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STOS support (for memset)

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This commit is contained in:
Nekotekina 2015-02-17 05:01:47 +03:00
parent bddad4d766
commit 3f3873ceb5
1 changed files with 79 additions and 2 deletions
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81
Utilities/Thread.cpp
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@ -111,6 +111,7 @@ enum x64_op_t : u32
// example: add [rax],eax -> X64OP_LOAD_ADD_STORE (this will probably never happen for MMIO registers)
X64OP_MOVS,
X64OP_STOS,
X64OP_XCHG,
X64OP_CMPXCHG,
};
@ -397,6 +398,24 @@ void decode_x64_reg_op(const u8* code, x64_op_t& out_op, x64_reg_t& out_reg, siz
}
break;
}
case 0xaa:
{
if (!oso && !lock && !repe && !rex) // STOS
{
out_op = X64OP_STOS;
out_reg = X64_NOT_SET;
out_size = 1;
return;
}
if (!oso && !lock && repe) // REP STOS
{
out_op = X64OP_STOS;
out_reg = rex & 8 ? X64R_RCX : X64R_ECX;
out_size = 1;
return;
}
break;
}
case 0xc6:
{
if (!lock && !oso && get_modRM_reg(code, 0) == X64R_RAX) // MOV r8/m8, imm8
@ -661,7 +680,7 @@ bool set_x64_cmp_flags(x64_context* context, size_t d_size, u64 x, u64 y)
size_t get_x64_access_size(x64_context* context, x64_op_t op, x64_reg_t reg, size_t d_size, size_t i_size)
{
if (op == X64OP_MOVS && reg != X64_NOT_SET) // get "full" access size from RCX register
if ((op == X64OP_MOVS || op == X64OP_STOS) && reg != X64_NOT_SET) // get "full" access size from RCX register
{
u64 counter;
if (!get_x64_reg_value(context, reg, 8, i_size, counter))
@ -733,7 +752,8 @@ bool handle_access_violation(u32 addr, bool is_writing, x64_context* context)
break;
}
case X64OP_MOVS: // TODO
case X64OP_MOVS: // possibly, TODO
case X64OP_STOS:
default:
{
LOG_ERROR(MEMORY, "Invalid or unsupported operation (op=%d, reg=%d, d_size=%lld, i_size=%lld)", op, reg, d_size, i_size);
@ -860,6 +880,63 @@ bool handle_access_violation(u32 addr, bool is_writing, x64_context* context)
// don't skip partially processed instruction
return true;
}
case X64OP_STOS:
{
if (d_size > 8)
{
LOG_ERROR(MEMORY, "X64OP_STOS: d_size=%lld", d_size);
return false;
}
if (vm::get_ptr(addr) != (void*)RDI(context))
{
LOG_ERROR(MEMORY, "X64OP_STOS error: rdi=0x%llx, addr=0x%x", (u64)RDI(context), addr);
return false;
}
u64 value;
if (!get_x64_reg_value(context, X64R_RAX, d_size, i_size, value))
{
return false;
}
u32 a_addr = addr;
while (a_addr >> 12 == addr >> 12)
{
// fill data with value
memcpy(vm::get_priv_ptr(a_addr), &value, d_size);
// shift pointers
if (EFLAGS(context) & 0x400 /* direction flag */)
{
// for reversed direction, addr argument should be calculated in different way
LOG_ERROR(MEMORY, "X64OP_STOS TODO: reversed direction");
return false;
//RDI(context) -= d_size;
//a_addr -= (u32)d_size;
}
else
{
RDI(context) += d_size;
a_addr += (u32)d_size;
}
// decrement counter
if (reg == X64_NOT_SET || !--RCX(context))
{
break;
}
}
if (reg == X64_NOT_SET || !RCX(context))
{
break;
}
// don't skip partially processed instruction
return true;
}
case X64OP_XCHG:
{
if (d_size != 1 && d_size != 2 && d_size != 4 && d_size != 8)