diff options
| author | Laurent Vivier <laurent@vivier.eu> | 2017-01-13 19:36:33 +0100 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2017-01-14 10:06:21 +0100 |
| commit | 727d937b59f1f722f983e20f9cd23b0e7ef60165 (patch) | |
| tree | 55e45a46b3a565b37798f8374c6cb763d3c2fb33 /target/m68k/translate.c | |
| parent | b19578f42872aefef891e5804359af8d935a5487 (diff) | |
target-m68k: increment/decrement with SP
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 <laurent@vivier.eu>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1484332593-16782-6-git-send-email-laurent@vivier.eu>
Diffstat (limited to 'target/m68k/translate.c')
| -rw-r--r-- | target/m68k/translate.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/target/m68k/translate.c b/target/m68k/translate.c index cf5d8ddc3b..9f60fbc0db 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_addi_i32(tmp, reg, 2); + } else { + tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize)); + } delay_set_areg(s, reg0, tmp, true); } return result; |