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target/m68k: add reset

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The instruction traps if the CPU is not in
Supervisor state but the helper is empty because
there is no easy way to reset all the peripherals
without resetting the CPU itself.

Backports commit 0bdb2b3bf5660f892ddbfa09baea56cdca57ad1d from qemu
This commit is contained in:
Laurent Vivier 2018-03-06 08:25:59 -05:00 committed by Lioncash
parent c5643956e3
commit b82fe8b95c
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 26 additions and 0 deletions
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7
qemu/target/m68k/helper.c
View file

@ -586,3 +586,10 @@ void HELPER(set_mac_extu)(CPUM68KState *env, uint32_t val, uint32_t acc)
res |= (uint64_t)(val & 0xffff0000) << 16;
env->macc[acc + 1] = res;
}
#if defined(CONFIG_SOFTMMU)
void HELPER(reset)(CPUM68KState *env)
{
/* FIXME: reset all except CPU */
}
#endif

4
qemu/target/m68k/helper.h
View file

@ -98,3 +98,7 @@ DEF_HELPER_FLAGS_4(bfffo_mem, TCG_CALL_NO_WG, i64, env, i32, s32, i32)
DEF_HELPER_3(chk, void, env, s32, s32)
DEF_HELPER_4(chk2, void, env, s32, s32, s32)
#if defined(CONFIG_SOFTMMU)
DEF_HELPER_FLAGS_1(reset, TCG_CALL_NO_RWG, void, env)
#endif

15
qemu/target/m68k/translate.c
View file

@ -2848,6 +2848,20 @@ DISAS_INSN(unlk)
tcg_temp_free(tcg_ctx, src);
}
#if defined(CONFIG_SOFTMMU)
DISAS_INSN(reset)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
if (IS_USER(s)) {
gen_exception(s, s->insn_pc, EXCP_PRIVILEGE);
return;
}
gen_helper_reset(tcg_ctx, tcg_ctx->cpu_env);
}
#endif
DISAS_INSN(nop)
{
}
@ -5779,6 +5793,7 @@ void register_m68k_insns (CPUM68KState *env)
#if defined(CONFIG_SOFTMMU)
INSN(move_to_usp, 4e60, fff8, USP);
INSN(move_from_usp, 4e68, fff8, USP);
INSN(reset, 4e70, ffff, M68000);
BASE(stop, 4e72, ffff);
BASE(rte, 4e73, ffff);
INSN(movec, 4e7b, ffff, CF_ISA_A);