25 lines
600 B
C
25 lines
600 B
C
// test user-level fault handler -- alloc pages to fix faults
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// doesn't work because we sys_cputs instead of cprintf (exercise: why?)
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#include <inc/lib.h>
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void
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handler(struct UTrapframe *utf)
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{
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int r;
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void *addr = (void*)utf->utf_fault_va;
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cprintf("fault %x\n", addr);
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if ((r = sys_page_alloc(0, ROUNDDOWN(addr, PGSIZE),
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PTE_P|PTE_U|PTE_W)) < 0)
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panic("allocating at %x in page fault handler: %e", addr, r);
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snprintf((char*) addr, 100, "this string was faulted in at %x", addr);
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}
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void
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umain(int argc, char **argv)
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{
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set_pgfault_handler(handler);
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sys_cputs((char*)0xDEADBEEF, 4);
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}
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