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winedbg: Add support for x86_64 indirect function call targets.

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Signed-off-by: Conor McCarthy <cmccarthy@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Conor McCarthy 2019-11-23 01:15:56 +10:00 committed by Alexandre Julliard
parent f9e1a82764
commit 26df43d8ca
1 changed files with 89 additions and 6 deletions
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95
programs/winedbg/be_x86_64.c
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@ -269,6 +269,9 @@ static struct dbg_internal_var be_x86_64_ctx[] =
#define f_mod(b) ((b)>>6)
#define f_reg(b) (((b)>>3)&0x7)
#define f_rm(b) ((b)&0x7)
#define f_sib_b(b) ((b)&0x7)
#define f_sib_i(b) (((b)>>3)&0x7)
#define f_sib_s(b) ((b)>>6)
static BOOL be_x86_64_is_step_over_insn(const void* insn)
{
@ -371,6 +374,81 @@ static BOOL fetch_value(const char* addr, unsigned sz, int* value)
return TRUE;
}
static BOOL add_fixed_displacement(const void* insn, BYTE mod, DWORD64* addr)
{
LONG delta = 0;
if (mod == 1)
{
if (!fetch_value(insn, 1, &delta))
return FALSE;
}
else if (mod == 2)
{
if (!fetch_value(insn, sizeof(delta), &delta))
return FALSE;
}
*addr += delta;
return TRUE;
}
static BOOL evaluate_sib_address(const void* insn, BYTE mod, DWORD64* addr)
{
BYTE ch;
BYTE scale;
DWORD64 loc;
if (!dbg_read_memory(insn, &ch, sizeof(ch))) return FALSE;
switch (f_sib_b(ch))
{
case 0x00: loc = dbg_context.ctx.Rax; break;
case 0x01: loc = dbg_context.ctx.Rcx; break;
case 0x02: loc = dbg_context.ctx.Rdx; break;
case 0x03: loc = dbg_context.ctx.Rbx; break;
case 0x04: loc = dbg_context.ctx.Rsp; break;
case 0x05:
loc = dbg_context.ctx.Rbp;
if (mod == 0)
{
loc = 0;
mod = 2;
}
break;
case 0x06: loc = dbg_context.ctx.Rsi; break;
case 0x07: loc = dbg_context.ctx.Rdi; break;
}
scale = f_sib_s(ch);
switch (f_sib_i(ch))
{
case 0x00: loc += dbg_context.ctx.Rax << scale; break;
case 0x01: loc += dbg_context.ctx.Rcx << scale; break;
case 0x02: loc += dbg_context.ctx.Rdx << scale; break;
case 0x03: loc += dbg_context.ctx.Rbx << scale; break;
case 0x04: break;
case 0x05: loc += dbg_context.ctx.Rbp << scale; break;
case 0x06: loc += dbg_context.ctx.Rsi << scale; break;
case 0x07: loc += dbg_context.ctx.Rdi << scale; break;
}
if (!add_fixed_displacement((const char*)insn + 1, mod, &loc))
return FALSE;
*addr = loc;
return TRUE;
}
static BOOL load_indirect_target(DWORD64* dst)
{
ADDRESS64 addr;
addr.Mode = AddrModeFlat;
addr.Segment = dbg_context.ctx.SegDs;
addr.Offset = *dst;
return dbg_read_memory(memory_to_linear_addr(&addr), &dst, sizeof(dst));
}
static BOOL be_x86_64_is_func_call(const void* insn, ADDRESS64* callee)
{
BYTE ch;
@ -418,8 +496,12 @@ static BOOL be_x86_64_is_func_call(const void* insn, ADDRESS64* callee)
case 0x04:
case 0x44:
case 0x84:
WINE_FIXME("Unsupported yet call insn (0xFF 0x%02x) (SIB bytes) at %p\n", ch, insn);
return FALSE;
{
evaluate_sib_address((const char*)insn + 2, f_mod(ch), &dst);
if (!load_indirect_target(&dst)) return FALSE;
callee->Offset = dst;
return TRUE;
}
case 0x05: /* addr32 */
if (f_reg(ch) == 0x2)
{
@ -446,12 +528,13 @@ static BOOL be_x86_64_is_func_call(const void* insn, ADDRESS64* callee)
case 0x07: dst = dbg_context.ctx.Rdi; break;
}
if (f_mod(ch) != 0x03)
WINE_FIXME("Unsupported yet call insn (0xFF 0x%02x) at %p\n", ch, insn);
else
{
callee->Offset = dst;
if (!add_fixed_displacement((const char*)insn + 2, f_mod(ch), &dst))
return FALSE;
if (!load_indirect_target(&dst)) return FALSE;
}
break;
callee->Offset = dst;
return TRUE;
}
else
WINE_FIXME("Unsupported yet call insn (rex=0x%02x 0xFF 0x%02x) at %p\n", rex, ch, insn);