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Commit 3ef6130a authored by Richard Weinberger's avatar Richard Weinberger Committed by Linus Torvalds
Browse files

um: print info about fatal segfaults 



Print a short info about fatal segfaults like other archs do.

Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4ff4d8d3

arch/um/kernel/trap.c

+24 −0
Original line number Diff line number Diff line
@@ -113,6 +113,27 @@ int handle_page_fault(unsigned long address, unsigned long ip, 
	return 0;

}



static void show_segv_info(struct uml_pt_regs *regs)

{

	struct task_struct *tsk = current;

	struct faultinfo *fi = UPT_FAULTINFO(regs);



	if (!unhandled_signal(tsk, SIGSEGV))

		return;



	if (!printk_ratelimit())

		return;



	printk("%s%s[%d]: segfault at %lx ip %p sp %p error %x",

		task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,

		tsk->comm, task_pid_nr(tsk), FAULT_ADDRESS(*fi),

		(void *)UPT_IP(regs), (void *)UPT_SP(regs),

		fi->error_code);



	print_vma_addr(KERN_CONT " in ", UPT_IP(regs));

	printk(KERN_CONT "\n");

}



static void bad_segv(struct faultinfo fi, unsigned long ip)

{

	struct siginfo si;
@@ -141,6 +162,7 @@ void segv_handler(int sig, struct uml_pt_regs *regs) 
	struct faultinfo * fi = UPT_FAULTINFO(regs);



	if (UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)) {

		show_segv_info(regs);

		bad_segv(*fi, UPT_IP(regs));

		return;

	}
@@ -202,6 +224,8 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, 
		      address, ip);

	}



	show_segv_info(regs);



	if (err == -EACCES) {

		si.si_signo = SIGBUS;

		si.si_errno = 0;