X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=arch%2Fum%2Fos-Linux%2Futil.c;h=ef095436a78c24f669dfc54d1ef8af9eb376687d;hb=364e3a3d8a26aae058cf1c257457ad1f6b1cfe4c;hp=0e771bb04dd215c87b3fde37f979fa0f0c563a0f;hpb=9218b1714949095bff9d9739d80f431d58e561d6;p=linux-2.6-omap-h63xx.git

diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index 0e771bb04dd..ef095436a78 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -29,28 +29,12 @@
 #include "uml-config.h"
 #include "os.h"
 #include "longjmp.h"
+#include "kern_constants.h"
 
 void stack_protections(unsigned long address)
 {
-	int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
-
-	if(mprotect((void *) address, page_size(), prot) < 0)
-		panic("protecting stack failed, errno = %d", errno);
-}
-
-void task_protections(unsigned long address)
-{
-	unsigned long guard = address + page_size();
-	unsigned long stack = guard + page_size();
-	int prot = 0, pages;
-
-#ifdef notdef
-	if(mprotect((void *) stack, page_size(), prot) < 0)
-		panic("protecting guard page failed, errno = %d", errno);
-#endif
-	pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
-	prot = PROT_READ | PROT_WRITE | PROT_EXEC;
-	if(mprotect((void *) stack, pages * page_size(), prot) < 0)
+	if(mprotect((void *) address, UM_THREAD_SIZE,
+		    PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
 		panic("protecting stack failed, errno = %d", errno);
 }
 
@@ -71,7 +55,7 @@ int raw(int fd)
 
 	/* XXX tcsetattr could have applied only some changes
 	 * (and cfmakeraw() is a set of changes) */
-	return(0);
+	return 0;
 }
 
 void setup_machinename(char *machine_out)
@@ -118,3 +102,47 @@ int setjmp_wrapper(void (*proc)(void *, void *), ...)
 	va_end(args);
 	return n;
 }
+
+void os_dump_core(void)
+{
+	int pid;
+
+	signal(SIGSEGV, SIG_DFL);
+
+	/*
+	 * We are about to SIGTERM this entire process group to ensure that
+	 * nothing is around to run after the kernel exits.  The
+	 * kernel wants to abort, not die through SIGTERM, so we
+	 * ignore it here.
+	 */
+
+	signal(SIGTERM, SIG_IGN);
+	kill(0, SIGTERM);
+	/*
+	 * Most of the other processes associated with this UML are
+	 * likely sTopped, so give them a SIGCONT so they see the
+	 * SIGTERM.
+	 */
+	kill(0, SIGCONT);
+
+	/*
+	 * Now, having sent signals to everyone but us, make sure they
+	 * die by ptrace.  Processes can survive what's been done to
+	 * them so far - the mechanism I understand is receiving a
+	 * SIGSEGV and segfaulting immediately upon return.  There is
+	 * always a SIGSEGV pending, and (I'm guessing) signals are
+	 * processed in numeric order so the SIGTERM (signal 15 vs
+	 * SIGSEGV being signal 11) is never handled.
+	 *
+	 * Run a waitpid loop until we get some kind of error.
+	 * Hopefully, it's ECHILD, but there's not a lot we can do if
+	 * it's something else.  Tell os_kill_ptraced_process not to
+	 * wait for the child to report its death because there's
+	 * nothing reasonable to do if that fails.
+	 */
+
+	while ((pid = waitpid(-1, NULL, WNOHANG)) > 0)
+		os_kill_ptraced_process(pid, 0);
+
+	abort();
+}