sim/arm/main.c

   1 /*  main.c -- top level of ARMulator:  ARM6 Instruction Emulator.
   2     Copyright (C) 1994 Advanced RISC Machines Ltd.
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  17
  18 /**********************************************************************/
  19 /* Forks the ARMulator and hangs on a socket passing on RDP messages  */
  20 /* down a pipe to the ARMulator which translates them into RDI calls. */
  21 /**********************************************************************/
  22
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <netinet/in.h>
  28 #include <signal.h>
  29 #include <netdb.h>
  30 #include <unistd.h>
  31
  32 #include "armdefs.h"
  33 #include "dbg_rdi.h"
  34 #include "dbg_conf.h"
  35
  36 #define MAXHOSTNAMELENGTH 64
  37
  38 /* Read and write routines down sockets and pipes */
  39
  40 void MYread_chars(int sock, void *p, int n);
  41 unsigned char MYread_char(int sock);
  42 ARMword MYread_word(int sock);
  43 void MYread_FPword(int sock, char *putinhere);
  44
  45 void MYwrite_word(int sock, ARMword i);
  46 void MYwrite_string(int sock, char *s);
  47 void MYwrite_FPword(int sock, char *fromhere);
  48 void MYwrite_char(int sock, unsigned char c);
  49
  50 void passon(int source, int dest, int n);
  51
  52
  53 /* Mother and child processes */
  54 void parent (void);
  55 void kid(void);
  56
  57 /* The child process id. */
  58 pid_t child;
  59
  60 /* The socket to the debugger */
  61 int debugsock;
  62
  63 /* The pipes between the two processes */
  64 int mumkid[2];
  65 int kidmum[2];
  66
  67 /* A pipe for handling SWI return values that goes straight from the */
  68 /* parent to the ARMulator host interface, bypassing the childs RDP */
  69 /* to RDI interpreter */
  70 int DebuggerARMul[2];
  71
  72 /* The maximum number of file descriptors */
  73 int nfds;
  74
  75 /* The socket handle */
  76 int sockethandle;
  77
  78 /* The machine name */
  79 char localhost[MAXHOSTNAMELENGTH + 1];
  80
  81 /* The socket number */
  82 unsigned int socketnumber;
  83
  84 /**************************************************************/
  85 /* Takes one argument: the socket number.                     */
  86 /* Opens a socket to the debugger, and once opened spawns the */
  87 /* ARMulator and sets up a couple of pipes.                   */
  88 /**************************************************************/
  89 int main(int argc, char *argv[]) {
  90   int i;
  91   struct sockaddr_in devil, isa;
  92   struct hostent *hp;
  93
  94
  95   if (argc == 1) {
  96     fprintf(stderr, "No socket number\n");
  97     return 1;
  98   }
  99
 100   sscanf(argv[1], "%d", &socketnumber);
 101   if (!socketnumber || socketnumber > 0xffff) {
 102     fprintf(stderr, "Invalid socket number: %d\n", socketnumber);
 103     return 1;
 104   }
 105
 106   gethostname(localhost, MAXHOSTNAMELENGTH);
 107   hp = gethostbyname(localhost);
 108   if (!hp) {
 109     fprintf(stderr, "Cannot get local host info\n");
 110     return 1;
 111   }
 112
 113   /* Open a socket */
 114   sockethandle = socket(hp->h_addrtype, SOCK_STREAM, 0);
 115   if (sockethandle < 0) {
 116     perror("socket");
 117     return 1;
 118   }
 119
 120   devil.sin_family = hp->h_addrtype;
 121   devil.sin_port = htons(socketnumber);
 122   devil.sin_addr.s_addr = 0;
 123   for(i = 0; i < sizeof(devil.sin_zero); i++) devil.sin_zero[i] = '\000';
 124   memcpy(&devil.sin_addr, hp->h_addr_list[0], hp->h_length);
 125
 126   if (bind(sockethandle, &devil, sizeof(devil)) < 0) {
 127     perror("bind");
 128     return 1;
 129   }
 130
 131   /* May only accept one debugger at once */
 132
 133   if (listen(sockethandle, 0)) {
 134     perror("listen");
 135     return 1;
 136   }
 137
 138   fprintf(stderr, "Waiting for connection from debugger...");
 139
 140   debugsock = accept(sockethandle, &isa, &i);
 141   if (debugsock < 0) {
 142     perror("accept");
 143     return 1;
 144   }
 145
 146   fprintf(stderr, " done.\nConnection Established.\n");
 147
 148   nfds = getdtablesize();
 149
 150   if (pipe(mumkid)) {
 151     perror("pipe");
 152     return 1;
 153   }
 154   if (pipe(kidmum)) {
 155     perror("pipe");
 156     return 1;
 157   }
 158
 159   if (pipe(DebuggerARMul)) {
 160     perror("pipe");
 161     return 1;
 162   }
 163
 164 #ifdef DEBUG
 165       fprintf(stderr, "Created pipes ok\n");
 166 #endif
 167
 168   child = fork();
 169
 170 #ifdef DEBUG
 171   fprintf(stderr, "fork() ok\n");
 172 #endif
 173
 174   if (child ==  0) kid ();
 175   if (child != -1) parent ();
 176
 177   perror("fork");
 178   return 1;
 179 }
 180
 181
 182
 183