* [Qemu-devel] [SH4] Fix swap.b
@ 2008-10-12 15:21 Vladimir Prus
2008-10-12 23:31 ` Aurelien Jarno
0 siblings, 1 reply; 2+ messages in thread
From: Vladimir Prus @ 2008-10-12 15:21 UTC (permalink / raw)
To: qemu-devel
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The SH4 manual documents the swap.b instruction as follows:
SWAP.B Rm,Rn
Rm → swap lower 2 bytes → Rn
Current QEMU code, in addition to the above, also clears the high
16 bits. The immediate breakage I saw is that htonl function applied
to netmask of 255.255.255.0 gives 0, which breaks all networking.
Attached patch fixes the problem.
- Volodya
---
target-sh4/translate.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/target-sh4/translate.c b/target-sh4/translate.c
index 365936f..2ef8c00 100644
--- a/target-sh4/translate.c
+++ b/target-sh4/translate.c
@@ -686,7 +686,9 @@ void _decode_opc(DisasContext * ctx)
return;
case 0x6008: /* swap.b Rm,Rn */
{
- TCGv high, low;
+ TCGv highw, high, low;
+ highw = tcg_temp_new(TCG_TYPE_I32);
+ tcg_gen_andi_i32(highw, REG(B7_4), 0xffff0000);
high = tcg_temp_new(TCG_TYPE_I32);
tcg_gen_ext8u_i32(high, REG(B7_4));
tcg_gen_shli_i32(high, high, 8);
@@ -694,6 +696,7 @@ void _decode_opc(DisasContext * ctx)
tcg_gen_shri_i32(low, REG(B7_4), 8);
tcg_gen_ext8u_i32(low, low);
tcg_gen_or_i32(REG(B11_8), high, low);
+ tcg_gen_or_i32(REG(B11_8), REG(B11_8), highw);
tcg_temp_free(low);
tcg_temp_free(high);
}
--
1.5.3.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [SH4] Fix swap.b
2008-10-12 15:21 [Qemu-devel] [SH4] Fix swap.b Vladimir Prus
@ 2008-10-12 23:31 ` Aurelien Jarno
0 siblings, 0 replies; 2+ messages in thread
From: Aurelien Jarno @ 2008-10-12 23:31 UTC (permalink / raw)
To: qemu-devel
On Sun, Oct 12, 2008 at 07:21:05PM +0400, Vladimir Prus wrote:
>
> The SH4 manual documents the swap.b instruction as follows:
>
> SWAP.B Rm,Rn
> Rm → swap lower 2 bytes → Rn
>
> Current QEMU code, in addition to the above, also clears the high
> 16 bits. The immediate breakage I saw is that htonl function applied
> to netmask of 255.255.255.0 gives 0, which breaks all networking.
> Attached patch fixes the problem.
>
Thanks, applied.
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' aurel32@debian.org | aurelien@aurel32.net
`- people.debian.org/~aurel32 | www.aurel32.net
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