63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/perf_event.h>
|
||
|
|
#include <linux/bug.h>
|
||
|
|
#include <linux/sched/task_stack.h>
|
||
|
|
|
||
|
|
#include <asm/compat.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_ARM64_MAX))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compat (i.e. 32 bit) mode:
|
||
|
|
* - PC has been set in the pt_regs struct in kernel_entry,
|
||
|
|
* - Handle SP and LR here.
|
||
|
|
*/
|
||
|
|
if (compat_user_mode(regs)) {
|
||
|
|
if ((u32)idx == PERF_REG_ARM64_SP)
|
||
|
|
return regs->compat_sp;
|
||
|
|
if ((u32)idx == PERF_REG_ARM64_LR)
|
||
|
|
return regs->compat_lr;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((u32)idx == PERF_REG_ARM64_SP)
|
||
|
|
return regs->sp;
|
||
|
|
|
||
|
|
if ((u32)idx == PERF_REG_ARM64_PC)
|
||
|
|
return regs->pc;
|
||
|
|
|
||
|
|
return regs->regs[idx];
|
||
|
|
}
|
||
|
|
|
||
|
|
#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_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)
|
||
|
|
{
|
||
|
|
if (is_compat_thread(task_thread_info(task)))
|
||
|
|
return PERF_SAMPLE_REGS_ABI_32;
|
||
|
|
else
|
||
|
|
return PERF_SAMPLE_REGS_ABI_64;
|
||
|
|
}
|
||
|
|
|
||
|
|
void perf_get_regs_user(struct perf_regs *regs_user,
|
||
|
|
struct pt_regs *regs,
|
||
|
|
struct pt_regs *regs_user_copy)
|
||
|
|
{
|
||
|
|
regs_user->regs = task_pt_regs(current);
|
||
|
|
regs_user->abi = perf_reg_abi(current);
|
||
|
|
}
|