459 lines
13 KiB
C
459 lines
13 KiB
C
/* Work with executable files, for GDB.
|
||
Copyright 1988, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "frame.h"
|
||
#include "inferior.h"
|
||
#include "target.h"
|
||
#include "gdbcmd.h"
|
||
|
||
#ifdef USG
|
||
#include <sys/types.h>
|
||
#endif
|
||
|
||
#include <sys/param.h>
|
||
#include <fcntl.h>
|
||
#include <string.h>
|
||
|
||
#include "gdbcore.h"
|
||
|
||
#include <ctype.h>
|
||
#include <sys/stat.h>
|
||
#ifndef O_BINARY
|
||
#define O_BINARY 0
|
||
#endif
|
||
|
||
/* Prototypes for local functions */
|
||
|
||
static void
|
||
add_to_section_table PARAMS ((bfd *, sec_ptr, PTR));
|
||
|
||
static void
|
||
exec_close PARAMS ((int));
|
||
|
||
static void
|
||
file_command PARAMS ((char *, int));
|
||
|
||
static void
|
||
set_section_command PARAMS ((char *, int));
|
||
|
||
static void
|
||
exec_files_info PARAMS ((struct target_ops *));
|
||
|
||
extern int info_verbose;
|
||
|
||
/* The Binary File Descriptor handle for the executable file. */
|
||
|
||
bfd *exec_bfd = NULL;
|
||
|
||
/* Whether to open exec and core files read-only or read-write. */
|
||
|
||
int write_files = 0;
|
||
|
||
/* Text start and end addresses (KLUDGE) if needed */
|
||
|
||
#ifdef NEED_TEXT_START_END
|
||
CORE_ADDR text_start = 0;
|
||
CORE_ADDR text_end = 0;
|
||
#endif
|
||
|
||
/* Forward decl */
|
||
|
||
extern struct target_ops exec_ops;
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
exec_close (quitting)
|
||
int quitting;
|
||
{
|
||
if (exec_bfd) {
|
||
bfd_close (exec_bfd);
|
||
exec_bfd = NULL;
|
||
}
|
||
if (exec_ops.to_sections) {
|
||
free ((PTR)exec_ops.to_sections);
|
||
exec_ops.to_sections = NULL;
|
||
exec_ops.to_sections_end = NULL;
|
||
}
|
||
}
|
||
|
||
/* Process the first arg in ARGS as the new exec file.
|
||
|
||
Note that we have to explicitly ignore additional args, since we can
|
||
be called from file_command(), which also calls symbol_file_command()
|
||
which can take multiple args. */
|
||
|
||
void
|
||
exec_file_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char **argv;
|
||
char *filename;
|
||
|
||
target_preopen (from_tty);
|
||
|
||
/* Remove any previous exec file. */
|
||
unpush_target (&exec_ops);
|
||
|
||
/* Now open and digest the file the user requested, if any. */
|
||
|
||
if (args)
|
||
{
|
||
char *scratch_pathname;
|
||
int scratch_chan;
|
||
|
||
/* Scan through the args and pick up the first non option arg
|
||
as the filename. */
|
||
|
||
if ((argv = buildargv (args)) == NULL)
|
||
{
|
||
nomem (0);
|
||
}
|
||
make_cleanup (freeargv, (char *) argv);
|
||
|
||
for (; (*argv != NULL) && (**argv == '-'); argv++) {;}
|
||
if (*argv == NULL)
|
||
{
|
||
error ("no exec file name was specified");
|
||
}
|
||
|
||
filename = tilde_expand (*argv);
|
||
make_cleanup (free, filename);
|
||
|
||
scratch_chan = openp (getenv ("PATH"), 1, filename,
|
||
write_files? O_RDWR|O_BINARY: O_RDONLY|O_BINARY, 0,
|
||
&scratch_pathname);
|
||
if (scratch_chan < 0)
|
||
perror_with_name (filename);
|
||
|
||
exec_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
|
||
if (!exec_bfd)
|
||
error ("Could not open `%s' as an executable file: %s",
|
||
scratch_pathname, bfd_errmsg (bfd_error));
|
||
if (!bfd_check_format (exec_bfd, bfd_object))
|
||
error ("\"%s\": not in executable format: %s.",
|
||
scratch_pathname, bfd_errmsg (bfd_error));
|
||
|
||
if (build_section_table (exec_bfd, &exec_ops.to_sections,
|
||
&exec_ops.to_sections_end))
|
||
error ("Can't find the file sections in `%s': %s",
|
||
exec_bfd->filename, bfd_errmsg (bfd_error));
|
||
|
||
#ifdef NEED_TEXT_START_END
|
||
/* This is a KLUDGE (FIXME) because a few places in a few ports
|
||
(29K springs to mind) need this info for now. */
|
||
{
|
||
struct section_table *p;
|
||
for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
|
||
if (!strcmp (".text", bfd_section_name (p->bfd, p->sec_ptr)))
|
||
{
|
||
text_start = p->addr;
|
||
text_end = p->endaddr;
|
||
break;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
validate_files ();
|
||
|
||
push_target (&exec_ops);
|
||
|
||
/* Tell display code (if any) about the changed file name. */
|
||
if (exec_file_display_hook)
|
||
(*exec_file_display_hook) (filename);
|
||
}
|
||
else if (from_tty)
|
||
printf_filtered ("No exec file now.\n");
|
||
}
|
||
|
||
/* Set both the exec file and the symbol file, in one command.
|
||
What a novelty. Why did GDB go through four major releases before this
|
||
command was added? */
|
||
|
||
static void
|
||
file_command (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
/* FIXME, if we lose on reading the symbol file, we should revert
|
||
the exec file, but that's rough. */
|
||
exec_file_command (arg, from_tty);
|
||
symbol_file_command (arg, from_tty);
|
||
}
|
||
|
||
|
||
/* Locate all mappable sections of a BFD file.
|
||
table_pp_char is a char * to get it through bfd_map_over_sections;
|
||
we cast it back to its proper type. */
|
||
|
||
static void
|
||
add_to_section_table (abfd, asect, table_pp_char)
|
||
bfd *abfd;
|
||
sec_ptr asect;
|
||
PTR table_pp_char;
|
||
{
|
||
struct section_table **table_pp = (struct section_table **)table_pp_char;
|
||
flagword aflag;
|
||
|
||
aflag = bfd_get_section_flags (abfd, asect);
|
||
/* FIXME, we need to handle BSS segment here...it alloc's but doesn't load */
|
||
if (!(aflag & SEC_LOAD))
|
||
return;
|
||
if (0 == bfd_section_size (abfd, asect))
|
||
return;
|
||
(*table_pp)->bfd = abfd;
|
||
(*table_pp)->sec_ptr = asect;
|
||
(*table_pp)->addr = bfd_section_vma (abfd, asect);
|
||
(*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
|
||
(*table_pp)++;
|
||
}
|
||
|
||
/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
|
||
Returns 0 if OK, 1 on error. */
|
||
|
||
int
|
||
build_section_table (some_bfd, start, end)
|
||
bfd *some_bfd;
|
||
struct section_table **start, **end;
|
||
{
|
||
unsigned count;
|
||
|
||
count = bfd_count_sections (some_bfd);
|
||
if (*start)
|
||
free ((PTR)*start);
|
||
*start = (struct section_table *) xmalloc (count * sizeof (**start));
|
||
*end = *start;
|
||
bfd_map_over_sections (some_bfd, add_to_section_table, (char *)end);
|
||
if (*end > *start + count)
|
||
abort();
|
||
/* We could realloc the table, but it probably loses for most files. */
|
||
return 0;
|
||
}
|
||
|
||
/* Read or write the exec file.
|
||
|
||
Args are address within a BFD file, address within gdb address-space,
|
||
length, and a flag indicating whether to read or write.
|
||
|
||
Result is a length:
|
||
|
||
0: We cannot handle this address and length.
|
||
> 0: We have handled N bytes starting at this address.
|
||
(If N == length, we did it all.) We might be able
|
||
to handle more bytes beyond this length, but no
|
||
promises.
|
||
< 0: We cannot handle this address, but if somebody
|
||
else handles (-N) bytes, we can start from there.
|
||
|
||
The same routine is used to handle both core and exec files;
|
||
we just tail-call it with more arguments to select between them. */
|
||
|
||
int
|
||
xfer_memory (memaddr, myaddr, len, write, target)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int write;
|
||
struct target_ops *target;
|
||
{
|
||
boolean res;
|
||
struct section_table *p;
|
||
CORE_ADDR nextsectaddr, memend;
|
||
boolean (*xfer_fn) PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type));
|
||
|
||
if (len <= 0)
|
||
abort();
|
||
|
||
memend = memaddr + len;
|
||
xfer_fn = write? bfd_set_section_contents: bfd_get_section_contents;
|
||
nextsectaddr = memend;
|
||
|
||
for (p = target->to_sections; p < target->to_sections_end; p++)
|
||
{
|
||
if (p->addr <= memaddr)
|
||
if (p->endaddr >= memend)
|
||
{
|
||
/* Entire transfer is within this section. */
|
||
res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len);
|
||
return (res != false)? len: 0;
|
||
}
|
||
else if (p->endaddr <= memaddr)
|
||
{
|
||
/* This section ends before the transfer starts. */
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
/* This section overlaps the transfer. Just do half. */
|
||
len = p->endaddr - memaddr;
|
||
res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len);
|
||
return (res != false)? len: 0;
|
||
}
|
||
else if (p->addr < nextsectaddr)
|
||
nextsectaddr = p->addr;
|
||
}
|
||
|
||
if (nextsectaddr >= memend)
|
||
return 0; /* We can't help */
|
||
else
|
||
return - (nextsectaddr - memaddr); /* Next boundary where we can help */
|
||
}
|
||
|
||
#ifdef FIXME
|
||
#ifdef REG_STACK_SEGMENT
|
||
/* MOVE TO BFD... */
|
||
/* Pyramids and AM29000s have an extra segment in the virtual address space
|
||
for the (control) stack of register-window frames. The AM29000 folk
|
||
call it the "register stack" rather than the "memory stack". */
|
||
else if (memaddr >= reg_stack_start && memaddr < reg_stack_end)
|
||
{
|
||
i = min (len, reg_stack_end - memaddr);
|
||
fileptr = memaddr - reg_stack_start + reg_stack_offset;
|
||
wanna_xfer = coredata;
|
||
}
|
||
#endif /* REG_STACK_SEGMENT */
|
||
#endif FIXME
|
||
|
||
void
|
||
print_section_info (t, abfd)
|
||
struct target_ops *t;
|
||
bfd *abfd;
|
||
{
|
||
struct section_table *p;
|
||
|
||
printf_filtered ("\t`%s', ", bfd_get_filename(abfd));
|
||
wrap_here (" ");
|
||
printf_filtered ("file type %s.\n", bfd_get_target(abfd));
|
||
|
||
for (p = t->to_sections; p < t->to_sections_end; p++) {
|
||
printf_filtered ("\t%s", local_hex_string_custom (p->addr, "08"));
|
||
printf_filtered (" - %s", local_hex_string_custom (p->endaddr, "08"));
|
||
if (info_verbose)
|
||
printf_filtered (" @ %s",
|
||
local_hex_string_custom (p->sec_ptr->filepos, "08"));
|
||
printf_filtered (" is %s", bfd_section_name (p->bfd, p->sec_ptr));
|
||
if (p->bfd != abfd) {
|
||
printf_filtered (" in %s", bfd_get_filename (p->bfd));
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
exec_files_info (t)
|
||
struct target_ops *t;
|
||
{
|
||
print_section_info (t, exec_bfd);
|
||
}
|
||
|
||
static void
|
||
set_section_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
struct section_table *p;
|
||
char *secname;
|
||
unsigned seclen;
|
||
unsigned long secaddr;
|
||
char secprint[100];
|
||
long offset;
|
||
|
||
if (args == 0)
|
||
error ("Must specify section name and its virtual address");
|
||
|
||
/* Parse out section name */
|
||
for (secname = args; !isspace(*args); args++) ;
|
||
seclen = args - secname;
|
||
|
||
/* Parse out new virtual address */
|
||
secaddr = parse_and_eval_address (args);
|
||
|
||
for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++) {
|
||
if (!strncmp (secname, bfd_section_name (exec_bfd, p->sec_ptr), seclen)
|
||
&& bfd_section_name (exec_bfd, p->sec_ptr)[seclen] == '\0') {
|
||
offset = secaddr - p->addr;
|
||
p->addr += offset;
|
||
p->endaddr += offset;
|
||
if (from_tty)
|
||
exec_files_info(&exec_ops);
|
||
return;
|
||
}
|
||
}
|
||
if (seclen >= sizeof (secprint))
|
||
seclen = sizeof (secprint) - 1;
|
||
strncpy (secprint, secname, seclen);
|
||
secprint[seclen] = '\0';
|
||
error ("Section %s not found", secprint);
|
||
}
|
||
|
||
struct target_ops exec_ops = {
|
||
"exec", "Local exec file",
|
||
"Use an executable file as a target.\n\
|
||
Specify the filename of the executable file.",
|
||
exec_file_command, exec_close, /* open, close */
|
||
child_attach, 0, 0, 0, /* attach, detach, resume, wait, */
|
||
0, 0, /* fetch_registers, store_registers, */
|
||
0, /* prepare_to_store, */
|
||
xfer_memory, exec_files_info,
|
||
0, 0, /* insert_breakpoint, remove_breakpoint, */
|
||
0, 0, 0, 0, 0, /* terminal stuff */
|
||
0, 0, /* kill, load */
|
||
0, /* lookup sym */
|
||
child_create_inferior,
|
||
0, /* mourn_inferior */
|
||
file_stratum, 0, /* next */
|
||
0, 1, 0, 0, 0, /* all mem, mem, stack, regs, exec */
|
||
0, 0, /* section pointers */
|
||
OPS_MAGIC, /* Always the last thing */
|
||
};
|
||
|
||
void
|
||
_initialize_exec()
|
||
{
|
||
|
||
add_com ("file", class_files, file_command,
|
||
"Use FILE as program to be debugged.\n\
|
||
It is read for its symbols, for getting the contents of pure memory,\n\
|
||
and it is the program executed when you use the `run' command.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
($PATH) is searched for a command of that name.\n\
|
||
No arg means to have no executable file and no symbols.");
|
||
|
||
add_com ("exec-file", class_files, exec_file_command,
|
||
"Use FILE as program for getting contents of pure memory.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
is searched for a command of that name.\n\
|
||
No arg means have no executable file.");
|
||
|
||
add_com ("section", class_files, set_section_command,
|
||
"Change the base address of section SECTION of the exec file to ADDR.\n\
|
||
This can be used if the exec file does not contain section addresses,\n\
|
||
(such as in the a.out format), or when the addresses specified in the\n\
|
||
file itself are wrong. Each section must be changed separately. The\n\
|
||
``info files'' command lists all the sections and their addresses.");
|
||
|
||
add_show_from_set
|
||
(add_set_cmd ("write", class_support, var_boolean, (char *)&write_files,
|
||
"Set writing into executable and core files.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_target (&exec_ops);
|
||
}
|