diff options
Diffstat (limited to 'libgloss/arc/sbrk.c')
-rw-r--r-- | libgloss/arc/sbrk.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/libgloss/arc/sbrk.c b/libgloss/arc/sbrk.c new file mode 100644 index 000000000..8cb8461dd --- /dev/null +++ b/libgloss/arc/sbrk.c @@ -0,0 +1,61 @@ +/* + Copyright (c) 2015, Synopsys, Inc. All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + 1) Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + + 2) Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3) Neither the name of the Synopsys, Inc., nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. +*/ + +#include <sys/types.h> +#include <sys/errno.h> + +extern char __start_heap; +extern char __end_heap; + +caddr_t +_sbrk (size_t nbytes) +{ + static char* heap_ptr = NULL; + char* prev_heap_ptr; + + if (heap_ptr == NULL) + { + heap_ptr = &__start_heap; + } + + /* Align the 'heap_ptr' so that memory will always be allocated at word + boundaries. */ + heap_ptr = (char *) ((((unsigned long) heap_ptr) + 7) & ~7); + prev_heap_ptr = heap_ptr; + + if ((heap_ptr + nbytes) < &__end_heap) + { + heap_ptr += nbytes; + return (caddr_t) prev_heap_ptr; + } + + errno = ENOMEM; + return (caddr_t) -1; +} |