include/asm-frv/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 user_context
  27  *              |       struct pt_regs [user exception]
  28  *              | }
  29  *              +---------------------- <-- __kernel_frame0_ptr (maybe GR28)
  30  *              |
  31  *              | kernel stack
  32  *              |
  33  *              |......................
  34  *              | struct pt_regs [kernel exception]
  35  *              |...................... <-- __kernel_frame0_ptr (maybe GR28)
  36  *              |
  37  *              | kernel stack
  38  *              |
  39  *              |...................... <-- stack pointer (GR1)
  40  *              |
  41  *              | unused stack space
  42  *              |
  43  *              +----------------------
  44  *              | struct thread_info
  45  *      +0x0000 +---------------------- <-- __current_thread_info (GR15);
  46  *
  47  * note that GR28 points to the current exception frame
  48  */
  49
  50 #ifndef _ASM_REGISTERS_H
  51 #define _ASM_REGISTERS_H
  52
  53 #ifndef __ASSEMBLY__
  54 #define __OFFSET(X)     (X)
  55 #define __OFFSETC(X,N)  xxxxxxxxxxxxxxxxxxxxxxxx
  56 #else
  57 #define __OFFSET(X)     ((X)*4)
  58 #define __OFFSETC(X,N)  ((X)*4+(N))
  59 #endif
  60
  61 /*****************************************************************************/
  62 /*
  63  * Exception/Interrupt frame
  64  * - held on kernel stack
  65  * - 8-byte aligned on stack (old SP is saved in frame)
  66  * - GR0 is fixed 0, so we don't save it
  67  */
  68 #ifndef __ASSEMBLY__
  69
  70 struct pt_regs {
  71         unsigned long           psr;            /* Processor Status Register */
  72         unsigned long           isr;            /* Integer Status Register */
  73         unsigned long           ccr;            /* Condition Code Register */
  74         unsigned long           cccr;           /* Condition Code for Conditional Insns Register */
  75         unsigned long           lr;             /* Link Register */
  76         unsigned long           lcr;            /* Loop Count Register */
  77         unsigned long           pc;             /* Program Counter Register */
  78         unsigned long           __status;       /* exception status */
  79         unsigned long           syscallno;      /* syscall number or -1 */
  80         unsigned long           orig_gr8;       /* original syscall arg #1 */
  81         unsigned long           gner0;
  82         unsigned long           gner1;
  83         unsigned long long      iacc0;
  84         unsigned long           tbr;            /* GR0 is fixed zero, so we use this for TBR */
  85         unsigned long           sp;             /* GR1: USP/KSP */
  86         unsigned long           fp;             /* GR2: FP */
  87         unsigned long           gr3;
  88         unsigned long           gr4;
  89         unsigned long           gr5;
  90         unsigned long           gr6;
  91         unsigned long           gr7;            /* syscall number */
  92         unsigned long           gr8;            /* 1st syscall param; syscall return */
  93         unsigned long           gr9;            /* 2nd syscall param */
  94         unsigned long           gr10;           /* 3rd syscall param */
  95         unsigned long           gr11;           /* 4th syscall param */
  96         unsigned long           gr12;           /* 5th syscall param */
  97         unsigned long           gr13;           /* 6th syscall param */
  98         unsigned long           gr14;
  99         unsigned long           gr15;
 100         unsigned long           gr16;           /* GP pointer */
 101         unsigned long           gr17;           /* small data */
 102         unsigned long           gr18;           /* PIC/PID */
 103         unsigned long           gr19;
 104         unsigned long           gr20;
 105         unsigned long           gr21;
 106         unsigned long           gr22;
 107         unsigned long           gr23;
 108         unsigned long           gr24;
 109         unsigned long           gr25;
 110         unsigned long           gr26;
 111         unsigned long           gr27;
 112         struct pt_regs          *next_frame;    /* GR28 - next exception frame */
 113         unsigned long           gr29;           /* GR29 - OS reserved */
 114         unsigned long           gr30;           /* GR30 - OS reserved */
 115         unsigned long           gr31;           /* GR31 - OS reserved */
 116 } __attribute__((aligned(8)));
 117
 118 #endif
 119
 120 #define REG_PSR         __OFFSET( 0)    /* Processor Status Register */
 121 #define REG_ISR         __OFFSET( 1)    /* Integer Status Register */
 122 #define REG_CCR         __OFFSET( 2)    /* Condition Code Register */
 123 #define REG_CCCR        __OFFSET( 3)    /* Condition Code for Conditional Insns Register */
 124 #define REG_LR          __OFFSET( 4)    /* Link Register */
 125 #define REG_LCR         __OFFSET( 5)    /* Loop Count Register */
 126 #define REG_PC          __OFFSET( 6)    /* Program Counter */
 127
 128 #define REG__STATUS     __OFFSET( 7)    /* exception status */
 129 #define REG__STATUS_STEP        0x00000001      /* - reenable single stepping on return */
 130 #define REG__STATUS_STEPPED     0x00000002      /* - single step caused exception */
 131 #define REG__STATUS_BROKE       0x00000004      /* - BREAK insn caused exception */
 132 #define REG__STATUS_SYSC_ENTRY  0x40000000      /* - T on syscall entry (ptrace.c only) */
 133 #define REG__STATUS_SYSC_EXIT   0x80000000      /* - T on syscall exit (ptrace.c only) */
 134
 135 #define REG_SYSCALLNO   __OFFSET( 8)    /* syscall number or -1 */
 136 #define REG_ORIG_GR8    __OFFSET( 9)    /* saved GR8 for signal handling */
 137 #define REG_GNER0       __OFFSET(10)
 138 #define REG_GNER1       __OFFSET(11)
 139 #define REG_IACC0       __OFFSET(12)
 140
 141 #define REG_TBR         __OFFSET(14)    /* Trap Vector Register */
 142 #define REG_GR(R)       __OFFSET((14+(R)))
 143 #define REG__END        REG_GR(32)
 144
 145 #define REG_SP          REG_GR(1)
 146 #define REG_FP          REG_GR(2)
 147 #define REG_PREV_FRAME  REG_GR(28)      /* previous exception frame pointer (old gr28 value) */
 148 #define REG_CURR_TASK   REG_GR(29)      /* current task */
 149
 150 /*****************************************************************************/
 151 /*
 152  * extension tacked in front of the exception frame in debug mode
 153  */
 154 #ifndef __ASSEMBLY__
 155
 156 struct pt_debug_regs
 157 {
 158         unsigned long           bpsr;
 159         unsigned long           dcr;
 160         unsigned long           brr;
 161         unsigned long           nmar;
 162         struct pt_regs          normal_regs;
 163 } __attribute__((aligned(8)));
 164
 165 #endif
 166
 167 #define REG_NMAR                __OFFSET(-1)
 168 #define REG_BRR                 __OFFSET(-2)
 169 #define REG_DCR                 __OFFSET(-3)
 170 #define REG_BPSR                __OFFSET(-4)
 171 #define REG__DEBUG_XTRA         __OFFSET(4)
 172
 173 /*****************************************************************************/
 174 /*
 175  * userspace registers
 176  */
 177 #ifndef __ASSEMBLY__
 178
 179 struct user_int_regs
 180 {
 181         /* integer registers
 182          * - up to gr[31] mirror pt_regs
 183          * - total size must be multiple of 8 bytes
 184          */
 185         unsigned long           psr;            /* Processor Status Register */
 186         unsigned long           isr;            /* Integer Status Register */
 187         unsigned long           ccr;            /* Condition Code Register */
 188         unsigned long           cccr;           /* Condition Code for Conditional Insns Register */
 189         unsigned long           lr;             /* Link Register */
 190         unsigned long           lcr;            /* Loop Count Register */
 191         unsigned long           pc;             /* Program Counter Register */
 192         unsigned long           __status;       /* exception status */
 193         unsigned long           syscallno;      /* syscall number or -1 */
 194         unsigned long           orig_gr8;       /* original syscall arg #1 */
 195         unsigned long           gner[2];
 196         unsigned long long      iacc[1];
 197
 198         union {
 199                 unsigned long   tbr;
 200                 unsigned long   gr[64];
 201         };
 202 };
 203
 204 struct user_fpmedia_regs
 205 {
 206         /* FP/Media registers */
 207         unsigned long   fr[64];
 208         unsigned long   fner[2];
 209         unsigned long   msr[2];
 210         unsigned long   acc[8];
 211         unsigned char   accg[8];
 212         unsigned long   fsr[1];
 213 };
 214
 215 struct user_context
 216 {
 217         struct user_int_regs            i;
 218         struct user_fpmedia_regs        f;
 219
 220         /* we provide a context extension so that we can save the regs for CPUs that
 221          * implement many more of Fujitsu's lavish register spec
 222          */
 223         void *extension;
 224 } __attribute__((aligned(8)));
 225
 226 #endif
 227
 228 #define NR_USER_INT_REGS        (14 + 64)
 229 #define NR_USER_FPMEDIA_REGS    (64 + 2 + 2 + 8 + 8/4 + 1)
 230 #define NR_USER_CONTEXT         (NR_USER_INT_REGS + NR_USER_FPMEDIA_REGS + 1)
 231
 232 #define USER_CONTEXT_SIZE       (((NR_USER_CONTEXT + 1) & ~1) * 4)
 233
 234 #define __THREAD_FRAME          __OFFSET(0)
 235 #define __THREAD_CURR           __OFFSET(1)
 236 #define __THREAD_SP             __OFFSET(2)
 237 #define __THREAD_FP             __OFFSET(3)
 238 #define __THREAD_LR             __OFFSET(4)
 239 #define __THREAD_PC             __OFFSET(5)
 240 #define __THREAD_GR(R)          __OFFSET(6 + (R) - 16)
 241 #define __THREAD_FRAME0         __OFFSET(19)
 242 #define __THREAD_USER           __OFFSET(19)
 243
 244 #define __USER_INT              __OFFSET(0)
 245 #define __INT_GR(R)             __OFFSET(14 + (R))
 246
 247 #define __USER_FPMEDIA          __OFFSET(NR_USER_INT_REGS)
 248 #define __FPMEDIA_FR(R)         __OFFSET(NR_USER_INT_REGS + (R))
 249 #define __FPMEDIA_FNER(R)       __OFFSET(NR_USER_INT_REGS + 64 + (R))
 250 #define __FPMEDIA_MSR(R)        __OFFSET(NR_USER_INT_REGS + 66 + (R))
 251 #define __FPMEDIA_ACC(R)        __OFFSET(NR_USER_INT_REGS + 68 + (R))
 252 #define __FPMEDIA_ACCG(R)       __OFFSETC(NR_USER_INT_REGS + 76, (R))
 253 #define __FPMEDIA_FSR(R)        __OFFSET(NR_USER_INT_REGS + 78 + (R))
 254
 255 #endif /* _ASM_REGISTERS_H */