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1 /* libunwind - a platform-independent unwind library
2    Copyright (C) 2002-2004 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 LIBUNWIND_H
27 #define LIBUNWIND_H
28 
29 #if defined(__cplusplus) || defined(c_plusplus)
30 extern "C" {
31 #endif
32 
33 #include <sys/types.h>
34 #include <inttypes.h>
35 #include <ucontext.h>
36 
37 #define UNW_TARGET	x86
38 #define UNW_TARGET_X86	1
39 
40 #define _U_TDEP_QP_TRUE	0	/* see libunwind-dynamic.h  */
41 
42 /* This needs to be big enough to accommodate "struct cursor", while
43    leaving some slack for future expansion.  Changing this value will
44    require recompiling all users of this library.  Stack allocation is
45    relatively cheap and unwind-state copying is relatively rare, so we
46    want to err on making it rather too big than too small.  */
47 #define UNW_TDEP_CURSOR_LEN	127
48 
49 typedef uint32_t unw_word_t;
50 typedef int32_t unw_sword_t;
51 
52 typedef union {
53   struct { uint8_t b[4]; } val32;
54   struct { uint8_t b[10]; } val80;
55   struct { uint8_t b[16]; } val128;
56 } unw_tdep_fpreg_t;
57 
58 typedef enum
59   {
60     /* Note: general registers are expected to start with index 0.
61        This convention facilitates architecture-independent
62        implementation of the C++ exception handling ABI.  See
63        _Unwind_SetGR() and _Unwind_GetGR() for details.
64 
65        The described register usage convention is based on "System V
66        Application Binary Interface, Intel386 Architecture Processor
67        Supplement, Fourth Edition" at
68 
69          http://www.linuxbase.org/spec/refspecs/elf/abi386-4.pdf
70 
71        It would have been nice to use the same register numbering as
72        DWARF, but that doesn't work because the libunwind requires
73        that the exception argument registers be consecutive, which the
74        wouldn't be with the DWARF numbering.  */
75     UNW_X86_EAX,	/* scratch (exception argument 1) */
76     UNW_X86_EDX,	/* scratch (exception argument 2) */
77     UNW_X86_ECX,	/* scratch */
78     UNW_X86_EBX,	/* preserved */
79     UNW_X86_ESI,	/* preserved */
80     UNW_X86_EDI,	/* preserved */
81     UNW_X86_EBP,	/* (optional) frame-register */
82     UNW_X86_ESP,	/* (optional) frame-register */
83     UNW_X86_EIP,	/* frame-register */
84     UNW_X86_EFLAGS,	/* scratch (except for "direction", which is fixed */
85     UNW_X86_TRAPNO,	/* scratch */
86 
87     /* MMX/stacked-fp registers */
88     UNW_X86_ST0,	/* fp return value */
89     UNW_X86_ST1,	/* scratch */
90     UNW_X86_ST2,	/* scratch */
91     UNW_X86_ST3,	/* scratch */
92     UNW_X86_ST4,	/* scratch */
93     UNW_X86_ST5,	/* scratch */
94     UNW_X86_ST6,	/* scratch */
95     UNW_X86_ST7,	/* scratch */
96 
97     UNW_X86_FCW,	/* scratch */
98     UNW_X86_FSW,	/* scratch */
99     UNW_X86_FTW,	/* scratch */
100     UNW_X86_FOP,	/* scratch */
101     UNW_X86_FCS,	/* scratch */
102     UNW_X86_FIP,	/* scratch */
103     UNW_X86_FEA,	/* scratch */
104     UNW_X86_FDS,	/* scratch */
105 
106     /* SSE registers */
107     UNW_X86_XMM0_lo,	/* scratch */
108     UNW_X86_XMM0_hi,	/* scratch */
109     UNW_X86_XMM1_lo,	/* scratch */
110     UNW_X86_XMM1_hi,	/* scratch */
111     UNW_X86_XMM2_lo,	/* scratch */
112     UNW_X86_XMM2_hi,	/* scratch */
113     UNW_X86_XMM3_lo,	/* scratch */
114     UNW_X86_XMM3_hi,	/* scratch */
115     UNW_X86_XMM4_lo,	/* scratch */
116     UNW_X86_XMM4_hi,	/* scratch */
117     UNW_X86_XMM5_lo,	/* scratch */
118     UNW_X86_XMM5_hi,	/* scratch */
119     UNW_X86_XMM6_lo,	/* scratch */
120     UNW_X86_XMM6_hi,	/* scratch */
121     UNW_X86_XMM7_lo,	/* scratch */
122     UNW_X86_XMM7_hi,	/* scratch */
123 
124     UNW_X86_MXCSR,	/* scratch */
125 
126     /* segment registers */
127     UNW_X86_GS,		/* special */
128     UNW_X86_FS,		/* special */
129     UNW_X86_ES,		/* special */
130     UNW_X86_DS,		/* special */
131     UNW_X86_SS,		/* special */
132     UNW_X86_CS,		/* special */
133     UNW_X86_TSS,	/* special */
134     UNW_X86_LDT,	/* special */
135 
136     /* frame info (read-only) */
137     UNW_X86_CFA,
138 
139     UNW_X86_XMM0,	/* scratch */
140     UNW_X86_XMM1,	/* scratch */
141     UNW_X86_XMM2,	/* scratch */
142     UNW_X86_XMM3,	/* scratch */
143     UNW_X86_XMM4,	/* scratch */
144     UNW_X86_XMM5,	/* scratch */
145     UNW_X86_XMM6,	/* scratch */
146     UNW_X86_XMM7,	/* scratch */
147 
148     UNW_TDEP_LAST_REG = UNW_X86_XMM7,
149 
150     UNW_TDEP_IP = UNW_X86_EIP,
151     UNW_TDEP_SP = UNW_X86_ESP,
152     UNW_TDEP_EH = UNW_X86_EAX
153   }
154 x86_regnum_t;
155 
156 #define UNW_TDEP_NUM_EH_REGS	2	/* eax and edx are exception args */
157 
158 typedef struct unw_tdep_save_loc
159   {
160     /* Additional target-dependent info on a save location.  */
161     /* ANDROID support update. */
162     char __reserved;
163     /* End of ANDROID update. */
164   }
165 unw_tdep_save_loc_t;
166 
167 /* On x86, we can directly use ucontext_t as the unwind context.  */
168 typedef ucontext_t unw_tdep_context_t;
169 
170 #include "libunwind-dynamic.h"
171 
172 typedef struct
173   {
174     /* no x86-specific auxiliary proc-info */
175     /* ANDROID support update. */
176     char __reserved;
177     /* End of ANDROID update. */
178   }
179 unw_tdep_proc_info_t;
180 
181 #include "libunwind-common.h"
182 
183 #define unw_tdep_getcontext		UNW_ARCH_OBJ(getcontext)
184 extern int unw_tdep_getcontext (unw_tdep_context_t *);
185 
186 #define unw_tdep_is_fpreg		UNW_ARCH_OBJ(is_fpreg)
187 extern int unw_tdep_is_fpreg (int);
188 
189 #if defined(__cplusplus) || defined(c_plusplus)
190 }
191 #endif
192 
193 #endif /* LIBUNWIND_H */
194