Fix select on /proc files without ->poll
[linux-2.6] / arch / um / os-Linux / skas / trap.c
CommitLineData
ea2ba7dc 1/*
1da177e4
LT
2 * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
4 */
5
6#include <signal.h>
7#include <errno.h>
1da177e4 8#include "kern_util.h"
4ff83ce1 9#include "as-layout.h"
1da177e4
LT
10#include "task.h"
11#include "sigcontext.h"
c578455a
BS
12#include "skas.h"
13#include "ptrace_user.h"
14#include "sysdep/ptrace.h"
15#include "sysdep/ptrace_user.h"
0805d89c 16#include "os.h"
1da177e4 17
377fad3a
JD
18static union uml_pt_regs ksig_regs[UM_NR_CPUS];
19
1da177e4
LT
20void sig_handler_common_skas(int sig, void *sc_ptr)
21{
22 struct sigcontext *sc = sc_ptr;
5d86456d 23 union uml_pt_regs *r;
ea2ba7dc 24 void (*handler)(int, union uml_pt_regs *);
5d86456d 25 int save_user, save_errno = errno;
1da177e4
LT
26
27 /* This is done because to allow SIGSEGV to be delivered inside a SEGV
28 * handler. This can happen in copy_user, and if SEGV is disabled,
29 * the process will die.
30 * XXX Figure out why this is better than SA_NODEFER
31 */
377fad3a 32 if(sig == SIGSEGV) {
1da177e4 33 change_sig(SIGSEGV, 1);
377fad3a
JD
34 /* For segfaults, we want the data from the
35 * sigcontext. In this case, we don't want to mangle
36 * the process registers, so use a static set of
37 * registers. For other signals, the process
38 * registers are OK.
39 */
40 r = &ksig_regs[cpu()];
41 copy_sc(r, sc_ptr);
42 }
43 else r = TASK_REGS(get_current());
1da177e4 44
5d86456d
JD
45 save_user = r->skas.is_user;
46 r->skas.is_user = 0;
c0a689d0
JD
47 if ( sig == SIGFPE || sig == SIGSEGV ||
48 sig == SIGBUS || sig == SIGILL ||
49 sig == SIGTRAP ) {
5d86456d 50 GET_FAULTINFO_FROM_SC(r->skas.faultinfo, sc);
c0a689d0 51 }
1da177e4
LT
52
53 change_sig(SIGUSR1, 1);
1da177e4 54
ea2ba7dc
GS
55 handler = sig_info[sig];
56
57 /* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
58 if (sig != SIGIO && sig != SIGWINCH &&
59 sig != SIGVTALRM && sig != SIGALRM)
60 unblock_signals();
61
5d86456d 62 handler(sig, r);
1da177e4
LT
63
64 errno = save_errno;
5d86456d 65 r->skas.is_user = save_user;
1da177e4 66}