[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sh / kernel / traps.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 <asm/system.h>

#ifdef CONFIG_BUG
static void handle_BUG(struct pt_regs *regs)
{
	enum bug_trap_type tt;
	tt = report_bug(regs->pc, regs);
	if (tt == BUG_TRAP_TYPE_WARN) {
		regs->pc += instruction_size(regs->pc);
		return;
	}

	die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
}

int is_valid_bugaddr(unsigned long addr)
{
	unsigned short opcode;

	if (addr < PAGE_OFFSET)
		return 0;
	if (probe_kernel_address((u16 *)addr, opcode))
		return 0;

	return opcode == TRAPA_BUG_OPCODE;
}
#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))) {
		opcode_t insn = *(opcode_t *)instruction_pointer(regs);
		if (insn == TRAPA_BUG_OPCODE)
			handle_BUG(regs);
	}
#endif

	force_sig(SIGTRAP, current);
}
Commit	Line	Data
5a4f7c66 PM	1	#include <linux/bug.h>
	2	#include <linux/io.h>
	3	#include <linux/types.h>
	4	#include <linux/kdebug.h>
47a3eb95 PM	5	#include <linux/signal.h>
47a3eb95 PM	6	#include <linux/sched.h>
9a33fc21	7	#include <linux/uaccess.h>
5a4f7c66 PM	8	#include <asm/system.h>
	9
	10	#ifdef CONFIG_BUG
	11	static void handle_BUG(struct pt_regs *regs)
	12	{
	13	enum bug_trap_type tt;
	14	tt = report_bug(regs->pc, regs);
	15	if (tt == BUG_TRAP_TYPE_WARN) {
	16	regs->pc += instruction_size(regs->pc);
	17	return;
	18	}
	19
	20	die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
	21	}
	22
	23	int is_valid_bugaddr(unsigned long addr)
	24	{
9a33fc21 PM	25	unsigned short opcode;
	26
	27	if (addr < PAGE_OFFSET)
	28	return 0;
	29	if (probe_kernel_address((u16 *)addr, opcode))
	30	return 0;
	31
	32	return opcode == TRAPA_BUG_OPCODE;
5a4f7c66 PM	33	}
	34	#endif
	35
	36	/*
	37	* Generic trap handler.
	38	*/
	39	BUILD_TRAP_HANDLER(debug)
	40	{
	41	TRAP_HANDLER_DECL;
	42
	43	/* Rewind */
	44	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
	45
	46	if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
	47	SIGTRAP) == NOTIFY_STOP)
	48	return;
	49
	50	force_sig(SIGTRAP, current);
	51	}
	52
	53	/*
	54	* Special handler for BUG() traps.
	55	*/
	56	BUILD_TRAP_HANDLER(bug)
	57	{
	58	TRAP_HANDLER_DECL;
	59
	60	/* Rewind */
	61	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
	62
	63	if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
	64	SIGTRAP) == NOTIFY_STOP)
	65	return;
	66
	67	#ifdef CONFIG_BUG
	68	if (__kernel_text_address(instruction_pointer(regs))) {
	69	opcode_t insn = (opcode_t )instruction_pointer(regs);
	70	if (insn == TRAPA_BUG_OPCODE)
	71	handle_BUG(regs);
	72	}
	73	#endif
	74
	75	force_sig(SIGTRAP, current);
	76	}