diff options
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-sysdep.c | 44 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/brk.c | 49 |
2 files changed, 93 insertions, 0 deletions
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) + |