Module Name: src
Committed By: reinoud
Date: Thu Sep 1 18:20:20 UTC 2011
Modified Files:
src/sys/arch/usermode/usermode: trap.c
Log Message:
Use a alternative dedicated signal stack for the sigsegv errors; the userland
stack like that of ld.elf_so can be too short to allow for such deep
stacktraces.
To generate a diff of this commit:
cvs rdiff -u -r1.15 -r1.16 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:1.15 src/sys/arch/usermode/usermode/trap.c:1.16
--- src/sys/arch/usermode/usermode/trap.c:1.15 Thu Sep 1 15:03:41 2011
+++ src/sys/arch/usermode/usermode/trap.c Thu Sep 1 18:20:20 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: trap.c,v 1.15 2011/09/01 15:03:41 reinoud Exp $ */
+/* $NetBSD: trap.c,v 1.16 2011/09/01 18:20:20 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <[email protected]>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.15 2011/09/01 15:03:41 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.16 2011/09/01 18:20:20 reinoud Exp $");
#include <sys/types.h>
#include <sys/param.h>
@@ -56,6 +56,7 @@
bool pmap_fault(pmap_t pmap, vaddr_t va, vm_prot_t *atype);
+static stack_t sigstk;
static int debug_fh;
void
@@ -69,12 +70,18 @@
static struct sigaction sa;
sigemptyset(&sa.sa_mask);
- sa.sa_flags = SA_RESTART | SA_SIGINFO;
+ sa.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
sa.sa_sigaction = mem_access_handler;
if (thunk_sigaction(SIGSEGV, &sa, NULL) == -1)
panic("couldn't register SIGSEGV handler : %d", errno);
if (thunk_sigaction(SIGBUS, &sa, NULL) == -1)
panic("couldn't register SIGBUS handler : %d", errno);
+ if ((sigstk.ss_sp = thunk_malloc(SIGSTKSZ)) == NULL)
+ panic("can't allocate signal stack space\n");
+ sigstk.ss_size = SIGSTKSZ;
+ sigstk.ss_flags = 0;
+ if (thunk_sigaltstack(&sigstk, 0) < 0)
+ panic("can't set alternate stacksize : %d", errno);
debug_fh = thunk_open("/usr/sources/debug", O_RDWR | O_TRUNC | O_CREAT, 0666);
}
@@ -108,7 +115,7 @@
onfault = pcb->pcb_onfault;
vm = p->p_vmspace;
-#if 1
+#if 0
va = (vaddr_t) info->si_addr;
printf("trap lwp = %p pid = %d lid = %d, va = %p\n",
curlwp,
