mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 16:44:10 +08:00
49863894db
This patch implements the functions required for the perf registers API, allowing the perf tool to interface kernel register dumps with libunwind in order to provide userspace backtracing. Cc: Jean Pihet <jean.pihet@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
31 lines
540 B
C
31 lines
540 B
C
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/bug.h>
|
|
#include <asm/perf_regs.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
u64 perf_reg_value(struct pt_regs *regs, int idx)
|
|
{
|
|
if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM_MAX))
|
|
return 0;
|
|
|
|
return regs->uregs[idx];
|
|
}
|
|
|
|
#define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
|
|
|
|
int perf_reg_validate(u64 mask)
|
|
{
|
|
if (!mask || mask & REG_RESERVED)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u64 perf_reg_abi(struct task_struct *task)
|
|
{
|
|
return PERF_SAMPLE_REGS_ABI_32;
|
|
}
|