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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.

Backports commit 1226e212292e271b8795265c9639d5c0553df199 from qemu
This commit is contained in:
Pavel Dovgalyuk 2018-03-07 11:51:26 -05:00 committed by Lioncash
parent 8e7ecd89a4
commit 01150e151e
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 50 additions and 0 deletions
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2
qemu/target/m68k/cpu.c
View file

@ -107,6 +107,7 @@ static void m68000_cpu_initfn(struct uc_struct *uc, Object *obj, void *opaque)
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(struct uc_struct *uc, Object *obj, void *opaque)
@ -129,6 +130,7 @@ static void m68020_cpu_initfn(struct uc_struct *uc, Object *obj, void *opaque)
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
qemu/target/m68k/cpu.h
View file

@ -489,6 +489,7 @@ 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)

47
qemu/target/m68k/translate.c
View file

@ -2139,6 +2139,52 @@ DISAS_INSN(movem)
tcg_temp_free(tcg_ctx, addr);
}
DISAS_INSN(movep)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
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_ctx);
tcg_gen_addi_i32(tcg_ctx, abuf, addr, displ);
dbuf = tcg_temp_new(tcg_ctx);
if (insn & 0x40) {
i = 4;
} else {
i = 2;
}
if (insn & 0x80) {
for ( ; i > 0 ; i--) {
tcg_gen_shri_i32(tcg_ctx, dbuf, reg, (i - 1) * 8);
tcg_gen_qemu_st8(s->uc, dbuf, abuf, IS_USER(s));
if (i > 1) {
tcg_gen_addi_i32(tcg_ctx, abuf, abuf, 2);
}
}
} else {
for ( ; i > 0 ; i--) {
tcg_gen_qemu_ld8u(s->uc, dbuf, abuf, IS_USER(s));
tcg_gen_deposit_i32(tcg_ctx, reg, reg, dbuf, (i - 1) * 8, 8);
if (i > 1) {
tcg_gen_addi_i32(tcg_ctx, abuf, abuf, 2);
}
}
}
tcg_temp_free(tcg_ctx, abuf);
tcg_temp_free(tcg_ctx, dbuf);
}
DISAS_INSN(bitop_im)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
@ -5899,6 +5945,7 @@ 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);