[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
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)
{
	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 || opcode == TRAPA_UNWINDER_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);
}
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
b344e24a	11	void handle_BUG(struct pt_regs *regs)
5a4f7c66 PM	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	{
2bcfffa4	25	insn_size_t opcode;
9a33fc21 PM	26
	27	if (addr < PAGE_OFFSET)
	28	return 0;
2bcfffa4	29	if (probe_kernel_address((insn_size_t *)addr, opcode))
9a33fc21 PM	30	return 0;
9a33fc21 PM	31
b344e24a MF	32	if (opcode == TRAPA_BUG_OPCODE \|\| opcode == TRAPA_UNWINDER_BUG_OPCODE)
	33	return 1;
	34
	35	return 0;
5a4f7c66 PM	36	}
	37	#endif
	38
	39	/*
	40	* Generic trap handler.
	41	*/
	42	BUILD_TRAP_HANDLER(debug)
	43	{
	44	TRAP_HANDLER_DECL;
	45
	46	/* Rewind */
	47	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
	48
	49	if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
	50	SIGTRAP) == NOTIFY_STOP)
	51	return;
	52
	53	force_sig(SIGTRAP, current);
	54	}
	55
	56	/*
	57	* Special handler for BUG() traps.
	58	*/
	59	BUILD_TRAP_HANDLER(bug)
	60	{
	61	TRAP_HANDLER_DECL;
	62
	63	/* Rewind */
	64	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
	65
	66	if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
	67	SIGTRAP) == NOTIFY_STOP)
	68	return;
	69
	70	#ifdef CONFIG_BUG
	71	if (__kernel_text_address(instruction_pointer(regs))) {
2bcfffa4	72	insn_size_t insn = (insn_size_t )instruction_pointer(regs);
5a4f7c66 PM	73	if (insn == TRAPA_BUG_OPCODE)
5a4f7c66 PM	74	handle_BUG(regs);
0ec39885	75	return;
5a4f7c66 PM	76	}
	77	#endif
	78
	79	force_sig(SIGTRAP, current);
	80	}