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Linux/arch/arm64/kernel/perf_regs.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/compat.h>
  3 #include <linux/errno.h>
  4 #include <linux/kernel.h>
  5 #include <linux/perf_event.h>
  6 #include <linux/bug.h>
  7 #include <linux/sched/task_stack.h>
  8 
  9 #include <asm/perf_regs.h>
 10 #include <asm/ptrace.h>
 11 
 12 u64 perf_reg_value(struct pt_regs *regs, int idx)
 13 {
 14         if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX))
 15                 return 0;
 16 
 17         /*
 18          * Compat (i.e. 32 bit) mode:
 19          * - PC has been set in the pt_regs struct in kernel_entry,
 20          * - Handle SP and LR here.
 21          */
 22         if (compat_user_mode(regs)) {
 23                 if ((u32)idx == PERF_REG_ARM64_SP)
 24                         return regs->compat_sp;
 25                 if ((u32)idx == PERF_REG_ARM64_LR)
 26                         return regs->compat_lr;
 27         }
 28 
 29         if ((u32)idx == PERF_REG_ARM64_SP)
 30                 return regs->sp;
 31 
 32         if ((u32)idx == PERF_REG_ARM64_PC)
 33                 return regs->pc;
 34 
 35         return regs->regs[idx];
 36 }
 37 
 38 #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
 39 
 40 int perf_reg_validate(u64 mask)
 41 {
 42         if (!mask || mask & REG_RESERVED)
 43                 return -EINVAL;
 44 
 45         return 0;
 46 }
 47 
 48 u64 perf_reg_abi(struct task_struct *task)
 49 {
 50         if (is_compat_thread(task_thread_info(task)))
 51                 return PERF_SAMPLE_REGS_ABI_32;
 52         else
 53                 return PERF_SAMPLE_REGS_ABI_64;
 54 }
 55 
 56 void perf_get_regs_user(struct perf_regs *regs_user,
 57                         struct pt_regs *regs,
 58                         struct pt_regs *regs_user_copy)
 59 {
 60         regs_user->regs = task_pt_regs(current);
 61         regs_user->abi = perf_reg_abi(current);
 62 }
 63 

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