123 lines
3.4 KiB
C
Executable File
123 lines
3.4 KiB
C
Executable File
/* This file contains a simple exception handler. Exceptions in user
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* processes are converted to signals. Exceptions in a kernel task cause
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* a panic.
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*/
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#include "kernel.h"
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#include <signal.h>
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#include "proc.h"
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/*===========================================================================*
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* exception *
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*===========================================================================*/
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PUBLIC void exception(vec_nr)
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unsigned vec_nr;
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{
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/* An exception or unexpected interrupt has occurred. */
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struct ex_s {
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char *msg;
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int signum;
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int minprocessor;
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};
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static struct ex_s ex_data[] = {
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{ "Divide error", SIGFPE, 86 },
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{ "Debug exception", SIGTRAP, 86 },
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{ "Nonmaskable interrupt", SIGBUS, 86 },
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{ "Breakpoint", SIGEMT, 86 },
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{ "Overflow", SIGFPE, 86 },
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{ "Bounds check", SIGFPE, 186 },
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{ "Invalid opcode", SIGILL, 186 },
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{ "Coprocessor not available", SIGFPE, 186 },
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{ "Double fault", SIGBUS, 286 },
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{ "Copressor segment overrun", SIGSEGV, 286 },
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{ "Invalid TSS", SIGSEGV, 286 },
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{ "Segment not present", SIGSEGV, 286 },
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{ "Stack exception", SIGSEGV, 286 }, /* STACK_FAULT already used */
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{ "General protection", SIGSEGV, 286 },
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{ "Page fault", SIGSEGV, 386 }, /* not close */
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{ NIL_PTR, SIGILL, 0 }, /* probably software trap */
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{ "Coprocessor error", SIGFPE, 386 },
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};
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register struct ex_s *ep;
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struct proc *saved_proc;
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/* Save proc_ptr, because it may be changed by debug statements. */
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saved_proc = proc_ptr;
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ep = &ex_data[vec_nr];
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if (vec_nr == 2) { /* spurious NMI on some machines */
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kprintf("got spurious NMI\n");
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return;
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}
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/* If an exception occurs while running a process, the k_reenter variable
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* will be zero. Exceptions in interrupt handlers or system traps will make
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* k_reenter larger than zero.
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*/
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if (k_reenter == 0 && ! iskernelp(saved_proc)) {
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#if 0
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{
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kprintf(
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"exception for process %d, pc = 0x%x:0x%x, sp = 0x%x:0x%x\n",
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proc_nr(saved_proc),
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saved_proc->p_reg.cs, saved_proc->p_reg.pc,
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saved_proc->p_reg.ss, saved_proc->p_reg.sp);
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kprintf("edi = 0x%x\n", saved_proc->p_reg.di);
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#if DEBUG_STACKTRACE
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stacktrace(saved_proc);
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#endif
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}
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#endif
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cause_sig(proc_nr(saved_proc), ep->signum);
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return;
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}
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/* Exception in system code. This is not supposed to happen. */
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if (ep->msg == NIL_PTR || machine.processor < ep->minprocessor)
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kprintf("\nIntel-reserved exception %d\n", vec_nr);
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else
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kprintf("\n%s\n", ep->msg);
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kprintf("k_reenter = %d ", k_reenter);
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kprintf("process %d (%s), ", proc_nr(saved_proc), saved_proc->p_name);
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kprintf("pc = %u:0x%x", (unsigned) saved_proc->p_reg.cs,
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(unsigned) saved_proc->p_reg.pc);
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panic("exception in a kernel task", NO_NUM);
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}
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#if DEBUG_STACKTRACE
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/*===========================================================================*
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* stacktrace *
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*===========================================================================*/
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PUBLIC void stacktrace(proc)
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struct proc *proc;
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{
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reg_t bp, v_bp, v_pc, v_hbp;
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v_bp = proc->p_reg.fp;
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kprintf("stacktrace: ");
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while(v_bp) {
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phys_bytes p;
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if(!(p = umap_local(proc, D, v_bp, sizeof(v_bp)))) {
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kprintf("(bad bp %lx)", v_bp);
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break;
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}
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phys_copy(p+sizeof(v_pc), vir2phys(&v_pc), sizeof(v_pc));
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phys_copy(p, vir2phys(&v_hbp), sizeof(v_hbp));
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kprintf("0x%lx ", (unsigned long) v_pc);
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if(v_hbp != 0 && v_hbp <= v_bp) {
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kprintf("(bad hbp %lx)", v_hbp);
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break;
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}
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v_bp = v_hbp;
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}
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kprintf("\n");
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}
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#endif
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