source:
trunk/softs/tests_cc_vcache/test_syscall/test.S
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469
Last change on this file since 469 was 232, checked in by , 12 years ago | |
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1 | /* |
2 | * syscall test: check that a syscall generates an exception, and we can |
3 | * return |
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 | la sp, 0x00400000 - 16 |
15 | |
16 | PRINT(startstr) |
17 | |
18 | /* reset cop0 status (keep BEV) */ |
19 | lui a0, 0x0040; |
20 | mtc0 a0, COP0_STATUS |
21 | /* switch to user mode */ |
22 | mfc0 a0, COP0_STATUS |
23 | ori a0, 0x10 |
24 | mtc0 a0, COP0_STATUS |
25 | nop |
26 | nop |
27 | nop |
28 | PRINT(usrstr) |
29 | syscall |
30 | bne a3, zero, exit |
31 | nop |
32 | /* we should not get there, a3 is not 0 */ |
33 | EXIT(2) |
34 | exit: |
35 | move a0, v0 |
36 | PRINTX |
37 | PUTCHAR(' ') |
38 | move a0, v1 |
39 | PRINTX |
40 | PUTCHAR('\n') |
41 | /* we should get there */ |
42 | EXIT(0) |
43 | |
44 | .globl excep |
45 | excep: |
46 | .set noreorder |
47 | PRINT(statusstr) |
48 | mfc0 a0, COP0_STATUS |
49 | PRINTX |
50 | |
51 | PRINT(causestr) |
52 | mfc0 a0, COP0_CAUSE |
53 | PRINTX |
54 | |
55 | PRINT(pcstr) |
56 | mfc0 a0, COP0_EXPC |
57 | PRINTX |
58 | |
59 | PRINT(badvastr) |
60 | mfc0 a0, COP_0_BADVADDR |
61 | PRINTX |
62 | PUTCHAR('\n') |
63 | mfc0 a0, COP0_EXPC |
64 | addiu a0, a0, 4 |
65 | mtc0 a0, COP0_EXPC |
66 | li v0, MAGIC1 |
67 | li v1, MAGIC2 |
68 | li a3, 1 |
69 | eret |
70 | nop |
71 | |
72 | #we should not end there |
73 | EXIT(1) |
74 | |
75 | .rodata: |
76 | statusstr: .ascii "status \0" |
77 | causestr: .ascii " cause \0" |
78 | pcstr: .ascii " pc \0" |
79 | badvastr: .ascii " badva \0" |
80 | startstr: .ascii "start\n\0" |
81 | usrstr: .ascii "usrmode\n\0" |
82 | |
83 | .org EXCEP_ADDRESS - BOOT_ADDRESS |
84 | .globl evect |
85 | evect: |
86 | j excep |
87 | nop |
88 | .data |
89 | .word MAGIC1 |
90 | testval: |
91 | .word MAGIC2 |
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