mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-21 10:05:00 +08:00
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>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Some parts derived from x86 version of this file.
|
|
*
|
|
* Copyright (C) 2013 Cavium, Inc.
|
|
*/
|
|
|
|
#include <linux/perf_event.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
|
|
#ifdef CONFIG_32BIT
|
|
u64 perf_reg_abi(struct task_struct *tsk)
|
|
{
|
|
return PERF_SAMPLE_REGS_ABI_32;
|
|
}
|
|
#else /* Must be CONFIG_64BIT */
|
|
u64 perf_reg_abi(struct task_struct *tsk)
|
|
{
|
|
if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
|
|
return PERF_SAMPLE_REGS_ABI_32;
|
|
else
|
|
return PERF_SAMPLE_REGS_ABI_64;
|
|
}
|
|
#endif /* CONFIG_32BIT */
|
|
|
|
int perf_reg_validate(u64 mask)
|
|
{
|
|
if (!mask)
|
|
return -EINVAL;
|
|
if (mask & ~((1ull << PERF_REG_MIPS_MAX) - 1))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
u64 perf_reg_value(struct pt_regs *regs, int idx)
|
|
{
|
|
long v;
|
|
|
|
switch (idx) {
|
|
case PERF_REG_MIPS_PC:
|
|
v = regs->cp0_epc;
|
|
break;
|
|
case PERF_REG_MIPS_R1 ... PERF_REG_MIPS_R25:
|
|
v = regs->regs[idx - PERF_REG_MIPS_R1 + 1];
|
|
break;
|
|
case PERF_REG_MIPS_R28 ... PERF_REG_MIPS_R31:
|
|
v = regs->regs[idx - PERF_REG_MIPS_R28 + 28];
|
|
break;
|
|
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return 0;
|
|
}
|
|
|
|
return (s64)v; /* Sign extend if 32-bit. */
|
|
}
|
|
|
|
void perf_get_regs_user(struct perf_regs *regs_user,
|
|
struct pt_regs *regs)
|
|
{
|
|
regs_user->regs = task_pt_regs(current);
|
|
regs_user->abi = perf_reg_abi(current);
|
|
}
|