e0a98a4d65
caused interrupts to be reenabled (due to unlock), which caused a race. The problems were especially visible on slower machines. * Relocated free memory parsing to process manager. This saved quite some code at the kernel level. Text size was reduced by about 650 bytes. * Removed locks for updating the realtime in the clock's main loop and the get_uptime function. Interrupts are no longer reentrant, so realtime is immediately updated.
75 lines
2.2 KiB
C
Executable file
75 lines
2.2 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 the kernel, MM and
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* FS cause 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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#include "debug.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",NO_NUM);
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return;
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}
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if (k_reenter == 0 && ! istaskp(saved_proc)) {
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unlock(7); /* this is protected like sys_call() */
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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", karg(ep->msg));
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kprintf("process number %d, ", proc_nr(saved_proc));
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kprintf("pc = %d:", (unsigned) saved_proc->p_reg.cs);
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kprintf("0x%x\n", (unsigned) saved_proc->p_reg.pc);
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kernel_exception = TRUE; /* directly shutdown */
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panic("exception in a kernel task", NO_NUM);
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}
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