projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2ee0d7fd JP |
2 | #include <linux/errno.h> |
| 3 | #include <linux/kernel.h> | |
| 4 | #include <linux/perf_event.h> | |
| 5 | #include <linux/bug.h> | |
| 68db0cf1 | 6 | #include <linux/sched/task_stack.h> |
| ff268ff7 MS |
7 | |
| 8 | #include <asm/compat.h> | |
| 2ee0d7fd JP |
9 | #include <asm/perf_regs.h> |
| 10 | #include <asm/ptrace.h> | |
| 11 | ||
| 12 | u64 perf_reg_value(struct pt_regs *regs, int idx) | |
| 13 | { | |
| 14 | if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX)) | |
| 15 | return 0; | |
| 16 | ||
| 17 | /* | |
| 18 | * Compat (i.e. 32 bit) mode: | |
| 19 | * - PC has been set in the pt_regs struct in kernel_entry, | |
| 20 | * - Handle SP and LR here. | |
| 21 | */ | |
| 22 | if (compat_user_mode(regs)) { | |
| 23 | if ((u32)idx == PERF_REG_ARM64_SP) | |
| 24 | return regs->compat_sp; | |
| 25 | if ((u32)idx == PERF_REG_ARM64_LR) | |
| 26 | return regs->compat_lr; | |
| 27 | } | |
| 28 | ||
| 5b75a6af WD |
29 | if ((u32)idx == PERF_REG_ARM64_SP) |
| 30 | return regs->sp; | |
| 31 | ||
| 32 | if ((u32)idx == PERF_REG_ARM64_PC) | |
| 33 | return regs->pc; | |
| 34 | ||
| 2ee0d7fd JP |
35 | return regs->regs[idx]; |
| 36 | } | |
| 37 | ||
| 38 | #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1)) | |
| 39 | ||
| 40 | int perf_reg_validate(u64 mask) | |
| 41 | { | |
| 42 | if (!mask || mask & REG_RESERVED) | |
| 43 | return -EINVAL; | |
| 44 | ||
| 45 | return 0; | |
| 46 | } | |
| 47 | ||
| 48 | u64 perf_reg_abi(struct task_struct *task) | |
| 49 | { | |
| 50 | if (is_compat_thread(task_thread_info(task))) | |
| 51 | return PERF_SAMPLE_REGS_ABI_32; | |
| 52 | else | |
| 53 | return PERF_SAMPLE_REGS_ABI_64; | |
| 54 | } | |
| 88a7c26a AL |
55 | |
| 56 | void perf_get_regs_user(struct perf_regs *regs_user, | |
| 57 | struct pt_regs *regs, | |
| 58 | struct pt_regs *regs_user_copy) | |
| 59 | { | |
| 60 | regs_user->regs = task_pt_regs(current); | |
| 61 | regs_user->abi = perf_reg_abi(current); | |
| 62 | } |