android_kernel_xiaomi_sm8350/arch/um/os-Linux/skas/trap.c
Jeff Dike edea138584 uml: tidy kern_util.h
Tidy kern_util.h.  It turns out that most of the function declarations
aren't used, so they can go away.  os.h no longer includes
kern_util.h, so files which got it through os.h now need to include it
directly.  A number of other files never needed it, so these includes
are deleted.

The structure which was used to pass signal handlers from the kernel
side to the userspace side is gone.  Instead, the handlers are
declared here, and used directly from libc code.  This allows
arch/um/os-Linux/trap.c to be deleted, with its remnants being moved
to arch/um/os-Linux/skas/trap.c.

arch/um/os-Linux/tty.c had its inclusions changed, and it needed some
style attention, so it got tidied.

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>
2008-02-05 09:44:26 -08:00

74 lines
1.8 KiB
C

/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <errno.h>
#include <signal.h>
#include "sysdep/ptrace.h"
#include "kern_constants.h"
#include "as-layout.h"
#include "kern_util.h"
#include "os.h"
#include "sigcontext.h"
#include "task.h"
void (*sig_info[NSIG])(int, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
[SIGFPE] = relay_signal,
[SIGILL] = relay_signal,
[SIGWINCH] = winch,
[SIGBUS] = bus_handler,
[SIGSEGV] = segv_handler,
[SIGIO] = sigio_handler,
[SIGVTALRM] = timer_handler };
static struct uml_pt_regs ksig_regs[UM_NR_CPUS];
void sig_handler_common_skas(int sig, void *sc_ptr)
{
struct sigcontext *sc = sc_ptr;
struct uml_pt_regs *r;
void (*handler)(int, struct uml_pt_regs *);
int save_user, save_errno = errno;
/*
* This is done because to allow SIGSEGV to be delivered inside a SEGV
* handler. This can happen in copy_user, and if SEGV is disabled,
* the process will die.
* XXX Figure out why this is better than SA_NODEFER
*/
if (sig == SIGSEGV) {
change_sig(SIGSEGV, 1);
/*
* For segfaults, we want the data from the
* sigcontext. In this case, we don't want to mangle
* the process registers, so use a static set of
* registers. For other signals, the process
* registers are OK.
*/
r = &ksig_regs[cpu()];
copy_sc(r, sc_ptr);
}
else r = TASK_REGS(get_current());
save_user = r->is_user;
r->is_user = 0;
if ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
(sig == SIGILL) || (sig == SIGTRAP))
GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
change_sig(SIGUSR1, 1);
handler = sig_info[sig];
/* unblock SIGVTALRM, SIGIO if sig isn't IRQ signal */
if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
unblock_signals();
handler(sig, r);
errno = save_errno;
r->is_user = save_user;
}