diff options
| author | Aurelien Jarno <aurelien@aurel32.net> | 2012-01-07 15:20:12 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2012-01-10 18:20:10 +0100 |
| commit | 0cdb95549fedc73e13c147ab9dcabcc303426a07 (patch) | |
| tree | e57262970370ab760dc72b6022810bdc0d0c8a9c | |
| parent | 05b922dd0a1919c265361ca62902d6cdaea4cc36 (diff) | |
target-sh4: ignore ocbp and ocbwb instructions
ocbp and ocbwb controls the writeback of a cache line to memory. They
are supposed to do nothing in case of a cache miss. Given QEMU only
partially emulate caches, it is safe to ignore these instructions.
This fixes a kernel oops when trying to access an rtl8139 NIC with
recent versions.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
| -rw-r--r-- | target-sh4/translate.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/target-sh4/translate.c b/target-sh4/translate.c index 2ecb23671f..aacf96d9a3 100644 --- a/target-sh4/translate.c +++ b/target-sh4/translate.c @@ -1652,18 +1652,10 @@ static void _decode_opc(DisasContext * ctx) } return; case 0x00a3: /* ocbp @Rn */ - { - TCGv dummy = tcg_temp_new(); - tcg_gen_qemu_ld32s(dummy, REG(B11_8), ctx->memidx); - tcg_temp_free(dummy); - } - return; case 0x00b3: /* ocbwb @Rn */ - { - TCGv dummy = tcg_temp_new(); - tcg_gen_qemu_ld32s(dummy, REG(B11_8), ctx->memidx); - tcg_temp_free(dummy); - } + /* These instructions are supposed to do nothing in case of + a cache miss. Given that we only partially emulate caches + it is safe to simply ignore them. */ return; case 0x0083: /* pref @Rn */ return; |