Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / x86 / include / asm / user.h
blob24532c7da3d6d069f01d5be24affcf53dfafa5d4
1 #ifndef _ASM_X86_USER_H
2 #define _ASM_X86_USER_H
4 #ifdef CONFIG_X86_32
5 # include "user_32.h"
6 #else
7 # include "user_64.h"
8 #endif
10 #include <asm/types.h>
12 struct user_ymmh_regs {
13 /* 16 * 16 bytes for each YMMH-reg */
14 __u32 ymmh_space[64];
17 struct user_xsave_hdr {
18 __u64 xstate_bv;
19 __u64 reserved1[2];
20 __u64 reserved2[5];
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.
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.
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.
50 #define USER_XSTATE_FX_SW_WORDS 6
51 #define USER_XSTATE_XCR0_WORD 0
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 */
63 #endif /* _ASM_X86_USER_H */