From 727d937b59f1f722f983e20f9cd23b0e7ef60165 Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Fri, 13 Jan 2017 19:36:33 +0100 Subject: 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 Reviewed-by: Thomas Huth Reviewed-by: Richard Henderson Message-Id: <1484332593-16782-6-git-send-email-laurent@vivier.eu> --- target/m68k/translate.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'target/m68k/translate.c') 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; -- cgit v1.2.3