Commit 9f555889 authored by David Howells's avatar David Howells Committed by Linus Torvalds
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MN10300: Add built-in testing for misalignment handler 



Add configurable built-in testing for the MN10300 misalignment handler.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 31ea24bb

arch/mn10300/Kconfig.debug

+9 −0
Original line number Diff line number Diff line
@@ -15,6 +15,15 @@ config DEBUG_DECOMPRESS_KERNEL 
	  decompressing Linux seeing "Uncompressing Linux... " and

	  "Ok, booting the kernel.\n" on console.



config TEST_MISALIGNMENT_HANDLER

	bool "Run tests on the misalignment handler"

	depends on DEBUG_KERNEL

	default n

	help

	  If you say Y here the kernel will execute a list of misaligned memory

	  accesses to make sure the misalignment handler deals them with

	  correctly.  If it does not, the kernel will throw a BUG.



config KPROBES

	bool "Kprobes"

	depends on DEBUG_KERNEL

arch/mn10300/mm/misalignment.c

+161 −0
Original line number Diff line number Diff line
@@ -650,3 +650,164 @@ static int misalignment_reg(unsigned long *registers, unsigned params, 


	return 1;

}



/*

 * misalignment handler tests

 */

#ifdef CONFIG_TEST_MISALIGNMENT_HANDLER

static u8 __initdata testbuf[512] __attribute__((aligned(16))) = {

	[257] = 0x11,

	[258] = 0x22,

	[259] = 0x33,

	[260] = 0x44,

};



#define ASSERTCMP(X, OP, Y)						\

do {									\

	if (unlikely(!((X) OP (Y)))) {					\

		printk(KERN_ERR "\n");					\

		printk(KERN_ERR "MISALIGN: Assertion failed at line %u\n", \

		       __LINE__);					\

		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\

		       (unsigned long)(X), (unsigned long)(Y));		\

		BUG();							\

	}								\

} while(0)



static int __init test_misalignment(void)

{

	register void *r asm("e0");

	register u32 y asm("e1");

	void *p = testbuf, *q;

	u32 tmp, tmp2, x;



	printk(KERN_NOTICE "==>test_misalignment() [testbuf=%p]\n", p);

	p++;



	printk(KERN_NOTICE "___ MOV (Am),Dn ___\n");

	q = p + 256;

	asm volatile("mov	(%0),%1" : "+a"(q), "=d"(x));

	ASSERTCMP(q, ==, p + 256);

	ASSERTCMP(x, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV (256,Am),Dn ___\n");

	q = p;

	asm volatile("mov	(256,%0),%1" : "+a"(q), "=d"(x));

	ASSERTCMP(q, ==, p);

	ASSERTCMP(x, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV (Di,Am),Dn ___\n");

	tmp = 256;

	q = p;

	asm volatile("mov	(%2,%0),%1" : "+a"(q), "=d"(x), "+d"(tmp));

	ASSERTCMP(q, ==, p);

	ASSERTCMP(x, ==, 0x44332211);

	ASSERTCMP(tmp, ==, 256);



	printk(KERN_NOTICE "___ MOV (256,Rm),Rn ___\n");

	r = p;

	asm volatile("mov	(256,%0),%1" : "+r"(r), "=r"(y));

	ASSERTCMP(r, ==, p);

	ASSERTCMP(y, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV (Rm+),Rn ___\n");

	r = p + 256;

	asm volatile("mov	(%0+),%1" : "+r"(r), "=r"(y));

	ASSERTCMP(r, ==, p + 256 + 4);

	ASSERTCMP(y, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV (Rm+,8),Rn ___\n");

	r = p + 256;

	asm volatile("mov	(%0+,8),%1" : "+r"(r), "=r"(y));

	ASSERTCMP(r, ==, p + 256 + 8);

	ASSERTCMP(y, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV (7,SP),Rn ___\n");

	asm volatile(

		"add	-16,sp		\n"

		"mov	+0x11,%0	\n"

		"movbu	%0,(7,sp)	\n"

		"mov	+0x22,%0	\n"

		"movbu	%0,(8,sp)	\n"

		"mov	+0x33,%0	\n"

		"movbu	%0,(9,sp)	\n"

		"mov	+0x44,%0	\n"

		"movbu	%0,(10,sp)	\n"

		"mov	(7,sp),%1	\n"

		"add	+16,sp		\n"

		: "+a"(q), "=d"(x));

	ASSERTCMP(x, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV (259,SP),Rn ___\n");

	asm volatile(

		"add	-264,sp		\n"

		"mov	+0x11,%0	\n"

		"movbu	%0,(259,sp)	\n"

		"mov	+0x22,%0	\n"

		"movbu	%0,(260,sp)	\n"

		"mov	+0x33,%0	\n"

		"movbu	%0,(261,sp)	\n"

		"mov	+0x55,%0	\n"

		"movbu	%0,(262,sp)	\n"

		"mov	(259,sp),%1	\n"

		"add	+264,sp		\n"

		: "+d"(tmp), "=d"(x));

	ASSERTCMP(x, ==, 0x55332211);



	printk(KERN_NOTICE "___ MOV (260,SP),Rn ___\n");

	asm volatile(

		"add	-264,sp		\n"

		"mov	+0x11,%0	\n"

		"movbu	%0,(260,sp)	\n"

		"mov	+0x22,%0	\n"

		"movbu	%0,(261,sp)	\n"

		"mov	+0x33,%0	\n"

		"movbu	%0,(262,sp)	\n"

		"mov	+0x55,%0	\n"

		"movbu	%0,(263,sp)	\n"

		"mov	(260,sp),%1	\n"

		"add	+264,sp		\n"

		: "+d"(tmp), "=d"(x));

	ASSERTCMP(x, ==, 0x55332211);





	printk(KERN_NOTICE "___ MOV_LNE ___\n");

	tmp = 1;

	tmp2 = 2;

	q = p + 256;

	asm volatile(

		"setlb			\n"

		"mov	%2,%3		\n"

		"mov	%1,%2		\n"

		"cmp	+0,%1		\n"

		"mov_lne	(%0+,4),%1"

		: "+r"(q), "+d"(tmp), "+d"(tmp2), "=d"(x)

		:

		: "cc");

	ASSERTCMP(q, ==, p + 256 + 12);

	ASSERTCMP(x, ==, 0x44332211);



	printk(KERN_NOTICE "___ MOV in SETLB ___\n");

	tmp = 1;

	tmp2 = 2;

	q = p + 256;

	asm volatile(

		"setlb			\n"

		"mov	%1,%3		\n"

		"mov	(%0+),%1	\n"

		"cmp	+0,%1		\n"

		"lne			"

		: "+a"(q), "+d"(tmp), "+d"(tmp2), "=d"(x)

		:

		: "cc");



	ASSERTCMP(q, ==, p + 256 + 8);

	ASSERTCMP(x, ==, 0x44332211);



	printk(KERN_NOTICE "<==test_misalignment()\n");

	return 0;

}



arch_initcall(test_misalignment);



#endif /* CONFIG_TEST_MISALIGNMENT_HANDLER */