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authorRoland McGrath <roland@gnu.org>1995-12-03 10:00:22 +0000
committerRoland McGrath <roland@gnu.org>1995-12-03 10:00:22 +0000
commit683158e0c42dc68e3c43a32b6e5d832c5280e94e (patch)
treea760f36d0950bcd7be070a6424349341ee179f5a /sysdeps
parent0fe4e552917483253b68ac9800b8bd292bf3a51d (diff)
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* sysdeps/mach/hurd/brk.c (DATA_SIZE): Bump to 128MB.cvs/libc-951204cvs/libc-951203
(_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.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/sbrk.c20
-rw-r--r--sysdeps/mach/hurd/brk.c23
-rw-r--r--sysdeps/unix/sysv/linux/dl-sysdep.c44
-rw-r--r--sysdeps/unix/sysv/linux/i386/brk.c49
4 files changed, 120 insertions, 16 deletions
diff --git a/sysdeps/generic/sbrk.c b/sysdeps/generic/sbrk.c
index 28beab6..83e2536 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 a96286b..49b370a 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 0000000..94e1879
--- /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 0000000..9963e07
--- /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)
+