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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_SCS_H
#define _ASM_SCS_H
#ifdef __ASSEMBLY__
#include <asm/asm-offsets.h>
#include <asm/sysreg.h>
#ifdef CONFIG_SHADOW_CALL_STACK
scs_sp .req x18
.macro scs_load_current
get_current_task scs_sp
ldr scs_sp, [scs_sp, #TSK_TI_SCS_SP]
.endm
.macro scs_save tsk
str scs_sp, [\tsk, #TSK_TI_SCS_SP]
.endm
#else
.macro scs_load_current
.endm
.macro scs_save tsk
.endm
#endif /* CONFIG_SHADOW_CALL_STACK */
#else
#include <linux/scs.h>
#include <asm/cpufeature.h>
#ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS
static inline void dynamic_scs_init(void)
{
extern bool __pi_dynamic_scs_is_enabled;
if (__pi_dynamic_scs_is_enabled) {
pr_info("Enabling dynamic shadow call stack\n");
static_branch_enable(&dynamic_scs_enabled);
}
}
#else
static inline void dynamic_scs_init(void) {}
#endif
enum {
EDYNSCS_INVALID_CIE_HEADER = 1,
EDYNSCS_INVALID_CIE_SDATA_SIZE = 2,
EDYNSCS_INVALID_FDE_AUGM_DATA_SIZE = 3,
EDYNSCS_INVALID_CFA_OPCODE = 4,
};
int __pi_scs_patch(const u8 eh_frame[], int size, bool skip_dry_run);
#endif /* __ASSEMBLY __ */
#endif /* _ASM_SCS_H */
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