500 lines
14 KiB
C
500 lines
14 KiB
C
/* MI Command Set - disassemble commands.
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Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions (a Red Hat company).
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "target.h"
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#include "value.h"
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#include "mi-cmds.h"
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#include "mi-getopt.h"
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#include "ui-out.h"
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/* Disassemble functions. FIXME: these do not really belong here. We
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should get rid of all the duplicate code in gdb that does the same
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thing: disassemble_command() and the gdbtk variation. */
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/* This Structure is used in mi_cmd_disassemble.
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We need a different sort of line table from the normal one cuz we can't
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depend upon implicit line-end pc's for lines to do the
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reordering in this function. */
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struct dis_line_entry
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{
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int line;
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CORE_ADDR start_pc;
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CORE_ADDR end_pc;
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};
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/* This variable determines where memory used for disassembly is read from. */
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int gdb_disassemble_from_exec = -1;
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/* This is the memory_read_func for gdb_disassemble when we are
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disassembling from the exec file. */
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static int
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gdb_dis_asm_read_memory (bfd_vma memaddr, bfd_byte * myaddr,
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unsigned int len, disassemble_info * info)
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{
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extern struct target_ops exec_ops;
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int res;
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errno = 0;
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res = xfer_memory (memaddr, myaddr, len, 0, 0, &exec_ops);
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if (res == len)
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return 0;
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else if (errno == 0)
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return EIO;
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else
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return errno;
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}
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static int
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compare_lines (const PTR mle1p, const PTR mle2p)
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{
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struct dis_line_entry *mle1, *mle2;
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int val;
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mle1 = (struct dis_line_entry *) mle1p;
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mle2 = (struct dis_line_entry *) mle2p;
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val = mle1->line - mle2->line;
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if (val != 0)
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return val;
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return mle1->start_pc - mle2->start_pc;
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}
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static int
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dump_insns (disassemble_info * di, CORE_ADDR low, CORE_ADDR high,
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int how_many, struct ui_stream *stb)
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{
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int num_displayed = 0;
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CORE_ADDR pc;
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/* parts of the symbolic representation of the address */
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int unmapped;
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char *filename = NULL;
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char *name = NULL;
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int offset;
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int line;
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for (pc = low; pc < high;)
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{
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QUIT;
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if (how_many >= 0)
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{
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if (num_displayed >= how_many)
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break;
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else
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num_displayed++;
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}
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ui_out_tuple_begin (uiout, NULL);
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ui_out_field_core_addr (uiout, "address", pc);
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if (!build_address_symbolic (pc, 0, &name, &offset, &filename,
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&line, &unmapped))
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{
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/* We don't care now about line, filename and
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unmapped. But we might in the future. */
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ui_out_field_string (uiout, "func-name", name);
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ui_out_field_int (uiout, "offset", offset);
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}
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if (filename != NULL)
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xfree (filename);
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if (name != NULL)
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xfree (name);
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ui_file_rewind (stb->stream);
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pc += TARGET_PRINT_INSN (pc, di);
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ui_out_field_stream (uiout, "inst", stb);
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ui_file_rewind (stb->stream);
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ui_out_tuple_end (uiout);
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}
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return num_displayed;
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}
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/* The idea here is to present a source-O-centric view of a
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function to the user. This means that things are presented
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in source order, with (possibly) out of order assembly
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immediately following. */
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static void
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do_mixed_source_and_assembly (struct disassemble_info *di, int nlines,
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struct linetable_entry *le,
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CORE_ADDR low, CORE_ADDR high,
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struct symtab *symtab,
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int how_many, struct ui_stream *stb)
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{
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int newlines = 0;
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struct dis_line_entry *mle;
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struct symtab_and_line sal;
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int i;
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int out_of_order = 0;
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int next_line = 0;
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CORE_ADDR pc;
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int num_displayed = 0;
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mle = (struct dis_line_entry *) alloca (nlines
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* sizeof (struct dis_line_entry));
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/* Copy linetable entries for this function into our data
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structure, creating end_pc's and setting out_of_order as
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appropriate. */
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/* First, skip all the preceding functions. */
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for (i = 0; i < nlines - 1 && le[i].pc < low; i++);
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/* Now, copy all entries before the end of this function. */
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for (; i < nlines - 1 && le[i].pc < high; i++)
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{
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if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc)
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continue; /* Ignore duplicates */
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/* Skip any end-of-function markers. */
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if (le[i].line == 0)
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continue;
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mle[newlines].line = le[i].line;
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if (le[i].line > le[i + 1].line)
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out_of_order = 1;
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mle[newlines].start_pc = le[i].pc;
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mle[newlines].end_pc = le[i + 1].pc;
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newlines++;
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}
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/* If we're on the last line, and it's part of the function,
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then we need to get the end pc in a special way. */
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if (i == nlines - 1 && le[i].pc < high)
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{
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mle[newlines].line = le[i].line;
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mle[newlines].start_pc = le[i].pc;
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sal = find_pc_line (le[i].pc, 0);
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mle[newlines].end_pc = sal.end;
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newlines++;
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}
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/* Now, sort mle by line #s (and, then by addresses within
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lines). */
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if (out_of_order)
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qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines);
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/* Now, for each line entry, emit the specified lines (unless
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they have been emitted before), followed by the assembly code
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for that line. */
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ui_out_list_begin (uiout, "asm_insns");
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for (i = 0; i < newlines; i++)
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{
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int close_list = 1;
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/* Print out everything from next_line to the current line. */
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if (mle[i].line >= next_line)
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{
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if (next_line != 0)
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{
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/* Just one line to print. */
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if (next_line == mle[i].line)
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{
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ui_out_tuple_begin (uiout, "src_and_asm_line");
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print_source_lines (symtab, next_line, mle[i].line + 1, 0);
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}
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else
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{
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/* Several source lines w/o asm instructions associated. */
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for (; next_line < mle[i].line; next_line++)
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{
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ui_out_tuple_begin (uiout, "src_and_asm_line");
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print_source_lines (symtab, next_line, next_line + 1,
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0);
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ui_out_list_begin (uiout, "line_asm_insn");
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ui_out_list_end (uiout);
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ui_out_tuple_end (uiout);
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}
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/* Print the last line and leave list open for
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asm instructions to be added. */
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ui_out_tuple_begin (uiout, "src_and_asm_line");
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print_source_lines (symtab, next_line, mle[i].line + 1, 0);
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}
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}
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else
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{
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ui_out_tuple_begin (uiout, "src_and_asm_line");
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print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0);
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}
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next_line = mle[i].line + 1;
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ui_out_list_begin (uiout, "line_asm_insn");
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/* Don't close the list if the lines are not in order. */
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if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line)
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close_list = 0;
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}
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num_displayed += dump_insns (di, mle[i].start_pc, mle[i].end_pc,
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how_many, stb);
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if (close_list)
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{
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ui_out_list_end (uiout);
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ui_out_tuple_end (uiout);
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close_list = 0;
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}
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if (how_many >= 0)
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if (num_displayed >= how_many)
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break;
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}
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ui_out_list_end (uiout);
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}
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static void
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do_assembly_only (disassemble_info * di, CORE_ADDR low,
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CORE_ADDR high, int how_many, struct ui_stream *stb)
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{
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int num_displayed = 0;
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ui_out_list_begin (uiout, "asm_insns");
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num_displayed = dump_insns (di, low, high, how_many, stb);
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ui_out_list_end (uiout);
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}
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enum mi_cmd_result
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do_disassembly (char *file_string,
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int line_num,
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int mixed_source_and_assembly,
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int how_many, CORE_ADDR low, CORE_ADDR high)
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{
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static disassemble_info di;
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static int di_initialized;
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/* To collect the instruction outputted from opcodes. */
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static struct ui_stream *stb = NULL;
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struct symtab *symtab = NULL;
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struct linetable_entry *le = NULL;
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int nlines = -1;
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if (!di_initialized)
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{
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/* We don't add a cleanup for this, because the allocation of
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the stream is done once only for each gdb run, and we need to
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keep it around until the end. Hopefully there won't be any
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errors in the init code below, that make this function bail
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out. */
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stb = ui_out_stream_new (uiout);
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INIT_DISASSEMBLE_INFO_NO_ARCH (di, stb->stream,
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(fprintf_ftype) fprintf_unfiltered);
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di.flavour = bfd_target_unknown_flavour;
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di.memory_error_func = dis_asm_memory_error;
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di.print_address_func = dis_asm_print_address;
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di_initialized = 1;
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}
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di.mach = TARGET_PRINT_INSN_INFO->mach;
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if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
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di.endian = BFD_ENDIAN_BIG;
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else
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di.endian = BFD_ENDIAN_LITTLE;
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/* If gdb_disassemble_from_exec == -1, then we use the following heuristic to
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determine whether or not to do disassembly from target memory or from the
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exec file:
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If we're debugging a local process, read target memory, instead of the
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exec file. This makes disassembly of functions in shared libs work
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correctly. Also, read target memory if we are debugging native threads.
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Else, we're debugging a remote process, and should disassemble from the
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exec file for speed. However, this is no good if the target modifies its
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code (for relocation, or whatever). */
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if (gdb_disassemble_from_exec == -1)
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{
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if (strcmp (target_shortname, "child") == 0
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|| strcmp (target_shortname, "procfs") == 0
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|| strcmp (target_shortname, "vxprocess") == 0
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|| strstr (target_shortname, "-threads") != NULL)
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gdb_disassemble_from_exec = 0; /* It's a child process, read inferior mem */
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else
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gdb_disassemble_from_exec = 1; /* It's remote, read the exec file */
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}
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if (gdb_disassemble_from_exec)
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di.read_memory_func = gdb_dis_asm_read_memory;
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else
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di.read_memory_func = dis_asm_read_memory;
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/* Assume symtab is valid for whole PC range */
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symtab = find_pc_symtab (low);
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if (symtab != NULL && symtab->linetable != NULL)
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{
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/* Convert the linetable to a bunch of my_line_entry's. */
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le = symtab->linetable->item;
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nlines = symtab->linetable->nitems;
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}
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if (!mixed_source_and_assembly || nlines <= 0
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|| symtab == NULL || symtab->linetable == NULL)
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do_assembly_only (&di, low, high, how_many, stb);
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else if (mixed_source_and_assembly)
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do_mixed_source_and_assembly (&di, nlines, le, low,
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high, symtab, how_many, stb);
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gdb_flush (gdb_stdout);
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return MI_CMD_DONE;
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}
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/* The arguments to be passed on the command line and parsed here are:
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either:
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START-ADDRESS: address to start the disassembly at.
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END-ADDRESS: address to end the disassembly at.
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or:
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FILENAME: The name of the file where we want disassemble from.
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LINE: The line around which we want to disassemble. It will
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disassemble the function that contins that line.
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HOW_MANY: Number of disassembly lines to display. In mixed mode, it
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is the number of disassembly lines only, not counting the source
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lines.
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always required:
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MODE: 0 or 1 for disassembly only, or mixed source and disassembly,
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respectively. */
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enum mi_cmd_result
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mi_cmd_disassemble (char *command, char **argv, int argc)
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{
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enum mi_cmd_result retval;
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CORE_ADDR start;
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int mixed_source_and_assembly;
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struct symtab *s;
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/* Which options have we processed ... */
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int file_seen = 0;
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int line_seen = 0;
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int num_seen = 0;
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int start_seen = 0;
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int end_seen = 0;
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/* ... and their corresponding value. */
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char *file_string = NULL;
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int line_num = -1;
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int how_many = -1;
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CORE_ADDR low = 0;
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CORE_ADDR high = 0;
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/* Options processing stuff. */
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int optind = 0;
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char *optarg;
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enum opt
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{
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FILE_OPT, LINE_OPT, NUM_OPT, START_OPT, END_OPT
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};
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static struct mi_opt opts[] = {
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{"f", FILE_OPT, 1},
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{"l", LINE_OPT, 1},
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{"n", NUM_OPT, 1},
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{"s", START_OPT, 1},
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{"e", END_OPT, 1},
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0
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};
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/* Get the options with their arguments. Keep track of what we
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encountered. */
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while (1)
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{
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int opt = mi_getopt ("mi_cmd_disassemble", argc, argv, opts,
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&optind, &optarg);
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if (opt < 0)
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break;
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switch ((enum opt) opt)
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{
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case FILE_OPT:
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file_string = xstrdup (optarg);
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file_seen = 1;
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break;
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case LINE_OPT:
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line_num = atoi (optarg);
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line_seen = 1;
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break;
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case NUM_OPT:
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how_many = atoi (optarg);
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num_seen = 1;
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break;
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case START_OPT:
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low = parse_and_eval_address (optarg);
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start_seen = 1;
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break;
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case END_OPT:
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high = parse_and_eval_address (optarg);
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end_seen = 1;
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break;
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}
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}
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argv += optind;
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argc -= optind;
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/* Allow only filename + linenum (with how_many which is not
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required) OR start_addr + and_addr */
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if (!((line_seen && file_seen && num_seen && !start_seen && !end_seen)
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|| (line_seen && file_seen && !num_seen && !start_seen && !end_seen)
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|| (!line_seen && !file_seen && !num_seen && start_seen && end_seen)))
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error
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("mi_cmd_disassemble: Usage: ( [-f filename -l linenum [-n howmany]] | [-s startaddr -e endaddr]) [--] mixed_mode.");
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if (argc != 1)
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error
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("mi_cmd_disassemble: Usage: [-f filename -l linenum [-n howmany]] [-s startaddr -e endaddr] [--] mixed_mode.");
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mixed_source_and_assembly = atoi (argv[0]);
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if ((mixed_source_and_assembly != 0) && (mixed_source_and_assembly != 1))
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error ("mi_cmd_disassemble: Mixed_mode argument must be 0 or 1.");
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/* We must get the function beginning and end where line_num is
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contained. */
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if (line_seen && file_seen)
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{
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s = lookup_symtab (file_string);
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if (s == NULL)
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error ("mi_cmd_disassemble: Invalid filename.");
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if (!find_line_pc (s, line_num, &start))
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error ("mi_cmd_disassemble: Invalid line number");
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if (find_pc_partial_function (start, NULL, &low, &high) == 0)
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error ("mi_cmd_disassemble: No function contains specified address");
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}
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retval = do_disassembly (file_string,
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line_num,
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mixed_source_and_assembly, how_many, low, high);
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return retval;
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}
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