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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2787 | decky | 1 | /** @addtogroup ia32 |
| 2 | * @{ |
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| 3 | */ |
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| 4 | /** @file |
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| 5 | */ |
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| 6 | |||
| 7 | #include <proc/thread.h> |
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| 8 | #include <console/klog.h> |
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| 9 | #include <arch/tdebug.h> |
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| 10 | |||
| 11 | /* trap flag */ |
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| 12 | #define EFLAGS_TF 0x100 |
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| 13 | |||
| 14 | /** |
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| 15 | * Called when the IAFTER event setting is (potentially) changed. |
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| 16 | * |
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| 17 | * On this arch the TRAP flag in userspace state is set |
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| 18 | * according to the setting of TDEBUG_EVMASK_IAFTER |
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| 19 | * in order to stop after the execution of each instruction. |
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| 20 | * |
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| 21 | * The calling thread must have already locked t. |
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| 22 | * |
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| 23 | * Returns 0 on success, non-zero on failure. (Mainly if IAFTER is set, but |
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| 24 | * architecture does not support it.) |
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| 25 | */ |
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| 26 | int tdebug_iafter_update(thread_t *t) |
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| 27 | { |
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| 28 | uint32_t eflags; |
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| 29 | |||
| 30 | if (t->tdebug.uspace_state == NULL) { |
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| 31 | /* userspace state is not available */ |
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| 32 | /* FIXME: this should not happen when properly imlemented */ |
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| 33 | klog_printf("fail: uspace_state not available\n"); |
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| 34 | return -1; |
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| 35 | } |
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| 36 | |||
| 37 | eflags = t->tdebug.uspace_state->eflags; |
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| 38 | |||
| 39 | if ((t->tdebug.event_mask & TDEBUG_EVMASK_IAFTER) != 0) { |
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| 40 | eflags = eflags | EFLAGS_TF; |
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| 41 | } else { |
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| 42 | eflags = eflags & ~EFLAGS_TF; |
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| 43 | } |
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| 44 | |||
| 45 | t->tdebug.uspace_state->eflags = eflags; |
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| 46 | return 0; |
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| 47 | } |
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| 48 | |||
| 49 | |||
| 50 | /** @} |
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| 51 | */ |