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riscv: ftrace: Use ftrace_get_regs helper

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Use ftrace_get_regs() helper call to get pt_regs from ftrace_regs struct,
this makes the code simpler.

Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Nanyong Sun 2021-03-05 19:33:31 +08:00 committed by Palmer Dabbelt
parent 86b276c1dd
commit 288f6775a0
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 9 additions and 7 deletions
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16
arch/riscv/kernel/probes/ftrace.c
View File

@ -4,37 +4,39 @@
/* Ftrace callback handler for kprobes -- called under preepmt disabed */
void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *ops, struct ftrace_regs *regs)
struct ftrace_ops *ops, struct ftrace_regs *fregs)
{
struct kprobe *p;
struct pt_regs *regs;
struct kprobe_ctlblk *kcb;
p = get_kprobe((kprobe_opcode_t *)ip);
if (unlikely(!p) || kprobe_disabled(p))
return;
regs = ftrace_get_regs(fregs);
kcb = get_kprobe_ctlblk();
if (kprobe_running()) {
kprobes_inc_nmissed_count(p);
} else {
unsigned long orig_ip = instruction_pointer(&(regs->regs));
unsigned long orig_ip = instruction_pointer(regs);
instruction_pointer_set(&(regs->regs), ip);
instruction_pointer_set(regs, ip);
__this_cpu_write(current_kprobe, p);
kcb->kprobe_status = KPROBE_HIT_ACTIVE;
if (!p->pre_handler || !p->pre_handler(p, &(regs->regs))) {
if (!p->pre_handler || !p->pre_handler(p, regs)) {
/*
* Emulate singlestep (and also recover regs->pc)
* as if there is a nop
*/
instruction_pointer_set(&(regs->regs),
instruction_pointer_set(regs,
(unsigned long)p->addr + MCOUNT_INSN_SIZE);
if (unlikely(p->post_handler)) {
kcb->kprobe_status = KPROBE_HIT_SSDONE;
p->post_handler(p, &(regs->regs), 0);
p->post_handler(p, regs, 0);
}
instruction_pointer_set(&(regs->regs), orig_ip);
instruction_pointer_set(regs, orig_ip);
}
/*