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From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: Vineet Gupta <Vineet.Gupta1@synopsys.com>, libc-alpha@sourceware.org
Cc: linux-snps-arc@lists.infradead.org
Subject: Re: [PATCH v6 07/13] ARC: Linux Syscall Interface
Date: Fri, 29 May 2020 13:49:44 -0300
Message-ID: <248259c7-8263-805d-56cd-9db397eb9c04@linaro.org> (raw)
In-Reply-To: <20200423014126.10417-8-vgupta@synopsys.com>



On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote:
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

As prior patches we do not use DCO, but rather copyright assignment.

Some comments below.

> ---
>  sysdeps/unix/sysv/linux/arc/arch-syscall.h    | 303 ++++++++++++++++++
>  sysdeps/unix/sysv/linux/arc/bits/timesize.h   |  21 ++
>  sysdeps/unix/sysv/linux/arc/clone.S           |  98 ++++++
>  .../unix/sysv/linux/arc/fixup-asm-unistd.h    |  41 +++
>  sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h  |   6 +
>  sysdeps/unix/sysv/linux/arc/kernel-features.h |  28 ++
>  sysdeps/unix/sysv/linux/arc/kernel_stat.h     |  26 ++
>  sysdeps/unix/sysv/linux/arc/mmap_internal.h   |  27 ++
>  sysdeps/unix/sysv/linux/arc/pt-vfork.S        |   1 +
>  sysdeps/unix/sysv/linux/arc/sigaction.c       |  31 ++
>  sysdeps/unix/sysv/linux/arc/sigrestorer.S     |  29 ++
>  sysdeps/unix/sysv/linux/arc/syscall.S         |  33 ++
>  sysdeps/unix/sysv/linux/arc/syscalls.list     |   3 +
>  sysdeps/unix/sysv/linux/arc/sysctl.mk         |   1 +
>  sysdeps/unix/sysv/linux/arc/sysdep.c          |  33 ++
>  sysdeps/unix/sysv/linux/arc/sysdep.h          | 224 +++++++++++++
>  sysdeps/unix/sysv/linux/arc/vfork.S           |  42 +++
>  17 files changed, 947 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/arc/arch-syscall.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/bits/timesize.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/clone.S
>  create mode 100644 sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/kernel-features.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/kernel_stat.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/mmap_internal.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/pt-vfork.S
>  create mode 100644 sysdeps/unix/sysv/linux/arc/sigaction.c
>  create mode 100644 sysdeps/unix/sysv/linux/arc/sigrestorer.S
>  create mode 100644 sysdeps/unix/sysv/linux/arc/syscall.S
>  create mode 100644 sysdeps/unix/sysv/linux/arc/syscalls.list
>  create mode 100644 sysdeps/unix/sysv/linux/arc/sysctl.mk
>  create mode 100644 sysdeps/unix/sysv/linux/arc/sysdep.c
>  create mode 100644 sysdeps/unix/sysv/linux/arc/sysdep.h
>  create mode 100644 sysdeps/unix/sysv/linux/arc/vfork.S
> 
> diff --git a/sysdeps/unix/sysv/linux/arc/arch-syscall.h b/sysdeps/unix/sysv/linux/arc/arch-syscall.h
> new file mode 100644
> index 000000000000..2b017eb5bbaa
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/arch-syscall.h
> @@ -0,0 +1,303 @@
> +/* 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_arc_gettls 246
> +#define __NR_arc_settls 245
> +#define __NR_arc_usr_cmpxchg 248
> +#define __NR_bind 200
> +#define __NR_bpf 280
> +#define __NR_brk 214
> +#define __NR_cacheflush 244
> +#define __NR_capget 90
> +#define __NR_capset 91
> +#define __NR_chdir 49
> +#define __NR_chroot 51
> +#define __NR_clock_adjtime64 405
> +#define __NR_clock_getres_time64 406
> +#define __NR_clock_gettime 113
> +#define __NR_clock_gettime64 403
> +#define __NR_clock_nanosleep 115
> +#define __NR_clock_nanosleep_time64 407
> +#define __NR_clock_settime 112
> +#define __NR_clock_settime64 404
> +#define __NR_clone 220
> +#define __NR_clone3 435
> +#define __NR_close 57
> +#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_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_fadvise64_64 223
> +#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_fcntl64 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_fstatfs64 44
> +#define __NR_fsync 82
> +#define __NR_ftruncate64 46
> +#define __NR_futex_time64 422
> +#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_getrlimit 163
> +#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_pgetevents_time64 416
> +#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_lgetxattr 9
> +#define __NR_linkat 37
> +#define __NR_listen 201
> +#define __NR_listxattr 11
> +#define __NR_llistxattr 12
> +#define __NR_llseek 62
> +#define __NR_lookup_dcookie 18
> +#define __NR_lremovexattr 15
> +#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_mmap2 222
> +#define __NR_mount 40
> +#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_time64 419
> +#define __NR_mq_timedsend_time64 418
> +#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_time64 414
> +#define __NR_prctl 167
> +#define __NR_pread64 67
> +#define __NR_preadv 69
> +#define __NR_preadv2 286
> +#define __NR_prlimit64 261
> +#define __NR_process_vm_readv 270
> +#define __NR_process_vm_writev 271
> +#define __NR_pselect6_time64 413
> +#define __NR_ptrace 117
> +#define __NR_pwrite64 68
> +#define __NR_pwritev 70
> +#define __NR_pwritev2 287
> +#define __NR_quotactl 60
> +#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_time64 417
> +#define __NR_recvmsg 212
> +#define __NR_remap_file_pages 234
> +#define __NR_removexattr 14
> +#define __NR_renameat 38
> +#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_time64 421
> +#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_time64 423
> +#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_time64 420
> +#define __NR_sendfile64 71
> +#define __NR_sendmmsg 269
> +#define __NR_sendmsg 211
> +#define __NR_sendto 206
> +#define __NR_set_mempolicy 237
> +#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_setrlimit 164
> +#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_statfs64 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_sysfs 247
> +#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_gettime64 408
> +#define __NR_timer_settime 110
> +#define __NR_timer_settime64 409
> +#define __NR_timerfd_create 85
> +#define __NR_timerfd_gettime64 410
> +#define __NR_timerfd_settime64 411
> +#define __NR_times 153
> +#define __NR_tkill 130
> +#define __NR_truncate64 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_time64 412
> +#define __NR_vhangup 58
> +#define __NR_vmsplice 75
> +#define __NR_wait4 260
> +#define __NR_waitid 95
> +#define __NR_write 64
> +#define __NR_writev 66

Ok, although I did not confered it was done with lastest Linux kernel 
releases used by build-many-glibcs.py. You might double check it.

> diff --git a/sysdeps/unix/sysv/linux/arc/bits/timesize.h b/sysdeps/unix/sysv/linux/arc/bits/timesize.h
> new file mode 100644
> index 000000000000..1259077c6412
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/bits/timesize.h
> @@ -0,0 +1,21 @@
> +/* Bit size of the time_t type at glibc build time, general case.
> +   Copyright (C) 2019-2020 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
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <bits/wordsize.h>
> +
> +#define __TIMESIZE	64

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/clone.S b/sysdeps/unix/sysv/linux/arc/clone.S
> new file mode 100644
> index 000000000000..c5ba38541163
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/clone.S
> @@ -0,0 +1,98 @@
> +/* clone() implementation for ARC.
> +   Copyright (C) 2008-2020 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +   Contributed by Andrew Jenner <andrew@codesourcery.com>, 2008.
> +
> +   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>
> +#include <tcb-offsets.h>
> +
> +#define CLONE_SETTLS		0x00080000
> +
> +/* int clone(int (*fn)(void *), void *child_stack,
> +           int flags, void *arg, ...
> +           < pid_t *ptid, struct user_desc *tls, pid_t *ctid > );
> +
> + NOTE: I'm assuming that the last 3 args are NOT var-args and in case all
> +	3 are not relevant, caller will nevertheless pass those as NULL.

Maybe we should update our clone prototype, although this might incur 
in a ABI break. The assumption here should be ok, since all other
implementations do the same.

> +
> + clone syscall in kernel (ABI: CONFIG_CLONE_BACKWARDS)
> +
> +  int sys_clone(unsigned long int clone_flags,
> +	        unsigned long int newsp,
> +		int __user *parent_tidptr,
> +		void *tls,
> +		int __user *child_tidptr).  */
> +
> +ENTRY (__clone)
> +	cmp	r0, 0		; @fn can't be NULL
> +	cmp.ne	r1, 0		; @child_stack can't be NULL
> +	bz	.L__sys_err
> +
> +	; save some of the orig args
> +	; r0 containg @fn will be clobbered AFTER syscall (with ret val)
> +	; rest are clobbered BEFORE syscall due to different arg ordering
> +	mov	r10, r0		; @fn
> +	mov	r11, r3		; @args
> +	mov	r12, r2		; @clone_flags
> +	mov	r9,  r5		; @tls
> +
> +	; adjust libc args for syscall
> +
> +	mov 	r0, r2		; libc @flags is 1st syscall arg
> +	mov	r2, r4		; libc @ptid
> +	mov	r3, r5		; libc @tls
> +	mov	r4, r6		; libc @ctid
> +	mov	r8, __NR_clone
> +	ARC_TRAP_INSN
> +
> +	cmp	r0, 0		; return code : 0 new process, !0 parent
> +	blt	.L__sys_err2	; < 0 (signed) error
> +	jnz	[blink]		; Parent returns
> +
> +	; ----- child starts here ---------
> +
> +	; Setup TP register (only recent kernels v4.19+ do that)
> +	and.f	0, r12, CLONE_SETTLS
> +	mov.nz	r25, r9

Do you still need to set it since the minimum supported kernel
for ARC is 5.1 ?

It should be safe for internal glibc usage, since for both pthread
and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
However this is still small race window if this is called directly 
with pthread cancellation or g*uid in multithread.

> +
> +	; child jumps off to @fn with @arg as argument, and returns here
> +	jl.d	[r10]
> +	mov	r0, r11
> +
> +	; exit() with result from @fn (already in r0)
> +	mov	r8, __NR_exit
> +	ARC_TRAP_INSN
> +	; In case it ever came back
> +	flag	1
> +
> +.L__sys_err:

Can't you use L(...) macro as other architectures? 

> +	mov	r0, -EINVAL
> +.L__sys_err2:
> +	; (1) No need to make -ve kernel error code as positive errno
> +	;   __syscall_error expects the -ve error code returned by kernel
> +	; (2) r0 still had orig -ve kernel error code
> +	; (3) Tail call to __syscall_error so we dont have to come back
> +	;     here hence instead of jmp-n-link (reg push/pop) we do jmp
> +	; (4) No need to route __syscall_error via PLT, B is inherently
> +	;     position independent
> +	b   __syscall_error
> +PSEUDO_END (__clone)
> +libc_hidden_def (__clone)
> +weak_alias (__clone, clone)

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h b/sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
> new file mode 100644
> index 000000000000..47faaecc8970
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
> @@ -0,0 +1,41 @@
> +/* Regularize <asm/unistd.h> definitions.  ARC version.
> +   Copyright (C) 2020 Free Software Foundation, Inc.
> +
> +   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
> +   <http://www.gnu.org/licenses/>.  */
> +
> +/* Adjustments to ARC asm-generic syscall ABI (3.9 kernel) for 64-bit time_t
> +   support.  */
> +
> +/* fstat64 and fstatat64 need to be replaced with statx.  */
> +
> +#undef __NR_fstat64
> +#undef __NR_fstatat64
> +
> +/* Replace all other 32-bit time syscalls with 64-bit variants.  */
> +
> +# undef __NR_clock_adjtime
> +# undef __NR_clock_getres
> +# undef __NR_futex
> +# undef __NR_mq_timedreceive
> +# undef __NR_mq_timedsend
> +# undef __NR_ppoll
> +# undef __NR_pselect6
> +# undef __NR_recvmmsg
> +# undef __NR_rt_sigtimedwait
> +# undef __NR_sched_rr_get_interval
> +# undef __NR_semtimedop
> +# undef __NR_timerfd_settime
> +# undef __NR_timerfd_gettime
> +# undef __NR_utimensat

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h b/sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
> new file mode 100644
> index 000000000000..296f3197ee31
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
> @@ -0,0 +1,6 @@
> +#define JMP_BUF_SIZE		(32 + 1 + 64 / (8 * sizeof (unsigned long int))) * sizeof (unsigned long int)
> +#define SIGJMP_BUF_SIZE		(32 + 1 + 64 / (8 * sizeof (unsigned long int))) * sizeof (unsigned long int)
> +#define JMP_BUF_ALIGN		__alignof__ (unsigned long int)
> +#define SIGJMP_BUF_ALIGN	__alignof__ (unsigned long int)
> +#define MASK_WAS_SAVED_OFFSET	(32 * sizeof (unsigned long int))
> +#define SAVED_MASK_OFFSET	(33 * sizeof (unsigned long int))

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/kernel-features.h b/sysdeps/unix/sysv/linux/arc/kernel-features.h
> new file mode 100644
> index 000000000000..4f23a34489eb
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/kernel-features.h
> @@ -0,0 +1,28 @@
> +/* Set flags signalling availability of kernel features based on given
> +   kernel version number.
> +
> +   Copyright (C) 2009-2020 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/>.  */
> +
> +/* The minimum supported kernel version for ARC is 5.1 (64-bit time, offsets),
> +   although the asm-generic ABI is from 3.9 (when Linux port was merged).  */
> +
> +#include_next <kernel-features.h>
> +
> +#undef __ASSUME_CLONE_DEFAULT
> +#define __ASSUME_CLONE_BACKWARDS 1

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/kernel_stat.h b/sysdeps/unix/sysv/linux/arc/kernel_stat.h
> new file mode 100644
> index 000000000000..8fdd86b9e843
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/kernel_stat.h
> @@ -0,0 +1,26 @@
> +/* Copyright (C) 2020 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 <bits/wordsize.h>
> +
> +/* Needed to elide the itemized copy code in common xstatconv.c.  */
> +#define STAT_IS_KERNEL_STAT 1
> +
> +/* Nice side-effect of 64-bit time_t switch is these are same.  */
> +#define XSTAT_IS_XSTAT64 1
> +
> +#define STATFS_IS_STATFS64 0

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/mmap_internal.h b/sysdeps/unix/sysv/linux/arc/mmap_internal.h
> new file mode 100644
> index 000000000000..19aa078dd45e
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/mmap_internal.h
> @@ -0,0 +1,27 @@
> +/* mmap - map files or devices into memory.  Linux/ARC version.
> +   Copyright (C) 2017-2020 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 MMAP_ARC_INTERNAL_H
> +#define MMAP_ARC_INTERNAL_H
> +
> +/* 8K is default but determine the shift dynamically with getpagesize.  */
> +#define MMAP2_PAGE_UNIT -1
> +
> +#include_next <mmap_internal.h>
> +
> +#endif

Ok.  I would be interesting if kernel could consolidate de mmap
implementation to return EINVAL for invalid offsets. A lot of
architectures have its own implementation to handle.

> diff --git a/sysdeps/unix/sysv/linux/arc/pt-vfork.S b/sysdeps/unix/sysv/linux/arc/pt-vfork.S
> new file mode 100644
> index 000000000000..1cc893170070
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/pt-vfork.S
> @@ -0,0 +1 @@
> +/* Not needed.  */

This file is not required since "nptl: Remove vfork IFUNC-based
forwarder from libpthread [BZ #20188]" (41d6f74e6cb6a9).

> diff --git a/sysdeps/unix/sysv/linux/arc/sigaction.c b/sysdeps/unix/sysv/linux/arc/sigaction.c
> new file mode 100644
> index 000000000000..2613eb883fb1
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sigaction.c
> @@ -0,0 +1,31 @@
> +/* ARC specific sigaction.
> +   Copyright (C) 1997-2020 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/>.  */
> +
> +#define SA_RESTORER	0x04000000
> +
> +extern void __default_rt_sa_restorer (void);
> +
> +#define SET_SA_RESTORER(kact, act)				\
> + ({								\
> +   (kact)->sa_restorer = __default_rt_sa_restorer;		\
> +   (kact)->sa_flags |= SA_RESTORER;				\
> + })
> +
> +#define RESET_SA_RESTORER(act, kact)
> +
> +#include <sysdeps/unix/sysv/linux/sigaction.c>

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/sigrestorer.S b/sysdeps/unix/sysv/linux/arc/sigrestorer.S
> new file mode 100644
> index 000000000000..cc3c1a0d09ff
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sigrestorer.S
> @@ -0,0 +1,29 @@
> +/* Default sigreturn stub for ARC Linux.
> +   Copyright (C) 2005-2020 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 <sys/syscall.h>
> +#include <sysdep.h>
> +#include <tcb-offsets.h>
> +
> +/* Note the NOP has to be outside body.  */
> +	nop

Wy exactly do you need it here?

> +ENTRY (__default_rt_sa_restorer)
> +	mov r8, __NR_rt_sigreturn
> +	ARC_TRAP_INSN
> +	j_s     [blink]

Ok.

> +PSEUDO_END_NOERRNO (__default_rt_sa_restorer)
> diff --git a/sysdeps/unix/sysv/linux/arc/syscall.S b/sysdeps/unix/sysv/linux/arc/syscall.S
> new file mode 100644
> index 000000000000..ff17e71575b1
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/syscall.S
> @@ -0,0 +1,33 @@
> +/* syscall - indirect system call.
> +   Copyright (C) 2017-2020 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>
> +
> +ENTRY (syscall)
> +	mov_s	r8, r0
> +	mov_s	r0, r1
> +	mov_s	r1, r2
> +	mov_s	r2, r3
> +	mov_s	r3, r4
> +	mov_s	r4, r5
> +	mov_s	r5, r6
> +
> +	ARC_TRAP_INSN
> +	brhi	r0, -1024, .Lcall_syscall_err
> +	j	[blink]
> +PSEUDO_END (syscall)

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/syscalls.list b/sysdeps/unix/sysv/linux/arc/syscalls.list
> new file mode 100644
> index 000000000000..d0ef5977ee06
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/syscalls.list
> @@ -0,0 +1,3 @@
> +# File name	Caller	Syscall name	Args	Strong name	Weak names
> +
> +cacheflush	-	cacheflush	i:pii	_flush_cache	cacheflush

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/sysctl.mk b/sysdeps/unix/sysv/linux/arc/sysctl.mk
> new file mode 100644
> index 000000000000..05a4e2f8c99b
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sysctl.mk
> @@ -0,0 +1 @@
> +# ARC doesn't support sysctl.

This file is not required since "Linux: Remove <sys/sysctl.h>
and the sysctl function" (076f09afbac1a).

> diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.c b/sysdeps/unix/sysv/linux/arc/sysdep.c
> new file mode 100644
> index 000000000000..42c8575ba461
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sysdep.c
> @@ -0,0 +1,33 @@
> +/* ARC wrapper for setting errno.
> +   Copyright (C) 1997-2020 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>
> +#include <errno.h>
> +
> +/* All syscall handlers land here to avoid generated code bloat due to
> +   GOT reference  to errno_location or it's equivalent.  */
> +int
> +__syscall_error (int err_no)
> +{
> +  __set_errno (-err_no);
> +  return -1;
> +}
> +
> +#if IS_IN (libc)
> +hidden_def (__syscall_error)
> +#endif

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h
> new file mode 100644
> index 000000000000..3aee9b95326f
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sysdep.h
> @@ -0,0 +1,224 @@
> +/* Assembler macros for ARC.
> +   Copyright (C) 2000-2020 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_ARC_SYSDEP_H
> +#define _LINUX_ARC_SYSDEP_H 1
> +
> +#include <sysdeps/arc/sysdep.h>
> +#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
> +
> +/* 32-bit time syscalls are not available, but the redefines allow generic
> +   wrappers to work.  */
> +#define __NR_clock_adjtime	__NR_clock_adjtime64
> +#define __NR_clock_getres	__NR_clock_getres_time64
> +#define __NR_futex		__NR_futex_time64
> +#define __NR_mq_timedreceive	__NR_mq_timedreceive_time64
> +#define __NR_mq_timedsend	__NR_mq_timedsend_time64
> +#define __NR_ppoll		__NR_ppoll_time64
> +#define __NR_pselect6		__NR_pselect6_time64
> +#define __NR_recvmmsg		__NR_recvmmsg_time64
> +#define __NR_rt_sigtimedwait	__NR_rt_sigtimedwait_time64
> +#define __NR_sched_rr_get_interval	__NR_sched_rr_get_interval_time64
> +#define __NR_semtimedop		__NR_semtimedop_time64
> +#define __NR_timerfd_gettime	__NR_timerfd_gettime64
> +#define __NR_timerfd_settime	__NR_timerfd_settime64
> +#define __NR_utimensat		__NR_utimensat_time64
> +
> +/* For RTLD_PRIVATE_ERRNO.  */
> +#include <dl-sysdep.h>
> +
> +#include <tls.h>
> +
> +#undef SYS_ify
> +#define SYS_ify(syscall_name)   __NR_##syscall_name
> +
> +#ifdef __ASSEMBLER__
> +
> +/* This is a "normal" system call stub: if there is an error,
> +   it returns -1 and sets errno.  */
> +
> +# undef PSEUDO
> +# define PSEUDO(name, syscall_name, args)			\
> +  PSEUDO_NOERRNO(name, syscall_name, args)	ASM_LINE_SEP	\
> +    brhi   r0, -4096, .Lcall_syscall_err	ASM_LINE_SEP
> +
> +# define ret	j_s  [blink]
> +
> +# undef PSEUDO_END
> +# define PSEUDO_END(name)					\
> +  SYSCALL_ERROR_HANDLER				ASM_LINE_SEP	\
> +  END (name)
> +
> +/* --------- Helper for SYSCALL_NOERRNO -----------
> +   This kind of system call stub never returns an error.
> +   We return the return value register to the caller unexamined.  */
> +
> +# undef PSEUDO_NOERRNO
> +# define PSEUDO_NOERRNO(name, syscall_name, args)		\
> +  .text						ASM_LINE_SEP	\
> +  ENTRY (name)					ASM_LINE_SEP	\
> +    DO_CALL (syscall_name, args)		ASM_LINE_SEP	\
> +
> +/* Return the return value register unexamined. Since r0 is both
> +   syscall return reg and function return reg, no work needed.  */
> +# define ret_NOERRNO						\
> +  j_s  [blink]		ASM_LINE_SEP
> +
> +# undef PSEUDO_END_NOERRNO
> +# define PSEUDO_END_NOERRNO(name)				\
> +  END (name)
> +
> +/* --------- Helper for SYSCALL_ERRVAL -----------
> +   This kind of system call stub returns the errno code as its return
> +   value, or zero for success.  We may massage the kernel's return value
> +   to meet that ABI, but we never set errno here.  */
> +
> +# undef PSEUDO_ERRVAL
> +# define PSEUDO_ERRVAL(name, syscall_name, args)		\
> +  PSEUDO_NOERRNO(name, syscall_name, args)	ASM_LINE_SEP
> +
> +/* Don't set errno, return kernel error (in errno form) or zero.  */
> +# define ret_ERRVAL						\
> +  rsub   r0, r0, 0				ASM_LINE_SEP	\
> +  ret_NOERRNO
> +
> +# undef PSEUDO_END_ERRVAL
> +# define PSEUDO_END_ERRVAL(name)				\
> +  END (name)
> +
> +
> +/* To reduce the code footprint, we confine the actual errno access
> +   to single place in __syscall_error().
> +   This takes raw kernel error value, sets errno and returns -1.  */
> +# if IS_IN (libc)
> +#  define CALL_ERRNO_SETTER_C	bl     PLTJMP(HIDDEN_JUMPTARGET(__syscall_error))
> +# else
> +#  define CALL_ERRNO_SETTER_C	bl     PLTJMP(__syscall_error)
> +# endif
> +
> +# define SYSCALL_ERROR_HANDLER				\
> +.Lcall_syscall_err:			ASM_LINE_SEP	\
> +    push_s   blink			ASM_LINE_SEP	\
> +    cfi_adjust_cfa_offset (4)		ASM_LINE_SEP	\
> +    cfi_rel_offset (blink, 0)		ASM_LINE_SEP	\
> +    CALL_ERRNO_SETTER_C			ASM_LINE_SEP	\
> +    pop_s  blink			ASM_LINE_SEP	\
> +    cfi_adjust_cfa_offset (-4)		ASM_LINE_SEP	\
> +    cfi_restore (blink)			ASM_LINE_SEP	\
> +    j_s      [blink]
> +
> +# define DO_CALL(syscall_name, args)				\
> +    mov    r8, SYS_ify (syscall_name)	ASM_LINE_SEP	\
> +    ARC_TRAP_INSN			ASM_LINE_SEP
> +
> +# define ARC_TRAP_INSN	trap_s 0
> +
> +#else  /* !__ASSEMBLER__ */
> +
> +# define SINGLE_THREAD_BY_GLOBAL		1
> +
> +# if IS_IN (libc)
> +extern int __syscall_error (int);
> +hidden_proto (__syscall_error)
> +# endif
> +
> +# define ARC_TRAP_INSN	"trap_s 0	\n\t"
> +
> +# undef INTERNAL_SYSCALL_NCS
> +# define INTERNAL_SYSCALL_NCS(number, nr_args, args...)	\
> +  ({								\
> +    /* Per ABI, r0 is 1st arg and return reg.  */		\
> +    register int __ret __asm__("r0");				\
> +    register int _sys_num __asm__("r8");			\
> +								\
> +    LOAD_ARGS_##nr_args (number, args)				\
> +								\
> +    __asm__ volatile (						\
> +                      ARC_TRAP_INSN				\
> +                      : "+r" (__ret)				\
> +                      : "r"(_sys_num) ASM_ARGS_##nr_args	\
> +                      : "memory");				\
> +                                                                \
> +    __ret; })
> +
> +# undef INTERNAL_SYSCALL
> +# define INTERNAL_SYSCALL(name, nr, args...) 	\
> +  INTERNAL_SYSCALL_NCS(SYS_ify(name), nr, args)
> +
> +/* Macros for setting up inline __asm__ input regs.  */
> +# define ASM_ARGS_0
> +# define ASM_ARGS_1	ASM_ARGS_0, "r" (__ret)
> +# define ASM_ARGS_2	ASM_ARGS_1, "r" (_arg2)
> +# define ASM_ARGS_3	ASM_ARGS_2, "r" (_arg3)
> +# define ASM_ARGS_4	ASM_ARGS_3, "r" (_arg4)
> +# define ASM_ARGS_5	ASM_ARGS_4, "r" (_arg5)
> +# define ASM_ARGS_6	ASM_ARGS_5, "r" (_arg6)
> +# define ASM_ARGS_7	ASM_ARGS_6, "r" (_arg7)
> +
> +/* Macros for converting sys-call wrapper args into sys call args.  */
> +# define LOAD_ARGS_0(nm, arg)				\
> +  _sys_num = (int) (nm);
> +
> +# define LOAD_ARGS_1(nm, arg1)				\
> +  __ret = (int) (arg1);					\
> +  LOAD_ARGS_0 (nm, arg1)
> +
> +/* Note that the use of _tmpX might look superflous, however it is needed
> +   to ensure that register variables are not clobbered if arg happens to be
> +   a function call itself. e.g. sched_setaffinity() calling getpid() for arg2
> +   Also this specific order of recursive calling is important to segregate
> +   the tmp args evaluation (function call case described above) and assigment
> +   of register variables.  */
> +
> +# define LOAD_ARGS_2(nm, arg1, arg2)			\
> +  int _tmp2 = (int) (arg2);				\
> +  LOAD_ARGS_1 (nm, arg1)				\
> +  register int _arg2 __asm__ ("r1") = _tmp2;
> +
> +# define LOAD_ARGS_3(nm, arg1, arg2, arg3)		\
> +  int _tmp3 = (int) (arg3);				\
> +  LOAD_ARGS_2 (nm, arg1, arg2)				\
> +  register int _arg3 __asm__ ("r2") = _tmp3;
> +
> +#define LOAD_ARGS_4(nm, arg1, arg2, arg3, arg4)		\
> +  int _tmp4 = (int) (arg4);				\
> +  LOAD_ARGS_3 (nm, arg1, arg2, arg3)			\
> +  register int _arg4 __asm__ ("r3") = _tmp4;
> +
> +# define LOAD_ARGS_5(nm, arg1, arg2, arg3, arg4, arg5)	\
> +  int _tmp5 = (int) (arg5);				\
> +  LOAD_ARGS_4 (nm, arg1, arg2, arg3, arg4)		\
> +  register int _arg5 __asm__ ("r4") = _tmp5;
> +
> +# define LOAD_ARGS_6(nm,  arg1, arg2, arg3, arg4, arg5, arg6)\
> +  int _tmp6 = (int) (arg6);				\
> +  LOAD_ARGS_5 (nm, arg1, arg2, arg3, arg4, arg5)	\
> +  register int _arg6 __asm__ ("r5") = _tmp6;
> +
> +# define LOAD_ARGS_7(nm, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
> +  int _tmp7 = (int) (arg7);				\
> +  LOAD_ARGS_6 (nm, arg1, arg2, arg3, arg4, arg5, arg6)	\
> +  register int _arg7 __asm__ ("r6") = _tmp7;
> +
> +/* Pointer mangling not yet supported.  */
> +# define PTR_MANGLE(var) (void) (var)
> +# define PTR_DEMANGLE(var) (void) (var)
> +
> +#endif /* !__ASSEMBLER__ */
> +
> +#endif /* linux/arc/sysdep.h */

Ok.

> diff --git a/sysdeps/unix/sysv/linux/arc/vfork.S b/sysdeps/unix/sysv/linux/arc/vfork.S
> new file mode 100644
> index 000000000000..ac1cce5258e0
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/vfork.S
> @@ -0,0 +1,42 @@
> +/* vfork for ARC Linux.
> +   Copyright (C) 2005-2020 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 <sys/syscall.h>
> +#include <sysdep.h>
> +#include <tcb-offsets.h>
> +#define _SIGNAL_H
> +#include <bits/signum.h>       /* For SIGCHLD */
> +
> +#define CLONE_VM		0x00000100
> +#define CLONE_VFORK		0x00004000
> +#define CLONE_FLAGS_FOR_VFORK	(CLONE_VM|CLONE_VFORK|SIGCHLD)
> +
> +ENTRY (__vfork)
> +	mov	r0, CLONE_FLAGS_FOR_VFORK
> +	mov_s	r1, sp
> +	mov	r8, __NR_clone
> +	ARC_TRAP_INSN
> +
> +	cmp	r0, 0
> +	jge	[blink]	; child continues
> +
> +	b   __syscall_error
> +PSEUDO_END (__vfork)
> +libc_hidden_def (__vfork)
> +
> +weak_alias (__vfork, vfork)
> 

Ok. As a side note I think we should start to think about deprecate
vfork.

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  reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-23  1:41 [PATCH v6 00/13] glibc port to ARC processors Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 01/13] ARC: ABI Implementation Vineet Gupta
     [not found]   ` <88508d10-2d29-026a-bb54-ad607154ab87@linaro.org>
2020-05-27 22:15     ` Vineet Gupta
2020-05-29 13:56       ` Adhemerval Zanella
     [not found]     ` <a56a35d4-3e9e-9a88-4be5-8553d5f11ad3@synopsys.com>
     [not found]       ` <87mu5jxkv7.fsf@oldenburg2.str.redhat.com>
2020-06-04 19:01         ` Vineet Gupta
2020-06-04 23:56           ` Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 02/13] ARC: startup and dynamic linking code Vineet Gupta
     [not found]   ` <17957ee6-2bc1-f43b-f184-f0703ba2765f@linaro.org>
2020-05-28  1:14     ` Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 03/13] ARC: Thread Local Storage support Vineet Gupta
     [not found]   ` <4f7a67fb-6f96-57e6-b827-d1ab5dd6733f@linaro.org>
2020-05-28  1:36     ` Vineet Gupta
2020-06-01 18:53       ` Adhemerval Zanella
2020-04-23  1:41 ` [PATCH v6 04/13] ARC: Atomics and Locking primitives Vineet Gupta
     [not found]   ` <03f4a9b3-b1ca-90fa-0b6a-609a3135267d@linaro.org>
2020-04-24  7:23     ` Vineet Gupta
     [not found]     ` <20200427215938.14136-1-vgupta@synopsys.com>
2020-04-27 22:13       ` [PATCH] semaphore: consolidate arch headers into a generic one Vineet Gupta
     [not found]       ` <ac93c301-36d3-b20a-d31c-50c1f3264c68@linaro.org>
2020-05-05 22:59         ` Vineet Gupta
2020-05-08 13:32           ` Adhemerval Zanella
2020-04-23  1:41 ` [PATCH v6 05/13] ARC: math soft float support Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 06/13] ARC: hardware floating point support Vineet Gupta
2020-05-29 14:12   ` Adhemerval Zanella
2020-05-29 22:28     ` Vineet Gupta
2020-05-29 23:50       ` Vineet Gupta
2020-06-02 17:51         ` Joseph Myers
     [not found]         ` <07887c48-7e07-9f89-035d-3f336a16f2da@synopsys.com>
2020-06-02 18:13           ` static inline math functions (was Re: [PATCH v6 06/13] ARC: hardware floating point support) Joseph Myers
2020-06-02 18:35             ` Adhemerval Zanella
2020-06-05  4:44         ` [PATCH v6 06/13] ARC: hardware floating point support Vineet Gupta
2020-06-05 17:22           ` Adhemerval Zanella
2020-06-02 17:48       ` Joseph Myers
2020-04-23  1:41 ` [PATCH v6 07/13] ARC: Linux Syscall Interface Vineet Gupta
2020-05-29 16:49   ` Adhemerval Zanella [this message]
2020-05-30  2:02     ` Vineet Gupta
2020-06-03 19:46     ` Vineet Gupta
2020-06-03 20:04       ` Adhemerval Zanella
2020-06-03 20:17         ` Vineet Gupta
2020-06-04 11:06           ` Adhemerval Zanella
2020-04-23  1:41 ` [PATCH v6 08/13] ARC: Linux ABI Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 09/13] ARC: Linux Startup and Dynamic Loading Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 10/13] ARC: ABI lists Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 11/13] ARC: Build Infrastructure Vineet Gupta
2020-06-03 19:58   ` Adhemerval Zanella
2020-06-04 15:25     ` Vineet Gupta
2020-06-04 17:05       ` Adhemerval Zanella
2020-06-08  4:18         ` Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 12/13] build-many-glibcs.py: Enable ARC builds Vineet Gupta
2020-04-23  1:41 ` [PATCH v6 13/13] Documentation for ARC port Vineet Gupta
2020-05-04 21:21 ` [PATCH v6 00/13] glibc port to ARC processors Vineet Gupta
2020-05-15  0:45   ` Vineet Gupta
2020-05-27  1:49     ` Vineet Gupta
     [not found]       ` <d7f1176c-87c6-90c6-161c-4705a47837ea@linaro.org>
2020-05-27 18:38         ` Vineet Gupta

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