I'm porting code written from mspgcc 4.6.3 into a CCS 6.0.1 project with TI mspgcc 4.9.1.
MSP430FR59xx is the MCU type.
When linking the symbol _end (as I can read from the code it is the start of RAM + sizeof(data) + sizeof(bss) ) is undefined:
./cpu/msp430-common/msp430-main.o:(.data+0x0): undefined reference to `_end' collect2.exe: error: ld returned 1 exit status
What symbol name instead of _end I have to use for gcc 4.9.1?
below the code snippet:
extern int _end; /* Not in sys/unistd.h */
static char *cur_break = (char *) &_end;
#define asmv(arg) __asm__ __volatile__(arg)
#define STACK_EXTRA 32
/*
* Allocate memory from the heap. Check that we don't collide with the
* stack right now (some other routine might later). A watchdog might
* be used to check if cur_break and the stack pointer meet during
* runtime.
*/
void *sbrk(int incr)
{
char *stack_pointer;
asmv("mov r1, %0" : "=r"(stack_pointer));
stack_pointer -= STACK_EXTRA;
if (incr > (stack_pointer - cur_break)) {
return (void *) - 1; /* ENOMEM */
}
void *old_break = cur_break;
cur_break += incr;
/*
* If the stack was never here then [old_break .. cur_break] should
* be filled with zeros.
*/
return old_break;
}
Greetings
Attilio
