diff options
| author |   Aurelien Jarno <aurelien@aurel32.net> | 2012-01-07 15:20:12 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2012-01-10 18:30:08 +0100 |
| commit | 37769d27270eff15d878a1c7df23407fc5f09b7f (patch) | |
| tree | dfcc2640500c6d9022f614d98926fe812873f86b | |
| parent | 0b23c5d40ea933cfece3b4f69427f79c8a23256d (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>
(cherry picked from commit 0cdb95549fedc73e13c147ab9dcabcc303426a07)
| -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 bad357772..e04a6e0f5 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; |