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target/m68k: add 680x0 "move to SR" instruction

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Some cleanup, and allows SR to be moved from any addressing mode.
Previous code was wrong for coldfire: coldfire also allows to
use addressing mode to set SR/CCR. It only supports Data register
to get SR/CCR (move from)

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180104012913.30763-15-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-01-04 02:29:10 +01:00
parent 01490ea8f5
commit b6a21d8d8f
1 changed files with 22 additions and 16 deletions
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38
target/m68k/translate.c
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@ -2162,27 +2162,34 @@ static void gen_set_sr_im(DisasContext *s, uint16_t val, int ccr_only)
tcg_gen_movi_i32(QREG_CC_N, val & CCF_N ? -1 : 0);
tcg_gen_movi_i32(QREG_CC_X, val & CCF_X ? 1 : 0);
} else {
gen_helper_set_sr(cpu_env, tcg_const_i32(val));
TCGv sr = tcg_const_i32(val);
gen_helper_set_sr(cpu_env, sr);
tcg_temp_free(sr);
}
set_cc_op(s, CC_OP_FLAGS);
}
static void gen_set_sr(CPUM68KState *env, DisasContext *s, uint16_t insn,
int ccr_only)
static void gen_set_sr(DisasContext *s, TCGv val, int ccr_only)
{
if ((insn & 0x38) == 0) {
if (ccr_only) {
gen_helper_set_ccr(cpu_env, DREG(insn, 0));
} else {
gen_helper_set_sr(cpu_env, DREG(insn, 0));
}
set_cc_op(s, CC_OP_FLAGS);
} else if ((insn & 0x3f) == 0x3c) {
if (ccr_only) {
gen_helper_set_ccr(cpu_env, val);
} else {
gen_helper_set_sr(cpu_env, val);
}
set_cc_op(s, CC_OP_FLAGS);
}
static void gen_move_to_sr(CPUM68KState *env, DisasContext *s, uint16_t insn,
bool ccr_only)
{
if ((insn & 0x3f) == 0x3c) {
uint16_t val;
val = read_im16(env, s);
gen_set_sr_im(s, val, ccr_only);
} else {
disas_undef(env, s, insn);
TCGv src;
SRC_EA(env, src, OS_WORD, 0, NULL);
gen_set_sr(s, src, ccr_only);
}
}
@ -2557,7 +2564,7 @@ DISAS_INSN(neg)
DISAS_INSN(move_to_ccr)
{
gen_set_sr(env, s, insn, 1);
gen_move_to_sr(env, s, insn, true);
}
DISAS_INSN(not)
@ -4409,7 +4416,7 @@ DISAS_INSN(move_to_sr)
gen_exception(s, s->insn_pc, EXCP_PRIVILEGE);
return;
}
gen_set_sr(env, s, insn, 0);
gen_move_to_sr(env, s, insn, false);
gen_lookup_tb(s);
}
@ -5556,9 +5563,8 @@ void register_m68k_insns (CPUM68KState *env)
BASE(move_to_ccr, 44c0, ffc0);
INSN(not, 4680, fff8, CF_ISA_A);
INSN(not, 4600, ff00, M68000);
INSN(undef, 46c0, ffc0, M68000);
#if defined(CONFIG_SOFTMMU)
INSN(move_to_sr, 46c0, ffc0, CF_ISA_A);
BASE(move_to_sr, 46c0, ffc0);
#endif
INSN(nbcd, 4800, ffc0, M68000);
INSN(linkl, 4808, fff8, M68000);