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target/arm: Decode PAuth within disas_uncond_b_reg

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Backports commit 561c0a33080f1058a7671d0223122c98e4c9c1f0 from qemu
This commit is contained in:
Richard Henderson 2019-01-22 15:54:27 -05:00 committed by Lioncash
parent 0c09366d68
commit 8356fc365f
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 81 additions and 1 deletions
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82
qemu/target/arm/translate-a64.c
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@ -2063,6 +2063,7 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
TCGContext *tcg_ctx = s->uc->tcg_ctx;
unsigned int opc, op2, op3, rn, op4;
TCGv_i64 dst;
TCGv_i64 modifier;
opc = extract32(insn, 21, 4);
op2 = extract32(insn, 16, 5);
@ -2080,12 +2081,44 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
case 2: /* RET */
switch (op3) {
case 0:
/* BR, BLR, RET */
if (op4 != 0) {
goto do_unallocated;
}
dst = cpu_reg(s, rn);
break;
case 2:
case 3:
if (!dc_isar_feature(aa64_pauth, s)) {
goto do_unallocated;
}
if (opc == 2) {
/* RETAA, RETAB */
if (rn != 0x1f || op4 != 0x1f) {
goto do_unallocated;
}
rn = 30;
modifier = tcg_ctx->cpu_X[31];
} else {
/* BRAAZ, BRABZ, BLRAAZ, BLRABZ */
if (op4 != 0x1f) {
goto do_unallocated;
}
modifier = new_tmp_a64_zero(s);
}
if (s->pauth_active) {
dst = new_tmp_a64(s);
if (op3 == 2) {
gen_helper_autia(tcg_ctx, dst, tcg_ctx->cpu_env, cpu_reg(s, rn), modifier);
} else {
gen_helper_autib(tcg_ctx, dst, tcg_ctx->cpu_env, cpu_reg(s, rn), modifier);
}
} else {
dst = cpu_reg(s, rn);
}
break;
default:
goto do_unallocated;
}
@ -2097,12 +2130,38 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
}
break;
case 8: /* BRAA */
case 9: /* BLRAA */
if (!dc_isar_feature(aa64_pauth, s)) {
goto do_unallocated;
}
if (op3 != 2 || op3 != 3) {
goto do_unallocated;
}
if (s->pauth_active) {
dst = new_tmp_a64(s);
modifier = cpu_reg_sp(s, op4);
if (op3 == 2) {
gen_helper_autia(tcg_ctx, dst, tcg_ctx->cpu_env, cpu_reg(s, rn), modifier);
} else {
gen_helper_autib(tcg_ctx, dst, tcg_ctx->cpu_env, cpu_reg(s, rn), modifier);
}
} else {
dst = cpu_reg(s, rn);
}
gen_a64_set_pc(s, dst);
/* BLRAA also needs to load return address */
if (opc == 9) {
tcg_gen_movi_i64(tcg_ctx, cpu_reg(s, 30), s->pc);
}
break;
case 4: /* ERET */
if (s->current_el == 0) {
goto do_unallocated;
}
switch (op3) {
case 0:
case 0: /* ERET */
if (op4 != 0) {
goto do_unallocated;
}
@ -2111,6 +2170,27 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
offsetof(CPUARMState, elr_el[s->current_el]));
break;
case 2: /* ERETAA */
case 3: /* ERETAB */
if (!dc_isar_feature(aa64_pauth, s)) {
goto do_unallocated;
}
if (rn != 0x1f || op4 != 0x1f) {
goto do_unallocated;
}
dst = tcg_temp_new_i64(tcg_ctx);
tcg_gen_ld_i64(tcg_ctx, dst, tcg_ctx->cpu_env,
offsetof(CPUARMState, elr_el[s->current_el]));
if (s->pauth_active) {
modifier = tcg_ctx->cpu_X[31];
if (op3 == 2) {
gen_helper_autia(tcg_ctx, dst, tcg_ctx->cpu_env, dst, modifier);
} else {
gen_helper_autib(tcg_ctx, dst, tcg_ctx->cpu_env, dst, modifier);
}
}
break;
default:
goto do_unallocated;
}