diff options
Diffstat (limited to 'tools/include/nolibc/arch-loongarch.h')
| -rw-r--r-- | tools/include/nolibc/arch-loongarch.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/arch-loongarch.h new file mode 100644 index 000000000000..3f8ef8f86c0f --- /dev/null +++ b/tools/include/nolibc/arch-loongarch.h @@ -0,0 +1,162 @@ +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ +/* + * LoongArch specific definitions for NOLIBC + * Copyright (C) 2023 Loongson Technology Corporation Limited + */ + +#ifndef _NOLIBC_ARCH_LOONGARCH_H +#define _NOLIBC_ARCH_LOONGARCH_H + +#include "compiler.h" +#include "crt.h" + +/* Syscalls for LoongArch : + * - stack is 16-byte aligned + * - syscall number is passed in a7 + * - arguments are in a0, a1, a2, a3, a4, a5 + * - the system call is performed by calling "syscall 0" + * - syscall return comes in a0 + * - the arguments are cast to long and assigned into the target + * registers which are then simply passed as registers to the asm code, + * so that we don't have to experience issues with register constraints. + */ + +#define _NOLIBC_SYSCALL_CLOBBERLIST \ + "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8" + +#define my_syscall0(num) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0"); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "=r"(_arg1) \ + : "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#define my_syscall1(num, arg1) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "+r"(_arg1) \ + : "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#define my_syscall2(num, arg1, arg2) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + register long _arg2 __asm__ ("a1") = (long)(arg2); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "+r"(_arg1) \ + : "r"(_arg2), \ + "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#define my_syscall3(num, arg1, arg2, arg3) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + register long _arg2 __asm__ ("a1") = (long)(arg2); \ + register long _arg3 __asm__ ("a2") = (long)(arg3); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "+r"(_arg1) \ + : "r"(_arg2), "r"(_arg3), \ + "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#define my_syscall4(num, arg1, arg2, arg3, arg4) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + register long _arg2 __asm__ ("a1") = (long)(arg2); \ + register long _arg3 __asm__ ("a2") = (long)(arg3); \ + register long _arg4 __asm__ ("a3") = (long)(arg4); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "+r"(_arg1) \ + : "r"(_arg2), "r"(_arg3), "r"(_arg4), \ + "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + register long _arg2 __asm__ ("a1") = (long)(arg2); \ + register long _arg3 __asm__ ("a2") = (long)(arg3); \ + register long _arg4 __asm__ ("a3") = (long)(arg4); \ + register long _arg5 __asm__ ("a4") = (long)(arg5); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "+r"(_arg1) \ + : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \ + "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + register long _num __asm__ ("a7") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + register long _arg2 __asm__ ("a1") = (long)(arg2); \ + register long _arg3 __asm__ ("a2") = (long)(arg3); \ + register long _arg4 __asm__ ("a3") = (long)(arg4); \ + register long _arg5 __asm__ ("a4") = (long)(arg5); \ + register long _arg6 __asm__ ("a5") = (long)(arg6); \ + \ + __asm__ volatile ( \ + "syscall 0\n" \ + : "+r"(_arg1) \ + : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \ + "r"(_num) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg1; \ +}) + +#if __loongarch_grlen == 32 +#define LONG_BSTRINS "bstrins.w" +#else /* __loongarch_grlen == 64 */ +#define LONG_BSTRINS "bstrins.d" +#endif + +/* startup code */ +void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void) +{ + __asm__ volatile ( + "move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */ + LONG_BSTRINS " $sp, $zero, 3, 0\n" /* $sp must be 16-byte aligned */ + "bl _start_c\n" /* transfer to c runtime */ + ); + __builtin_unreachable(); +} + +#endif /* _NOLIBC_ARCH_LOONGARCH_H */ |