VEX/unused/dispatch.c

   1
   2 /*---------------------------------------------------------------*/
   3 /*--- begin                                        dispatch.c ---*/
   4 /*---------------------------------------------------------------*/
   5
   6 #include "basictypes.h"
   7
   8
   9 /* --------------------------------------------------------- */
  10 /* TRANSLATION TABLE/CACHE                                   */
  11 /* --------------------------------------------------------- */
  12
  13 static
  14 char* find_translation ( char* orig )
  15 {
  16    int i;
  17    for (i = 0; i < n_transtab_used; i++)
  18       if (transtab[i].orig == orig)
  19          return transtab[i].trans;
  20    return NULL;
  21 }
  22
  23
  24 #define N_TT_ENTRIES 1000
  25
  26 typedef
  27    struct {
  28       char* orig;
  29       int   orig_size;
  30       char* trans;
  31       int   trans_size;
  32    }
  33    TTEntry;
  34
  35 int n_transtab_used = 0;
  36 TTEntry transtab[N_TT_ENTRIES];
  37
  38
  39 /* Call here to add a translation to the trans cache.
  40    Supplied translation is in mallocville.  add_translation should
  41    copy it out as the caller will free it on return.  */
  42
  43 /* EXPORTED */
  44 void add_translation ( char* orig, int orig_size, char* trans, int trans_size )
  45 {
  46    int i;
  47    assert(n_transtab_used < N_TT_ENTRIES);
  48    transtab[n_transtab_used].orig       = orig;
  49    transtab[n_transtab_used].orig_size  = orig_size;
  50    transtab[n_transtab_used].trans_size = trans_size;
  51
  52    transtab[n_transtab_used].trans = malloc(trans_size);
  53    assert(transtab[n_transtab_used].trans != NULL);
  54    for (i = 0; i < trans_size; i++)
  55       transtab[n_transtab_used].trans[i] = trans[i];
  56
  57 #ifdef arm_TARGET_ARCH
  58    arm_notify_new_code(transtab[n_transtab_used].trans, trans_size);
  59 #endif
  60
  61    n_transtab_used++;
  62 }
  63
  64 /* Run the simulated machine for a while.  Returns when a new BB needs
  65    to be translated, and returns its address.  Returns NULL when we
  66    want to stop. */
  67
  68 /* EXPORTED */
  69 char* run_machine ( void )
  70 {
  71    char* nextpc_orig;
  72    char* nextpc_trans;
  73    while (1) {
  74       nextpc_orig = (char*)(regs_arm[REG_PC]);
  75       if (nextpc_orig == stop_at)
  76          return NULL;
  77       nextpc_trans = find_translation(nextpc_orig);
  78       if (nextpc_trans == NULL)
  79          return nextpc_orig;
  80       run_translation(nextpc_trans, (char*) &regs_arm[0] );
  81    }
  82 }
  83
  84
  85 /* HOW TO USE:
  86
  87    for a main fn :: void main ( void )
  88
  89    * load .o's, link, etc
  90
  91    * call initialise_machine with & main
  92
  93    * call run_machine repeatedly.  If it returns NULL, stop.  Else
  94      make a translation of the returned address, pass it to
  95      add_translation, and resume running by calling run_machine.
  96
  97 */