arch/x86/include/uapi/asm/sigcontext.h

   1 #ifndef _UAPI_ASM_X86_SIGCONTEXT_H
   2 #define _UAPI_ASM_X86_SIGCONTEXT_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/types.h>
   6
   7 #define FP_XSTATE_MAGIC1        0x46505853U
   8 #define FP_XSTATE_MAGIC2        0x46505845U
   9 #define FP_XSTATE_MAGIC2_SIZE   sizeof(FP_XSTATE_MAGIC2)
  10
  11 /*
  12  * bytes 464..511 in the current 512byte layout of fxsave/fxrstor frame
  13  * are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
  14  * are used to extended the fpstate pointer in the sigcontext, which now
  15  * includes the extended state information along with fpstate information.
  16  *
  17  * Presence of FP_XSTATE_MAGIC1 at the beginning of this SW reserved
  18  * area and FP_XSTATE_MAGIC2 at the end of memory layout
  19  * (extended_size - FP_XSTATE_MAGIC2_SIZE) indicates the presence of the
  20  * extended state information in the memory layout pointed by the fpstate
  21  * pointer in sigcontext.
  22  */
  23 struct _fpx_sw_bytes {
  24         __u32 magic1;           /* FP_XSTATE_MAGIC1 */
  25         __u32 extended_size;    /* total size of the layout referred by
  26                                  * fpstate pointer in the sigcontext.
  27                                  */
  28         __u64 xfeatures;
  29                                 /* feature bit mask (including fp/sse/extended
  30                                  * state) that is present in the memory
  31                                  * layout.
  32                                  */
  33         __u32 xstate_size;      /* actual xsave state size, based on the
  34                                  * features saved in the layout.
  35                                  * 'extended_size' will be greater than
  36                                  * 'xstate_size'.
  37                                  */
  38         __u32 padding[7];       /*  for future use. */
  39 };
  40
  41 #ifdef __i386__
  42 /*
  43  * As documented in the iBCS2 standard..
  44  *
  45  * The first part of "struct _fpstate" is just the normal i387
  46  * hardware setup, the extra "status" word is used to save the
  47  * coprocessor status word before entering the handler.
  48  *
  49  * Pentium III FXSR, SSE support
  50  *      Gareth Hughes <gareth@valinux.com>, May 2000
  51  *
  52  * The FPU state data structure has had to grow to accommodate the
  53  * extended FPU state required by the Streaming SIMD Extensions.
  54  * There is no documented standard to accomplish this at the moment.
  55  */
  56 struct _fpreg {
  57         unsigned short significand[4];
  58         unsigned short exponent;
  59 };
  60
  61 struct _fpxreg {
  62         unsigned short significand[4];
  63         unsigned short exponent;
  64         unsigned short padding[3];
  65 };
  66
  67 struct _xmmreg {
  68         unsigned long element[4];
  69 };
  70
  71 struct _fpstate {
  72         /* Regular FPU environment */
  73         unsigned long   cw;
  74         unsigned long   sw;
  75         unsigned long   tag;
  76         unsigned long   ipoff;
  77         unsigned long   cssel;
  78         unsigned long   dataoff;
  79         unsigned long   datasel;
  80         struct _fpreg   _st[8];
  81         unsigned short  status;
  82         unsigned short  magic;          /* 0xffff = regular FPU data only */
  83
  84         /* FXSR FPU environment */
  85         unsigned long   _fxsr_env[6];   /* FXSR FPU env is ignored */
  86         unsigned long   mxcsr;
  87         unsigned long   reserved;
  88         struct _fpxreg  _fxsr_st[8];    /* FXSR FPU reg data is ignored */
  89         struct _xmmreg  _xmm[8];
  90         unsigned long   padding1[44];
  91
  92         union {
  93                 unsigned long   padding2[12];
  94                 struct _fpx_sw_bytes sw_reserved; /* represents the extended
  95                                                    * state info */
  96         };
  97 };
  98
  99 #define X86_FXSR_MAGIC          0x0000
 100
 101 #ifndef __KERNEL__
 102 /*
 103  * User-space might still rely on the old definition:
 104  */
 105 struct sigcontext {
 106         unsigned short gs, __gsh;
 107         unsigned short fs, __fsh;
 108         unsigned short es, __esh;
 109         unsigned short ds, __dsh;
 110         unsigned long edi;
 111         unsigned long esi;
 112         unsigned long ebp;
 113         unsigned long esp;
 114         unsigned long ebx;
 115         unsigned long edx;
 116         unsigned long ecx;
 117         unsigned long eax;
 118         unsigned long trapno;
 119         unsigned long err;
 120         unsigned long eip;
 121         unsigned short cs, __csh;
 122         unsigned long eflags;
 123         unsigned long esp_at_signal;
 124         unsigned short ss, __ssh;
 125         struct _fpstate __user *fpstate;
 126         unsigned long oldmask;
 127         unsigned long cr2;
 128 };
 129 #endif /* !__KERNEL__ */
 130
 131 #else /* __i386__ */
 132
 133 /* FXSAVE frame */
 134 /* Note: reserved1/2 may someday contain valuable data. Always save/restore
 135    them when you change signal frames. */
 136 struct _fpstate {
 137         __u16   cwd;
 138         __u16   swd;
 139         __u16   twd;            /* Note this is not the same as the
 140                                    32bit/x87/FSAVE twd */
 141         __u16   fop;
 142         __u64   rip;
 143         __u64   rdp;
 144         __u32   mxcsr;
 145         __u32   mxcsr_mask;
 146         __u32   st_space[32];   /* 8*16 bytes for each FP-reg */
 147         __u32   xmm_space[64];  /* 16*16 bytes for each XMM-reg  */
 148         __u32   reserved2[12];
 149         union {
 150                 __u32   reserved3[12];
 151                 struct _fpx_sw_bytes sw_reserved; /* represents the extended
 152                                                    * state information */
 153         };
 154 };
 155
 156 #ifndef __KERNEL__
 157 /*
 158  * User-space might still rely on the old definition:
 159  */
 160 struct sigcontext {
 161         __u64 r8;
 162         __u64 r9;
 163         __u64 r10;
 164         __u64 r11;
 165         __u64 r12;
 166         __u64 r13;
 167         __u64 r14;
 168         __u64 r15;
 169         __u64 rdi;
 170         __u64 rsi;
 171         __u64 rbp;
 172         __u64 rbx;
 173         __u64 rdx;
 174         __u64 rax;
 175         __u64 rcx;
 176         __u64 rsp;
 177         __u64 rip;
 178         __u64 eflags;           /* RFLAGS */
 179         __u16 cs;
 180
 181         /*
 182          * Prior to 2.5.64 ("[PATCH] x86-64 updates for 2.5.64-bk3"),
 183          * Linux saved and restored fs and gs in these slots.  This
 184          * was counterproductive, as fsbase and gsbase were never
 185          * saved, so arch_prctl was presumably unreliable.
 186          *
 187          * If these slots are ever needed for any other purpose, there
 188          * is some risk that very old 64-bit binaries could get
 189          * confused.  I doubt that many such binaries still work,
 190          * though, since the same patch in 2.5.64 also removed the
 191          * 64-bit set_thread_area syscall, so it appears that there is
 192          * no TLS API that works in both pre- and post-2.5.64 kernels.
 193          */
 194         __u16 __pad2;           /* Was gs. */
 195         __u16 __pad1;           /* Was fs. */
 196
 197         __u16 ss;
 198         __u64 err;
 199         __u64 trapno;
 200         __u64 oldmask;
 201         __u64 cr2;
 202         struct _fpstate __user *fpstate;        /* zero when no FPU context */
 203 #ifdef __ILP32__
 204         __u32 __fpstate_pad;
 205 #endif
 206         __u64 reserved1[8];
 207 };
 208 #endif /* !__KERNEL__ */
 209
 210 #endif /* !__i386__ */
 211
 212 struct _header {
 213         __u64 xfeatures;
 214         __u64 reserved1[2];
 215         __u64 reserved2[5];
 216 };
 217
 218 struct _ymmh_state {
 219         /* 16 * 16 bytes for each YMMH-reg */
 220         __u32 ymmh_space[64];
 221 };
 222
 223 /*
 224  * Extended state pointed by the fpstate pointer in the sigcontext.
 225  * In addition to the fpstate, information encoded in the xstate_hdr
 226  * indicates the presence of other extended state information
 227  * supported by the processor and OS.
 228  */
 229 struct _xstate {
 230         struct _fpstate fpstate;
 231         struct _header xstate_hdr;
 232         struct _ymmh_state ymmh;
 233         /* new processor state extensions go here */
 234 };
 235
 236 #endif /* _UAPI_ASM_X86_SIGCONTEXT_H */