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m68k: implement movep instruction

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This patch implements movep instruction. It moves data between a data register
and alternate bytes within the address space starting at the location
specified and incrementing by two.

It was designed for the original 68000 and used in firmwares for
interfacing the 8-bit peripherals through the 16-bit data bus.
Without this patch opcode for this instruction is recognized as some bitop.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Signed-off-by: Mihail Abakumov <mikhail.abakumov@ispras.ru>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180206124431.31433.91946.stgit@pasha-VirtualBox>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Pavel Dovgalyuk 2018-02-06 15:44:31 +03:00 • committed by Laurent Vivier
parent bec9c64ef7
commit 1226e21229
3 changed files with 49 additions and 0 deletions
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1
target/m68k/cpu.h
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@ -492,6 +492,7 @@ enum m68k_features {
M68K_FEATURE_RTD,
M68K_FEATURE_CHK2,
M68K_FEATURE_M68040, /* instructions specific to MC68040 */
M68K_FEATURE_MOVEP,
};
static inline int m68k_feature(CPUM68KState *env, int feature)