diff options
Diffstat (limited to 'gdb/stuff.c')
| -rw-r--r-- | gdb/stuff.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/gdb/stuff.c b/gdb/stuff.c new file mode 100644 index 0000000..0f0a503 --- /dev/null +++ b/gdb/stuff.c @@ -0,0 +1,168 @@ +/* Program to stuff files into a specially prepared space in kdb. + Copyright (C) 1986 Free Software Foundation, Inc. + +GDB is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY. No author or distributor accepts responsibility to anyone +for the consequences of using it or for whether it serves any +particular purpose or works at all, unless he says so in writing. +Refer to the GDB General Public License for full details. + +Everyone is granted permission to copy, modify and redistribute GDB, +but only under the conditions described in the GDB General Public +License. A copy of this license is supposed to have been given to you +along with GDB so you can know your rights and responsibilities. It +should be in a file named COPYING. Among other things, the copyright +notice and this notice must be preserved on all copies. + +In other words, go ahead and share GDB, but don't try to stop +anyone else from sharing it farther. Help stamp out software hoarding! +*/ + +/* Written 13-Mar-86 by David Bridgham. */ + +#include <stdio.h> +#include <a.out.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/file.h> + +extern char *sys_errlist[]; +extern int errno; + +main (argc, argv) + int argc; + char *argv[]; +{ + register char *cp; + char *outfile; + register int i; + int offset; + int out_fd, in_fd; + struct stat stat_buf; + int size, pad; + char buf[1024]; + static char zeros[4] = {0}; + + if (argc < 4) + err("Not enough arguments\nUsage: %s -o kdb file1 file2 ...\n", + argv[0]); + + outfile = 0; + for (i = 1; i < argc; i++) + { + if (strcmp (argv[i], "-o") == 0) + outfile = argv[++i]; + } + if (outfile == 0) + err("Output file not specified\n"); + + offset = get_offset (outfile, "_heap"); + + out_fd = open (outfile, O_WRONLY); + if (out_fd < 0) + err ("Error opening %s for write: %s\n", outfile, sys_errlist[errno]); + if (lseek (out_fd, offset, 0) < 0) + err ("Error seeking to heap in %s: %s\n", outfile, sys_errlist[errno]); + + /* For each file listed on the command line, write it into the + * 'heap' of the output file. Make sure to skip the arguments + * that name the output file. */ + for (i = 1; i < argc; i++) + { + if (strcmp (argv[i], "-o") == 0) + continue; + if ((in_fd = open (argv[i], O_RDONLY)) < 0) + err ("Error opening %s for read: %s\n", argv[i], sys_errlist[errno]); + if (fstat (in_fd, &stat_buf) < 0) + err ("Error stat'ing %s: %s\n", argv[i], sys_errlist[errno]); + size = strlen (argv[i]); + pad = 4 - (size & 3); + size += pad + stat_buf.st_size + sizeof (int); + write (out_fd, &size, sizeof (int)); + write (out_fd, argv[i], strlen (argv[i])); + write (out_fd, zeros, pad); + while ((size = read (in_fd, buf, sizeof (buf))) > 0) + write (out_fd, buf, size); + close (in_fd); + } + size = 0; + write (out_fd, &size, sizeof (int)); + close (out_fd); + return (0); +} + +/* Read symbol table from file and returns the offset into the file + * where symbol sym_name is located. If error, print message and + * exit. */ +get_offset (file, sym_name) + char *file; + char *sym_name; +{ + int f; + struct exec file_hdr; + struct nlist *symbol_table; + int size; + char *strings; + + f = open (file, O_RDONLY); + if (f < 0) + err ("Error opening %s: %s\n", file, sys_errlist[errno]); + if (read (f, &file_hdr, sizeof (file_hdr)) < 0) + err ("Error reading exec structure: %s\n", sys_errlist[errno]); + if (N_BADMAG (file_hdr)) + err ("File %s not an a.out file\n", file); + + /* read in symbol table */ + if ((symbol_table = (struct nlist *)malloc (file_hdr.a_syms)) == 0) + err ("Couldn't allocate space for symbol table\n"); + if (lseek (f, N_SYMOFF (file_hdr), 0) == -1) + err ("lseek error: %s\n", sys_errlist[errno]); + if (read (f, symbol_table, file_hdr.a_syms) == -1) + err ("Error reading symbol table from %s: %s\n", file, sys_errlist[errno]); + + /* read in string table */ + if (read (f, &size, 4) == -1) + err ("reading string table size: %s\n", sys_errlist[errno]); + if ((strings = (char *)malloc (size)) == 0) + err ("Couldn't allocate memory for string table\n"); + if (read (f, strings, size - 4) == -1) + err ("reading string table: %s\n", sys_errlist[errno]); + + /* Find the core address at which the first byte of kdb text segment + should be loaded into core when kdb is run. */ + origin = find_symbol ("_etext", symbol_table, file_hdr.a_syms, strings) + - file_hdr.a_text; + /* Find the core address at which the heap will appear. */ + coreaddr = find_symbol (sym_name, symbol_table, file_hdr.a_syms, strings); + /* Return address in file of the heap data space. */ + return (N_TXTOFF (file_hdr) + core_addr - origin); +} + +find_symbol (sym_name, symbol_table, length, strings) + char *sym_name; + struct nlist *symbol_table; + int length; + char *strings; +{ + register struct nlist *sym; + + /* Find symbol in question */ + for (sym = symbol_table; + sym != (struct nlist *)((char *)symbol_table + length); + sym++) + { + if ((sym->n_type & N_TYPE) != N_DATA) continue; + if (sym->n_un.n_strx == 0) continue; + if (strcmp (sym_name, strings + sym->n_un.n_strx - 4) == 0) + return sym->n_value; + } + err ("Data symbol %s not found in %s\n", sym_name, file); +} + +err (msg, a1, a2, a3) + char *msg; + int a1, a2, a3; +{ + fprintf (stderr, msg, a1, a2, a3); + exit (-1); +} |