tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 "user_util.h"
9#include "kern_util.h"
10#include "task.h"
11#include "sigcontext.h"
12#include "skas.h"
13#include "ptrace_user.h"
14#include "sysdep/ptrace.h"
15#include "sysdep/ptrace_user.h"
16#include "os.h"
17
18void sig_handler_common_skas(int sig, void *sc_ptr)
19{
20 struct sigcontext *sc = sc_ptr;
21 struct skas_regs *r;
22 void (*handler)(int, union uml_pt_regs *);
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
45 handler = sig_info[sig];
46
47 /* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
48 if (sig != SIGIO && sig != SIGWINCH &&
49 sig != SIGVTALRM && sig != SIGALRM)
50 unblock_signals();
51
52 handler(sig, (union uml_pt_regs *) r);
53
54 errno = save_errno;
55 r->is_user = save_user;
56}
57
58extern int ptrace_faultinfo;
59
60void user_signal(int sig, union uml_pt_regs *regs, int pid)
61{
62 void (*handler)(int, union uml_pt_regs *);
63 int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
64 (sig == SIGILL) || (sig == SIGTRAP));
65
66 if (segv)
67 get_skas_faultinfo(pid, ®s->skas.faultinfo);
68
69 handler = sig_info[sig];
70 handler(sig, (union uml_pt_regs *) regs);
71
72 unblock_signals();
73}