mirror of https://github.com/proxmox/mirror_qemu
target/m68k: implement rtr instruction
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> Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210307212552.523552-1-laurent@vivier.eu>master
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f4abdf3271
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6abcec3674
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@ -2969,6 +2969,25 @@ DISAS_INSN(rtd)
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gen_jmp(s, tmp);
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gen_jmp(s, tmp);
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}
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}
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DISAS_INSN(rtr)
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{
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TCGv tmp;
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TCGv ccr;
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TCGv sp;
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sp = tcg_temp_new();
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ccr = gen_load(s, OS_WORD, QREG_SP, 0, IS_USER(s));
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tcg_gen_addi_i32(sp, QREG_SP, 2);
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tmp = gen_load(s, OS_LONG, sp, 0, IS_USER(s));
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tcg_gen_addi_i32(QREG_SP, sp, 4);
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tcg_temp_free(sp);
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gen_set_sr(s, ccr, true);
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tcg_temp_free(ccr);
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gen_jmp(s, tmp);
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}
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DISAS_INSN(rts)
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DISAS_INSN(rts)
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{
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{
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TCGv tmp;
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TCGv tmp;
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@ -6015,6 +6034,7 @@ void register_m68k_insns (CPUM68KState *env)
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BASE(nop, 4e71, ffff);
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BASE(nop, 4e71, ffff);
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INSN(rtd, 4e74, ffff, RTD);
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INSN(rtd, 4e74, ffff, RTD);
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BASE(rts, 4e75, ffff);
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BASE(rts, 4e75, ffff);
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INSN(rtr, 4e77, ffff, M68000);
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BASE(jump, 4e80, ffc0);
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BASE(jump, 4e80, ffc0);
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BASE(jump, 4ec0, ffc0);
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BASE(jump, 4ec0, ffc0);
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INSN(addsubq, 5000, f080, M68000);
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INSN(addsubq, 5000, f080, M68000);
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