Gennady Sharapov | ea2ba7d | 2006-01-08 01:01:31 -0800 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include "kern_util.h" |
Jeff Dike | 4ff83ce | 2007-05-06 14:51:08 -0700 | [diff] [blame] | 9 | #include "as-layout.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include "task.h" |
| 11 | #include "sigcontext.h" |
Bodo Stroesser | c578455 | 2005-05-05 16:15:31 -0700 | [diff] [blame] | 12 | #include "skas.h" |
| 13 | #include "ptrace_user.h" |
| 14 | #include "sysdep/ptrace.h" |
| 15 | #include "sysdep/ptrace_user.h" |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 16 | #include "os.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | void sig_handler_common_skas(int sig, void *sc_ptr) |
| 19 | { |
| 20 | struct sigcontext *sc = sc_ptr; |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame^] | 21 | union uml_pt_regs *r; |
Gennady Sharapov | ea2ba7d | 2006-01-08 01:01:31 -0800 | [diff] [blame] | 22 | void (*handler)(int, union uml_pt_regs *); |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame^] | 23 | int save_user, save_errno = errno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | /* This is done because to allow SIGSEGV to be delivered inside a SEGV |
| 26 | * handler. This can happen in copy_user, and if SEGV is disabled, |
| 27 | * the process will die. |
| 28 | * XXX Figure out why this is better than SA_NODEFER |
| 29 | */ |
| 30 | if(sig == SIGSEGV) |
| 31 | change_sig(SIGSEGV, 1); |
| 32 | |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame^] | 33 | r = TASK_REGS(get_current()); |
| 34 | save_user = r->skas.is_user; |
| 35 | r->skas.is_user = 0; |
Jeff Dike | c0a689d | 2006-01-08 01:01:33 -0800 | [diff] [blame] | 36 | if ( sig == SIGFPE || sig == SIGSEGV || |
| 37 | sig == SIGBUS || sig == SIGILL || |
| 38 | sig == SIGTRAP ) { |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame^] | 39 | GET_FAULTINFO_FROM_SC(r->skas.faultinfo, sc); |
Jeff Dike | c0a689d | 2006-01-08 01:01:33 -0800 | [diff] [blame] | 40 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | change_sig(SIGUSR1, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Gennady Sharapov | ea2ba7d | 2006-01-08 01:01:31 -0800 | [diff] [blame] | 44 | handler = sig_info[sig]; |
| 45 | |
| 46 | /* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */ |
| 47 | if (sig != SIGIO && sig != SIGWINCH && |
| 48 | sig != SIGVTALRM && sig != SIGALRM) |
| 49 | unblock_signals(); |
| 50 | |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame^] | 51 | handler(sig, r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | errno = save_errno; |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame^] | 54 | r->skas.is_user = save_user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Bodo Stroesser | c578455 | 2005-05-05 16:15:31 -0700 | [diff] [blame] | 57 | extern int ptrace_faultinfo; |
| 58 | |
| 59 | void user_signal(int sig, union uml_pt_regs *regs, int pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
Gennady Sharapov | ea2ba7d | 2006-01-08 01:01:31 -0800 | [diff] [blame] | 61 | void (*handler)(int, union uml_pt_regs *); |
Jeff Dike | c0a689d | 2006-01-08 01:01:33 -0800 | [diff] [blame] | 62 | int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) || |
| 63 | (sig == SIGILL) || (sig == SIGTRAP)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Bodo Stroesser | c578455 | 2005-05-05 16:15:31 -0700 | [diff] [blame] | 65 | if (segv) |
| 66 | get_skas_faultinfo(pid, ®s->skas.faultinfo); |
Gennady Sharapov | ea2ba7d | 2006-01-08 01:01:31 -0800 | [diff] [blame] | 67 | |
| 68 | handler = sig_info[sig]; |
| 69 | handler(sig, (union uml_pt_regs *) regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | unblock_signals(); |
| 72 | } |