407 lines
11 KiB
C
407 lines
11 KiB
C
/* Copyright (C) 1988, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GDB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "param.h"
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#include "frame.h"
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#include "inferior.h"
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#include "arm-opcode.h"
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#include <stdio.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#define N_TXTADDR(hdr) 0x8000
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#define N_DATADDR(hdr) (hdr.a_text + 0x8000)
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#include "gdbcore.h"
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#include <sys/user.h> /* After a.out.h */
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <errno.h>
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/* Work with core dump and executable files, for GDB.
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This code would be in core.c if it weren't machine-dependent. */
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/* Structure to describe the chain of shared libraries used
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by the execfile.
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e.g. prog shares Xt which shares X11 which shares c. */
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struct shared_library {
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struct exec_header header;
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char name[SHLIBLEN];
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CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */
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long data_offset; /* offset of data section in file */
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int chan; /* file descriptor for the file */
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struct shared_library *shares; /* library this one shares */
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};
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static struct shared_library *shlib = 0;
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/* Hook for `exec_file_command' command to call. */
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extern void (*exec_file_display_hook) ();
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static CORE_ADDR unshared_text_start;
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/* extended header from exec file (for shared library info) */
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static struct exec_header exec_header;
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void
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exec_file_command (filename, from_tty)
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char *filename;
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int from_tty;
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{
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int val;
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/* Eliminate all traces of old exec file.
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Mark text segment as empty. */
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if (execfile)
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free (execfile);
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execfile = 0;
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data_start = 0;
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data_end -= exec_data_start;
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text_start = 0;
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unshared_text_start = 0;
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text_end = 0;
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exec_data_start = 0;
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exec_data_end = 0;
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if (execchan >= 0)
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close (execchan);
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execchan = -1;
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if (shlib) {
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close_shared_library(shlib);
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shlib = 0;
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}
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/* Now open and digest the file the user requested, if any. */
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if (filename)
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{
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filename = tilde_expand (filename);
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make_cleanup (free, filename);
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execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
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&execfile);
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if (execchan < 0)
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perror_with_name (filename);
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{
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struct stat st_exec;
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#ifdef HEADER_SEEK_FD
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HEADER_SEEK_FD (execchan);
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#endif
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val = myread (execchan, &exec_header, sizeof exec_header);
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exec_aouthdr = exec_header.a_exec;
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if (val < 0)
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perror_with_name (filename);
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text_start = 0x8000;
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/* Look for shared library if needed */
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if (exec_header.a_exec.a_magic & MF_USES_SL)
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shlib = open_shared_library(exec_header.a_shlibname, text_start);
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text_offset = N_TXTOFF (exec_aouthdr);
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exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
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if (shlib) {
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unshared_text_start = shared_text_end(shlib) & ~0x7fff;
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stack_start = shlib->header.a_exec.a_sldatabase;
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stack_end = STACK_END_ADDR;
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} else
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unshared_text_start = 0x8000;
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text_end = unshared_text_start + exec_aouthdr.a_text;
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exec_data_start = unshared_text_start + exec_aouthdr.a_text;
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exec_data_end = exec_data_start + exec_aouthdr.a_data;
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data_start = exec_data_start;
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data_end += exec_data_start;
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fstat (execchan, &st_exec);
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exec_mtime = st_exec.st_mtime;
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}
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validate_files ();
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}
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else if (from_tty)
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printf ("No exec file now.\n");
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/* Tell display code (if any) about the changed file name. */
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if (exec_file_display_hook)
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(*exec_file_display_hook) (filename);
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}
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/* Read from the program's memory (except for inferior processes).
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This function is misnamed, since it only reads, never writes; and
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since it will use the core file and/or executable file as necessary.
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It should be extended to write as well as read, FIXME, for patching files.
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Return 0 if address could be read, EIO if addresss out of bounds. */
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int
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xfer_core_file (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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{
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register int i;
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register int val;
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int xferchan;
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char **xferfile;
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int fileptr;
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int returnval = 0;
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while (len > 0)
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{
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xferfile = 0;
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xferchan = 0;
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/* Determine which file the next bunch of addresses reside in,
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and where in the file. Set the file's read/write pointer
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to point at the proper place for the desired address
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and set xferfile and xferchan for the correct file.
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If desired address is nonexistent, leave them zero.
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i is set to the number of bytes that can be handled
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along with the next address.
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We put the most likely tests first for efficiency. */
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/* Note that if there is no core file
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data_start and data_end are equal. */
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if (memaddr >= data_start && memaddr < data_end)
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{
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i = min (len, data_end - memaddr);
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fileptr = memaddr - data_start + data_offset;
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xferfile = &corefile;
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xferchan = corechan;
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}
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/* Note that if there is no core file
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stack_start and stack_end define the shared library data. */
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else if (memaddr >= stack_start && memaddr < stack_end)
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{
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if (corechan < 0) {
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struct shared_library *lib;
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for (lib = shlib; lib; lib = lib->shares)
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if (memaddr >= lib->header.a_exec.a_sldatabase &&
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memaddr < lib->header.a_exec.a_sldatabase +
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lib->header.a_exec.a_data)
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break;
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if (lib) {
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i = min (len, lib->header.a_exec.a_sldatabase +
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lib->header.a_exec.a_data - memaddr);
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fileptr = lib->data_offset + memaddr -
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lib->header.a_exec.a_sldatabase;
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xferfile = execfile;
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xferchan = lib->chan;
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}
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} else {
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i = min (len, stack_end - memaddr);
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fileptr = memaddr - stack_start + stack_offset;
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xferfile = &corefile;
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xferchan = corechan;
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}
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}
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else if (corechan < 0
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&& memaddr >= exec_data_start && memaddr < exec_data_end)
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{
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i = min (len, exec_data_end - memaddr);
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fileptr = memaddr - exec_data_start + exec_data_offset;
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xferfile = &execfile;
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xferchan = execchan;
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}
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else if (memaddr >= text_start && memaddr < text_end)
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{
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struct shared_library *lib;
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for (lib = shlib; lib; lib = lib->shares)
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if (memaddr >= lib->text_start &&
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memaddr < lib->text_start + lib->header.a_exec.a_text)
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break;
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if (lib) {
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i = min (len, lib->header.a_exec.a_text +
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lib->text_start - memaddr);
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fileptr = memaddr - lib->text_start + text_offset;
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xferfile = &execfile;
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xferchan = lib->chan;
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} else {
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i = min (len, text_end - memaddr);
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fileptr = memaddr - unshared_text_start + text_offset;
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xferfile = &execfile;
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xferchan = execchan;
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}
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}
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else if (memaddr < text_start)
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{
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i = min (len, text_start - memaddr);
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}
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else if (memaddr >= text_end
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&& memaddr < (corechan >= 0? data_start : exec_data_start))
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{
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i = min (len, data_start - memaddr);
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}
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else if (corechan >= 0
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&& memaddr >= data_end && memaddr < stack_start)
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{
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i = min (len, stack_start - memaddr);
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}
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else if (corechan < 0 && memaddr >= exec_data_end)
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{
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i = min (len, - memaddr);
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}
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else if (memaddr >= stack_end && stack_end != 0)
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{
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i = min (len, - memaddr);
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}
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else
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{
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/* Address did not classify into one of the known ranges.
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This shouldn't happen; we catch the endpoints. */
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fatal ("Internal: Bad case logic in xfer_core_file.");
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}
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/* Now we know which file to use.
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Set up its pointer and transfer the data. */
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if (xferfile)
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{
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if (*xferfile == 0)
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if (xferfile == &execfile)
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error ("No program file to examine.");
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else
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error ("No core dump file or running program to examine.");
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val = lseek (xferchan, fileptr, 0);
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if (val < 0)
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perror_with_name (*xferfile);
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val = myread (xferchan, myaddr, i);
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if (val < 0)
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perror_with_name (*xferfile);
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}
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/* If this address is for nonexistent memory,
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read zeros if reading, or do nothing if writing.
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Actually, we never right. */
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else
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{
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bzero (myaddr, i);
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returnval = EIO;
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}
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memaddr += i;
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myaddr += i;
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len -= i;
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}
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return returnval;
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}
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/* APCS (ARM procedure call standard) defines the following prologue:
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mov ip, sp
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[stmfd sp!, {a1,a2,a3,a4}]
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stmfd sp!, {...,fp,ip,lr,pc}
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[stfe f7, [sp, #-12]!]
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[stfe f6, [sp, #-12]!]
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[stfe f5, [sp, #-12]!]
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[stfe f4, [sp, #-12]!]
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sub fp, ip, #nn // nn == 20 or 4 depending on second ins
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*/
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CORE_ADDR
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skip_prologue(pc)
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CORE_ADDR pc;
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{
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union insn_fmt op;
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CORE_ADDR skip_pc = pc;
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op.ins = read_memory_integer(skip_pc, 4);
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/* look for the "mov ip,sp" */
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if (op.generic.type != TYPE_ARITHMETIC ||
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op.arith.opcode != OPCODE_MOV ||
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op.arith.dest != SPTEMP ||
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op.arith.operand2 != SP) return pc;
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skip_pc += 4;
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/* skip the "stmfd sp!,{a1,a2,a3,a4}" if its there */
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op.ins = read_memory_integer(skip_pc, 4);
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if (op.generic.type == TYPE_BLOCK_BRANCH &&
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op.generic.subtype == SUBTYPE_BLOCK &&
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op.block.mask == 0xf &&
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op.block.base == SP &&
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op.block.is_load == 0 &&
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op.block.writeback == 1 &&
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op.block.increment == 0 &&
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op.block.before == 1) skip_pc += 4;
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/* skip the "stmfd sp!,{...,fp,ip,lr,pc} */
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op.ins = read_memory_integer(skip_pc, 4);
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if (op.generic.type != TYPE_BLOCK_BRANCH ||
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op.generic.subtype != SUBTYPE_BLOCK ||
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/* the mask should look like 110110xxxxxx0000 */
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(op.block.mask & 0xd800) != 0xd800 ||
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op.block.base != SP ||
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op.block.is_load != 0 ||
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op.block.writeback != 1 ||
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op.block.increment != 0 ||
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op.block.before != 1) return pc;
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skip_pc += 4;
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/* check for "sub fp,ip,#nn" */
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op.ins = read_memory_integer(skip_pc, 4);
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if (op.generic.type != TYPE_ARITHMETIC ||
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op.arith.opcode != OPCODE_SUB ||
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op.arith.dest != FP ||
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op.arith.operand1 != SPTEMP) return pc;
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return skip_pc + 4;
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}
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static void
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print_fpu_flags(flags)
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int flags;
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{
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if (flags & (1 << 0)) fputs("IVO ", stdout);
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if (flags & (1 << 1)) fputs("DVZ ", stdout);
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if (flags & (1 << 2)) fputs("OFL ", stdout);
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if (flags & (1 << 3)) fputs("UFL ", stdout);
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if (flags & (1 << 4)) fputs("INX ", stdout);
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putchar('\n');
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}
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void
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arm_float_info()
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{
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register unsigned long status = read_register(FPS_REGNUM);
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int type;
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type = (status >> 24) & 127;
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printf("%s FPU type %d\n",
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(status & (1<<31)) ? "Hardware" : "Software",
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type);
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fputs("mask: ", stdout);
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print_fpu_flags(status >> 16);
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fputs("flags: ", stdout);
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print_fpu_flags(status);
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}
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