sim/testsuite/d30v-elf/os-dbt.S

   1         .globl _start
   2         #
   3         # NOTE: Registers r10-r11 are reserved for the interrupt handler
   4         #       while the others can be used by the main loop/start code.
   5
   6 _start:
   7         # patch the DBT handler
   8         add r1, r0, handler
   9         ldw r2, @(r1, 0)
  10         ldw r3, @(r1, 4)
  11         # DBT vector address
  12         add r1, r0, 0xfffff120
  13         stw r2, @(r1, 0)
  14         stw r3, @(r1, 4)
  15
  16         # try out the breakpoint/return
  17         add r2, r0, 47
  18         #dbt
  19         nop
  20         .long 0x00b00000
  21         nop
  22
  23         # exit with what ever the breakpoint hander set r2 to.
  24         nop
  25         .long 0x0e000004
  26         nop
  27
  28 handler:
  29         jmp real_handler
  30
  31         # The Breakpoint handler sets r2 to 0 if PSW was set correctly.
  32 real_handler:
  33         mvfsys r2, cr0
  34         sub r2, r0, 0x08000000
  35         #rtd
  36         nop
  37         .long 0x00a00000
  38         nop