Anju T | ed4a4ef | 2016-02-20 10:32:46 +0530 | [diff] [blame] | 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 | } |