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Last change
on this file since 520 was
520,
checked in by bouyer, 11 years ago
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Re-add the tests; reverting previous which was done at the wrong level (sorry)
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File size:
1.3 KB
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| 1 | /* |
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| 2 | * Check that we can take an interrupt, and return to a different address. |
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| 3 | * We use a software-triggerted interrupt. |
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| 4 | */ |
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| 5 | #include <registers.h> |
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| 6 | #include <misc.h> |
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| 7 | |
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| 8 | .text |
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| 9 | .globl _start |
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| 10 | _start: |
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| 11 | .set noreorder |
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| 12 | la k0, TTY_BASE |
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| 13 | la k1, EXIT_BASE |
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| 14 | |
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| 15 | /* reset cop0 status (keep BEV), enbale soft interrupt 0 */ |
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| 16 | lui a0, 0x0040; |
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| 17 | addiu a0, 0x0101; |
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| 18 | mtc0 a0, COP0_STATUS |
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| 19 | |
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| 20 | /* reset cause, make sure IV is off */ |
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| 21 | mtc0 zero, COP0_CAUSE |
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| 22 | |
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| 23 | PRINT(startstr) |
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| 24 | |
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| 25 | /* generate an interrupt */ |
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| 26 | mfc0 a0, COP0_CAUSE |
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| 27 | nop |
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| 28 | ori a0, 0x0100 |
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| 29 | mtc0 a0, COP0_CAUSE |
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| 30 | nop |
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| 31 | /* we should not end there */ |
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| 32 | EXIT(1) |
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| 33 | |
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| 34 | exret: |
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| 35 | PRINT(eretstr) |
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| 36 | EXIT(0) |
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| 37 | |
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| 38 | |
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| 39 | .globl excep |
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| 40 | excep: |
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| 41 | .set noreorder |
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| 42 | PRINT(statusstr) |
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| 43 | mfc0 a0, COP0_STATUS |
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| 44 | PRINTX |
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| 45 | |
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| 46 | PRINT(causestr) |
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| 47 | mfc0 a0, COP0_CAUSE |
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| 48 | PRINTX |
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| 49 | |
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| 50 | PRINT(pcstr) |
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| 51 | mfc0 a0, COP0_EXPC |
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| 52 | PRINTX |
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| 53 | |
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| 54 | PRINT(badvastr) |
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| 55 | mfc0 a0, COP_0_BADVADDR |
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| 56 | PRINTX |
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| 57 | |
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| 58 | PUTCHAR('\n') |
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| 59 | /* clear interrupt */ |
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| 60 | mfc0 a0, COP0_CAUSE |
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| 61 | xori a0, 0x100 |
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| 62 | mtc0 a0, COP0_CAUSE |
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| 63 | nop |
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| 64 | la a0, exret |
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| 65 | mtc0 a0, COP0_EXPC |
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| 66 | nop |
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| 67 | eret |
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| 68 | /* we should not end there */ |
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| 69 | EXIT(1) |
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| 70 | |
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| 71 | .rodata: |
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| 72 | statusstr: .ascii "status \0" |
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| 73 | causestr: .ascii " cause \0" |
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| 74 | pcstr: .ascii " pc \0" |
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| 75 | badvastr: .ascii " badva \0" |
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| 76 | startstr: .ascii "start\n\0" |
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| 77 | eretstr: .ascii "eret\n\0" |
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| 78 | |
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| 79 | .org EXCEP_ADDRESS - BOOT_ADDRESS |
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| 80 | .globl evect |
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| 81 | evect: |
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| 82 | j excep |
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| 83 | nop |
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| 84 | .data |
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| 85 | myvar: .word 0 |
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