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authorFernando Nasser <fnasser@redhat.com>2002-09-30 15:57:26 +0000
committerFernando Nasser <fnasser@redhat.com>2002-09-30 15:57:26 +0000
commit45f45cb77cd153d18143e8e08a084730c9baef9f (patch)
tree67d2810e9149f056fb661065e981d681717c61d5 /gdb/disasm.c
parent31a3cca864323a55e47f205d60fcd4a177a85bcd (diff)
downloadgdb-45f45cb77cd153d18143e8e08a084730c9baef9f.tar.gz
* disasm.c: New file.
* disasm.h: New file. * mi/mi-cmd-disas.c (gdb_dis_asm_read_memory): Moved to disasm.c. (compare_lines): Ditto. (dump_insns): Ditto. (do_mixed_source_and_assembly): Moved to disasm.c. Added uiout argument. (do_assembly_only): Ditto. (do_disassembly): Renamed to gdb_disassembly and moved to disasm.c. Sdded uiout argument. * Makefile.in: Add new files. Reorder SFILES list. Update dependencies. Include libgdb.a later in the insight executable.
Diffstat (limited to 'gdb/disasm.c')
-rw-r--r--gdb/disasm.c374
1 files changed, 374 insertions, 0 deletions
diff --git a/gdb/disasm.c b/gdb/disasm.c
new file mode 100644
index 00000000000..8ce9a155166
--- /dev/null
+++ b/gdb/disasm.c
@@ -0,0 +1,374 @@
+/* Disassemble support for GDB.
+ Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "target.h"
+#include "value.h"
+#include "ui-out.h"
+#include "gdb_string.h"
+
+#include "disasm.h"
+
+/* Disassemble functions.
+ FIXME: We should get rid of all the duplicate code in gdb that does
+ the same thing: disassemble_command() and the gdbtk variation. */
+
+/* This Structure is used to store line number information.
+ We need a different sort of line table from the normal one cuz we can't
+ depend upon implicit line-end pc's for lines to do the
+ reordering in this function. */
+
+struct dis_line_entry
+{
+ int line;
+ CORE_ADDR start_pc;
+ CORE_ADDR end_pc;
+};
+
+/* This variable determines where memory used for disassembly is read from. */
+int gdb_disassemble_from_exec = -1;
+
+/* This is the memory_read_func for gdb_disassemble when we are
+ disassembling from the exec file. */
+static int
+gdb_dis_asm_read_memory (bfd_vma memaddr, bfd_byte * myaddr,
+ unsigned int len, disassemble_info * info)
+{
+ extern struct target_ops exec_ops;
+ int res;
+
+ errno = 0;
+ res = xfer_memory (memaddr, myaddr, len, 0, 0, &exec_ops);
+
+ if (res == len)
+ return 0;
+ else if (errno == 0)
+ return EIO;
+ else
+ return errno;
+}
+
+static int
+compare_lines (const PTR mle1p, const PTR mle2p)
+{
+ struct dis_line_entry *mle1, *mle2;
+ int val;
+
+ mle1 = (struct dis_line_entry *) mle1p;
+ mle2 = (struct dis_line_entry *) mle2p;
+
+ val = mle1->line - mle2->line;
+
+ if (val != 0)
+ return val;
+
+ return mle1->start_pc - mle2->start_pc;
+}
+
+static int
+dump_insns (struct ui_out *uiout, disassemble_info * di,
+ CORE_ADDR low, CORE_ADDR high,
+ int how_many, struct ui_stream *stb)
+{
+ int num_displayed = 0;
+ CORE_ADDR pc;
+
+ /* parts of the symbolic representation of the address */
+ int unmapped;
+ char *filename = NULL;
+ char *name = NULL;
+ int offset;
+ int line;
+
+ for (pc = low; pc < high;)
+ {
+ QUIT;
+ if (how_many >= 0)
+ {
+ if (num_displayed >= how_many)
+ break;
+ else
+ num_displayed++;
+ }
+ ui_out_tuple_begin (uiout, NULL);
+ ui_out_field_core_addr (uiout, "address", pc);
+
+ if (!build_address_symbolic (pc, 0, &name, &offset, &filename,
+ &line, &unmapped))
+ {
+ /* We don't care now about line, filename and
+ unmapped. But we might in the future. */
+ ui_out_text (uiout, " <");
+ ui_out_field_string (uiout, "func-name", name);
+ ui_out_text (uiout, "+");
+ ui_out_field_int (uiout, "offset", offset);
+ ui_out_text (uiout, ">:\t");
+ }
+ if (filename != NULL)
+ xfree (filename);
+ if (name != NULL)
+ xfree (name);
+
+ ui_file_rewind (stb->stream);
+ pc += TARGET_PRINT_INSN (pc, di);
+ ui_out_field_stream (uiout, "inst", stb);
+ ui_file_rewind (stb->stream);
+ ui_out_tuple_end (uiout);
+ ui_out_text (uiout, "\n");
+ }
+ return num_displayed;
+}
+
+/* The idea here is to present a source-O-centric view of a
+ function to the user. This means that things are presented
+ in source order, with (possibly) out of order assembly
+ immediately following. */
+static void
+do_mixed_source_and_assembly (struct ui_out *uiout,
+ struct disassemble_info *di, int nlines,
+ struct linetable_entry *le,
+ CORE_ADDR low, CORE_ADDR high,
+ struct symtab *symtab,
+ int how_many, struct ui_stream *stb)
+{
+ int newlines = 0;
+ struct dis_line_entry *mle;
+ struct symtab_and_line sal;
+ int i;
+ int out_of_order = 0;
+ int next_line = 0;
+ CORE_ADDR pc;
+ int num_displayed = 0;
+
+ mle = (struct dis_line_entry *) alloca (nlines
+ * sizeof (struct dis_line_entry));
+
+ /* Copy linetable entries for this function into our data
+ structure, creating end_pc's and setting out_of_order as
+ appropriate. */
+
+ /* First, skip all the preceding functions. */
+
+ for (i = 0; i < nlines - 1 && le[i].pc < low; i++);
+
+ /* Now, copy all entries before the end of this function. */
+
+ for (; i < nlines - 1 && le[i].pc < high; i++)
+ {
+ if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc)
+ continue; /* Ignore duplicates */
+
+ /* Skip any end-of-function markers. */
+ if (le[i].line == 0)
+ continue;
+
+ mle[newlines].line = le[i].line;
+ if (le[i].line > le[i + 1].line)
+ out_of_order = 1;
+ mle[newlines].start_pc = le[i].pc;
+ mle[newlines].end_pc = le[i + 1].pc;
+ newlines++;
+ }
+
+ /* If we're on the last line, and it's part of the function,
+ then we need to get the end pc in a special way. */
+
+ if (i == nlines - 1 && le[i].pc < high)
+ {
+ mle[newlines].line = le[i].line;
+ mle[newlines].start_pc = le[i].pc;
+ sal = find_pc_line (le[i].pc, 0);
+ mle[newlines].end_pc = sal.end;
+ newlines++;
+ }
+
+ /* Now, sort mle by line #s (and, then by addresses within
+ lines). */
+
+ if (out_of_order)
+ qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines);
+
+ /* Now, for each line entry, emit the specified lines (unless
+ they have been emitted before), followed by the assembly code
+ for that line. */
+
+ ui_out_list_begin (uiout, "asm_insns");
+
+ for (i = 0; i < newlines; i++)
+ {
+ int close_list = 1;
+ /* Print out everything from next_line to the current line. */
+ if (mle[i].line >= next_line)
+ {
+ if (next_line != 0)
+ {
+ /* Just one line to print. */
+ if (next_line == mle[i].line)
+ {
+ ui_out_tuple_begin (uiout, "src_and_asm_line");
+ print_source_lines (symtab, next_line, mle[i].line + 1, 0);
+ }
+ else
+ {
+ /* Several source lines w/o asm instructions associated. */
+ for (; next_line < mle[i].line; next_line++)
+ {
+ ui_out_tuple_begin (uiout, "src_and_asm_line");
+ print_source_lines (symtab, next_line, next_line + 1,
+ 0);
+ ui_out_list_begin (uiout, "line_asm_insn");
+ ui_out_list_end (uiout);
+ ui_out_tuple_end (uiout);
+ }
+ /* Print the last line and leave list open for
+ asm instructions to be added. */
+ ui_out_tuple_begin (uiout, "src_and_asm_line");
+ print_source_lines (symtab, next_line, mle[i].line + 1, 0);
+ }
+ }
+ else
+ {
+ ui_out_tuple_begin (uiout, "src_and_asm_line");
+ print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0);
+ }
+
+ next_line = mle[i].line + 1;
+ ui_out_list_begin (uiout, "line_asm_insn");
+ /* Don't close the list if the lines are not in order. */
+ if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line)
+ close_list = 0;
+ }
+
+ num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc,
+ how_many, stb);
+ if (close_list)
+ {
+ ui_out_list_end (uiout);
+ ui_out_tuple_end (uiout);
+ ui_out_text (uiout, "\n");
+ close_list = 0;
+ }
+ if (how_many >= 0)
+ if (num_displayed >= how_many)
+ break;
+ }
+ ui_out_list_end (uiout);
+}
+
+
+static void
+do_assembly_only (struct ui_out *uiout, disassemble_info * di,
+ CORE_ADDR low, CORE_ADDR high,
+ int how_many, struct ui_stream *stb)
+{
+ int num_displayed = 0;
+
+ ui_out_list_begin (uiout, "asm_insns");
+
+ num_displayed = dump_insns (uiout, di, low, high, how_many, stb);
+
+ ui_out_list_end (uiout);
+}
+
+void
+gdb_disassembly (struct ui_out *uiout,
+ char *file_string,
+ int line_num,
+ int mixed_source_and_assembly,
+ int how_many, CORE_ADDR low, CORE_ADDR high)
+{
+ static disassemble_info di;
+ static int di_initialized;
+ /* To collect the instruction outputted from opcodes. */
+ static struct ui_stream *stb = NULL;
+ struct symtab *symtab = NULL;
+ struct linetable_entry *le = NULL;
+ int nlines = -1;
+
+ if (!di_initialized)
+ {
+ /* We don't add a cleanup for this, because the allocation of
+ the stream is done once only for each gdb run, and we need to
+ keep it around until the end. Hopefully there won't be any
+ errors in the init code below, that make this function bail
+ out. */
+ stb = ui_out_stream_new (uiout);
+ INIT_DISASSEMBLE_INFO_NO_ARCH (di, stb->stream,
+ (fprintf_ftype) fprintf_unfiltered);
+ di.flavour = bfd_target_unknown_flavour;
+ di.memory_error_func = dis_asm_memory_error;
+ di.print_address_func = dis_asm_print_address;
+ di_initialized = 1;
+ }
+
+ di.mach = TARGET_PRINT_INSN_INFO->mach;
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ di.endian = BFD_ENDIAN_BIG;
+ else
+ di.endian = BFD_ENDIAN_LITTLE;
+
+ /* If gdb_disassemble_from_exec == -1, then we use the following heuristic to
+ determine whether or not to do disassembly from target memory or from the
+ exec file:
+
+ If we're debugging a local process, read target memory, instead of the
+ exec file. This makes disassembly of functions in shared libs work
+ correctly. Also, read target memory if we are debugging native threads.
+
+ Else, we're debugging a remote process, and should disassemble from the
+ exec file for speed. However, this is no good if the target modifies its
+ code (for relocation, or whatever). */
+
+ if (gdb_disassemble_from_exec == -1)
+ {
+ if (strcmp (target_shortname, "child") == 0
+ || strcmp (target_shortname, "procfs") == 0
+ || strcmp (target_shortname, "vxprocess") == 0
+ || strstr (target_shortname, "-threads") != NULL)
+ gdb_disassemble_from_exec = 0; /* It's a child process, read inferior mem */
+ else
+ gdb_disassemble_from_exec = 1; /* It's remote, read the exec file */
+ }
+
+ if (gdb_disassemble_from_exec)
+ di.read_memory_func = gdb_dis_asm_read_memory;
+ else
+ di.read_memory_func = dis_asm_read_memory;
+
+ /* Assume symtab is valid for whole PC range */
+ symtab = find_pc_symtab (low);
+
+ if (symtab != NULL && symtab->linetable != NULL)
+ {
+ /* Convert the linetable to a bunch of my_line_entry's. */
+ le = symtab->linetable->item;
+ nlines = symtab->linetable->nitems;
+ }
+
+ if (!mixed_source_and_assembly || nlines <= 0
+ || symtab == NULL || symtab->linetable == NULL)
+ do_assembly_only (uiout, &di, low, high, how_many, stb);
+
+ else if (mixed_source_and_assembly)
+ do_mixed_source_and_assembly (uiout, &di, nlines, le, low,
+ high, symtab, how_many, stb);
+
+ gdb_flush (gdb_stdout);
+}