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registers.h
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1 /* registers.h: register frame declarations
2  *
3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells ([email protected])
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 */
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