2023-03-04 22:29:53 +08:00
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* LoongArch specific definitions for NOLIBC
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* Copyright (C) 2023 Loongson Technology Corporation Limited
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*/
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#ifndef _NOLIBC_ARCH_LOONGARCH_H
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#define _NOLIBC_ARCH_LOONGARCH_H
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2023-05-21 17:36:34 +08:00
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#include "compiler.h"
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2023-07-16 02:30:02 +08:00
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#include "crt.h"
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2023-05-21 17:36:34 +08:00
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2023-03-04 22:29:53 +08:00
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/* Syscalls for LoongArch :
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* - stack is 16-byte aligned
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* - syscall number is passed in a7
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* - arguments are in a0, a1, a2, a3, a4, a5
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* - the system call is performed by calling "syscall 0"
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* - syscall return comes in a0
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* - the arguments are cast to long and assigned into the target
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* registers which are then simply passed as registers to the asm code,
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* so that we don't have to experience issues with register constraints.
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*
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* On LoongArch, select() is not implemented so we have to use pselect6().
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*/
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#define __ARCH_WANT_SYS_PSELECT6
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#define _NOLIBC_SYSCALL_CLOBBERLIST \
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"memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8"
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#define my_syscall0(num) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0"); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "=r"(_arg1) \
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: "r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#define my_syscall1(num, arg1) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0") = (long)(arg1); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "+r"(_arg1) \
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: "r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#define my_syscall2(num, arg1, arg2) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0") = (long)(arg1); \
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register long _arg2 __asm__ ("a1") = (long)(arg2); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "+r"(_arg1) \
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: "r"(_arg2), \
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"r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#define my_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0") = (long)(arg1); \
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register long _arg2 __asm__ ("a1") = (long)(arg2); \
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register long _arg3 __asm__ ("a2") = (long)(arg3); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), \
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"r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#define my_syscall4(num, arg1, arg2, arg3, arg4) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0") = (long)(arg1); \
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register long _arg2 __asm__ ("a1") = (long)(arg2); \
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register long _arg3 __asm__ ("a2") = (long)(arg3); \
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register long _arg4 __asm__ ("a3") = (long)(arg4); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_arg4), \
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"r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0") = (long)(arg1); \
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register long _arg2 __asm__ ("a1") = (long)(arg2); \
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register long _arg3 __asm__ ("a2") = (long)(arg3); \
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register long _arg4 __asm__ ("a3") = (long)(arg4); \
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register long _arg5 __asm__ ("a4") = (long)(arg5); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
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"r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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register long _num __asm__ ("a7") = (num); \
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register long _arg1 __asm__ ("a0") = (long)(arg1); \
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register long _arg2 __asm__ ("a1") = (long)(arg2); \
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register long _arg3 __asm__ ("a2") = (long)(arg3); \
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register long _arg4 __asm__ ("a3") = (long)(arg4); \
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register long _arg5 __asm__ ("a4") = (long)(arg5); \
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register long _arg6 __asm__ ("a5") = (long)(arg6); \
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\
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__asm__ volatile ( \
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"syscall 0\n" \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
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"r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg1; \
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})
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#if __loongarch_grlen == 32
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#define LONG_BSTRINS "bstrins.w"
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#else /* __loongarch_grlen == 64 */
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#define LONG_BSTRINS "bstrins.d"
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#endif
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/* startup code */
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void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
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{
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__asm__ volatile (
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"move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
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LONG_BSTRINS " $sp, $zero, 3, 0\n" /* $sp must be 16-byte aligned */
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"bl _start_c\n" /* transfer to c runtime */
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);
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__builtin_unreachable();
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}
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2023-04-07 05:54:49 +08:00
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#endif /* _NOLIBC_ARCH_LOONGARCH_H */
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