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RISC-V: Linux Syscall Interface
Contains the Linux system call interface, as well as the definitions of
a handful of system calls.
2018-01-29 Palmer Dabbelt <palmer@sifive.com>
* sysdeps/riscv/nptl/nptl-sysdep.S: New file.
* sysdeps/unix/sysv/linux/riscv/arch-fork.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/clone.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/profil-counter.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/pt-vfork.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/syscall.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/sysdep.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/sysdep.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/vfork.S: Likewise.
This commit is contained in:
Palmer Dabbelt
parent
d1c09b2471
commit
36960f0c76
@ -96,6 +96,15 @@
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* sysdeps/riscv/nptl/bits/semaphore.h: Likewise.
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* sysdeps/riscv/nptl/libc-lowlevellock.c: Likewise.
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* sysdeps/unix/sysv/linux/riscv/atomic-machine.h: Likewise.
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* sysdeps/riscv/nptl/nptl-sysdep.S: New file.
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* sysdeps/unix/sysv/linux/riscv/arch-fork.h: Likewise.
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* sysdeps/unix/sysv/linux/riscv/clone.S: Likewise.
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* sysdeps/unix/sysv/linux/riscv/profil-counter.h: Likewise.
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* sysdeps/unix/sysv/linux/riscv/pt-vfork.S: Likewise.
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* sysdeps/unix/sysv/linux/riscv/syscall.c: Likewise.
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* sysdeps/unix/sysv/linux/riscv/sysdep.S: Likewise.
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* sysdeps/unix/sysv/linux/riscv/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/riscv/vfork.S: Likewise.
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2018-01-29 Florian Weimer <fweimer@redhat.com>
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2
sysdeps/riscv/nptl/nptl-sysdep.S
Normal file
2
sysdeps/riscv/nptl/nptl-sysdep.S
Normal file
@ -0,0 +1,2 @@
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/* Pull in __syscall_error. */
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#include <sysdep.S>
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26
sysdeps/unix/sysv/linux/riscv/arch-fork.h
Normal file
26
sysdeps/unix/sysv/linux/riscv/arch-fork.h
Normal file
@ -0,0 +1,26 @@
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/* Internal definitions for thread-friendly fork implementation. Linux/RISC-V.
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Copyright (C) 2002-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sched.h>
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#include <sysdep.h>
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#include <tls.h>
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#define ARCH_FORK() \
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INLINE_SYSCALL (clone, 5, \
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CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | SIGCHLD, 0, \
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NULL, NULL, &THREAD_SELF->tid)
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86
sysdeps/unix/sysv/linux/riscv/clone.S
Normal file
86
sysdeps/unix/sysv/linux/riscv/clone.S
Normal file
@ -0,0 +1,86 @@
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/* Wrapper around clone system call. RISC-V version.
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Copyright (C) 1996-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sys/asm.h>
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <tls.h>
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#include "tcb-offsets.h"
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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void *parent_tidptr, void *tls, void *child_tidptr) */
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.text
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LEAF (__clone)
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/* Sanity check arguments. */
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beqz a0,L (invalid) /* No NULL function pointers. */
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beqz a1,L (invalid) /* No NULL stack pointers. */
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addi a1,a1,-16 /* Reserve argument save space. */
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REG_S a0,0(a1) /* Save function pointer. */
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REG_S a3,SZREG(a1) /* Save argument pointer. */
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/* The syscall expects the args to be in different slots. */
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mv a0,a2
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mv a2,a4
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mv a3,a5
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mv a4,a6
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/* Do the system call. */
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li a7,__NR_clone
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scall
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bltz a0,L (error)
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beqz a0,L (thread_start)
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/* Successful return from the parent. */
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ret
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L (invalid):
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li a0, -EINVAL
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/* Something bad happened -- no child created. */
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L (error):
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j __syscall_error
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END (__clone)
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/* Load up the arguments to the function. Put this block of code in
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its own function so that we can terminate the stack trace with our
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debug info. */
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ENTRY (__thread_start)
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L (thread_start):
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/* Restore the arg for user's function. */
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REG_L a1,0(sp) /* Function pointer. */
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REG_L a0,SZREG(sp) /* Argument pointer. */
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/* Call the user's function. */
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jalr a1
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/* Call exit with the function's return value. */
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li a7, __NR_exit
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scall
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END (__thread_start)
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libc_hidden_def (__clone)
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weak_alias (__clone, clone)
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31
sysdeps/unix/sysv/linux/riscv/profil-counter.h
Normal file
31
sysdeps/unix/sysv/linux/riscv/profil-counter.h
Normal file
@ -0,0 +1,31 @@
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/* Low-level statistical profiling support function. Linux/RISC-V version.
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Copyright (C) 1996-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
|
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The GNU C Library is distributed in the hope that it will be useful,
|
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <sigcontextinfo.h>
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static void
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__profil_counter (int signo, const SIGCONTEXT scp)
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{
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profil_count ((void *) GET_PC (scp));
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/* This is a hack to prevent the compiler from implementing the
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above function call as a sibcall. The sibcall would overwrite
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the signal context. */
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asm volatile ("");
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}
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1
sysdeps/unix/sysv/linux/riscv/pt-vfork.S
Normal file
1
sysdeps/unix/sysv/linux/riscv/pt-vfork.S
Normal file
@ -0,0 +1 @@
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/* Not needed. */
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35
sysdeps/unix/sysv/linux/riscv/syscall.c
Normal file
35
sysdeps/unix/sysv/linux/riscv/syscall.c
Normal file
@ -0,0 +1,35 @@
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/* system call interface. Linux/RISC-V version.
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Copyright (C) 2001-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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long int
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syscall (long int syscall_number, long int arg1, long int arg2, long int arg3,
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long int arg4, long int arg5, long int arg6, long int arg7)
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{
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long int ret;
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INTERNAL_SYSCALL_DECL (err);
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ret = INTERNAL_SYSCALL_NCS (syscall_number, err, 7, arg1, arg2, arg3, arg4,
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arg5, arg6, arg7);
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if (INTERNAL_SYSCALL_ERROR_P (ret, err))
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return __syscall_error (ret);
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return ret;
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}
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51
sysdeps/unix/sysv/linux/riscv/sysdep.S
Normal file
51
sysdeps/unix/sysv/linux/riscv/sysdep.S
Normal file
@ -0,0 +1,51 @@
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/* syscall error handlers
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Copyright (C) 2011-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
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|
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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Lesser General Public License for more details.
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|
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You should have received a copy of the GNU Lesser General Public
|
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#if IS_IN (libc)
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# define errno __libc_errno
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#endif
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ENTRY (__syscall_error)
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mv t0, ra
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/* Fall through to __syscall_set_errno. */
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END (__syscall_error)
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/* Non-standard calling convention: argument in a0, return address in t0,
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and clobber only t1. */
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ENTRY (__syscall_set_errno)
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/* We got here because a0 < 0, but only codes in the range [-4095, -1]
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represent errors. Otherwise, just return the result normally. */
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li t1, -4096
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bleu a0, t1, 1f
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neg a0, a0
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#if RTLD_PRIVATE_ERRNO
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sw a0, rtld_errno, t1
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#elif defined(__PIC__)
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la.tls.ie t1, errno
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add t1, t1, tp
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sw a0, 0(t1)
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#else
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lui t1, %tprel_hi(errno)
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add t1, t1, tp, %tprel_add(errno)
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sw a0, %tprel_lo(errno)(t1)
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#endif
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li a0, -1
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1: jr t0
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END (__syscall_set_errno)
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325
sysdeps/unix/sysv/linux/riscv/sysdep.h
Normal file
325
sysdeps/unix/sysv/linux/riscv/sysdep.h
Normal file
@ -0,0 +1,325 @@
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/* Assembly macros for RISC-V.
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Copyright (C) 2011-2018
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
|
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modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
|
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|
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The GNU C Library is distributed in the hope that it will be useful,
|
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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.
|
||||
|
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You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _LINUX_RISCV_SYSDEP_H
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#define _LINUX_RISCV_SYSDEP_H 1
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#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
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#include <tls.h>
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#ifdef __ASSEMBLER__
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# include <sys/asm.h>
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# define ENTRY(name) LEAF(name)
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# define L(label) .L ## label
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/* Performs a system call, handling errors by setting errno. Linux indicates
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errors by setting a0 to a value between -1 and -4095. */
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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.align 2; \
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ENTRY (name); \
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li a7, SYS_ify (syscall_name); \
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scall; \
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li a7, -4096; \
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bgtu a0, a7, .Lsyscall_error ## name;
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# undef PSEUDO_END
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# define PSEUDO_END(sym) \
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SYSCALL_ERROR_HANDLER (sym) \
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ret; \
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END (sym)
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# if !IS_IN (libc)
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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li t1, -4096; \
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neg a0, a0; \
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sw a0, rtld_errno, t1; \
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li a0, -1;
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# elif defined (__PIC__)
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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la.tls.ie t1, errno; \
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add t1, t1, tp; \
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neg a0, a0; \
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sw a0, 0(t1); \
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li a0, -1;
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# else
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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lui t1, %tprel_hi(errno); \
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add t1, t1, tp, %tprel_add(errno); \
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neg a0, a0; \
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sw a0, %tprel_lo(errno)(t1); \
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li a0, -1;
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# endif
|
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# else
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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j __syscall_error;
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# endif
|
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|
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/* Performs a system call, not setting errno. */
|
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# undef PSEUDO_NEORRNO
|
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.align 2; \
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ENTRY (name); \
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li a7, SYS_ify (syscall_name); \
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scall;
|
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|
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# undef PSEUDO_END_NOERRNO
|
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# define PSEUDO_END_NOERRNO(name) \
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END (name)
|
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|
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# undef ret_NOERRNO
|
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# define ret_NOERRNO ret
|
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|
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/* Perfroms a system call, returning the error code. */
|
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# undef PSEUDO_ERRVAL
|
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
|
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PSEUDO_NOERRNO (name, syscall_name, args) \
|
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neg a0, a0;
|
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|
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# undef PSEUDO_END_ERRVAL
|
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# define PSEUDO_END_ERRVAL(name) \
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END (name)
|
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|
||||
# undef ret_ERRVAL
|
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# 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__
|
||||
|
||||
/* List of system calls which are supported as vsyscalls. */
|
||||
# define HAVE_CLOCK_GETRES_VSYSCALL 1
|
||||
# define HAVE_CLOCK_GETTIME_VSYSCALL 1
|
||||
# define HAVE_GETTIMEOFDAY_VSYSCALL 1
|
||||
# define HAVE_GETCPU_VSYSCALL 1
|
||||
|
||||
/* Define a macro which expands into the inline wrapper code for a system
|
||||
call. */
|
||||
# undef INLINE_SYSCALL
|
||||
# define INLINE_SYSCALL(name, nr, args...) \
|
||||
({ INTERNAL_SYSCALL_DECL (err); \
|
||||
long int __sys_result = INTERNAL_SYSCALL (name, err, nr, args); \
|
||||
if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (__sys_result, ))) \
|
||||
{ \
|
||||
__set_errno (INTERNAL_SYSCALL_ERRNO (__sys_result, )); \
|
||||
__sys_result = (unsigned long) -1; \
|
||||
} \
|
||||
__sys_result; })
|
||||
|
||||
# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
|
||||
|
||||
# define INTERNAL_SYSCALL_ERROR_P(val, err) \
|
||||
((unsigned long int) (val) > -4096UL)
|
||||
|
||||
# define INTERNAL_SYSCALL_ERRNO(val, err) (-val)
|
||||
|
||||
# define INTERNAL_SYSCALL(name, err, nr, args...) \
|
||||
internal_syscall##nr (SYS_ify (name), err, args)
|
||||
|
||||
# define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
|
||||
internal_syscall##nr (number, err, args)
|
||||
|
||||
# define internal_syscall0(number, err, dummy...) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0"); \
|
||||
__asm__ volatile ( \
|
||||
"scall\n\t" \
|
||||
: "=r" (__a0) \
|
||||
: "r" (__a7) \
|
||||
: __SYSCALL_CLOBBERS); \
|
||||
_sys_result = __a0; \
|
||||
} \
|
||||
_sys_result; \
|
||||
})
|
||||
|
||||
# define internal_syscall1(number, err, arg0) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
__asm__ volatile ( \
|
||||
"scall\n\t" \
|
||||
: "+r" (__a0) \
|
||||
: "r" (__a7) \
|
||||
: __SYSCALL_CLOBBERS); \
|
||||
_sys_result = __a0; \
|
||||
} \
|
||||
_sys_result; \
|
||||
})
|
||||
|
||||
# define internal_syscall2(number, err, arg0, arg1) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
register long int __a1 asm ("a1") = (long int) (arg1); \
|
||||
__asm__ volatile ( \
|
||||
"scall\n\t" \
|
||||
: "+r" (__a0) \
|
||||
: "r" (__a7), "r" (__a1) \
|
||||
: __SYSCALL_CLOBBERS); \
|
||||
_sys_result = __a0; \
|
||||
} \
|
||||
_sys_result; \
|
||||
})
|
||||
|
||||
# define internal_syscall3(number, err, arg0, arg1, arg2) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
register long int __a1 asm ("a1") = (long int) (arg1); \
|
||||
register long int __a2 asm ("a2") = (long int) (arg2); \
|
||||
__asm__ volatile ( \
|
||||
"scall\n\t" \
|
||||
: "+r" (__a0) \
|
||||
: "r" (__a7), "r" (__a1), "r" (__a2) \
|
||||
: __SYSCALL_CLOBBERS); \
|
||||
_sys_result = __a0; \
|
||||
} \
|
||||
_sys_result; \
|
||||
})
|
||||
|
||||
# define internal_syscall4(number, err, arg0, arg1, arg2, arg3) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
register long int __a1 asm ("a1") = (long int) (arg1); \
|
||||
register long int __a2 asm ("a2") = (long int) (arg2); \
|
||||
register long int __a3 asm ("a3") = (long int) (arg3); \
|
||||
__asm__ volatile ( \
|
||||
"scall\n\t" \
|
||||
: "+r" (__a0) \
|
||||
: "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3) \
|
||||
: __SYSCALL_CLOBBERS); \
|
||||
_sys_result = __a0; \
|
||||
} \
|
||||
_sys_result; \
|
||||
})
|
||||
|
||||
# define internal_syscall5(number, err, arg0, arg1, arg2, arg3, arg4) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
register long int __a1 asm ("a1") = (long int) (arg1); \
|
||||
register long int __a2 asm ("a2") = (long int) (arg2); \
|
||||
register long int __a3 asm ("a3") = (long int) (arg3); \
|
||||
register long int __a4 asm ("a4") = (long int) (arg4); \
|
||||
__asm__ volatile ( \
|
||||
"scall\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, err, arg0, arg1, arg2, arg3, arg4, arg5) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
register long int __a1 asm ("a1") = (long int) (arg1); \
|
||||
register long int __a2 asm ("a2") = (long int) (arg2); \
|
||||
register long int __a3 asm ("a3") = (long int) (arg3); \
|
||||
register long int __a4 asm ("a4") = (long int) (arg4); \
|
||||
register long int __a5 asm ("a5") = (long int) (arg5); \
|
||||
__asm__ volatile ( \
|
||||
"scall\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, err, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
|
||||
({ \
|
||||
long int _sys_result; \
|
||||
\
|
||||
{ \
|
||||
register long int __a7 asm ("a7") = number; \
|
||||
register long int __a0 asm ("a0") = (long int) (arg0); \
|
||||
register long int __a1 asm ("a1") = (long int) (arg1); \
|
||||
register long int __a2 asm ("a2") = (long int) (arg2); \
|
||||
register long int __a3 asm ("a3") = (long int) (arg3); \
|
||||
register long int __a4 asm ("a4") = (long int) (arg4); \
|
||||
register long int __a5 asm ("a5") = (long int) (arg5); \
|
||||
register long int __a6 asm ("a6") = (long int) (arg6); \
|
||||
__asm__ volatile ( \
|
||||
"scall\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 "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/riscv/sysdep.h */
|
||||
44
sysdeps/unix/sysv/linux/riscv/vfork.S
Normal file
44
sysdeps/unix/sysv/linux/riscv/vfork.S
Normal file
@ -0,0 +1,44 @@
|
||||
/* vfork for Linux, RISC-V version.
|
||||
Copyright (C) 2005-2018 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/>. */
|
||||
|
||||
/* vfork() is just a special case of clone(). */
|
||||
|
||||
#include <sys/asm.h>
|
||||
#include <sysdep.h>
|
||||
#define __ASSEMBLY__
|
||||
#include <linux/sched.h>
|
||||
#include <asm/signal.h>
|
||||
|
||||
.text
|
||||
LEAF (__libc_vfork)
|
||||
|
||||
li a0, (CLONE_VFORK | CLONE_VM | SIGCHLD)
|
||||
mv a1, sp
|
||||
|
||||
li a7, __NR_clone
|
||||
scall
|
||||
|
||||
bltz a0, 1f
|
||||
ret
|
||||
|
||||
1: j __syscall_error
|
||||
END (__libc_vfork)
|
||||
|
||||
weak_alias (__libc_vfork, vfork)
|
||||
strong_alias (__libc_vfork, __vfork)
|
||||
libc_hidden_def (__vfork)
|
||||
Loading…
x
Reference in New Issue
Block a user