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308a5981e0
data_size, insn_type, target, target2. These are used to return information from the instruction decoders back to the calling program. Add comments, make more readable.
177 lines
6.7 KiB
C
177 lines
6.7 KiB
C
/* Interface between the opcode library and its callers.
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Written by Cygnus Support, 1993.
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The opcode library (libopcodes.a) provides instruction decoders for
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a large variety of instruction sets, callable with an identical
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interface, for making instruction-processing programs more independent
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of the instruction set being processed. */
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#include <stdio.h>
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#include "bfd.h"
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typedef int (*fprintf_ftype) PARAMS((FILE*, const char*, ...));
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/* This struct is passed into the instruction decoding routine,
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and is passed back out into each callback. The various fields are used
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for conveying information from your main routine into your callbacks,
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for passing information into the instruction decoders (such as the
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addresses of the callback functions), or for passing information
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back from the instruction decoders to their callers.
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It must be initialized before it is first passed; this can be done
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by hand, or using one of the initialization macros below. */
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typedef struct disassemble_info {
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fprintf_ftype fprintf_func;
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FILE *stream;
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PTR application_data;
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/* For use by the disassembler. */
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int flags;
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PTR private_data;
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/* Function used to get bytes to disassemble. MEMADDR is the
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address of the stuff to be disassembled, MYADDR is the address to
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put the bytes in, and LENGTH is the number of bytes to read.
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INFO is a pointer to this struct.
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Returns an errno value or 0 for success. */
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int (*read_memory_func)
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PARAMS ((bfd_vma memaddr, bfd_byte *myaddr, int length,
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struct disassemble_info *info));
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/* Function which should be called if we get an error that we can't
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recover from. STATUS is the errno value from read_memory_func and
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MEMADDR is the address that we were trying to read. INFO is a
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pointer to this struct. */
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void (*memory_error_func)
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PARAMS ((int status, bfd_vma memaddr, struct disassemble_info *info));
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/* Function called to print ADDR. */
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void (*print_address_func)
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PARAMS ((bfd_vma addr, struct disassemble_info *info));
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/* These are for buffer_read_memory. */
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bfd_byte *buffer;
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bfd_vma buffer_vma;
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int buffer_length;
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/* Results from instruction decoders. Not all decoders yet support
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this information. This info is set each time an instruction is
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decoded, and is only valid for the last such instruction.
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To determine whether this decoder supports this information, set
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insn_info_valid to 0, decode an instruction, then check it. */
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enum dis_insn_type {
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dis_noninsn, /* Not a valid instruction */
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dis_nonbranch, /* Not a branch instruction */
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dis_branch, /* Unconditional branch */
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dis_condbranch, /* Conditional branch */
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dis_jsr, /* Jump to subroutine */
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dis_condjsr, /* Conditional jump to subroutine */
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dis_dref, /* Data reference instruction */
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dis_dref2, /* Two data references in instruction */
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};
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char insn_info_valid; /* Branch info has been set. */
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char branch_delay_insns; /* How many sequential insn's will run before
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a branch takes effect. (0 = normal) */
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char data_size; /* Size of data reference in insn, in bytes */
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enum dis_insn_type insn_type; /* Type of instruction */
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bfd_vma target; /* Target address of branch or dref, if known;
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zero if unknown. */
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bfd_vma target2; /* Second target address for dref2 */
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} disassemble_info;
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/* Standard disassemblers. Disassemble one instruction at the given
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target address. Return number of bytes processed. */
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typedef int (*disassembler_ftype)
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PARAMS((bfd_vma, disassemble_info *));
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extern int print_insn_big_mips PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_little_mips PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_i386 PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_m68k PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_z8001 PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_z8002 PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_h8300 PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_h8300h PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_h8500 PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_alpha PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_sparc PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_big_a29k PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_little_a29k PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_i960 PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_sh PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_hppa PARAMS ((bfd_vma, disassemble_info*));
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extern int print_insn_m88k PARAMS ((bfd_vma, disassemble_info*));
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/* This block of definitions is for particular callers who read instructions
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into a buffer before calling the instruction decoder. */
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/* Here is a function which callers may wish to use for read_memory_func.
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It gets bytes from a buffer. */
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extern int buffer_read_memory
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PARAMS ((bfd_vma, bfd_byte *, int, struct disassemble_info *));
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/* This function goes with buffer_read_memory.
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It prints a message using info->fprintf_func and info->stream. */
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extern void perror_memory PARAMS ((int, bfd_vma, struct disassemble_info *));
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/* Just print the address is hex. This is included for completeness even
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though both GDB and objdump provide their own (to print symbolic
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addresses). */
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extern void generic_print_address
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PARAMS ((bfd_vma, struct disassemble_info *));
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#define INIT_DISASSEMBLE_INFO(INFO, STREAM) \
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(INFO).fprintf_func = (fprintf_ftype)fprintf, \
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(INFO).stream = (STREAM), \
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(INFO).buffer = NULL, \
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(INFO).buffer_vma = 0, \
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(INFO).buffer_length = 0, \
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(INFO).read_memory_func = buffer_read_memory, \
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(INFO).memory_error_func = perror_memory, \
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(INFO).print_address_func = generic_print_address, \
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(INFO).insn_info_valid = 0
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/* This block of definitions is for calling the instruction decoders
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from GDB. */
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/* GDB--Like target_read_memory, but slightly different parameters. */
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extern int
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dis_asm_read_memory PARAMS ((bfd_vma memaddr, bfd_byte *myaddr, int len,
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disassemble_info *info));
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/* GDB--Like memory_error with slightly different parameters. */
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extern void
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dis_asm_memory_error
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PARAMS ((int status, bfd_vma memaddr, disassemble_info *info));
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/* GDB--Like print_address with slightly different parameters. */
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extern void
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dis_asm_print_address PARAMS ((bfd_vma addr, disassemble_info *info));
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#define GDB_INIT_DISASSEMBLE_INFO(INFO, STREAM) \
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(INFO).fprintf_func = (fprintf_ftype)fprintf_filtered, \
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(INFO).stream = (STREAM), \
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(INFO).read_memory_func = dis_asm_read_memory, \
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(INFO).memory_error_func = dis_asm_memory_error, \
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(INFO).print_address_func = dis_asm_print_address, \
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(INFO).insn_info_valid = 0
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