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1ddc96bd42
Add perf_event_mips_regs/perf_reg_value/perf_reg_validate to support features HAVE_PERF_REGS/HAVE_PERF_USER_STACK_DUMP in kernel. [ayan@wavecomp.com: Repick this patch for unwinding userstack backtrace by perf and libunwind on MIPS based CPU.] [ralf@linux-mips.org: Add perf_get_regs_user() which is required after 'commit88a7c26af8("perf: Move task_pt_regs sampling into arch code")'.] [yangtiezhu@loongson.cn: Fix build error about perf_get_regs_user() after commit76a4efa809("perf/arch: Remove perf_sample_data::regs_user_copy"), and also separate the original patches into two parts (MIPS kernel and perf tools) to merge easily.] The original patches: https://lore.kernel.org/patchwork/patch/1126521/ https://lore.kernel.org/patchwork/patch/1126520/ Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Archer Yan <ayan@wavecomp.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Some parts derived from x86 version of this file.
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*
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* Copyright (C) 2013 Cavium, Inc.
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*/
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#include <linux/perf_event.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_32BIT
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u64 perf_reg_abi(struct task_struct *tsk)
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{
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return PERF_SAMPLE_REGS_ABI_32;
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}
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#else /* Must be CONFIG_64BIT */
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u64 perf_reg_abi(struct task_struct *tsk)
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{
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if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
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return PERF_SAMPLE_REGS_ABI_32;
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else
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return PERF_SAMPLE_REGS_ABI_64;
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}
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#endif /* CONFIG_32BIT */
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int perf_reg_validate(u64 mask)
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{
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if (!mask)
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return -EINVAL;
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if (mask & ~((1ull << PERF_REG_MIPS_MAX) - 1))
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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long v;
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switch (idx) {
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case PERF_REG_MIPS_PC:
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v = regs->cp0_epc;
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break;
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case PERF_REG_MIPS_R1 ... PERF_REG_MIPS_R25:
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v = regs->regs[idx - PERF_REG_MIPS_R1 + 1];
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break;
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case PERF_REG_MIPS_R28 ... PERF_REG_MIPS_R31:
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v = regs->regs[idx - PERF_REG_MIPS_R28 + 28];
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break;
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default:
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WARN_ON_ONCE(1);
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return 0;
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}
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return (s64)v; /* Sign extend if 32-bit. */
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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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regs_user->regs = task_pt_regs(current);
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regs_user->abi = perf_reg_abi(current);
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}
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