1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/perf_event.h> 3 #include <linux/perf_regs.h> 4 #include <linux/kernel.h> 5 #include <linux/errno.h> 6 #include <linux/bug.h> 7 #include <asm/ptrace.h> 8 #include <asm/fpu.h> 9 10 u64 perf_reg_value(struct pt_regs *regs, int idx) 11 { 12 freg_t fp; 13 14 if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15) 15 return regs->gprs[idx]; 16 17 if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) { 18 if (!user_mode(regs)) 19 return 0; 20 21 idx -= PERF_REG_S390_FP0; 22 fp = *(freg_t *)(current->thread.ufpu.vxrs + idx); 23 return fp.ui; 24 } 25 26 if (idx == PERF_REG_S390_MASK) 27 return regs->psw.mask; 28 if (idx == PERF_REG_S390_PC) 29 return regs->psw.addr; 30 31 WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX); 32 return 0; 33 } 34 35 #define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1)) 36 37 int perf_reg_validate(u64 mask) 38 { 39 if (!mask || mask & REG_RESERVED) 40 return -EINVAL; 41 42 return 0; 43 } 44 45 u64 perf_reg_abi(struct task_struct *task) 46 { 47 if (test_tsk_thread_flag(task, TIF_31BIT)) 48 return PERF_SAMPLE_REGS_ABI_32; 49 50 return PERF_SAMPLE_REGS_ABI_64; 51 } 52 53 void perf_get_regs_user(struct perf_regs *regs_user, 54 struct pt_regs *regs) 55 { 56 /* 57 * Use the regs from the first interruption and let 58 * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()). 59 * 60 * Also save FPU registers for user-space tasks only. 61 */ 62 regs_user->regs = task_pt_regs(current); 63 if (user_mode(regs_user->regs)) 64 save_user_fpu_regs(); 65 regs_user->abi = perf_reg_abi(current); 66 } 67