On 680x0 family only.
Address Register indirect With postincrement:
When using the stack pointer (A7) with byte size data, the register
is incremented by two.
Address Register indirect With predecrement:
When using the stack pointer (A7) with byte size data, the register
is decremented by two.
Signed-off-by: Laurent Vivier <laur...@vivier.eu>
---
target/m68k/translate.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index cf5d8dd..727c189 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -725,7 +725,12 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext
*s,
}
reg = get_areg(s, reg0);
tmp = tcg_temp_new();
- tcg_gen_subi_i32(tmp, reg, opsize_bytes(opsize));
+ if (reg0 == 7 && opsize == OS_BYTE &&
+ m68k_feature(s->env, M68K_FEATURE_M68000)) {
+ tcg_gen_subi_i32(tmp, reg, 2);
+ } else {
+ tcg_gen_subi_i32(tmp, reg, opsize_bytes(opsize));
+ }
return tmp;
case 5: /* Indirect displacement. */
reg = get_areg(s, reg0);
@@ -801,7 +806,12 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext
*s, int mode, int reg0,
result = gen_ldst(s, opsize, reg, val, what);
if (what == EA_STORE || !addrp) {
TCGv tmp = tcg_temp_new();
- tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize));
+ if (reg0 == 7 && opsize == OS_BYTE &&
+ m68k_feature(s->env, M68K_FEATURE_M68000)) {
+ tcg_gen_subi_i32(tmp, reg, 2);
+ } else {
+ tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize));
+ }
delay_set_areg(s, reg0, tmp, true);
}
return result;
--
2.7.4
