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target-sparc: fix register corruption in ldstub if there is no write permission

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Backports commit 9566ceeef41ccb5241d340b34776a33450e8f9e5 from qemu
This commit is contained in:
Artyom Tarasenko 2018-02-23 14:06:30 -05:00 committed by Lioncash
parent 44c4dd02c9
commit 1781d5cfa6
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 1 deletions
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5
qemu/target-sparc/translate.c
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@ -4805,12 +4805,15 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn, bool hook_ins
case 0xd: /* ldstub -- XXX: should be atomically */
{
TCGv r_const;
TCGv tmp = tcg_temp_new(tcg_ctx);
gen_address_mask(dc, cpu_addr);
tcg_gen_qemu_ld8u(dc->uc, cpu_val, cpu_addr, dc->mem_idx);
tcg_gen_qemu_ld8u(dc->uc, tmp, cpu_addr, dc->mem_idx);
r_const = tcg_const_tl(tcg_ctx, 0xff);
tcg_gen_qemu_st8(dc->uc, r_const, cpu_addr, dc->mem_idx);
tcg_gen_mov_tl(tcg_ctx, cpu_val, tmp);
tcg_temp_free(tcg_ctx, r_const);
tcg_temp_free(tcg_ctx, tmp);
}
break;
case 0x0f: