StumpOS/macro_def.c at master · HarryFoster1812/StumpOS · GitHub

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#define sp r6
#define pc r7

#define WORD 1
#define NL __NL__
#define HASH __HASH__

#define PUSH(reg) add sp, sp, #WORD NL st reg, [ r0, sp ]

#define POP(reg) sub sp, sp, #WORD NL ld reg, [ sp, #1 ]

#define CALL_SAVE_R5(func)                                                     \
  PUSH(r5) NL CALL(func)                                                       \
  NL POP(r5)

#define CALL(func)                                                             \
  add r5, r7, #3;                                                              \
  r5 = return address(next instruction) NL PUSH(r5);                           \
  push return address NL bal func

#define SYSCALL()                                                              \
  add r5, r7, #3;                                                              \
  r5 = return address(next instruction) NL PUSH(r5);                           \
  push return address NL ld pc, [ r0, #sys_call_function ]

#define SYSCALL_SAVE_R5()                                                      \
  PUSH(r5) NL add r5, r7, #3;                                                  \
  r5 = return address(next instruction) NL PUSH(r5);                           \
  push return address NL ld pc, [ r0, #sys_call_function ] NL POP(r5)

#define return_macro ld pc, [ r0, #return ]
#define NULL r0

#define J_SYS_CALL(func_offset)                                                \
  add r5, r7, #4 NL PUSH(r5)                                                   \
  NL ld r5, [ r0, #sys_table_pointer ] NL ld r7, [ r5, HASH func_offset ];     \
  call the corresponding function

#define CALL_UTIL(func_offset)                                                 \
  add r5, r7, #4 NL PUSH(r5)                                                   \
  NL ld r5, [ r0, #util_table_pointer ] NL ld r7, [ r5, HASH func_offset ];    \
  call the corresponding function

#define J_SYS_CALL_FAR(func_offset)                                            \
  add r5, r7, #5 NL PUSH(r5)                                                   \
  NL ld r5, [ r0, #sys_table_pointer ] NL add r5, r5, #15 NL ld r7,            \
      [ r5, HASH func_offset ];                                                \
  call the corresponding function

#define FAR_SYS_IDX(func) add r4, r0, #15 NL add r4, r4, HASH func