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1 /* Interface between the opcode library and its callers.
3 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
4 Free Software Foundation, Inc.
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, or (at your option)
9 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., 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA.
21 Written by Cygnus Support, 1993.
23 The opcode library (libopcodes.a) provides instruction decoders for
24 a large variety of instruction sets, callable with an identical
25 interface, for making instruction-processing programs more independent
26 of the instruction set being processed. */
28 #ifndef DIS_ASM_H
29 #define DIS_ASM_H
31 #ifdef __cplusplus
33 #endif
35 #include <stdio.h>
40 enum dis_insn_type
41 {
49 dis_dref2 /* Two data references in instruction */
50 };
52 /* This struct is passed into the instruction decoding routine,
53 and is passed back out into each callback. The various fields are used
54 for conveying information from your main routine into your callbacks,
55 for passing information into the instruction decoders (such as the
56 addresses of the callback functions), or for passing information
57 back from the instruction decoders to their callers.
59 It must be initialized before it is first passed; this can be done
60 by hand, or using one of the initialization macros below. */
63 {
64 fprintf_ftype fprintf_func;
68 /* Target description. We could replace this with a pointer to the bfd,
69 but that would require one. There currently isn't any such requirement
70 so to avoid introducing one we record these explicitly. */
71 /* The bfd_flavour. This can be bfd_target_unknown_flavour. */
73 /* The bfd_arch value. */
75 /* The bfd_mach value. */
77 /* Endianness (for bi-endian cpus). Mono-endian cpus can ignore this. */
79 /* An arch/mach-specific bitmask of selected instruction subsets, mainly
80 for processors with run-time-switchable instruction sets. The default,
81 zero, means that there is no constraint. CGEN-based opcodes ports
82 may use ISA_foo masks. */
85 /* Some targets need information about the current section to accurately
86 display insns. If this is NULL, the target disassembler function
87 will have to make its best guess. */
90 /* An array of pointers to symbols either at the location being disassembled
91 or at the start of the function being disassembled. The array is sorted
92 so that the first symbol is intended to be the one used. The others are
93 present for any misc. purposes. This is not set reliably, but if it is
94 not NULL, it is correct. */
96 /* Number of symbols in array. */
99 /* Symbol table provided for targets that want to look at it. This is
100 used on Arm to find mapping symbols and determine Arm/Thumb code. */
105 /* For use by the disassembler.
106 The top 16 bits are reserved for public use (and are documented here).
107 The bottom 16 bits are for the internal use of the disassembler. */
109 #define INSN_HAS_RELOC 0x80000000
112 /* Function used to get bytes to disassemble. MEMADDR is the
113 address of the stuff to be disassembled, MYADDR is the address to
114 put the bytes in, and LENGTH is the number of bytes to read.
115 INFO is a pointer to this struct.
116 Returns an errno value or 0 for success. */
121 /* Function which should be called if we get an error that we can't
122 recover from. STATUS is the errno value from read_memory_func and
123 MEMADDR is the address that we were trying to read. INFO is a
124 pointer to this struct. */
128 /* Function called to print ADDR. */
132 /* Function called to determine if there is a symbol at the given ADDR.
133 If there is, the function returns 1, otherwise it returns 0.
134 This is used by ports which support an overlay manager where
135 the overlay number is held in the top part of an address. In
136 some circumstances we want to include the overlay number in the
137 address, (normally because there is a symbol associated with
138 that address), but sometimes we want to mask out the overlay bits. */
142 /* Function called to check if a SYMBOL is can be displayed to the user.
143 This is used by some ports that want to hide special symbols when
144 displaying debugging outout. */
148 /* These are for buffer_read_memory. */
150 bfd_vma buffer_vma;
153 /* This variable may be set by the instruction decoder. It suggests
154 the number of bytes objdump should display on a single line. If
155 the instruction decoder sets this, it should always set it to
156 the same value in order to get reasonable looking output. */
159 /* The next two variables control the way objdump displays the raw data. */
160 /* For example, if bytes_per_line is 8 and bytes_per_chunk is 4, the */
161 /* output will look like this:
162 00: 00000000 00000000
163 with the chunks displayed according to "display_endian". */
167 /* Number of octets per incremented target address
168 Normally one, but some DSPs have byte sizes of 16 or 32 bits. */
171 /* The number of zeroes we want to see at the end of a section before we
172 start skipping them. */
175 /* The number of zeroes to skip at the end of a section. If the number
176 of zeroes at the end is between SKIP_ZEROES_AT_END and SKIP_ZEROES,
177 they will be disassembled. If there are fewer than
178 SKIP_ZEROES_AT_END, they will be skipped. This is a heuristic
179 attempt to avoid disassembling zeroes inserted by section
180 alignment. */
183 /* Whether the disassembler always needs the relocations. */
184 bfd_boolean disassembler_needs_relocs;
186 /* Results from instruction decoders. Not all decoders yet support
187 this information. This info is set each time an instruction is
188 decoded, and is only valid for the last such instruction.
190 To determine whether this decoder supports this information, set
191 insn_info_valid to 0, decode an instruction, then check it. */
195 a branch takes effect. (0 = normal) */
199 zero if unknown. */
202 /* Command line options specific to the target disassembler. */
207 \f
208 /* Standard disassemblers. Disassemble one instruction at the given
209 target address. Return number of octets processed. */
296 /* Fetch the disassembler for a given BFD, if that support is available. */
299 /* Amend the disassemble_info structure as necessary for the target architecture.
300 Should only be called after initialising the info->arch field. */
303 /* Document any target specific options available from the disassembler. */
306 \f
307 /* This block of definitions is for particular callers who read instructions
308 into a buffer before calling the instruction decoder. */
310 /* Here is a function which callers may wish to use for read_memory_func.
311 It gets bytes from a buffer. */
315 /* This function goes with buffer_read_memory.
316 It prints a message using info->fprintf_func and info->stream. */
320 /* Just print the address in hex. This is included for completeness even
321 though both GDB and objdump provide their own (to print symbolic
322 addresses). */
326 /* Always true. */
330 /* Also always true. */
331 extern bfd_boolean generic_symbol_is_valid
334 /* Method to initialize a disassemble_info struct. This should be
335 called by all applications creating such a struct. */
337 fprintf_ftype fprintf_func);
339 /* For compatibility with existing code. */
340 #define INIT_DISASSEMBLE_INFO(INFO, STREAM, FPRINTF_FUNC) \
341 init_disassemble_info (&(INFO), (STREAM), (fprintf_ftype) (FPRINTF_FUNC))
342 #define INIT_DISASSEMBLE_INFO_NO_ARCH(INFO, STREAM, FPRINTF_FUNC) \
343 init_disassemble_info (&(INFO), (STREAM), (fprintf_ftype) (FPRINTF_FUNC))
346 #ifdef __cplusplus
347 }
348 #endif