1 #include <linux/errno.h>
2 #include <linux/kernel.h>
3 #include <linux/perf_event.h>
5 #include <linux/sched/task_stack.h>
7 #include <asm/compat.h>
8 #include <asm/perf_regs.h>
9 #include <asm/ptrace.h>
11 u64 perf_reg_value(struct pt_regs *regs, int idx)
13 if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX))
17 * Compat (i.e. 32 bit) mode:
18 * - PC has been set in the pt_regs struct in kernel_entry,
19 * - Handle SP and LR here.
21 if (compat_user_mode(regs)) {
22 if ((u32)idx == PERF_REG_ARM64_SP)
23 return regs->compat_sp;
24 if ((u32)idx == PERF_REG_ARM64_LR)
25 return regs->compat_lr;
28 if ((u32)idx == PERF_REG_ARM64_SP)
31 if ((u32)idx == PERF_REG_ARM64_PC)
34 return regs->regs[idx];
37 #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
39 int perf_reg_validate(u64 mask)
41 if (!mask || mask & REG_RESERVED)
47 u64 perf_reg_abi(struct task_struct *task)
49 if (is_compat_thread(task_thread_info(task)))
50 return PERF_SAMPLE_REGS_ABI_32;
52 return PERF_SAMPLE_REGS_ABI_64;
55 void perf_get_regs_user(struct perf_regs *regs_user,
57 struct pt_regs *regs_user_copy)
59 regs_user->regs = task_pt_regs(current);
60 regs_user->abi = perf_reg_abi(current);