linux-stable/arch/x86/entry/thunk_64.S
Peter Zijlstra f94909ceb1 x86: Prepare asm files for straight-line-speculation
Replace all ret/retq instructions with RET in preparation of making
RET a macro. Since AS is case insensitive it's a big no-op without
RET defined.

  find arch/x86/ -name \*.S | while read file
  do
	sed -i 's/\<ret[q]*\>/RET/' $file
  done

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211204134907.905503893@infradead.org
2021-12-08 12:25:37 +01:00

56 lines
1.1 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Save registers before calling assembly functions. This avoids
* disturbance of register allocation in some inline assembly constructs.
* Copyright 2001,2002 by Andi Kleen, SuSE Labs.
*/
#include <linux/linkage.h>
#include "calling.h"
#include <asm/asm.h>
#include <asm/export.h>
/* rdi: arg1 ... normal C conventions. rax is saved/restored. */
.macro THUNK name, func
SYM_FUNC_START_NOALIGN(\name)
pushq %rbp
movq %rsp, %rbp
pushq %rdi
pushq %rsi
pushq %rdx
pushq %rcx
pushq %rax
pushq %r8
pushq %r9
pushq %r10
pushq %r11
call \func
jmp __thunk_restore
SYM_FUNC_END(\name)
_ASM_NOKPROBE(\name)
.endm
#ifdef CONFIG_PREEMPTION
THUNK preempt_schedule_thunk, preempt_schedule
THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
EXPORT_SYMBOL(preempt_schedule_thunk)
EXPORT_SYMBOL(preempt_schedule_notrace_thunk)
#endif
#ifdef CONFIG_PREEMPTION
SYM_CODE_START_LOCAL_NOALIGN(__thunk_restore)
popq %r11
popq %r10
popq %r9
popq %r8
popq %rax
popq %rcx
popq %rdx
popq %rsi
popq %rdi
popq %rbp
RET
_ASM_NOKPROBE(__thunk_restore)
SYM_CODE_END(__thunk_restore)
#endif