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 if ((u32)idx == PERF_REG_ARM64_SP) 28 return regs->sp; 29 30 if ((u32)idx == PERF_REG_ARM64_PC) 31 return regs->pc; 32 33 return regs->regs[idx]; 34 } 35 36 #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1)) 37 38 int perf_reg_validate(u64 mask) 39 { 40 if (!mask || mask & REG_RESERVED) 41 return -EINVAL; 42 43 return 0; 44 } 45 46 u64 perf_reg_abi(struct task_struct *task) 47 { 48 if (is_compat_thread(task_thread_info(task))) 49 return PERF_SAMPLE_REGS_ABI_32; 50 else 51 return PERF_SAMPLE_REGS_ABI_64; 52 } 53 54 void perf_get_regs_user(struct perf_regs *regs_user, 55 struct pt_regs *regs, 56 struct pt_regs *regs_user_copy) 57 { 58 regs_user->regs = task_pt_regs(current); 59 regs_user->abi = perf_reg_abi(current); 60 } 61