mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 14:14:24 +08:00
76a4efa809
struct perf_sample_data lives on-stack, we should be careful about it's size. Furthermore, the pt_regs copy in there is only because x86_64 is a trainwreck, solve it differently. Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Steven Rostedt <rostedt@goodmis.org> Link: https://lkml.kernel.org/r/20201030151955.258178461@infradead.org
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/perf_event.h>
|
|
#include <linux/perf_regs.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/bug.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/fpu/api.h>
|
|
#include <asm/fpu/types.h>
|
|
|
|
u64 perf_reg_value(struct pt_regs *regs, int idx)
|
|
{
|
|
freg_t fp;
|
|
|
|
if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
|
|
return regs->gprs[idx];
|
|
|
|
if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
|
|
if (!user_mode(regs))
|
|
return 0;
|
|
|
|
idx -= PERF_REG_S390_FP0;
|
|
fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx)
|
|
: current->thread.fpu.fprs[idx];
|
|
return fp.ui;
|
|
}
|
|
|
|
if (idx == PERF_REG_S390_MASK)
|
|
return regs->psw.mask;
|
|
if (idx == PERF_REG_S390_PC)
|
|
return regs->psw.addr;
|
|
|
|
WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX);
|
|
return 0;
|
|
}
|
|
|
|
#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
|
|
|
|
int perf_reg_validate(u64 mask)
|
|
{
|
|
if (!mask || mask & REG_RESERVED)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u64 perf_reg_abi(struct task_struct *task)
|
|
{
|
|
if (test_tsk_thread_flag(task, TIF_31BIT))
|
|
return PERF_SAMPLE_REGS_ABI_32;
|
|
|
|
return PERF_SAMPLE_REGS_ABI_64;
|
|
}
|
|
|
|
void perf_get_regs_user(struct perf_regs *regs_user,
|
|
struct pt_regs *regs)
|
|
{
|
|
/*
|
|
* Use the regs from the first interruption and let
|
|
* perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
|
|
*
|
|
* Also save FPU registers for user-space tasks only.
|
|
*/
|
|
regs_user->regs = task_pt_regs(current);
|
|
if (user_mode(regs_user->regs))
|
|
save_fpu_regs();
|
|
regs_user->abi = perf_reg_abi(current);
|
|
}
|