diff options
| author | Jeff Dike <jdike@addtoit.com> | 2006-09-25 23:33:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:49:07 -0700 |
| commit | 4b84c69b5f6c08a540e3683f1360a6cdef2806c7 (patch) | |
| tree | 708f1e4cbc2771886aaeb8eadb3ae4d458bc8133 /arch/um/include | |
| parent | 19bdf0409f25a85a45874a5a8da6f3e4edcf4a49 (diff) | |
[PATCH] uml: Move signal handlers to arch code
Have most signals go through an arch-provided handler which recovers the
sigcontext and then calls a generic handler. This replaces the
ARCH_GET_SIGCONTEXT macro, which was somewhat fragile. On x86_64, recovering
%rdx (which holds the sigcontext pointer) must be the first thing that
happens. sig_handler duly invokes that first, but there is no guarantee that
I can see that instructions won't be reordered such that %rdx is used before
that. Having the arch provide the handler seems much more robust.
Some signals in some parts of UML require their own handlers - these places
don't call set_handler any more. They call sigaction or signal themselves.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/include')
| -rw-r--r-- | arch/um/include/sysdep-i386/signal.h | 27 | ||||
| -rw-r--r-- | arch/um/include/sysdep-x86_64/signal.h | 29 |
2 files changed, 0 insertions, 56 deletions
diff --git a/arch/um/include/sysdep-i386/signal.h b/arch/um/include/sysdep-i386/signal.h deleted file mode 100644 index 07518b162136..000000000000 --- a/arch/um/include/sysdep-i386/signal.h +++ /dev/null @@ -1,27 +0,0 @@ -/* - * Copyright (C) 2004 PathScale, Inc - * Licensed under the GPL - */ - -#ifndef __I386_SIGNAL_H_ -#define __I386_SIGNAL_H_ - -#include <signal.h> - -#define ARCH_SIGHDLR_PARAM int sig - -#define ARCH_GET_SIGCONTEXT(sc, sig) \ - do sc = (struct sigcontext *) (&sig + 1); while(0) - -#endif - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/include/sysdep-x86_64/signal.h b/arch/um/include/sysdep-x86_64/signal.h deleted file mode 100644 index 6142897af3d1..000000000000 --- a/arch/um/include/sysdep-x86_64/signal.h +++ /dev/null @@ -1,29 +0,0 @@ -/* - * Copyright (C) 2004 PathScale, Inc - * Licensed under the GPL - */ - -#ifndef __X86_64_SIGNAL_H_ -#define __X86_64_SIGNAL_H_ - -#define ARCH_SIGHDLR_PARAM int sig - -#define ARCH_GET_SIGCONTEXT(sc, sig_addr) \ - do { \ - struct ucontext *__uc; \ - asm("movq %%rdx, %0" : "=r" (__uc)); \ - sc = (struct sigcontext *) &__uc->uc_mcontext; \ - } while(0) - -#endif - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ |