mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 13:52:50 +01:00
Mark Brown
3630e82ab6
In preparation for adding arm64 GCS support make the map_shadow_stack() SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing flag indicates that a token usable for stack switch should be added to the top of the newly mapped GCS region while the new flag indicates that a top of stack marker suitable for use by unwinders should be added above that. For arm64 the top of stack marker is all bits 0. Reviewed-by: Thiago Jung Bauermann <[email protected]> Reviewed-by: Catalin Marinas <[email protected]> Acked-by: Yury Khrustalev <[email protected]> Signed-off-by: Mark Brown <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Catalin Marinas <[email protected]>
27 lines
941 B
C
27 lines
941 B
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
#ifndef __ASM_GENERIC_MMAN_H
|
|
#define __ASM_GENERIC_MMAN_H
|
|
|
|
#include <asm-generic/mman-common.h>
|
|
|
|
#define MAP_GROWSDOWN 0x0100 /* stack-like segment */
|
|
#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
|
|
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
|
|
#define MAP_LOCKED 0x2000 /* pages are locked */
|
|
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
|
|
|
|
/*
|
|
* Bits [26:31] are reserved, see asm-generic/hugetlb_encode.h
|
|
* for MAP_HUGETLB usage
|
|
*/
|
|
|
|
#define MCL_CURRENT 1 /* lock all current mappings */
|
|
#define MCL_FUTURE 2 /* lock all future mappings */
|
|
#define MCL_ONFAULT 4 /* lock all pages that are faulted in */
|
|
|
|
#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */
|
|
#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack marker in the shadow stack */
|
|
|
|
|
|
#endif /* __ASM_GENERIC_MMAN_H */
|