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m68k: implement movep instruction 

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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2
target/m68k/cpu.c
View File

@ -113,6 +113,7 @@ static void m68000_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_M68000);
m68k_set_feature(env, M68K_FEATURE_USP);
m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
static void m68020_cpu_initfn(Object *obj)
@ -135,6 +136,7 @@ static void m68020_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_CHK2);
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
#define m68030_cpu_initfn m68020_cpu_initfn

1
target/m68k/cpu.h
View File

@ -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)

46
target/m68k/translate.c
View File

@ -2078,6 +2078,51 @@ DISAS_INSN(movem)
tcg_temp_free(addr);
}
DISAS_INSN(movep)
{
uint8_t i;
int16_t displ;
TCGv reg;
TCGv addr;
TCGv abuf;
TCGv dbuf;
displ = read_im16(env, s);
addr = AREG(insn, 0);
reg = DREG(insn, 9);
abuf = tcg_temp_new();
tcg_gen_addi_i32(abuf, addr, displ);
dbuf = tcg_temp_new();
if (insn & 0x40) {
i = 4;
} else {
i = 2;
}
if (insn & 0x80) {
for ( ; i > 0 ; i--) {
tcg_gen_shri_i32(dbuf, reg, (i - 1) * 8);
tcg_gen_qemu_st8(dbuf, abuf, IS_USER(s));
if (i > 1) {
tcg_gen_addi_i32(abuf, abuf, 2);
}
}
} else {
for ( ; i > 0 ; i--) {
tcg_gen_qemu_ld8u(dbuf, abuf, IS_USER(s));
tcg_gen_deposit_i32(reg, reg, dbuf, (i - 1) * 8, 8);
if (i > 1) {
tcg_gen_addi_i32(abuf, abuf, 2);
}
}
}
tcg_temp_free(abuf);
tcg_temp_free(dbuf);
}
DISAS_INSN(bitop_im)
{
int opsize;
@ -5678,6 +5723,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(bitop_reg, 0140, f1c0);
BASE(bitop_reg, 0180, f1c0);
BASE(bitop_reg, 01c0, f1c0);
INSN(movep, 0108, f138, MOVEP);
INSN(arith_im, 0280, fff8, CF_ISA_A);
INSN(arith_im, 0200, ff00, M68000);
INSN(undef, 02c0, ffc0, M68000);