arch/x86/include/asm/user.h

   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_xstate_header {
  18         __u64 xfeatures;
  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 header.xfeatures
  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  * header.xfeatures's bit 0 must be set to '1', when SSE is modified to
  48  * non-init state, header.xfeatures'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_xstate_header header;
  59         struct user_ymmh_regs ymmh;
  60         /* further processor state extensions go here */
  61 };
  62
  63 #endif /* _ASM_X86_USER_H */