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Re: [RFC PATCH 09/10] C-SKY: Linux Syscall Interface
On 16/03/2018 17:58, Mao Han wrote:
> diff --git a/sysdeps/unix/sysv/linux/csky/abiv2_mmap.S b/sysdeps/unix/sysv/linux/csky/abiv2_mmap.S
> new file mode 100644
> index 0000000..e759ba2
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/abiv2_mmap.S
> @@ -0,0 +1,62 @@
> +/* Copyright (C) 2018 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 <sysdep.h>
> +
> +/* void *mmap(void *addr, size_t len, int prot, int flags,
> + int fildes, off_t off); */
> +
> +ENTRY (__mmap)
> + subi sp, 24
> + stm a0-a3, (sp) /* store arg1-arg4 */
> + ldw t0, (sp, 24)
> + stw t0, (sp, 16) /* store arg5 */
> + ldw t0, (sp, 28)
> + stw t0, (sp, 20) /* store arg6 */
> +
> + mov t0, r7 /* save r7 */
> + lrw r7, __NR_mmap
> + mov a0, sp
> + trap 0
> + addi sp, sp, 24
> + mov r7, t0
> + lrw t0, 0xfffff000
> + cmphs a0, t0
> + bf 1f
> +#ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw r15, (sp, 4)
> + grs gb, .Lgetpc
> +.Lgetpc:
> + lrw t0, .Lgetpc@GOTPC
> + addu gb, gb, t0
> + lrw t0, __syscall_error@PLT
> + ldr.w t0, (gb, t0 << 0)
> + jsr t0
> + ldw gb, (sp, 0)
> + ldw r15, (sp, 4)
> + addi sp, 8
> +#else
> + jmpi __syscall_error
> +#endif /* __PIC__ */
> +1:
> + rts
> +PSEUDO_END (__mmap)
> +
> +weak_alias (__mmap, mmap)
> +libc_hidden_builtin_def (__mmap)
Is there anything preventing C-SKY to use linux default mmap.c
implementation? It seems it using a kABI similar to s390 which
passes all the argument in the stack, so you just need to
follow the idea of sysdeps/unix/sysv/linux/s390/mmap_internal.h.
> diff --git a/sysdeps/unix/sysv/linux/csky/abiv2_socket.S b/sysdeps/unix/sysv/linux/csky/abiv2_socket.S
> new file mode 100644
> index 0000000..f2b8ca8
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/abiv2_socket.S
> @@ -0,0 +1,152 @@
> +/* Copyright (C) 2018 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 <sysdep-cancel.h>
> +#include <socketcall.h>
> +
> +#define P(a, b) P2(a, b)
> +#define P2(a, b) a##b
> +
> +/* The socket-oriented system calls are handled unusally in Linux.
> + They are all gated through the single `socketcall' system call number.
> + `socketcall' takes two arguments: the first is the subcode, specifying
> + which socket function is being called; and the second is a pointer to
> + the arguments to the specific function.
> +
> + The .S files for the other calls just #define socket and #include this. */
> +
> +#ifndef NARGS
> +#ifdef socket
> +#error NARGS not defined
> +#endif
> +#define NARGS 3
> +#endif
> +
> +#ifndef __socket
> +# ifndef NO_WEAK_ALIAS
> +# define __socket P(__,socket)
> +# else
> +# define __socket socket
> +# endif
> +#endif
> +
> +ENTRY (__socket)
> + subi sp, 32
> + .cfi_def_cfa_offset 32
> +#if NARGS >= 1
> + stw a0, (sp, 0)
> +#endif
> +
> +#if NARGS >= 2
> + stw a1, (sp, 4)
> +#endif
> +
> +#if NARGS >= 3
> + stw a2, (sp, 8)
> +#endif
> +
> +#if NARGS >= 4
> + stw a3, (sp, 12)
> +#endif
> +
> +#if NARGS >= 5
> + ldw t0, (sp, 32)
> + stw t0, (sp, 16)
> +#endif
> +
> +#if NARGS >= 6
> + ldw t0, (sp, 36)
> + stw t0, (sp, 20)
> +#endif
> +
> +#if defined NEED_CANCELLATION && defined CENABLE
> + stw r15, (sp, 24)
> + .cfi_offset 15, -8
> + stw gb, (sp, 28)
> + .cfi_offset 28, -4
> + SINGLE_THREAD_P
> + bt .Lsocket_cancel
> +#endif
> +
> + mov t0, r7
> + lrw r7, __NR_socketcall
> + movi a0, P(SOCKOP_, socket)
> + mov a1, sp
> + trap 0
> + cfi_remember_state
> + .cfi_def_cfa_offset 40
> + addi sp, 32
> + .cfi_def_cfa_offset 0
> + mov r7, t0
> + PSEUDO_RET
> +
> +#if defined NEED_CANCELLATION && defined CENABLE
> +.Lsocket_cancel:
> + /* GET GB */
> + cfi_restore_state
> + grs gb, .Lgetpc
> +.Lgetpc:
> + lrw t0, .Lgetpc@GOTPC
> + addu gb, t0
> +
> + CENABLE
> + mov t1, a0 /* save CENABLE return value */
> + mov t0, r7
> + lrw r7, __NR_socketcall
> + movi a0, P(SOCKOP_, socket)
> + mov a1, sp
> + trap 0
> + stw a0, (sp, 0)
> + mov r7, t0
> + mov a0, t1
> + CDISABLE
> + ldw a0, (sp, 0)
> + ldw r15, (sp, 24)
> + .cfi_restore 15
> + ldw gb, (sp, 28)
> + .cfi_restore 28
> + addi sp, 32
> + .cfi_def_cfa_offset 0
> + btsti a0, 31
> + bf 3f
> +#ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw r15, (sp, 4)
> + /* must cal gb here, gb used by SYSCALL_ERROR ,why? FIXME */
> + grs gb, .Lgetpc2
> +.Lgetpc2:
> + lrw t0, .Lgetpc2@GOTPC
> + addu gb, gb, t0
> +
> + bsr SYSCALL_ERROR
> + ldw r15, (sp, 4)
> + ldw gb, (sp, 0)
> + addi sp, 8
> +#else
> + jmpi SYSCALL_ERROR
> +#endif
> +3:
> + rts
> +#endif
> +
> +PSEUDO_END(__socket)
> +
> +libc_hidden_def (__socket)
> +#ifndef NO_WEAK_ALIAS
> +weak_alias (__socket, socket)
> +#endif
The socket.S common gate has been removed on all architectures and I
prefer to continue doing so. If C-SKY does not follow generic kernel
ABI which prefer wire-up socket syscalls it is a matter to define
__ASSUME_SOCKETCALL in kernel-features.h. Current code should use
the wire-up call if the syscall is defined, otherwise the socketcall
is used instead.
> diff --git a/sysdeps/unix/sysv/linux/csky/abiv2_syscall.S b/sysdeps/unix/sysv/linux/csky/abiv2_syscall.S
> new file mode 100644
> index 0000000..90218bf
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/abiv2_syscall.S
> @@ -0,0 +1,69 @@
> +/* Copyright (C) 2018 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 <sysdep.h>
> +
> +/* long syscall(long sysnum, long a, long b, long c, long d, long e, long f) */
> +
> +ENTRY (syscall)
> + subi sp, 8
> + stw r4, (sp, 0)
> + stw r5, (sp, 4)
> +
> + mov t0, r7
> + mov r7, a0 /* r7 = sysnum */
> +
> + mov a0, a1 /* arg1 = a */
> + mov a1, a2 /* arg2 = b */
> + mov a2, a3 /* arg3 = c */
> + ldw a3, (sp, 8) /* arg4 = d */
> + ldw r4, (sp, 12) /* arg5 = e */
> + ldw r5, (sp, 16) /* arg6 = f */
> + trap 0
> +
> + mov r7, t0
> +
> + ldw r4, (sp, 0)
> + ldw r5, (sp, 4)
> + addi sp, 8
> +
> + lrw t0, 0xfffff000
> + cmphs a0, t0
> + bt do_syscall_error
> + rts
> +PSEUDO_END (syscall)
> +
> +do_syscall_error:
> +#ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw lr, (sp, 4)
> + grs gb, .Lgetpc
> +.Lgetpc:
> + lrw t0, .Lgetpc@GOTPC
> + addu gb, gb, t0
> + lrw t0, __syscall_error@PLT
> + ldr.w t0, (gb, t0 << 0)
> + jsr t0
> + ldw gb, (sp, 0)
> + ldw lr, (sp, 4)
> + addi sp, 8
> +#else
> + jmpi __syscall_error
> +#endif /* __PIC__ */
> + rts
> +
> diff --git a/sysdeps/unix/sysv/linux/csky/abiv2_vfork.S b/sysdeps/unix/sysv/linux/csky/abiv2_vfork.S
> new file mode 100644
> index 0000000..88cdc8a
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/abiv2_vfork.S
> @@ -0,0 +1,45 @@
> +/* Copyright (C) 2018 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 <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)
> +#ifdef SAVE_PID
> + SAVE_PID
> +#endif
> + mov t0, r7
> + lrw r7, __NR_vfork
> + trap 0
> + mov r7, t0
> +#ifdef RESTORE_PID
> + RESTORE_PID
> +#endif
> + PSEUDO_RET
> + rts
> +
> +PSEUDO_END (__vfork)
> +libc_hidden_def (__vfork)
> +
> +weak_alias (__vfork, vfork)
> +strong_alias (__vfork, __libc_vfork)
> diff --git a/sysdeps/unix/sysv/linux/csky/alphasort64.c b/sysdeps/unix/sysv/linux/csky/alphasort64.c
> new file mode 100644
> index 0000000..0b5ae47
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/alphasort64.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/alphasort64.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/brk.c b/sysdeps/unix/sysv/linux/csky/brk.c
> new file mode 100644
> index 0000000..00d42c2
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/brk.c
> @@ -0,0 +1,61 @@
> +/* brk system call for Linux/C-SKY.
> + Copyright (C) 2018 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/>. */
> +
> +#ifdef __CSKYABIV2__
> +# include "abiv2_brk.c"
> +#else
> +
> +#include <unistd.h>
> +#include <sys/syscall.h>
> +#include <errno.h>
> +
> +/* This must be initialized data because commons can't have aliases. */
> +void * __curbrk = 0;
> +
> +/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
> + to work around different old braindamage in the old Linux/x86 ELF
> + dynamic linker. Sigh. */
> +weak_alias (__curbrk, ___brk_addr)
> +
> +int __brk (void *addr)
> +{
> + void *newbrk;
> +
> + {
> + register long int res __asm__("r2") = (long int)addr;
> +
> + __asm__ volatile ("lrw r1, %1\n\t"
> + "trap 0\n\t"
> + :"+r" (res)
> + :"i" (__NR_brk) :"r1");
> + newbrk = (void *) res;
> + }
> + __curbrk = newbrk;
> +
> + if (newbrk < addr)
> + {
> + __set_errno (ENOMEM);
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +weak_alias (__brk, brk)
> +
> +#endif
> diff --git a/sysdeps/unix/sysv/linux/csky/clone.S b/sysdeps/unix/sysv/linux/csky/clone.S
> new file mode 100644
> index 0000000..67ac7d1
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/clone.S
> @@ -0,0 +1,125 @@
> +/* Copyright (C) 2018 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/>. */
> +
> +/* clone() is even more special than fork() as it mucks with stacks
> + and invokes a function in the right context after its all over. */
> +
> +#ifdef __CSKYABIV2__
> +# include "abiv2_clone.S"
> +#else
> +
> +# include <sysdep.h>
> +# define _ERRNO_H 1
> +# include <bits/errno.h>
> +# include <csky_readtp.h>
> +
> +# define CLONE_VM 8 /* 11 makes btsti easier, 0x00000100 in real */
> +# define CLONE_THREAD 16 /* 0x00010000 in real */
> +
> +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
> + pid_t *ptid, struct user_desc *tls, pid_t *ctid); */
> +
> + .text
> +ENTRY(__clone)
> + /* Sanity check arguments. */
> + cmpnei r2, 0
> + bf __error_arg /* no NULL function pointers */
> + cmpnei r3, 0
> + bf __error_arg /* no NULL function pointers */
I think you mean no NULL stack pointer here.
> +
> + subi r3, 8
> + stw r2, (r3, 0) /* insert the args onto the new stack */
> + stw r5, (r3, 4) /* insert the args onto the new stack */
> +
> + ldw r5, (sp, 0) /* arg4 = ctid */
> +# ifdef RESET_PID
> + subi r3, 8
> + stw r4, (r3, 0x0) /* save r4(flags) */
> +# endif
There is no more RESET_PID in upstream, you can drop this code.
> +
> + mov r2, r4 /* arg1 = flags */
> + mov r4, r6 /* arg3 = ptid */
> + mov r6, r7 /* arg5 = tls */
> + lrw r1, __NR_clone /* do syscall */
> + trap 0
> +
> + btsti r2, 31 /* is r2 less than zero? */
> + bt do_syscall_error
> + cmpnei r2, 0
> + bf 1f
> + rts
> +PSEUDO_END (__clone)
> +
> +1:
> +# ifdef RESET_PID
> + ld.w r4, (sp, 0x0)
> + btsti r4, CLONE_THREAD /* judge flags */
> + bt 3f
> + csky_read_tp
> + mov r6, r2
> +
> + btsti r4, CLONE_VM /* judge flags */
> + bmaski r2, 0 /* if CLONE_VM not set, pid=tid=-1 */
> + bt 2f
> + lrw r1, __NR_getpid /* else get pid via getpid syscall */
> + trap 0
> +2:
> + lrw r7, PID_OFFSET
> + add r7, r6
> + stw r2, (r7) /* save pid */
> + lrw r7, TID_OFFSET
> + add r7, r6
> + stw r2, (r7) /* save tid */
> +3:
> + addi sp, 8
> +# endif /* RESET_PID */
Same as before.
> + ldw r2, (sp, 4) /* restore args from new sp */
> + ldw r3, (sp, 0) /* restore args from new sp */
> + addi sp, 8
> +
> + jsr r3
> + lrw r1, __NR_exit
> + trap 0
> +
> +__error_arg:
> + lrw r2, -EINVAL
> +
> +do_syscall_error:
> +# ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw r15, (sp, 4)
> + bsr .Lgetpc
> +.Lgetpc:
> + lrw gb, .Lgetpc@GOTPC
> + addu gb, r15
> + lrw r7, __syscall_error@PLT
> + addu r7, gb
> + ldw r7, (r7)
> + jsr r7
> + ldw gb, (sp, 0)
> + ldw r15, (sp, 4)
> + addi sp, 8
> +# else
> + jmpi __syscall_error
> +# endif /* __PIC__ */
> + rts
> +
> +libc_hidden_def (__clone)
> +weak_alias (__clone, clone)
> +
> +#endif /* __CSKYABIV2__*/
> diff --git a/sysdeps/unix/sysv/linux/csky/ftruncate64.c b/sysdeps/unix/sysv/linux/csky/ftruncate64.c
> new file mode 100644
> index 0000000..47c38e6
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/ftruncate64.c
> @@ -0,0 +1,41 @@
> +/* Copyright (C) 2018 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 <sys/types.h>
> +#include <errno.h>
> +#include <endian.h>
> +#include <unistd.h>
> +
> +#include <sysdep.h>
> +#include <sys/syscall.h>
> +
> +/* Truncate the file FD refers to to LENGTH bytes. */
> +int
> +__ftruncate64 (int fd, off64_t length)
> +{
> + unsigned int low = length & 0xffffffff;
> + unsigned int high = length >> 32;
> +#ifdef __CSKYABIV2__
> + int result = INLINE_SYSCALL (ftruncate64, 3, fd,
> + __LONG_LONG_PAIR (high, low));
> +#else
> + int result = INLINE_SYSCALL (ftruncate64, 4, fd, 0,
> + __LONG_LONG_PAIR (high, low));
> +#endif
> + return result;
> +}
> +weak_alias (__ftruncate64, ftruncate64)
With recent INLINE_SYSCALL_CALL, which generic linux ftruncate64 uses, you do not
need to condicionaly the code for different argument argument number. You just
need to define the expected SYSCALL_LL64 macro for the required API and
INLINE_SYSCALL_CALL will issue the syscall with correct argument.
So I think this arch-specific implementation is not really required.
> diff --git a/sysdeps/unix/sysv/linux/csky/fxstat.c b/sysdeps/unix/sysv/linux/csky/fxstat.c
> new file mode 100644
> index 0000000..4f219f0
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/fxstat.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/fxstat.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/fxstatat.c b/sysdeps/unix/sysv/linux/csky/fxstatat.c
> new file mode 100644
> index 0000000..0f8b313
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/fxstatat.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/fxstatat.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/getcontext.S b/sysdeps/unix/sysv/linux/csky/getcontext.S
> new file mode 100644
> index 0000000..447c15b
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/getcontext.S
> @@ -0,0 +1,108 @@
> +/* Copyright (C) 2018 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/>. */
> +
> +#ifdef __CSKYABIV2__
> +#include "abiv2_getcontext.S"
> +#else
> +
> +#include <sysdep.h>
> +
> +#include "ucontext_i.h"
> +
> +/* int getcontext (ucontext_t *ucp) */
> +
> +ENTRY(__getcontext)
> + /* No need to save r2-r7 or a0-a3 */
> + mov r7, r2
> +
> + /* return zero */
> + lrw r2, MCONTEXT_CSKY_A0
> + add r2, r7
> + movi r1, 0
> + stw r1, (r2)
> +
> + lrw r2, MCONTEXT_CSKY_R8
> + add r2, r7
> + stw r8, (r2, 0) /* save r8 */
> + stw r9, (r2, 4) /* save r9 */
> + stw r10, (r2, 8) /* save r10 */
> + stw r11, (r2, 12) /* save r11 */
> + stw r12, (r2, 16) /* save r12 */
> + stw r13, (r2, 20) /* save r13 */
> + stw r14, (r2, 24) /* save r14 */
> + stw r15, (r2, 28) /* save lr */
> +
> +
> + lrw r2, MCONTEXT_CSKY_SP
> + add r2, r7
> + stw sp, (r2) /* save sp */
> +
> + lrw r2, MCONTEXT_CSKY_LR
> + add r2, r7
> + stw r15, (r2) /* Return to LR */
> +
> + lrw r2, MCONTEXT_CSKY_PC
> + add r2, r7
> + stw r15, (r2) /* Return to LR */
> +
> + lrw r2, MCONTEXT_CSKY_A0
> + add r2, r7
> + movi r3, 0
> + stw r3, (r2) /* Return zero */
> +
> + /* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
> + lrw r2, SIG_BLOCK
> + movi r3, 0
> + lrw r4, UCONTEXT_SIGMASK
> + add r4, r7
> +
> + subi sp, 8
> + stw r7, (sp, 0)
> +
> + /* do sigprocmask syscall */
> +#ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw lr, (sp, 4)
> + bsr .Lgetpc
> +.Lgetpc:
> + lrw gb, .Lgetpc@GOTPC
> + addu gb, r15
> + lrw r7, __sigprocmask@PLT
> + addu r7, gb
> + ldw r7, (r7)
> + jsr r7
> + ldw gb, (sp, 0)
> + ldw lr, (sp, 4)
> + addi sp, 8
> +#else
> + jsri __sigprocmask
> +#endif
> +
> + ldw r7, (sp, 0)
> + addi sp, 8
> + lrw r2, MCONTEXT_CSKY_LR
> + add r2, r7
> + /* restore r15 for sigprocmask changes */
> + ldw r15, (r2)
> + movi r2, 0 /* return 0 */
> + jmp r15
> +END(__getcontext)
> +
> +weak_alias(__getcontext, getcontext)
> +
> +#endif /* __CSKYABIV2__*/
> diff --git a/sysdeps/unix/sysv/linux/csky/getdents64.c b/sysdeps/unix/sysv/linux/csky/getdents64.c
> new file mode 100644
> index 0000000..0c75fb5
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/getdents64.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/getdents64.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/libc-read_tp.S b/sysdeps/unix/sysv/linux/csky/libc-read_tp.S
> new file mode 100644
> index 0000000..ca9d2b8
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/libc-read_tp.S
> @@ -0,0 +1 @@
> +#include <read_tp.S>
> diff --git a/sysdeps/unix/sysv/linux/csky/lockf64.c b/sysdeps/unix/sysv/linux/csky/lockf64.c
> new file mode 100644
> index 0000000..a88f5a7
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/lockf64.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/lockf64.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/lxstat.c b/sysdeps/unix/sysv/linux/csky/lxstat.c
> new file mode 100644
> index 0000000..2371cd9
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/lxstat.c
> @@ -0,0 +1,2 @@
> +#include <sysdeps/unix/sysv/linux/i386/lxstat.c>
> +
> diff --git a/sysdeps/unix/sysv/linux/csky/mmap.S b/sysdeps/unix/sysv/linux/csky/mmap.S
> new file mode 100644
> index 0000000..0d27ba5
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/mmap.S
> @@ -0,0 +1,65 @@
> +/* Copyright (C) 2018 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/>. */
> +
> +#ifdef __CSKYABIV2__
> +# include "abiv2_mmap.S"
> +#else
> +
> +#include <sysdep.h>
> +
> +/*void *mmap(void *addr, size_t len, int prot, int flags,
> + int fildes, off_t off); */
> +ENTRY (__mmap)
> + subi sp, 24
> + stw r2, (sp, 0)
> + stw r3, (sp, 4)
> + stw r4, (sp, 8)
> + stw r5, (sp, 12)
> + stw r6, (sp, 16)
> + stw r7, (sp, 20)
> + mov r2, sp
> + lrw r1, __NR_mmap
> + trap 0
> + addi sp, 24
> + lrw r3, 0xfffff000
> + cmphs r2, r3
> + bf 1f
> +#ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw r15, (sp, 4)
> + bsr .Lgetpc
> +.Lgetpc:
> + lrw gb, .Lgetpc@GOTPC
> + addu gb, r15
> + lrw r7, __syscall_error@PLT
> + addu r7, gb
> + ldw r7, (r7)
> + jsr r7
> + ldw gb, (sp, 0)
> + ldw r15, (sp, 4)
> + addi sp, 8
> +#else
> + jmpi __syscall_error
> +#endif /* __PIC__ */
> +1:
> + rts
> +PSEUDO_END (__mmap)
> +
> +weak_alias (__mmap, mmap)
> +libc_hidden_builtin_def (__mmap)
> +#endif /* __CSKYABVI2__*/
Same remark for abiv2_mmap.S applies here.
> diff --git a/sysdeps/unix/sysv/linux/csky/pt-vfork.S b/sysdeps/unix/sysv/linux/csky/pt-vfork.S
> new file mode 100644
> index 0000000..9bbd34c
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/pt-vfork.S
> @@ -0,0 +1,50 @@
> +/* Copyright (C) 2018 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 <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_compat)
> +#ifdef SAVE_PID
> + SAVE_PID
> +#endif
> +
> +#ifdef __CSKYABIV2__
> + mov t0, r7
> + lrw r7, __NR_vfork
> + trap 0
> + mov r7, t0
> +#else
> + lrw r1, __NR_vfork
> + trap 0
> +#endif
> +
> +#ifdef RESTORE_PID
> + RESTORE_PID
> +#endif
> + PSEUDO_RET
> + rts
> +
> +PSEUDO_END (vfork_compat)
> +
> +strong_alias (vfork_compat, vfork_compat2)
> diff --git a/sysdeps/unix/sysv/linux/csky/read_tp.S b/sysdeps/unix/sysv/linux/csky/read_tp.S
> new file mode 100644
> index 0000000..99c6d1a
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/read_tp.S
> @@ -0,0 +1,47 @@
> +/* Copyright (C) 2018 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 <features.h>
> +#include <sysdep.h>
> +
> +/* This function is exported from libc for use by user code. libpthread, librt,
> + and the dynamic linker get their own private copies, for
> + performance (and in the case of ld.so, out of necessity); those are
> + all hidden. */
> +
> +/*
> + * __read_tp
> + * clobbe r0, others had to be saved
> + *
> + */
> +#if IS_IN (libc)
> + .global __read_tp
> +#else
> + .hidden __read_tp
> +#endif
> +#ifdef __CSKYABIV2__
> +ENTRY (__read_tp)
> + mov r0, r31
> + rts
> +END (__read_tp)
> +#else
> +ENTRY (__read_tp)
> + trap 3
> + rts
> +END (__read_tp)
> +#endif
> +
> diff --git a/sysdeps/unix/sysv/linux/csky/readahead.c b/sysdeps/unix/sysv/linux/csky/readahead.c
> new file mode 100644
> index 0000000..47c44c3
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/readahead.c
> @@ -0,0 +1,44 @@
> +/* Provide kernel hint to read ahead.
> + Copyright (C) 2018 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 <errno.h>
> +#include <fcntl.h>
> +#include <sys/types.h>
> +#include <endian.h>
> +
> +#include <sysdep.h>
> +#include <sys/syscall.h>
> +
> +ssize_t
> +__readahead (int fd, off64_t offset, size_t count)
> +{
> +#ifdef __CSKYABVI2__
> + return INLINE_SYSCALL (readahead, 4, fd,
> + __LONG_LONG_PAIR ((off_t) (offset >> 32),
> + (off_t) (offset & 0xffffffff)),
> + count);
> +#else
> + return INLINE_SYSCALL (readahead, 5, fd, 0,
> + __LONG_LONG_PAIR ((off_t) (offset >> 32),
> + (off_t) (offset & 0xffffffff)),
> + count);
> +
> +#endif
> +}
> +
> +weak_alias (__readahead, readahead)
I would like to avoid adding another arch-specific Linux implementation while
we can consolidate Linux implementation.
On generic implementation (sysdeps/unix/sysv/linux/readahead.c) we can drop
the __NR_readahead exist check since for Linux 3.2 the syscall is presented
in all supported architectures. And for generic implementation we can use
current macros to handle kABI with a generic call like:
ssize_t
__readahead (int fd, off64_t offset, size_t count)
{
return INLINE_SYSCALL_CALL (readahead, fd,
__ALIGNMENT_ARG SYSCALL_LL64 (length));
}
So it will be a matter to define both __ALIGNMENT_ARG and SYCALL_LL64 correctly
for C-SKY, as it is already done for other architectures.
> diff --git a/sysdeps/unix/sysv/linux/csky/readdir64.c b/sysdeps/unix/sysv/linux/csky/readdir64.c
> new file mode 100644
> index 0000000..2ea26dd
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/readdir64.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/readdir64.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/readdir64_r.c b/sysdeps/unix/sysv/linux/csky/readdir64_r.c
> new file mode 100644
> index 0000000..9f54f89
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/readdir64_r.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/readdir64_r.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/scandir64.c b/sysdeps/unix/sysv/linux/csky/scandir64.c
> new file mode 100644
> index 0000000..506fd88
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/scandir64.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/scandir64.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/socket.S b/sysdeps/unix/sysv/linux/csky/socket.S
> new file mode 100644
> index 0000000..3ceb232
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/socket.S
> @@ -0,0 +1,171 @@
> +/* Copyright (C) 2018 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/>. */
> +
> +#ifdef __CSKYABIV2__
> +#include "abiv2_socket.S"
> +#else
> +
> +#include <sysdep-cancel.h>
> +#include <socketcall.h>
> +
> +#define P(a, b) P2(a, b)
> +#define P2(a, b) a##b
> +
> +/* The socket-oriented system calls are handled unusally in Linux.
> + They are all gated through the single `socketcall' system call number.
> + `socketcall' takes two arguments: the first is the subcode, specifying
> + which socket function is being called; and the second is a pointer to
> + the arguments to the specific function.
> +
> + The .S files for the other calls just #define socket and #include this. */
> +
> +#ifndef NARGS
> +#ifdef socket
> +#error NARGS not defined
> +#endif
> +#define NARGS 3
> +#endif
> +
> +#ifndef __socket
> +# ifndef NO_WEAK_ALIAS
> +# define __socket P(__,socket)
> +# else
> +# define __socket socket
> +# endif
> +#endif
> +
> +ENTRY (__socket)
> + subi sp, 32
> + subi sp, 8
> + .cfi_def_cfa_offset 40
> +#if NARGS >= 1
> + stw r2, (sp, 0)
> + .cfi_offset 2, -40
> +#endif
> +
> +#if NARGS >= 2
> + stw r3, (sp, 4)
> + .cfi_offset 3, -36
> +#endif
> +
> +#if NARGS >= 3
> + stw r4, (sp, 8)
> + .cfi_offset 4, -32
> +#endif
> +
> +#if NARGS >= 4
> + stw r5, (sp, 12)
> + .cfi_offset 5, -28
> +#endif
> +
> +#if NARGS >= 5
> + stw r6, (sp, 16)
> + .cfi_offset 6, -24
> +#endif
> +
> +#if NARGS >= 6
> + stw r7, (sp, 20)
> + .cfi_offset 7, -20
> +#endif
> +
> +#if defined NEED_CANCELLATION && defined CENABLE
> + stw r15, (sp, 24)
> + .cfi_offset 15, -16
> + st.w r14, (sp, 28)
> + .cfi_offset 14, -12
> + st.w r9, (sp, 32)
> + .cfi_offset 9, -8
> + SINGLE_THREAD_P
> + bt .Lsocket_cancel
> +#endif
> +
> + lrw r1, __NR_socketcall
> + movi r2, P(SOCKOP_, socket)
> + mov r3, sp
> + trap 0
> + cfi_remember_state
> + .cfi_def_cfa_offset 40
> + addi sp, 32
> + addi sp, 8
> + .cfi_def_cfa_offset 0
> + mov r1, r15
> + PSEUDO_RET
> +
> +#if defined NEED_CANCELLATION && defined CENABLE
> +.Lsocket_cancel:
> + cfi_restore_state
> + /* GET GB */
> + bsr 1f
> +1:
> + lrw r14, 1b@GOTPC
> + add r14, lr
> +
> + CENABLE
> + mov r4, r2 /* save CENABLE return value */
> + lrw r1, __NR_socketcall
> + movi r2, P(SOCKOP_, socket)
> + mov r3, sp
> + trap 0
> + mov r9, r2 /* (sp,0) save r9 */
> + mov r2, r4
> + CDISABLE
> + mov r2, r9
> + ldw r15, (sp, 24)
> + .cfi_restore 15
> + ldw r14, (sp, 28)
> + .cfi_restore 14
> + ldw r9, (sp, 32)
> + .cfi_restore 9
> + addi sp, 32
> + addi sp, 8
> + .cfi_def_cfa_offset 0
> + btsti r2, 31
> + bf 3f
> +#ifdef __PIC__
> + subi sp, 8
> + .cfi_def_cfa_offset 8
> + stw gb, (sp, 0)
> + .cfi_offset 14, -8
> + stw r15, (sp, 4)
> + .cfi_offset 15, -4
> + bsr .Lgetpc
> +.Lgetpc:
> + lrw gb, .Lgetpc@GOTPC
> + addu gb, r15
> + lrw r7, SYSCALL_ERROR@GOTOFF
> + addu r7, gb
> + jsr r7
> + ldw gb, (sp, 0)
> + ldw r15, (sp, 4)
> + addi sp, 8
> + .cfi_def_cfa_offset 0
> +#else
> + jmpi SYSCALL_ERROR
> +#endif
> +
> +3:
> + rts
> +#endif
> +
> +PSEUDO_END (__socket)
> +
> +libc_hidden_def (__socket)
> +#ifndef NO_WEAK_ALIAS
> +weak_alias (__socket, socket)
> +#endif
> +
> +#endif /* __CSKYABIV2__*/
Same comment for abiv2_socket.S applies here.
> diff --git a/sysdeps/unix/sysv/linux/csky/syscall.S b/sysdeps/unix/sysv/linux/csky/syscall.S
> new file mode 100644
> index 0000000..9b700a3
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/syscall.S
> @@ -0,0 +1,61 @@
> +/* Copyright (C) 2018 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/>. */
> +
> +#ifdef __CSKYABIV2__
> +# include "abiv2_syscall.S"
> +#else
> +
> +# include <sysdep.h>
> +
> +ENTRY (syscall)
> + mov r1, r2 /* syscall num */
> +
> + mov r2, r3 /* arg1 */
> + mov r3, r4 /* arg2 */
> + mov r4, r5 /* arg3 */
> + mov r5, r6 /* arg4*/
> + mov r6, r7 /* arg5*/
> + ld r7, (sp, 0) /* arg6 */
> + trap 0
> + lrw r3, 0xfffff000
> + cmphs r2, r3
> + bt do_syscall_error
> + rts
> +PSEUDO_END (syscall)
> +
> +do_syscall_error:
> +# ifdef __PIC__
> + subi sp, 8
> + stw gb, (sp, 0)
> + stw r15, (sp, 4)
> + bsr .Lgetpc
> +.Lgetpc:
> + lrw gb, .Lgetpc@GOTPC
> + addu gb, r15
> + lrw r7, __syscall_error@PLT
> + addu r7, gb
> + ldw r7, (r7)
> + jsr r7
> + ldw gb, (sp, 0)
> + ldw r15, (sp, 4)
> + addi sp, 8
> +# else
> + jmpi __syscall_error
> +# endif /* __PIC__ */
> + rts
> +
> +#endif /* __CSKYABVI2__ */
> diff --git a/sysdeps/unix/sysv/linux/csky/syscalls.list b/sysdeps/unix/sysv/linux/csky/syscalls.list
> new file mode 100644
> index 0000000..53cff69
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/syscalls.list
> @@ -0,0 +1,7 @@
> +# File name Caller Syscall name Args Strong name Weak names
> +
> +chown - chown32 i:sii __chown chown
> +cacheflush - cacheflush i:pii _flush_cache cacheflush
> +
> +prlimit64 EXTRA prlimit64 i:iipp prlimit64
> +fanotify_mark EXTRA fanotify_mark i:iiiiis fanotify_mark
> diff --git a/sysdeps/unix/sysv/linux/csky/versionsort64.c b/sysdeps/unix/sysv/linux/csky/versionsort64.c
> new file mode 100644
> index 0000000..144b691
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/versionsort64.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/versionsort64.c>
> diff --git a/sysdeps/unix/sysv/linux/csky/vfork.S b/sysdeps/unix/sysv/linux/csky/vfork.S
> new file mode 100644
> index 0000000..913ca00
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/vfork.S
> @@ -0,0 +1,49 @@
> +/* Copyright (C) 2018 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/>. */
> +
> +#ifdef __CSKYABIV2__
> +# include "abiv2_vfork.S"
> +#else
> +
> +# 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)
> +# ifdef SAVE_PID
> + SAVE_PID
> +# endif
> + lrw r1, __NR_vfork
> + trap 0
> +# ifdef RESTORE_PID
> + RESTORE_PID
> +# endif
> + PSEUDO_RET
> + rts
> +
> +PSEUDO_END (__vfork)
> +libc_hidden_def (__vfork)
> +
> +weak_alias (__vfork, vfork)
> +strong_alias (__vfork, __libc_vfork)
> +
> +#endif /* __CSKYABIV2__*/
> diff --git a/sysdeps/unix/sysv/linux/csky/xstat.c b/sysdeps/unix/sysv/linux/csky/xstat.c
> new file mode 100644
> index 0000000..e9869f5
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/csky/xstat.c
> @@ -0,0 +1 @@
> +#include <sysdeps/unix/sysv/linux/i386/xstat.c>
>