Module Name: src
Committed By: reinoud
Date: Thu Sep 1 15:03:41 UTC 2011
Modified Files:
src/sys/arch/usermode/usermode: trap.c
Log Message:
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.
To generate a diff of this commit:
cvs rdiff -u -r1.14 -r1.15 src/sys/arch/usermode/usermode/trap.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/usermode/usermode/trap.c
diff -u src/sys/arch/usermode/usermode/trap.c:1.14 src/sys/arch/usermode/usermode/trap.c:1.15
--- src/sys/arch/usermode/usermode/trap.c:1.14 Wed Aug 31 12:42:41 2011
+++ src/sys/arch/usermode/usermode/trap.c Thu Sep 1 15:03:41 2011
@@ -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 <rein...@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 @@
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 @@
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 @@
}
#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);
