| /* Interface to bare machine for GDB running as kernel debugger. |
| Copyright (C) 1986, 1989, 1991 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 "signals.h" |
| #include "symtab.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "wait.h" |
| |
| |
| /* Random system calls, mostly no-ops to prevent link problems */ |
| |
| ioctl (desc, code, arg) |
| { |
| } |
| |
| int (*signal ()) () |
| { |
| } |
| |
| kill () |
| { |
| } |
| |
| getpid () |
| { |
| return 0; |
| } |
| |
| sigsetmask () |
| { |
| } |
| |
| chdir () |
| { |
| } |
| |
| char * |
| getcwd (buf, len) |
| char *buf; |
| unsigned int len; |
| { |
| buf[0] = '/'; |
| buf[1] = 0; |
| return buf; |
| } |
| |
| /* Used to check for existence of .gdbinit. Say no. */ |
| |
| access () |
| { |
| return -1; |
| } |
| |
| exit () |
| { |
| error ("Fatal error; restarting."); |
| } |
| |
| /* 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 (filename, modes) |
| char *filename; |
| int modes; |
| { |
| register 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 (desc) |
| int desc; |
| { |
| sourceptr = 0; |
| sourcedesc++; |
| /* Don't let sourcedesc get big enough to be confused with stdin. */ |
| if (sourcedesc == 100) |
| sourcedesc = 5; |
| } |
| |
| FILE * |
| fopen (filename, modes) |
| char *filename; |
| char *modes; |
| { |
| return (FILE *) open (filename, *modes == 'w'); |
| } |
| |
| FILE * |
| fdopen (desc) |
| int desc; |
| { |
| return (FILE *) desc; |
| } |
| |
| fclose (desc) |
| int desc; |
| { |
| close (desc); |
| } |
| |
| fstat (desc, statbuf) |
| struct stat *statbuf; |
| { |
| if (desc != sourcedesc) |
| { |
| errno = EBADF; |
| return -1; |
| } |
| statbuf->st_size = sourcesize; |
| } |
| |
| myread (desc, destptr, size, filename) |
| 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 (bufp, numelts, eltsize, stream) |
| { |
| register int elts = min (numelts, sourceleft / eltsize); |
| register int len = elts * eltsize; |
| |
| if (stream != sourcedesc) |
| { |
| errno = EBADF; |
| return -1; |
| } |
| |
| memcpy (bufp, sourceptr, len); |
| sourceleft -= len; |
| return elts; |
| } |
| |
| int |
| fgetc (desc) |
| int desc; |
| { |
| |
| if (desc == (int) stdin) |
| return tty_input (); |
| |
| if (desc != sourcedesc) |
| { |
| errno = EBADF; |
| return -1; |
| } |
| |
| if (sourceleft-- <= 0) |
| return EOF; |
| return *sourceptr++; |
| } |
| |
| lseek (desc, pos) |
| 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; |
| } |
| |
| /* Output in kdb can go only to the terminal, so the stream |
| specified may be ignored. */ |
| |
| printf (a1, a2, a3, a4, a5, a6, a7, a8, a9) |
| { |
| char buffer[1024]; |
| sprintf (buffer, a1, a2, a3, a4, a5, a6, a7, a8, a9); |
| display_string (buffer); |
| } |
| |
| fprintf (ign, a1, a2, a3, a4, a5, a6, a7, a8, a9) |
| { |
| char buffer[1024]; |
| sprintf (buffer, a1, a2, a3, a4, a5, a6, a7, a8, a9); |
| display_string (buffer); |
| } |
| |
| fwrite (buf, numelts, size, stream) |
| register char *buf; |
| int numelts, size; |
| { |
| register int i = numelts * size; |
| while (i-- > 0) |
| fputc (*buf++, stream); |
| } |
| |
| fputc (c, 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 () |
| { |
| error ("_flsbuf was actually called."); |
| } |
| |
| fflush (ign) |
| { |
| } |
| |
| /* Entries into core and inflow, needed only to make things link ok. */ |
| |
| exec_file_command () |
| { |
| } |
| |
| core_file_command () |
| { |
| } |
| |
| char * |
| get_exec_file (err) |
| 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 () |
| { |
| return 0; |
| } |
| |
| kill_command () |
| { |
| inferior_pid = 0; |
| } |
| |
| terminal_inferior () |
| { |
| } |
| |
| terminal_ours () |
| { |
| } |
| |
| terminal_init_inferior () |
| { |
| } |
| |
| write_inferior_register () |
| { |
| } |
| |
| read_inferior_register () |
| { |
| } |
| |
| read_memory (memaddr, myaddr, len) |
| CORE_ADDR memaddr; |
| char *myaddr; |
| int len; |
| { |
| memcpy (myaddr, memaddr, len); |
| } |
| |
| /* Always return 0 indicating success. */ |
| |
| write_memory (memaddr, myaddr, len) |
| CORE_ADDR memaddr; |
| char *myaddr; |
| int len; |
| { |
| memcpy (memaddr, myaddr, len); |
| return 0; |
| } |
| |
| static REGISTER_TYPE saved_regs[NUM_REGS]; |
| |
| REGISTER_TYPE |
| read_register (regno) |
| int regno; |
| { |
| if (regno < 0 || regno >= NUM_REGS) |
| error ("Register number %d out of range.", regno); |
| return saved_regs[regno]; |
| } |
| |
| void |
| write_register (regno, value) |
| int regno; |
| REGISTER_TYPE value; |
| { |
| if (regno < 0 || regno >= NUM_REGS) |
| error ("Register number %d out of range.", regno); |
| saved_regs[regno] = value; |
| } |
| |
| /* System calls needed in relation to running the "inferior". */ |
| |
| vfork () |
| { |
| /* 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 () |
| { |
| } |
| |
| setpgrp () |
| { |
| } |
| |
| execle () |
| { |
| } |
| |
| _exit () |
| { |
| } |
| |
| /* Malloc calls these. */ |
| |
| malloc_warning (str) |
| char *str; |
| { |
| printf ("\n%s.\n\n", str); |
| } |
| |
| char *next_free; |
| char *memory_limit; |
| |
| char * |
| sbrk (amount) |
| 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 () |
| { |
| return memory_limit; |
| } |
| |
| int |
| vlimit () |
| { |
| return memory_limit - next_free; |
| } |
| |
| getrlimit (addr) |
| struct rlimit *addr; |
| { |
| addr->rlim_cur = memory_limit - next_free; |
| } |
| |
| /* 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 () |
| { |
| 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 (val) |
| 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 () |
| { |
| /* 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 () |
| { |
| 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 (firstreg) |
| 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 (w) |
| WAITTYPE *w; |
| { |
| WSETSTOP (*w, fault_table[fault_code / FAULT_CODE_UNITS]); |
| return inferior_pid; |
| } |
| |
| /* 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 () |
| { |
| register 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; |
| } |