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target/sh4: implement tas.b using atomic helper

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We only emulate UP SH4, however as the tas.b instruction is used in the GNU
libc, this improve linux-user emulation.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2017-05-01 23:20:43 +02:00
parent aa3513176f
commit cb32f179e0
1 changed files with 7 additions and 12 deletions
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19
target/sh4/translate.c
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@ -1634,19 +1634,14 @@ static void _decode_opc(DisasContext * ctx)
tcg_gen_shri_i32(REG(B11_8), REG(B11_8), 16);
return;
case 0x401b: /* tas.b @Rn */
{
TCGv addr, val;
addr = tcg_temp_local_new();
tcg_gen_mov_i32(addr, REG(B11_8));
val = tcg_temp_local_new();
tcg_gen_qemu_ld_i32(val, addr, ctx->memidx, MO_UB);
{
TCGv val = tcg_const_i32(0x80);
tcg_gen_atomic_fetch_or_i32(val, REG(B11_8), val,
ctx->memidx, MO_UB);
tcg_gen_setcondi_i32(TCG_COND_EQ, cpu_sr_t, val, 0);
tcg_gen_ori_i32(val, val, 0x80);
tcg_gen_qemu_st_i32(val, addr, ctx->memidx, MO_UB);
tcg_temp_free(val);
tcg_temp_free(addr);
}
return;
tcg_temp_free(val);
}
return;
case 0xf00d: /* fsts FPUL,FRn - FPSCR: Nothing */
CHECK_FPU_ENABLED
tcg_gen_mov_i32(cpu_fregs[FREG(B11_8)], cpu_fpul);