diff options
Diffstat (limited to 'sim/testsuite/d30v-elf/tick.s')
| -rw-r--r-- | sim/testsuite/d30v-elf/tick.s | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/sim/testsuite/d30v-elf/tick.s b/sim/testsuite/d30v-elf/tick.s new file mode 100644 index 0000000..d834ca7 --- /dev/null +++ b/sim/testsuite/d30v-elf/tick.s @@ -0,0 +1,51 @@ + .globl _start + # + # NOTE: Registers r10-r11 are reserved for the interrupt handler + # while the others can be used by the main loop/start code. + +_start: + # patch the external interrupt handlers entry + add r1, r0, handler + ldw r2, @(r1, 0) + ldw r3, @(r1, 4) + add r1, r0, 0xfffff138 + stw r2, @(r1, 0) + stw r3, @(r1, 4) + + # enable external interrupts - cr0 == PSW + mvfsys r2, cr0 + or r2, r0, 0x04000000 + mvtsys cr0, r2 + + + # wait for flag to be set +loop: + add r2, r0, flag + ldw r3, @(r2, 0) + bratzr r3, loop + + # clear the flag + stw r0, @(r2, 0) + + add r2, r0, tick + # putstr + .long 0x0e000001, 0x00f00000 + + bra loop + + # finished + add r2, r0, r0 || nop + .long 0x0e000004, 0x00f00000 + + +handler: + jmp real_handler +real_handler: + add r10, r0, 1 + add r11, r0, flag + stb r10, @(r11,0) + reit + + +flag: .long 0 +tick: .ascii "Tick\r\n" |