source: trunk/softs/tests_cc_vcache/test_interrupt_epc_modify/test.S

Last change on this file was 520, checked in by bouyer, 11 years ago

Re-add the tests; reverting previous which was done at the wrong level (sorry)

File size: 1.3 KB
Line 
1/*
2 * Check that we can take an interrupt, and return to a different address.
3 * We use a software-triggerted interrupt.
4 */
5#include <registers.h>
6#include <misc.h>
7
8        .text
9        .globl  _start
10_start:
11        .set noreorder
12        la      k0, TTY_BASE
13        la      k1, EXIT_BASE
14
15        /* reset cop0 status (keep BEV), enbale soft interrupt 0 */
16        lui     a0, 0x0040;
17        addiu   a0, 0x0101;
18        mtc0    a0, COP0_STATUS
19
20        /* reset cause, make sure IV is off */
21        mtc0    zero, COP0_CAUSE
22
23        PRINT(startstr)
24
25        /* generate an interrupt */
26        mfc0    a0, COP0_CAUSE
27        nop
28        ori     a0, 0x0100
29        mtc0    a0, COP0_CAUSE
30        nop
31        /* we should not end there */
32        EXIT(1)
33
34exret:
35        PRINT(eretstr)
36        EXIT(0)
37
38
39        .globl excep
40excep:
41        .set noreorder
42        PRINT(statusstr)
43        mfc0    a0, COP0_STATUS
44        PRINTX
45
46        PRINT(causestr)
47        mfc0    a0, COP0_CAUSE
48        PRINTX
49
50        PRINT(pcstr)
51        mfc0    a0, COP0_EXPC
52        PRINTX
53
54        PRINT(badvastr)
55        mfc0    a0, COP_0_BADVADDR
56        PRINTX
57
58        PUTCHAR('\n')
59        /* clear interrupt */
60        mfc0    a0, COP0_CAUSE
61        xori    a0, 0x100
62        mtc0    a0, COP0_CAUSE
63        nop
64        la      a0, exret
65        mtc0    a0, COP0_EXPC
66        nop
67        eret
68        /* we should not end there */
69        EXIT(1)
70
71        .rodata:
72statusstr: .ascii "status \0"
73causestr: .ascii " cause \0"
74pcstr: .ascii " pc \0"
75badvastr: .ascii " badva \0"
76startstr: .ascii "start\n\0"
77eretstr: .ascii "eret\n\0"
78
79        .org EXCEP_ADDRESS - BOOT_ADDRESS
80        .globl evect
81evect:
82        j       excep
83        nop
84        .data
85myvar:  .word 0
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