haraldwolff/qemu-patch-raspberry4
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target-m68k: add 64bit mull

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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <rth@twidle.net>
This commit is contained in:
Laurent Vivier 2016-01-16 23:17:26 +01:00
parent 817af1c72d
commit 8be95defd6
1 changed files with 50 additions and 12 deletions
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62
target/m68k/translate.c
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@ -1863,24 +1863,62 @@ DISAS_INSN(tas)
DISAS_INSN(mull)
{
uint16_t ext;
TCGv reg;
TCGv src1;
TCGv dest;
int sign;
/* The upper 32 bits of the product are discarded, so
muls.l and mulu.l are functionally equivalent. */
ext = read_im16(env, s);
if (ext & 0x87ff) {
gen_exception(s, s->pc - 4, EXCP_UNSUPPORTED);
sign = ext & 0x800;
if (ext & 0x400) {
if (!m68k_feature(s->env, M68K_FEATURE_QUAD_MULDIV)) {
gen_exception(s, s->pc - 4, EXCP_UNSUPPORTED);
return;
}
SRC_EA(env, src1, OS_LONG, 0, NULL);
if (sign) {
tcg_gen_muls2_i32(QREG_CC_Z, QREG_CC_N, src1, DREG(ext, 12));
} else {
tcg_gen_mulu2_i32(QREG_CC_Z, QREG_CC_N, src1, DREG(ext, 12));
}
/* if Dl == Dh, 68040 returns low word */
tcg_gen_mov_i32(DREG(ext, 0), QREG_CC_N);
tcg_gen_mov_i32(DREG(ext, 12), QREG_CC_Z);
tcg_gen_or_i32(QREG_CC_Z, QREG_CC_Z, QREG_CC_N);
tcg_gen_movi_i32(QREG_CC_V, 0);
tcg_gen_movi_i32(QREG_CC_C, 0);
set_cc_op(s, CC_OP_FLAGS);
return;
}
reg = DREG(ext, 12);
SRC_EA(env, src1, OS_LONG, 0, NULL);
dest = tcg_temp_new();
tcg_gen_mul_i32(dest, src1, reg);
tcg_gen_mov_i32(reg, dest);
/* Unlike m68k, coldfire always clears the overflow bit. */
gen_logic_cc(s, dest, OS_LONG);
if (m68k_feature(s->env, M68K_FEATURE_M68000)) {
tcg_gen_movi_i32(QREG_CC_C, 0);
if (sign) {
tcg_gen_muls2_i32(QREG_CC_N, QREG_CC_V, src1, DREG(ext, 12));
/* QREG_CC_V is -(QREG_CC_V != (QREG_CC_N >> 31)) */
tcg_gen_sari_i32(QREG_CC_Z, QREG_CC_N, 31);
tcg_gen_setcond_i32(TCG_COND_NE, QREG_CC_V, QREG_CC_V, QREG_CC_Z);
} else {
tcg_gen_mulu2_i32(QREG_CC_N, QREG_CC_V, src1, DREG(ext, 12));
/* QREG_CC_V is -(QREG_CC_V != 0), use QREG_CC_C as 0 */
tcg_gen_setcond_i32(TCG_COND_NE, QREG_CC_V, QREG_CC_V, QREG_CC_C);
}
tcg_gen_neg_i32(QREG_CC_V, QREG_CC_V);
tcg_gen_mov_i32(DREG(ext, 12), QREG_CC_N);
tcg_gen_mov_i32(QREG_CC_Z, QREG_CC_N);
set_cc_op(s, CC_OP_FLAGS);
} else {
/* The upper 32 bits of the product are discarded, so
muls.l and mulu.l are functionally equivalent. */
tcg_gen_mul_i32(DREG(ext, 12), src1, DREG(ext, 12));
gen_logic_cc(s, DREG(ext, 12), OS_LONG);
}
}
static void gen_link(DisasContext *s, uint16_t insn, int32_t offset)