diff options
| -rw-r--r-- | ChangeLog | 12 | ||||
| -rw-r--r-- | linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S | 79 | ||||
| -rw-r--r-- | sysdeps/m68k/sysdep.h | 65 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/kernel-features.h | 9 |
4 files changed, 133 insertions, 32 deletions
@@ -1,3 +1,15 @@ +2003-01-10 Andreas Schwab <schwab@suse.de> + + * 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. + 2003-01-09 Jakub Jelinek <jakub@redhat.com> * posix/test-vfork.c (noop): Add __attribute_noinline__. diff --git a/linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S b/linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S new file mode 100644 index 0000000..ba25cb1 --- /dev/null +++ b/linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S @@ -0,0 +1,79 @@ +/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab <schwab@gnu.org>. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep-cancel.h> +#define _ERRNO_H 1 +#include <bits/errno.h> +#include <kernel-features.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 __NR_vfork + + SINGLE_THREAD_P + jbne HIDDEN_JUMPTARGET (__fork) + + /* Pop the return PC value into A0. */ + movel %sp@+, %a0 + + /* Stuff the syscall number in D0 and trap into the kernel. */ + movel #SYS_ify (vfork), %d0 + trap #0 + tstl %d0 + jmi .Lerror /* Branch forward if it failed. */ + + /* Jump to the return PC. */ + jmp %a0@ + +.Lerror: + /* Push back the return PC. */ + movel %a0,%sp@- + +# ifdef __ASSUME_VFORK_SYSCALL +# ifndef PIC + jbra SYSCALL_ERROR_LABEL +# endif +# else + /* Check if vfork syscall is known at all. */ + movel #-ENOSYS,%d1 + cmpl %d0,%d1 + jne SYSCALL_ERROR_LABEL + +# endif +#endif + +#ifndef __ASSUME_VFORK_SYSCALL + /* If we don't have vfork, fork is close enough. */ + + movel #SYS_ify (fork), %d0 + trap #0 + tstl %d0 + jmi SYSCALL_ERROR_LABEL + rts +#endif + +PSEUDO_END (__vfork) +libc_hidden_def (__vfork) + +weak_alias (__vfork, vfork) diff --git a/sysdeps/m68k/sysdep.h b/sysdeps/m68k/sysdep.h index 554b92d..f492ff6 100644 --- a/sysdeps/m68k/sysdep.h +++ b/sysdeps/m68k/sysdep.h @@ -1,5 +1,5 @@ /* Assembler macros for m68k. - Copyright (C) 1998 Free Software Foundation, Inc. + Copyright (C) 1998, 2003 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 @@ -23,25 +23,25 @@ /* Syntactic details of assembler. */ -#ifdef HAVE_ELF +# ifdef HAVE_ELF /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ -#define ALIGNARG(log2) 1<<log2 +# define ALIGNARG(log2) 1<<log2 /* For ELF we need the `.type' directive to make shared libs work right. */ -#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg -#define ASM_SIZE_DIRECTIVE(name) .size name,.-name +# define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg +# define ASM_SIZE_DIRECTIVE(name) .size name,.-name /* In ELF C symbols are asm symbols. */ -#undef NO_UNDERSCORES -#define NO_UNDERSCORES +# undef NO_UNDERSCORES +# define NO_UNDERSCORES -#else +# else -#define ALIGNARG(log2) log2 -#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */ -#define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */ +# define ALIGNARG(log2) log2 +# define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */ +# define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */ -#endif +# endif /* Define an entry point visible from C. @@ -49,51 +49,52 @@ There is currently a bug in gdb which prevents us from specifying incomplete stabs information. Fake some entries here which specify the current source file. */ -#define ENTRY(name) \ +# define ENTRY(name) \ .globl C_SYMBOL_NAME(name); \ ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function); \ .align ALIGNARG(2); \ C_LABEL(name) \ CALL_MCOUNT -#undef END -#define END(name) ASM_SIZE_DIRECTIVE(name) +# undef END +# define END(name) ASM_SIZE_DIRECTIVE(name) /* If compiled for profiling, call `_mcount' at the start of each function. */ -#ifdef PROF +# ifdef PROF /* The mcount code relies on a normal frame pointer being on the stack to locate our caller, so push one just for its benefit. */ -#define CALL_MCOUNT \ +# define CALL_MCOUNT \ move.l %fp, -(%sp); move.l %sp, %fp; \ jbsr JUMPTARGET (mcount); \ move.l (%sp)+, %fp; -#else -#define CALL_MCOUNT /* Do nothing. */ -#endif +# else +# define CALL_MCOUNT /* Do nothing. */ +# endif -#ifdef NO_UNDERSCORES +# ifdef NO_UNDERSCORES /* Since C identifiers are not normally prefixed with an underscore on this system, the asm identifier `syscall_error' intrudes on the C name space. Make sure we use an innocuous name. */ -#define syscall_error __syscall_error -#define mcount _mcount -#endif +# define syscall_error __syscall_error +# define mcount _mcount +# endif -#define PSEUDO(name, syscall_name, args) \ +# define PSEUDO(name, syscall_name, args) \ .globl syscall_error; \ ENTRY (name) \ DO_CALL (syscall_name, args); \ jcc JUMPTARGET(syscall_error) -#undef PSEUDO_END -#define PSEUDO_END(name) \ +# undef PSEUDO_END +# define PSEUDO_END(name) \ END (name) -#ifdef PIC -#define JUMPTARGET(name) name##@PLTPC -#else -#define JUMPTARGET(name) name -#endif +# undef JUMPTARGET +# ifdef PIC +# define JUMPTARGET(name) name##@PLTPC +# else +# define JUMPTARGET(name) name +# endif #endif /* __ASSEMBLER__ */ diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index c93ab35..6b1bdf2 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -240,3 +240,12 @@ #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__ # define __ASSUME_CLONE_THREAD_FLAGS 1 #endif + +/* These features were surely available with 2.4.12. */ +#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__ +# define __ASSUME_MMAP2_SYSCALL 1 +# define __ASSUME_TRUNCATE64_SYSCALL 1 +# define __ASSUME_STAT64_SYSCALL 1 +# define __ASSUME_FCNTL64 1 +# define __ASSUME_VFORK_SYSCALL 1 +#endif |