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1 /* libunwind - a platform-independent unwind library
2    Copyright (C) 2001-2004 Hewlett-Packard Co
3 	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4    Copyright (C) 2013 Linaro Limited
5 
6 This file is part of libunwind.
7 
8 Permission is hereby granted, free of charge, to any person obtaining
9 a copy of this software and associated documentation files (the
10 "Software"), to deal in the Software without restriction, including
11 without limitation the rights to use, copy, modify, merge, publish,
12 distribute, sublicense, and/or sell copies of the Software, and to
13 permit persons to whom the Software is furnished to do so, subject to
14 the following conditions:
15 
16 The above copyright notice and this permission notice shall be
17 included in all copies or substantial portions of the Software.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
26 
27 #ifndef LIBUNWIND_H
28 #define LIBUNWIND_H
29 
30 #if defined(__cplusplus) || defined(c_plusplus)
31 extern "C" {
32 #endif
33 
34 #include <inttypes.h>
35 #include <stddef.h>
36 #include <ucontext.h>
37 
38 #define UNW_TARGET	aarch64
39 #define UNW_TARGET_AARCH64	1
40 
41 #define _U_TDEP_QP_TRUE	0	/* see libunwind-dynamic.h  */
42 
43 /* This needs to be big enough to accommodate "struct cursor", while
44    leaving some slack for future expansion.  Changing this value will
45    require recompiling all users of this library.  Stack allocation is
46    relatively cheap and unwind-state copying is relatively rare, so we
47    want to err on making it rather too big than too small.  */
48 
49 #define UNW_TDEP_CURSOR_LEN	4096
50 
51 typedef uint64_t unw_word_t;
52 typedef int64_t unw_sword_t;
53 
54 typedef long double unw_tdep_fpreg_t;
55 
56 typedef struct
57   {
58     /* no aarch64-specific auxiliary proc-info */
59     /* ANDROID support update. */
60     char __reserved;
61     /* End of ANDROID update. */
62   }
63 unw_tdep_proc_info_t;
64 
65 typedef enum
66   {
67     /* 64-bit general registers.  */
68     UNW_AARCH64_X0,
69     UNW_AARCH64_X1,
70     UNW_AARCH64_X2,
71     UNW_AARCH64_X3,
72     UNW_AARCH64_X4,
73     UNW_AARCH64_X5,
74     UNW_AARCH64_X6,
75     UNW_AARCH64_X7,
76     UNW_AARCH64_X8,
77 
78     /* Temporary registers.  */
79     UNW_AARCH64_X9,
80     UNW_AARCH64_X10,
81     UNW_AARCH64_X11,
82     UNW_AARCH64_X12,
83     UNW_AARCH64_X13,
84     UNW_AARCH64_X14,
85     UNW_AARCH64_X15,
86 
87     /* Intra-procedure-call temporary registers.  */
88     UNW_AARCH64_X16,
89     UNW_AARCH64_X17,
90 
91     /* Callee-saved registers.  */
92     UNW_AARCH64_X18,
93     UNW_AARCH64_X19,
94     UNW_AARCH64_X20,
95     UNW_AARCH64_X21,
96     UNW_AARCH64_X22,
97     UNW_AARCH64_X23,
98     UNW_AARCH64_X24,
99     UNW_AARCH64_X25,
100     UNW_AARCH64_X26,
101     UNW_AARCH64_X27,
102     UNW_AARCH64_X28,
103 
104     /* 64-bit frame pointer.  */
105     UNW_AARCH64_X29,
106 
107     /* 64-bit link register.  */
108     UNW_AARCH64_X30,
109 
110     /* 64-bit stack pointer.  */
111     UNW_AARCH64_SP =  31,
112     UNW_AARCH64_PC,
113     UNW_AARCH64_PSTATE,
114 
115     /* 128-bit FP/Advanced SIMD registers.  */
116     UNW_AARCH64_V0 = 64,
117     UNW_AARCH64_V1,
118     UNW_AARCH64_V2,
119     UNW_AARCH64_V3,
120     UNW_AARCH64_V4,
121     UNW_AARCH64_V5,
122     UNW_AARCH64_V6,
123     UNW_AARCH64_V7,
124     UNW_AARCH64_V8,
125     UNW_AARCH64_V9,
126     UNW_AARCH64_V10,
127     UNW_AARCH64_V11,
128     UNW_AARCH64_V12,
129     UNW_AARCH64_V13,
130     UNW_AARCH64_V14,
131     UNW_AARCH64_V15,
132     UNW_AARCH64_V16,
133     UNW_AARCH64_V17,
134     UNW_AARCH64_V18,
135     UNW_AARCH64_V19,
136     UNW_AARCH64_V20,
137     UNW_AARCH64_V21,
138     UNW_AARCH64_V22,
139     UNW_AARCH64_V23,
140     UNW_AARCH64_V24,
141     UNW_AARCH64_V25,
142     UNW_AARCH64_V26,
143     UNW_AARCH64_V27,
144     UNW_AARCH64_V28,
145     UNW_AARCH64_V29,
146     UNW_AARCH64_V30,
147     UNW_AARCH64_V31,
148 
149     UNW_AARCH64_FPSR,
150     UNW_AARCH64_FPCR,
151 
152     /* For AArch64, the CFA is the value of SP (x31) at the call site of the
153        previous frame.  */
154     UNW_AARCH64_CFA = UNW_AARCH64_SP,
155 
156     UNW_TDEP_LAST_REG = UNW_AARCH64_FPCR,
157 
158     UNW_TDEP_IP = UNW_AARCH64_X30,
159     UNW_TDEP_SP = UNW_AARCH64_SP,
160     UNW_TDEP_EH = UNW_AARCH64_X0,
161 
162   }
163 aarch64_regnum_t;
164 
165 /* Use R0 through R3 to pass exception handling information.  */
166 #define UNW_TDEP_NUM_EH_REGS	4
167 
168 typedef struct unw_tdep_save_loc
169   {
170     /* Additional target-dependent info on a save location.  */
171     /* ANDROID support update. */
172     char __reserved;
173     /* End of ANDROID update. */
174   }
175 unw_tdep_save_loc_t;
176 
177 
178 /* On AArch64, we can directly use ucontext_t as the unwind context.  */
179 typedef ucontext_t unw_tdep_context_t;
180 
181 #include "libunwind-common.h"
182 #include "libunwind-dynamic.h"
183 
184 /* ANDROID support update. */
185 /* There is no getcontext in Android. */
186 #define unw_tdep_getcontext(uc) (({					\
187   unw_tdep_context_t *unw_ctx = (uc);					\
188   register uint64_t *unw_base asm ("x0") = (uint64_t*) unw_ctx->uc_mcontext.regs;		\
189   __asm__ __volatile__ (						\
190      "1:\n" \
191      "stp x0, x1, [%[base], #0]\n" \
192      "stp x2, x3, [%[base], #16]\n" \
193      "stp x4, x5, [%[base], #32]\n" \
194      "stp x6, x7, [%[base], #48]\n" \
195      "stp x8, x9, [%[base], #64]\n" \
196      "stp x10, x11, [%[base], #80]\n" \
197      "stp x12, x13, [%[base], #96]\n" \
198      "stp x14, x15, [%[base], #112]\n" \
199      "stp x16, x17, [%[base], #128]\n" \
200      "stp x18, x19, [%[base], #144]\n" \
201      "stp x20, x21, [%[base], #160]\n" \
202      "stp x22, x23, [%[base], #176]\n" \
203      "stp x24, x25, [%[base], #192]\n" \
204      "stp x26, x27, [%[base], #208]\n" \
205      "stp x28, x29, [%[base], #224]\n" \
206      "str x30, [%[base], #240]\n" \
207      "mov x1, sp\n" \
208      "adr x2, 1b\n" \
209      "stp x1, x2, [%[base], #248]\n" \
210      : [base] "+r" (unw_base) : : "x1", "x2", "memory"); \
211   }), 0)
212 /* End of ANDROID update. */
213 #define unw_tdep_is_fpreg		UNW_ARCH_OBJ(is_fpreg)
214 
215 extern int unw_tdep_is_fpreg (int);
216 
217 #if defined(__cplusplus) || defined(c_plusplus)
218 }
219 #endif
220 
221 #endif /* LIBUNWIND_H */
222