| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 58 | if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){ |
| 59 | bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), |
| 60 | UPT_FAULT_WRITE(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 = UPT_FAULT_ADDR(regs); |
| 68 | segfault_record[index].pid = os_getpid(); |
| 69 | segfault_record[index].is_write = UPT_FAULT_WRITE(regs); |
| 70 | segfault_record[index].sp = UPT_SP(regs); |
| 71 | segfault_record[index].is_user = UPT_IS_USER(regs); |
| 72 | segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs), |
| 73 | UPT_IS_USER(regs), regs); |
| 74 | } |
| 75 | |
| 76 | void usr2_handler(int sig, union uml_pt_regs *regs) |
| 77 | { |
| 78 | CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0); |
| 79 | } |
| 80 | |
| 81 | struct signal_info sig_info[] = { |
| 82 | [ SIGTRAP ] { .handler = relay_signal, |
| 83 | .is_irq = 0 }, |
| 84 | [ SIGFPE ] { .handler = relay_signal, |
| 85 | .is_irq = 0 }, |
| 86 | [ SIGILL ] { .handler = relay_signal, |
| 87 | .is_irq = 0 }, |
| 88 | [ SIGWINCH ] { .handler = winch, |
| 89 | .is_irq = 1 }, |
| 90 | [ SIGBUS ] { .handler = bus_handler, |
| 91 | .is_irq = 0 }, |
| 92 | [ SIGSEGV] { .handler = segv_handler, |
| 93 | .is_irq = 0 }, |
| 94 | [ SIGIO ] { .handler = sigio_handler, |
| 95 | .is_irq = 1 }, |
| 96 | [ SIGVTALRM ] { .handler = timer_handler, |
| 97 | .is_irq = 1 }, |
| 98 | [ SIGALRM ] { .handler = timer_handler, |
| 99 | .is_irq = 1 }, |
| 100 | [ SIGUSR2 ] { .handler = usr2_handler, |
| 101 | .is_irq = 0 }, |
| 102 | }; |
| 103 | |
| 104 | void do_longjmp(void *b, int val) |
| 105 | { |
| 106 | sigjmp_buf *buf = b; |
| 107 | |
| 108 | siglongjmp(*buf, val); |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 113 | * Emacs will notice this stuff at the end of the file and automatically |
| 114 | * adjust the settings for this buffer only. This must remain at the end |
| 115 | * of the file. |
| 116 | * --------------------------------------------------------------------------- |
| 117 | * Local variables: |
| 118 | * c-file-style: "linux" |
| 119 | * End: |
| 120 | */ |