+++ /dev/null
-/* Interface to bare machine for GDB running as kernel debugger.
-
- Copyright 1986, 1989, 1991, 1992, 1993, 1995, 1996, 2000, 2001,
- 2003 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#include <stdio.h>
-#include <sys/ioctl.h>
-#include <errno.h>
-#include <sys/types.h>
-#include "gdb_stat.h"
-
-#if defined (SIGTSTP) && defined (SIGIO)
-#include <sys/time.h>
-#include <sys/resource.h>
-#endif /* SIGTSTP and SIGIO defined (must be 4.2) */
-
-#include "defs.h"
-#include <signal.h>
-#include "symtab.h"
-#include "frame.h"
-#include "inferior.h"
-#include "gdb_wait.h"
-\f
-
-/* Random system calls, mostly no-ops to prevent link problems */
-
-ioctl (int desc, int code, int arg)
-{
-}
-
-int (*signal ()) ()
-{
-}
-
-kill (void)
-{
-}
-
-getpid (void)
-{
- return 0;
-}
-
-sigsetmask (void)
-{
-}
-
-chdir (void)
-{
-}
-
-char *
-getcwd (char *buf, unsigned int len)
-{
- buf[0] = '/';
- buf[1] = 0;
- return buf;
-}
-
-/* Used to check for existence of .gdbinit. Say no. */
-
-access (void)
-{
- return -1;
-}
-
-exit (void)
-{
- error ("Fatal error; restarting.");
-}
-\f
-/* Reading "files". The contents of some files are written into kdb's
- data area before it is run. These files are used to contain the
- symbol table for kdb to load, and the source files (in case the
- kdb user wants to print them). The symbols are stored in a file
- named "kdb-symbols" in a.out format (except that all the text and
- data have been stripped to save room).
-
- The files are stored in the following format:
- int number of bytes of data for this file, including these four.
- char[] name of the file, ending with a null.
- padding to multiple of 4 boundary.
- char[] file contents. The length can be deduced from what was
- specified before. There is no terminating null here.
-
- If the int at the front is zero, it means there are no more files.
-
- Opening a file in kdb returns a nonzero value to indicate success,
- but the value does not matter. Only one file can be open, and only
- for reading. All the primitives for input from the file know
- which file is open and ignore what is specified for the descriptor
- or for the stdio stream.
-
- Input with fgetc can be done either on the file that is open
- or on stdin (which reads from the terminal through tty_input () */
-
-/* Address of data for the files stored in format described above. */
-char *files_start;
-
-/* The file stream currently open: */
-
-char *sourcebeg; /* beginning of contents */
-int sourcesize; /* size of contents */
-char *sourceptr; /* current read pointer */
-int sourceleft; /* number of bytes to eof */
-
-/* "descriptor" for the file now open.
- Incremented at each close.
- If specified descriptor does not match this,
- it means the program is trying to use a closed descriptor.
- We report an error for that. */
-
-int sourcedesc;
-
-open (char *filename, int modes)
-{
- char *next;
-
- if (modes)
- {
- errno = EROFS;
- return -1;
- }
-
- if (sourceptr)
- {
- errno = EMFILE;
- return -1;
- }
-
- for (next = files_start; *(int *) next; next += *(int *) next)
- {
- if (!strcmp (next + 4, filename))
- {
- sourcebeg = next + 4 + strlen (next + 4) + 1;
- sourcebeg = (char *) (((int) sourcebeg + 3) & (-4));
- sourceptr = sourcebeg;
- sourcesize = next + *(int *) next - sourceptr;
- sourceleft = sourcesize;
- return sourcedesc;
- }
- }
- return 0;
-}
-
-close (int desc)
-{
- sourceptr = 0;
- sourcedesc++;
- /* Don't let sourcedesc get big enough to be confused with stdin. */
- if (sourcedesc == 100)
- sourcedesc = 5;
-}
-
-FILE *
-fopen (char *filename, char *modes)
-{
- return (FILE *) open (filename, *modes == 'w');
-}
-
-FILE *
-fdopen (int desc)
-{
- return (FILE *) desc;
-}
-
-fclose (int desc)
-{
- close (desc);
-}
-
-fstat (int desc, struct stat *statbuf)
-{
- if (desc != sourcedesc)
- {
- errno = EBADF;
- return -1;
- }
- statbuf->st_size = sourcesize;
-}
-
-myread (int desc, char *destptr, int size, char *filename)
-{
- int len = min (sourceleft, size);
-
- if (desc != sourcedesc)
- {
- errno = EBADF;
- return -1;
- }
-
- memcpy (destptr, sourceptr, len);
- sourceleft -= len;
- return len;
-}
-
-int
-fread (int bufp, int numelts, int eltsize, int stream)
-{
- int elts = min (numelts, sourceleft / eltsize);
- int len = elts * eltsize;
-
- if (stream != sourcedesc)
- {
- errno = EBADF;
- return -1;
- }
-
- memcpy (bufp, sourceptr, len);
- sourceleft -= len;
- return elts;
-}
-
-int
-fgetc (int desc)
-{
-
- if (desc == (int) stdin)
- return tty_input ();
-
- if (desc != sourcedesc)
- {
- errno = EBADF;
- return -1;
- }
-
- if (sourceleft-- <= 0)
- return EOF;
- return *sourceptr++;
-}
-
-lseek (int desc, int pos)
-{
-
- if (desc != sourcedesc)
- {
- errno = EBADF;
- return -1;
- }
-
- if (pos < 0 || pos > sourcesize)
- {
- errno = EINVAL;
- return -1;
- }
-
- sourceptr = sourcebeg + pos;
- sourceleft = sourcesize - pos;
-}
-\f
-/* Output in kdb can go only to the terminal, so the stream
- specified may be ignored. */
-
-printf (int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8, int a9)
-{
- char buffer[1024];
- sprintf (buffer, a1, a2, a3, a4, a5, a6, a7, a8, a9);
- display_string (buffer);
-}
-
-fprintf (int ign, int a1, int a2, int a3, int a4, int a5, int a6, int a7,
- int a8, int a9)
-{
- char buffer[1024];
- sprintf (buffer, a1, a2, a3, a4, a5, a6, a7, a8, a9);
- display_string (buffer);
-}
-
-fwrite (char *buf, int numelts, int size, int stream)
-{
- int i = numelts * size;
- while (i-- > 0)
- fputc (*buf++, stream);
-}
-
-fputc (int c, int ign)
-{
- char buf[2];
- buf[0] = c;
- buf[1] = 0;
- display_string (buf);
-}
-
-/* sprintf refers to this, but loading this from the
- library would cause fflush to be loaded from it too.
- In fact there should be no need to call this (I hope). */
-
-_flsbuf (void)
-{
- error ("_flsbuf was actually called.");
-}
-
-fflush (int ign)
-{
-}
-\f
-/* Entries into core and inflow, needed only to make things link ok. */
-
-exec_file_command (void)
-{
-}
-
-core_file_command (void)
-{
-}
-
-char *
-get_exec_file (int err)
-{
- /* Makes one printout look reasonable; value does not matter otherwise. */
- return "run";
-}
-
-/* Nonzero if there is a core file. */
-
-have_core_file_p (void)
-{
- return 0;
-}
-
-kill_command (void)
-{
- inferior_ptid = null_ptid;
-}
-
-terminal_inferior (void)
-{
-}
-
-terminal_ours (void)
-{
-}
-
-terminal_init_inferior (void)
-{
-}
-
-write_inferior_register (void)
-{
-}
-
-read_inferior_register (void)
-{
-}
-
-read_memory (CORE_ADDR memaddr, char *myaddr, int len)
-{
- memcpy (myaddr, memaddr, len);
-}
-
-/* Always return 0 indicating success. */
-
-write_memory (CORE_ADDR memaddr, char *myaddr, int len)
-{
- memcpy (memaddr, myaddr, len);
- return 0;
-}
-
-static REGISTER_TYPE saved_regs[NUM_REGS];
-
-REGISTER_TYPE
-read_register (int regno)
-{
- if (regno < 0 || regno >= NUM_REGS)
- error ("Register number %d out of range.", regno);
- return saved_regs[regno];
-}
-
-void
-write_register (int regno, REGISTER_TYPE value)
-{
- if (regno < 0 || regno >= NUM_REGS)
- error ("Register number %d out of range.", regno);
- saved_regs[regno] = value;
-}
-\f
-/* System calls needed in relation to running the "inferior". */
-
-vfork (void)
-{
- /* Just appear to "succeed". Say the inferior's pid is 1. */
- return 1;
-}
-
-/* These are called by code that normally runs in the inferior
- that has just been forked. That code never runs, when standalone,
- and these definitions are so it will link without errors. */
-
-ptrace (void)
-{
-}
-
-setpgrp (void)
-{
-}
-
-execle (void)
-{
-}
-
-_exit (void)
-{
-}
-\f
-/* Malloc calls these. */
-
-malloc_warning (char *str)
-{
- printf ("\n%s.\n\n", str);
-}
-
-char *next_free;
-char *memory_limit;
-
-char *
-sbrk (int amount)
-{
- if (next_free + amount > memory_limit)
- return (char *) -1;
- next_free += amount;
- return next_free - amount;
-}
-
-/* Various ways malloc might ask where end of memory is. */
-
-char *
-ulimit (void)
-{
- return memory_limit;
-}
-
-int
-vlimit (void)
-{
- return memory_limit - next_free;
-}
-
-getrlimit (struct rlimit *addr)
-{
- addr->rlim_cur = memory_limit - next_free;
-}
-\f
-/* Context switching to and from program being debugged. */
-
-/* GDB calls here to run the user program.
- The frame pointer for this function is saved in
- gdb_stack by save_frame_pointer; then we restore
- all of the user program's registers, including PC and PS. */
-
-static int fault_code;
-static REGISTER_TYPE gdb_stack;
-
-resume (void)
-{
- REGISTER_TYPE restore[NUM_REGS];
-
- PUSH_FRAME_PTR;
- save_frame_pointer ();
-
- memcpy (restore, saved_regs, sizeof restore);
- POP_REGISTERS;
- /* Control does not drop through here! */
-}
-
-save_frame_pointer (CORE_ADDR val)
-{
- gdb_stack = val;
-}
-
-/* Fault handlers call here, running in the user program stack.
- They must first push a fault code,
- old PC, old PS, and any other info about the fault.
- The exact format is machine-dependent and is known only
- in the definition of PUSH_REGISTERS. */
-
-fault (void)
-{
- /* Transfer all registers and fault code to the stack
- in canonical order: registers in order of GDB register number,
- followed by fault code. */
- PUSH_REGISTERS;
-
- /* Transfer them to saved_regs and fault_code. */
- save_registers ();
-
- restore_gdb ();
- /* Control does not reach here */
-}
-
-restore_gdb (void)
-{
- CORE_ADDR new_fp = gdb_stack;
- /* Switch to GDB's stack */
- POP_FRAME_PTR;
- /* Return from the function `resume'. */
-}
-
-/* Assuming register contents and fault code have been pushed on the stack as
- arguments to this function, copy them into the standard place
- for the program's registers while GDB is running. */
-
-save_registers (int firstreg)
-{
- memcpy (saved_regs, &firstreg, sizeof saved_regs);
- fault_code = (&firstreg)[NUM_REGS];
-}
-
-/* Store into the structure such as `wait' would return
- the information on why the program faulted,
- converted into a machine-independent signal number. */
-
-static int fault_table[] = FAULT_TABLE;
-
-int
-wait (WAITTYPE *w)
-{
- WSETSTOP (*w, fault_table[fault_code / FAULT_CODE_UNITS]);
- return PIDGET (inferior_ptid);
-}
-\f
-/* Allocate a big space in which files for kdb to read will be stored.
- Whatever is left is where malloc can allocate storage.
-
- Initialize it, so that there will be space in the executable file
- for it. Then the files can be put into kdb by writing them into
- kdb's executable file. */
-
-/* The default size is as much space as we expect to be available
- for kdb to use! */
-
-#ifndef HEAP_SIZE
-#define HEAP_SIZE 400000
-#endif
-
-char heap[HEAP_SIZE] =
-{0};
-
-#ifndef STACK_SIZE
-#define STACK_SIZE 100000
-#endif
-
-int kdb_stack_beg[STACK_SIZE / sizeof (int)];
-int kdb_stack_end;
-
-_initialize_standalone (void)
-{
- char *next;
-
- /* Find start of data on files. */
-
- files_start = heap;
-
- /* Find the end of the data on files. */
-
- for (next = files_start; *(int *) next; next += *(int *) next)
- {
- }
-
- /* That is where free storage starts for sbrk to give out. */
- next_free = next;
-
- memory_limit = heap + sizeof heap;
-}
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