mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 06:04:14 +08:00
88a7c26af8
On x86_64, at least, task_pt_regs may be only partially initialized in many contexts, so x86_64 should not use it without extra care from interrupt context, let alone NMI context. This will allow x86_64 to override the logic and will supply some scratch space to use to make a cleaner copy of user regs. Tested-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: chenggang.qcg@taobao.com Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Salter <msalter@redhat.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/e431cd4c18c2e1c44c774f10758527fb2d1025c4.1420396372.git.luto@amacapital.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/bug.h>
|
|
|
|
#include <asm/compat.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;
|
|
|
|
/*
|
|
* Compat (i.e. 32 bit) mode:
|
|
* - PC has been set in the pt_regs struct in kernel_entry,
|
|
* - Handle SP and LR here.
|
|
*/
|
|
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 ((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);
|
|
}
|