libunwind-mips.h revision 7ff83c051e33de1adbcbc20bf63ea368c2745a70 
1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2008 CodeSourcery
3
4This file is part of libunwind.
5
6Permission is hereby granted, free of charge, to any person obtaining
7a copy of this software and associated documentation files (the
8"Software"), to deal in the Software without restriction, including
9without limitation the rights to use, copy, modify, merge, publish,
10distribute, sublicense, and/or sell copies of the Software, and to
11permit persons to whom the Software is furnished to do so, subject to
12the following conditions:
13
14The above copyright notice and this permission notice shall be
15included in all copies or substantial portions of the Software.
16
17THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
24
25#ifndef LIBUNWIND_H
26#define LIBUNWIND_H
27
28#if defined(__cplusplus) || defined(c_plusplus)
29extern "C" {
30#endif
31
32#include <inttypes.h>
33#include <ucontext.h>
34
35#ifdef mips
36# undef mips
37#endif
38
39#define UNW_TARGET	mips
40#define UNW_TARGET_MIPS	1
41
42#define _U_TDEP_QP_TRUE	0	/* see libunwind-dynamic.h  */
43
44/* This needs to be big enough to accommodate "struct cursor", while
45   leaving some slack for future expansion.  Changing this value will
46   require recompiling all users of this library.  Stack allocation is
47   relatively cheap and unwind-state copying is relatively rare, so we
48   want to err on making it rather too big than too small.  */
49
50/* FIXME for MIPS. Too big?  What do other things use for similar tasks?  */
51#define UNW_TDEP_CURSOR_LEN	4096
52
53/* The size of a "word" varies on MIPS.  This type is used for memory
54   addresses and register values.  To allow a single library to support
55   multiple ABIs, and to support N32 at all, we must use a 64-bit type
56   even when addresses are only 32 bits.  */
57typedef uint64_t unw_word_t;
58typedef int32_t unw_sword_t;
59
60/* FIXME: MIPS ABIs.  */
61typedef long double unw_tdep_fpreg_t;
62
63typedef enum
64  {
65    UNW_MIPS_R0,
66    UNW_MIPS_R1,
67    UNW_MIPS_R2,
68    UNW_MIPS_R3,
69    UNW_MIPS_R4,
70    UNW_MIPS_R5,
71    UNW_MIPS_R6,
72    UNW_MIPS_R7,
73    UNW_MIPS_R8,
74    UNW_MIPS_R9,
75    UNW_MIPS_R10,
76    UNW_MIPS_R11,
77    UNW_MIPS_R12,
78    UNW_MIPS_R13,
79    UNW_MIPS_R14,
80    UNW_MIPS_R15,
81    UNW_MIPS_R16,
82    UNW_MIPS_R17,
83    UNW_MIPS_R18,
84    UNW_MIPS_R19,
85    UNW_MIPS_R20,
86    UNW_MIPS_R21,
87    UNW_MIPS_R22,
88    UNW_MIPS_R23,
89    UNW_MIPS_R24,
90    UNW_MIPS_R25,
91    UNW_MIPS_R26,
92    UNW_MIPS_R27,
93    UNW_MIPS_R28,
94    UNW_MIPS_R29,
95    UNW_MIPS_R30,
96    UNW_MIPS_R31,
97
98    /* FIXME: Other registers!  */
99
100    /* For MIPS, the CFA is the value of SP (r29) at the call site in the
101       previous frame.  */
102    UNW_MIPS_CFA,
103
104    UNW_TDEP_LAST_REG = UNW_MIPS_R31,
105
106    UNW_TDEP_IP = UNW_MIPS_R31,
107    UNW_TDEP_SP = UNW_MIPS_R29,
108    UNW_TDEP_EH = UNW_MIPS_R0   /* FIXME.  */
109  }
110mips_regnum_t;
111
112typedef enum
113  {
114    UNW_MIPS_ABI_O32,
115    UNW_MIPS_ABI_N32,
116    UNW_MIPS_ABI_N64
117  }
118mips_abi_t;
119
120#define UNW_TDEP_NUM_EH_REGS	2	/* FIXME for MIPS.  */
121
122typedef struct unw_tdep_save_loc
123  {
124    /* Additional target-dependent info on a save location.  */
125  }
126unw_tdep_save_loc_t;
127
128/* On x86, we can directly use ucontext_t as the unwind context.  FIXME for
129   MIPS.  */
130typedef ucontext_t unw_tdep_context_t;
131
132#include "libunwind-dynamic.h"
133
134typedef struct
135  {
136    /* no mips-specific auxiliary proc-info */
137  }
138unw_tdep_proc_info_t;
139
140typedef struct
141  {
142    /* no mips-specific fast trace */
143  }
144unw_tdep_frame_t;
145
146#include "libunwind-common.h"
147
148/* There is no getcontext() on MIPS.  Use a stub version which only saves GP
149   registers.  FIXME: Not ideal, may not be sufficient for all libunwind
150   use cases.  */
151#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
152extern int unw_tdep_getcontext (ucontext_t *uc);
153
154#define unw_tdep_is_fpreg		UNW_ARCH_OBJ(is_fpreg)
155extern int unw_tdep_is_fpreg (int);
156
157#define unw_tdep_trace(cur,addr,n)	(-UNW_ENOINFO)
158
159#if defined(__cplusplus) || defined(c_plusplus)
160}
161#endif
162
163#endif /* LIBUNWIND_H */
164