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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; \
})
/* 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_ARCH_SH_H */
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