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target/i386: extract gen_far_call/jmp, reordering temporaries 

Extract the code into new functions, and swap T0/T1 so that T0 corresponds
to the first immediate in the instruction stream.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
master
Paolo Bonzini 2023-10-23 08:49:12 +02:00
parent cc1d28bdbe
commit 442e38c4fb
1 changed files with 53 additions and 40 deletions
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93
target/i386/tcg/translate.c
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@ -2512,12 +2512,13 @@ static inline void gen_op_movl_T0_seg(DisasContext *s, X86Seg seg_reg)
offsetof(CPUX86State,segs[seg_reg].selector));
}
static inline void gen_op_movl_seg_T0_vm(DisasContext *s, X86Seg seg_reg)
static void gen_op_movl_seg_real(DisasContext *s, X86Seg seg_reg, TCGv seg)
{
tcg_gen_ext16u_tl(s->T0, s->T0);
tcg_gen_st32_tl(s->T0, tcg_env,
TCGv selector = tcg_temp_new();
tcg_gen_ext16u_tl(selector, seg);
tcg_gen_st32_tl(selector, tcg_env,
offsetof(CPUX86State,segs[seg_reg].selector));
tcg_gen_shli_tl(cpu_seg_base[seg_reg], s->T0, 4);
tcg_gen_shli_tl(cpu_seg_base[seg_reg], selector, 4);
}
/* move T0 to seg_reg and compute if the CPU state may change. Never
@ -2537,13 +2538,45 @@ static void gen_movl_seg_T0(DisasContext *s, X86Seg seg_reg)
s->base.is_jmp = DISAS_EOB_NEXT;
}
} else {
gen_op_movl_seg_T0_vm(s, seg_reg);
gen_op_movl_seg_real(s, seg_reg, s->T0);
if (seg_reg == R_SS) {
s->base.is_jmp = DISAS_EOB_INHIBIT_IRQ;
}
}
}
static void gen_far_call(DisasContext *s)
{
TCGv_i32 new_cs = tcg_temp_new_i32();
tcg_gen_trunc_tl_i32(new_cs, s->T1);
if (PE(s) && !VM86(s)) {
gen_helper_lcall_protected(tcg_env, new_cs, s->T0,
tcg_constant_i32(s->dflag - 1),
eip_next_tl(s));
} else {
TCGv_i32 new_eip = tcg_temp_new_i32();
tcg_gen_trunc_tl_i32(new_eip, s->T0);
gen_helper_lcall_real(tcg_env, new_cs, new_eip,
tcg_constant_i32(s->dflag - 1),
eip_next_i32(s));
}
s->base.is_jmp = DISAS_JUMP;
}
static void gen_far_jmp(DisasContext *s)
{
if (PE(s) && !VM86(s)) {
TCGv_i32 new_cs = tcg_temp_new_i32();
tcg_gen_trunc_tl_i32(new_cs, s->T1);
gen_helper_ljmp_protected(tcg_env, new_cs, s->T0,
eip_next_tl(s));
} else {
gen_op_movl_seg_real(s, R_CS, s->T1);
gen_op_jmp_v(s, s->T0);
}
s->base.is_jmp = DISAS_JUMP;
}
static void gen_svm_check_intercept(DisasContext *s, uint32_t type)
{
/* no SVM activated; fast case */
@ -3654,23 +3687,10 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
if (mod == 3) {
goto illegal_op;
}
gen_op_ld_v(s, ot, s->T1, s->A0);
gen_op_ld_v(s, ot, s->T0, s->A0);
gen_add_A0_im(s, 1 << ot);
gen_op_ld_v(s, MO_16, s->T0, s->A0);
do_lcall:
if (PE(s) && !VM86(s)) {
tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
gen_helper_lcall_protected(tcg_env, s->tmp2_i32, s->T1,
tcg_constant_i32(dflag - 1),
eip_next_tl(s));
} else {
tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
tcg_gen_trunc_tl_i32(s->tmp3_i32, s->T1);
gen_helper_lcall_real(tcg_env, s->tmp2_i32, s->tmp3_i32,
tcg_constant_i32(dflag - 1),
eip_next_i32(s));
}
s->base.is_jmp = DISAS_JUMP;
gen_op_ld_v(s, MO_16, s->T1, s->A0);
gen_far_call(s);
break;
case 4: /* jmp Ev */
if (dflag == MO_16) {
@ -3684,19 +3704,10 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
if (mod == 3) {
goto illegal_op;
}
gen_op_ld_v(s, ot, s->T1, s->A0);
gen_op_ld_v(s, ot, s->T0, s->A0);
gen_add_A0_im(s, 1 << ot);
gen_op_ld_v(s, MO_16, s->T0, s->A0);
do_ljmp:
if (PE(s) && !VM86(s)) {
tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
gen_helper_ljmp_protected(tcg_env, s->tmp2_i32, s->T1,
eip_next_tl(s));
} else {
gen_op_movl_seg_T0_vm(s, R_CS);
gen_op_jmp_v(s, s->T1);
}
s->base.is_jmp = DISAS_JUMP;
gen_op_ld_v(s, MO_16, s->T1, s->A0);
gen_far_jmp(s);
break;
case 6: /* push Ev */
gen_push_v(s, s->T0);
@ -5136,7 +5147,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
/* pop selector */
gen_add_A0_im(s, 1 << dflag);
gen_op_ld_v(s, dflag, s->T0, s->A0);
gen_op_movl_seg_T0_vm(s, R_CS);
gen_op_movl_seg_real(s, R_CS, s->T0);
/* add stack offset */
gen_stack_update(s, val + (2 << dflag));
}
@ -5181,10 +5192,11 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
offset = insn_get(env, s, ot);
selector = insn_get(env, s, MO_16);
tcg_gen_movi_tl(s->T0, selector);
tcg_gen_movi_tl(s->T1, offset);
tcg_gen_movi_tl(s->T0, offset);
tcg_gen_movi_tl(s->T1, selector);
}
goto do_lcall;
gen_far_call(s);
break;
case 0xe9: /* jmp im */
{
int diff = (dflag != MO_16
@ -5205,10 +5217,11 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
offset = insn_get(env, s, ot);
selector = insn_get(env, s, MO_16);
tcg_gen_movi_tl(s->T0, selector);
tcg_gen_movi_tl(s->T1, offset);
tcg_gen_movi_tl(s->T0, offset);
tcg_gen_movi_tl(s->T1, selector);
}
goto do_ljmp;
gen_far_jmp(s);
break;
case 0xeb: /* jmp Jb */
{
int diff = (int8_t)insn_get(env, s, MO_8);