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ARM kprobes: special hook for the kprobes breakpoint handler

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The kprobes code is already able to cope with reentrant probes, so its
handler must be called outside of the region protected by undef_lock.

If ever this lock is released when handlers are called then this commit
could be reverted.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
This commit is contained in:
Nicolas Pitre
2007-12-03 17:22:36 -05:00
committed by Russell King
parent 785d3cd286
commit 796969104c
3 changed files with 20 additions and 7 deletions
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8
arch/arm/kernel/kprobes.c
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@ -26,12 +26,6 @@
#include <asm/traps.h>
#include <asm/cacheflush.h>
/*
* This undefined instruction must be unique and
* reserved solely for kprobes' use.
*/
#define KPROBE_BREAKPOINT_INSTRUCTION 0xe7f001f8
#define MIN_STACK_SIZE(addr) \
min((unsigned long)MAX_STACK_SIZE, \
(unsigned long)current_thread_info() + THREAD_START_SP - (addr))
@ -206,7 +200,7 @@ void __kprobes kprobe_handler(struct pt_regs *regs)
}
}
static int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
{
kprobe_handler(regs);
return 0;