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[Qemu-devel] [PATCH v2] target-sh4: add atomic tas
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PATCH v2] target-sh4: add atomic tas |
Date: |
Thu, 3 Nov 2016 15:07:48 +0100 |
Implement real atomic tas:
When (Rn) = 0, 1 -> T
Otherwise, 0 -> T
In both cases, 1 -> MSB of (Rn)
using atomic_fetch_or_i32() and setcondi_i32().
Tested with image from:
http://wiki.qemu.org/download/sh-test-0.2.tar.bz2
This image contains a "tas_test" that runs without
error with this change.
Signed-off-by: Laurent Vivier <address@hidden>
---
v2:
- don't use helper but atomic_fetch_or_i32
Thank you Paolo!
target-sh4/translate.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/target-sh4/translate.c b/target-sh4/translate.c
index c89a147..1b83d59 100644
--- a/target-sh4/translate.c
+++ b/target-sh4/translate.c
@@ -1640,18 +1640,15 @@ 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_temp_new();
+ TCGv msb = tcg_const_i32(0x80);
+ tcg_gen_atomic_fetch_or_i32(val, REG(B11_8), msb,
+ ctx->memidx, MO_UB);
+ tcg_temp_free(msb);
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);
- }
+ tcg_temp_free(val);
+ }
return;
case 0xf00d: /* fsts FPUL,FRn - FPSCR: Nothing */
CHECK_FPU_ENABLED
--
2.7.4
- [Qemu-devel] [PATCH v2] target-sh4: add atomic tas,
Laurent Vivier <=
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Richard Henderson, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Paolo Bonzini, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Laurent Vivier, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Paolo Bonzini, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Laurent Vivier, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Richard Henderson, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Paolo Bonzini, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Richard Henderson, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, Laurent Vivier, 2016/11/03
- Re: [Qemu-devel] [PATCH v2] target-sh4: add atomic tas, John Paul Adrian Glaubitz, 2016/11/04