1 #include <linux/errno.h> 2 #include <linux/kernel.h> 3 #include <linux/perf_event.h> 4 #include <linux/bug.h> 5 6 #include <asm/compat.h> 7 #include <asm/perf_regs.h> 8 #include <asm/ptrace.h> 9 10 u64 perf_reg_value(struct pt_regs *regs, int idx) 11 { 12 if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX)) 13 return 0; 14 15 /* 16 * Compat (i.e. 32 bit) mode: 17 * - PC has been set in the pt_regs struct in kernel_entry, 18 * - Handle SP and LR here. 19 */ 20 if (compat_user_mode(regs)) { 21 if ((u32)idx == PERF_REG_ARM64_SP) 22 return regs->compat_sp; 23 if ((u32)idx == PERF_REG_ARM64_LR) 24 return regs->compat_lr; 25 } 26 27 return regs->regs[idx]; 28 } 29 30 #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1)) 31 32 int perf_reg_validate(u64 mask) 33 { 34 if (!mask || mask & REG_RESERVED) 35 return -EINVAL; 36 37 return 0; 38 } 39 40 u64 perf_reg_abi(struct task_struct *task) 41 { 42 if (is_compat_thread(task_thread_info(task))) 43 return PERF_SAMPLE_REGS_ABI_32; 44 else 45 return PERF_SAMPLE_REGS_ABI_64; 46 } 47