Initial creation of sourceware repository

sim/arm/main.c

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+/*  main.c -- top level of ARMulator:  ARM6 Instruction Emulator.
+    Copyright (C) 1994 Advanced RISC Machines Ltd.
+ 
+    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. */
+
+/**********************************************************************/
+/* Forks the ARMulator and hangs on a socket passing on RDP messages  */
+/* down a pipe to the ARMulator which translates them into RDI calls. */
+/**********************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <netdb.h>
+#include <unistd.h>
+
+#include "armdefs.h"
+#include "dbg_rdi.h"
+#include "dbg_conf.h"
+
+#define MAXHOSTNAMELENGTH 64
+
+/* Read and write routines down sockets and pipes */
+
+void MYread_chars(int sock, void *p, int n);
+unsigned char MYread_char(int sock);
+ARMword MYread_word(int sock);
+void MYread_FPword(int sock, char *putinhere);
+
+void MYwrite_word(int sock, ARMword i);
+void MYwrite_string(int sock, char *s);
+void MYwrite_FPword(int sock, char *fromhere);
+void MYwrite_char(int sock, unsigned char c);
+
+void passon(int source, int dest, int n);
+
+
+/* Mother and child processes */
+void parent (void);
+void kid(void);
+
+/* The child process id. */
+pid_t child;
+
+/* The socket to the debugger */
+int debugsock;
+
+/* The pipes between the two processes */
+int mumkid[2];
+int kidmum[2];
+
+/* A pipe for handling SWI return values that goes straight from the */
+/* parent to the ARMulator host interface, bypassing the childs RDP */
+/* to RDI interpreter */
+int DebuggerARMul[2];
+
+/* The maximum number of file descriptors */
+int nfds;
+
+/* The socket handle */
+int sockethandle;
+
+/* The machine name */
+char localhost[MAXHOSTNAMELENGTH + 1];
+
+/* The socket number */
+unsigned int socketnumber;
+
+/**************************************************************/
+/* Takes one argument: the socket number.                     */
+/* Opens a socket to the debugger, and once opened spawns the */
+/* ARMulator and sets up a couple of pipes.                   */
+/**************************************************************/
+int main(int argc, char *argv[]) {
+  int i;
+  struct sockaddr_in devil, isa;
+  struct hostent *hp;
+
+
+  if (argc == 1) {
+    fprintf(stderr, "No socket number\n");
+    return 1;
+  }
+
+  sscanf(argv[1], "%d", &socketnumber);
+  if (!socketnumber || socketnumber > 0xffff) {
+    fprintf(stderr, "Invalid socket number: %d\n", socketnumber);
+    return 1;
+  }
+
+  gethostname(localhost, MAXHOSTNAMELENGTH);
+  hp = gethostbyname(localhost);
+  if (!hp) {
+    fprintf(stderr, "Cannot get local host info\n");
+    return 1;
+  }
+
+  /* Open a socket */
+  sockethandle = socket(hp->h_addrtype, SOCK_STREAM, 0);
+  if (sockethandle < 0) {
+    perror("socket");
+    return 1;
+  }
+
+  devil.sin_family = hp->h_addrtype;
+  devil.sin_port = htons(socketnumber);
+  devil.sin_addr.s_addr = 0;
+  for(i = 0; i < sizeof(devil.sin_zero); i++) devil.sin_zero[i] = '\000';
+  memcpy(&devil.sin_addr, hp->h_addr_list[0], hp->h_length);
+
+  if (bind(sockethandle, &devil, sizeof(devil)) < 0) {
+    perror("bind");
+    return 1;
+  }
+
+  /* May only accept one debugger at once */
+
+  if (listen(sockethandle, 0)) {
+    perror("listen");
+    return 1;
+  }
+
+  fprintf(stderr, "Waiting for connection from debugger...");
+
+  debugsock = accept(sockethandle, &isa, &i);
+  if (debugsock < 0) {
+    perror("accept");
+    return 1;
+  }
+  
+  fprintf(stderr, " done.\nConnection Established.\n");
+
+  nfds = getdtablesize();
+
+  if (pipe(mumkid)) {
+    perror("pipe");
+    return 1;
+  }
+  if (pipe(kidmum)) {
+    perror("pipe");
+    return 1;
+  }
+  
+  if (pipe(DebuggerARMul)) {
+    perror("pipe");
+    return 1;
+  }
+  
+#ifdef DEBUG
+      fprintf(stderr, "Created pipes ok\n");
+#endif
+
+  child = fork();
+
+#ifdef DEBUG
+  fprintf(stderr, "fork() ok\n");
+#endif
+
+  if (child ==  0) kid ();
+  if (child != -1) parent ();
+
+  perror("fork");
+  return 1;
+}
+
+
+
+