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68 lines
1.5 KiB
68 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/perf_event.h> |
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#include <linux/perf_regs.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/bug.h> |
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#include <asm/ptrace.h> |
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#include <asm/fpu/api.h> |
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#include <asm/fpu/types.h> |
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u64 perf_reg_value(struct pt_regs *regs, int idx) |
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{ |
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freg_t fp; |
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if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15) |
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return regs->gprs[idx]; |
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if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) { |
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if (!user_mode(regs)) |
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return 0; |
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idx -= PERF_REG_S390_FP0; |
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fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx) |
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: current->thread.fpu.fprs[idx]; |
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return fp.ui; |
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} |
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if (idx == PERF_REG_S390_MASK) |
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return regs->psw.mask; |
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if (idx == PERF_REG_S390_PC) |
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return regs->psw.addr; |
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WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX); |
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return 0; |
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} |
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#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1)) |
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int perf_reg_validate(u64 mask) |
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{ |
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if (!mask || mask & REG_RESERVED) |
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return -EINVAL; |
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return 0; |
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} |
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u64 perf_reg_abi(struct task_struct *task) |
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{ |
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if (test_tsk_thread_flag(task, TIF_31BIT)) |
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return PERF_SAMPLE_REGS_ABI_32; |
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return PERF_SAMPLE_REGS_ABI_64; |
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} |
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void perf_get_regs_user(struct perf_regs *regs_user, |
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struct pt_regs *regs) |
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{ |
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/* |
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* Use the regs from the first interruption and let |
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* perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()). |
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* |
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* Also save FPU registers for user-space tasks only. |
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*/ |
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regs_user->regs = task_pt_regs(current); |
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if (user_mode(regs_user->regs)) |
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save_fpu_regs(); |
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regs_user->abi = perf_reg_abi(current); |
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}
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