9c4191458a
* disasm.h (DISASSEMBLY_OMIT_FNAME) New define. (gdb_disassembly): Correct parameter name. * disasm.c (dump_insns): Adjust. (gdb_disassembly): Fix indentation. * cli/cli-cmds.c (disassemble_command): Adjust. doc/ChangeLog: 2009-10-22 Paul Pluzhnikov <ppluzhnikov@google.com> * gdb.texinfo (Machine Code): Mention function name in disasssembly and adjust example. testsuite/ChangeLog: 2009-10-22 Paul Pluzhnikov <ppluzhnikov@google.com> * gdb.asm/asm-source.exp: Adjust.
431 lines
13 KiB
C
431 lines
13 KiB
C
/* Disassemble support for GDB.
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Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
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Free Software Foundation, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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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 "ui-out.h"
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#include "gdb_string.h"
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#include "disasm.h"
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#include "gdbcore.h"
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#include "dis-asm.h"
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/* Disassemble functions.
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FIXME: We should get rid of all the duplicate code in gdb that does
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the same thing: disassemble_command() and the gdbtk variation. */
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/* This Structure is used to store line number information.
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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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/* Like target_read_memory, but slightly different parameters. */
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static int
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dis_asm_read_memory (bfd_vma memaddr, gdb_byte *myaddr, unsigned int len,
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struct disassemble_info *info)
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{
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return target_read_memory (memaddr, myaddr, len);
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}
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/* Like memory_error with slightly different parameters. */
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static void
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dis_asm_memory_error (int status, bfd_vma memaddr,
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struct disassemble_info *info)
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{
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memory_error (status, memaddr);
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}
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/* Like print_address with slightly different parameters. */
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static void
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dis_asm_print_address (bfd_vma addr, struct disassemble_info *info)
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{
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struct gdbarch *gdbarch = info->application_data;
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print_address (gdbarch, addr, info->stream);
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}
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static int
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compare_lines (const void *mle1p, const void *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 (struct gdbarch *gdbarch, struct ui_out *uiout,
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struct disassemble_info * di,
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CORE_ADDR low, CORE_ADDR high,
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int how_many, int flags, 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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int offset;
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int line;
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struct cleanup *ui_out_chain;
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for (pc = low; pc < high;)
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{
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char *filename = NULL;
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char *name = NULL;
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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_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
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ui_out_text (uiout, pc_prefix (pc));
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ui_out_field_core_addr (uiout, "address", gdbarch, 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_text (uiout, " <");
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if ((flags & DISASSEMBLY_OMIT_FNAME) == 0)
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ui_out_field_string (uiout, "func-name", name);
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ui_out_text (uiout, "+");
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ui_out_field_int (uiout, "offset", offset);
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ui_out_text (uiout, ">:\t");
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}
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else
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ui_out_text (uiout, ":\t");
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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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if (flags & DISASSEMBLY_RAW_INSN)
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{
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CORE_ADDR old_pc = pc;
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bfd_byte data;
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int status;
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pc += gdbarch_print_insn (gdbarch, pc, di);
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for (;old_pc < pc; old_pc++)
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{
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status = (*di->read_memory_func) (old_pc, &data, 1, di);
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if (status != 0)
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(*di->memory_error_func) (status, old_pc, di);
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ui_out_message (uiout, 0, " %02x", (unsigned)data);
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}
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ui_out_text (uiout, "\t");
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}
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else
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pc += gdbarch_print_insn (gdbarch, 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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do_cleanups (ui_out_chain);
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ui_out_text (uiout, "\n");
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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 gdbarch *gdbarch, struct ui_out *uiout,
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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, int flags, 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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struct cleanup *ui_out_chain;
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struct cleanup *ui_out_tuple_chain = make_cleanup (null_cleanup, 0);
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struct cleanup *ui_out_list_chain = make_cleanup (null_cleanup, 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_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns");
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for (i = 0; i < newlines; i++)
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{
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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_chain
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= make_cleanup_ui_out_tuple_begin_end (uiout,
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"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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struct cleanup *ui_out_list_chain_line;
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struct cleanup *ui_out_tuple_chain_line;
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ui_out_tuple_chain_line
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= make_cleanup_ui_out_tuple_begin_end (uiout,
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"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_chain_line
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= make_cleanup_ui_out_list_begin_end (uiout,
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"line_asm_insn");
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do_cleanups (ui_out_list_chain_line);
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do_cleanups (ui_out_tuple_chain_line);
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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_chain
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= make_cleanup_ui_out_tuple_begin_end (uiout,
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"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_chain
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= make_cleanup_ui_out_tuple_begin_end (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_chain
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= make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn");
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}
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num_displayed += dump_insns (gdbarch, uiout, di,
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mle[i].start_pc, mle[i].end_pc,
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how_many, flags, stb);
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/* When we've reached the end of the mle array, or we've seen the last
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assembly range for this source line, close out the list/tuple. */
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if (i == (newlines - 1) || mle[i + 1].line > mle[i].line)
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{
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do_cleanups (ui_out_list_chain);
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do_cleanups (ui_out_tuple_chain);
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ui_out_tuple_chain = make_cleanup (null_cleanup, 0);
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ui_out_list_chain = make_cleanup (null_cleanup, 0);
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ui_out_text (uiout, "\n");
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}
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if (how_many >= 0 && num_displayed >= how_many)
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break;
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}
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do_cleanups (ui_out_chain);
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}
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static void
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do_assembly_only (struct gdbarch *gdbarch, struct ui_out *uiout,
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struct disassemble_info * di,
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CORE_ADDR low, CORE_ADDR high,
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int how_many, int flags, struct ui_stream *stb)
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{
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int num_displayed = 0;
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struct cleanup *ui_out_chain;
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ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns");
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num_displayed = dump_insns (gdbarch, uiout, di, low, high, how_many,
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flags, stb);
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do_cleanups (ui_out_chain);
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}
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/* Initialize the disassemble info struct ready for the specified
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stream. */
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static int ATTR_FORMAT (printf, 2, 3)
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fprintf_disasm (void *stream, const char *format, ...)
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{
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va_list args;
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va_start (args, format);
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vfprintf_filtered (stream, format, args);
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va_end (args);
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/* Something non -ve. */
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return 0;
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}
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static struct disassemble_info
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gdb_disassemble_info (struct gdbarch *gdbarch, struct ui_file *file)
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{
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struct disassemble_info di;
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init_disassemble_info (&di, file, fprintf_disasm);
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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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/* NOTE: cagney/2003-04-28: The original code, from the old Insight
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disassembler had a local optomization here. By default it would
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access the executable file, instead of the target memory (there
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was a growing list of exceptions though). Unfortunately, the
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heuristic was flawed. Commands like "disassemble &variable"
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didn't work as they relied on the access going to the target.
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Further, it has been supperseeded by trust-read-only-sections
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(although that should be superseeded by target_trust..._p()). */
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di.read_memory_func = dis_asm_read_memory;
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di.arch = gdbarch_bfd_arch_info (gdbarch)->arch;
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di.mach = gdbarch_bfd_arch_info (gdbarch)->mach;
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di.endian = gdbarch_byte_order (gdbarch);
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di.endian_code = gdbarch_byte_order_for_code (gdbarch);
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di.application_data = gdbarch;
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disassemble_init_for_target (&di);
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return di;
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}
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void
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gdb_disassembly (struct gdbarch *gdbarch, struct ui_out *uiout,
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char *file_string, int flags, int how_many,
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CORE_ADDR low, CORE_ADDR high)
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{
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struct ui_stream *stb = ui_out_stream_new (uiout);
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struct cleanup *cleanups = make_cleanup_ui_out_stream_delete (stb);
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struct disassemble_info di = gdb_disassemble_info (gdbarch, stb->stream);
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/* To collect the instruction outputted from opcodes. */
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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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/* 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 (!(flags & DISASSEMBLY_SOURCE) || nlines <= 0
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|| symtab == NULL || symtab->linetable == NULL)
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do_assembly_only (gdbarch, uiout, &di, low, high, how_many, flags, stb);
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else if (flags & DISASSEMBLY_SOURCE)
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do_mixed_source_and_assembly (gdbarch, uiout, &di, nlines, le, low,
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high, symtab, how_many, flags, stb);
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do_cleanups (cleanups);
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gdb_flush (gdb_stdout);
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}
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/* Print the instruction at address MEMADDR in debugged memory,
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on STREAM. Returns the length of the instruction, in bytes,
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and, if requested, the number of branch delay slot instructions. */
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int
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gdb_print_insn (struct gdbarch *gdbarch, CORE_ADDR memaddr,
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struct ui_file *stream, int *branch_delay_insns)
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{
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struct disassemble_info di;
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int length;
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di = gdb_disassemble_info (gdbarch, stream);
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length = gdbarch_print_insn (gdbarch, memaddr, &di);
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if (branch_delay_insns)
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{
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if (di.insn_info_valid)
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*branch_delay_insns = di.branch_delay_insns;
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else
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*branch_delay_insns = 0;
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}
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return length;
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}
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