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c906108c SS |
1 | /* Definitions to target GDB to GNU/Linux on 386. |
2 | Copyright 1992, 1993 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #ifndef TM_LINUX_H | |
22 | #define TM_LINUX_H | |
23 | ||
d4f3574e | 24 | #define I386_GNULINUX_TARGET |
917317f4 | 25 | #define HAVE_I387_REGS |
5c44784c JM |
26 | #ifdef HAVE_PTRACE_GETXFPREGS |
27 | #define HAVE_SSE_REGS | |
28 | #endif | |
c906108c SS |
29 | |
30 | #include "i386/tm-i386.h" | |
31 | ||
a0b3c4fd JM |
32 | /* Size of sigcontext, from <asm/sigcontext.h>. */ |
33 | #define LINUX_SIGCONTEXT_SIZE (88) | |
34 | ||
35 | /* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */ | |
36 | #define LINUX_SIGCONTEXT_PC_OFFSET (56) | |
37 | ||
38 | /* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */ | |
39 | #define LINUX_SIGCONTEXT_SP_OFFSET (28) | |
c906108c SS |
40 | |
41 | /* We need this file for the SOLIB_TRAMPOLINE stuff. */ | |
42 | ||
43 | #include "tm-sysv4.h" | |
44 | ||
d4f3574e SS |
45 | #define LOW_RETURN_REGNUM 0 /* holds low four bytes of result */ |
46 | #define HIGH_RETURN_REGNUM 2 /* holds high four bytes of result */ | |
47 | ||
917317f4 JM |
48 | /* This should probably move to tm-i386.h. */ |
49 | #define TARGET_LONG_DOUBLE_BIT 80 | |
d4f3574e SS |
50 | |
51 | #if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386) | |
52 | /* The host and target are i386 machines and the compiler supports | |
53 | long doubles. Long doubles on the host therefore have the same | |
54 | layout as a 387 FPU stack register. */ | |
55 | #define LD_I387 | |
d4f3574e | 56 | |
d4f3574e SS |
57 | extern int i387_extract_floating (PTR addr, int len, long double *dretptr); |
58 | extern int i387_store_floating (PTR addr, int len, long double val); | |
59 | ||
60 | #define TARGET_EXTRACT_FLOATING i387_extract_floating | |
61 | #define TARGET_STORE_FLOATING i387_store_floating | |
62 | ||
63 | #define TARGET_ANALYZE_FLOATING \ | |
64 | do \ | |
65 | { \ | |
66 | unsigned expon; \ | |
67 | \ | |
68 | low = extract_unsigned_integer (valaddr, 4); \ | |
69 | high = extract_unsigned_integer (valaddr + 4, 4); \ | |
70 | expon = extract_unsigned_integer (valaddr + 8, 2); \ | |
71 | \ | |
72 | nonnegative = ((expon & 0x8000) == 0); \ | |
73 | is_nan = ((expon & 0x7fff) == 0x7fff) \ | |
74 | && ((high & 0x80000000) == 0x80000000) \ | |
75 | && (((high & 0x7fffffff) | low) != 0); \ | |
76 | } \ | |
77 | while (0) | |
d4f3574e | 78 | |
917317f4 JM |
79 | #undef REGISTER_CONVERT_TO_VIRTUAL |
80 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \ | |
81 | { \ | |
82 | long double val = *((long double *)FROM); \ | |
83 | store_floating ((TO), TYPE_LENGTH (TYPE), val); \ | |
d4f3574e | 84 | } |
d4f3574e | 85 | |
917317f4 JM |
86 | #undef REGISTER_CONVERT_TO_RAW |
87 | #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \ | |
88 | { \ | |
89 | long double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ | |
90 | *((long double *)TO) = val; \ | |
d4f3574e | 91 | } |
d4f3574e SS |
92 | |
93 | /* Return the GDB type object for the "standard" data type | |
94 | of data in register N. */ | |
917317f4 | 95 | #undef REGISTER_VIRTUAL_TYPE |
5c44784c JM |
96 | #define REGISTER_VIRTUAL_TYPE(N) \ |
97 | (((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \ | |
98 | ? lookup_pointer_type (builtin_type_void) \ | |
99 | : IS_FP_REGNUM(N) ? builtin_type_long_double \ | |
100 | : IS_SSE_REGNUM(N) ? builtin_type_v4sf \ | |
101 | : builtin_type_int) | |
d4f3574e | 102 | |
d4f3574e SS |
103 | #endif |
104 | ||
c906108c SS |
105 | /* The following works around a problem with /usr/include/sys/procfs.h */ |
106 | #define sys_quotactl 1 | |
107 | ||
a0b3c4fd JM |
108 | /* When the i386 Linux kernel calls a signal handler, the return |
109 | address points to a bit of code on the stack. These definitions | |
110 | are used to identify this bit of code as a signal trampoline in | |
111 | order to support backtracing through calls to signal handlers. */ | |
112 | ||
113 | #define I386_LINUX_SIGTRAMP | |
114 | #define IN_SIGTRAMP(pc, name) ((name) == NULL && i386_linux_sigtramp (pc)) | |
115 | ||
116 | extern int i386_linux_sigtramp PARAMS ((CORE_ADDR)); | |
117 | ||
118 | /* We need our own version of sigtramp_saved_pc to get the saved PC in | |
119 | a sigtramp routine. */ | |
120 | ||
121 | #define sigtramp_saved_pc i386_linux_sigtramp_saved_pc | |
122 | extern CORE_ADDR i386_linux_sigtramp_saved_pc PARAMS ((struct frame_info *)); | |
123 | ||
124 | /* Signal trampolines don't have a meaningful frame. As in tm-i386.h, | |
125 | the frame pointer value we use is actually the frame pointer of the | |
126 | calling frame--that is, the frame which was in progress when the | |
127 | signal trampoline was entered. gdb mostly treats this frame | |
128 | pointer value as a magic cookie. We detect the case of a signal | |
129 | trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is | |
130 | set based on IN_SIGTRAMP. | |
131 | ||
132 | When a signal trampoline is invoked from a frameless function, we | |
133 | essentially have two frameless functions in a row. In this case, | |
134 | we use the same magic cookie for three frames in a row. We detect | |
135 | this case by seeing whether the next frame has | |
136 | SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the | |
137 | current frame is actually frameless. In this case, we need to get | |
138 | the PC by looking at the SP register value stored in the signal | |
139 | context. | |
140 | ||
141 | This should work in most cases except in horrible situations where | |
142 | a signal occurs just as we enter a function but before the frame | |
143 | has been set up. */ | |
144 | ||
145 | #define FRAMELESS_SIGNAL(FRAME) \ | |
146 | ((FRAME)->next != NULL \ | |
147 | && (FRAME)->next->signal_handler_caller \ | |
148 | && frameless_look_for_prologue (FRAME)) | |
149 | ||
150 | #undef FRAME_CHAIN | |
151 | #define FRAME_CHAIN(FRAME) \ | |
152 | ((FRAME)->signal_handler_caller \ | |
153 | ? (FRAME)->frame \ | |
154 | : (FRAMELESS_SIGNAL (FRAME) \ | |
155 | ? (FRAME)->frame \ | |
156 | : (!inside_entry_file ((FRAME)->pc) \ | |
157 | ? read_memory_integer ((FRAME)->frame, 4) \ | |
158 | : 0))) | |
159 | ||
160 | #undef FRAME_SAVED_PC | |
161 | #define FRAME_SAVED_PC(FRAME) \ | |
162 | ((FRAME)->signal_handler_caller \ | |
163 | ? sigtramp_saved_pc (FRAME) \ | |
164 | : (FRAMELESS_SIGNAL (FRAME) \ | |
165 | ? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \ | |
166 | : read_memory_integer ((FRAME)->frame + 4, 4))) | |
167 | ||
168 | extern CORE_ADDR i386_linux_sigtramp_saved_sp PARAMS ((struct frame_info *)); | |
169 | ||
d4f3574e SS |
170 | /* Some versions of Linux have real-time signal support in the C library, and |
171 | some don't. We have to include this file to find out. */ | |
172 | #include <signal.h> | |
173 | ||
174 | #ifdef __SIGRTMIN | |
175 | #define REALTIME_LO __SIGRTMIN | |
176 | #define REALTIME_HI (__SIGRTMAX + 1) | |
177 | #else | |
178 | #define REALTIME_LO 32 | |
179 | #define REALTIME_HI 64 | |
180 | #endif | |
181 | ||
182 | /* When we call a function in a shared library, and the PLT sends us | |
183 | into the dynamic linker to find the function's real address, we | |
184 | need to skip over the dynamic linker call. This function decides | |
185 | when to skip, and where to skip to. See the comments for | |
186 | SKIP_SOLIB_RESOLVER at the top of infrun.c. */ | |
187 | #define SKIP_SOLIB_RESOLVER i386_linux_skip_solib_resolver | |
188 | extern CORE_ADDR i386_linux_skip_solib_resolver (CORE_ADDR pc); | |
189 | ||
190 | /* N_FUN symbols in shared libaries have 0 for their values and need | |
191 | to be relocated. */ | |
192 | #define SOFUN_ADDRESS_MAYBE_MISSING | |
193 | ||
c5aa993b | 194 | #endif /* #ifndef TM_LINUX_H */ |