Make stack traces on exceptions possible.
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3 changed files with 39 additions and 0 deletions
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@ -20,6 +20,7 @@
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* are disabled.
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*/
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#define DEBUG_ENABLE_IPC_WARNINGS 0
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#define DEBUG_STACKTRACE 1
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/* It's interesting to measure the time spent withing locked regions, because
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* this is the time that the system is deaf to interrupts.
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@ -65,6 +65,10 @@ unsigned vec_nr;
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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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@ -85,3 +89,34 @@ unsigned vec_nr;
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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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@ -74,6 +74,9 @@ _PROTOTYPE( int newmap, (struct proc *rp, struct mem_map *map_ptr) );
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/* exception.c */
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_PROTOTYPE( void exception, (unsigned vec_nr) );
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#if DEBUG_STACK_TRACE
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_PROTOTYPE( void stacktrace, (struct proc *) );
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#endif
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/* i8259.c */
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_PROTOTYPE( void intr_init, (int mine) );
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