Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / arch / um / kernel / trap_user.c
1 /* 
2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
6 #include <stdlib.h>
7 #include <errno.h>
8 #include <setjmp.h>
9 #include <signal.h>
10 #include <sys/time.h>
11 #include <sys/wait.h>
12 #include <asm/page.h>
13 #include <asm/unistd.h>
14 #include <asm/ptrace.h>
15 #include "init.h"
16 #include "sysdep/ptrace.h"
17 #include "sigcontext.h"
18 #include "sysdep/sigcontext.h"
19 #include "irq_user.h"
20 #include "signal_user.h"
21 #include "time_user.h"
22 #include "task.h"
23 #include "mode.h"
24 #include "choose-mode.h"
25 #include "kern_util.h"
26 #include "user_util.h"
27 #include "os.h"
28
29 void kill_child_dead(int pid)
30 {
31         kill(pid, SIGKILL);
32         kill(pid, SIGCONT);
33         do {
34                 int n;
35                 CATCH_EINTR(n = waitpid(pid, NULL, 0));
36                 if (n > 0)
37                         kill(pid, SIGCONT);
38                 else
39                         break;
40         } while(1);
41 }
42
43 /* Unlocked - don't care if this is a bit off */
44 int nsegfaults = 0;
45
46 struct {
47         unsigned long address;
48         int is_write;
49         int pid;
50         unsigned long sp;
51         int is_user;
52 } segfault_record[1024];
53
54 void segv_handler(int sig, union uml_pt_regs *regs)
55 {
56         int index, max;
57         struct faultinfo * fi = UPT_FAULTINFO(regs);
58
59         if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
60                 bad_segv(*fi, UPT_IP(regs));
61                 return;
62         }
63         max = sizeof(segfault_record)/sizeof(segfault_record[0]);
64         index = next_trap_index(max);
65
66         nsegfaults++;
67         segfault_record[index].address = FAULT_ADDRESS(*fi);
68         segfault_record[index].pid = os_getpid();
69         segfault_record[index].is_write = FAULT_WRITE(*fi);
70         segfault_record[index].sp = UPT_SP(regs);
71         segfault_record[index].is_user = UPT_IS_USER(regs);
72         segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
73 }
74
75 void usr2_handler(int sig, union uml_pt_regs *regs)
76 {
77         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
78 }
79
80 struct signal_info sig_info[] = {
81         [ SIGTRAP ] { .handler          = relay_signal,
82                       .is_irq           = 0 },
83         [ SIGFPE ] { .handler           = relay_signal,
84                      .is_irq            = 0 },
85         [ SIGILL ] { .handler           = relay_signal,
86                      .is_irq            = 0 },
87         [ SIGWINCH ] { .handler         = winch,
88                        .is_irq          = 1 },
89         [ SIGBUS ] { .handler           = bus_handler,
90                      .is_irq            = 0 },
91         [ SIGSEGV] { .handler           = segv_handler,
92                      .is_irq            = 0 },
93         [ SIGIO ] { .handler            = sigio_handler,
94                     .is_irq             = 1 },
95         [ SIGVTALRM ] { .handler        = timer_handler,
96                         .is_irq         = 1 },
97         [ SIGALRM ] { .handler          = timer_handler,
98                       .is_irq           = 1 },
99         [ SIGUSR2 ] { .handler          = usr2_handler,
100                       .is_irq           = 0 },
101 };
102
103 void do_longjmp(void *b, int val)
104 {
105         sigjmp_buf *buf = b;
106
107         siglongjmp(*buf, val);
108 }
109
110 /*
111  * Overrides for Emacs so that we follow Linus's tabbing style.
112  * Emacs will notice this stuff at the end of the file and automatically
113  * adjust the settings for this buffer only.  This must remain at the end
114  * of the file.
115  * ---------------------------------------------------------------------------
116  * Local variables:
117  * c-file-style: "linux"
118  * End:
119  */