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#include <debug.h>
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#include <debug.h>
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/** Handle syscall userspace call */
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/** Handle syscall userspace call */
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static void syscall_exception(int n, istate_t *istate)
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static void syscall_exception(int n, istate_t *istate)
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{
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{
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    interrupts_enable();
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    interrupts_enable();
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    if (istate->a3 < SYSCALL_END)
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    if (istate->t0 < SYSCALL_END)
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        istate->v0 = syscall_table[istate->a3](istate->a0,
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        istate->v0 = syscall_table[istate->t0](istate->a0,
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                               istate->a1,
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                               istate->a1,
- 
 
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                               istate->a2,
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                               istate->a2);
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                               istate->a3);
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    else
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    else
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        panic("Undefined syscall %d", istate->a3);
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        panic("Undefined syscall %d", istate->a3);
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    istate->epc += 4;
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    istate->epc += 4;
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    interrupts_disable();
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    interrupts_disable();
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}
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}