Merge upstream 2.6.13-rc3 into ieee80211 branch of netdev-2.6.
[deliverable/linux.git] / arch / um / kernel / skas / trap_user.c
1 /*
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>
8 #include "signal_user.h"
9 #include "user_util.h"
10 #include "kern_util.h"
11 #include "task.h"
12 #include "sigcontext.h"
13 #include "skas.h"
14 #include "ptrace_user.h"
15 #include "sysdep/ptrace.h"
16 #include "sysdep/ptrace_user.h"
17
18 void sig_handler_common_skas(int sig, void *sc_ptr)
19 {
20 struct sigcontext *sc = sc_ptr;
21 struct skas_regs *r;
22 struct signal_info *info;
23 int save_errno = errno;
24 int save_user;
25
26 /* This is done because to allow SIGSEGV to be delivered inside a SEGV
27 * handler. This can happen in copy_user, and if SEGV is disabled,
28 * the process will die.
29 * XXX Figure out why this is better than SA_NODEFER
30 */
31 if(sig == SIGSEGV)
32 change_sig(SIGSEGV, 1);
33
34 r = &TASK_REGS(get_current())->skas;
35 save_user = r->is_user;
36 r->is_user = 0;
37 if ( sig == SIGFPE || sig == SIGSEGV ||
38 sig == SIGBUS || sig == SIGILL ||
39 sig == SIGTRAP ) {
40 GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
41 }
42
43 change_sig(SIGUSR1, 1);
44 info = &sig_info[sig];
45 if(!info->is_irq) unblock_signals();
46
47 (*info->handler)(sig, (union uml_pt_regs *) r);
48
49 errno = save_errno;
50 r->is_user = save_user;
51 }
52
53 extern int ptrace_faultinfo;
54
55 void user_signal(int sig, union uml_pt_regs *regs, int pid)
56 {
57 struct signal_info *info;
58 int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
59 (sig == SIGILL) || (sig == SIGTRAP));
60
61 regs->skas.is_user = 1;
62 if (segv)
63 get_skas_faultinfo(pid, &regs->skas.faultinfo);
64 info = &sig_info[sig];
65 (*info->handler)(sig, regs);
66
67 unblock_signals();
68 }
69
70 /*
71 * Overrides for Emacs so that we follow Linus's tabbing style.
72 * Emacs will notice this stuff at the end of the file and automatically
73 * adjust the settings for this buffer only. This must remain at the end
74 * of the file.
75 * ---------------------------------------------------------------------------
76 * Local variables:
77 * c-file-style: "linux"
78 * End:
79 */
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