ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Fix function to get sp when in unprivileged mode

Alessandro Angelino 2016-04-06 16:14:19 +01:00 committed by Milosch Meriac
parent 4ae6b059e0
commit 3ad0f0a430
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
hal/common/retarget.cpp
View File

@ -469,8 +469,16 @@ extern "C" uint32_t __HeapLimit;
#undef errno
extern "C" int errno;
// For ARM7 only
register unsigned char * stack_ptr __asm ("sp");
// Stack pointer handling
#ifdef __ICCARM__
#define __current_sp() __get_SP()
#else
static inline unsigned int __current_sp(void)
{
register unsigned sp asm("sp");
return sp;
}
#endif /* __ICCARM__ */
// Dynamic memory allocation related syscall.
extern "C" caddr_t _sbrk(int incr) {
@ -478,12 +486,10 @@ extern "C" caddr_t _sbrk(int incr) {
unsigned char* prev_heap = heap;
unsigned char* new_heap = heap + incr;
#if defined(TARGET_ARM7)
if (new_heap >= stack_ptr) {
#elif defined(TARGET_CORTEX_A)
#if defined(TARGET_CORTEX_A)
if (new_heap >= (unsigned char*)&__HeapLimit) { /* __HeapLimit is end of heap section */
#else
if (new_heap >= (unsigned char*)__get_MSP()) {
if (new_heap >= (unsigned char*)__current_sp()) {
#endif
errno = ENOMEM;
return (caddr_t)-1;