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Diffstat (limited to 'tools/include/nolibc/arch-openrisc.h')
| -rw-r--r-- | tools/include/nolibc/arch-openrisc.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/tools/include/nolibc/arch-openrisc.h b/tools/include/nolibc/arch-openrisc.h new file mode 100644 index 000000000..5ef82fd9c --- /dev/null +++ b/tools/include/nolibc/arch-openrisc.h @@ -0,0 +1,160 @@ +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ +/* + * OpenRISC specific definitions for NOLIBC + * Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net> + */ + +#ifndef _NOLIBC_ARCH_OPENRISC_H +#define _NOLIBC_ARCH_OPENRISC_H + +#include "compiler.h" +#include "crt.h" + +/* + * Syscalls for OpenRISC: + * - syscall number is passed in r11 + * - arguments are in r3, r4, r5, r6, r7, r8 + * - the system call is performed by calling l.sys 1 + * - syscall return value is in r11 + */ + +#define _NOLIBC_SYSCALL_CLOBBERLIST \ + "r12", "r13", "r15", "r17", "r19", "r21", "r23", "r25", "r27", "r29", "r31", "memory" + +#define __nolibc_syscall0(num) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : \ + : "r3", "r4", "r5", "r6", "r7", "r8", \ + _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#define __nolibc_syscall1(num, arg1) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + register long _arg1 __asm__ ("r3") = (long)(arg1); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : "r"(_arg1) \ + : "r4", "r5", "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#define __nolibc_syscall2(num, arg1, arg2) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + register long _arg1 __asm__ ("r3") = (long)(arg1); \ + register long _arg2 __asm__ ("r4") = (long)(arg2); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : "r"(_arg1), "r"(_arg2) \ + : "r5", "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#define __nolibc_syscall3(num, arg1, arg2, arg3) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + register long _arg1 __asm__ ("r3") = (long)(arg1); \ + register long _arg2 __asm__ ("r4") = (long)(arg2); \ + register long _arg3 __asm__ ("r5") = (long)(arg3); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3) \ + : "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + register long _arg1 __asm__ ("r3") = (long)(arg1); \ + register long _arg2 __asm__ ("r4") = (long)(arg2); \ + register long _arg3 __asm__ ("r5") = (long)(arg3); \ + register long _arg4 __asm__ ("r6") = (long)(arg4); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \ + : "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + register long _arg1 __asm__ ("r3") = (long)(arg1); \ + register long _arg2 __asm__ ("r4") = (long)(arg2); \ + register long _arg3 __asm__ ("r5") = (long)(arg3); \ + register long _arg4 __asm__ ("r6") = (long)(arg4); \ + register long _arg5 __asm__ ("r7") = (long)(arg5); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \ + : "r8", _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + register long _num __asm__ ("r11") = (num); \ + register long _arg1 __asm__ ("r3") = (long)(arg1); \ + register long _arg2 __asm__ ("r4") = (long)(arg2); \ + register long _arg3 __asm__ ("r5") = (long)(arg3); \ + register long _arg4 __asm__ ("r6") = (long)(arg4); \ + register long _arg5 __asm__ ("r7") = (long)(arg5); \ + register long _arg6 __asm__ ("r8") = (long)(arg6); \ + \ + __asm__ volatile ( \ + "l.sys 1\n" \ + : "+r"(_num) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \ + "r"(_arg6) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _num; \ +}) + +#ifndef NOLIBC_NO_RUNTIME +/* startup code */ +void _start_wrapper(void); +void __attribute__((weak,noreturn)) +__nolibc_entrypoint __nolibc_no_stack_protector +_start_wrapper(void) +{ + __asm__ volatile ( + ".global _start\n" /* The C function will have a prologue, */ + ".type _start, @function\n" /* corrupting "sp/r1" */ + ".weak _start\n" + "_start:\n" + + "l.jal _start_c\n" /* transfer to c runtime */ + "l.or r3,r1,r1\n" /* save stack pointer to r3, as arg1 of _start_c */ + + ".size _start, .-_start\n" + ); + __nolibc_entrypoint_epilogue(); +} +#endif /* NOLIBC_NO_RUNTIME */ + +#endif /* _NOLIBC_ARCH_OPENRISC_H */ |