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wine/programs/winedbg/be_i386.c
Eric Pouech deca2502d6 - all symbol information storage is now module relative, so we can 
unload a module (and it's debugging information), and a process
  without pain
- portabiblity to another CPU should be easier now (CPU dependent backend)
- speed up memory allocation
- stabs related fixes:
      + now correctly handling symbol's size
      + blocks {} in functions are now correctly recognized and stored
        (also applies to local variables scoping)
      + better basic types management (less wild guesses in the code)
      + full support of inline functions (source stepping now shows the
        code in .h files for example)
- removal of external debugger (attaching with gdb is just fine to
  debug winedbg)
- fixed a couple of issues for symbol address handling (address
  lookup, incorrect type binding)
- winedbg now has a man page
2004-06-04 00:59:16 +00:00

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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(ADDRESS* 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 ADDRESS* addr)
{
LDT_ENTRY le;
switch (addr->Mode)
{
case AddrModeReal:
return (void*)((DWORD)(LOWORD(addr->Segment) << 4) + addr->Offset);
case AddrMode1632:
if (!(addr->Segment & 4) || ((addr->Segment >> 3) < 17))
return (void*)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 + addr->Offset);
break;
case AddrModeFlat:
return (void*)addr->Offset;
}
return NULL;
}
static unsigned be_i386_build_addr(HANDLE hThread, const CONTEXT* ctx, ADDRESS* 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, ADDRESS* 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 void be_i386_single_step(CONTEXT* ctx, unsigned enable)
{
if (enable) ctx->EFlags |= STEP_FLAG;
else ctx->EFlags &= ~STEP_FLAG;
}
static void be_i386_print_context(HANDLE hThread, const CONTEXT* ctx)
{
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:%08lx ESP:%08lx EBP:%08lx EFLAGS:%08lx(%s)\n",
ctx->Eip, ctx->Esp, ctx->Ebp, ctx->EFlags, buf);
dbg_printf(" EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n",
ctx->Eax, ctx->Ebx, ctx->Ecx, ctx->Edx);
dbg_printf(" ESI:%08lx EDI:%08lx\n",
ctx->Esi, ctx->Edi);
break;
}
}
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 <intno> */
case 0xe8: /* call <offset> */
case 0x9a: /* lcall <seg>:<off> */
return TRUE;
case 0xff: /* call <regmodrm> */
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, 1)) return FALSE;
return c == 0xCC;
}
static unsigned be_i386_is_func_call(const void* insn, ADDRESS* callee)
{
BYTE ch;
int delta;
dbg_read_memory(insn, &ch, sizeof(ch));
if (ch == 0xe8)
{
dbg_read_memory((const char*)insn + 1, &delta, sizeof(delta));
callee->Mode = AddrModeFlat;
callee->Offset = (DWORD)insn;
be_i386_disasm_one_insn(callee, FALSE);
callee->Offset += delta;
return TRUE;
}
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, unsigned long** 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, CONTEXT* ctx,
enum be_xpoint_type type, void* addr,
unsigned long* val, unsigned size)
{
unsigned char ch;
unsigned long sz;
unsigned long* pr;
int reg;
unsigned long bits;
switch (type)
{
case be_xpoint_break:
if (size != 0) return 0;
if (!ReadProcessMemory(hProcess, addr, &ch, 1, &sz) || sz != 1) return 0;
*val = ch;
ch = 0xcc;
if (!WriteProcessMemory(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 = (unsigned long)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, 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
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