1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
#ifndef _ASM_IA64_PTRACE_H
#define _ASM_IA64_PTRACE_H
/*
* Copyright (C) 1998-2001 Hewlett-Packard Co
* Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 1998, 1999 Stephane Eranian <eranian@hpl.hp.com>
*
* 12/07/98 S. Eranian added pt_regs & switch_stack
* 12/21/98 D. Mosberger updated to match latest code
* 6/17/99 D. Mosberger added second unat member to "struct switch_stack"
*
*/
/*
* When a user process is blocked, its state looks as follows:
*
* +----------------------+ ------- IA64_STK_OFFSET
* | | ^
* | struct pt_regs | |
* | | |
* +----------------------+ |
* | | |
* | memory stack | |
* | (growing downwards) | |
* //.....................// |
* |
* //.....................// |
* | | |
* +----------------------+ |
* | struct switch_stack | |
* | | |
* +----------------------+ |
* | | |
* //.....................// |
* |
* //.....................// |
* | | |
* | register stack | |
* | (growing upwards) | |
* | | |
* +----------------------+ | --- IA64_RBS_OFFSET
* | | | ^
* | struct task_struct | | |
* current -> | | | |
* +----------------------+ -------
*
* Note that ar.ec is not saved explicitly in pt_reg or switch_stack.
* This is because ar.ec is saved as part of ar.pfs.
*/
#include <linux/config.h>
#include <asm/fpu.h>
#include <asm/offsets.h>
/*
* Base-2 logarithm of number of pages to allocate per task structure
* (including register backing store and memory stack):
*/
#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
# define IA64_TASK_STRUCT_LOG_NUM_PAGES 3
#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
# define IA64_TASK_STRUCT_LOG_NUM_PAGES 2
#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
# define IA64_TASK_STRUCT_LOG_NUM_PAGES 1
#else
# define IA64_TASK_STRUCT_LOG_NUM_PAGES 0
#endif
#define IA64_RBS_OFFSET ((IA64_TASK_SIZE + 15) & ~15)
#define IA64_STK_OFFSET ((1 << IA64_TASK_STRUCT_LOG_NUM_PAGES)*PAGE_SIZE)
#define INIT_TASK_SIZE IA64_STK_OFFSET
#ifndef __ASSEMBLY__
#include <asm/current.h>
#include <asm/page.h>
/*
* This struct defines the way the registers are saved on system
* calls.
*
* We don't save all floating point register because the kernel
* is compiled to use only a very small subset, so the other are
* untouched.
*
* THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE
* (because the memory stack pointer MUST ALWAYS be aligned this way)
*
*/
struct pt_regs {
/* The following registers are saved by SAVE_MIN: */
unsigned long cr_ipsr; /* interrupted task's psr */
unsigned long cr_iip; /* interrupted task's instruction pointer */
unsigned long cr_ifs; /* interrupted task's function state */
unsigned long ar_unat; /* interrupted task's NaT register (preserved) */
unsigned long ar_pfs; /* prev function state */
unsigned long ar_rsc; /* RSE configuration */
/* The following two are valid only if cr_ipsr.cpl > 0: */
unsigned long ar_rnat; /* RSE NaT */
unsigned long ar_bspstore; /* RSE bspstore */
unsigned long pr; /* 64 predicate registers (1 bit each) */
unsigned long b6; /* scratch */
unsigned long loadrs; /* size of dirty partition << 16 */
unsigned long r1; /* the gp pointer */
unsigned long r2; /* scratch */
unsigned long r3; /* scratch */
unsigned long r12; /* interrupted task's memory stack pointer */
unsigned long r13; /* thread pointer */
unsigned long r14; /* scratch */
unsigned long r15; /* scratch */
unsigned long r8; /* scratch (return value register 0) */
unsigned long r9; /* scratch (return value register 1) */
unsigned long r10; /* scratch (return value register 2) */
unsigned long r11; /* scratch (return value register 3) */
/* The following registers are saved by SAVE_REST: */
unsigned long r16; /* scratch */
unsigned long r17; /* scratch */
unsigned long r18; /* scratch */
unsigned long r19; /* scratch */
unsigned long r20; /* scratch */
unsigned long r21; /* scratch */
unsigned long r22; /* scratch */
unsigned long r23; /* scratch */
unsigned long r24; /* scratch */
unsigned long r25; /* scratch */
unsigned long r26; /* scratch */
unsigned long r27; /* scratch */
unsigned long r28; /* scratch */
unsigned long r29; /* scratch */
unsigned long r30; /* scratch */
unsigned long r31; /* scratch */
unsigned long ar_ccv; /* compare/exchange value (scratch) */
unsigned long ar_fpsr; /* floating point status (preserved) */
unsigned long b0; /* return pointer (bp) */
unsigned long b7; /* scratch */
/*
* Floating point registers that the kernel considers
* scratch:
*/
struct ia64_fpreg f6; /* scratch */
struct ia64_fpreg f7; /* scratch */
struct ia64_fpreg f8; /* scratch */
struct ia64_fpreg f9; /* scratch */
};
/*
* This structure contains the addition registers that need to
* preserved across a context switch. This generally consists of
* "preserved" registers.
*/
struct switch_stack {
unsigned long caller_unat; /* user NaT collection register (preserved) */
unsigned long ar_fpsr; /* floating-point status register */
struct ia64_fpreg f2; /* preserved */
struct ia64_fpreg f3; /* preserved */
struct ia64_fpreg f4; /* preserved */
struct ia64_fpreg f5; /* preserved */
struct ia64_fpreg f10; /* scratch, but untouched by kernel */
struct ia64_fpreg f11; /* scratch, but untouched by kernel */
struct ia64_fpreg f12; /* scratch, but untouched by kernel */
struct ia64_fpreg f13; /* scratch, but untouched by kernel */
struct ia64_fpreg f14; /* scratch, but untouched by kernel */
struct ia64_fpreg f15; /* scratch, but untouched by kernel */
struct ia64_fpreg f16; /* preserved */
struct ia64_fpreg f17; /* preserved */
struct ia64_fpreg f18; /* preserved */
struct ia64_fpreg f19; /* preserved */
struct ia64_fpreg f20; /* preserved */
struct ia64_fpreg f21; /* preserved */
struct ia64_fpreg f22; /* preserved */
struct ia64_fpreg f23; /* preserved */
struct ia64_fpreg f24; /* preserved */
struct ia64_fpreg f25; /* preserved */
struct ia64_fpreg f26; /* preserved */
struct ia64_fpreg f27; /* preserved */
struct ia64_fpreg f28; /* preserved */
struct ia64_fpreg f29; /* preserved */
struct ia64_fpreg f30; /* preserved */
struct ia64_fpreg f31; /* preserved */
unsigned long r4; /* preserved */
unsigned long r5; /* preserved */
unsigned long r6; /* preserved */
unsigned long r7; /* preserved */
unsigned long b0; /* so we can force a direct return in copy_thread */
unsigned long b1;
unsigned long b2;
unsigned long b3;
unsigned long b4;
unsigned long b5;
unsigned long ar_pfs; /* previous function state */
unsigned long ar_lc; /* loop counter (preserved) */
unsigned long ar_unat; /* NaT bits for r4-r7 */
unsigned long ar_rnat; /* RSE NaT collection register */
unsigned long ar_bspstore; /* RSE dirty base (preserved) */
unsigned long pr; /* 64 predicate registers (1 bit each) */
};
#ifdef __KERNEL__
/* given a pointer to a task_struct, return the user's pt_regs */
# define ia64_task_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
# define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr)
# define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
struct task_struct; /* forward decl */
extern void show_regs (struct pt_regs *);
extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
unsigned long *);
extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
unsigned long, long *);
extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
unsigned long, long);
extern void ia64_flush_fph (struct task_struct *);
extern void ia64_sync_fph (struct task_struct *);
extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
unsigned long, unsigned long);
/* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
/* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
extern void ia64_increment_ip (struct pt_regs *pt);
extern void ia64_decrement_ip (struct pt_regs *pt);
static inline void
force_successful_syscall_return (void)
{
ia64_task_regs(current)->r8 = 0;
}
#endif /* !__KERNEL__ */
#endif /* !__ASSEMBLY__ */
/*
* The numbers chosen here are somewhat arbitrary but absolutely MUST
* not overlap with any of the number assigned in <linux/ptrace.h>.
*/
#define PTRACE_SINGLEBLOCK 12 /* resume execution until next branch */
#define PTRACE_GETSIGINFO 13 /* get child's siginfo structure */
#define PTRACE_SETSIGINFO 14 /* set child's siginfo structure */
#endif /* _ASM_IA64_PTRACE_H */
|
