1 #ifndef _ASM_IA64_PTRACE_H
2 #define _ASM_IA64_PTRACE_H
3
4 /*
5 * Copyright (C) 1998-2004 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
7 * Stephane Eranian <eranian@hpl.hp.com>
8 * Copyright (C) 2003 Intel Co
9 * Suresh Siddha <suresh.b.siddha@intel.com>
10 * Fenghua Yu <fenghua.yu@intel.com>
11 * Arun Sharma <arun.sharma@intel.com>
12 *
13 * 12/07/98 S. Eranian added pt_regs & switch_stack
14 * 12/21/98 D. Mosberger updated to match latest code
15 * 6/17/99 D. Mosberger added second unat member to "struct switch_stack"
16 *
17 */
18 /*
19 * When a user process is blocked, its state looks as follows:
20 *
21 * +----------------------+ ------- IA64_STK_OFFSET
22 * | | ^
23 * | struct pt_regs | |
24 * | | |
25 * +----------------------+ |
26 * | | |
27 * | memory stack | |
28 * | (growing downwards) | |
29 * //.....................// |
30 * |
31 * //.....................// |
32 * | | |
33 * +----------------------+ |
34 * | struct switch_stack | |
35 * | | |
36 * +----------------------+ |
37 * | | |
38 * //.....................// |
39 * |
40 * //.....................// |
41 * | | |
42 * | register stack | |
43 * | (growing upwards) | |
44 * | | |
45 * +----------------------+ | --- IA64_RBS_OFFSET
46 * | struct thread_info | | ^
47 * +----------------------+ | |
48 * | | | |
49 * | struct task_struct | | |
50 * current -> | | | |
51 * +----------------------+ -------
52 *
53 * Note that ar.ec is not saved explicitly in pt_reg or switch_stack.
54 * This is because ar.ec is saved as part of ar.pfs.
55 */
56
57
58 #include <asm/fpu.h>
59
60 #ifdef __KERNEL__
61 #ifndef ASM_OFFSETS_C
62 #include <asm/asm-offsets.h>
63 #endif
64
65 /*
66 * Base-2 logarithm of number of pages to allocate per task structure
67 * (including register backing store and memory stack):
68 */
69 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
70 # define KERNEL_STACK_SIZE_ORDER 3
71 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
72 # define KERNEL_STACK_SIZE_ORDER 2
73 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
74 # define KERNEL_STACK_SIZE_ORDER 1
75 #else
76 # define KERNEL_STACK_SIZE_ORDER 0
77 #endif
78
79 #define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31)
80 #define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE)
81
82 #define KERNEL_STACK_SIZE IA64_STK_OFFSET
83
84 #endif /* __KERNEL__ */
85
86 #ifndef __ASSEMBLY__
87
88 /*
89 * This struct defines the way the registers are saved on system
90 * calls.
91 *
92 * We don't save all floating point register because the kernel
93 * is compiled to use only a very small subset, so the other are
94 * untouched.
95 *
96 * THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE
97 * (because the memory stack pointer MUST ALWAYS be aligned this way)
98 *
99 */
100 struct pt_regs {
101 /* The following registers are saved by SAVE_MIN: */
102 unsigned long b6; /* scratch */
103 unsigned long b7; /* scratch */
104
105 unsigned long ar_csd; /* used by cmp8xchg16 (scratch) */
106 unsigned long ar_ssd; /* reserved for future use (scratch) */
107
108 unsigned long r8; /* scratch (return value register 0) */
109 unsigned long r9; /* scratch (return value register 1) */
110 unsigned long r10; /* scratch (return value register 2) */
111 unsigned long r11; /* scratch (return value register 3) */
112
113 unsigned long cr_ipsr; /* interrupted task's psr */
114 unsigned long cr_iip; /* interrupted task's instruction pointer */
115 /*
116 * interrupted task's function state; if bit 63 is cleared, it
117 * contains syscall's ar.pfs.pfm:
118 */
119 unsigned long cr_ifs;
120
121 unsigned long ar_unat; /* interrupted task's NaT register (preserved) */
122 unsigned long ar_pfs; /* prev function state */
123 unsigned long ar_rsc; /* RSE configuration */
124 /* The following two are valid only if cr_ipsr.cpl > 0 || ti->flags & _TIF_MCA_INIT */
125 unsigned long ar_rnat; /* RSE NaT */
126 unsigned long ar_bspstore; /* RSE bspstore */
127
128 unsigned long pr; /* 64 predicate registers (1 bit each) */
129 unsigned long b0; /* return pointer (bp) */
130 unsigned long loadrs; /* size of dirty partition << 16 */
131
132 unsigned long r1; /* the gp pointer */
133 unsigned long r12; /* interrupted task's memory stack pointer */
134 unsigned long r13; /* thread pointer */
135
136 unsigned long ar_fpsr; /* floating point status (preserved) */
137 unsigned long r15; /* scratch */
138
139 /* The remaining registers are NOT saved for system calls. */
140
141 unsigned long r14; /* scratch */
142 unsigned long r2; /* scratch */
143 unsigned long r3; /* scratch */
144
145 /* The following registers are saved by SAVE_REST: */
146 unsigned long r16; /* scratch */
147 unsigned long r17; /* scratch */
148 unsigned long r18; /* scratch */
149 unsigned long r19; /* scratch */
150 unsigned long r20; /* scratch */
151 unsigned long r21; /* scratch */
152 unsigned long r22; /* scratch */
153 unsigned long r23; /* scratch */
154 unsigned long r24; /* scratch */
155 unsigned long r25; /* scratch */
156 unsigned long r26; /* scratch */
157 unsigned long r27; /* scratch */
158 unsigned long r28; /* scratch */
159 unsigned long r29; /* scratch */
160 unsigned long r30; /* scratch */
161 unsigned long r31; /* scratch */
162
163 unsigned long ar_ccv; /* compare/exchange value (scratch) */
164
165 /*
166 * Floating point registers that the kernel considers scratch:
167 */
168 struct ia64_fpreg f6; /* scratch */
169 struct ia64_fpreg f7; /* scratch */
170 struct ia64_fpreg f8; /* scratch */
171 struct ia64_fpreg f9; /* scratch */
172 struct ia64_fpreg f10; /* scratch */
173 struct ia64_fpreg f11; /* scratch */
174 };
175
176 /*
177 * This structure contains the addition registers that need to
178 * preserved across a context switch. This generally consists of
179 * "preserved" registers.
180 */
181 struct switch_stack {
182 unsigned long caller_unat; /* user NaT collection register (preserved) */
183 unsigned long ar_fpsr; /* floating-point status register */
184
185 struct ia64_fpreg f2; /* preserved */
186 struct ia64_fpreg f3; /* preserved */
187 struct ia64_fpreg f4; /* preserved */
188 struct ia64_fpreg f5; /* preserved */
189
190 struct ia64_fpreg f12; /* scratch, but untouched by kernel */
191 struct ia64_fpreg f13; /* scratch, but untouched by kernel */
192 struct ia64_fpreg f14; /* scratch, but untouched by kernel */
193 struct ia64_fpreg f15; /* scratch, but untouched by kernel */
194 struct ia64_fpreg f16; /* preserved */
195 struct ia64_fpreg f17; /* preserved */
196 struct ia64_fpreg f18; /* preserved */
197 struct ia64_fpreg f19; /* preserved */
198 struct ia64_fpreg f20; /* preserved */
199 struct ia64_fpreg f21; /* preserved */
200 struct ia64_fpreg f22; /* preserved */
201 struct ia64_fpreg f23; /* preserved */
202 struct ia64_fpreg f24; /* preserved */
203 struct ia64_fpreg f25; /* preserved */
204 struct ia64_fpreg f26; /* preserved */
205 struct ia64_fpreg f27; /* preserved */
206 struct ia64_fpreg f28; /* preserved */
207 struct ia64_fpreg f29; /* preserved */
208 struct ia64_fpreg f30; /* preserved */
209 struct ia64_fpreg f31; /* preserved */
210
211 unsigned long r4; /* preserved */
212 unsigned long r5; /* preserved */
213 unsigned long r6; /* preserved */
214 unsigned long r7; /* preserved */
215
216 unsigned long b0; /* so we can force a direct return in copy_thread */
217 unsigned long b1;
218 unsigned long b2;
219 unsigned long b3;
220 unsigned long b4;
221 unsigned long b5;
222
223 unsigned long ar_pfs; /* previous function state */
224 unsigned long ar_lc; /* loop counter (preserved) */
225 unsigned long ar_unat; /* NaT bits for r4-r7 */
226 unsigned long ar_rnat; /* RSE NaT collection register */
227 unsigned long ar_bspstore; /* RSE dirty base (preserved) */
228 unsigned long pr; /* 64 predicate registers (1 bit each) */
229 };
230
231 #ifdef __KERNEL__
232
233 #include <asm/current.h>
234 #include <asm/page.h>
235
236 /*
237 * We use the ia64_psr(regs)->ri to determine which of the three
238 * instructions in bundle (16 bytes) took the sample. Generate
239 * the canonical representation by adding to instruction pointer.
240 */
241 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
242
user_stack_pointer(struct pt_regs * regs)243 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
244 {
245 /* FIXME: should this be bspstore + nr_dirty regs? */
246 return regs->ar_bspstore;
247 }
248
is_syscall_success(struct pt_regs * regs)249 static inline int is_syscall_success(struct pt_regs *regs)
250 {
251 return regs->r10 != -1;
252 }
253
regs_return_value(struct pt_regs * regs)254 static inline long regs_return_value(struct pt_regs *regs)
255 {
256 if (is_syscall_success(regs))
257 return regs->r8;
258 else
259 return -regs->r8;
260 }
261
262 /* Conserve space in histogram by encoding slot bits in address
263 * bits 2 and 3 rather than bits 0 and 1.
264 */
265 #define profile_pc(regs) \
266 ({ \
267 unsigned long __ip = instruction_pointer(regs); \
268 (__ip & ~3UL) + ((__ip & 3UL) << 2); \
269 })
270
271 /* given a pointer to a task_struct, return the user's pt_regs */
272 # define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
273 # define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr)
274 # define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
275 # define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
276 # define fsys_mode(task,regs) \
277 ({ \
278 struct task_struct *_task = (task); \
279 struct pt_regs *_regs = (regs); \
280 !user_mode(_regs) && user_stack(_task, _regs); \
281 })
282
283 /*
284 * System call handlers that, upon successful completion, need to return a negative value
285 * should call force_successful_syscall_return() right before returning. On architectures
286 * where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
287 * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
288 * flag will not get set. On architectures which do not support a separate error flag,
289 * the macro is a no-op and the spurious error condition needs to be filtered out by some
290 * other means (e.g., in user-level, by passing an extra argument to the syscall handler,
291 * or something along those lines).
292 *
293 * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
294 */
295 # define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0)
296
297 struct task_struct; /* forward decl */
298 struct unw_frame_info; /* forward decl */
299
300 extern void ia64_do_show_stack (struct unw_frame_info *, void *);
301 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
302 unsigned long *);
303 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
304 unsigned long, long *);
305 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
306 unsigned long, long);
307 extern void ia64_flush_fph (struct task_struct *);
308 extern void ia64_sync_fph (struct task_struct *);
309 extern void ia64_sync_krbs(void);
310 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
311 unsigned long, unsigned long);
312
313 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
314 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
315 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
316 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
317
318 extern void ia64_increment_ip (struct pt_regs *pt);
319 extern void ia64_decrement_ip (struct pt_regs *pt);
320
321 extern void ia64_ptrace_stop(void);
322 #define arch_ptrace_stop(code, info) \
323 ia64_ptrace_stop()
324 #define arch_ptrace_stop_needed(code, info) \
325 (!test_thread_flag(TIF_RESTORE_RSE))
326
327 extern void ptrace_attach_sync_user_rbs (struct task_struct *);
328 #define arch_ptrace_attach(child) \
329 ptrace_attach_sync_user_rbs(child)
330
331 #define arch_has_single_step() (1)
332 #define arch_has_block_step() (1)
333
334 #endif /* !__KERNEL__ */
335
336 /* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
337 struct pt_all_user_regs {
338 unsigned long nat;
339 unsigned long cr_iip;
340 unsigned long cfm;
341 unsigned long cr_ipsr;
342 unsigned long pr;
343
344 unsigned long gr[32];
345 unsigned long br[8];
346 unsigned long ar[128];
347 struct ia64_fpreg fr[128];
348 };
349
350 #endif /* !__ASSEMBLY__ */
351
352 /* indices to application-registers array in pt_all_user_regs */
353 #define PT_AUR_RSC 16
354 #define PT_AUR_BSP 17
355 #define PT_AUR_BSPSTORE 18
356 #define PT_AUR_RNAT 19
357 #define PT_AUR_CCV 32
358 #define PT_AUR_UNAT 36
359 #define PT_AUR_FPSR 40
360 #define PT_AUR_PFS 64
361 #define PT_AUR_LC 65
362 #define PT_AUR_EC 66
363
364 /*
365 * The numbers chosen here are somewhat arbitrary but absolutely MUST
366 * not overlap with any of the number assigned in <linux/ptrace.h>.
367 */
368 #define PTRACE_SINGLEBLOCK 12 /* resume execution until next branch */
369 #define PTRACE_OLD_GETSIGINFO 13 /* (replaced by PTRACE_GETSIGINFO in <linux/ptrace.h>) */
370 #define PTRACE_OLD_SETSIGINFO 14 /* (replaced by PTRACE_SETSIGINFO in <linux/ptrace.h>) */
371 #define PTRACE_GETREGS 18 /* get all registers (pt_all_user_regs) in one shot */
372 #define PTRACE_SETREGS 19 /* set all registers (pt_all_user_regs) in one shot */
373
374 #define PTRACE_OLDSETOPTIONS 21
375
376 #endif /* _ASM_IA64_PTRACE_H */
377