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64 lines
2.2 KiB
64 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_USER_H |
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#define _ASM_X86_USER_H |
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#ifdef CONFIG_X86_32 |
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# include <asm/user_32.h> |
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#else |
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# include <asm/user_64.h> |
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#endif |
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#include <asm/types.h> |
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struct user_ymmh_regs { |
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/* 16 * 16 bytes for each YMMH-reg */ |
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__u32 ymmh_space[64]; |
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}; |
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struct user_xstate_header { |
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__u64 xfeatures; |
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__u64 reserved1[2]; |
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__u64 reserved2[5]; |
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}; |
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/* |
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* The structure layout of user_xstateregs, used for exporting the |
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* extended register state through ptrace and core-dump (NT_X86_XSTATE note) |
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* interfaces will be same as the memory layout of xsave used by the processor |
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* (except for the bytes 464..511, which can be used by the software) and hence |
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* the size of this structure varies depending on the features supported by the |
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* processor and OS. The size of the structure that users need to use can be |
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* obtained by doing: |
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* cpuid_count(0xd, 0, &eax, &ptrace_xstateregs_struct_size, &ecx, &edx); |
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* i.e., cpuid.(eax=0xd,ecx=0).ebx will be the size that user (debuggers, etc.) |
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* need to use. |
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* |
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* For now, only the first 8 bytes of the software usable bytes[464..471] will |
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* be used and will be set to OS enabled xstate mask (which is same as the |
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* 64bit mask returned by the xgetbv's xCR0). Users (analyzing core dump |
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* remotely, etc.) can use this mask as well as the mask saved in the |
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* xstate_hdr bytes and interpret what states the processor/OS supports |
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* and what states are in modified/initialized conditions for the |
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* particular process/thread. |
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* |
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* Also when the user modifies certain state FP/SSE/etc through the |
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* ptrace interface, they must ensure that the header.xfeatures |
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* bytes[512..519] of the memory layout are updated correspondingly. |
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* i.e., for example when FP state is modified to a non-init state, |
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* header.xfeatures's bit 0 must be set to '1', when SSE is modified to |
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* non-init state, header.xfeatures's bit 1 must to be set to '1', etc. |
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*/ |
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#define USER_XSTATE_FX_SW_WORDS 6 |
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#define USER_XSTATE_XCR0_WORD 0 |
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struct user_xstateregs { |
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struct { |
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__u64 fpx_space[58]; |
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__u64 xstate_fx_sw[USER_XSTATE_FX_SW_WORDS]; |
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} i387; |
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struct user_xstate_header header; |
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struct user_ymmh_regs ymmh; |
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/* further processor state extensions go here */ |
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}; |
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#endif /* _ASM_X86_USER_H */
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