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[PATCH v8 7/7] kprobes: Add arm64 case in kprobe example module

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  [PATCH v8 7/7] kprobes: Add arm64 case in kprobe example module David Long <dave.long@linaro.org> - 2015-08-11 03:00 +0200
    Re: [PATCH v8 7/7] kprobes: Add arm64 case in kprobe example module Steve Capper <steve.capper@linaro.org> - 2015-08-12 18:30 +0200

#1204657 — [PATCH v8 7/7] kprobes: Add arm64 case in kprobe example module

From: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>

Add info prints in sample kprobe handlers for ARM64

Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>
---
 samples/kprobes/kprobe_example.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index 366db1a..51d459c 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -42,6 +42,10 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
 			" ex1 = 0x%lx\n",
 		p->addr, regs->pc, regs->ex1);
 #endif
+#ifdef CONFIG_ARM64
+	pr_info("pre_handler: p->addr = 0x%p, pc = 0x%lx\n",
+		p->addr, (long)regs->pc);
+#endif
 
 	/* A dump_stack() here will give a stack backtrace */
 	return 0;
@@ -67,6 +71,10 @@ static void handler_post(struct kprobe *p, struct pt_regs *regs,
 	printk(KERN_INFO "post_handler: p->addr = 0x%p, ex1 = 0x%lx\n",
 		p->addr, regs->ex1);
 #endif
+#ifdef CONFIG_ARM64
+	pr_info("post_handler: p->addr = 0x%p, pc = 0x%lx\n",
+		p->addr, (long)regs->pc);
+#endif
 }
 
 /*
-- 
1.8.1.2

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#1206240

On 11 August 2015 at 01:52, David Long <dave.long@linaro.org> wrote:
> From: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>
>
> Add info prints in sample kprobe handlers for ARM64
>
> Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>
> ---
>  samples/kprobes/kprobe_example.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

I'm not going through this series backwards, but I did run the kprobe
sample modules first, and nothing happened... (i.e. nothing fired).

The kernel usage of do_fork (which is used as an example by the sample
code) has been changed by:
3033f14a clone: support passing tls argument via C rather than pt_regs magic

Now everything appears to go through _do_fork rather than do_fork.

I'll send a fixup shortly, but if anyone else is running these modules
and worrying about a lack of events... worry less :-).

Cheers,
--
Steve
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