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 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 18 | static struct uml_pt_regs ksig_regs[UM_NR_CPUS]; |
Jeff Dike | 377fad3 | 2007-05-06 14:51:25 -0700 | [diff] [blame] | 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | void sig_handler_common_skas(int sig, void *sc_ptr) |
| 21 | { |
| 22 | struct sigcontext *sc = sc_ptr; |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 23 | struct uml_pt_regs *r; |
| 24 | void (*handler)(int, struct uml_pt_regs *); |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame] | 25 | int save_user, save_errno = errno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Jeff Dike | 377fad3 | 2007-05-06 14:51:25 -0700 | [diff] [blame] | 32 | if(sig == SIGSEGV) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | change_sig(SIGSEGV, 1); |
Jeff Dike | 377fad3 | 2007-05-06 14:51:25 -0700 | [diff] [blame] | 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()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 45 | save_user = r->is_user; |
| 46 | r->is_user = 0; |
Jeff Dike | c0a689d | 2006-01-08 01:01:33 -0800 | [diff] [blame] | 47 | if ( sig == SIGFPE || sig == SIGSEGV || |
| 48 | sig == SIGBUS || sig == SIGILL || |
| 49 | sig == SIGTRAP ) { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 50 | GET_FAULTINFO_FROM_SC(r->faultinfo, sc); |
Jeff Dike | c0a689d | 2006-01-08 01:01:33 -0800 | [diff] [blame] | 51 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | change_sig(SIGUSR1, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Gennady Sharapov | ea2ba7d | 2006-01-08 01:01:31 -0800 | [diff] [blame] | 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 | |
Jeff Dike | 5d86456 | 2007-05-06 14:51:24 -0700 | [diff] [blame] | 62 | handler(sig, r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | errno = save_errno; |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 65 | r->is_user = save_user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |