android_kernel_xiaomi_sm8350/arch/sh/mm/fault-nommu.c
Paul Mundt c71799433a sh: Fix irqflags tracing for SH-3/4 nommu.
We were missing the trace_hardirqs_on() instrumentation in the nommu
case, resync with the MMU version of the page fault handler to have
this behaving consistently. Also explicitly re-enable IRQs now that
the assembly code isn't doing it for us any more.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-08-01 16:19:49 +09:00

65 lines
1.5 KiB
C

/*
* arch/sh/mm/fault-nommu.c
*
* Copyright (C) 2002 - 2007 Paul Mundt
*
* Based on linux/arch/sh/mm/fault.c:
* Copyright (C) 1999 Niibe Yutaka
*
* Released under the terms of the GNU GPL v2.0.
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/hardirq.h>
#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/kgdb.h>
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
* routines.
*/
asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
unsigned long writeaccess,
unsigned long address)
{
trace_hardirqs_on();
local_irq_enable();
#if defined(CONFIG_SH_KGDB)
if (kgdb_nofault && kgdb_bus_err_hook)
kgdb_bus_err_hook();
#endif
/*
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*
*/
if (address < PAGE_SIZE) {
printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
} else {
printk(KERN_ALERT "Unable to handle kernel paging request");
}
printk(" at virtual address %08lx\n", address);
printk(KERN_ALERT "pc = %08lx\n", regs->pc);
die("Oops", regs, writeaccess);
do_exit(SIGKILL);
}
asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
unsigned long writeaccess,
unsigned long address)
{
#if defined(CONFIG_SH_KGDB)
if (kgdb_nofault && kgdb_bus_err_hook)
kgdb_bus_err_hook();
#endif
return (address >= TASK_SIZE);
}