2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
15 #include <sys/utsname.h>
16 #include "kern_constants.h"
20 void stack_protections(unsigned long address)
22 if (mprotect((void *) address, UM_THREAD_SIZE,
23 PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
24 panic("protecting stack failed, errno = %d", errno);
32 CATCH_EINTR(err = tcgetattr(fd, &tt));
38 CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
43 * XXX tcsetattr could have applied only some changes
44 * (and cfmakeraw() is a set of changes)
49 void setup_machinename(char *machine_out)
54 #ifdef UML_CONFIG_UML_X86
55 # ifndef UML_CONFIG_64BIT
56 if (!strcmp(host.machine, "x86_64")) {
57 strcpy(machine_out, "i686");
61 if (!strcmp(host.machine, "i686")) {
62 strcpy(machine_out, "x86_64");
67 strcpy(machine_out, host.machine);
70 void setup_hostinfo(char *buf, int len)
75 snprintf(buf, len, "%s %s %s %s %s", host.sysname, host.nodename,
76 host.release, host.version, host.machine);
80 * We cannot use glibc's abort(). It makes use of tgkill() which
81 * has no effect within UML's kernel threads.
82 * After that glibc would execute an invalid instruction to kill
83 * the calling process and UML crashes with SIGSEGV.
85 static inline void __attribute__ ((noreturn)) uml_abort(void)
91 if (!sigemptyset(&sig) && !sigaddset(&sig, SIGABRT))
92 sigprocmask(SIG_UNBLOCK, &sig, 0);
95 if (kill(getpid(), SIGABRT) < 0)
99 void os_dump_core(void)
103 signal(SIGSEGV, SIG_DFL);
106 * We are about to SIGTERM this entire process group to ensure that
107 * nothing is around to run after the kernel exits. The
108 * kernel wants to abort, not die through SIGTERM, so we
112 signal(SIGTERM, SIG_IGN);
115 * Most of the other processes associated with this UML are
116 * likely sTopped, so give them a SIGCONT so they see the
122 * Now, having sent signals to everyone but us, make sure they
123 * die by ptrace. Processes can survive what's been done to
124 * them so far - the mechanism I understand is receiving a
125 * SIGSEGV and segfaulting immediately upon return. There is
126 * always a SIGSEGV pending, and (I'm guessing) signals are
127 * processed in numeric order so the SIGTERM (signal 15 vs
128 * SIGSEGV being signal 11) is never handled.
130 * Run a waitpid loop until we get some kind of error.
131 * Hopefully, it's ECHILD, but there's not a lot we can do if
132 * it's something else. Tell os_kill_ptraced_process not to
133 * wait for the child to report its death because there's
134 * nothing reasonable to do if that fails.
137 while ((pid = waitpid(-1, NULL, WNOHANG | __WALL)) > 0)
138 os_kill_ptraced_process(pid, 0);
143 void um_early_printk(const char *s, unsigned int n)
145 printf("%.*s", n, s);