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 */ 233