sysdeps/unix/sysv/linux/sparc/sys/ucontext.h

   1 /* Copyright (C) 1998-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_UCONTEXT_H
  19 #define _SYS_UCONTEXT_H 1
  20
  21 #include <features.h>
  22 #include <signal.h>
  23 #include <bits/wordsize.h>
  24
  25 #if __WORDSIZE == 64
  26
  27 #define MC_TSTATE       0
  28 #define MC_PC           1
  29 #define MC_NPC          2
  30 #define MC_Y            3
  31 #define MC_G1           4
  32 #define MC_G2           5
  33 #define MC_G3           6
  34 #define MC_G4           7
  35 #define MC_G5           8
  36 #define MC_G6           9
  37 #define MC_G7           10
  38 #define MC_O0           11
  39 #define MC_O1           12
  40 #define MC_O2           13
  41 #define MC_O3           14
  42 #define MC_O4           15
  43 #define MC_O5           16
  44 #define MC_O6           17
  45 #define MC_O7           18
  46 #define MC_NGREG        19
  47
  48 typedef unsigned long mc_greg_t;
  49 typedef mc_greg_t mc_gregset_t[MC_NGREG];
  50
  51 #define MC_MAXFPQ       16
  52 struct mc_fq {
  53         unsigned long   *mcfq_addr;
  54         unsigned int    mcfq_insn;
  55 };
  56
  57 struct mc_fpu {
  58         union {
  59                 unsigned int    sregs[32];
  60                 unsigned long   dregs[32];
  61                 long double     qregs[16];
  62         } mcfpu_fregs;
  63         unsigned long   mcfpu_fsr;
  64         unsigned long   mcfpu_fprs;
  65         unsigned long   mcfpu_gsr;
  66         struct mc_fq    *mcfpu_fq;
  67         unsigned char   mcfpu_qcnt;
  68         unsigned char   mcfpu_qentsz;
  69         unsigned char   mcfpu_enab;
  70 };
  71 typedef struct mc_fpu mc_fpu_t;
  72
  73 typedef struct {
  74         mc_gregset_t    mc_gregs;
  75         mc_greg_t       mc_fp;
  76         mc_greg_t       mc_i7;
  77         mc_fpu_t        mc_fpregs;
  78 } mcontext_t;
  79
  80 typedef struct ucontext {
  81         struct ucontext         *uc_link;
  82         unsigned long           uc_flags;
  83         unsigned long           __uc_sigmask;
  84         mcontext_t              uc_mcontext;
  85         stack_t                 uc_stack;
  86         __sigset_t              uc_sigmask;
  87 } ucontext_t;
  88
  89 #endif /* __WORDISIZE == 64 */
  90
  91 /*
  92  * Location of the users' stored registers relative to R0.
  93  * Usage is as an index into a gregset_t array or as u.u_ar0[XX].
  94  */
  95 #define REG_PSR (0)
  96 #define REG_PC  (1)
  97 #define REG_nPC (2)
  98 #define REG_Y   (3)
  99 #define REG_G1  (4)
 100 #define REG_G2  (5)
 101 #define REG_G3  (6)
 102 #define REG_G4  (7)
 103 #define REG_G5  (8)
 104 #define REG_G6  (9)
 105 #define REG_G7  (10)
 106 #define REG_O0  (11)
 107 #define REG_O1  (12)
 108 #define REG_O2  (13)
 109 #define REG_O3  (14)
 110 #define REG_O4  (15)
 111 #define REG_O5  (16)
 112 #define REG_O6  (17)
 113 #define REG_O7  (18)
 114
 115 /*
 116  * A gregset_t is defined as an array type for compatibility with the reference
 117  * source. This is important due to differences in the way the C language
 118  * treats arrays and structures as parameters.
 119  *
 120  * Note that NGREG is really (sizeof (struct regs) / sizeof (greg_t)),
 121  * but that the ABI defines it absolutely to be 21 (resp. 19).
 122  */
 123
 124 #if __WORDSIZE == 64
 125
 126 #define REG_ASI (19)
 127 #define REG_FPRS (20)
 128
 129 #define NGREG   21
 130 typedef long greg_t;
 131
 132 #else /* __WORDSIZE == 32 */
 133
 134 #define NGREG   19
 135 typedef int greg_t;
 136
 137 #endif /* __WORDSIZE == 32 */
 138
 139 typedef greg_t  gregset_t[NGREG];
 140
 141 /*
 142  * The following structures define how a register window can appear on the
 143  * stack. This structure is available (when required) through the `gwins'
 144  * field of an mcontext (nested within ucontext). SPARC_MAXWINDOW is the
 145  * maximum number of outstanding regiters window defined in the SPARC
 146  * architecture (*not* implementation).
 147  */
 148 #define SPARC_MAXREGWINDOW      31      /* max windows in SPARC arch. */
 149 struct  rwindow
 150   {
 151     greg_t rw_local[8];                 /* locals */
 152     greg_t rw_in[8];                    /* ins */
 153   };
 154
 155 #define rw_fp   rw_in[6]                /* frame pointer */
 156 #define rw_rtn  rw_in[7]                /* return address */
 157
 158 typedef struct gwindows
 159   {
 160     int            wbcnt;
 161     int           *spbuf[SPARC_MAXREGWINDOW];
 162     struct rwindow wbuf[SPARC_MAXREGWINDOW];
 163   } gwindows_t;
 164
 165 /*
 166  * Floating point definitions.
 167  */
 168
 169 #define MAXFPQ  16      /* max # of fpu queue entries currently supported */
 170
 171 /*
 172  * struct fq defines the minimal format of a floating point instruction queue
 173  * entry. The size of entries in the floating point queue are implementation
 174  * dependent. The union FQu is guarenteed to be the first field in any ABI
 175  * conformant system implementation. Any additional fields provided by an
 176  * implementation should not be used applications designed to be ABI conformant. */
 177
 178 struct fpq
 179   {
 180     unsigned long *fpq_addr;            /* address */
 181     unsigned long fpq_instr;            /* instruction */
 182   };
 183
 184 struct fq
 185   {
 186     union                               /* FPU inst/addr queue */
 187       {
 188         double whole;
 189         struct fpq fpq;
 190       } FQu;
 191   };
 192
 193 #define FPU_REGS_TYPE           unsigned
 194 #define FPU_DREGS_TYPE          unsigned long long
 195 #define V7_FPU_FSR_TYPE         unsigned
 196 #define V9_FPU_FSR_TYPE         unsigned long long
 197 #define V9_FPU_FPRS_TYPE        unsigned
 198
 199 #if __WORDSIZE == 64
 200
 201 typedef struct fpu
 202   {
 203     union {                             /* FPU floating point regs */
 204       unsigned          fpu_regs[32];   /* 32 singles */
 205       double            fpu_dregs[16];  /* 32 doubles */
 206       long double       fpu_qregs[16];  /* 16 quads */
 207     } fpu_fr;
 208     struct fq       *fpu_q;             /* ptr to array of FQ entries */
 209     unsigned long   fpu_fsr;            /* FPU status register */
 210     unsigned char   fpu_qcnt;           /* # of entries in saved FQ */
 211     unsigned char   fpu_q_entrysize;    /* # of bytes per FQ entry */
 212     unsigned char   fpu_en;             /* flag signifying fpu in use */
 213   } fpregset_t;
 214
 215 #else /* __WORDSIZE == 32 */
 216
 217 typedef struct fpu
 218   {
 219     union {                             /* FPU floating point regs */
 220       __extension__ unsigned long long fpu_regs[32];    /* 32 singles */
 221       double             fpu_dregs[16]; /* 16 doubles */
 222     } fpu_fr;
 223     struct fq       *fpu_q;             /* ptr to array of FQ entries */
 224     unsigned        fpu_fsr;            /* FPU status register */
 225     unsigned char   fpu_qcnt;           /* # of entries in saved FQ */
 226     unsigned char   fpu_q_entrysize;    /* # of bytes per FQ entry */
 227     unsigned char   fpu_en;             /* flag signifying fpu in use */
 228   } fpregset_t;
 229
 230 /*
 231  * The following structure is for associating extra register state with
 232  * the ucontext structure and is kept within the uc_mcontext filler area.
 233  *
 234  * If (xrs_id == XRS_ID) then the xrs_ptr field is a valid pointer to
 235  * extra register state. The exact format of the extra register state
 236  * pointed to by xrs_ptr is platform-dependent.
 237  *
 238  * Note: a platform may or may not manage extra register state.
 239  */
 240 typedef struct
 241   {
 242     unsigned int xrs_id;                /* indicates xrs_ptr validity */
 243     void *       xrs_ptr;               /* ptr to extra reg state */
 244   } xrs_t;
 245
 246 #define XRS_ID  0x78727300              /* the string "xrs" */
 247
 248 typedef struct
 249   {
 250     gregset_t   gregs;          /* general register set */
 251     gwindows_t  *gwins;         /* POSSIBLE pointer to register windows */
 252     fpregset_t  fpregs;         /* floating point register set */
 253     xrs_t       xrs;            /* POSSIBLE extra register state association */
 254     long        filler[19];
 255   } mcontext_t;
 256
 257
 258 /* Userlevel context.  */
 259 typedef struct ucontext
 260   {
 261     unsigned long   uc_flags;
 262     struct ucontext *uc_link;
 263     __sigset_t      uc_sigmask;
 264     stack_t         uc_stack;
 265     mcontext_t      uc_mcontext;
 266   } ucontext_t;
 267
 268 #endif /* __WORDSIZE == 32 */
 269 #endif /* sys/ucontext.h */