LoongArch: Linux Syscall Interface

8 files changed, 947 insertions, 0 deletions

diff --git a/sysdeps/loongarch/abort-instr.h b/sysdeps/loongarch/abort-instr.h
new file mode 100644
index 0000000..46d3ad0
--- /dev/null
+++ b/sysdeps/loongarch/abort-instr.h
@@ -0,0 +1,2 @@
+/* An instruction which should crash any program is a breakpoint.  */
+#define ABORT_INSTRUCTION asm ("break 0")
diff --git a/sysdeps/loongarch/hp-timing.h b/sysdeps/loongarch/hp-timing.h
new file mode 100644
index 0000000..af1da81
--- /dev/null
+++ b/sysdeps/loongarch/hp-timing.h
@@ -0,0 +1,42 @@
+/* High precision, low overhead timing functions.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _HP_TIMING_H
+#define _HP_TIMING_H 1
+
+/* We always assume having the timestamp register.  */
+#define HP_TIMING_AVAIL (1)
+#define HP_SMALL_TIMING_AVAIL (1)
+
+/* We indeed have inlined functions.  */
+#define HP_TIMING_INLINE (1)
+
+/* We use 64bit values for the times.  */
+typedef unsigned long long int hp_timing_t;
+
+/* Read the stable counter.  */
+#define HP_TIMING_NOW(Var) \
+  ({ \
+    unsigned long long int _count; \
+    asm volatile ("rdtime.d\t%0,$r0" : "=r" (_count)); \
+    (Var) = _count; \
+  })
+
+#include <hp-timing-common.h>
+
+#endif /* hp-timing.h */
diff --git a/sysdeps/unix/sysv/linux/loongarch/arch-syscall.h b/sysdeps/unix/sysv/linux/loongarch/arch-syscall.h
new file mode 100644
index 0000000..6bb3c8a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/arch-syscall.h
@@ -0,0 +1,301 @@
+/* AUTOGENERATED by update-syscall-lists.py.  */
+#define __NR_accept 202
+#define __NR_accept4 242
+#define __NR_acct 89
+#define __NR_add_key 217
+#define __NR_adjtimex 171
+#define __NR_bind 200
+#define __NR_bpf 280
+#define __NR_brk 214
+#define __NR_capget 90
+#define __NR_capset 91
+#define __NR_chdir 49
+#define __NR_chroot 51
+#define __NR_clock_adjtime 266
+#define __NR_clock_getres 114
+#define __NR_clock_gettime 113
+#define __NR_clock_nanosleep 115
+#define __NR_clock_settime 112
+#define __NR_clone 220
+#define __NR_clone3 435
+#define __NR_close 57
+#define __NR_close_range 436
+#define __NR_connect 203
+#define __NR_copy_file_range 285
+#define __NR_delete_module 106
+#define __NR_dup 23
+#define __NR_dup3 24
+#define __NR_epoll_create1 20
+#define __NR_epoll_ctl 21
+#define __NR_epoll_pwait 22
+#define __NR_epoll_pwait2 441
+#define __NR_eventfd2 19
+#define __NR_execve 221
+#define __NR_execveat 281
+#define __NR_exit 93
+#define __NR_exit_group 94
+#define __NR_faccessat 48
+#define __NR_faccessat2 439
+#define __NR_fadvise64 223
+#define __NR_fallocate 47
+#define __NR_fanotify_init 262
+#define __NR_fanotify_mark 263
+#define __NR_fchdir 50
+#define __NR_fchmod 52
+#define __NR_fchmodat 53
+#define __NR_fchown 55
+#define __NR_fchownat 54
+#define __NR_fcntl 25
+#define __NR_fdatasync 83
+#define __NR_fgetxattr 10
+#define __NR_finit_module 273
+#define __NR_flistxattr 13
+#define __NR_flock 32
+#define __NR_fremovexattr 16
+#define __NR_fsconfig 431
+#define __NR_fsetxattr 7
+#define __NR_fsmount 432
+#define __NR_fsopen 430
+#define __NR_fspick 433
+#define __NR_fstatfs 44
+#define __NR_fsync 82
+#define __NR_ftruncate 46
+#define __NR_futex 98
+#define __NR_futex_waitv 449
+#define __NR_get_mempolicy 236
+#define __NR_get_robust_list 100
+#define __NR_getcpu 168
+#define __NR_getcwd 17
+#define __NR_getdents64 61
+#define __NR_getegid 177
+#define __NR_geteuid 175
+#define __NR_getgid 176
+#define __NR_getgroups 158
+#define __NR_getitimer 102
+#define __NR_getpeername 205
+#define __NR_getpgid 155
+#define __NR_getpid 172
+#define __NR_getppid 173
+#define __NR_getpriority 141
+#define __NR_getrandom 278
+#define __NR_getresgid 150
+#define __NR_getresuid 148
+#define __NR_getrusage 165
+#define __NR_getsid 156
+#define __NR_getsockname 204
+#define __NR_getsockopt 209
+#define __NR_gettid 178
+#define __NR_gettimeofday 169
+#define __NR_getuid 174
+#define __NR_getxattr 8
+#define __NR_init_module 105
+#define __NR_inotify_add_watch 27
+#define __NR_inotify_init1 26
+#define __NR_inotify_rm_watch 28
+#define __NR_io_cancel 3
+#define __NR_io_destroy 1
+#define __NR_io_getevents 4
+#define __NR_io_pgetevents 292
+#define __NR_io_setup 0
+#define __NR_io_submit 2
+#define __NR_io_uring_enter 426
+#define __NR_io_uring_register 427
+#define __NR_io_uring_setup 425
+#define __NR_ioctl 29
+#define __NR_ioprio_get 31
+#define __NR_ioprio_set 30
+#define __NR_kcmp 272
+#define __NR_kexec_file_load 294
+#define __NR_kexec_load 104
+#define __NR_keyctl 219
+#define __NR_kill 129
+#define __NR_landlock_add_rule 445
+#define __NR_landlock_create_ruleset 444
+#define __NR_landlock_restrict_self 446
+#define __NR_lgetxattr 9
+#define __NR_linkat 37
+#define __NR_listen 201
+#define __NR_listxattr 11
+#define __NR_llistxattr 12
+#define __NR_lookup_dcookie 18
+#define __NR_lremovexattr 15
+#define __NR_lseek 62
+#define __NR_lsetxattr 6
+#define __NR_madvise 233
+#define __NR_mbind 235
+#define __NR_membarrier 283
+#define __NR_memfd_create 279
+#define __NR_migrate_pages 238
+#define __NR_mincore 232
+#define __NR_mkdirat 34
+#define __NR_mknodat 33
+#define __NR_mlock 228
+#define __NR_mlock2 284
+#define __NR_mlockall 230
+#define __NR_mmap 222
+#define __NR_mount 40
+#define __NR_mount_setattr 442
+#define __NR_move_mount 429
+#define __NR_move_pages 239
+#define __NR_mprotect 226
+#define __NR_mq_getsetattr 185
+#define __NR_mq_notify 184
+#define __NR_mq_open 180
+#define __NR_mq_timedreceive 183
+#define __NR_mq_timedsend 182
+#define __NR_mq_unlink 181
+#define __NR_mremap 216
+#define __NR_msgctl 187
+#define __NR_msgget 186
+#define __NR_msgrcv 188
+#define __NR_msgsnd 189
+#define __NR_msync 227
+#define __NR_munlock 229
+#define __NR_munlockall 231
+#define __NR_munmap 215
+#define __NR_name_to_handle_at 264
+#define __NR_nanosleep 101
+#define __NR_nfsservctl 42
+#define __NR_open_by_handle_at 265
+#define __NR_open_tree 428
+#define __NR_openat 56
+#define __NR_openat2 437
+#define __NR_perf_event_open 241
+#define __NR_personality 92
+#define __NR_pidfd_getfd 438
+#define __NR_pidfd_open 434
+#define __NR_pidfd_send_signal 424
+#define __NR_pipe2 59
+#define __NR_pivot_root 41
+#define __NR_pkey_alloc 289
+#define __NR_pkey_free 290
+#define __NR_pkey_mprotect 288
+#define __NR_ppoll 73
+#define __NR_prctl 167
+#define __NR_pread64 67
+#define __NR_preadv 69
+#define __NR_preadv2 286
+#define __NR_prlimit64 261
+#define __NR_process_madvise 440
+#define __NR_process_mrelease 448
+#define __NR_process_vm_readv 270
+#define __NR_process_vm_writev 271
+#define __NR_pselect6 72
+#define __NR_ptrace 117
+#define __NR_pwrite64 68
+#define __NR_pwritev 70
+#define __NR_pwritev2 287
+#define __NR_quotactl 60
+#define __NR_quotactl_fd 443
+#define __NR_read 63
+#define __NR_readahead 213
+#define __NR_readlinkat 78
+#define __NR_readv 65
+#define __NR_reboot 142
+#define __NR_recvfrom 207
+#define __NR_recvmmsg 243
+#define __NR_recvmsg 212
+#define __NR_remap_file_pages 234
+#define __NR_removexattr 14
+#define __NR_renameat2 276
+#define __NR_request_key 218
+#define __NR_restart_syscall 128
+#define __NR_rseq 293
+#define __NR_rt_sigaction 134
+#define __NR_rt_sigpending 136
+#define __NR_rt_sigprocmask 135
+#define __NR_rt_sigqueueinfo 138
+#define __NR_rt_sigreturn 139
+#define __NR_rt_sigsuspend 133
+#define __NR_rt_sigtimedwait 137
+#define __NR_rt_tgsigqueueinfo 240
+#define __NR_sched_get_priority_max 125
+#define __NR_sched_get_priority_min 126
+#define __NR_sched_getaffinity 123
+#define __NR_sched_getattr 275
+#define __NR_sched_getparam 121
+#define __NR_sched_getscheduler 120
+#define __NR_sched_rr_get_interval 127
+#define __NR_sched_setaffinity 122
+#define __NR_sched_setattr 274
+#define __NR_sched_setparam 118
+#define __NR_sched_setscheduler 119
+#define __NR_sched_yield 124
+#define __NR_seccomp 277
+#define __NR_semctl 191
+#define __NR_semget 190
+#define __NR_semop 193
+#define __NR_semtimedop 192
+#define __NR_sendfile 71
+#define __NR_sendmmsg 269
+#define __NR_sendmsg 211
+#define __NR_sendto 206
+#define __NR_set_mempolicy 237
+#define __NR_set_mempolicy_home_node 450
+#define __NR_set_robust_list 99
+#define __NR_set_tid_address 96
+#define __NR_setdomainname 162
+#define __NR_setfsgid 152
+#define __NR_setfsuid 151
+#define __NR_setgid 144
+#define __NR_setgroups 159
+#define __NR_sethostname 161
+#define __NR_setitimer 103
+#define __NR_setns 268
+#define __NR_setpgid 154
+#define __NR_setpriority 140
+#define __NR_setregid 143
+#define __NR_setresgid 149
+#define __NR_setresuid 147
+#define __NR_setreuid 145
+#define __NR_setsid 157
+#define __NR_setsockopt 208
+#define __NR_settimeofday 170
+#define __NR_setuid 146
+#define __NR_setxattr 5
+#define __NR_shmat 196
+#define __NR_shmctl 195
+#define __NR_shmdt 197
+#define __NR_shmget 194
+#define __NR_shutdown 210
+#define __NR_sigaltstack 132
+#define __NR_signalfd4 74
+#define __NR_socket 198
+#define __NR_socketpair 199
+#define __NR_splice 76
+#define __NR_statfs 43
+#define __NR_statx 291
+#define __NR_swapoff 225
+#define __NR_swapon 224
+#define __NR_symlinkat 36
+#define __NR_sync 81
+#define __NR_sync_file_range 84
+#define __NR_syncfs 267
+#define __NR_sysinfo 179
+#define __NR_syslog 116
+#define __NR_tee 77
+#define __NR_tgkill 131
+#define __NR_timer_create 107
+#define __NR_timer_delete 111
+#define __NR_timer_getoverrun 109
+#define __NR_timer_gettime 108
+#define __NR_timer_settime 110
+#define __NR_timerfd_create 85
+#define __NR_timerfd_gettime 87
+#define __NR_timerfd_settime 86
+#define __NR_times 153
+#define __NR_tkill 130
+#define __NR_truncate 45
+#define __NR_umask 166
+#define __NR_umount2 39
+#define __NR_uname 160
+#define __NR_unlinkat 35
+#define __NR_unshare 97
+#define __NR_userfaultfd 282
+#define __NR_utimensat 88
+#define __NR_vhangup 58
+#define __NR_vmsplice 75
+#define __NR_wait4 260
+#define __NR_waitid 95
+#define __NR_write 64
+#define __NR_writev 66
diff --git a/sysdeps/unix/sysv/linux/loongarch/clone.S b/sysdeps/unix/sysv/linux/loongarch/clone.S
new file mode 100644
index 0000000..c73245b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/clone.S
@@ -0,0 +1,96 @@
+/* The clone syscall wrapper.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <sys/asm.h>
+#include <sysdep.h>
+#define _ERRNO_H  1
+#include <bits/errno.h>
+#include <tls.h>
+#include "tcb-offsets.h"
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
+   void *parent_tidptr, void *tls, void *child_tidptr) */
+
+ENTRY (__clone)
+
+	/* Align stack to 16.  */
+	BSTRINS		a1, zero, 3, 0
+
+	/* Sanity check arguments.  */
+	beqz		a0, L (invalid) /* No NULL function pointers.  */
+	beqz		a1, L (invalid) /* No NULL stack pointers.  */
+
+	ADDI 		a1, a1, -16 /* Reserve argument save space.  */
+	REG_S		a0, a1, 0   /* Save function pointer.  */
+	REG_S		a3, a1, SZREG   /* Save argument pointer.  */
+
+	/* The syscall expects the args to be in different slots.  */
+	or		a0, a2, zero
+	or		a2, a4, zero
+	or		a3, a6, zero
+	or		a4, a5, zero
+
+	/* Do the system call.  */
+	LI		a7,__NR_clone
+	syscall		0
+
+	blt		a0, zero ,L (error)
+	beqz		a0,L (thread_start)
+
+	/* Successful return from the parent.  */
+	ret
+
+L (invalid):
+	LI		a0, -EINVAL
+
+	/* Something bad happened -- no child created.  */
+L (error):
+	b		__syscall_error
+
+END (__clone)
+
+/* Load up the arguments to the function.  Put this block of code in
+   its own function so that we can terminate the stack trace with our
+   debug info.  */
+ENTRY (__thread_start)
+L (thread_start):
+
+/* Terminate call stack by noting ra is undefined.  Use a dummy
+   .cfi_label to force starting the FDE.  */
+	.cfi_label .Ldummy
+	cfi_undefined (1)
+
+	/* Restore the arg for user's function.  */
+	REG_L		a1, sp, 0   /* Function pointer.  */
+	REG_L		a0, sp, SZREG   /* Argument pointer.  */
+
+	/* Call the user's function.  */
+	jirl		ra, a1, 0
+
+	/* Call exit with the function's return value.  */
+	LI		a7, __NR_exit
+	syscall		0
+
+	END (__thread_start)
+
+libc_hidden_def (__clone)
+weak_alias (__clone, clone)
diff --git a/sysdeps/unix/sysv/linux/loongarch/clone3.S b/sysdeps/unix/sysv/linux/loongarch/clone3.S
new file mode 100644
index 0000000..38be4c8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/clone3.S
@@ -0,0 +1,83 @@
+/* The clone3 syscall wrapper.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* clone3() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <sys/asm.h>
+#include <sysdep.h>
+#define _ERRNO_H  1
+#include <bits/errno.h>
+#include <tls.h>
+#include "tcb-offsets.h"
+
+/* int clone3(struct clone_args *cl_args, size_t size,
+   int (*func)(void *arg), void *arg); */
+
+ENTRY (__clone3)
+
+	/* Sanity check arguments.  */
+	beqz		a0, L (invalid)	/* No NULL cl_args pointer.  */
+	beqz		a2, L (invalid)	/* No NULL function pointer.  */
+
+	/* Do the system call.  */
+	LI		a7, __NR_clone3
+	syscall		0
+
+	blt		a0, zero ,L (error)
+	beqz		a0, L (thread_start3)
+
+	/* Successful return from the parent.  */
+	ret
+
+L (invalid):
+	LI		a0, -EINVAL
+
+	/* Something bad happened -- no child created.  */
+L (error):
+	b		__syscall_error
+
+END (__clone3)
+
+/* Load up the arguments to the function.  Put this block of code in
+   its own function so that we can terminate the stack trace with our
+   debug info.  */
+ENTRY (__thread_start3)
+L (thread_start3):
+
+/* Terminate call stack by noting ra is undefined.  Use a dummy
+   .cfi_label to force starting the FDE.  */
+	.cfi_label .Ldummy
+	cfi_undefined (1)
+
+	/* Align stack to 16.  */
+	BSTRINS		sp, zero, 3, 0
+
+	/* Set up arguments for the function call.  */
+	move		a0, a3		/* Argument.  */
+	jirl		ra, a2, 0	/* Call function.  */
+
+	/* Call exit with the function's return value.  */
+	LI		a7, __NR_exit
+	syscall		0
+
+	END (__thread_start3)
+
+libc_hidden_def (__clone3)
+weak_alias (__clone3, clone3)
diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.S b/sysdeps/unix/sysv/linux/loongarch/sysdep.S
new file mode 100644
index 0000000..a4db2a9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.S
@@ -0,0 +1,53 @@
+/* syscall error handlers
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#if IS_IN (libc)
+# define errno __libc_errno
+#endif
+
+ENTRY (__syscall_error)
+/* Fall through to __syscall_set_errno */
+END (__syscall_error)
+
+/* Non-standard calling convention: argument in a0, return address in t0,
+   and clobber only t1.
+ */
+ENTRY (__syscall_set_errno)
+
+/* We got here because a0 < 0, but only codes in the range [-4095, -1]
+   represent errors.  Otherwise, just return the result normally.
+ */
+	li.d		t1, -4096
+	bgeu		t1, a0, L (out)
+	sub.w		a0, zero, a0
+#if RTLD_PRIVATE_ERRNO
+	la		t1, rtld_errno
+#elif defined(__PIC__)
+	la.tls.ie	t1, errno
+	add.d		t1, tp, t1
+#else
+	la.tls.le	t1, errno
+	add.d		t1, tp, t1
+#endif
+	st.w		a0, t1, 0
+	li.d		a0, -1
+L (out):
+	ret
+END (__syscall_set_errno)
diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.h b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
new file mode 100644
index 0000000..c586df8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
@@ -0,0 +1,320 @@
+/* Assembly macros for LoongArch.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _LINUX_LOONGARCH_SYSDEP_H
+#define _LINUX_LOONGARCH_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
+#include <tls.h>
+
+#ifdef __ASSEMBLER__
+
+#include <sys/asm.h>
+#define ret jirl zero, ra, 0
+#define L(label) .L##label
+
+/* Performs a system call, handling errors by setting errno.  Linux indicates
+   errors by setting a0 to a value between -1 and -4095.  */
+#undef PSEUDO
+#define PSEUDO(name, syscall_name, args) \
+  ENTRY (name); \
+  li.d a7, SYS_ify (syscall_name); \
+  syscall 0; \
+  li.d a7, -4096; \
+  bltu a7, a0, .Lsyscall_error##name;
+
+#undef PSEUDO_END
+#define PSEUDO_END(sym) \
+  SYSCALL_ERROR_HANDLER (sym); \
+  ret; \
+  END (sym);
+
+#if !IS_IN(libc)
+#if RTLD_PRIVATE_ERRNO
+
+#define SYSCALL_ERROR_HANDLER(name) \
+  .Lsyscall_error##name : la t0, rtld_errno; \
+  sub.w a0, zero, a0; \
+  st.w a0, t0, 0; \
+  li.d a0, -1;
+
+#else
+
+#define SYSCALL_ERROR_HANDLER(name) \
+  .Lsyscall_error##name : la.tls.ie t0, errno; \
+  add.d t0, tp, t0; \
+  sub.w a0, zero, a0; \
+  st.w a0, t0, 0; \
+  li.d a0, -1;
+
+#endif
+#else
+
+#define SYSCALL_ERROR_HANDLER(name) .Lsyscall_error##name : b __syscall_error;
+
+#endif
+
+/* Performs a system call, not setting errno.  */
+#undef PSEUDO_NEORRNO
+#define PSEUDO_NOERRNO(name, syscall_name, args) \
+  ENTRY (name); \
+  li.d a7, SYS_ify (syscall_name); \
+  syscall 0;
+
+#undef PSEUDO_END_NOERRNO
+#define PSEUDO_END_NOERRNO(name) END (name);
+
+#undef ret_NOERRNO
+#define ret_NOERRNO ret
+
+/* Perfroms a system call, returning the error code.  */
+#undef PSEUDO_ERRVAL
+#define PSEUDO_ERRVAL(name, syscall_name, args) \
+  PSEUDO_NOERRNO (name, syscall_name, args); \
+  slli.d a0, a0, 32; \
+  srai.d a0, a0, 32; /* sign_ext */ \
+  sub.d a0, zero, a0;
+
+#undef PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(name) END (name);
+
+#undef ret_ERRVAL
+#define ret_ERRVAL ret
+
+#endif /* __ASSEMBLER__ */
+
+/* In order to get __set_errno() definition in INLINE_SYSCALL.  */
+#ifndef __ASSEMBLER__
+#include <errno.h>
+#endif
+
+#include <sysdeps/unix/sysdep.h>
+
+#undef SYS_ify
+#define SYS_ify(syscall_name) __NR_##syscall_name
+
+#ifndef __ASSEMBLER__
+
+#define VDSO_NAME "LINUX_2.6"
+#define VDSO_HASH 61765110
+
+/* List of system calls which are supported as vsyscalls.  */
+#define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
+#define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime"
+#define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
+
+#define HAVE_CLONE3_WRAPPER 1
+
+#define INTERNAL_SYSCALL(name, nr, args...) \
+  internal_syscall##nr (SYS_ify (name), args)
+
+#define INTERNAL_SYSCALL_NCS(number, nr, args...) \
+  internal_syscall##nr (number, args)
+
+#define internal_syscall0(number, dummy...) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0"); \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "=r"(__a0) \
+		       : "r"(__a7) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall1(number, arg0) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall2(number, arg0, arg1) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall3(number, arg0, arg1, arg2) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall4(number, arg0, arg1, arg2, arg3) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      long int _arg3 = (long int) (arg3); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall5(number, arg0, arg1, arg2, arg3, arg4) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      long int _arg3 = (long int) (arg3); \
+      long int _arg4 = (long int) (arg4); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      register long int __a4 asm ("$a4") = _arg4; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), \
+			 "r"(__a3), "r"(__a4) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall6(number, arg0, arg1, arg2, arg3, arg4, arg5) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      long int _arg3 = (long int) (arg3); \
+      long int _arg4 = (long int) (arg4); \
+      long int _arg5 = (long int) (arg5); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      register long int __a4 asm ("$a4") = _arg4; \
+      register long int __a5 asm ("$a5") = _arg5; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3), \
+			 "r"(__a4), "r"(__a5) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall7(number, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      long int _arg3 = (long int) (arg3); \
+      long int _arg4 = (long int) (arg4); \
+      long int _arg5 = (long int) (arg5); \
+      long int _arg6 = (long int) (arg6); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      register long int __a4 asm ("$a4") = _arg4; \
+      register long int __a5 asm ("$a5") = _arg5; \
+      register long int __a6 asm ("$a6") = _arg6; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3), \
+			 "r"(__a4), "r"(__a5), "r"(__a6) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define __SYSCALL_CLOBBERS \
+  "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "memory"
+
+extern long int __syscall_error (long int neg_errno);
+
+#endif /* ! __ASSEMBLER__ */
+
+/* Pointer mangling is not supported.  */
+#define PTR_MANGLE(var) (void) (var)
+#define PTR_DEMANGLE(var) (void) (var)
+
+#endif /* linux/loongarch/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/loongarch/vfork.S b/sysdeps/unix/sysv/linux/loongarch/vfork.S
new file mode 100644
index 0000000..fcc84e3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/vfork.S
@@ -0,0 +1,50 @@
+/* vfork for Linux.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+#define _ERRNO_H  1
+#include <bits/errno.h>
+
+/* Clone the calling process, but without copying the whole address space.
+   The calling process is suspended until the new process exits or is
+   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
+   and the process ID of the new process to the old process.  */
+
+ENTRY (__vfork)
+
+	li.d	a0, 0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
+	add.d   a1, zero, sp
+
+	/* Do the system call.  */
+	li.d	a7, __NR_clone
+	syscall	0
+
+	blt	a0, zero ,L (error)
+
+	ret
+
+L (error):
+	b	__syscall_error
+
+END (__vfork)
+
+libc_hidden_def (__vfork)
+
+weak_alias (__vfork, vfork)
+strong_alias (__vfork, __libc_vfork)