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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: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells
Linus Torvalds
parent
31ea24bba7
commit
9f55588968
2 changed files with 170 additions and 0 deletions
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@ -15,6 +15,15 @@ config DEBUG_DECOMPRESS_KERNEL
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decompressing Linux seeing "Uncompressing Linux... " and
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"Ok, booting the kernel.\n" on console.
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config TEST_MISALIGNMENT_HANDLER
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bool "Run tests on the misalignment handler"
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depends on DEBUG_KERNEL
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default n
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help
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If you say Y here the kernel will execute a list of misaligned memory
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accesses to make sure the misalignment handler deals them with
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correctly. If it does not, the kernel will throw a BUG.
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config KPROBES
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bool "Kprobes"
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depends on DEBUG_KERNEL
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@ -650,3 +650,164 @@ static int misalignment_reg(unsigned long *registers, unsigned params,
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return 1;
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}
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/*
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* misalignment handler tests
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*/
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#ifdef CONFIG_TEST_MISALIGNMENT_HANDLER
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static u8 __initdata testbuf[512] __attribute__((aligned(16))) = {
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[257] = 0x11,
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[258] = 0x22,
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[259] = 0x33,
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[260] = 0x44,
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};
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#define ASSERTCMP(X, OP, Y) \
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do { \
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if (unlikely(!((X) OP (Y)))) { \
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printk(KERN_ERR "\n"); \
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printk(KERN_ERR "MISALIGN: Assertion failed at line %u\n", \
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__LINE__); \
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printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
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(unsigned long)(X), (unsigned long)(Y)); \
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BUG(); \
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} \
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} while(0)
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static int __init test_misalignment(void)
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{
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register void *r asm("e0");
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register u32 y asm("e1");
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void *p = testbuf, *q;
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u32 tmp, tmp2, x;
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printk(KERN_NOTICE "==>test_misalignment() [testbuf=%p]\n", p);
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p++;
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printk(KERN_NOTICE "___ MOV (Am),Dn ___\n");
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q = p + 256;
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asm volatile("mov (%0),%1" : "+a"(q), "=d"(x));
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ASSERTCMP(q, ==, p + 256);
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ASSERTCMP(x, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV (256,Am),Dn ___\n");
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q = p;
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asm volatile("mov (256,%0),%1" : "+a"(q), "=d"(x));
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ASSERTCMP(q, ==, p);
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ASSERTCMP(x, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV (Di,Am),Dn ___\n");
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tmp = 256;
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q = p;
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asm volatile("mov (%2,%0),%1" : "+a"(q), "=d"(x), "+d"(tmp));
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ASSERTCMP(q, ==, p);
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ASSERTCMP(x, ==, 0x44332211);
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ASSERTCMP(tmp, ==, 256);
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printk(KERN_NOTICE "___ MOV (256,Rm),Rn ___\n");
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r = p;
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asm volatile("mov (256,%0),%1" : "+r"(r), "=r"(y));
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ASSERTCMP(r, ==, p);
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ASSERTCMP(y, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV (Rm+),Rn ___\n");
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r = p + 256;
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asm volatile("mov (%0+),%1" : "+r"(r), "=r"(y));
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ASSERTCMP(r, ==, p + 256 + 4);
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ASSERTCMP(y, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV (Rm+,8),Rn ___\n");
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r = p + 256;
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asm volatile("mov (%0+,8),%1" : "+r"(r), "=r"(y));
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ASSERTCMP(r, ==, p + 256 + 8);
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ASSERTCMP(y, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV (7,SP),Rn ___\n");
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asm volatile(
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"add -16,sp \n"
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"mov +0x11,%0 \n"
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"movbu %0,(7,sp) \n"
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"mov +0x22,%0 \n"
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"movbu %0,(8,sp) \n"
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"mov +0x33,%0 \n"
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"movbu %0,(9,sp) \n"
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"mov +0x44,%0 \n"
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"movbu %0,(10,sp) \n"
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"mov (7,sp),%1 \n"
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"add +16,sp \n"
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: "+a"(q), "=d"(x));
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ASSERTCMP(x, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV (259,SP),Rn ___\n");
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asm volatile(
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"add -264,sp \n"
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"mov +0x11,%0 \n"
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"movbu %0,(259,sp) \n"
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"mov +0x22,%0 \n"
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"movbu %0,(260,sp) \n"
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"mov +0x33,%0 \n"
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"movbu %0,(261,sp) \n"
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"mov +0x55,%0 \n"
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"movbu %0,(262,sp) \n"
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"mov (259,sp),%1 \n"
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"add +264,sp \n"
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: "+d"(tmp), "=d"(x));
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ASSERTCMP(x, ==, 0x55332211);
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printk(KERN_NOTICE "___ MOV (260,SP),Rn ___\n");
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asm volatile(
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"add -264,sp \n"
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"mov +0x11,%0 \n"
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"movbu %0,(260,sp) \n"
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"mov +0x22,%0 \n"
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"movbu %0,(261,sp) \n"
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"mov +0x33,%0 \n"
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"movbu %0,(262,sp) \n"
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"mov +0x55,%0 \n"
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"movbu %0,(263,sp) \n"
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"mov (260,sp),%1 \n"
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"add +264,sp \n"
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: "+d"(tmp), "=d"(x));
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ASSERTCMP(x, ==, 0x55332211);
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printk(KERN_NOTICE "___ MOV_LNE ___\n");
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tmp = 1;
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tmp2 = 2;
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q = p + 256;
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asm volatile(
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"setlb \n"
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"mov %2,%3 \n"
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"mov %1,%2 \n"
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"cmp +0,%1 \n"
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"mov_lne (%0+,4),%1"
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: "+r"(q), "+d"(tmp), "+d"(tmp2), "=d"(x)
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:
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: "cc");
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ASSERTCMP(q, ==, p + 256 + 12);
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ASSERTCMP(x, ==, 0x44332211);
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printk(KERN_NOTICE "___ MOV in SETLB ___\n");
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tmp = 1;
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tmp2 = 2;
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q = p + 256;
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asm volatile(
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"setlb \n"
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"mov %1,%3 \n"
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"mov (%0+),%1 \n"
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"cmp +0,%1 \n"
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"lne "
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: "+a"(q), "+d"(tmp), "+d"(tmp2), "=d"(x)
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:
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: "cc");
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ASSERTCMP(q, ==, p + 256 + 8);
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ASSERTCMP(x, ==, 0x44332211);
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printk(KERN_NOTICE "<==test_misalignment()\n");
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return 0;
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}
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arch_initcall(test_misalignment);
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#endif /* CONFIG_TEST_MISALIGNMENT_HANDLER */
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