/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_SCS_H
#define _ASM_SCS_H

#ifdef __ASSEMBLER__

#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 /* __ASSEMBLER__ */

#endif /* _ASM_SCS_H */