libgloss/m32r/trap0.S

   1 ; Trap 0 handler (syscall interface).
   2 ;
   3 ; The trap handler returns the result in r0 and the error code (errno value)
   4 ; in r2.  r1 is reserved in case an 8 byte quantity ever needs to be
   5 ; returned in registers.
   6
   7         .text
   8         .global __trap0
   9 __trap0:
  10         trap    #0              ; trap 0 returns result in r0, error code in r2
  11         cmpui   r2,#1           ; is error code zero?
  12         bc      .Lret           ; yes, skip setting errno
  13         ld      r4,@(sp)        ; no, set errno
  14         st      r2,@r4
  15 .Lret:
  16         jmp     lr              ; return to caller