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target/i386: Raise #GP on unaligned m128 accesses when required.

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Many instructions which load/store 128-bit values are supposed to
raise #GP when the memory operand isn't 16-byte aligned. This includes:
 - Instructions explicitly requiring memory alignment (Exceptions Type 1
   in the "AVX and SSE Instruction Exception Specification" section of
   the SDM)
 - Legacy SSE instructions that load/store 128-bit values (Exceptions
   Types 2 and 4).

This change sets MO_ALIGN_16 on 128-bit memory accesses that require
16-byte alignment. It adds cpu_record_sigbus and cpu_do_unaligned_access
hooks that simulate a #GP exception in qemu-user and qemu-system,
respectively.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/217
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ricky Zhou <ricky@rzhou.org>
Message-Id: <20220830034816.57091-2-ricky@rzhou.org>
[Do not bother checking PREFIX_VEX, since AVX is not supported. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-09-18 00:27:12 +02:00
parent 52281c6d11
commit 958e1dd130
6 changed files with 72 additions and 29 deletions
Download patch file Download diff file Expand all files Collapse all files

8
target/i386/tcg/sysemu/excp_helper.c
View file

@ -439,3 +439,11 @@ bool x86_cpu_tlb_fill(CPUState *cs, vaddr addr, int size,
}
return true;
}
G_NORETURN void x86_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
MMUAccessType access_type,
int mmu_idx, uintptr_t retaddr)
{
X86CPU *cpu = X86_CPU(cs);
handle_unaligned_access(&cpu->env, vaddr, access_type, retaddr);
}