mirror of
https://github.com/darlinghq/darling-gdb.git
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484 lines
12 KiB
C
484 lines
12 KiB
C
/* parent.c -- ARMulator RDP comms code: ARM6 Instruction Emulator.
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Copyright (C) 1994 Advanced RISC Machines Ltd.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*****************************************************************/
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/* The Parent process continues here... */
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/* It waits on the socket and passes on RDP messages down a pipe */
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/* to the ARMulator RDP to RDI interpreter. */
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/*****************************************************************/
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#include <stdio.h>
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#include <sys/types.h>
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#include <signal.h>
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#include "time.h"
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#include "armdefs.h"
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#include "dbg_rdi.h"
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#include "communicate.h"
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/* The socket to the debugger */
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extern int debugsock;
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/* The pipes between the two processes */
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extern int mumkid[2];
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extern int kidmum[2];
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/* A pipe for handling SWI return values that goes straight from the */
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/* parent to the ARMulator host interface, bypassing the child's RDP */
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/* to RDI interpreter */
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extern int DebuggerARMul[2];
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/* The maximum number of file descriptors */
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extern int nfds;
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/* The child process id. */
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extern pid_t child;
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void
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parent ()
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{
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int i, j, k;
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unsigned char message, CPnum, exreturn;
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ARMword mask, nbytes, messagetype;
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unsigned char c, d;
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ARMword x, y;
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int virgin = 1;
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struct fd_set readfds;
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#ifdef DEBUG
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fprintf (stderr, "parent ()...\n");
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#endif
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panic_error:
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if (!virgin)
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{
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#ifdef DEBUG
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fprintf(stderr, "Arghh! What is going on?\n");
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#endif
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kill (child, SIGHUP);
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MYwrite_char(debugsock, RDP_Reset);
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}
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virgin = 0;
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while (1)
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{
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/* Wait either for the ARMulator or the debugger */
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FD_ZERO (&readfds);
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FD_SET (kidmum[0], &readfds); /* Wait for messages from ARMulator */
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FD_SET (debugsock, &readfds); /* Wait for messages from debugger */
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#ifdef DEBUG
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fprintf (stderr, "Waiting for ARMulator or debugger... ");
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#endif
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while ((i = select (nfds, &readfds, (fd_set *) 0, (fd_set *) 0, 0)) < 0)
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{
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perror ("select");
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}
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#ifdef DEBUG
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fprintf(stderr, "(%d/2)", i);
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#endif
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if (FD_ISSET (debugsock, &readfds)) {
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#ifdef DEBUG
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fprintf (stderr, "->debugger\n");
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#endif
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/* Inside this rather large if statement with simply pass on a complete
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message to the ARMulator. The reason we need to pass messages on one
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at a time is that we have to know whether the message is an OSOpReply
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or an info(stop), so that we can take different action in those
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cases. */
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if (MYread_char (debugsock, &message))
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goto panic_error;
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switch (message)
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{
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case RDP_Start:
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/* Open and/or Initialise */
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#ifdef DEBUG
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fprintf (stderr, "RDP Open\n");
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#endif
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if (MYread_char(debugsock, &c)) /* type */
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goto panic_error;
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if (MYread_word(debugsock, &x)) /* memory size */
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goto panic_error;
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MYwrite_char (mumkid[1], message);
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MYwrite_char (mumkid[1], c);
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MYwrite_word (mumkid[1], x);
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if (c & 0x2)
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{
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passon (debugsock, mumkid[1], 1); /* speed */
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}
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break;
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case RDP_End:
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/* Close and Finalise */
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#ifdef DEBUG
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fprintf(stderr, "RDP Close\n");
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#endif
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MYwrite_char (mumkid[1], message);
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break;
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case RDP_Read:
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/* Read Memory Address */
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#ifdef DEBUG
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fprintf (stderr, "RDP Read Memory\n");
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#endif
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MYwrite_char (mumkid[1], message);
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if (passon (debugsock, mumkid[1], 4))
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goto panic_error; /* address */
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if (MYread_word(debugsock, &nbytes))
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goto panic_error; /* nbytes */
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MYwrite_word (mumkid[1], nbytes);
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break;
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case RDP_Write :
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/* Write Memory Address */
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#ifdef DEBUG
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fprintf (stderr, "RDP Write Memory\n");
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#endif
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if (MYread_word (debugsock, &x))
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goto panic_error; /* address */
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if (MYread_word (debugsock, &y))
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goto panic_error; /* nbytes */
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], x);
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MYwrite_word (mumkid[1], y);
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passon (debugsock, mumkid[1], y); /* actual data */
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break;
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case RDP_CPUread:
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/* Read CPU State */
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#ifdef DEBUG
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fprintf (stderr, "RDP Read CPU\n");
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#endif
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if (MYread_char(debugsock, &c))
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goto panic_error; /* mode */
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if (MYread_word (debugsock, &mask))
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goto panic_error; /* mask */
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MYwrite_char (mumkid[1], message);
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MYwrite_char (mumkid[1], c);
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MYwrite_word (mumkid[1], mask);
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break;
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case RDP_CPUwrite :
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/* Write CPU State */
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#ifdef DEBUG
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fprintf (stderr, "RDP Write CPU\n");
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#endif
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if (MYread_char (debugsock, &c))
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goto panic_error; /* mode */
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if (MYread_word (debugsock, &x))
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goto panic_error; /* mask */
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MYwrite_char (mumkid[1], message);
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MYwrite_char (mumkid[1], c);
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MYwrite_word (mumkid[1], x);
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for (k = 1, j = 0; k != 0x80000000; k *= 2, j++)
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if ((k & x)
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&& passon(debugsock, mumkid[1], 4))
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goto panic_error;
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break;
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case RDP_CPread:
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/* Read Co-Processor State */
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#ifdef DEBUG
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fprintf (stderr, "RDP Read CP state\n");
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#endif
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if (MYread_char (debugsock, &CPnum))
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goto panic_error;
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if (MYread_word (debugsock, &mask))
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goto panic_error;
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MYwrite_char (mumkid[1], message);
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MYwrite_char (mumkid[1], CPnum);
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MYwrite_word (mumkid[1], mask);
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break;
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case RDP_CPwrite:
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/* Write Co-Processor State */
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#ifdef DEBUG
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fprintf(stderr, "RDP Write CP state\n");
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#endif
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if (MYread_char (debugsock, &CPnum))
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goto panic_error;
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if (MYread_word (debugsock, &mask))
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goto panic_error;
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MYwrite_char (mumkid[1], message);
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MYwrite_char (mumkid[1], c);
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MYwrite_char (mumkid[1], x);
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for (k = 1, j = 0; k != 0x80000000; k *= 2, j++)
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if (k & x)
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{
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if ((c == 1 || c == 2) && k <= 128)
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{
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/* FP register = 12 bytes + 4 bytes format */
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if (passon(debugsock, mumkid[1], 16))
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goto panic_error;
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}
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else
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{
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/* Normal register = 4 bytes */
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if (passon(debugsock, mumkid[1], 4))
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goto panic_error;
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}
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}
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break;
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case RDP_SetBreak:
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/* Set Breakpoint */
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#ifdef DEBUG
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fprintf (stderr, "RDP Set Breakpoint\n");
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#endif
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if (MYread_word (debugsock, &x))
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goto panic_error; /* address */
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if (MYread_char (debugsock, &c))
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goto panic_error; /* type */
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], x);
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MYwrite_char (mumkid[1], c);
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if (((c & 0xf) >= 5)
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&& passon(debugsock, mumkid[1], 4))
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goto panic_error; /* bound */
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break;
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case RDP_ClearBreak:
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/* Clear Breakpoint */
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#ifdef DEBUG
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fprintf (stderr, "RDP Clear Breakpoint\n");
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#endif
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MYwrite_char (mumkid[1], message);
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if (passon (debugsock, mumkid[1], 4))
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goto panic_error; /* point */
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break;
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case RDP_SetWatch:
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/* Set Watchpoint */
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#ifdef DEBUG
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fprintf (stderr, "RDP Set Watchpoint\n");
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#endif
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if (MYread_word (debugsock, &x))
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goto panic_error; /* address */
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if (MYread_char(debugsock, &c))
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goto panic_error; /* type */
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if (MYread_char (debugsock, &d))
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goto panic_error; /* datatype */
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], x);
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MYwrite_char (mumkid[1], c);
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MYwrite_char (mumkid[1], d);
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if (((c & 0xf) >= 5)
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&& passon(debugsock, mumkid[1], 4))
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goto panic_error; /* bound */
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break;
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case RDP_ClearWatch:
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/* Clear Watchpoint */
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#ifdef DEBUG
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fprintf (stderr, "RDP Clear Watchpoint\n");
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#endif
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MYwrite_char (mumkid[1], message);
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if (passon (debugsock, mumkid[1], 4))
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goto panic_error; /* point */
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break;
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case RDP_Execute:
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/* Excecute */
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#ifdef DEBUG
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fprintf (stderr, "RDP Execute\n");
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#endif
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/* LEAVE THIS ONE 'TIL LATER... */
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/* NEED TO WORK THINGS OUT */
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/* NO ASCYNCHROUS RUNNING */
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if (MYread_char(debugsock, &c))
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goto panic_error; /* return */
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/* Remember incase bit 7 is set and we have to send back a word */
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exreturn = c;
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MYwrite_char(mumkid[1], message);
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MYwrite_char(mumkid[1], c);
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break;
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case RDP_Step:
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/* Step */
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#ifdef DEBUG
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fprintf (stderr, "RDP Step\n");
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#endif
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if (MYread_char(debugsock, &c))
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goto panic_error; /* return */
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if (MYread_word(debugsock, &x))
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goto panic_error; /* ninstr */
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MYwrite_char (mumkid[1], message);
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MYwrite_char (mumkid[1], c);
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MYwrite_word (mumkid[1], x);
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break;
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case RDP_Info:
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/* Info */
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#ifdef DEBUG
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fprintf (stderr, "RDP Info\n");
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#endif
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/* INFO TARGET, SET RDI LEVEL */
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if (MYread_word (debugsock, &messagetype))
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goto panic_error; /* info */
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switch (messagetype)
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{
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case RDIInfo_Target:
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], messagetype);
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break;
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case RDISet_RDILevel:
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], messagetype);
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if (passon (debugsock, mumkid[1], 1))
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goto panic_error; /* argument */
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break;
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case RDISet_Cmdline:
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/* Got to pass on a string argument */
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], messagetype);
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do
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{
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if (MYread_char (debugsock, &c))
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goto panic_error;
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MYwrite_char (mumkid[1], c);
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} while (c);
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break;
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case RDISignal_Stop:
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kill (child, SIGUSR1);
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MYwrite_char (debugsock, RDP_Return);
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MYwrite_char (debugsock, RDIError_UserInterrupt);
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break;
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case RDIVector_Catch:
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MYread_word (debugsock, &x);
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], messagetype);
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MYwrite_word (mumkid[1], x);
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break;
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case RDIInfo_Step:
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], messagetype);
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break;
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case RDIInfo_Points:
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MYwrite_char (mumkid[1], message);
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MYwrite_word (mumkid[1], messagetype);
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break;
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default:
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fprintf (stderr, "Unrecognized RDIInfo request %d\n",
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messagetype);
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goto panic_error;
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}
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break;
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case RDP_OSOpReply:
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/* OS Operation Reply */
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#ifdef DEBUG
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fprintf (stderr, "RDP OS Reply\n");
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#endif
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MYwrite_char (mumkid[1], message);
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if (MYread_char (debugsock, &message))
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goto panic_error;
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MYwrite_char (mumkid[1], message);
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switch(message)
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{
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case 0: /* return value i.e. nothing else.*/
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break;
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case 1: /* returns a byte... */
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if (MYread_char(debugsock, &c))
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goto panic_error;
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MYwrite_char (mumkid[1], c);
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break;
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case 2: /* returns a word... */
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if (MYread_word(debugsock, &x))
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goto panic_error;
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MYwrite_word (mumkid[1], x);
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break;
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}
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break;
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case RDP_Reset:
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/* Reset */
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#ifdef DEBUG
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fprintf (stderr, "RDP Reset\n");
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#endif
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MYwrite_char (mumkid[1], message);
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break;
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default:
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/* Hmm.. bad RDP operation */
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fprintf (stderr, "RDP Bad RDP request (%d)\n", message);
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MYwrite_char (debugsock, RDP_Return);
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MYwrite_char (debugsock, RDIError_UnimplementedMessage);
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break;
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}
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}
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if (FD_ISSET (kidmum[0], &readfds))
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{
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#ifdef DEBUG
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fprintf (stderr, "->ARMulator\n");
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#endif
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/* Anything we get from the ARMulator has to go to the debugger... */
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/* It is that simple! */
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passon (kidmum[0], debugsock, 1);
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}
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}
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}
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