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target-i386: Rewrite leave

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Unify the code across stack pointer widths.  Fix the note about
not updating ESP before the potential exception.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1450379966-28198-9-git-send-email-rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard Henderson 2015-12-17 11:19:24 -08:00 committed by Paolo Bonzini
parent 743e398e2f
commit 2045f04c3a
1 changed files with 15 additions and 14 deletions
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29
target-i386/translate.c
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@ -2359,6 +2359,20 @@ static void gen_enter(DisasContext *s, int esp_addend, int level)
gen_op_mov_reg_v(a_ot, R_ESP, cpu_T[1]);
}
static void gen_leave(DisasContext *s)
{
TCGMemOp d_ot = mo_pushpop(s, s->dflag);
TCGMemOp a_ot = mo_stacksize(s);
gen_lea_v_seg(s, a_ot, cpu_regs[R_EBP], R_SS, -1);
gen_op_ld_v(s, d_ot, cpu_T[0], cpu_A0);
tcg_gen_addi_tl(cpu_T[1], cpu_regs[R_EBP], 1 << d_ot);
gen_op_mov_reg_v(d_ot, R_EBP, cpu_T[0]);
gen_op_mov_reg_v(a_ot, R_ESP, cpu_T[1]);
}
static void gen_exception(DisasContext *s, int trapno, target_ulong cur_eip)
{
gen_update_cc_op(s);
@ -5114,20 +5128,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
}
break;
case 0xc9: /* leave */
/* XXX: exception not precise (ESP is updated before potential exception) */
if (CODE64(s)) {
gen_op_mov_v_reg(MO_64, cpu_T[0], R_EBP);
gen_op_mov_reg_v(MO_64, R_ESP, cpu_T[0]);
} else if (s->ss32) {
gen_op_mov_v_reg(MO_32, cpu_T[0], R_EBP);
gen_op_mov_reg_v(MO_32, R_ESP, cpu_T[0]);
} else {
gen_op_mov_v_reg(MO_16, cpu_T[0], R_EBP);
gen_op_mov_reg_v(MO_16, R_ESP, cpu_T[0]);
}
ot = gen_pop_T0(s);
gen_op_mov_reg_v(ot, R_EBP, cpu_T[0]);
gen_pop_update(s, ot);
gen_leave(s);
break;
case 0x06: /* push es */
case 0x0e: /* push cs */