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204 lines
9.7 KiB
204 lines
9.7 KiB
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ |
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/* |
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* RISCV (32 and 64) specific definitions for NOLIBC |
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* Copyright (C) 2017-2022 Willy Tarreau <[email protected]> |
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*/ |
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#ifndef _NOLIBC_ARCH_RISCV_H |
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#define _NOLIBC_ARCH_RISCV_H |
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/* O_* macros for fcntl/open are architecture-specific */ |
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#define O_RDONLY 0 |
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#define O_WRONLY 1 |
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#define O_RDWR 2 |
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#define O_CREAT 0x100 |
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#define O_EXCL 0x200 |
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#define O_NOCTTY 0x400 |
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#define O_TRUNC 0x1000 |
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#define O_APPEND 0x2000 |
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#define O_NONBLOCK 0x4000 |
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#define O_DIRECTORY 0x200000 |
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struct sys_stat_struct { |
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unsigned long st_dev; /* Device. */ |
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unsigned long st_ino; /* File serial number. */ |
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unsigned int st_mode; /* File mode. */ |
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unsigned int st_nlink; /* Link count. */ |
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unsigned int st_uid; /* User ID of the file's owner. */ |
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unsigned int st_gid; /* Group ID of the file's group. */ |
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unsigned long st_rdev; /* Device number, if device. */ |
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unsigned long __pad1; |
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long st_size; /* Size of file, in bytes. */ |
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int st_blksize; /* Optimal block size for I/O. */ |
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int __pad2; |
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long st_blocks; /* Number 512-byte blocks allocated. */ |
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long st_atime; /* Time of last access. */ |
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unsigned long st_atime_nsec; |
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long st_mtime; /* Time of last modification. */ |
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unsigned long st_mtime_nsec; |
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long st_ctime; /* Time of last status change. */ |
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unsigned long st_ctime_nsec; |
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unsigned int __unused4; |
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unsigned int __unused5; |
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}; |
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#if __riscv_xlen == 64 |
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#define PTRLOG "3" |
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#define SZREG "8" |
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#elif __riscv_xlen == 32 |
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#define PTRLOG "2" |
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#define SZREG "4" |
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#endif |
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/* Syscalls for RISCV : |
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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 ecall |
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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 riscv, 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 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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"ecall\n\t" \ |
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: "=r"(_arg1) \ |
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: "r"(_num) \ |
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: "memory", "cc" \ |
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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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"ecall\n" \ |
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: "+r"(_arg1) \ |
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: "r"(_num) \ |
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: "memory", "cc" \ |
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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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"ecall\n" \ |
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: "+r"(_arg1) \ |
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: "r"(_arg2), \ |
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"r"(_num) \ |
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: "memory", "cc" \ |
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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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"ecall\n\t" \ |
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: "+r"(_arg1) \ |
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: "r"(_arg2), "r"(_arg3), \ |
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"r"(_num) \ |
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: "memory", "cc" \ |
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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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"ecall\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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: "memory", "cc" \ |
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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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"ecall\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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: "memory", "cc" \ |
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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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"ecall\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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: "memory", "cc" \ |
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); \ |
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_arg1; \ |
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}) |
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/* startup code */ |
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__asm__ (".section .text\n" |
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".weak _start\n" |
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"_start:\n" |
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".option push\n" |
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".option norelax\n" |
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"lla gp, __global_pointer$\n" |
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".option pop\n" |
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"lw a0, 0(sp)\n" // argc (a0) was in the stack |
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"add a1, sp, "SZREG"\n" // argv (a1) = sp |
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"slli a2, a0, "PTRLOG"\n" // envp (a2) = SZREG*argc ... |
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"add a2, a2, "SZREG"\n" // + SZREG (skip null) |
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"add a2,a2,a1\n" // + argv |
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"andi sp,a1,-16\n" // sp must be 16-byte aligned |
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"call main\n" // main() returns the status code, we'll exit with it. |
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"li a7, 93\n" // NR_exit == 93 |
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"ecall\n" |
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""); |
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#endif // _NOLIBC_ARCH_RISCV_H
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