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

#define __PPC_SCT(name, inst)                                   \
        asm(".pushsection .text, \"ax\"                         \n"     \
            ".align 5                                           \n"     \
            ".globl " STATIC_CALL_TRAMP_STR(name) "             \n"     \
            STATIC_CALL_TRAMP_STR(name) ":                      \n"     \
            inst "                                              \n"     \
            "   lis     12,2f@ha                                \n"     \
            "   lwz     12,2f@l(12)                             \n"     \
            "   mtctr   12                                      \n"     \
            "   bctr                                            \n"     \
            "1: li      3, 0                                    \n"     \
            "   blr                                             \n"     \
            "2: .long 0                                         \n"     \
            ".type " STATIC_CALL_TRAMP_STR(name) ", @function   \n"     \
            ".size " STATIC_CALL_TRAMP_STR(name) ", . - " STATIC_CALL_TRAMP_STR(name) " \n" \
            ".popsection                                        \n")

#define PPC_SCT_RET0            20              /* Offset of label 1 */
#define PPC_SCT_DATA            28              /* Offset of label 2 */

#define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func)       __PPC_SCT(name, "b " #func)
#define ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)        __PPC_SCT(name, "blr")
#define ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)        __PPC_SCT(name, "b .+20")

#define CALL_INSN_SIZE          4

#endif /* _ASM_POWERPC_STATIC_CALL_H */