Last change
on this file since 1027 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)
|
File size:
1.3 KB
|
Line | |
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1 | /* |
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2 | * Check that we can take an interrupt, and return from it. |
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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 | |
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9 | .text |
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10 | .globl _start |
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11 | _start: |
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12 | .set noreorder |
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13 | la k0, TTY_BASE |
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14 | la k1, EXIT_BASE |
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15 | |
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16 | /* reset cop0 status (keep BEV), enbale soft interrupt 0 */ |
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17 | lui a0, 0x0040; |
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18 | addiu a0, 0x0101; |
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19 | mtc0 a0, COP0_STATUS |
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20 | |
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21 | /* reset cause, make sure IV is off */ |
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22 | mtc0 zero, COP0_CAUSE |
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23 | |
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24 | PRINT(startstr) |
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25 | |
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26 | /* generate an interrupt */ |
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27 | mfc0 a0, COP0_CAUSE |
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28 | nop |
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29 | ori a0, 0x0100 |
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30 | mtc0 a0, COP0_CAUSE |
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31 | li a0, MAGIC1 |
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32 | PRINTX |
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33 | PUTCHAR('\n') |
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34 | /* we should end here after taking the exeption */ |
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35 | EXIT(0) |
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36 | |
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37 | .globl excep |
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38 | excep: |
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39 | .set noreorder |
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40 | PRINT(statusstr) |
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41 | mfc0 a0, COP0_STATUS |
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42 | PRINTX |
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43 | |
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44 | PRINT(causestr) |
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45 | mfc0 a0, COP0_CAUSE |
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46 | PRINTX |
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47 | |
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48 | PRINT(pcstr) |
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49 | mfc0 a0, COP0_EXPC |
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50 | PRINTX |
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51 | |
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52 | PRINT(badvastr) |
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53 | mfc0 a0, COP_0_BADVADDR |
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54 | PRINTX |
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55 | |
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56 | PUTCHAR('\n') |
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57 | /* clear interrupt */ |
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58 | mfc0 a0, COP0_CAUSE |
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59 | xori a0, 0x100 |
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60 | mtc0 a0, COP0_CAUSE |
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61 | nop |
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62 | eret |
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63 | /* we should not end there */ |
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64 | EXIT(1) |
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65 | |
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66 | .rodata: |
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67 | statusstr: .ascii "status \0" |
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68 | causestr: .ascii " cause \0" |
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69 | pcstr: .ascii " pc \0" |
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70 | badvastr: .ascii " badva \0" |
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71 | startstr: .ascii "start\n\0" |
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72 | eretstr: .ascii "eret\n\0" |
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73 | |
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74 | .org EXCEP_ADDRESS - BOOT_ADDRESS |
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75 | .globl evect |
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76 | evect: |
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77 | j excep |
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78 | nop |
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79 | .data |
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80 | myvar: .word 0 |
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