arm/kernel/perf_regs.c

0001 // SPDX-License-Identifier: GPL-2.0
0002
0003 #include <linux/errno.h>
0004 #include <linux/kernel.h>
0005 #include <linux/perf_event.h>
0006 #include <linux/bug.h>
0007 #include <linux/sched/task_stack.h>
0008 #include <asm/perf_regs.h>
0009 #include <asm/ptrace.h>
0010
0011 u64 perf_reg_value(struct pt_regs *regs, int idx)
0012 {
0013     if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM_MAX))
0014         return 0;
0015
0016     return regs->uregs[idx];
0017 }
0018
0019 #define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
0020
0021 int perf_reg_validate(u64 mask)
0022 {
0023     if (!mask || mask & REG_RESERVED)
0024         return -EINVAL;
0025
0026     return 0;
0027 }
0028
0029 u64 perf_reg_abi(struct task_struct *task)
0030 {
0031     return PERF_SAMPLE_REGS_ABI_32;
0032 }
0033
0034 void perf_get_regs_user(struct perf_regs *regs_user,
0035             struct pt_regs *regs)
0036 {
0037     regs_user->regs = task_pt_regs(current);
0038     regs_user->abi = perf_reg_abi(current);
0039 }