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binutils-gdb/gdb/tui/tui-disasm.c

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/* Disassembly display.
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
Foundation, Inc.
Contributed by Hewlett-Packard Company.
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 "symtab.h"
#include "breakpoint.h"
#include "frame.h"
#include "value.h"
#include "source.h"
#include "disasm.h"
#include "gdb_string.h"
#include "tui/tui.h"
#include "tui/tui-data.h"
#include "tui/tui-win.h"
#include "tui/tui-layout.h"
#include "tui/tui-winsource.h"
#include "tui/tui-stack.h"
#include "tui/tui-file.h"
#include "gdb_curses.h"
struct tui_asm_line
{
CORE_ADDR addr;
char* addr_string;
char* insn;
};
/* Function to set the disassembly window's content.
Disassemble count lines starting at pc.
Return address of the count'th instruction after pc. */
static CORE_ADDR
tui_disassemble (struct tui_asm_line* asm_lines, CORE_ADDR pc, int count)
{
struct ui_file *gdb_dis_out;
/* now init the ui_file structure */
gdb_dis_out = tui_sfileopen (256);
/* Now construct each line */
for (; count > 0; count--, asm_lines++)
{
if (asm_lines->addr_string)
xfree (asm_lines->addr_string);
if (asm_lines->insn)
xfree (asm_lines->insn);
print_address (pc, gdb_dis_out);
asm_lines->addr = pc;
asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out));
ui_file_rewind (gdb_dis_out);
pc = pc + gdb_print_insn (pc, gdb_dis_out);
asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out));
/* reset the buffer to empty */
ui_file_rewind (gdb_dis_out);
}
ui_file_delete (gdb_dis_out);
return pc;
}
/* Find the disassembly address that corresponds to FROM lines
above or below the PC. Variable sized instructions are taken
into account by the algorithm. */
static CORE_ADDR
tui_find_disassembly_address (CORE_ADDR pc, int from)
{
CORE_ADDR new_low;
int max_lines;
int i;
struct tui_asm_line* asm_lines;
max_lines = (from > 0) ? from : - from;
if (max_lines <= 1)
return pc;
asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
* max_lines);
memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
new_low = pc;
if (from > 0)
{
tui_disassemble (asm_lines, pc, max_lines);
new_low = asm_lines[max_lines - 1].addr;
}
else
{
CORE_ADDR last_addr;
int pos;
struct minimal_symbol* msymbol;
/* Find backward an address which is a symbol
and for which disassembling from that address will fill
completely the window. */
pos = max_lines - 1;
do {
new_low -= 1 * max_lines;
msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);
if (msymbol)
new_low = SYMBOL_VALUE_ADDRESS (msymbol);
else
new_low += 1 * max_lines;
tui_disassemble (asm_lines, new_low, max_lines);
last_addr = asm_lines[pos].addr;
} while (last_addr > pc && msymbol);
/* Scan forward disassembling one instruction at a time
until the last visible instruction of the window
matches the pc. We keep the disassembled instructions
in the 'lines' window and shift it downward (increasing
its addresses). */
if (last_addr < pc)
do
{
CORE_ADDR next_addr;
pos++;
if (pos >= max_lines)
pos = 0;
next_addr = tui_disassemble (&asm_lines[pos], last_addr, 1);
/* If there are some problems while disassembling exit. */
if (next_addr <= last_addr)
break;
last_addr = next_addr;
} while (last_addr <= pc);
pos++;
if (pos >= max_lines)
pos = 0;
new_low = asm_lines[pos].addr;
}
for (i = 0; i < max_lines; i++)
{
xfree (asm_lines[i].addr_string);
xfree (asm_lines[i].insn);
}
return new_low;
}
/* Function to set the disassembly window's content. */
enum tui_status
tui_set_disassem_content (CORE_ADDR pc)
{
enum tui_status ret = TUI_FAILURE;
int i;
int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset;
int line_width, max_lines;
CORE_ADDR cur_pc;
struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
int tab_len = tui_default_tab_len ();
struct tui_asm_line* asm_lines;
int insn_pos;
int addr_size, max_size;
char* line;
if (pc == 0)
return TUI_FAILURE;
ret = tui_alloc_source_buffer (TUI_DISASM_WIN);
if (ret != TUI_SUCCESS)
return ret;
TUI_DISASM_WIN->detail.source_info.start_line_or_addr.addr = pc;
cur_pc = (CORE_ADDR)
(((struct tui_win_element *) locator->content[0])->which_element.locator.addr);
max_lines = TUI_DISASM_WIN->generic.height - 2; /* account for hilite */
/* Get temporary table that will hold all strings (addr & insn). */
asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
* max_lines);
memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
line_width = TUI_DISASM_WIN->generic.width - 1;
tui_disassemble (asm_lines, pc, max_lines);
/* See what is the maximum length of an address and of a line. */
addr_size = 0;
max_size = 0;
for (i = 0; i < max_lines; i++)
{
size_t len = strlen (asm_lines[i].addr_string);
if (len > addr_size)
addr_size = len;
len = strlen (asm_lines[i].insn) + tab_len;
if (len > max_size)
max_size = len;
}
max_size += addr_size + tab_len;
/* Allocate memory to create each line. */
line = (char*) alloca (max_size);
insn_pos = (1 + (addr_size / tab_len)) * tab_len;
/* Now construct each line */
for (i = 0; i < max_lines; i++)
{
struct tui_win_element * element;
struct tui_source_element* src;
int cur_len;
element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];
src = &element->which_element.source;
strcpy (line, asm_lines[i].addr_string);
cur_len = strlen (line);
/* Add spaces to make the instructions start on the same column */
while (cur_len < insn_pos)
{
strcat (line, " ");
cur_len++;
}
strcat (line, asm_lines[i].insn);
/* Now copy the line taking the offset into account */
if (strlen (line) > offset)
strcpy (src->line, &line[offset]);
else
src->line[0] = '\0';
src->line_or_addr.addr = asm_lines[i].addr;
src->is_exec_point = asm_lines[i].addr == cur_pc;
/* See whether there is a breakpoint installed. */
src->has_break = (!src->is_exec_point
&& breakpoint_here_p (pc) != no_breakpoint_here);
xfree (asm_lines[i].addr_string);
xfree (asm_lines[i].insn);
}
TUI_DISASM_WIN->generic.content_size = i;
return TUI_SUCCESS;
}
/* Function to display the disassembly window with disassembled code. */
void
tui_show_disassem (CORE_ADDR start_addr)
{
struct symtab *s = find_pc_symtab (start_addr);
struct tui_win_info * win_with_focus = tui_win_with_focus ();
union tui_line_or_address val;
val.addr = start_addr;
tui_add_win_to_layout (DISASSEM_WIN);
tui_update_source_window (TUI_DISASM_WIN, s, val, FALSE);
/*
** if the focus was in the src win, put it in the asm win, if the
** source view isn't split
*/
if (tui_current_layout () != SRC_DISASSEM_COMMAND && win_with_focus == TUI_SRC_WIN)
tui_set_win_focus_to (TUI_DISASM_WIN);
return;
}
/* Function to display the disassembly window. */
void
tui_show_disassem_and_update_source (CORE_ADDR start_addr)
{
struct symtab_and_line sal;
tui_show_disassem (start_addr);
if (tui_current_layout () == SRC_DISASSEM_COMMAND)
{
union tui_line_or_address val;
/*
** Update what is in the source window if it is displayed too,
** note that it follows what is in the disassembly window and visa-versa
*/
sal = find_pc_line (start_addr, 0);
val.line_no = sal.line;
tui_update_source_window (TUI_SRC_WIN, sal.symtab, val, TRUE);
if (sal.symtab)
{
set_current_source_symtab_and_line (&sal);
tui_update_locator_filename (sal.symtab->filename);
}
else
tui_update_locator_filename ("?");
}
return;
}
CORE_ADDR
tui_get_begin_asm_address (void)
{
struct tui_gen_win_info * locator;
struct tui_locator_element * element;
CORE_ADDR addr;
locator = tui_locator_win_info_ptr ();
element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
if (element->addr == 0)
{
struct minimal_symbol *main_symbol;
/* Find address of the start of program.
Note: this should be language specific. */
main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
if (main_symbol == 0)
main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
if (main_symbol == 0)
main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
if (main_symbol)
addr = SYMBOL_VALUE_ADDRESS (main_symbol);
else
addr = 0;
}
else /* the target is executing */
addr = element->addr;
return addr;
}
/* Determine what the low address will be to display in the TUI's
disassembly window. This may or may not be the same as the
low address input. */
CORE_ADDR
tui_get_low_disassembly_address (CORE_ADDR low, CORE_ADDR pc)
{
int pos;
/* Determine where to start the disassembly so that the pc is about in the
middle of the viewport. */
pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
pc = tui_find_disassembly_address (pc, -pos);
if (pc < low)
pc = low;
return pc;
}
/* Scroll the disassembly forward or backward vertically. */
void
tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,
int num_to_scroll)
{
if (TUI_DISASM_WIN->generic.content != NULL)
{
CORE_ADDR pc;
tui_win_content content;
struct symtab *s;
union tui_line_or_address val;
int max_lines, dir;
struct symtab_and_line cursal = get_current_source_symtab_and_line ();
content = (tui_win_content) TUI_DISASM_WIN->generic.content;
if (cursal.symtab == (struct symtab *) NULL)
s = find_pc_symtab (get_frame_pc (deprecated_selected_frame));
else
s = cursal.symtab;
/* account for hilite */
max_lines = TUI_DISASM_WIN->generic.height - 2;
pc = content[0]->which_element.source.line_or_addr.addr;
dir = (scroll_direction == FORWARD_SCROLL) ? max_lines : - max_lines;
val.addr = tui_find_disassembly_address (pc, dir);
tui_update_source_window_as_is (TUI_DISASM_WIN, s, val, FALSE);
}
}
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