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target/i386: split gen_ldst_modrm for load and store

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The is_store argument of gen_ldst_modrm has only ever been passed
a constant.  Just split the function in two.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-04-24 15:04:13 +02:00
parent b3c49e654a
commit 420d60caad
1 changed files with 29 additions and 23 deletions
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52
target/i386/tcg/translate.c
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@ -1828,27 +1828,33 @@ static void gen_add_A0_ds_seg(DisasContext *s)
gen_lea_v_seg(s, s->aflag, s->A0, R_DS, s->override);
}
/* generate modrm memory load or store of 'reg'. */
static void gen_ldst_modrm(CPUX86State *env, DisasContext *s, int modrm,
MemOp ot, int is_store)
/* generate modrm load of memory or register. */
static void gen_ld_modrm(CPUX86State *env, DisasContext *s, int modrm, MemOp ot)
{
int mod, rm;
mod = (modrm >> 6) & 3;
rm = (modrm & 7) | REX_B(s);
if (mod == 3) {
if (is_store) {
gen_op_mov_reg_v(s, ot, rm, s->T0);
} else {
gen_op_mov_v_reg(s, ot, s->T0, rm);
}
gen_op_mov_v_reg(s, ot, s->T0, rm);
} else {
gen_lea_modrm(env, s, modrm);
if (is_store) {
gen_op_st_v(s, ot, s->T0, s->A0);
} else {
gen_op_ld_v(s, ot, s->T0, s->A0);
}
gen_op_ld_v(s, ot, s->T0, s->A0);
}
}
/* generate modrm store of memory or register. */
static void gen_st_modrm(CPUX86State *env, DisasContext *s, int modrm, MemOp ot)
{
int mod, rm;
mod = (modrm >> 6) & 3;
rm = (modrm & 7) | REX_B(s);
if (mod == 3) {
gen_op_mov_reg_v(s, ot, rm, s->T0);
} else {
gen_lea_modrm(env, s, modrm);
gen_op_st_v(s, ot, s->T0, s->A0);
}
}
@ -3438,7 +3444,7 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
ot = dflag;
modrm = x86_ldub_code(env, s);
reg = ((modrm >> 3) & 7) | REX_R(s);
gen_ldst_modrm(env, s, modrm, ot, 0);
gen_ld_modrm(env, s, modrm, ot);
gen_extu(ot, s->T0);
/* Note that lzcnt and tzcnt are in different extensions. */
@ -3589,14 +3595,14 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
tcg_gen_ld32u_tl(s->T0, tcg_env,
offsetof(CPUX86State, ldt.selector));
ot = mod == 3 ? dflag : MO_16;
gen_ldst_modrm(env, s, modrm, ot, 1);
gen_st_modrm(env, s, modrm, ot);
break;
case 2: /* lldt */
if (!PE(s) || VM86(s))
goto illegal_op;
if (check_cpl0(s)) {
gen_svm_check_intercept(s, SVM_EXIT_LDTR_WRITE);
gen_ldst_modrm(env, s, modrm, MO_16, 0);
gen_ld_modrm(env, s, modrm, MO_16);
tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
gen_helper_lldt(tcg_env, s->tmp2_i32);
}
@ -3611,14 +3617,14 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
tcg_gen_ld32u_tl(s->T0, tcg_env,
offsetof(CPUX86State, tr.selector));
ot = mod == 3 ? dflag : MO_16;
gen_ldst_modrm(env, s, modrm, ot, 1);
gen_st_modrm(env, s, modrm, ot);
break;
case 3: /* ltr */
if (!PE(s) || VM86(s))
goto illegal_op;
if (check_cpl0(s)) {
gen_svm_check_intercept(s, SVM_EXIT_TR_WRITE);
gen_ldst_modrm(env, s, modrm, MO_16, 0);
gen_ld_modrm(env, s, modrm, MO_16);
tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
gen_helper_ltr(tcg_env, s->tmp2_i32);
}
@ -3627,7 +3633,7 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
case 5: /* verw */
if (!PE(s) || VM86(s))
goto illegal_op;
gen_ldst_modrm(env, s, modrm, MO_16, 0);
gen_ld_modrm(env, s, modrm, MO_16);
gen_update_cc_op(s);
if (op == 4) {
gen_helper_verr(tcg_env, s->T0);
@ -3891,7 +3897,7 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
*/
mod = (modrm >> 6) & 3;
ot = (mod != 3 ? MO_16 : s->dflag);
gen_ldst_modrm(env, s, modrm, ot, 1);
gen_st_modrm(env, s, modrm, ot);
break;
case 0xee: /* rdpkru */
if (s->prefix & (PREFIX_LOCK | PREFIX_DATA
@ -3918,7 +3924,7 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
break;
}
gen_svm_check_intercept(s, SVM_EXIT_WRITE_CR0);
gen_ldst_modrm(env, s, modrm, MO_16, 0);
gen_ld_modrm(env, s, modrm, MO_16);
/*
* Only the 4 lower bits of CR0 are modified.
* PE cannot be set to zero if already set to one.
@ -3990,7 +3996,7 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
ot = dflag != MO_16 ? MO_32 : MO_16;
modrm = x86_ldub_code(env, s);
reg = ((modrm >> 3) & 7) | REX_R(s);
gen_ldst_modrm(env, s, modrm, MO_16, 0);
gen_ld_modrm(env, s, modrm, MO_16);
t0 = tcg_temp_new();
gen_update_cc_op(s);
if (b == 0x102) {
@ -4494,7 +4500,7 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
reg = ((modrm >> 3) & 7) | REX_R(s);
ot = dflag;
gen_ldst_modrm(env, s, modrm, ot, 0);
gen_ld_modrm(env, s, modrm, ot);
gen_extu(ot, s->T0);
tcg_gen_mov_tl(cpu_cc_src, s->T0);
tcg_gen_ctpop_tl(s->T0, s->T0);