1 /* Target definitions for GNU/Linux on ARM, for GDB.
2 Copyright 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
25 #define ARM_GNULINUX_TARGET
28 /* Include the common ARM target definitions. */
29 #include "arm/tm-arm.h"
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 ()
37 #undef CALL_DUMMY_WORDS
38 #define CALL_DUMMY_WORDS arm_linux_call_dummy_words
39 extern LONGEST arm_linux_call_dummy_words
[];
41 /* Extract from an array REGBUF containing the (raw) register state
42 a function return value of type TYPE, and copy that, in virtual format,
46 extern void arm_linux_extract_return_value (struct type
*, char[], char *);
47 #undef EXTRACT_RETURN_VALUE
48 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
49 arm_linux_extract_return_value ((TYPE), (REGBUF), (VALBUF))
51 /* Things needed for making the inferior call functions.
53 FIXME: This and arm_push_arguments should be merged. However this
54 function breaks on a little endian host, big endian target
55 using the COFF file format. ELF is ok.
60 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
61 sp = arm_linux_push_arguments ((nargs), (args), (sp), (struct_return), \
63 extern CORE_ADDR
arm_linux_push_arguments (int, struct value
**, CORE_ADDR
,
66 /* The first page is not writeable in ARM Linux. */
68 #define LOWEST_PC 0x8000
70 /* Define NO_SINGLE_STEP if ptrace(PT_STEP,...) fails to function correctly
71 on ARM Linux. This is the case on 2.0.x kernels, 2.1.x kernels and some
72 2.2.x kernels. This will include the implementation of single_step()
73 in armlinux-tdep.c. See armlinux-ss.c for more details. */
74 /* #define NO_SINGLE_STEP 1 */
76 /* Offset to saved PC in sigcontext structure, from <asm/sigcontext.h> */
77 #define SIGCONTEXT_PC_OFFSET (sizeof(unsigned long) * 18)
79 /* Figure out where the longjmp will land. The code expects that longjmp
80 has just been entered and the code had not altered the registers, so
81 the arguments are are still in r0-r1. r0 points at the jmp_buf structure
82 from which the target pc (JB_PC) is extracted. This pc value is copied
83 into ADDR. This routine returns true on success */
84 extern int arm_get_longjmp_target (CORE_ADDR
*);
85 #define GET_LONGJMP_TARGET(addr) arm_get_longjmp_target (addr)
87 /* On ARM Linux, each call to a library routine goes through a small piece
88 of trampoline code in the ".plt" section. The wait_for_inferior()
89 routine uses this macro to detect when we have stepped into one of
90 these fragments. We do not use lookup_solib_trampoline_symbol_by_pc,
91 because we cannot always find the shared library trampoline symbols. */
92 extern int in_plt_section (CORE_ADDR
, char *);
93 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) in_plt_section((pc), (name))
95 /* On ARM Linux, a call to a library routine does not have to go through
96 any trampoline code. */
97 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) 0
99 /* If PC is in a shared library trampoline code, return the PC
100 where the function itself actually starts. If not, return 0. */
101 extern CORE_ADDR
find_solib_trampoline_target (CORE_ADDR pc
);
102 #define SKIP_TRAMPOLINE_CODE(pc) find_solib_trampoline_target (pc)
104 /* When we call a function in a shared library, and the PLT sends us
105 into the dynamic linker to find the function's real address, we
106 need to skip over the dynamic linker call. This function decides
107 when to skip, and where to skip to. See the comments for
108 SKIP_SOLIB_RESOLVER at the top of infrun.c. */
109 extern CORE_ADDR
arm_linux_skip_solib_resolver (CORE_ADDR pc
);
110 #define SKIP_SOLIB_RESOLVER arm_linux_skip_solib_resolver
112 /* When we call a function in a shared library, and the PLT sends us
113 into the dynamic linker to find the function's real address, we
114 need to skip over the dynamic linker call. This function decides
115 when to skip, and where to skip to. See the comments for
116 SKIP_SOLIB_RESOLVER at the top of infrun.c. */
118 #undef IN_SOLIB_DYNSYM_RESOLVE_CODE
119 extern CORE_ADDR
arm_in_solib_dynsym_resolve_code (CORE_ADDR pc
, char *name
);
120 #define IN_SOLIB_DYNSYM_RESOLVE_CODE arm_in_solib_dynsym_resolve_code
121 /* ScottB: Current definition is
122 extern CORE_ADDR in_svr4_dynsym_resolve_code (CORE_ADDR pc, char *name);
123 #define IN_SOLIB_DYNSYM_RESOLVE_CODE in_svr4_dynsym_resolve_code */
126 /* When the ARM Linux kernel invokes a signal handler, the return
127 address points at a special instruction which'll trap back into
128 the kernel. These definitions are used to identify this bit of
129 code as a signal trampoline in order to support backtracing
130 through calls to signal handlers. */
132 int arm_linux_in_sigtramp (CORE_ADDR pc
, char *name
);
133 #define IN_SIGTRAMP(pc, name) arm_linux_in_sigtramp (pc, name)
135 /* Each OS has different mechanisms for accessing the various
136 registers stored in the sigcontext structure. These definitions
137 provide a mechanism by which the generic code in arm-tdep.c can
138 find the addresses at which various registers are saved at in the
139 sigcontext structure. If SIGCONTEXT_REGISTER_ADDRESS is not
140 defined, arm-tdep.c will define it to be 0. (See ia64-tdep.c and
141 ia64-linux-tdep.c to see what a similar mechanism looks like when
144 extern CORE_ADDR
arm_linux_sigcontext_register_address (CORE_ADDR
, CORE_ADDR
,
146 #define SIGCONTEXT_REGISTER_ADDRESS arm_linux_sigcontext_register_address
148 #endif /* TM_ARMLINUX_H */