/* * Debugger i386 specific functions * * Copyright 2004 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 "debugger.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(winedbg); #ifdef __i386__ /* debugger/db_disasm.c */ extern void be_i386_disasm_one_insn(ADDRESS64* addr, int display); #define STEP_FLAG 0x00000100 /* single step flag */ #define V86_FLAG 0x00020000 #define IS_VM86_MODE(ctx) (ctx->EFlags & V86_FLAG) 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 (GetThreadSelectorEntry(hThread, sel, &le)) return le.HighWord.Bits.Default_Big ? AddrMode1632 : AddrMode1616; /* selector doesn't exist */ return -1; } static void* be_i386_linearize(HANDLE hThread, const ADDRESS64* addr) { LDT_ENTRY le; switch (addr->Mode) { case AddrModeReal: return (void*)((DWORD)(LOWORD(addr->Segment) << 4) + (DWORD)addr->Offset); case AddrMode1632: if (!(addr->Segment & 4) || ((addr->Segment >> 3) < 17)) return (void*)(DWORD)addr->Offset; /* fall through */ case AddrMode1616: if (!GetThreadSelectorEntry(hThread, addr->Segment, &le)) return NULL; return (void*)((le.HighWord.Bits.BaseHi << 24) + (le.HighWord.Bits.BaseMid << 16) + le.BaseLow + (DWORD)addr->Offset); break; case AddrModeFlat: return (void*)(DWORD)addr->Offset; } return NULL; } static unsigned be_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) { addr->Mode = get_selector_type(hThread, ctx, seg); switch (addr->Mode) { case AddrModeReal: case AddrMode1616: addr->Offset &= 0xffff; break; case AddrModeFlat: case AddrMode1632: break; default: addr->Mode = -1; return FALSE; } } return TRUE; } static unsigned be_i386_get_addr(HANDLE hThread, const CONTEXT* ctx, enum be_cpu_addr bca, ADDRESS64* addr) { switch (bca) { case be_cpu_addr_pc: return be_i386_build_addr(hThread, ctx, addr, ctx->SegCs, ctx->Eip); case be_cpu_addr_stack: return be_i386_build_addr(hThread, ctx, addr, ctx->SegSs, ctx->Esp); case be_cpu_addr_frame: return be_i386_build_addr(hThread, ctx, addr, ctx->SegSs, ctx->Ebp); } return FALSE; } static unsigned be_i386_get_register_info(int regno, enum be_cpu_addr* kind) { switch (regno) { case CV_REG_EIP: *kind = be_cpu_addr_pc; return TRUE; case CV_REG_EBP: *kind = be_cpu_addr_frame; return TRUE; case CV_REG_ESP: *kind = be_cpu_addr_stack; return TRUE; } return FALSE; } static void be_i386_single_step(CONTEXT* ctx, unsigned enable) { if (enable) ctx->EFlags |= STEP_FLAG; else ctx->EFlags &= ~STEP_FLAG; } static void be_i386_all_print_context(HANDLE hThread, const CONTEXT* ctx) { long double ST[8]; /* These are for floating regs */ int cnt; /* Break out the FPU state and the floating point registers */ dbg_printf("Floating Point Unit status:\n"); dbg_printf(" FLCW:%04x ", LOWORD(ctx->FloatSave.ControlWord)); dbg_printf(" FLTW:%04x ", LOWORD(ctx->FloatSave.TagWord)); dbg_printf(" FLEO:%08x ", (unsigned int) ctx->FloatSave.ErrorOffset); dbg_printf(" FLSW:%04x", LOWORD(ctx->FloatSave.StatusWord)); /* Isolate the condition code bits - note they are not contiguous */ dbg_printf("(CC:%d%d%d%d", (ctx->FloatSave.StatusWord & 0x00004000) >> 14, (ctx->FloatSave.StatusWord & 0x00000400) >> 10, (ctx->FloatSave.StatusWord & 0x00000200) >> 9, (ctx->FloatSave.StatusWord & 0x00000100) >> 8); /* Now pull out hte 3 bit of the TOP stack pointer */ dbg_printf(" TOP:%01x", (unsigned int) (ctx->FloatSave.StatusWord & 0x00003800) >> 11); /* Lets analyse the error bits and indicate the status * the Invalid Op flag has sub status which is tested as follows */ if (ctx->FloatSave.StatusWord & 0x00000001) { /* Invalid Fl OP */ if (ctx->FloatSave.StatusWord & 0x00000040) { /* Stack Fault */ if (ctx->FloatSave.StatusWord & 0x00000200) /* C1 says Overflow */ dbg_printf(" #IE(Stack Overflow)"); else dbg_printf(" #IE(Stack Underflow)"); /* Underflow */ } else dbg_printf(" #IE(Arthimetic error)"); /* Invalid Fl OP */ } if (ctx->FloatSave.StatusWord & 0x00000002) dbg_printf(" #DE"); /* Denormalised OP */ if (ctx->FloatSave.StatusWord & 0x00000004) dbg_printf(" #ZE"); /* Zero Divide */ if (ctx->FloatSave.StatusWord & 0x00000008) dbg_printf(" #OE"); /* Overflow */ if (ctx->FloatSave.StatusWord & 0x00000010) dbg_printf(" #UE"); /* Underflow */ if (ctx->FloatSave.StatusWord & 0x00000020) dbg_printf(" #PE"); /* Precision error */ if (ctx->FloatSave.StatusWord & 0x00000040) if (!(ctx->FloatSave.StatusWord & 0x00000001)) dbg_printf(" #SE"); /* Stack Fault (don't think this can occur) */ if (ctx->FloatSave.StatusWord & 0x00000080) dbg_printf(" #ES"); /* Error Summary */ if (ctx->FloatSave.StatusWord & 0x00008000) dbg_printf(" #FB"); /* FPU Busy */ dbg_printf(")\n"); /* Here are the rest of the registers */ dbg_printf(" FLES:%08x ", (unsigned int) ctx->FloatSave.ErrorSelector); dbg_printf(" FLDO:%08x ", (unsigned int) ctx->FloatSave.DataOffset); dbg_printf(" FLDS:%08x ", (unsigned int) ctx->FloatSave.DataSelector); dbg_printf(" FLCNS:%08x \n", (unsigned int) ctx->FloatSave.Cr0NpxState); /* Now for the floating point registers */ dbg_printf("Floating Point Registers:\n"); for (cnt = 0; cnt < 4; cnt++) { memcpy(&ST[cnt], &ctx->FloatSave.RegisterArea[cnt * 10], 10); dbg_printf(" ST%d:%Lf ", cnt, ST[cnt]); } dbg_printf("\n"); for (cnt = 4; cnt < 8; cnt++) { memcpy(&ST[cnt], &ctx->FloatSave.RegisterArea[cnt * 10], 10); dbg_printf(" ST%d:%Lf ", cnt, ST[cnt]); } dbg_printf("\n"); } static void be_i386_print_context(HANDLE hThread, const CONTEXT* ctx, int all_regs) { char buf[33]; char* pt; dbg_printf("Register dump:\n"); /* First get the segment registers out of the way */ dbg_printf(" CS:%04x SS:%04x DS:%04x ES:%04x FS:%04x GS:%04x", (WORD)ctx->SegCs, (WORD)ctx->SegSs, (WORD)ctx->SegDs, (WORD)ctx->SegEs, (WORD)ctx->SegFs, (WORD)ctx->SegGs); strcpy(buf, " - 00 - - - "); pt = buf + strlen(buf) - 1; if (ctx->EFlags & 0x00000001) *pt-- = 'C'; /* Carry Flag */ if (ctx->EFlags & 0x00000002) *pt-- = '1'; if (ctx->EFlags & 0x00000004) *pt-- = 'P'; /* Parity Flag */ if (ctx->EFlags & 0x00000008) *pt-- = '-'; if (ctx->EFlags & 0x00000010) *pt-- = 'A'; /* Auxiliary Carry Flag */ if (ctx->EFlags & 0x00000020) *pt-- = '-'; if (ctx->EFlags & 0x00000040) *pt-- = 'Z'; /* Zero Flag */ if (ctx->EFlags & 0x00000080) *pt-- = 'S'; /* Sign Flag */ if (ctx->EFlags & 0x00000100) *pt-- = 'T'; /* Trap/Trace Flag */ if (ctx->EFlags & 0x00000200) *pt-- = 'I'; /* Interupt Enable Flag */ if (ctx->EFlags & 0x00000400) *pt-- = 'D'; /* Direction Indicator */ if (ctx->EFlags & 0x00000800) *pt-- = 'O'; /* Overflow flags */ if (ctx->EFlags & 0x00001000) *pt-- = '1'; /* I/O Privilege Level */ if (ctx->EFlags & 0x00002000) *pt-- = '1'; /* I/O Privilege Level */ if (ctx->EFlags & 0x00004000) *pt-- = 'N'; /* Nested Task Flag */ if (ctx->EFlags & 0x00008000) *pt-- = '-'; if (ctx->EFlags & 0x00010000) *pt-- = 'R'; /* Resume Flag */ if (ctx->EFlags & 0x00020000) *pt-- = 'V'; /* Vritual Mode Flag */ if (ctx->EFlags & 0x00040000) *pt-- = 'a'; /* Alignment Check Flag */ switch (get_selector_type(hThread, ctx, ctx->SegCs)) { case AddrMode1616: case AddrModeReal: dbg_printf("\n IP:%04x SP:%04x BP:%04x FLAGS:%04x(%s)\n", LOWORD(ctx->Eip), LOWORD(ctx->Esp), LOWORD(ctx->Ebp), LOWORD(ctx->EFlags), buf); dbg_printf(" AX:%04x BX:%04x CX:%04x DX:%04x SI:%04x DI:%04x\n", LOWORD(ctx->Eax), LOWORD(ctx->Ebx), LOWORD(ctx->Ecx), LOWORD(ctx->Edx), LOWORD(ctx->Esi), LOWORD(ctx->Edi)); break; case AddrModeFlat: case AddrMode1632: dbg_printf("\n EIP:%08x ESP:%08x EBP:%08x EFLAGS:%08x(%s)\n", ctx->Eip, ctx->Esp, ctx->Ebp, ctx->EFlags, buf); dbg_printf(" EAX:%08x EBX:%08x ECX:%08x EDX:%08x\n", ctx->Eax, ctx->Ebx, ctx->Ecx, ctx->Edx); dbg_printf(" ESI:%08x EDI:%08x\n", ctx->Esi, ctx->Edi); break; } if (all_regs) be_i386_all_print_context(hThread, ctx); /* print floating regs */ } static void be_i386_print_segment_info(HANDLE hThread, const CONTEXT* ctx) { if (get_selector_type(hThread, ctx, ctx->SegCs) == AddrMode1616) { info_win32_segments(ctx->SegDs >> 3, 1); if (ctx->SegEs != ctx->SegDs) info_win32_segments(ctx->SegEs >> 3, 1); } info_win32_segments(ctx->SegFs >> 3, 1); } static struct dbg_internal_var be_i386_ctx[] = { {CV_REG_AL, "AL", (DWORD*)FIELD_OFFSET(CONTEXT, Eax), dbg_itype_unsigned_char_int}, {CV_REG_CL, "CL", (DWORD*)FIELD_OFFSET(CONTEXT, Ecx), dbg_itype_unsigned_char_int}, {CV_REG_DL, "DL", (DWORD*)FIELD_OFFSET(CONTEXT, Edx), dbg_itype_unsigned_char_int}, {CV_REG_BL, "BL", (DWORD*)FIELD_OFFSET(CONTEXT, Ebx), dbg_itype_unsigned_char_int}, {CV_REG_AH, "AH", (DWORD*)(FIELD_OFFSET(CONTEXT, Eax)+1), dbg_itype_unsigned_char_int}, {CV_REG_CH, "CH", (DWORD*)(FIELD_OFFSET(CONTEXT, Ecx)+1), dbg_itype_unsigned_char_int}, {CV_REG_DH, "DH", (DWORD*)(FIELD_OFFSET(CONTEXT, Edx)+1), dbg_itype_unsigned_char_int}, {CV_REG_BH, "BH", (DWORD*)(FIELD_OFFSET(CONTEXT, Ebx)+1), dbg_itype_unsigned_char_int}, {CV_REG_AX, "AX", (DWORD*)FIELD_OFFSET(CONTEXT, Eax), dbg_itype_unsigned_short_int}, {CV_REG_CX, "CX", (DWORD*)FIELD_OFFSET(CONTEXT, Ecx), dbg_itype_unsigned_short_int}, {CV_REG_DX, "DX", (DWORD*)FIELD_OFFSET(CONTEXT, Edx), dbg_itype_unsigned_short_int}, {CV_REG_BX, "BX", (DWORD*)FIELD_OFFSET(CONTEXT, Ebx), dbg_itype_unsigned_short_int}, {CV_REG_SP, "SP", (DWORD*)FIELD_OFFSET(CONTEXT, Esp), dbg_itype_unsigned_short_int}, {CV_REG_BP, "BP", (DWORD*)FIELD_OFFSET(CONTEXT, Ebp), dbg_itype_unsigned_short_int}, {CV_REG_SI, "SI", (DWORD*)FIELD_OFFSET(CONTEXT, Esi), dbg_itype_unsigned_short_int}, {CV_REG_DI, "DI", (DWORD*)FIELD_OFFSET(CONTEXT, Edi), dbg_itype_unsigned_short_int}, {CV_REG_EAX, "EAX", (DWORD*)FIELD_OFFSET(CONTEXT, Eax), dbg_itype_unsigned_int}, {CV_REG_ECX, "ECX", (DWORD*)FIELD_OFFSET(CONTEXT, Ecx), dbg_itype_unsigned_int}, {CV_REG_EDX, "EDX", (DWORD*)FIELD_OFFSET(CONTEXT, Edx), dbg_itype_unsigned_int}, {CV_REG_EBX, "EBX", (DWORD*)FIELD_OFFSET(CONTEXT, Ebx), dbg_itype_unsigned_int}, {CV_REG_ESP, "ESP", (DWORD*)FIELD_OFFSET(CONTEXT, Esp), dbg_itype_unsigned_int}, {CV_REG_EBP, "EBP", (DWORD*)FIELD_OFFSET(CONTEXT, Ebp), dbg_itype_unsigned_int}, {CV_REG_ESI, "ESI", (DWORD*)FIELD_OFFSET(CONTEXT, Esi), dbg_itype_unsigned_int}, {CV_REG_EDI, "EDI", (DWORD*)FIELD_OFFSET(CONTEXT, Edi), dbg_itype_unsigned_int}, {CV_REG_ES, "ES", (DWORD*)FIELD_OFFSET(CONTEXT, SegEs), dbg_itype_unsigned_short_int}, {CV_REG_CS, "CS", (DWORD*)FIELD_OFFSET(CONTEXT, SegCs), dbg_itype_unsigned_short_int}, {CV_REG_SS, "SS", (DWORD*)FIELD_OFFSET(CONTEXT, SegSs), dbg_itype_unsigned_short_int}, {CV_REG_DS, "DS", (DWORD*)FIELD_OFFSET(CONTEXT, SegDs), dbg_itype_unsigned_short_int}, {CV_REG_FS, "FS", (DWORD*)FIELD_OFFSET(CONTEXT, SegFs), dbg_itype_unsigned_short_int}, {CV_REG_GS, "GS", (DWORD*)FIELD_OFFSET(CONTEXT, SegGs), dbg_itype_unsigned_short_int}, {CV_REG_IP, "IP", (DWORD*)FIELD_OFFSET(CONTEXT, Eip), dbg_itype_unsigned_short_int}, {CV_REG_FLAGS, "FLAGS", (DWORD*)FIELD_OFFSET(CONTEXT, EFlags), dbg_itype_unsigned_short_int}, {CV_REG_EIP, "EIP", (DWORD*)FIELD_OFFSET(CONTEXT, Eip), dbg_itype_unsigned_int}, {CV_REG_EFLAGS, "EFLAGS", (DWORD*)FIELD_OFFSET(CONTEXT, EFlags), dbg_itype_unsigned_int}, {0, NULL, 0, dbg_itype_none} }; static const struct dbg_internal_var* be_i386_init_registers(CONTEXT* ctx) { struct dbg_internal_var* div; for (div = be_i386_ctx; div->name; div++) div->pval = (DWORD*)((char*)ctx + (DWORD)div->pval); return be_i386_ctx; } static unsigned be_i386_is_step_over_insn(const void* insn) { BYTE ch; for (;;) { if (!dbg_read_memory(insn, &ch, sizeof(ch))) return FALSE; switch (ch) { /* Skip all prefixes */ case 0x2e: /* cs: */ case 0x36: /* ss: */ case 0x3e: /* ds: */ case 0x26: /* es: */ case 0x64: /* fs: */ case 0x65: /* gs: */ case 0x66: /* opcode size prefix */ case 0x67: /* addr size prefix */ case 0xf0: /* lock */ case 0xf2: /* repne */ case 0xf3: /* repe */ insn = (const char*)insn + 1; continue; /* Handle call instructions */ case 0xcd: /* int */ case 0xe8: /* call */ case 0x9a: /* lcall : */ return TRUE; case 0xff: /* call */ if (!dbg_read_memory((const char*)insn + 1, &ch, sizeof(ch))) return FALSE; return (((ch & 0x38) == 0x10) || ((ch & 0x38) == 0x18)); /* Handle string instructions */ case 0x6c: /* insb */ case 0x6d: /* insw */ case 0x6e: /* outsb */ case 0x6f: /* outsw */ case 0xa4: /* movsb */ case 0xa5: /* movsw */ case 0xa6: /* cmpsb */ case 0xa7: /* cmpsw */ case 0xaa: /* stosb */ case 0xab: /* stosw */ case 0xac: /* lodsb */ case 0xad: /* lodsw */ case 0xae: /* scasb */ case 0xaf: /* scasw */ return TRUE; default: return FALSE; } } } static unsigned be_i386_is_function_return(const void* insn) { BYTE ch; if (!dbg_read_memory(insn, &ch, sizeof(ch))) return FALSE; return (ch == 0xC2) || (ch == 0xC3); } static unsigned be_i386_is_break_insn(const void* insn) { BYTE c; if (!dbg_read_memory(insn, &c, sizeof(c))) return FALSE; return c == 0xCC; } static unsigned get_size(ADDRESS_MODE am) { if (am == AddrModeReal || am == AddrMode1616) return 16; return 32; } static BOOL fetch_value(const char* addr, unsigned sz, int* value) { char value8; short value16; switch (sz) { case 8: if (!dbg_read_memory(addr, &value8, sizeof(value8))) return FALSE; *value = value8; break; case 16: if (!dbg_read_memory(addr, &value16, sizeof(value16))) return FALSE; *value = value16; case 32: if (!dbg_read_memory(addr, value, sizeof(*value))) return FALSE; break; default: return FALSE; } return TRUE; } static unsigned be_i386_is_func_call(const void* insn, ADDRESS64* callee) { BYTE ch; int delta; short segment; unsigned dst = 0; unsigned operand_size; ADDRESS_MODE cs_addr_mode; cs_addr_mode = get_selector_type(dbg_curr_thread->handle, &dbg_context, dbg_context.SegCs); operand_size = get_size(cs_addr_mode); /* get operand_size (also getting rid of the various prefixes */ do { if (!dbg_read_memory(insn, &ch, sizeof(ch))) return FALSE; if (ch == 0x66) { operand_size = 48 - operand_size; /* 16 => 32, 32 => 16 */ insn = (const char*)insn + 1; } } while (ch == 0x66 || ch == 0x67); switch (ch) { case 0xe8: /* relative near call */ callee->Mode = cs_addr_mode; if (!fetch_value((const char*)insn + 1, operand_size, &delta)) return FALSE; callee->Segment = dbg_context.SegCs; callee->Offset = (DWORD)insn + 1 + (operand_size / 8) + delta; return TRUE; case 0x9a: /* absolute far call */ if (!dbg_read_memory((const char*)insn + 1 + operand_size / 8, &segment, sizeof(segment))) return FALSE; callee->Mode = get_selector_type(dbg_curr_thread->handle, &dbg_context, segment); if (!fetch_value((const char*)insn + 1, operand_size, &delta)) return FALSE; callee->Segment = segment; callee->Offset = delta; return TRUE; case 0xff: if (!dbg_read_memory((const char*)insn + 1, &ch, sizeof(ch))) return FALSE; /* keep only the CALL and LCALL insn:s */ switch ((ch >> 3) & 0x07) { case 0x02: segment = dbg_context.SegCs; break; case 0x03: if (!dbg_read_memory((const char*)insn + 1 + operand_size / 8, &segment, sizeof(segment))) return FALSE; break; default: return FALSE; } /* FIXME: we only support the 32 bit far calls for now */ if (operand_size != 32) { WINE_FIXME("Unsupported yet call insn (0xFF 0x%02x) with 16 bit operand-size at %p\n", ch, insn); return FALSE; } switch (ch & 0xC7) /* keep Mod R/M only (skip reg) */ { case 0x04: case 0x44: case 0x84: WINE_FIXME("Unsupported yet call insn (0xFF 0x%02x) (SIB bytes) at %p\n", ch, insn); return FALSE; case 0x05: /* addr32 */ if ((ch & 0x38) == 0x10 || /* call */ (ch & 0x38) == 0x18) /* lcall */ { void *addr; if (!dbg_read_memory((const char *)insn + 2, &addr, sizeof(addr))) return FALSE; if ((ch & 0x38) == 0x18) /* lcall */ { if (!dbg_read_memory((const char*)addr + operand_size, &segment, sizeof(segment))) return FALSE; } else segment = dbg_context.SegCs; if (!dbg_read_memory((const char*)addr, &dst, sizeof(dst))) return FALSE; callee->Mode = get_selector_type(dbg_curr_thread->handle, &dbg_context, segment); callee->Segment = segment; callee->Offset = dst; return TRUE; } return FALSE; default: switch (ch & 0x07) { case 0x00: dst = dbg_context.Eax; break; case 0x01: dst = dbg_context.Ecx; break; case 0x02: dst = dbg_context.Edx; break; case 0x03: dst = dbg_context.Ebx; break; case 0x04: dst = dbg_context.Esp; break; case 0x05: dst = dbg_context.Ebp; break; case 0x06: dst = dbg_context.Esi; break; case 0x07: dst = dbg_context.Edi; break; } if ((ch >> 6) != 0x03) /* indirect address */ { if (ch >> 6) /* we got a displacement */ { if (!fetch_value((const char*)insn + 2, (ch >> 6) == 0x01 ? 8 : 32, &delta)) return FALSE; dst += delta; } if (((ch >> 3) & 0x07) == 0x03) /* LCALL */ { if (!dbg_read_memory((const char*)dst + operand_size, &segment, sizeof(segment))) return FALSE; } else segment = dbg_context.SegCs; if (!dbg_read_memory((const char*)dst, &delta, sizeof(delta))) return FALSE; callee->Mode = get_selector_type(dbg_curr_thread->handle, &dbg_context, segment); callee->Segment = segment; callee->Offset = delta; } else { callee->Mode = cs_addr_mode; callee->Segment = dbg_context.SegCs; callee->Offset = dst; } } return TRUE; case 0xCD: WINE_FIXME("Unsupported yet call insn (0x%02x) at %p\n", ch, insn); /* fall through */ default: return FALSE; } } #define DR7_CONTROL_SHIFT 16 #define DR7_CONTROL_SIZE 4 #define DR7_RW_EXECUTE (0x0) #define DR7_RW_WRITE (0x1) #define DR7_RW_READ (0x3) #define DR7_LEN_1 (0x0) #define DR7_LEN_2 (0x4) #define DR7_LEN_4 (0xC) #define DR7_LOCAL_ENABLE_SHIFT 0 #define DR7_GLOBAL_ENABLE_SHIFT 1 #define DR7_ENABLE_SIZE 2 #define DR7_LOCAL_ENABLE_MASK (0x55) #define DR7_GLOBAL_ENABLE_MASK (0xAA) #define DR7_CONTROL_RESERVED (0xFC00) #define DR7_LOCAL_SLOWDOWN (0x100) #define DR7_GLOBAL_SLOWDOWN (0x200) #define DR7_ENABLE_MASK(dr) (1<<(DR7_LOCAL_ENABLE_SHIFT+DR7_ENABLE_SIZE*(dr))) #define IS_DR7_SET(ctrl,dr) ((ctrl)&DR7_ENABLE_MASK(dr)) static inline int be_i386_get_unused_DR(CONTEXT* ctx, DWORD** r) { if (!IS_DR7_SET(ctx->Dr7, 0)) { *r = &ctx->Dr0; return 0; } if (!IS_DR7_SET(ctx->Dr7, 1)) { *r = &ctx->Dr1; return 1; } if (!IS_DR7_SET(ctx->Dr7, 2)) { *r = &ctx->Dr2; return 2; } if (!IS_DR7_SET(ctx->Dr7, 3)) { *r = &ctx->Dr3; return 3; } dbg_printf("All hardware registers have been used\n"); return -1; } static unsigned be_i386_insert_Xpoint(HANDLE hProcess, const struct be_process_io* pio, CONTEXT* ctx, enum be_xpoint_type type, void* addr, unsigned long* val, unsigned size) { unsigned char ch; SIZE_T sz; DWORD *pr; int reg; unsigned long bits; switch (type) { case be_xpoint_break: if (size != 0) return 0; if (!pio->read(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0; *val = ch; ch = 0xcc; if (!pio->write(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0; break; case be_xpoint_watch_exec: bits = DR7_RW_EXECUTE; goto hw_bp; case be_xpoint_watch_read: bits = DR7_RW_READ; goto hw_bp; case be_xpoint_watch_write: bits = DR7_RW_WRITE; hw_bp: if ((reg = be_i386_get_unused_DR(ctx, &pr)) == -1) return 0; *pr = (DWORD)addr; if (type != be_xpoint_watch_exec) switch (size) { case 4: bits |= DR7_LEN_4; break; case 2: bits |= DR7_LEN_2; break; case 1: bits |= DR7_LEN_1; break; default: return 0; } *val = reg; /* clear old values */ ctx->Dr7 &= ~(0x0F << (DR7_CONTROL_SHIFT + DR7_CONTROL_SIZE * reg)); /* set the correct ones */ ctx->Dr7 |= bits << (DR7_CONTROL_SHIFT + DR7_CONTROL_SIZE * reg); 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, const struct be_process_io* pio, CONTEXT* ctx, enum be_xpoint_type type, void* addr, unsigned long val, unsigned size) { SIZE_T sz; unsigned char ch; switch (type) { case be_xpoint_break: if (size != 0) return 0; if (!pio->read(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 (!pio->write(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, LONGLONG* 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) { ULONGLONG 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_get_register_info, 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