diff options
Diffstat (limited to 'samples/kprobes/kprobe_example.c')
| -rw-r--r-- | samples/kprobes/kprobe_example.c | 38 |
1 files changed, 21 insertions, 17 deletions
diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c index 727eb21c9..ed0ca0c07 100644 --- a/samples/kprobes/kprobe_example.c +++ b/samples/kprobes/kprobe_example.c @@ -14,33 +14,37 @@ #include <linux/module.h> #include <linux/kprobes.h> +#define MAX_SYMBOL_LEN 64 +static char symbol[MAX_SYMBOL_LEN] = "_do_fork"; +module_param_string(symbol, symbol, sizeof(symbol), 0644); + /* For each probe you need to allocate a kprobe structure */ static struct kprobe kp = { - .symbol_name = "_do_fork", + .symbol_name = symbol, }; /* kprobe pre_handler: called just before the probed instruction is executed */ static int handler_pre(struct kprobe *p, struct pt_regs *regs) { #ifdef CONFIG_X86 - printk(KERN_INFO "pre_handler: p->addr = 0x%p, ip = %lx," + printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, ip = %lx," " flags = 0x%lx\n", - p->addr, regs->ip, regs->flags); + p->symbol_name, p->addr, regs->ip, regs->flags); #endif #ifdef CONFIG_PPC - printk(KERN_INFO "pre_handler: p->addr = 0x%p, nip = 0x%lx," + printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, nip = 0x%lx," " msr = 0x%lx\n", - p->addr, regs->nip, regs->msr); + p->symbol_name, p->addr, regs->nip, regs->msr); #endif #ifdef CONFIG_MIPS - printk(KERN_INFO "pre_handler: p->addr = 0x%p, epc = 0x%lx," + printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, epc = 0x%lx," " status = 0x%lx\n", - p->addr, regs->cp0_epc, regs->cp0_status); + p->symbol_name, p->addr, regs->cp0_epc, regs->cp0_status); #endif #ifdef CONFIG_TILEGX - printk(KERN_INFO "pre_handler: p->addr = 0x%p, pc = 0x%lx," + printk(KERN_INFO "<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx," " ex1 = 0x%lx\n", - p->addr, regs->pc, regs->ex1); + p->symbol_name, p->addr, regs->pc, regs->ex1); #endif /* A dump_stack() here will give a stack backtrace */ @@ -52,20 +56,20 @@ static void handler_post(struct kprobe *p, struct pt_regs *regs, unsigned long flags) { #ifdef CONFIG_X86 - printk(KERN_INFO "post_handler: p->addr = 0x%p, flags = 0x%lx\n", - p->addr, regs->flags); + printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, flags = 0x%lx\n", + p->symbol_name, p->addr, regs->flags); #endif #ifdef CONFIG_PPC - printk(KERN_INFO "post_handler: p->addr = 0x%p, msr = 0x%lx\n", - p->addr, regs->msr); + printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, msr = 0x%lx\n", + p->symbol_name, p->addr, regs->msr); #endif #ifdef CONFIG_MIPS - printk(KERN_INFO "post_handler: p->addr = 0x%p, status = 0x%lx\n", - p->addr, regs->cp0_status); + printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, status = 0x%lx\n", + p->symbol_name, p->addr, regs->cp0_status); #endif #ifdef CONFIG_TILEGX - printk(KERN_INFO "post_handler: p->addr = 0x%p, ex1 = 0x%lx\n", - p->addr, regs->ex1); + printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, ex1 = 0x%lx\n", + p->symbol_name, p->addr, regs->ex1); #endif } |