motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-06 17:23:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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

13
target/i386/tcg/excp_helper.c
View file

@ -140,3 +140,16 @@ G_NORETURN void raise_exception_ra(CPUX86State *env, int exception_index,
{
raise_interrupt2(env, exception_index, 0, 0, 0, retaddr);
}
G_NORETURN void handle_unaligned_access(CPUX86State *env, vaddr vaddr,
MMUAccessType access_type,
uintptr_t retaddr)
{
/*
* Unaligned accesses are currently only triggered by SSE/AVX
* instructions that impose alignment requirements on memory
* operands. These instructions raise #GP(0) upon accessing an
* unaligned address.
*/
raise_exception_ra(env, EXCP0D_GPF, retaddr);
}