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authorbibo, mao <bibo.mao@intel.com>2006-07-30 06:03:26 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-31 16:28:38 -0400
commita9ad965ea9a6d719daf333847a2ceb0e363994bd (patch)
tree9ecb71f533c16eb790909f13fefd67fd939ffb2b /arch/ia64
parent25c8716cb08dea386c7d6220b82eba732ccbf976 (diff)
[PATCH] IA64: kprobe invalidate icache of jump buffer
Kprobe inserts breakpoint instruction in probepoint and then jumps to instruction slot when breakpoint is hit, the instruction slot icache must be consistent with dcache. Here is the patch which invalidates instruction slot icache area. Without this patch, in some machines there will be fault when executing instruction slot where icache content is inconsistent with dcache. Signed-off-by: bibo,mao <bibo.mao@intel.com> Acked-by: "Luck, Tony" <tony.luck@intel.com> Acked-by: Keshavamurthy Anil S <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/kprobes.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 00d9c83b8020..781960f80b6f 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -448,11 +448,20 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
448 return 0; 448 return 0;
449} 449}
450 450
451void __kprobes flush_insn_slot(struct kprobe *p)
452{
453 unsigned long arm_addr;
454
455 arm_addr = ((unsigned long)&p->opcode.bundle) & ~0xFULL;
456 flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t));
457}
458
451void __kprobes arch_arm_kprobe(struct kprobe *p) 459void __kprobes arch_arm_kprobe(struct kprobe *p)
452{ 460{
453 unsigned long addr = (unsigned long)p->addr; 461 unsigned long addr = (unsigned long)p->addr;
454 unsigned long arm_addr = addr & ~0xFULL; 462 unsigned long arm_addr = addr & ~0xFULL;
455 463
464 flush_insn_slot(p);
456 memcpy((char *)arm_addr, &p->ainsn.insn.bundle, sizeof(bundle_t)); 465 memcpy((char *)arm_addr, &p->ainsn.insn.bundle, sizeof(bundle_t));
457 flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t)); 466 flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t));
458} 467}