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- /* SPDX-License-Identifier: LGPL-2.1 OR MIT */
- /*
- * SuperH specific definitions for NOLIBC
- * Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
- */
- #ifndef _NOLIBC_ARCH_SH_H
- #define _NOLIBC_ARCH_SH_H
- #include "compiler.h"
- #include "crt.h"
- /*
- * Syscalls for SuperH:
- * - registers are 32bit wide
- * - syscall number is passed in r3
- * - arguments are in r4, r5, r6, r7, r0, r1, r2
- * - the system call is performed by calling trapa #31
- * - syscall return value is in r0
- */
- #define my_syscall0(num) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #define my_syscall1(num, arg1) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- register long _arg1 __asm__ ("r4") = (long)(arg1); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num), "r"(_arg1) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #define my_syscall2(num, arg1, arg2) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- register long _arg1 __asm__ ("r4") = (long)(arg1); \
- register long _arg2 __asm__ ("r5") = (long)(arg2); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num), "r"(_arg1), "r"(_arg2) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #define my_syscall3(num, arg1, arg2, arg3) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- register long _arg1 __asm__ ("r4") = (long)(arg1); \
- register long _arg2 __asm__ ("r5") = (long)(arg2); \
- register long _arg3 __asm__ ("r6") = (long)(arg3); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #define my_syscall4(num, arg1, arg2, arg3, arg4) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- register long _arg1 __asm__ ("r4") = (long)(arg1); \
- register long _arg2 __asm__ ("r5") = (long)(arg2); \
- register long _arg3 __asm__ ("r6") = (long)(arg3); \
- register long _arg4 __asm__ ("r7") = (long)(arg4); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- register long _arg1 __asm__ ("r4") = (long)(arg1); \
- register long _arg2 __asm__ ("r5") = (long)(arg2); \
- register long _arg3 __asm__ ("r6") = (long)(arg3); \
- register long _arg4 __asm__ ("r7") = (long)(arg4); \
- register long _arg5 __asm__ ("r0") = (long)(arg5); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), \
- "r"(_arg5) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
- ({ \
- register long _num __asm__ ("r3") = (num); \
- register long _ret __asm__ ("r0"); \
- register long _arg1 __asm__ ("r4") = (long)(arg1); \
- register long _arg2 __asm__ ("r5") = (long)(arg2); \
- register long _arg3 __asm__ ("r6") = (long)(arg3); \
- register long _arg4 __asm__ ("r7") = (long)(arg4); \
- register long _arg5 __asm__ ("r0") = (long)(arg5); \
- register long _arg6 __asm__ ("r1") = (long)(arg6); \
- \
- __asm__ volatile ( \
- "trapa #31" \
- : "=r"(_ret) \
- : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), \
- "r"(_arg5), "r"(_arg6) \
- : "memory", "cc" \
- ); \
- _ret; \
- })
- #ifndef NOLIBC_NO_RUNTIME
- /* startup code */
- void _start_wrapper(void);
- void __attribute__((weak,noreturn)) __nolibc_entrypoint __no_stack_protector _start_wrapper(void)
- {
- __asm__ volatile (
- ".global _start\n" /* The C function will have a prologue, */
- ".type _start, @function\n" /* corrupting "sp" */
- ".weak _start\n"
- "_start:\n"
- "mov sp, r4\n" /* save argc pointer to r4, as arg1 of _start_c */
- "bsr _start_c\n" /* transfer to c runtime */
- "nop\n" /* delay slot */
- ".size _start, .-_start\n"
- );
- __nolibc_entrypoint_epilogue();
- }
- #endif /* NOLIBC_NO_RUNTIME */
- #endif /* _NOLIBC_ARCH_SH_H */
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