sdcc/support/regression/ports/mos6502/support.c

   1
   2 // sim65 constants
   3 #define SYS_open  0xfff4
   4 #define SYS_close 0xfff5
   5 #define SYS_read  0xfff6
   6 #define SYS_write 0xfff7
   7 #define SYS_args  0xfff8
   8 #define SYS_exit  0xfff9
   9
  10 typedef void (*sim65_write_t)(int count, const char* buf, int fd) __reentrant;
  11
  12 // sim65 expects a software stack
  13 unsigned short stack[8];
  14
  15 // stack pointer location defined in sim65 header
  16 unsigned short* __at(0x0) stackptr;
  17
  18 void
  19 _putchar(unsigned char c)
  20 {
  21   stackptr = stack;
  22   stackptr[0] = (short)&c;
  23   stackptr[1] = 1;
  24   (*(sim65_write_t)SYS_write)(1, &c, 1);
  25 }
  26
  27 void
  28 _initEmu(void)
  29 {
  30 }
  31
  32 void
  33 _exitEmu(void)
  34 {
  35   __asm
  36     jsr SYS_exit
  37   __endasm;
  38 }