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2002-12-18 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/sysdep.h: Define ENTER_KERNEL macro. Use it instead of directly int $0x80. * sysdeps/unix/sysv/linux/i386/brk.c: Use ENTER_KERNEL. * sysdeps/unix/sysv/linux/i386/mmap64.S: Likewise. * sysdeps/unix/sysv/linux/i386/mmap.S: Likewise. * sysdeps/unix/sysv/linux/i386/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/i386/socket.S: Likewise. * sysdeps/unix/sysv/linux/i386/syscall.S: Likewise.
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* brk system call for Linux/i386.
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Copyright (C) 1995, 1996, 2000, 2002 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, 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 <errno.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include <bp-checks.h>
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/* This must be initialized data because commons can't have aliases. */
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void *__curbrk = 0;
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/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
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to work around different old braindamage in the old Linux ELF dynamic
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linker. */
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weak_alias (__curbrk, ___brk_addr)
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int
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__brk (void *addr)
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{
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void *__unbounded newbrk, *__unbounded scratch;
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asm ("movl %%ebx, %1\n\t" /* Save %ebx in scratch register. */
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"movl %3, %%ebx\n\t" /* Put ADDR in %ebx to be syscall arg. */
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ENTER_KERNEL "\n\t" /* Perform the system call. */
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"movl %1, %%ebx" /* Restore %ebx from scratch register. */
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: "=a" (newbrk), "=r" (scratch)
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: "0" (SYS_ify (brk)), "g" (__ptrvalue (addr)));
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__curbrk = newbrk;
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if (newbrk < addr)
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{
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__set_errno (ENOMEM);
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return -1;
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}
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return 0;
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}
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weak_alias (__brk, brk)
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