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[PATCH] Kprobes/IA64: architecture specific JProbes support

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This patch adds IA64 architecture specific JProbes support on top of Kprobes

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Rusty Lynch <Rusty.lynch@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Anil S Keshavamurthy
2005-06-23 00:09:28 -07:00
committed by Linus Torvalds
parent fd7b231ff9
commit b2761dc262
4 changed files with 89 additions and 7 deletions
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28
arch/ia64/kernel/kprobes.c
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@@ -35,12 +35,15 @@
#include <asm/pgtable.h>
#include <asm/kdebug.h>
extern void jprobe_inst_return(void);
/* kprobe_status settings */
#define KPROBE_HIT_ACTIVE 0x00000001
#define KPROBE_HIT_SS 0x00000002
static struct kprobe *current_kprobe;
static unsigned long kprobe_status;
static struct pt_regs jprobe_saved_regs;
enum instruction_type {A, I, M, F, B, L, X, u};
static enum instruction_type bundle_encoding[32][3] = {
@@ -318,15 +321,28 @@ int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
printk(KERN_WARNING "Jprobes is not supported\n");
return 0;
}
struct jprobe *jp = container_of(p, struct jprobe, kp);
unsigned long addr = ((struct fnptr *)(jp->entry))->ip;
void jprobe_return(void)
{
/* save architectural state */
jprobe_saved_regs = *regs;
/* after rfi, execute the jprobe instrumented function */
regs->cr_iip = addr & ~0xFULL;
ia64_psr(regs)->ri = addr & 0xf;
regs->r1 = ((struct fnptr *)(jp->entry))->gp;
/*
* fix the return address to our jprobe_inst_return() function
* in the jprobes.S file
*/
regs->b0 = ((struct fnptr *)(jprobe_inst_return))->ip;
return 1;
}
int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
{
return 0;
*regs = jprobe_saved_regs;
return 1;
}