mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-10 20:44:09 +08:00
ad14c19242
arch/arm64/include/asm/cpu_ops.h:24: necesary ==> necessary arch/arm64/include/asm/kvm_arm.h:69: maintainance ==> maintenance arch/arm64/include/asm/cpufeature.h:361: capabilties ==> capabilities arch/arm64/kernel/perf_regs.c:19: compatability ==> compatibility arch/arm64/kernel/smp_spin_table.c:86: endianess ==> endianness arch/arm64/kernel/smp_spin_table.c:88: endianess ==> endianness arch/arm64/kvm/vgic/vgic-mmio-v3.c:1004: targetting ==> targeting arch/arm64/kvm/vgic/vgic-mmio-v3.c:1005: targetting ==> targeting Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Link: https://lore.kernel.org/r/20200828031822.35928-1-nixiaoming@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/compat.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/sched/task_stack.h>
|
|
|
|
#include <asm/perf_regs.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
u64 perf_reg_value(struct pt_regs *regs, int idx)
|
|
{
|
|
if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX))
|
|
return 0;
|
|
|
|
/*
|
|
* Our handling of compat tasks (PERF_SAMPLE_REGS_ABI_32) is weird, but
|
|
* we're stuck with it for ABI compatibility reasons.
|
|
*
|
|
* For a 32-bit consumer inspecting a 32-bit task, then it will look at
|
|
* the first 16 registers (see arch/arm/include/uapi/asm/perf_regs.h).
|
|
* These correspond directly to a prefix of the registers saved in our
|
|
* 'struct pt_regs', with the exception of the PC, so we copy that down
|
|
* (x15 corresponds to SP_hyp in the architecture).
|
|
*
|
|
* So far, so good.
|
|
*
|
|
* The oddity arises when a 64-bit consumer looks at a 32-bit task and
|
|
* asks for registers beyond PERF_REG_ARM_MAX. In this case, we return
|
|
* SP_usr, LR_usr and PC in the positions where the AArch64 SP, LR and
|
|
* PC registers would normally live. The initial idea was to allow a
|
|
* 64-bit unwinder to unwind a 32-bit task and, although it's not clear
|
|
* how well that works in practice, somebody might be relying on it.
|
|
*
|
|
* At the time we make a sample, we don't know whether the consumer is
|
|
* 32-bit or 64-bit, so we have to cater for both possibilities.
|
|
*/
|
|
if (compat_user_mode(regs)) {
|
|
if ((u32)idx == PERF_REG_ARM64_SP)
|
|
return regs->compat_sp;
|
|
if ((u32)idx == PERF_REG_ARM64_LR)
|
|
return regs->compat_lr;
|
|
if (idx == 15)
|
|
return regs->pc;
|
|
}
|
|
|
|
if ((u32)idx == PERF_REG_ARM64_SP)
|
|
return regs->sp;
|
|
|
|
if ((u32)idx == PERF_REG_ARM64_PC)
|
|
return regs->pc;
|
|
|
|
return regs->regs[idx];
|
|
}
|
|
|
|
#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_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 (is_compat_thread(task_thread_info(task)))
|
|
return PERF_SAMPLE_REGS_ABI_32;
|
|
else
|
|
return PERF_SAMPLE_REGS_ABI_64;
|
|
}
|
|
|
|
void perf_get_regs_user(struct perf_regs *regs_user,
|
|
struct pt_regs *regs,
|
|
struct pt_regs *regs_user_copy)
|
|
{
|
|
regs_user->regs = task_pt_regs(current);
|
|
regs_user->abi = perf_reg_abi(current);
|
|
}
|