1 /* 2 * Copyright 2016 Anju T, IBM Corporation. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10 #include <linux/errno.h> 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/perf_event.h> 14 #include <linux/bug.h> 15 #include <linux/stddef.h> 16 #include <asm/ptrace.h> 17 #include <asm/perf_regs.h> 18 19 #define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r) 20 21 #define REG_RESERVED (~((1ULL << PERF_REG_POWERPC_MAX) - 1)) 22 23 static unsigned int pt_regs_offset[PERF_REG_POWERPC_MAX] = { 24 PT_REGS_OFFSET(PERF_REG_POWERPC_R0, gpr[0]), 25 PT_REGS_OFFSET(PERF_REG_POWERPC_R1, gpr[1]), 26 PT_REGS_OFFSET(PERF_REG_POWERPC_R2, gpr[2]), 27 PT_REGS_OFFSET(PERF_REG_POWERPC_R3, gpr[3]), 28 PT_REGS_OFFSET(PERF_REG_POWERPC_R4, gpr[4]), 29 PT_REGS_OFFSET(PERF_REG_POWERPC_R5, gpr[5]), 30 PT_REGS_OFFSET(PERF_REG_POWERPC_R6, gpr[6]), 31 PT_REGS_OFFSET(PERF_REG_POWERPC_R7, gpr[7]), 32 PT_REGS_OFFSET(PERF_REG_POWERPC_R8, gpr[8]), 33 PT_REGS_OFFSET(PERF_REG_POWERPC_R9, gpr[9]), 34 PT_REGS_OFFSET(PERF_REG_POWERPC_R10, gpr[10]), 35 PT_REGS_OFFSET(PERF_REG_POWERPC_R11, gpr[11]), 36 PT_REGS_OFFSET(PERF_REG_POWERPC_R12, gpr[12]), 37 PT_REGS_OFFSET(PERF_REG_POWERPC_R13, gpr[13]), 38 PT_REGS_OFFSET(PERF_REG_POWERPC_R14, gpr[14]), 39 PT_REGS_OFFSET(PERF_REG_POWERPC_R15, gpr[15]), 40 PT_REGS_OFFSET(PERF_REG_POWERPC_R16, gpr[16]), 41 PT_REGS_OFFSET(PERF_REG_POWERPC_R17, gpr[17]), 42 PT_REGS_OFFSET(PERF_REG_POWERPC_R18, gpr[18]), 43 PT_REGS_OFFSET(PERF_REG_POWERPC_R19, gpr[19]), 44 PT_REGS_OFFSET(PERF_REG_POWERPC_R20, gpr[20]), 45 PT_REGS_OFFSET(PERF_REG_POWERPC_R21, gpr[21]), 46 PT_REGS_OFFSET(PERF_REG_POWERPC_R22, gpr[22]), 47 PT_REGS_OFFSET(PERF_REG_POWERPC_R23, gpr[23]), 48 PT_REGS_OFFSET(PERF_REG_POWERPC_R24, gpr[24]), 49 PT_REGS_OFFSET(PERF_REG_POWERPC_R25, gpr[25]), 50 PT_REGS_OFFSET(PERF_REG_POWERPC_R26, gpr[26]), 51 PT_REGS_OFFSET(PERF_REG_POWERPC_R27, gpr[27]), 52 PT_REGS_OFFSET(PERF_REG_POWERPC_R28, gpr[28]), 53 PT_REGS_OFFSET(PERF_REG_POWERPC_R29, gpr[29]), 54 PT_REGS_OFFSET(PERF_REG_POWERPC_R30, gpr[30]), 55 PT_REGS_OFFSET(PERF_REG_POWERPC_R31, gpr[31]), 56 PT_REGS_OFFSET(PERF_REG_POWERPC_NIP, nip), 57 PT_REGS_OFFSET(PERF_REG_POWERPC_MSR, msr), 58 PT_REGS_OFFSET(PERF_REG_POWERPC_ORIG_R3, orig_gpr3), 59 PT_REGS_OFFSET(PERF_REG_POWERPC_CTR, ctr), 60 PT_REGS_OFFSET(PERF_REG_POWERPC_LINK, link), 61 PT_REGS_OFFSET(PERF_REG_POWERPC_XER, xer), 62 PT_REGS_OFFSET(PERF_REG_POWERPC_CCR, ccr), 63 #ifdef CONFIG_PPC64 64 PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, softe), 65 #else 66 PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, mq), 67 #endif 68 PT_REGS_OFFSET(PERF_REG_POWERPC_TRAP, trap), 69 PT_REGS_OFFSET(PERF_REG_POWERPC_DAR, dar), 70 PT_REGS_OFFSET(PERF_REG_POWERPC_DSISR, dsisr), 71 }; 72 73 u64 perf_reg_value(struct pt_regs *regs, int idx) 74 { 75 if (WARN_ON_ONCE(idx >= PERF_REG_POWERPC_MAX)) 76 return 0; 77 78 return regs_get_register(regs, pt_regs_offset[idx]); 79 } 80 81 int perf_reg_validate(u64 mask) 82 { 83 if (!mask || mask & REG_RESERVED) 84 return -EINVAL; 85 return 0; 86 } 87 88 u64 perf_reg_abi(struct task_struct *task) 89 { 90 #ifdef CONFIG_PPC64 91 if (!test_tsk_thread_flag(task, TIF_32BIT)) 92 return PERF_SAMPLE_REGS_ABI_64; 93 else 94 #endif 95 return PERF_SAMPLE_REGS_ABI_32; 96 } 97 98 void perf_get_regs_user(struct perf_regs *regs_user, 99 struct pt_regs *regs, 100 struct pt_regs *regs_user_copy) 101 { 102 regs_user->regs = task_pt_regs(current); 103 regs_user->abi = perf_reg_abi(current); 104 } 105