mirror of
https://github.com/tbsdtv/linux_media.git
synced 2025-07-23 12:43:29 +02:00
f94909ceb1
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
69 lines
1.7 KiB
ArmAsm
69 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#include <linux/stringify.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/dwarf2.h>
|
|
#include <asm/cpufeatures.h>
|
|
#include <asm/alternative.h>
|
|
#include <asm/export.h>
|
|
#include <asm/nospec-branch.h>
|
|
#include <asm/unwind_hints.h>
|
|
#include <asm/frame.h>
|
|
|
|
.section .text.__x86.indirect_thunk
|
|
|
|
.macro RETPOLINE reg
|
|
ANNOTATE_INTRA_FUNCTION_CALL
|
|
call .Ldo_rop_\@
|
|
.Lspec_trap_\@:
|
|
UNWIND_HINT_EMPTY
|
|
pause
|
|
lfence
|
|
jmp .Lspec_trap_\@
|
|
.Ldo_rop_\@:
|
|
mov %\reg, (%_ASM_SP)
|
|
UNWIND_HINT_FUNC
|
|
RET
|
|
.endm
|
|
|
|
.macro THUNK reg
|
|
|
|
.align RETPOLINE_THUNK_SIZE
|
|
SYM_INNER_LABEL(__x86_indirect_thunk_\reg, SYM_L_GLOBAL)
|
|
UNWIND_HINT_EMPTY
|
|
|
|
ALTERNATIVE_2 __stringify(ANNOTATE_RETPOLINE_SAFE; jmp *%\reg), \
|
|
__stringify(RETPOLINE \reg), X86_FEATURE_RETPOLINE, \
|
|
__stringify(lfence; ANNOTATE_RETPOLINE_SAFE; jmp *%\reg), X86_FEATURE_RETPOLINE_AMD
|
|
|
|
.endm
|
|
|
|
/*
|
|
* Despite being an assembler file we can't just use .irp here
|
|
* because __KSYM_DEPS__ only uses the C preprocessor and would
|
|
* only see one instance of "__x86_indirect_thunk_\reg" rather
|
|
* than one per register with the correct names. So we do it
|
|
* the simple and nasty way...
|
|
*
|
|
* Worse, you can only have a single EXPORT_SYMBOL per line,
|
|
* and CPP can't insert newlines, so we have to repeat everything
|
|
* at least twice.
|
|
*/
|
|
|
|
#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym)
|
|
#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg)
|
|
|
|
.align RETPOLINE_THUNK_SIZE
|
|
SYM_CODE_START(__x86_indirect_thunk_array)
|
|
|
|
#define GEN(reg) THUNK reg
|
|
#include <asm/GEN-for-each-reg.h>
|
|
#undef GEN
|
|
|
|
.align RETPOLINE_THUNK_SIZE
|
|
SYM_CODE_END(__x86_indirect_thunk_array)
|
|
|
|
#define GEN(reg) EXPORT_THUNK(reg)
|
|
#include <asm/GEN-for-each-reg.h>
|
|
#undef GEN
|