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* sysdeps/unix/sysv/linux/m68k/vfork.S: Optimize for kernels which
are known to have the vfork syscall. * sysdeps/m68k/sysdep.h (JUMPTARGET): Undefine before defining it. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_MMAP2_SYSCALL, __ASSUME_TRUNCATE64_SYSCALL) (__ASSUME_STAT64_SYSCALL, __ASSUME_FCNTL64) (__ASSUME_VFORK_SYSCALL): Define for m68k kernels >= 2.4.12.
This commit is contained in:
Andreas Schwab
parent
b2222ac61c
commit
c2918f01e1
12
ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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2003-01-10 Andreas Schwab <schwab@suse.de>
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* sysdeps/unix/sysv/linux/m68k/vfork.S: Optimize for kernels which
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are known to have the vfork syscall.
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* sysdeps/m68k/sysdep.h (JUMPTARGET): Undefine before defining it.
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* sysdeps/unix/sysv/linux/kernel-features.h
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(__ASSUME_MMAP2_SYSCALL, __ASSUME_TRUNCATE64_SYSCALL)
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(__ASSUME_STAT64_SYSCALL, __ASSUME_FCNTL64)
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(__ASSUME_VFORK_SYSCALL): Define for m68k kernels >= 2.4.12.
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2003-01-09 Jakub Jelinek <jakub@redhat.com>
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* posix/test-vfork.c (noop): Add __attribute_noinline__.
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79
linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S
Normal file
79
linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S
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@ -0,0 +1,79 @@
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/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@gnu.org>.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep-cancel.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <kernel-features.h>
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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#ifdef __NR_vfork
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SINGLE_THREAD_P
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jbne HIDDEN_JUMPTARGET (__fork)
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/* Pop the return PC value into A0. */
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movel %sp@+, %a0
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/* Stuff the syscall number in D0 and trap into the kernel. */
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movel #SYS_ify (vfork), %d0
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trap #0
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tstl %d0
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jmi .Lerror /* Branch forward if it failed. */
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/* Jump to the return PC. */
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jmp %a0@
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.Lerror:
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/* Push back the return PC. */
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movel %a0,%sp@-
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# ifdef __ASSUME_VFORK_SYSCALL
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# ifndef PIC
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jbra SYSCALL_ERROR_LABEL
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# endif
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# else
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/* Check if vfork syscall is known at all. */
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movel #-ENOSYS,%d1
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cmpl %d0,%d1
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jne SYSCALL_ERROR_LABEL
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# endif
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#endif
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#ifndef __ASSUME_VFORK_SYSCALL
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/* If we don't have vfork, fork is close enough. */
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movel #SYS_ify (fork), %d0
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trap #0
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tstl %d0
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jmi SYSCALL_ERROR_LABEL
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rts
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#endif
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PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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@ -1,5 +1,5 @@
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/* Assembler macros for m68k.
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Copyright (C) 1998 Free Software Foundation, Inc.
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Copyright (C) 1998, 2003 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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@ -23,25 +23,25 @@
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/* Syntactic details of assembler. */
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#ifdef HAVE_ELF
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# ifdef HAVE_ELF
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/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
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#define ALIGNARG(log2) 1<<log2
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# define ALIGNARG(log2) 1<<log2
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/* For ELF we need the `.type' directive to make shared libs work right. */
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#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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# define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
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# define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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/* In ELF C symbols are asm symbols. */
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#undef NO_UNDERSCORES
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#define NO_UNDERSCORES
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# undef NO_UNDERSCORES
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# define NO_UNDERSCORES
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#else
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# else
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#define ALIGNARG(log2) log2
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#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
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#define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */
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# define ALIGNARG(log2) log2
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# define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
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# define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */
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#endif
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# endif
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/* Define an entry point visible from C.
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@ -49,51 +49,52 @@
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There is currently a bug in gdb which prevents us from specifying
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incomplete stabs information. Fake some entries here which specify
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the current source file. */
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#define ENTRY(name) \
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# define ENTRY(name) \
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.globl C_SYMBOL_NAME(name); \
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ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function); \
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.align ALIGNARG(2); \
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C_LABEL(name) \
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CALL_MCOUNT
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#undef END
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#define END(name) ASM_SIZE_DIRECTIVE(name)
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# undef END
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# define END(name) ASM_SIZE_DIRECTIVE(name)
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/* If compiled for profiling, call `_mcount' at the start of each function. */
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#ifdef PROF
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# ifdef PROF
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/* The mcount code relies on a normal frame pointer being on the stack
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to locate our caller, so push one just for its benefit. */
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#define CALL_MCOUNT \
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# define CALL_MCOUNT \
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move.l %fp, -(%sp); move.l %sp, %fp; \
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jbsr JUMPTARGET (mcount); \
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move.l (%sp)+, %fp;
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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# else
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# define CALL_MCOUNT /* Do nothing. */
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# endif
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#ifdef NO_UNDERSCORES
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# ifdef NO_UNDERSCORES
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/* Since C identifiers are not normally prefixed with an underscore
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on this system, the asm identifier `syscall_error' intrudes on the
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C name space. Make sure we use an innocuous name. */
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#define syscall_error __syscall_error
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#define mcount _mcount
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#endif
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# define syscall_error __syscall_error
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# define mcount _mcount
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# endif
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#define PSEUDO(name, syscall_name, args) \
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# define PSEUDO(name, syscall_name, args) \
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.globl syscall_error; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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jcc JUMPTARGET(syscall_error)
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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# undef PSEUDO_END
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# define PSEUDO_END(name) \
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END (name)
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#ifdef PIC
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#define JUMPTARGET(name) name##@PLTPC
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#else
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#define JUMPTARGET(name) name
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#endif
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# undef JUMPTARGET
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# ifdef PIC
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# define JUMPTARGET(name) name##@PLTPC
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# else
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# define JUMPTARGET(name) name
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# endif
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#endif /* __ASSEMBLER__ */
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@ -240,3 +240,12 @@
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#if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
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# define __ASSUME_CLONE_THREAD_FLAGS 1
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#endif
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/* These features were surely available with 2.4.12. */
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#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
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# define __ASSUME_MMAP2_SYSCALL 1
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# define __ASSUME_TRUNCATE64_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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# define __ASSUME_FCNTL64 1
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# define __ASSUME_VFORK_SYSCALL 1
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#endif
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