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

Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Artyom Tarasenko 2016-06-24 14:34:30 +02:00 committed by Mark Cave-Ayland
parent a01aef5d2f
commit b64d2e57e7
1 changed files with 4 additions and 1 deletions
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5
target-sparc/translate.c
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@ -4679,12 +4679,15 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
case 0xd: /* ldstub -- XXX: should be atomically */ case 0xd: /* ldstub -- XXX: should be atomically */
{ {
TCGv r_const; TCGv r_const;
TCGv tmp = tcg_temp_new();
gen_address_mask(dc, cpu_addr); gen_address_mask(dc, cpu_addr);
tcg_gen_qemu_ld8u(cpu_val, cpu_addr, dc->mem_idx); tcg_gen_qemu_ld8u(tmp, cpu_addr, dc->mem_idx);
r_const = tcg_const_tl(0xff); r_const = tcg_const_tl(0xff);
tcg_gen_qemu_st8(r_const, cpu_addr, dc->mem_idx); tcg_gen_qemu_st8(r_const, cpu_addr, dc->mem_idx);
tcg_gen_mov_tl(cpu_val, tmp);
tcg_temp_free(r_const); tcg_temp_free(r_const);
tcg_temp_free(tmp);
} }
break; break;
case 0x0f: case 0x0f: