __i386__
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/* debugger/db_disasm.c */
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extern void be_i386_disasm_one_insn(ADDRESS* addr, int display);
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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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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 (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 void* be_i386_linearize(HANDLE hThread, const ADDRESS* addr)
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{
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LDT_ENTRY le;
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switch (addr->Mode)
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{
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case AddrModeReal:
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return (void*)((DWORD)(LOWORD(addr->Segment) << 4) + addr->Offset);
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case AddrMode1632:
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if (!(addr->Segment & 4) || ((addr->Segment >> 3) < 17))
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return (void*)addr->Offset;
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/* fall through */
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case AddrMode1616:
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if (!GetThreadSelectorEntry(hThread, addr->Segment, &le)) return NULL;
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return (void*)((le.HighWord.Bits.BaseHi << 24) +
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(le.HighWord.Bits.BaseMid << 16) + le.BaseLow + addr->Offset);
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break;
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case AddrModeFlat:
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return (void*)addr->Offset;
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}
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return NULL;
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}
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static unsigned be_i386_build_addr(HANDLE hThread, const CONTEXT* ctx, ADDRESS* 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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addr->Mode = get_selector_type(hThread, ctx, seg);
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switch (addr->Mode)
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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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addr->Mode = -1;
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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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static unsigned be_i386_get_addr(HANDLE hThread, const CONTEXT* ctx,
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enum be_cpu_addr bca, ADDRESS* addr)
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{
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switch (bca)
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{
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case be_cpu_addr_pc:
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return be_i386_build_addr(hThread, ctx, addr, ctx->SegCs, ctx->Eip);
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case be_cpu_addr_stack:
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return be_i386_build_addr(hThread, ctx, addr, ctx->SegSs, ctx->Esp);
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case be_cpu_addr_frame:
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return be_i386_build_addr(hThread, ctx, addr, ctx->SegSs, ctx->Ebp);
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}
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return FALSE;
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}
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static void be_i386_single_step(CONTEXT* ctx, unsigned enable)
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{
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if (enable) ctx->EFlags |= STEP_FLAG;
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else ctx->EFlags &= ~STEP_FLAG;
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}
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static void be_i386_print_context(HANDLE hThread, const CONTEXT* ctx)
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{
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char buf[33];
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char* pt;
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dbg_printf("Register dump:\n");
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/* First get the segment registers out of the way */
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dbg_printf(" CS:%04x SS:%04x DS:%04x ES:%04x FS:%04x GS:%04x",
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(WORD)ctx->SegCs, (WORD)ctx->SegSs,
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(WORD)ctx->SegDs, (WORD)ctx->SegEs,
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(WORD)ctx->SegFs, (WORD)ctx->SegGs);
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strcpy(buf, " - 00 - - - ");
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pt = buf + strlen(buf) - 1;
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if (ctx->EFlags & 0x00000001) *pt-- = 'C'; /* Carry Flag */
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if (ctx->EFlags & 0x00000002) *pt-- = '1';
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if (ctx->EFlags & 0x00000004) *pt-- = 'P'; /* Parity Flag */
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if (ctx->EFlags & 0x00000008) *pt-- = '-';
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if (ctx->EFlags & 0x00000010) *pt-- = 'A'; /* Auxiliary Carry Flag */
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if (ctx->EFlags & 0x00000020) *pt-- = '-';
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if (ctx->EFlags & 0x00000040) *pt-- = 'Z'; /* Zero Flag */
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if (ctx->EFlags & 0x00000080) *pt-- = 'S'; /* Sign Flag */
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if (ctx->EFlags & 0x00000100) *pt-- = 'T'; /* Trap/Trace Flag */
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if (ctx->EFlags & 0x00000200) *pt-- = 'I'; /* Interupt Enable Flag */
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if (ctx->EFlags & 0x00000400) *pt-- = 'D'; /* Direction Indicator */
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if (ctx->EFlags & 0x00000800) *pt-- = 'O'; /* Overflow flags */
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if (ctx->EFlags & 0x00001000) *pt-- = '1'; /* I/O Privilege Level */
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if (ctx->EFlags & 0x00002000) *pt-- = '1'; /* I/O Privilege Level */
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if (ctx->EFlags & 0x00004000) *pt-- = 'N'; /* Nested Task Flag */
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if (ctx->EFlags & 0x00008000) *pt-- = '-';
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if (ctx->EFlags & 0x00010000) *pt-- = 'R'; /* Resume Flag */
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if (ctx->EFlags & 0x00020000) *pt-- = 'V'; /* Vritual Mode Flag */
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if (ctx->EFlags & 0x00040000) *pt-- = 'a'; /* Alignment Check Flag */
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switch (get_selector_type(hThread, ctx, ctx->SegCs))
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{
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case AddrMode1616:
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case AddrModeReal:
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dbg_printf("\n IP:%04x SP:%04x BP:%04x FLAGS:%04x(%s)\n",
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LOWORD(ctx->Eip), LOWORD(ctx->Esp),
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LOWORD(ctx->Ebp), LOWORD(ctx->EFlags), buf);
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dbg_printf(" AX:%04x BX:%04x CX:%04x DX:%04x SI:%04x DI:%04x\n",
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LOWORD(ctx->Eax), LOWORD(ctx->Ebx),
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LOWORD(ctx->Ecx), LOWORD(ctx->Edx),
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LOWORD(ctx->Esi), LOWORD(ctx->Edi));
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break;
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case AddrModeFlat:
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case AddrMode1632:
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dbg_printf("\n EIP:%08lx ESP:%08lx EBP:%08lx EFLAGS:%08lx(%s)\n",
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ctx->Eip, ctx->Esp, ctx->Ebp, ctx->EFlags, buf);
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dbg_printf(" EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n",
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ctx->Eax, ctx->Ebx, ctx->Ecx, ctx->Edx);
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dbg_printf(" ESI:%08lx EDI:%08lx\n",
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ctx->Esi, ctx->Edi);
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break;
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}
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}
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static void be_i386_print_segment_info(HANDLE hThread, const CONTEXT* ctx)
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{
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if (get_selector_type(hThread, ctx, ctx->SegCs) == AddrMode1616)
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{
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info_win32_segments(ctx->SegDs >> 3, 1);
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if (ctx->SegEs != ctx->SegDs) info_win32_segments(ctx->SegEs >> 3, 1);
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}
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info_win32_segments(ctx->SegFs >> 3, 1);
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}
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static struct dbg_internal_var be_i386_ctx[] =
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{
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{CV_REG_AL, "AL", (DWORD*)FIELD_OFFSET(CONTEXT, Eax), dbg_itype_unsigned_char_int},
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{CV_REG_CL, "CL", (DWORD*)FIELD_OFFSET(CONTEXT, Ecx), dbg_itype_unsigned_char_int},
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{CV_REG_DL, "DL", (DWORD*)FIELD_OFFSET(CONTEXT, Edx), dbg_itype_unsigned_char_int},
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{CV_REG_BL, "BL", (DWORD*)FIELD_OFFSET(CONTEXT, Ebx), dbg_itype_unsigned_char_int},
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{CV_REG_AH, "AH", (DWORD*)(FIELD_OFFSET(CONTEXT, Eax)+1), dbg_itype_unsigned_char_int},
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{CV_REG_CH, "CH", (DWORD*)(FIELD_OFFSET(CONTEXT, Ecx)+1), dbg_itype_unsigned_char_int},
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{CV_REG_DH, "DH", (DWORD*)(FIELD_OFFSET(CONTEXT, Edx)+1), dbg_itype_unsigned_char_int},
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{CV_REG_BH, "BH", (DWORD*)(FIELD_OFFSET(CONTEXT, Ebx)+1), dbg_itype_unsigned_char_int},
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{CV_REG_AX, "AX", (DWORD*)FIELD_OFFSET(CONTEXT, Eax), dbg_itype_unsigned_short_int},
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{CV_REG_CX, "CX", (DWORD*)FIELD_OFFSET(CONTEXT, Ecx), dbg_itype_unsigned_short_int},
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{CV_REG_DX, "DX", (DWORD*)FIELD_OFFSET(CONTEXT, Edx), dbg_itype_unsigned_short_int},
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{CV_REG_BX, "BX", (DWORD*)FIELD_OFFSET(CONTEXT, Ebx), dbg_itype_unsigned_short_int},
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{CV_REG_SP, "SP", (DWORD*)FIELD_OFFSET(CONTEXT, Esp), dbg_itype_unsigned_short_int},
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{CV_REG_BP, "BP", (DWORD*)FIELD_OFFSET(CONTEXT, Ebp), dbg_itype_unsigned_short_int},
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{CV_REG_SI, "SI", (DWORD*)FIELD_OFFSET(CONTEXT, Esi), dbg_itype_unsigned_short_int},
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{CV_REG_DI, "DI", (DWORD*)FIELD_OFFSET(CONTEXT, Edi), dbg_itype_unsigned_short_int},
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{CV_REG_EAX, "EAX", (DWORD*)FIELD_OFFSET(CONTEXT, Eax), dbg_itype_unsigned_int},
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{CV_REG_ECX, "ECX", (DWORD*)FIELD_OFFSET(CONTEXT, Ecx), dbg_itype_unsigned_int},
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{CV_REG_EDX, "EDX", (DWORD*)FIELD_OFFSET(CONTEXT, Edx), dbg_itype_unsigned_int},
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{CV_REG_EBX, "EBX", (DWORD*)FIELD_OFFSET(CONTEXT, Ebx), dbg_itype_unsigned_int},
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{CV_REG_ESP, "ESP", (DWORD*)FIELD_OFFSET(CONTEXT, Esp), dbg_itype_unsigned_int},
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{CV_REG_EBP, "EBP", (DWORD*)FIELD_OFFSET(CONTEXT, Ebp), dbg_itype_unsigned_int},
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{CV_REG_ESI, "ESI", (DWORD*)FIELD_OFFSET(CONTEXT, Esi), dbg_itype_unsigned_int},
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{CV_REG_EDI, "EDI", (DWORD*)FIELD_OFFSET(CONTEXT, Edi), dbg_itype_unsigned_int},
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{CV_REG_ES, "ES", (DWORD*)FIELD_OFFSET(CONTEXT, SegEs), dbg_itype_unsigned_short_int},
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{CV_REG_CS, "CS", (DWORD*)FIELD_OFFSET(CONTEXT, SegCs), dbg_itype_unsigned_short_int},
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{CV_REG_SS, "SS", (DWORD*)FIELD_OFFSET(CONTEXT, SegSs), dbg_itype_unsigned_short_int},
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{CV_REG_DS, "DS", (DWORD*)FIELD_OFFSET(CONTEXT, SegDs), dbg_itype_unsigned_short_int},
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{CV_REG_FS, "FS", (DWORD*)FIELD_OFFSET(CONTEXT, SegFs), dbg_itype_unsigned_short_int},
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{CV_REG_GS, "GS", (DWORD*)FIELD_OFFSET(CONTEXT, SegGs), dbg_itype_unsigned_short_int},
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{CV_REG_IP, "IP", (DWORD*)FIELD_OFFSET(CONTEXT, Eip), dbg_itype_unsigned_short_int},
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{CV_REG_FLAGS, "FLAGS", (DWORD*)FIELD_OFFSET(CONTEXT, EFlags), dbg_itype_unsigned_short_int},
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{CV_REG_EIP, "EIP", (DWORD*)FIELD_OFFSET(CONTEXT, Eip), dbg_itype_unsigned_int},
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{CV_REG_EFLAGS, "EFLAGS", (DWORD*)FIELD_OFFSET(CONTEXT, EFlags), dbg_itype_unsigned_int},
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{0, NULL, 0, dbg_itype_none}
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};
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static const struct dbg_internal_var* be_i386_init_registers(CONTEXT* ctx)
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{
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struct dbg_internal_var* div;
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for (div = be_i386_ctx; div->name; div++)
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div->pval = (DWORD*)((char*)ctx + (DWORD)div->pval);
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return be_i386_ctx;
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}
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static unsigned be_i386_is_step_over_insn(const void* insn)
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{
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BYTE ch;
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for (;;)
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{
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if (!dbg_read_memory(insn, &ch, sizeof(ch))) return FALSE;
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switch (ch)
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{
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/* Skip all prefixes */
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case 0x2e: /* cs: */
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case 0x36: /* ss: */
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case 0x3e: /* ds: */
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case 0x26: /* es: */
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case 0x64: /* fs: */
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case 0x65: /* gs: */
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case 0x66: /* opcode size prefix */
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case 0x67: /* addr size prefix */
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case 0xf0: /* lock */
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case 0xf2: /* repne */
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case 0xf3: /* repe */
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insn = (const char*)insn + 1;
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continue;
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/* Handle call instructions */
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case 0xcd: /* int <intno> */
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case 0xe8: /* call <offset> */
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case 0x9a: /* lcall <seg>:<off> */
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return TRUE;
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case 0xff: /* call <regmodrm> */
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if (!dbg_read_memory((const char*)insn + 1, &ch, sizeof(ch)))
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return FALSE;
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return (((ch & 0x38) == 0x10) || ((ch & 0x38) == 0x18));
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/* Handle string instructions */
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case 0x6c: /* insb */
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case 0x6d: /* insw */
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case 0x6e: /* outsb */
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case 0x6f: /* outsw */
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case 0xa4: /* movsb */
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case 0xa5: /* movsw */
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case 0xa6: /* cmpsb */
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case 0xa7: /* cmpsw */
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case 0xaa: /* stosb */
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case 0xab: /* stosw */
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case 0xac: /* lodsb */
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case 0xad: /* lodsw */
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case 0xae: /* scasb */
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case 0xaf: /* scasw */
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return TRUE;
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default:
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return FALSE;
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}
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}
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}
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static unsigned be_i386_is_function_return(const void* insn)
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{
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BYTE ch;
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if (!dbg_read_memory(insn, &ch, sizeof(ch))) return FALSE;
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return (ch == 0xC2) || (ch == 0xC3);
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}
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static unsigned be_i386_is_break_insn(const void* insn)
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{
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BYTE c;
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if (!dbg_read_memory(insn, &c, 1)) return FALSE;
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return c == 0xCC;
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}
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static unsigned be_i386_is_func_call(const void* insn, ADDRESS* callee)
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{
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BYTE ch;
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int delta;
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dbg_read_memory(insn, &ch, sizeof(ch));
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if (ch == 0xe8)
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{
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dbg_read_memory((const char*)insn + 1, &delta, sizeof(delta));
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callee->Mode = AddrModeFlat;
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callee->Offset = (DWORD)insn;
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be_i386_disasm_one_insn(callee, FALSE);
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callee->Offset += delta;
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return TRUE;
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}
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return FALSE;
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}
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#define DR7_CONTROL_SHIFT 16
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#define DR7_CONTROL_SIZE 4
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#define DR7_RW_EXECUTE (0x0)
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#define DR7_RW_WRITE (0x1)
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#define DR7_RW_READ (0x3)
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#define DR7_LEN_1 (0x0)
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#define DR7_LEN_2 (0x4)
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#define DR7_LEN_4 (0xC)
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#define DR7_LOCAL_ENABLE_SHIFT 0
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#define DR7_GLOBAL_ENABLE_SHIFT 1
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#define DR7_ENABLE_SIZE 2
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#define DR7_LOCAL_ENABLE_MASK (0x55)
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#define DR7_GLOBAL_ENABLE_MASK (0xAA)
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#define DR7_CONTROL_RESERVED (0xFC00)
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#define DR7_LOCAL_SLOWDOWN (0x100)
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#define DR7_GLOBAL_SLOWDOWN (0x200)
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#define DR7_ENABLE_MASK(dr) (1<<(DR7_LOCAL_ENABLE_SHIFT+DR7_ENABLE_SIZE*(dr)))
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#define IS_DR7_SET(ctrl,dr) ((ctrl)&DR7_ENABLE_MASK(dr))
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static inline int be_i386_get_unused_DR(CONTEXT* ctx, unsigned long** r)
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{
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if (!IS_DR7_SET(ctx->Dr7, 0))
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{
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*r = &ctx->Dr0;
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return 0;
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}
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if (!IS_DR7_SET(ctx->Dr7, 1))
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{
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*r = &ctx->Dr1;
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return 1;
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}
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if (!IS_DR7_SET(ctx->Dr7, 2))
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{
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*r = &ctx->Dr2;
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return 2;
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}
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if (!IS_DR7_SET(ctx->Dr7, 3))
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{
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*r = &ctx->Dr3;
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return 3;
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}
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dbg_printf("All hardware registers have been used\n");
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return -1;
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}
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static unsigned be_i386_insert_Xpoint(HANDLE hProcess, CONTEXT* ctx,
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enum be_xpoint_type type, void* addr,
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unsigned long* val, unsigned size)
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{
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unsigned char ch;
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unsigned long sz;
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unsigned long* pr;
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int reg;
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unsigned long bits;
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switch (type)
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{
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case be_xpoint_break:
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if (size != 0) return 0;
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if (!ReadProcessMemory(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0;
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*val = ch;
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ch = 0xcc;
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if (!WriteProcessMemory(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0;
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break;
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case be_xpoint_watch_exec:
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bits = DR7_RW_EXECUTE;
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goto hw_bp;
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case be_xpoint_watch_read:
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bits = DR7_RW_READ;
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goto hw_bp;
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case be_xpoint_watch_write:
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bits = DR7_RW_WRITE;
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hw_bp:
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if ((reg = be_i386_get_unused_DR(ctx, &pr)) == -1) return 0;
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*pr = (unsigned long)addr;
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if (type != be_xpoint_watch_exec) switch (size)
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{
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case 4: bits |= DR7_LEN_4; break;
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case 2: bits |= DR7_LEN_2; break;
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case 1: bits |= DR7_LEN_1; break;
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default: return 0;
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}
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*val = reg;
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/* clear old values */
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ctx->Dr7 &= ~(0x0F << (DR7_CONTROL_SHIFT + DR7_CONTROL_SIZE * reg));
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/* set the correct ones */
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ctx->Dr7 |= bits << (DR7_CONTROL_SHIFT + DR7_CONTROL_SIZE * reg);
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ctx->Dr7 |= DR7_ENABLE_MASK(reg) | DR7_LOCAL_SLOWDOWN;
|
|
break;
|
|
default:
|
|
dbg_printf("Unknown bp type %c\n", type);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static unsigned be_i386_remove_Xpoint(HANDLE hProcess, CONTEXT* ctx,
|
|
enum be_xpoint_type type, void* addr,
|
|
unsigned long val, unsigned size)
|
|
{
|
|
unsigned long sz;
|
|
unsigned char ch;
|
|
|
|
switch (type)
|
|
{
|
|
case be_xpoint_break:
|
|
if (size != 0) return 0;
|
|
if (!ReadProcessMemory(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0;
|
|
if (ch != (unsigned char)0xCC)
|
|
WINE_FIXME("Cannot get back %02x instead of 0xCC at %08lx\n",
|
|
ch, (unsigned long)addr);
|
|
ch = (unsigned char)val;
|
|
if (!WriteProcessMemory(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0;
|
|
break;
|
|
case be_xpoint_watch_exec:
|
|
case be_xpoint_watch_read:
|
|
case be_xpoint_watch_write:
|
|
/* simply disable the entry */
|
|
ctx->Dr7 &= ~DR7_ENABLE_MASK(val);
|
|
break;
|
|
default:
|
|
dbg_printf("Unknown bp type %c\n", type);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static unsigned be_i386_is_watchpoint_set(const CONTEXT* ctx, unsigned idx)
|
|
{
|
|
return ctx->Dr6 & (1 << idx);
|
|
}
|
|
|
|
static void be_i386_clear_watchpoint(CONTEXT* ctx, unsigned idx)
|
|
{
|
|
ctx->Dr6 &= ~(1 << idx);
|
|
}
|
|
|
|
static int be_i386_adjust_pc_for_break(CONTEXT* ctx, BOOL way)
|
|
{
|
|
if (way)
|
|
{
|
|
ctx->Eip--;
|
|
return -1;
|
|
}
|
|
ctx->Eip++;
|
|
return 1;
|
|
}
|
|
|
|
static int be_i386_fetch_integer(const struct dbg_lvalue* lvalue, unsigned size,
|
|
unsigned ext_sign, long long int* ret)
|
|
{
|
|
if (size != 1 && size != 2 && size != 4 && size != 8) return FALSE;
|
|
|
|
memset(ret, 0, sizeof(*ret)); /* clear unread bytes */
|
|
/* FIXME: this assumes that debuggee and debugger use the same
|
|
* integral representation
|
|
*/
|
|
if (!memory_read_value(lvalue, size, ret)) return FALSE;
|
|
|
|
/* propagate sign information */
|
|
if (ext_sign && size < 8 && (*ret >> (size * 8 - 1)) != 0)
|
|
{
|
|
long long unsigned int neg = -1;
|
|
*ret |= neg << (size * 8);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static int be_i386_fetch_float(const struct dbg_lvalue* lvalue, unsigned size,
|
|
long double* ret)
|
|
{
|
|
char tmp[12];
|
|
|
|
/* FIXME: this assumes that debuggee and debugger use the same
|
|
* representation for reals
|
|
*/
|
|
if (!memory_read_value(lvalue, size, tmp)) return FALSE;
|
|
|
|
/* float & double types have to be promoted to a long double */
|
|
switch (size)
|
|
{
|
|
case sizeof(float): *ret = *(float*)tmp; break;
|
|
case sizeof(double): *ret = *(double*)tmp; break;
|
|
case sizeof(long double): *ret = *(long double*)tmp; break;
|
|
default: return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
struct backend_cpu be_i386 =
|
|
{
|
|
be_i386_linearize,
|
|
be_i386_build_addr,
|
|
be_i386_get_addr,
|
|
be_i386_single_step,
|
|
be_i386_print_context,
|
|
be_i386_print_segment_info,
|
|
be_i386_init_registers,
|
|
be_i386_is_step_over_insn,
|
|
be_i386_is_function_return,
|
|
be_i386_is_break_insn,
|
|
be_i386_is_func_call,
|
|
be_i386_disasm_one_insn,
|
|
be_i386_insert_Xpoint,
|
|
be_i386_remove_Xpoint,
|
|
be_i386_is_watchpoint_set,
|
|
be_i386_clear_watchpoint,
|
|
be_i386_adjust_pc_for_break,
|
|
be_i386_fetch_integer,
|
|
be_i386_fetch_float,
|
|
};
|
|
#endif
|