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ed9a39eb | 1 | /* Target definitions for GNU/Linux on ARM, for GDB. |
ef57c069 | 2 | Copyright 1999, 2000 Free Software Foundation, Inc. |
ed9a39eb JM |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. */ | |
20 | ||
21 | #ifndef TM_ARMLINUX_H | |
22 | #define TM_ARMLINUX_H | |
23 | ||
ae45a35b KW |
24 | #ifdef GDBSERVER |
25 | #define ARM_GNULINUX_TARGET | |
26 | #endif | |
27 | ||
ed9a39eb JM |
28 | /* Include the common ARM target definitions. */ |
29 | #include "arm/tm-arm.h" | |
30 | ||
31 | #include "tm-linux.h" | |
32 | ||
a42dd537 KB |
33 | /* Use target-specific function to define link map offsets. */ |
34 | extern struct link_map_offsets *arm_linux_svr4_fetch_link_map_offsets (void); | |
35 | #define SVR4_FETCH_LINK_MAP_OFFSETS() arm_linux_svr4_fetch_link_map_offsets () | |
36 | ||
134e61c4 | 37 | /* Target byte order on ARM Linux is little endian and not selectable. */ |
ed9a39eb | 38 | #undef TARGET_BYTE_ORDER_SELECTABLE_P |
134e61c4 | 39 | #define TARGET_BYTE_ORDER_SELECTABLE_P 0 |
ed9a39eb JM |
40 | |
41 | /* Under ARM Linux the traditional way of performing a breakpoint is to | |
42 | execute a particular software interrupt, rather than use a particular | |
43 | undefined instruction to provoke a trap. Upon exection of the software | |
44 | interrupt the kernel stops the inferior with a SIGTRAP, and wakes the | |
45 | debugger. Since ARM Linux is little endian, and doesn't support Thumb | |
46 | at the moment we redefined ARM_LE_BREAKPOINT to use the correct software | |
47 | interrupt. */ | |
48 | #undef ARM_LE_BREAKPOINT | |
49 | #define ARM_LE_BREAKPOINT {0x01,0x00,0x9f,0xef} | |
50 | ||
51 | /* This sequence of words used in the CALL_DUMMY are the following | |
52 | instructions: | |
53 | ||
54 | mov lr, pc | |
55 | mov pc, r4 | |
56 | swi bkpt_swi | |
57 | ||
58 | Note this is 12 bytes. */ | |
59 | ||
60 | #undef CALL_DUMMY | |
61 | #define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xef9f001} | |
62 | ||
63 | /* Extract from an array REGBUF containing the (raw) register state | |
64 | a function return value of type TYPE, and copy that, in virtual format, | |
65 | into VALBUF. */ | |
66 | extern void arm_linux_extract_return_value (struct type *, char[], char *); | |
67 | #undef EXTRACT_RETURN_VALUE | |
68 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
69 | arm_linux_extract_return_value ((TYPE), (REGBUF), (VALBUF)) | |
70 | ||
134e61c4 SB |
71 | /* Things needed for making the inferior call functions. |
72 | ||
73 | FIXME: This and arm_push_arguments should be merged. However this | |
74 | function breaks on a little endian host, big endian target | |
75 | using the COFF file format. ELF is ok. | |
76 | ||
77 | ScottB. */ | |
78 | ||
79 | #undef PUSH_ARGUMENTS | |
80 | #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ | |
81 | sp = arm_linux_push_arguments ((nargs), (args), (sp), (struct_return), \ | |
82 | (struct_addr)) | |
83 | extern CORE_ADDR arm_linux_push_arguments (int, struct value **, CORE_ADDR, | |
84 | int, CORE_ADDR); | |
85 | ||
ed9a39eb | 86 | /* The first page is not writeable in ARM Linux. */ |
b8fb9dd9 | 87 | #undef LOWEST_PC |
ed9a39eb JM |
88 | #define LOWEST_PC 0x8000 |
89 | ||
90 | /* Define NO_SINGLE_STEP if ptrace(PT_STEP,...) fails to function correctly | |
91 | on ARM Linux. This is the case on 2.0.x kernels, 2.1.x kernels and some | |
92 | 2.2.x kernels. This will include the implementation of single_step() | |
93 | in armlinux-tdep.c. See armlinux-ss.c for more details. */ | |
94 | /* #define NO_SINGLE_STEP 1 */ | |
95 | ||
96 | /* Offset to saved PC in sigcontext structure, from <asm/sigcontext.h> */ | |
97 | #define SIGCONTEXT_PC_OFFSET (sizeof(unsigned long) * 18) | |
98 | ||
99 | /* Figure out where the longjmp will land. The code expects that longjmp | |
100 | has just been entered and the code had not altered the registers, so | |
101 | the arguments are are still in r0-r1. r0 points at the jmp_buf structure | |
102 | from which the target pc (JB_PC) is extracted. This pc value is copied | |
103 | into ADDR. This routine returns true on success */ | |
104 | extern int arm_get_longjmp_target (CORE_ADDR *); | |
105 | #define GET_LONGJMP_TARGET(addr) arm_get_longjmp_target (addr) | |
106 | ||
107 | /* On ARM Linux, each call to a library routine goes through a small piece | |
108 | of trampoline code in the ".plt" section. The wait_for_inferior() | |
109 | routine uses this macro to detect when we have stepped into one of | |
110 | these fragments. We do not use lookup_solib_trampoline_symbol_by_pc, | |
111 | because we cannot always find the shared library trampoline symbols. */ | |
112 | extern int in_plt_section (CORE_ADDR, char *); | |
113 | #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) in_plt_section((pc), (name)) | |
114 | ||
115 | /* On ARM Linux, a call to a library routine does not have to go through | |
116 | any trampoline code. */ | |
117 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) 0 | |
118 | ||
119 | /* If PC is in a shared library trampoline code, return the PC | |
120 | where the function itself actually starts. If not, return 0. */ | |
121 | extern CORE_ADDR find_solib_trampoline_target (CORE_ADDR pc); | |
122 | #define SKIP_TRAMPOLINE_CODE(pc) find_solib_trampoline_target (pc) | |
123 | ||
124 | /* When we call a function in a shared library, and the PLT sends us | |
125 | into the dynamic linker to find the function's real address, we | |
126 | need to skip over the dynamic linker call. This function decides | |
127 | when to skip, and where to skip to. See the comments for | |
128 | SKIP_SOLIB_RESOLVER at the top of infrun.c. */ | |
a52e6aac SB |
129 | extern CORE_ADDR arm_linux_skip_solib_resolver (CORE_ADDR pc); |
130 | #define SKIP_SOLIB_RESOLVER arm_linux_skip_solib_resolver | |
ed9a39eb JM |
131 | |
132 | /* When we call a function in a shared library, and the PLT sends us | |
133 | into the dynamic linker to find the function's real address, we | |
134 | need to skip over the dynamic linker call. This function decides | |
135 | when to skip, and where to skip to. See the comments for | |
136 | SKIP_SOLIB_RESOLVER at the top of infrun.c. */ | |
137 | #if 0 | |
138 | #undef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
139 | extern CORE_ADDR arm_in_solib_dynsym_resolve_code (CORE_ADDR pc, char *name); | |
140 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE arm_in_solib_dynsym_resolve_code | |
141 | /* ScottB: Current definition is | |
142 | extern CORE_ADDR in_svr4_dynsym_resolve_code (CORE_ADDR pc, char *name); | |
143 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE in_svr4_dynsym_resolve_code */ | |
144 | #endif | |
145 | ||
2a451106 KB |
146 | /* When the ARM Linux kernel invokes a signal handler, the return |
147 | address points at a special instruction which'll trap back into | |
148 | the kernel. These definitions are used to identify this bit of | |
149 | code as a signal trampoline in order to support backtracing | |
150 | through calls to signal handlers. */ | |
151 | ||
152 | int arm_linux_in_sigtramp (CORE_ADDR pc, char *name); | |
153 | #define IN_SIGTRAMP(pc, name) arm_linux_in_sigtramp (pc, name) | |
154 | ||
155 | /* Each OS has different mechanisms for accessing the various | |
156 | registers stored in the sigcontext structure. These definitions | |
157 | provide a mechanism by which the generic code in arm-tdep.c can | |
158 | find the addresses at which various registers are saved at in the | |
159 | sigcontext structure. If SIGCONTEXT_REGISTER_ADDRESS is not | |
160 | defined, arm-tdep.c will define it to be 0. (See ia64-tdep.c and | |
161 | ia64-linux-tdep.c to see what a similar mechanism looks like when | |
162 | multi-arched.) */ | |
163 | ||
164 | extern CORE_ADDR arm_linux_sigcontext_register_address (CORE_ADDR, CORE_ADDR, | |
165 | int); | |
166 | #define SIGCONTEXT_REGISTER_ADDRESS arm_linux_sigcontext_register_address | |
167 | ||
ed9a39eb | 168 | #endif /* TM_ARMLINUX_H */ |