arch/frv/include/asm/registers.h

   1 /* registers.h: register frame declarations
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 /*
  13  * notes:
  14  *
  15  * (1) that the members of all these structures are carefully aligned to permit
  16  *     usage of STD/STDF instructions
  17  *
  18  * (2) if you change these structures, you must change the code in
  19  *     arch/frvnommu/kernel/{break.S,entry.S,switch_to.S,gdb-stub.c}
  20  *
  21  *
  22  * the kernel stack space block looks like this:
  23  *
  24  *      +0x2000 +----------------------
  25  *              | union {
  26  *              |       struct frv_frame0 {
  27  *              |               struct user_context {
  28  *              |                       struct user_int_regs
  29  *              |                       struct user_fpmedia_regs
  30  *              |               }
  31  *              |               struct frv_debug_regs
  32  *              |       }
  33  *              |       struct pt_regs [user exception]
  34  *              | }
  35  *              +---------------------- <-- __kernel_frame0_ptr (maybe GR28)
  36  *              |
  37  *              | kernel stack
  38  *              |
  39  *              |......................
  40  *              | struct pt_regs [kernel exception]
  41  *              |...................... <-- __kernel_frame0_ptr (maybe GR28)
  42  *              |
  43  *              | kernel stack
  44  *              |
  45  *              |...................... <-- stack pointer (GR1)
  46  *              |
  47  *              | unused stack space
  48  *              |
  49  *              +----------------------
  50  *              | struct thread_info
  51  *      +0x0000 +---------------------- <-- __current_thread_info (GR15);
  52  *
  53  * note that GR28 points to the current exception frame
  54  */
  55
  56 #ifndef _ASM_REGISTERS_H
  57 #define _ASM_REGISTERS_H
  58
  59 #ifndef __ASSEMBLY__
  60 #define __OFFSET(X,N)   ((X)+(N)*4)
  61 #define __OFFSETC(X,N)  xxxxxxxxxxxxxxxxxxxxxxxx
  62 #else
  63 #define __OFFSET(X,N)   ((X)+(N)*4)
  64 #define __OFFSETC(X,N)  ((X)+(N))
  65 #endif
  66
  67 /*****************************************************************************/
  68 /*
  69  * Exception/Interrupt frame
  70  * - held on kernel stack
  71  * - 8-byte aligned on stack (old SP is saved in frame)
  72  * - GR0 is fixed 0, so we don't save it
  73  */
  74 #ifndef __ASSEMBLY__
  75
  76 struct pt_regs {
  77         unsigned long           psr;            /* Processor Status Register */
  78         unsigned long           isr;            /* Integer Status Register */
  79         unsigned long           ccr;            /* Condition Code Register */
  80         unsigned long           cccr;           /* Condition Code for Conditional Insns Register */
  81         unsigned long           lr;             /* Link Register */
  82         unsigned long           lcr;            /* Loop Count Register */
  83         unsigned long           pc;             /* Program Counter Register */
  84         unsigned long           __status;       /* exception status */
  85         unsigned long           syscallno;      /* syscall number or -1 */
  86         unsigned long           orig_gr8;       /* original syscall arg #1 */
  87         unsigned long           gner0;
  88         unsigned long           gner1;
  89         unsigned long long      iacc0;
  90         unsigned long           tbr;            /* GR0 is fixed zero, so we use this for TBR */
  91         unsigned long           sp;             /* GR1: USP/KSP */
  92         unsigned long           fp;             /* GR2: FP */
  93         unsigned long           gr3;
  94         unsigned long           gr4;
  95         unsigned long           gr5;
  96         unsigned long           gr6;
  97         unsigned long           gr7;            /* syscall number */
  98         unsigned long           gr8;            /* 1st syscall param; syscall return */
  99         unsigned long           gr9;            /* 2nd syscall param */
 100         unsigned long           gr10;           /* 3rd syscall param */
 101         unsigned long           gr11;           /* 4th syscall param */
 102         unsigned long           gr12;           /* 5th syscall param */
 103         unsigned long           gr13;           /* 6th syscall param */
 104         unsigned long           gr14;
 105         unsigned long           gr15;
 106         unsigned long           gr16;           /* GP pointer */
 107         unsigned long           gr17;           /* small data */
 108         unsigned long           gr18;           /* PIC/PID */
 109         unsigned long           gr19;
 110         unsigned long           gr20;
 111         unsigned long           gr21;
 112         unsigned long           gr22;
 113         unsigned long           gr23;
 114         unsigned long           gr24;
 115         unsigned long           gr25;
 116         unsigned long           gr26;
 117         unsigned long           gr27;
 118         struct pt_regs          *next_frame;    /* GR28 - next exception frame */
 119         unsigned long           gr29;           /* GR29 - OS reserved */
 120         unsigned long           gr30;           /* GR30 - OS reserved */
 121         unsigned long           gr31;           /* GR31 - OS reserved */
 122 } __attribute__((aligned(8)));
 123
 124 #endif
 125
 126 #define REG__STATUS_STEP        0x00000001      /* - reenable single stepping on return */
 127 #define REG__STATUS_STEPPED     0x00000002      /* - single step caused exception */
 128 #define REG__STATUS_BROKE       0x00000004      /* - BREAK insn caused exception */
 129 #define REG__STATUS_SYSC_ENTRY  0x40000000      /* - T on syscall entry (ptrace.c only) */
 130 #define REG__STATUS_SYSC_EXIT   0x80000000      /* - T on syscall exit (ptrace.c only) */
 131
 132 #define REG_GR(R)       __OFFSET(REG_GR0, (R))
 133
 134 #define REG_SP          REG_GR(1)
 135 #define REG_FP          REG_GR(2)
 136 #define REG_PREV_FRAME  REG_GR(28)      /* previous exception frame pointer (old gr28 value) */
 137 #define REG_CURR_TASK   REG_GR(29)      /* current task */
 138
 139 /*****************************************************************************/
 140 /*
 141  * debugging registers
 142  */
 143 #ifndef __ASSEMBLY__
 144
 145 struct frv_debug_regs
 146 {
 147         unsigned long           dcr;
 148         unsigned long           ibar[4] __attribute__((aligned(8)));
 149         unsigned long           dbar[4] __attribute__((aligned(8)));
 150         unsigned long           dbdr[4][4] __attribute__((aligned(8)));
 151         unsigned long           dbmr[4][4] __attribute__((aligned(8)));
 152 } __attribute__((aligned(8)));
 153
 154 #endif
 155
 156 /*****************************************************************************/
 157 /*
 158  * userspace registers
 159  */
 160 #ifndef __ASSEMBLY__
 161
 162 struct user_int_regs
 163 {
 164         /* integer registers
 165          * - up to gr[31] mirror pt_regs
 166          * - total size must be multiple of 8 bytes
 167          */
 168         unsigned long           psr;            /* Processor Status Register */
 169         unsigned long           isr;            /* Integer Status Register */
 170         unsigned long           ccr;            /* Condition Code Register */
 171         unsigned long           cccr;           /* Condition Code for Conditional Insns Register */
 172         unsigned long           lr;             /* Link Register */
 173         unsigned long           lcr;            /* Loop Count Register */
 174         unsigned long           pc;             /* Program Counter Register */
 175         unsigned long           __status;       /* exception status */
 176         unsigned long           syscallno;      /* syscall number or -1 */
 177         unsigned long           orig_gr8;       /* original syscall arg #1 */
 178         unsigned long           gner[2];
 179         unsigned long long      iacc[1];
 180
 181         union {
 182                 unsigned long   tbr;
 183                 unsigned long   gr[64];
 184         };
 185 };
 186
 187 struct user_fpmedia_regs
 188 {
 189         /* FP/Media registers */
 190         unsigned long   fr[64];
 191         unsigned long   fner[2];
 192         unsigned long   msr[2];
 193         unsigned long   acc[8];
 194         unsigned char   accg[8];
 195         unsigned long   fsr[1];
 196 };
 197
 198 struct user_context
 199 {
 200         struct user_int_regs            i;
 201         struct user_fpmedia_regs        f;
 202
 203         /* we provide a context extension so that we can save the regs for CPUs that
 204          * implement many more of Fujitsu's lavish register spec
 205          */
 206         void *extension;
 207 } __attribute__((aligned(8)));
 208
 209 struct frv_frame0 {
 210         union {
 211                 struct pt_regs          regs;
 212                 struct user_context     uc;
 213         };
 214
 215         struct frv_debug_regs           debug;
 216
 217 } __attribute__((aligned(32)));
 218
 219 #endif
 220
 221 #define __INT_GR(R)             __OFFSET(__INT_GR0,             (R))
 222
 223 #define __FPMEDIA_FR(R)         __OFFSET(__FPMEDIA_FR0,         (R))
 224 #define __FPMEDIA_FNER(R)       __OFFSET(__FPMEDIA_FNER0,       (R))
 225 #define __FPMEDIA_MSR(R)        __OFFSET(__FPMEDIA_MSR0,        (R))
 226 #define __FPMEDIA_ACC(R)        __OFFSET(__FPMEDIA_ACC0,        (R))
 227 #define __FPMEDIA_ACCG(R)       __OFFSETC(__FPMEDIA_ACCG0,      (R))
 228 #define __FPMEDIA_FSR(R)        __OFFSET(__FPMEDIA_FSR0,        (R))
 229
 230 #define __THREAD_GR(R)          __OFFSET(__THREAD_GR16,         (R) - 16)
 231
 232 #endif /* _ASM_REGISTERS_H */