uml: simplify SIGSEGV handling

Simplify the page fault stub by not masking signals while it is running.  This
allows it to signal that it is done by executing an instruction which will
generate a SIGTRAP (int3 on x86) rather than running sigreturn by hand after
queueing a blocked SIGUSR1.

userspace_tramp now no longer puts anything in the SIGSEGV sa_mask, but it
does add SA_NODEFER to sa_flags so that SIGSEGV is still enabled after the
signal handler fails to run sigreturn.

SIGWINCH is just blocked so that we don't have to deal with it and the signal
masks used by wait_stub_done are updated to reflect the smaller number of
signals that it has to worry about.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 34 deletions

diff --git a/arch/um/sys-x86_64/stub_segv.c b/arch/um/sys-x86_64/stub_segv.c
index 3afb590f0072..ced051afc705 100644
--- a/arch/um/sys-x86_64/stub_segv.c
+++ b/arch/um/sys-x86_64/stub_segv.c
@@ -1,51 +1,22 @@
 /*
- * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
-#include <stddef.h>
 #include <signal.h>
-#include <asm/unistd.h>
 #include "as-layout.h"
-#include "uml-config.h"
-#include "sysdep/sigcontext.h"
-#include "sysdep/faultinfo.h"
 #include "sysdep/stub.h"
-
-/* Copied from sys-x86_64/signal.c - Can't find an equivalent definition
- * in the libc headers anywhere.
- */
-struct rt_sigframe
-{
-        char *pretcode;
-        struct ucontext uc;
-        struct siginfo info;
-};
-
-/* Copied here from <linux/kernel.h> - we're userspace. */
-#define container_of(ptr, type, member) ({                   \
-        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
-        (type *)( (char *)__mptr - offsetof(type,member) );})
+#include "sysdep/faultinfo.h"
+#include "sysdep/sigcontext.h"
 
 void __attribute__ ((__section__ (".__syscall_stub")))
 stub_segv_handler(int sig)
 {
         struct ucontext *uc;
-        int pid;
 
         __asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :);
         GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA),
                               &uc->uc_mcontext);
-
-        pid = stub_syscall0(__NR_getpid);
-        stub_syscall2(__NR_kill, pid, SIGUSR1);
-
-        /* sys_sigreturn expects that the stack pointer will be 8 bytes into
-         * the signal frame.  So, we use the ucontext pointer, which we know
-         * already, to get the signal frame pointer, and add 8 to that.
-         */
-        __asm__ __volatile__("movq %0, %%rsp; movq %1, %%rax ; syscall": :
-                             "g" ((unsigned long)
-                                  container_of(uc, struct rt_sigframe, uc) + 8),
-                             "g" (__NR_rt_sigreturn));
+        trap_myself();
 }
+