Module Name: src
Committed By: reinoud
Date: Sun Sep 4 20:54:52 UTC 2011
Modified Files:
src/sys/arch/usermode/dev: cpu.c
src/sys/arch/usermode/include: pcb.h
src/sys/arch/usermode/usermode: trap.c
Log Message:
Try to preserve errno over traps and on context switches
To generate a diff of this commit:
cvs rdiff -u -r1.27 -r1.28 src/sys/arch/usermode/dev/cpu.c
cvs rdiff -u -r1.8 -r1.9 src/sys/arch/usermode/include/pcb.h
cvs rdiff -u -r1.21 -r1.22 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/dev/cpu.c
diff -u src/sys/arch/usermode/dev/cpu.c:1.27 src/sys/arch/usermode/dev/cpu.c:1.28
--- src/sys/arch/usermode/dev/cpu.c:1.27 Sat Sep 3 19:06:49 2011
+++ src/sys/arch/usermode/dev/cpu.c Sun Sep 4 20:54:52 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.c,v 1.27 2011/09/03 19:06:49 jmcneill Exp $ */
+/* $NetBSD: cpu.c,v 1.28 2011/09/04 20:54:52 reinoud Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <[email protected]>
@@ -29,7 +29,7 @@
#include "opt_cpu.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.27 2011/09/03 19:06:49 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.28 2011/09/04 20:54:52 reinoud Exp $");
#include <sys/param.h>
#include <sys/conf.h>
@@ -186,13 +186,16 @@
ci->ci_stash = oldlwp;
curlwp = newlwp;
+
if (oldpcb) {
+ oldpcb->errno = thunk_geterrno();
if (thunk_swapcontext(&oldpcb->pcb_ucp, &newpcb->pcb_ucp))
panic("swapcontext failed");
} else {
if (thunk_setcontext(&newpcb->pcb_ucp))
panic("setcontext failed");
}
+ thunk_seterrno(newpcb->errno);
#ifdef CPU_DEBUG
printf("cpu_switchto: returning %p (was %p)\n", ci->ci_stash, oldlwp);
Index: src/sys/arch/usermode/include/pcb.h
diff -u src/sys/arch/usermode/include/pcb.h:1.8 src/sys/arch/usermode/include/pcb.h:1.9
--- src/sys/arch/usermode/include/pcb.h:1.8 Fri Sep 2 16:09:01 2011
+++ src/sys/arch/usermode/include/pcb.h Sun Sep 4 20:54:52 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: pcb.h,v 1.8 2011/09/02 16:09:01 reinoud Exp $ */
+/* $NetBSD: pcb.h,v 1.9 2011/09/04 20:54:52 reinoud Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <[email protected]>
@@ -37,6 +37,7 @@
* XXX move to frame.h?
*/
+/* XXX unused XXX */
typedef struct trapframe {
int (*tf_syscall)(lwp_t *, struct trapframe *);
int tf_reason; /* XXX unused */
@@ -49,7 +50,9 @@
ucontext_t pcb_userland_ucp; /* userland switchframe */
bool pcb_needfree;
struct trapframe pcb_tf;
- void * pcb_onfault; /* on fault handler */
+ void * pcb_onfault; /* on fault handler */
+
+ int errno; /* save/restore place */
};
#endif /* !_ARCH_USERMODE_INCLUDE_PCB_H */
Index: src/sys/arch/usermode/usermode/trap.c
diff -u src/sys/arch/usermode/usermode/trap.c:1.21 src/sys/arch/usermode/usermode/trap.c:1.22
--- src/sys/arch/usermode/usermode/trap.c:1.21 Sun Sep 4 12:17:59 2011
+++ src/sys/arch/usermode/usermode/trap.c Sun Sep 4 20:54:52 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: trap.c,v 1.21 2011/09/04 12:17:59 jmcneill Exp $ */
+/* $NetBSD: trap.c,v 1.22 2011/09/04 20:54:52 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <[email protected]>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.21 2011/09/04 12:17:59 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.22 2011/09/04 20:54:52 reinoud Exp $");
#include <sys/types.h>
#include <sys/param.h>
@@ -125,6 +125,7 @@
onfault = pcb->pcb_onfault;
vm = p->p_vmspace;
+ pcb->errno = thunk_geterrno();
#if 0
va = (vaddr_t) info->si_addr;
printf("mem trap lwp = %p pid = %d lid = %d, va = %p\n",
@@ -215,10 +216,11 @@
/* XXX HOWTO see arm/arm/syscall.c illegal instruction signal */
}
- if (recurse > 1)
- printf("leaving trap recursion level %d\n", recurse);
- recurse--;
+ thunk_seterrno(pcb->errno);
}
+ if (recurse > 1)
+ printf("leaving trap recursion level %d\n", recurse);
+ recurse--;
}
static void
