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galileo: Implement _sbrk_r syscall

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This patch implements the _sbrk_r() system call for Galileo platform. This
system call is required by newlib's malloc() implementation. Next patch
will introduce the initial support for stdio library which requires a
working malloc() function for proper operation.

We are not sure about the heap size we should use. Preliminary tests
have shown that stdio library requests 1032 bytes heap. So, as an initial
guess, a 2Kb heap size should be enough for now.
This commit is contained in:
Andre Guedes 2015-07-17 10:21:31 -03:00 committed by Jesus Sanchez-Palencia
parent 15f947fe40
commit ee82304211
1 changed files with 20 additions and 3 deletions
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23
platform/galileo/newlib-syscalls.c
View file

@ -31,6 +31,11 @@
#include <sys/stat.h>
#include <errno.h>
#define HEAP_MAX_SIZE 2048
static char _heap[HEAP_MAX_SIZE];
static char *prog_break = _heap;
int
_close_r(struct _reent *ptr, int file)
{
@ -81,9 +86,21 @@ _fstat_r(struct _reent *ptr, int file, struct stat *st)
caddr_t
_sbrk_r(struct _reent *ptr, int incr)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return NULL;
char *prev_prog_break;
/* If the new program break overruns the maximum heap address, we return
* "Out of Memory" error to the user.
*/
if(prog_break + incr > _heap + HEAP_MAX_SIZE) {
ptr->_errno = ENOMEM;
return NULL;
}
prev_prog_break = prog_break;
prog_break += incr;
return prev_prog_break;
}
/*---------------------------------------------------------------------------*/
void