1 #ifndef _ASM_X86_USER_H 2 #define _ASM_X86_USER_H 3 4 #ifdef CONFIG_X86_32 5 # include <asm/user_32.h> 6 #else 7 # include <asm/user_64.h> 8 #endif 9 10 #include <asm/types.h> 11 12 struct user_ymmh_regs { 13 /* 16 * 16 bytes for each YMMH-reg */ 14 __u32 ymmh_space[64]; 15 }; 16 17 struct user_xsave_hdr { 18 __u64 xstate_bv; 19 __u64 reserved1[2]; 20 __u64 reserved2[5]; 21 }; 22 23 /* 24 * The structure layout of user_xstateregs, used for exporting the 25 * extended register state through ptrace and core-dump (NT_X86_XSTATE note) 26 * interfaces will be same as the memory layout of xsave used by the processor 27 * (except for the bytes 464..511, which can be used by the software) and hence 28 * the size of this structure varies depending on the features supported by the 29 * processor and OS. The size of the structure that users need to use can be 30 * obtained by doing: 31 * cpuid_count(0xd, 0, &eax, &ptrace_xstateregs_struct_size, &ecx, &edx); 32 * i.e., cpuid.(eax=0xd,ecx=0).ebx will be the size that user (debuggers, etc.) 33 * need to use. 34 * 35 * For now, only the first 8 bytes of the software usable bytes[464..471] will 36 * be used and will be set to OS enabled xstate mask (which is same as the 37 * 64bit mask returned by the xgetbv's xCR0). Users (analyzing core dump 38 * remotely, etc.) can use this mask as well as the mask saved in the 39 * xstate_hdr bytes and interpret what states the processor/OS supports 40 * and what states are in modified/initialized conditions for the 41 * particular process/thread. 42 * 43 * Also when the user modifies certain state FP/SSE/etc through the 44 * ptrace interface, they must ensure that the xsave_hdr.xstate_bv 45 * bytes[512..519] of the memory layout are updated correspondingly. 46 * i.e., for example when FP state is modified to a non-init state, 47 * xsave_hdr.xstate_bv's bit 0 must be set to '1', when SSE is modified to 48 * non-init state, xsave_hdr.xstate_bv's bit 1 must to be set to '1', etc. 49 */ 50 #define USER_XSTATE_FX_SW_WORDS 6 51 #define USER_XSTATE_XCR0_WORD 0 52 53 struct user_xstateregs { 54 struct { 55 __u64 fpx_space[58]; 56 __u64 xstate_fx_sw[USER_XSTATE_FX_SW_WORDS]; 57 } i387; 58 struct user_xsave_hdr xsave_hdr; 59 struct user_ymmh_regs ymmh; 60 /* further processor state extensions go here */ 61 }; 62 63 #endif /* _ASM_X86_USER_H */ 64