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-rw-r--r--gnu/usr.bin/gdb/gdb/exec.c489
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diff --git a/gnu/usr.bin/gdb/gdb/exec.c b/gnu/usr.bin/gdb/gdb/exec.c
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+++ b/gnu/usr.bin/gdb/gdb/exec.c
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+/* 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) {
+ char *name = bfd_get_filename (exec_bfd);
+ bfd_close (exec_bfd);
+ free (name);
+ 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, gnutarget, 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
+
+ /* text_end is sometimes used for where to put call dummies. A
+ few ports use these for other purposes too. */
+
+ {
+ struct section_table *p;
+
+ /* Set text_start to the lowest address of the start of any
+ readonly code section and set text_end to the highest
+ address of the end of any readonly code section. */
+
+ text_start = ~(CORE_ADDR)0;
+ text_end = (CORE_ADDR)0;
+ for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
+ if (bfd_get_section_flags (p->bfd, p->sec_ptr)
+ & (SEC_CODE | SEC_READONLY))
+ {
+ if (text_start > p->addr)
+ text_start = p->addr;
+ if (text_end < p->endaddr)
+ text_end = p->endaddr;
+ }
+ }
+#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 ("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));
+ printf_filtered ("\tEntry point: %s\n",
+ local_hex_string ((unsigned long) bfd_get_start_address (exec_bfd)));
+ for (p = t->to_sections; p < t->to_sections_end; p++) {
+ printf_filtered ("\t%s", local_hex_string_custom ((unsigned long) p->addr, "08l"));
+ printf_filtered (" - %s", local_hex_string_custom ((unsigned long) p->endaddr, "08l"));
+ if (info_verbose)
+ printf_filtered (" @ %s",
+ local_hex_string_custom ((unsigned long) p->sec_ptr->filepos, "08l"));
+ 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);
+}
+
+/* If mourn is being called in all the right places, this could be say
+ `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
+
+static int
+ignore (addr, contents)
+ CORE_ADDR addr;
+ char *contents;
+{
+ return 0;
+}
+
+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 */
+ find_default_attach, 0, 0, 0, /* attach, detach, resume, wait, */
+ 0, 0, /* fetch_registers, store_registers, */
+ 0, /* prepare_to_store, */
+ xfer_memory, exec_files_info,
+ ignore, ignore, /* insert_breakpoint, remove_breakpoint, */
+ 0, 0, 0, 0, 0, /* terminal stuff */
+ 0, 0, /* kill, load */
+ 0, /* lookup sym */
+ find_default_create_inferior,
+ 0, /* mourn_inferior */
+ 0, /* can_run */
+ 0, /* notice_signals */
+ 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()
+{
+ struct cmd_list_element *c;
+
+ c = add_cmd ("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.", &cmdlist);
+ c->completer = filename_completer;
+
+ c = add_cmd ("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.", &cmdlist);
+ c->completer = filename_completer;
+
+ 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);
+}
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