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| author | Robin Getz <robin.getz@analog.com> | 2007-10-29 11:23:28 +0100 |
|---|---|---|
| committer | Bryan Wu <bryan.wu@analog.com> | 2007-10-29 11:23:28 +0100 |
| commit | 9f336a53266f43ae1002f4aaad5373944589c828 (patch) | |
| tree | 8de3512c947eb68d9b0bb2ed7de8cd6be37aecb1 /arch/blackfin/kernel/fixed_code.S | |
| parent | Blackfin arch: Add missing definitions of BF54x (diff) | |
| download | linux-9f336a53266f43ae1002f4aaad5373944589c828.tar.xz linux-9f336a53266f43ae1002f4aaad5373944589c828.zip | |
Blackfin arch: ensure that speculative loads of bad pointers don't cause us to do bad things.
Fix/change formatting of a few more things.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/kernel/fixed_code.S')
| -rw-r--r-- | arch/blackfin/kernel/fixed_code.S | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/fixed_code.S b/arch/blackfin/kernel/fixed_code.S index d8b1ebc70996..90262691b11a 100644 --- a/arch/blackfin/kernel/fixed_code.S +++ b/arch/blackfin/kernel/fixed_code.S @@ -129,4 +129,18 @@ ENTRY(_atomic_xor32) rts; ENDPROC (_atomic_ior32) +.align 16 + /* + * safe_user_instruction + * Four NOPS are enough to allow the pipeline to speculativily load + * execute anything it wants. After that, things have gone bad, and + * we are stuck - so panic. Since we might be in user space, we can't + * call panic, so just cause a unhandled exception, this should cause + * a dump of the trace buffer so we can tell were we are, and a reboot + */ +ENTRY(_safe_user_instruction) + NOP; NOP; NOP; NOP; + EXCPT 0x4; +ENDPROC(_safe_user_instruction) + ENTRY(_fixed_code_end) |