diff options
| -rw-r--r-- | ChangeLog | 9 | ||||
| -rw-r--r-- | sysdeps/generic/sbrk.c | 20 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/brk.c | 23 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-sysdep.c | 44 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/brk.c | 49 |
5 files changed, 128 insertions, 17 deletions
@@ -1,7 +1,14 @@ Sat Dec 2 03:47:27 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> - * sysdeps/unix/sysv/linux/i386/sbrk.S: File removed. + * sysdeps/mach/hurd/brk.c (DATA_SIZE): Bump to 128MB. + (_hurd_set_brk): Try to allocate more space when we run out. + * sysdeps/generic/sbrk.c: If __curbrk is zero, call __brk with + zero and examine it again. + * sysdeps/unix/sysv/linux/i386/brk.c: New file. + * sysdeps/unix/sysv/linux/i386/brk.S: File removed. + * sysdeps/unix/sysv/linux/i386/sbrk.S: File removed. + * sysdeps/unix/sysv/linux/dl-sysdep.c: New file. * sysdeps/generic/dl-sysdep.c (_dl_sysdep_start) [DL_SYSDEP_INIT]: Invoke this macro before calling DL_MAIN. diff --git a/sysdeps/generic/sbrk.c b/sysdeps/generic/sbrk.c index 28beab62d5..83e2536d5d 100644 --- a/sysdeps/generic/sbrk.c +++ b/sysdeps/generic/sbrk.c @@ -15,26 +15,30 @@ You should have received a copy of the GNU General Public License along with the GNU C Library; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <ansidecl.h> +#include <unistd.h> +#include <errno.h> /* Defined in brk.c. */ -extern PTR __curbrk; -extern int EXFUN(__brk, (PTR addr)); +extern void *__curbrk; +extern int __brk (void *addr); /* Extend the process's data space by INCREMENT. If INCREMENT is negative, shrink data space by - INCREMENT. Return start of new space allocated, or -1 for errors. */ -PTR -DEFUN(__sbrk, (increment), int increment) +void * +__sbrk (int increment) { - char *oldbrk; + void *oldbrk; + + if (__curbrk == 0 && __brk (0) < 0) + return (void *) -1; if (increment == 0) return __curbrk; oldbrk = __curbrk; - if (__brk(oldbrk + increment) < 0) - return (PTR) -1; + if (__brk (oldbrk + increment) < 0) + return (void *) -1; return oldbrk; } diff --git a/sysdeps/mach/hurd/brk.c b/sysdeps/mach/hurd/brk.c index a96286b2d9..49b370a0e3 100644 --- a/sysdeps/mach/hurd/brk.c +++ b/sysdeps/mach/hurd/brk.c @@ -23,8 +23,8 @@ Cambridge, MA 02139, USA. */ #include <cthreads.h> /* For `struct mutex'. */ -/* Initial maximum size of the data segment (32MB, which is arbitrary). */ -#define DATA_SIZE (32 * 1024 * 1024) +/* Initial maximum size of the data segment (this is arbitrary). */ +#define DATA_SIZE (128 * 1024 * 1024) /* Up to the page including this address is allocated from the kernel. @@ -85,13 +85,20 @@ _hurd_set_brk (vm_address_t addr) return -1; } - /* Make the memory accessible. */ - if (err = __vm_protect (__mach_task_self (), pagebrk, pagend - pagebrk, - 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)) + if (pagend > _hurd_data_end) { - errno = err; - return -1; + /* We didn't allocate enough space! Hopefully we can get some more! */ + err = __vm_allocate (__mach_task_self (), &pagebrk, pagend - pagebrk, 0); + if (! err) + _hurd_data_end = pagend; } + else + /* Make the memory accessible. */ + err = __vm_protect (__mach_task_self (), pagebrk, pagend - pagebrk, + 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); + + if (err) + return __hurd_fail (err); _hurd_brk = addr; return 0; @@ -112,7 +119,7 @@ init_brk (void) pagend = round_page (_hurd_brk); - _hurd_data_end = (vm_address_t) &__data_start + DATA_SIZE; + _hurd_data_end = round_page ((vm_address_t) &__data_start + DATA_SIZE); if (pagend < _hurd_data_end) { diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/linux/dl-sysdep.c new file mode 100644 index 0000000000..94e1879f2d --- /dev/null +++ b/sysdeps/unix/sysv/linux/dl-sysdep.c @@ -0,0 +1,44 @@ +/* Dynamic linker system dependencies for Linux. +Copyright (C) 1995 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* Linux needs some special initialization, but otherwise uses + the generic dynamic linker system interface code. */ + +#include <unistd.h> + +#define DL_SYSDEP_INIT frob_brk () + +static inline void +frob_brk (void) +{ + extern void _end; + __brk (0); /* Initialize the break. */ + if (__sbrk (0) == &_end) + { + /* The dynamic linker was run as a program, and so the initial break + starts just after our bss, at &_end. The malloc in dl-minimal.c + will consume the rest of this page, so tell the kernel to move the + break up that far. When the user program examines its break, it + will see this new value and not clobber our data. */ + size_t pg = __getpagesize (); + __sbrk (pg - ((&_end - (void *) 0) & pg)); + } +} + +#include <sysdeps/generic/dl-sysdep.c> diff --git a/sysdeps/unix/sysv/linux/i386/brk.c b/sysdeps/unix/sysv/linux/i386/brk.c new file mode 100644 index 0000000000..9963e0777b --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/brk.c @@ -0,0 +1,49 @@ +/* brk system call for Linux/i386. +Copyright (C) 1995 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <errno.h> +#include <unistd.h> +#include <sysdep.h> + +void *__curbrk; + +int +__brk (void *addr) +{ + void *newbrk, *scratch; + + asm ("movl %%ebx, %1\n" /* Save %ebx in scratch register. */ + "movl %3, %%ebx\n" /* Put ADDR in %ebx to be syscall arg. */ + "int $0x80 # %2\n" /* Perform the system call. */ + "movl %1, %%ebx\n" /* Restore %ebx from scratch register. */ + : "=a" (newbrk), "=r" (scratch) + : "0" (SYS_ify (brk)), "g" (addr)); + + __curbrk = newbrk; + + if (newbrk < addr) + { + errno = ENOMEM; + return -1; + } + + return 0; +} +weak_alias (__brk, brk) + |