MN10300: Add built-in testing for misalignment handler
Add configurable built-in testing for the MN10300 misalignment handler.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/mn10300/Kconfig.debug b/arch/mn10300/Kconfig.debug
index 524e338..ff80e86 100644
--- a/arch/mn10300/Kconfig.debug
+++ b/arch/mn10300/Kconfig.debug
@@ -15,6 +15,15 @@
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
diff --git a/arch/mn10300/mm/misalignment.c b/arch/mn10300/mm/misalignment.c
index 416c43b..93e09c4 100644
--- a/arch/mn10300/mm/misalignment.c
+++ b/arch/mn10300/mm/misalignment.c
@@ -650,3 +650,164 @@
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 */