diff options
| author |   Robin Getz <robin.getz@analog.com> | 2007-10-29 18:23:28 +0800 |
|---|---|---|
| committer |   Bryan Wu <bryan.wu@analog.com> | 2007-10-29 18:23:28 +0800 |
| commit | 9f336a53266f43ae1002f4aaad5373944589c828 (patch) | |
| tree | 8de3512c947eb68d9b0bb2ed7de8cd6be37aecb1 /arch/blackfin/kernel | |
| parent | Blackfin arch: Add missing definitions of BF54x (diff) | |
| download | linux-dev-9f336a53266f43ae1002f4aaad5373944589c828.tar.xz linux-dev-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 '')
| -rw-r--r-- | arch/blackfin/kernel/fixed_code.S | 14 | ||||
| -rw-r--r-- | arch/blackfin/kernel/setup.c | 2 |
2 files changed, 16 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) diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c index fc22ec8c2f47..934234f43839 100644 --- a/arch/blackfin/kernel/setup.c +++ b/arch/blackfin/kernel/setup.c @@ -431,6 +431,8 @@ void __init setup_arch(char **cmdline_p) != ATOMIC_AND32 - FIXED_CODE_START); BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start != ATOMIC_XOR32 - FIXED_CODE_START); + BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start + != SAFE_USER_INSTRUCTION - FIXED_CODE_START); init_exception_vectors(); bf53x_cache_init(); |