mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-01 08:04:22 +08:00
a6484baa3b
Add LoongArch specific info in handler_pre() and handler_post(). Tested-by: Jeff Xie <xiehuan09@gmail.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Here's a sample kernel module showing the use of kprobes to dump a
|
|
* stack trace and selected registers when kernel_clone() is called.
|
|
*
|
|
* For more information on theory of operation of kprobes, see
|
|
* Documentation/trace/kprobes.rst
|
|
*
|
|
* You will see the trace data in /var/log/messages and on the console
|
|
* whenever kernel_clone() is invoked to create a new process.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kprobes.h>
|
|
|
|
static char symbol[KSYM_NAME_LEN] = "kernel_clone";
|
|
module_param_string(symbol, symbol, KSYM_NAME_LEN, 0644);
|
|
|
|
/* For each probe you need to allocate a kprobe structure */
|
|
static struct kprobe kp = {
|
|
.symbol_name = symbol,
|
|
};
|
|
|
|
/* kprobe pre_handler: called just before the probed instruction is executed */
|
|
static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_X86
|
|
pr_info("<%s> p->addr = 0x%p, ip = %lx, flags = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->ip, regs->flags);
|
|
#endif
|
|
#ifdef CONFIG_PPC
|
|
pr_info("<%s> p->addr = 0x%p, nip = 0x%lx, msr = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->nip, regs->msr);
|
|
#endif
|
|
#ifdef CONFIG_MIPS
|
|
pr_info("<%s> p->addr = 0x%p, epc = 0x%lx, status = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->cp0_epc, regs->cp0_status);
|
|
#endif
|
|
#ifdef CONFIG_ARM64
|
|
pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, pstate = 0x%lx\n",
|
|
p->symbol_name, p->addr, (long)regs->pc, (long)regs->pstate);
|
|
#endif
|
|
#ifdef CONFIG_ARM
|
|
pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, cpsr = 0x%lx\n",
|
|
p->symbol_name, p->addr, (long)regs->ARM_pc, (long)regs->ARM_cpsr);
|
|
#endif
|
|
#ifdef CONFIG_RISCV
|
|
pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, status = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->epc, regs->status);
|
|
#endif
|
|
#ifdef CONFIG_S390
|
|
pr_info("<%s> p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->psw.addr, regs->flags);
|
|
#endif
|
|
#ifdef CONFIG_LOONGARCH
|
|
pr_info("<%s> p->addr = 0x%p, era = 0x%lx, estat = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->csr_era, regs->csr_estat);
|
|
#endif
|
|
|
|
/* A dump_stack() here will give a stack backtrace */
|
|
return 0;
|
|
}
|
|
|
|
/* kprobe post_handler: called after the probed instruction is executed */
|
|
static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
|
|
unsigned long flags)
|
|
{
|
|
#ifdef CONFIG_X86
|
|
pr_info("<%s> p->addr = 0x%p, flags = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->flags);
|
|
#endif
|
|
#ifdef CONFIG_PPC
|
|
pr_info("<%s> p->addr = 0x%p, msr = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->msr);
|
|
#endif
|
|
#ifdef CONFIG_MIPS
|
|
pr_info("<%s> p->addr = 0x%p, status = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->cp0_status);
|
|
#endif
|
|
#ifdef CONFIG_ARM64
|
|
pr_info("<%s> p->addr = 0x%p, pstate = 0x%lx\n",
|
|
p->symbol_name, p->addr, (long)regs->pstate);
|
|
#endif
|
|
#ifdef CONFIG_ARM
|
|
pr_info("<%s> p->addr = 0x%p, cpsr = 0x%lx\n",
|
|
p->symbol_name, p->addr, (long)regs->ARM_cpsr);
|
|
#endif
|
|
#ifdef CONFIG_RISCV
|
|
pr_info("<%s> p->addr = 0x%p, status = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->status);
|
|
#endif
|
|
#ifdef CONFIG_S390
|
|
pr_info("<%s> p->addr, 0x%p, flags = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->flags);
|
|
#endif
|
|
#ifdef CONFIG_LOONGARCH
|
|
pr_info("<%s> p->addr = 0x%p, estat = 0x%lx\n",
|
|
p->symbol_name, p->addr, regs->csr_estat);
|
|
#endif
|
|
}
|
|
|
|
static int __init kprobe_init(void)
|
|
{
|
|
int ret;
|
|
kp.pre_handler = handler_pre;
|
|
kp.post_handler = handler_post;
|
|
|
|
ret = register_kprobe(&kp);
|
|
if (ret < 0) {
|
|
pr_err("register_kprobe failed, returned %d\n", ret);
|
|
return ret;
|
|
}
|
|
pr_info("Planted kprobe at %p\n", kp.addr);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit kprobe_exit(void)
|
|
{
|
|
unregister_kprobe(&kp);
|
|
pr_info("kprobe at %p unregistered\n", kp.addr);
|
|
}
|
|
|
|
module_init(kprobe_init)
|
|
module_exit(kprobe_exit)
|
|
MODULE_LICENSE("GPL");
|