newlib/libgloss/arm/libcfunc.c

/* Support files for GNU libc.  Files in the C namespace go here.
   Files in the system namespace (ie those that start with an underscore)
   go in syscalls.c.
   
   Note: These functions are in a seperate file so that OS providers can
   overrride the system call stubs (defined in syscalls.c) without having
   to provide libc funcitons as well.  */

#include "swi.h"
#include <errno.h>
#include <unistd.h>

#ifdef ARM_RDI_MONITOR
static inline int
do_AngelSWI (int reason, void * arg)
{
  int value;
  asm volatile ("mov r0, %1; mov r1, %2; swi %a3; mov %0, r0"
       : "=r" (value) /* Outputs */
       : "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */
       : "r0", "r1", "lr"
		/* Clobbers r0 and r1, and lr if in supervisor mode */);
  return value;
}
#endif /* ARM_RDI_MONITOR */

void
abort (void)
{
  extern void _exit (int n);
#ifdef ARM_RDI_MONITOR
  do_AngelSWI (AngelSWI_Reason_ReportException,
	      (void *) ADP_Stopped_RunTimeError);
#else
  _exit(17);
#endif
}

unsigned __attribute__((weak))
alarm (unsigned seconds)
{
	(void)seconds;
	return 0;
}

int _isatty(int fildes);
int __attribute__((weak))
isatty(int fildes)
{
	/* GDB does not yet support the IsTTY SWI that _isatty
	 * calls, so always return true for now.  */
	(void)fildes;
	return 1;
}

int __attribute__((weak))
pause (void)
{
	errno = ENOSYS;
	return -1;
}