This is needed to boot MacOS ROM.
Pull the condition code and the program counter from the stack.
Operation:
(SP) -> CCR
SP + 2 -> SP
(SP) -> PC
SP + 4 - > SP
This operation is not privileged.
Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
Notes:
v2: update comment
SP + 4 -> SP
target/m68k/translate.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index ac936ebe8f14..e6942955713c 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -2969,6 +2969,20 @@ DISAS_INSN(rtd)
gen_jmp(s, tmp);
}
+DISAS_INSN(rtr)
+{
+ TCGv tmp;
+ TCGv ccr;
+
+ ccr = gen_load(s, OS_WORD, QREG_SP, 0, IS_USER(s));
+ gen_set_sr(s, ccr, true);
+ tcg_temp_free(ccr);
+ tcg_gen_addi_i32(QREG_SP, QREG_SP, 2);
+ tmp = gen_load(s, OS_LONG, QREG_SP, 0, IS_USER(s));
+ tcg_gen_addi_i32(QREG_SP, QREG_SP, 4);
+ gen_jmp(s, tmp);
+}
+
DISAS_INSN(rts)
{
TCGv tmp;
@@ -6015,6 +6029,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(nop, 4e71, ffff);
INSN(rtd, 4e74, ffff, RTD);
BASE(rts, 4e75, ffff);
+ INSN(rtr, 4e77, ffff, M68000);
BASE(jump, 4e80, ffc0);
BASE(jump, 4ec0, ffc0);
INSN(addsubq, 5000, f080, M68000);