LXR linux/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
  76struct 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
 145struct 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
 162struct 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
 187struct 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
 198struct 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
 209struct 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 */
 233