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instrs: Properly handle PUSH/POP of SEG registers

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This commit is contained in:
Alexis Engelke
2021-01-03 17:48:40 +01:00
parent 3a3a284f6f
commit d2bf961b77
5 changed files with 44 additions and 28 deletions
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14
decode.c
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@@ -428,11 +428,17 @@ prefix_end:
{
// If there is no ModRM, but a Mod-Reg, its opcode-encoded.
FdOp* operand = &instr->operands[DESC_MODREG_IDX(desc)];
uint8_t reg_idx = buffer[off - 1] & 7;
// Only used for GP registers, therefore always apply REX.B.
reg_idx += prefix_rex & PREFIX_REXB ? 8 : 0;
operand->type = FD_OT_REG;
operand->reg = reg_idx;
if (LIKELY(!DESC_VSIB(desc)))
{
// Only used for GP registers, therefore always apply REX.B.
operand->reg = (buffer[off - 1] & 7) + (prefix_rex & PREFIX_REXB ? 8 : 0);
}
else
{
operand->misc = FD_RT_SEG;
operand->reg = (buffer[off - 1] >> 3) & 7;
}
}
if (UNLIKELY(DESC_HAS_VEXREG(desc)))