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ppc/translate: Use POWERPC_MMU_64 to detect 64-bit MMU models 

The ppc_tr_init_disas_context() function currently checks whether the
MMU is 64-bit by ANDing its model type with POWERPC_MMU_64B. This is
wrong : POWERPC_MMU_64B isn't a mask, it is the generic MMU model for
pre-PowerISA-2.03 64-bit CPUs (ie. PowerPC 970 in QEMU).

Use POWERPC_MMU_64 instead of POWERPC_MMU_64B. This should fix a
potential bug with some 32-bit CPUs for which 'need_access_type'
was mis-computed because (POWERPC_MMU_32B & POWERPC_MMU_64B)
happens to be equal to 1. The end result being a crash in
ppc_hash32_direct_store() because the access type isn't set:

        cpu_abort(cs, "ERROR: instruction should not need "
                 "address translation\n");

This doesn't change anything for 'lazy_tlb_flush' since POWERPC_MMU_32B
is checked first.

Fixes: 5f2a625452 ("ppc: Don't set access_type on all load/stores on hash64")
Signed-off-by: Stephane Duverger <stephane.duverger@free.fr>
[groug: - extended patch to address another misuse of POWERPC_MMU_64B
        - updated title and changelog accordingly]
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20201209173536.1437351-2-groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stephane Duverger 2020-12-09 18:35:35 +01:00 committed by David Gibson
parent ef0efa1a04
commit d55dfd446c
1 changed files with 2 additions and 2 deletions
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4
target/ppc/translate.c
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@ -7892,7 +7892,7 @@ static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->insns_flags = env->insns_flags;
ctx->insns_flags2 = env->insns_flags2;
ctx->access_type = -1;
ctx->need_access_type = !(env->mmu_model & POWERPC_MMU_64B);
ctx->need_access_type = !(env->mmu_model & POWERPC_MMU_64);
ctx->le_mode = !!(env->hflags & (1 << MSR_LE));
ctx->default_tcg_memop_mask = ctx->le_mode ? MO_LE : MO_BE;
ctx->flags = env->flags;
@ -7902,7 +7902,7 @@ static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
#endif
ctx->lazy_tlb_flush = env->mmu_model == POWERPC_MMU_32B
|| env->mmu_model == POWERPC_MMU_601
|| (env->mmu_model & POWERPC_MMU_64B);
|| env->mmu_model & POWERPC_MMU_64;
ctx->fpu_enabled = !!msr_fp;
if ((env->flags & POWERPC_FLAG_SPE) && msr_spe) {