diff options
| author | Andi Kleen <ak@suse.de> | 2006-01-11 22:45:21 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:04:58 -0800 |
| commit | 7f6c5b046978d68e69bdc73433ead41612a2a1c9 (patch) | |
| tree | 60f74adc6166496fbd84143272ad3b88254f9b72 | |
| parent | 6e54d95f73bbc79171802a1983e0c3835676db88 (diff) | |
| download | linux-7f6c5b046978d68e69bdc73433ead41612a2a1c9.tar.gz | |
[PATCH] x86_64: Support alternative() in vsyscalls
The real vsyscall .text addresses are not mapped when the alternative()
replacement runs early, so use some black magic to access them using
the direct mapping.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/setup.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index e7a4d2cd39686..8090a0a468827 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -478,6 +478,8 @@ static unsigned char *k8_nops[ASM_NOP_MAX+1] = { k8nops + 1 + 2 + 3 + 4 + 5 + 6 + 7, }; +extern char __vsyscall_0; + /* Replace instructions with better alternatives for this CPU type. This runs before SMP is initialized to avoid SMP problems with @@ -489,11 +491,17 @@ void apply_alternatives(void *start, void *end) struct alt_instr *a; int diff, i, k; for (a = start; (void *)a < end; a++) { + u8 *instr; + if (!boot_cpu_has(a->cpuid)) continue; BUG_ON(a->replacementlen > a->instrlen); - __inline_memcpy(a->instr, a->replacement, a->replacementlen); + instr = a->instr; + /* vsyscall code is not mapped yet. resolve it manually. */ + if (instr >= (u8 *)VSYSCALL_START && instr < (u8*)VSYSCALL_END) + instr = __va(instr - (u8*)VSYSCALL_START + (u8*)__pa_symbol(&__vsyscall_0)); + __inline_memcpy(instr, a->replacement, a->replacementlen); diff = a->instrlen - a->replacementlen; /* Pad the rest with nops */ @@ -501,7 +509,7 @@ void apply_alternatives(void *start, void *end) k = diff; if (k > ASM_NOP_MAX) k = ASM_NOP_MAX; - __inline_memcpy(a->instr + i, k8_nops[k], k); + __inline_memcpy(instr + i, k8_nops[k], k); } } } |