| 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(tsk: task, flag: 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: regs_user->regs)) |
| 64 | save_user_fpu_regs(); |
| 65 | regs_user->abi = perf_reg_abi(current); |
| 66 | } |
| 67 |