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Enhance debugging capabilities of NetBSD/usermode by allowing `trap.c' to 

write a system image of the memory it traps. Its extremely dirty but at least
you can look at the data and code thats giving the trouble. Its memory or
state is NOT saved in the coredump of the NetBSD/usermode program.
This commit is contained in:
reinoud 2011-09-01 15:03:41 +00:00
parent c41a9ea5e1
commit fc8de2b005
1 changed files with 11 additions and 8 deletions
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19
sys/arch/usermode/usermode/trap.c
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@ -1,4 +1,4 @@
/* $NetBSD: trap.c,v 1.14 2011/08/31 12:42:41 reinoud Exp $ */
/* $NetBSD: trap.c,v 1.15 2011/09/01 15:03:41 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <reinoud@netbsd.org>
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.14 2011/08/31 12:42:41 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.15 2011/09/01 15:03:41 reinoud Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -85,6 +85,8 @@ static void
mem_access_handler(int sig, siginfo_t *info, void *ctx)
{
static volatile int recurse = 0;
static vaddr_t old_va, old_old_va = 0;
struct proc *p;
struct lwp *l;
struct pcb *pcb;
@ -106,7 +108,7 @@ mem_access_handler(int sig, siginfo_t *info, void *ctx)
onfault = pcb->pcb_onfault;
vm = p->p_vmspace;
#if 0
#if 1
va = (vaddr_t) info->si_addr;
printf("trap lwp = %p pid = %d lid = %d, va = %p\n",
curlwp,
@ -163,13 +165,14 @@ mem_access_handler(int sig, siginfo_t *info, void *ctx)
}
#if 0
//if (!rv) {
// static int off = 0;
printf("*va = %d\n", *((uint32_t *) va));
if (old_old_va)
thunk_pwrite(debug_fh, (void *) old_old_va, PAGE_SIZE, old_old_va);
if (old_va)
thunk_pwrite(debug_fh, (void *) old_va, PAGE_SIZE, old_va);
thunk_pwrite(debug_fh, (void *) va, PAGE_SIZE, va);
// off += PAGE_SIZE;
//}
#endif
old_old_va = old_va;
old_va = va;
if (rv) {
aprint_debug("uvm_fault returned error %d\n", rv);