stack.s

/*
 * ULP stack and subroutine macros
 */

.macro push rx
  st \rx,r3,0
  sub r3,r3,1
.endm

.macro pop rx
  add r3,r3,1
  ld \rx,r3,0
.endm

// Prepare subroutine jump, uses scratch register sr
.macro psr sr=r1 pos=.
  .set _next2,(\pos+16)
  move \sr,_next2
  push \sr
.endm

// Return from subroutine
.macro ret sr=r1
  pop  \sr
  jump \sr
.endm