diff options
Diffstat (limited to 'include/asm-frv/unaligned.h')
| -rw-r--r-- | include/asm-frv/unaligned.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/include/asm-frv/unaligned.h b/include/asm-frv/unaligned.h new file mode 100644 index 00000000000..a0d199bf01d --- /dev/null +++ b/include/asm-frv/unaligned.h @@ -0,0 +1,203 @@ +/* unaligned.h: unaligned access handler + * + * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _ASM_UNALIGNED_H +#define _ASM_UNALIGNED_H + +#include <linux/config.h> + +/* + * Unaligned accesses on uClinux can't be performed in a fault handler - the + * CPU detects them as imprecise exceptions making this impossible. + * + * With the FR451, however, they are precise, and so we used to fix them up in + * the memory access fault handler. However, instruction bundling make this + * impractical. So, now we fall back to using memcpy. + */ +#ifdef CONFIG_MMU + +/* + * The asm statement in the macros below is a way to get GCC to copy a + * value from one variable to another without having any clue it's + * actually doing so, so that it won't have any idea that the values + * in the two variables are related. + */ + +#define get_unaligned(ptr) ({ \ + typeof((*(ptr))) __x; \ + void *__ptrcopy; \ + asm("" : "=r" (__ptrcopy) : "0" (ptr)); \ + memcpy(&__x, __ptrcopy, sizeof(*(ptr))); \ + __x; \ +}) + +#define put_unaligned(val, ptr) ({ \ + typeof((*(ptr))) __x = (val); \ + void *__ptrcopy; \ + asm("" : "=r" (__ptrcopy) : "0" (ptr)); \ + memcpy(__ptrcopy, &__x, sizeof(*(ptr))); \ +}) + +extern int handle_misalignment(unsigned long esr0, unsigned long ear0, unsigned long epcr0); + +#else + +#define get_unaligned(ptr) \ +({ \ + typeof(*(ptr)) x; \ + const char *__p = (const char *) (ptr); \ + \ + switch (sizeof(x)) { \ + case 1: \ + x = *(ptr); \ + break; \ + case 2: \ + { \ + uint8_t a; \ + asm(" ldub%I2 %M2,%0 \n" \ + " ldub%I3.p %M3,%1 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%1,%0 \n" \ + : "=&r"(x), "=&r"(a) \ + : "m"(__p[0]), "m"(__p[1]) \ + ); \ + break; \ + } \ + \ + case 4: \ + { \ + uint8_t a; \ + asm(" ldub%I2 %M2,%0 \n" \ + " ldub%I3.p %M3,%1 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%1,%0 \n" \ + " ldub%I4.p %M4,%1 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%1,%0 \n" \ + " ldub%I5.p %M5,%1 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%1,%0 \n" \ + : "=&r"(x), "=&r"(a) \ + : "m"(__p[0]), "m"(__p[1]), "m"(__p[2]), "m"(__p[3]) \ + ); \ + break; \ + } \ + \ + case 8: \ + { \ + union { uint64_t x; u32 y[2]; } z; \ + uint8_t a; \ + asm(" ldub%I3 %M3,%0 \n" \ + " ldub%I4.p %M4,%2 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%2,%0 \n" \ + " ldub%I5.p %M5,%2 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%2,%0 \n" \ + " ldub%I6.p %M6,%2 \n" \ + " slli %0,#8,%0 \n" \ + " or %0,%2,%0 \n" \ + " ldub%I7 %M7,%1 \n" \ + " ldub%I8.p %M8,%2 \n" \ + " slli %1,#8,%1 \n" \ + " or %1,%2,%1 \n" \ + " ldub%I9.p %M9,%2 \n" \ + " slli %1,#8,%1 \n" \ + " or %1,%2,%1 \n" \ + " ldub%I10.p %M10,%2 \n" \ + " slli %1,#8,%1 \n" \ + " or %1,%2,%1 \n" \ + : "=&r"(z.y[0]), "=&r"(z.y[1]), "=&r"(a) \ + : "m"(__p[0]), "m"(__p[1]), "m"(__p[2]), "m"(__p[3]), \ + "m"(__p[4]), "m"(__p[5]), "m"(__p[6]), "m"(__p[7]) \ + ); \ + x = z.x; \ + break; \ + } \ + \ + default: \ + x = 0; \ + BUG(); \ + break; \ + } \ + \ + x; \ +}) + +#define put_unaligned(val, ptr) \ +do { \ + char *__p = (char *) (ptr); \ + int x; \ + \ + switch (sizeof(*ptr)) { \ + case 2: \ + { \ + asm(" stb%I1.p %0,%M1 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I2 %0,%M2 \n" \ + : "=r"(x), "=m"(__p[1]), "=m"(__p[0]) \ + : "0"(val) \ + ); \ + break; \ + } \ + \ + case 4: \ + { \ + asm(" stb%I1.p %0,%M1 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I2.p %0,%M2 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I3.p %0,%M3 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I4 %0,%M4 \n" \ + : "=r"(x), "=m"(__p[3]), "=m"(__p[2]), "=m"(__p[1]), "=m"(__p[0]) \ + : "0"(val) \ + ); \ + break; \ + } \ + \ + case 8: \ + { \ + uint32_t __high, __low; \ + __high = (uint64_t)val >> 32; \ + __low = val & 0xffffffff; \ + asm(" stb%I2.p %0,%M2 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I3.p %0,%M3 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I4.p %0,%M4 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I5.p %0,%M5 \n" \ + " srli %0,#8,%0 \n" \ + " stb%I6.p %1,%M6 \n" \ + " srli %1,#8,%1 \n" \ + " stb%I7.p %1,%M7 \n" \ + " srli %1,#8,%1 \n" \ + " stb%I8.p %1,%M8 \n" \ + " srli %1,#8,%1 \n" \ + " stb%I9 %1,%M9 \n" \ + : "=&r"(__low), "=&r"(__high), "=m"(__p[7]), "=m"(__p[6]), \ + "=m"(__p[5]), "=m"(__p[4]), "=m"(__p[3]), "=m"(__p[2]), \ + "=m"(__p[1]), "=m"(__p[0]) \ + : "0"(__low), "1"(__high) \ + ); \ + break; \ + } \ + \ + default: \ + *(ptr) = (val); \ + break; \ + } \ +} while(0) + +#endif + +#endif |