731ba3301d
This plugs in support for NMI counting per-CPU via irq_cpustat_t. Modelled after the x86 implementation. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
117 lines
2.2 KiB
C
117 lines
2.2 KiB
C
#include <linux/bug.h>
|
|
#include <linux/io.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/hardirq.h>
|
|
#include <asm/unwinder.h>
|
|
#include <asm/system.h>
|
|
|
|
#ifdef CONFIG_BUG
|
|
void handle_BUG(struct pt_regs *regs)
|
|
{
|
|
const struct bug_entry *bug;
|
|
unsigned long bugaddr = regs->pc;
|
|
enum bug_trap_type tt;
|
|
|
|
if (!is_valid_bugaddr(bugaddr))
|
|
goto invalid;
|
|
|
|
bug = find_bug(bugaddr);
|
|
|
|
/* Switch unwinders when unwind_stack() is called */
|
|
if (bug->flags & BUGFLAG_UNWINDER)
|
|
unwinder_faulted = 1;
|
|
|
|
tt = report_bug(bugaddr, regs);
|
|
if (tt == BUG_TRAP_TYPE_WARN) {
|
|
regs->pc += instruction_size(bugaddr);
|
|
return;
|
|
}
|
|
|
|
invalid:
|
|
die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
|
|
}
|
|
|
|
int is_valid_bugaddr(unsigned long addr)
|
|
{
|
|
insn_size_t opcode;
|
|
|
|
if (addr < PAGE_OFFSET)
|
|
return 0;
|
|
if (probe_kernel_address((insn_size_t *)addr, opcode))
|
|
return 0;
|
|
if (opcode == TRAPA_BUG_OPCODE)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Generic trap handler.
|
|
*/
|
|
BUILD_TRAP_HANDLER(debug)
|
|
{
|
|
TRAP_HANDLER_DECL;
|
|
|
|
/* Rewind */
|
|
regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
|
|
|
|
if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
|
|
SIGTRAP) == NOTIFY_STOP)
|
|
return;
|
|
|
|
force_sig(SIGTRAP, current);
|
|
}
|
|
|
|
/*
|
|
* Special handler for BUG() traps.
|
|
*/
|
|
BUILD_TRAP_HANDLER(bug)
|
|
{
|
|
TRAP_HANDLER_DECL;
|
|
|
|
/* Rewind */
|
|
regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
|
|
|
|
if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
|
|
SIGTRAP) == NOTIFY_STOP)
|
|
return;
|
|
|
|
#ifdef CONFIG_BUG
|
|
if (__kernel_text_address(instruction_pointer(regs))) {
|
|
insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
|
|
if (insn == TRAPA_BUG_OPCODE)
|
|
handle_BUG(regs);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
force_sig(SIGTRAP, current);
|
|
}
|
|
|
|
BUILD_TRAP_HANDLER(nmi)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
TRAP_HANDLER_DECL;
|
|
|
|
nmi_enter();
|
|
nmi_count(cpu)++;
|
|
|
|
switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
|
|
case NOTIFY_OK:
|
|
case NOTIFY_STOP:
|
|
break;
|
|
case NOTIFY_BAD:
|
|
die("Fatal Non-Maskable Interrupt", regs, SIGINT);
|
|
default:
|
|
printk(KERN_ALERT "Got NMI, but nobody cared. Ignoring...\n");
|
|
break;
|
|
}
|
|
|
|
nmi_exit();
|
|
}
|