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97d6655082
Add support for OpenRISC / or1k to nolibc. _start() uses the same wrapper construct as in arch-sh.h. libgcc is necessary as OpenRISC is missing 64-bit multiplication. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Stafford Horne <shorne@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-openrisc-v2-1-8d7d7a2f3fec@weissschuh.net
161 lines
7.9 KiB
C
161 lines
7.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* OpenRISC specific definitions for NOLIBC
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* Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
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*/
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#ifndef _NOLIBC_ARCH_OPENRISC_H
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#define _NOLIBC_ARCH_OPENRISC_H
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#include "compiler.h"
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#include "crt.h"
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/*
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* Syscalls for OpenRISC:
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* - syscall number is passed in r11
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* - arguments are in r3, r4, r5, r6, r7, r8
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* - the system call is performed by calling l.sys 1
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* - syscall return value is in r11
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*/
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#define _NOLIBC_SYSCALL_CLOBBERLIST \
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"r12", "r13", "r15", "r17", "r19", "r21", "r23", "r25", "r27", "r29", "r31", "memory"
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#define __nolibc_syscall0(num) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: \
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: "r3", "r4", "r5", "r6", "r7", "r8", \
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_NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define __nolibc_syscall1(num, arg1) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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register long _arg1 __asm__ ("r3") = (long)(arg1); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: "r"(_arg1) \
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: "r4", "r5", "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define __nolibc_syscall2(num, arg1, arg2) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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register long _arg1 __asm__ ("r3") = (long)(arg1); \
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register long _arg2 __asm__ ("r4") = (long)(arg2); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2) \
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: "r5", "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define __nolibc_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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register long _arg1 __asm__ ("r3") = (long)(arg1); \
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register long _arg2 __asm__ ("r4") = (long)(arg2); \
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register long _arg3 __asm__ ("r5") = (long)(arg3); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3) \
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: "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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register long _arg1 __asm__ ("r3") = (long)(arg1); \
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register long _arg2 __asm__ ("r4") = (long)(arg2); \
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register long _arg3 __asm__ ("r5") = (long)(arg3); \
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register long _arg4 __asm__ ("r6") = (long)(arg4); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
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: "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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register long _arg1 __asm__ ("r3") = (long)(arg1); \
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register long _arg2 __asm__ ("r4") = (long)(arg2); \
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register long _arg3 __asm__ ("r5") = (long)(arg3); \
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register long _arg4 __asm__ ("r6") = (long)(arg4); \
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register long _arg5 __asm__ ("r7") = (long)(arg5); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
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: "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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register long _num __asm__ ("r11") = (num); \
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register long _arg1 __asm__ ("r3") = (long)(arg1); \
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register long _arg2 __asm__ ("r4") = (long)(arg2); \
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register long _arg3 __asm__ ("r5") = (long)(arg3); \
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register long _arg4 __asm__ ("r6") = (long)(arg4); \
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register long _arg5 __asm__ ("r7") = (long)(arg5); \
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register long _arg6 __asm__ ("r8") = (long)(arg6); \
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\
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__asm__ volatile ( \
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"l.sys 1\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
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"r"(_arg6) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#ifndef NOLIBC_NO_RUNTIME
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/* startup code */
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void _start_wrapper(void);
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void __attribute__((weak,noreturn))
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__nolibc_entrypoint __nolibc_no_stack_protector
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_start_wrapper(void)
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{
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__asm__ volatile (
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".global _start\n" /* The C function will have a prologue, */
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".type _start, @function\n" /* corrupting "sp/r1" */
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".weak _start\n"
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"_start:\n"
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"l.jal _start_c\n" /* transfer to c runtime */
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"l.or r3,r1,r1\n" /* save stack pointer to r3, as arg1 of _start_c */
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".size _start, .-_start\n"
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);
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__nolibc_entrypoint_epilogue();
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}
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#endif /* NOLIBC_NO_RUNTIME */
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#endif /* _NOLIBC_ARCH_OPENRISC_H */
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