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1 /* libunwind - a platform-independent unwind library
2    Copyright (C) 2001-2005 Hewlett-Packard Co
3 	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4 
5 This file is part of libunwind.
6 
7 Permission is hereby granted, free of charge, to any person obtaining
8 a copy of this software and associated documentation files (the
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sublicense, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14 
15 The above copyright notice and this permission notice shall be
16 included in all copies or substantial portions of the Software.
17 
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
25 
26 #ifndef IA64_LIBUNWIND_I_H
27 #define IA64_LIBUNWIND_I_H
28 
29 /* Target-dependent definitions that are internal to libunwind but need
30    to be shared with target-independent code.  */
31 
32 #include "elf64.h"
33 /* ANDROID support update. */
34 #include "map_info.h"
35 /* End of ANDROID update. */
36 #include "mempool.h"
37 
38 typedef struct
39   {
40     /* no ia64-specific fast trace */
41   }
42 unw_tdep_frame_t;
43 
44 enum ia64_pregnum
45   {
46     /* primary unat: */
47     IA64_REG_PRI_UNAT_GR,
48     IA64_REG_PRI_UNAT_MEM,
49 
50     /* memory stack (order matters: see build_script() */
51     IA64_REG_PSP,			/* previous memory stack pointer */
52     /* register stack */
53     IA64_REG_BSP,			/* register stack pointer */
54     IA64_REG_BSPSTORE,
55     IA64_REG_PFS,			/* previous function state */
56     IA64_REG_RNAT,
57     /* instruction pointer: */
58     IA64_REG_IP,
59 
60     /* preserved registers: */
61     IA64_REG_R4, IA64_REG_R5, IA64_REG_R6, IA64_REG_R7,
62     IA64_REG_NAT4, IA64_REG_NAT5, IA64_REG_NAT6, IA64_REG_NAT7,
63     IA64_REG_UNAT, IA64_REG_PR, IA64_REG_LC, IA64_REG_FPSR,
64     IA64_REG_B1, IA64_REG_B2, IA64_REG_B3, IA64_REG_B4, IA64_REG_B5,
65     IA64_REG_F2, IA64_REG_F3, IA64_REG_F4, IA64_REG_F5,
66     IA64_REG_F16, IA64_REG_F17, IA64_REG_F18, IA64_REG_F19,
67     IA64_REG_F20, IA64_REG_F21, IA64_REG_F22, IA64_REG_F23,
68     IA64_REG_F24, IA64_REG_F25, IA64_REG_F26, IA64_REG_F27,
69     IA64_REG_F28, IA64_REG_F29, IA64_REG_F30, IA64_REG_F31,
70     IA64_NUM_PREGS
71   };
72 
73 #ifdef UNW_LOCAL_ONLY
74 
75 typedef unw_word_t ia64_loc_t;
76 
77 #else /* !UNW_LOCAL_ONLY */
78 
79 typedef struct ia64_loc
80   {
81     unw_word_t w0, w1;
82   }
83 ia64_loc_t;
84 
85 #endif /* !UNW_LOCAL_ONLY */
86 
87 #include "script.h"
88 
89 #define ABI_UNKNOWN			0
90 #define ABI_LINUX			1
91 #define ABI_HPUX			2
92 #define ABI_FREEBSD			3
93 #define ABI_OPENVMS			4
94 #define ABI_NSK				5	/* Tandem/HP Non-Stop Kernel */
95 #define ABI_WINDOWS			6
96 
97 struct unw_addr_space
98   {
99     struct unw_accessors acc;
100     int big_endian;
101     int abi;	/* abi < 0 => unknown, 0 => SysV, 1 => HP-UX, 2 => Windows */
102     unw_caching_policy_t caching_policy;
103 #ifdef HAVE_ATOMIC_OPS_H
104     AO_t cache_generation;
105 #else
106     uint32_t cache_generation;
107 #endif
108     unw_word_t dyn_generation;
109     unw_word_t dyn_info_list_addr;	/* (cached) dyn_info_list_addr */
110 #ifndef UNW_REMOTE_ONLY
111     unsigned long long shared_object_removals;
112 #endif
113 
114     struct ia64_script_cache global_cache;
115 
116     /* ANDROID support update. */
117     struct map_info *map_list;
118     /* End of ANDROID update. */
119    };
120 
121 /* Note: The ABI numbers in the ABI-markers (.unwabi directive) are
122    not the same as the above ABI numbers.  */
123 #define ABI_MARKER_OLD_LINUX_SIGTRAMP	((0 << 8) | 's')
124 #define ABI_MARKER_OLD_LINUX_INTERRUPT	((0 << 8) | 'i')
125 #define ABI_MARKER_HP_UX_SIGTRAMP	((1 << 8) | 1)
126 #define ABI_MARKER_LINUX_SIGTRAMP	((3 << 8) | 's')
127 #define ABI_MARKER_LINUX_INTERRUPT	((3 << 8) | 'i')
128 
129 struct cursor
130   {
131     void *as_arg;		/* argument to address-space callbacks */
132     unw_addr_space_t as;	/* reference to per-address-space info */
133 
134     /* IP, CFM, and predicate cache (these are always equal to the
135        values stored in ip_loc, cfm_loc, and pr_loc,
136        respectively).  */
137     unw_word_t ip;		/* instruction pointer value */
138     unw_word_t cfm;		/* current frame mask */
139     unw_word_t pr;		/* current predicate values */
140 
141     /* current frame info: */
142     unw_word_t bsp;		/* backing store pointer value */
143     unw_word_t sp;		/* stack pointer value */
144     unw_word_t psp;		/* previous sp value */
145     ia64_loc_t cfm_loc;		/* cfm save location (or NULL) */
146     ia64_loc_t ec_loc;		/* ar.ec save location (usually cfm_loc) */
147     ia64_loc_t loc[IA64_NUM_PREGS];
148 
149     unw_word_t eh_args[4];	/* exception handler arguments */
150     unw_word_t sigcontext_addr;	/* address of sigcontext or 0 */
151     unw_word_t sigcontext_off;	/* sigcontext-offset relative to signal sp */
152 
153     short hint;
154     short prev_script;
155 
156     uint8_t nat_bitnr[4];	/* NaT bit numbers for r4-r7 */
157     uint16_t abi_marker;	/* abi_marker for current frame (if any) */
158     uint16_t last_abi_marker;	/* last abi_marker encountered so far */
159     uint8_t eh_valid_mask;
160 
161     unsigned int pi_valid :1;		/* is proc_info valid? */
162     unsigned int pi_is_dynamic :1; /* proc_info found via dynamic proc info? */
163     unw_proc_info_t pi;		/* info about current procedure */
164 
165     /* In case of stack-discontiguities, such as those introduced by
166        signal-delivery on an alternate signal-stack (see
167        sigaltstack(2)), we use the following data-structure to keep
168        track of the register-backing-store areas across on which the
169        current frame may be backed up.  Since there are at most 96
170        stacked registers and since we only have to track the current
171        frame and only areas that are not empty, this puts an upper
172        limit on the # of backing-store areas we have to track.
173 
174        Note that the rbs-area indexed by rbs_curr identifies the
175        rbs-area that was in effect at the time AR.BSP had the value
176        c->bsp.  However, this rbs area may not actually contain the
177        value in the register that c->bsp corresponds to because that
178        register may not have gotten spilled until much later, when a
179        possibly different rbs-area might have been in effect
180        already.  */
181     uint8_t rbs_curr;		/* index of curr. rbs-area (contains c->bsp) */
182     uint8_t rbs_left_edge;	/* index of inner-most valid rbs-area */
183     struct rbs_area
184       {
185 	unw_word_t end;
186 	unw_word_t size;
187 	ia64_loc_t rnat_loc;
188       }
189     rbs_area[96 + 2];	/* 96 stacked regs + 1 extra stack on each side... */
190 };
191 
192 struct ia64_global_unwind_state
193   {
194     pthread_mutex_t lock;		/* global data lock */
195 
196     volatile char init_done;
197 
198     /* Table of registers that prologues can save (and order in which
199        they're saved).  */
200     const unsigned char save_order[8];
201 
202     /*
203      * uc_addr() may return pointers to these variables.  We need to
204      * make sure they don't get written via ia64_put() or
205      * ia64_putfp().  To make it possible to test for these variables
206      * quickly, we collect them in a single sub-structure.
207      */
208     struct
209       {
210 	unw_word_t  r0;			/* r0 is byte-order neutral */
211 	unw_fpreg_t f0;			/* f0 is byte-order neutral */
212 	unw_fpreg_t f1_le, f1_be;	/* f1 is byte-order dependent */
213       }
214     read_only;
215     unw_fpreg_t nat_val_le, nat_val_be;
216     unw_fpreg_t int_val_le, int_val_be;
217 
218     struct mempool reg_state_pool;
219     struct mempool labeled_state_pool;
220 
221 # if UNW_DEBUG
222     const char *preg_name[IA64_NUM_PREGS];
223 # endif
224   };
225 
226 #define tdep_getcontext_trace           unw_getcontext
227 #define tdep_init_done			unw.init_done
228 #define tdep_init			UNW_OBJ(init)
229 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
230    tdep_search_unwind_table.  */
231 #define tdep_search_unwind_table	unw_search_ia64_unwind_table
232 #define tdep_find_unwind_table	ia64_find_unwind_table
233 #define tdep_find_proc_info		UNW_OBJ(find_proc_info)
234 #define tdep_uc_addr			UNW_OBJ(uc_addr)
235 #define tdep_get_elf_image		UNW_ARCH_OBJ(get_elf_image)
236 #define tdep_access_reg			UNW_OBJ(access_reg)
237 #define tdep_access_fpreg		UNW_OBJ(access_fpreg)
238 #define tdep_fetch_frame(c,ip,n)	do {} while(0)
239 #define tdep_cache_frame(c,rs)		do {} while(0)
240 #define tdep_reuse_frame(c,rs)		do {} while(0)
241 #define tdep_stash_frame(c,rs)		do {} while(0)
242 #define tdep_trace(cur,addr,n)		(-UNW_ENOINFO)
243 #define tdep_get_as(c)			((c)->as)
244 #define tdep_get_as_arg(c)		((c)->as_arg)
245 #define tdep_get_ip(c)			((c)->ip)
246 #define tdep_big_endian(as)		((c)->as->big_endian != 0)
247 
248 #ifndef UNW_LOCAL_ONLY
249 # define tdep_put_unwind_info		UNW_OBJ(put_unwind_info)
250 #endif
251 
252 /* This can't be an UNW_ARCH_OBJ() because we need separate
253    unw.initialized flags for the local-only and generic versions of
254    the library.  Also, if we wanted to have a single, shared global
255    data structure, we couldn't declare "unw" as HIDDEN/PROTECTED.  */
256 #define unw				UNW_OBJ(data)
257 
258 extern void tdep_init (void);
259 extern int tdep_find_unwind_table (struct elf_dyn_info *edi,
260 				   unw_addr_space_t as, char *path,
261 				   unw_word_t segbase, unw_word_t mapoff,
262 				   unw_word_t ip);
263 extern int tdep_find_proc_info (unw_addr_space_t as, unw_word_t ip,
264 				unw_proc_info_t *pi, int need_unwind_info,
265 				void *arg);
266 extern void tdep_put_unwind_info (unw_addr_space_t as,
267 				  unw_proc_info_t *pi, void *arg);
268 extern void *tdep_uc_addr (ucontext_t *uc, unw_regnum_t regnum,
269 			   uint8_t *nat_bitnr);
270 /* ANDROID support update. */
271 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
272 			       pid_t pid, unw_word_t ip,
273 			       unsigned long *segbase, unsigned long *mapoff,
274 			       char **path, void *as_arg);
275 /* End of ANDROID update. */
276 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
277 			    unw_word_t *valp, int write);
278 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
279 			      unw_fpreg_t *valp, int write);
280 
281 extern struct ia64_global_unwind_state unw;
282 
283 /* In user-level, we have no reasonable way of determining the base of
284    an arbitrary backing-store.  We default to half the
285    address-space.  */
286 #define rbs_get_base(c,bspstore,rbs_basep)				\
287 	(*(rbs_basep) = (bspstore) - (((unw_word_t) 1) << 63), 0)
288 
289 #endif /* IA64_LIBUNWIND_I_H */
290