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Diffstat (limited to 'include/exec/memop.h')
| -rw-r--r-- | include/exec/memop.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/include/exec/memop.h b/include/exec/memop.h new file mode 100644 index 0000000000..7262ca3dfd --- /dev/null +++ b/include/exec/memop.h @@ -0,0 +1,110 @@ +/* + * Constants for memory operations + * + * Authors: + * Richard Henderson <rth@twiddle.net> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#ifndef MEMOP_H +#define MEMOP_H + +typedef enum MemOp { + MO_8 = 0, + MO_16 = 1, + MO_32 = 2, + MO_64 = 3, + MO_SIZE = 3, /* Mask for the above. */ + + MO_SIGN = 4, /* Sign-extended, otherwise zero-extended. */ + + MO_BSWAP = 8, /* Host reverse endian. */ +#ifdef HOST_WORDS_BIGENDIAN + MO_LE = MO_BSWAP, + MO_BE = 0, +#else + MO_LE = 0, + MO_BE = MO_BSWAP, +#endif +#ifdef NEED_CPU_H +#ifdef TARGET_WORDS_BIGENDIAN + MO_TE = MO_BE, +#else + MO_TE = MO_LE, +#endif +#endif + + /* + * MO_UNALN accesses are never checked for alignment. + * MO_ALIGN accesses will result in a call to the CPU's + * do_unaligned_access hook if the guest address is not aligned. + * The default depends on whether the target CPU defines + * TARGET_ALIGNED_ONLY. + * + * Some architectures (e.g. ARMv8) need the address which is aligned + * to a size more than the size of the memory access. + * Some architectures (e.g. SPARCv9) need an address which is aligned, + * but less strictly than the natural alignment. + * + * MO_ALIGN supposes the alignment size is the size of a memory access. + * + * There are three options: + * - unaligned access permitted (MO_UNALN). + * - an alignment to the size of an access (MO_ALIGN); + * - an alignment to a specified size, which may be more or less than + * the access size (MO_ALIGN_x where 'x' is a size in bytes); + */ + MO_ASHIFT = 4, + MO_AMASK = 7 << MO_ASHIFT, +#ifdef NEED_CPU_H +#ifdef TARGET_ALIGNED_ONLY + MO_ALIGN = 0, + MO_UNALN = MO_AMASK, +#else + MO_ALIGN = MO_AMASK, + MO_UNALN = 0, +#endif +#endif + MO_ALIGN_2 = 1 << MO_ASHIFT, + MO_ALIGN_4 = 2 << MO_ASHIFT, + MO_ALIGN_8 = 3 << MO_ASHIFT, + MO_ALIGN_16 = 4 << MO_ASHIFT, + MO_ALIGN_32 = 5 << MO_ASHIFT, + MO_ALIGN_64 = 6 << MO_ASHIFT, + + /* Combinations of the above, for ease of use. */ + MO_UB = MO_8, + MO_UW = MO_16, + MO_UL = MO_32, + MO_SB = MO_SIGN | MO_8, + MO_SW = MO_SIGN | MO_16, + MO_SL = MO_SIGN | MO_32, + MO_Q = MO_64, + + MO_LEUW = MO_LE | MO_UW, + MO_LEUL = MO_LE | MO_UL, + MO_LESW = MO_LE | MO_SW, + MO_LESL = MO_LE | MO_SL, + MO_LEQ = MO_LE | MO_Q, + + MO_BEUW = MO_BE | MO_UW, + MO_BEUL = MO_BE | MO_UL, + MO_BESW = MO_BE | MO_SW, + MO_BESL = MO_BE | MO_SL, + MO_BEQ = MO_BE | MO_Q, + +#ifdef NEED_CPU_H + MO_TEUW = MO_TE | MO_UW, + MO_TEUL = MO_TE | MO_UL, + MO_TESW = MO_TE | MO_SW, + MO_TESL = MO_TE | MO_SL, + MO_TEQ = MO_TE | MO_Q, +#endif + + MO_SSIZE = MO_SIZE | MO_SIGN, +} MemOp; + +#endif |