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riscv: Add perf callchain support

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This patch add support for perf callchain sampling on riscv platforms.
The return address of leaf function is retrieved from pt_regs as
it is not saved in the outmost frame.

Signed-off-by: Mao Han <han_mao@c-sky.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: linux-riscv <linux-riscv@lists.infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Guo Ren <guoren@kernel.org>
Tested-by: Greentime Hu <greentime.hu@sifive.com>
[paul.walmsley@sifive.com: fixed some 'checkpatch.pl --strict' issues;
 fixed patch description spelling]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Mao Han
2019-08-29 14:57:00 +08:00
committed by Paul Walmsley
parent 909548d6c5
commit dbeb90b0c1
4 changed files with 101 additions and 3 deletions
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4
arch/riscv/kernel/stacktrace.c
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@@ -19,8 +19,8 @@ struct stackframe {
unsigned long ra;
};
static void notrace walk_stackframe(struct task_struct *task,
struct pt_regs *regs, bool (*fn)(unsigned long, void *), void *arg)
void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
bool (*fn)(unsigned long, void *), void *arg)
{
unsigned long fp, sp, pc;