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Commit 95320685 authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds
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[PATCH] uml: improve stub debugging 



Add some more debugging information when a stub does something unexpected,
usually segfaulting.  Now, it dumps out the stub's registers as well as the
signal.

Signed-off-by: default avatarJeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent d9b5444e

arch/um/kernel/skas/process.c

+11 −0
Original line number Diff line number Diff line
@@ -69,6 +69,17 @@ void wait_stub_done(int pid, int sig, char * fname) 


        if((n < 0) || !WIFSTOPPED(status) ||

           (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){

		unsigned long regs[FRAME_SIZE];

		if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)

			printk("Failed to get registers from stub, "

			       "errno = %d\n", errno);

		else {

			int i;



			printk("Stub registers -\n");

			for(i = 0; i < FRAME_SIZE; i++)

				printk("\t%d - %lx\n", i, regs[i]);

		}

                panic("%s : failed to wait for SIGUSR1/SIGTRAP, "

                      "pid = %d, n = %d, errno = %d, status = 0x%x\n",

                      fname, pid, n, errno, status);