[deliverable/binutils-gdb.git] / sim / arm / armrdi.c

/*  armrdi.c -- ARMulator RDI interface:  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., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <string.h>
#include <ctype.h>
#include "armdefs.h"
#include "armemu.h"
#include "armos.h"
#include "dbg_cp.h"
#include "dbg_conf.h"
#include "dbg_rdi.h"
#include "dbg_hif.h"
#include "communicate.h"

/***************************************************************************\
*                               Declarations                                *
\***************************************************************************/

#define Watch_AnyRead (RDIWatch_ByteRead+RDIWatch_HalfRead+RDIWatch_WordRead)
#define Watch_AnyWrite (RDIWatch_ByteWrite+RDIWatch_HalfWrite+RDIWatch_WordWrite)

static unsigned FPRegsAddr ; /* last known address of FPE regs */
#define FPESTART 0x2000L
#define FPEEND   0x8000L

#define IGNORE(d) (d = d)
#ifdef RDI_VERBOSE
#define TracePrint(s) \
 if (rdi_log & 1) ARMul_DebugPrint s
#else
#define TracePrint(s)
#endif

static ARMul_State *state = NULL ;
static unsigned BreaksSet ; /* The number of breakpoints set */

static int rdi_log = 0 ; /* debugging  ? */

#define LOWEST_RDI_LEVEL 0
#define HIGHEST_RDI_LEVEL 1
static int MYrdi_level = LOWEST_RDI_LEVEL;

typedef struct BreakNode BreakNode;
typedef struct WatchNode WatchNode;

struct BreakNode { /* A breakpoint list node */
   BreakNode *next ;
   ARMword address ; /* The address of this breakpoint */
   unsigned type ; /* The type of comparison */
   ARMword bound ; /* The other address for a range */
   ARMword inst;
   };

struct WatchNode { /* A watchpoint list node */
   WatchNode *next ;
   ARMword address ; /* The address of this watchpoint */
   unsigned type ; /* The type of comparison */
   unsigned datatype ; /* The type of access to watch for */
   ARMword bound ; /* The other address for a range */
   };

BreakNode *BreakList = NULL ;
WatchNode *WatchList = NULL ;

void ARMul_DebugPrint_i(const Dbg_HostosInterface *hostif, const char *format, ...)
{ va_list ap;
  va_start(ap, format);
  hostif->dbgprint(hostif->dbgarg, format, ap);
  va_end(ap);
}

void ARMul_DebugPrint(ARMul_State *state, const char *format, ...)
{ va_list ap;
  va_start(ap, format);
  if(!(rdi_log & 8))
    state->hostif->dbgprint(state->hostif->dbgarg, format, ap);
  va_end(ap);
}

#define CONSOLE_PRINT_MAX_LEN 128

void ARMul_ConsolePrint(ARMul_State *state, const char *format, ...)
{
  va_list ap;
  int ch;
  char *str, buf[CONSOLE_PRINT_MAX_LEN];
  int i, j;
  ARMword junk;

  va_start(ap, format);
  vsprintf(buf, format, ap);

  for (i = 0; buf[i] ;i++);  /* The string is i chars long */
  
  str = buf;
  while (i >= 32) {
    MYwrite_char(kidmum[1], RDP_OSOp); 
    MYwrite_word(kidmum[1], SWI_Write0);
    MYwrite_char(kidmum[1], OS_SendString);
    MYwrite_char(kidmum[1], 32); /* Send string 32bytes at a time */
    for (j = 0; j < 32; j++, str++)
      MYwrite_char(kidmum[1], *str);
    wait_for_osreply(&junk);
    i -= 32;
  }
  
  if (i > 0) {
    MYwrite_char(kidmum[1], RDP_OSOp);
    MYwrite_word(kidmum[1], SWI_Write0);
    MYwrite_char(kidmum[1], OS_SendString);
    MYwrite_char(kidmum[1], (unsigned char) i); /* Send remainder of string  */
    for (j = 0; j < i; j++, str++)
      MYwrite_char(kidmum[1], *str);
    wait_for_osreply(&junk);
  }
  return;

/*   str = buf; */
/*   while ((ch=*str++) != 0) */
/*     state->hostif->writec(state->hostif->hostosarg, ch); */
}

void ARMul_DebugPause(ARMul_State *state)
{
  if(!(rdi_log & 8))
  state->hostif->dbgpause(state->hostif->dbgarg);
}

/***************************************************************************\
*                                 RDI_open                                  *
\***************************************************************************/

static void InitFail(int exitcode, char const *which) {
  ARMul_ConsolePrint(state, "%s interface failed to initialise. Exiting\n",
                            which);
  exit(exitcode);
}

static void RDIInit(unsigned type)
{if (type == 0) { /* cold start */
    state->CallDebug = state->MemReadDebug = state->MemWriteDebug = 0 ;
    BreaksSet = 0 ;
    }
 }

#define UNKNOWNPROC 0

typedef struct { char name[16]; unsigned val; } Processor;

Processor const p_arm2   = {"ARM2",    ARM2};
Processor const p_arm2as = {"ARM2AS",  ARM2as};
Processor const p_arm61  = {"ARM61",   ARM61};
Processor const p_arm3   = {"ARM3",    ARM3};
Processor const p_arm6   = {"ARM6",    ARM6};
Processor const p_arm60  = {"ARM60",   ARM60};
Processor const p_arm600 = {"ARM600",  ARM600};
Processor const p_arm610 = {"ARM610",  ARM610};
Processor const p_arm620 = {"ARM620",  ARM620};
Processor const p_unknown= {"",      UNKNOWNPROC};

Processor const *const processors[] = {
  &p_arm6,  /* default: must come first */
  &p_arm2,
  &p_arm2as,
  &p_arm61,
  &p_arm3,
  &p_arm60,
  &p_arm600,
  &p_arm610,
  &p_arm620,
  &p_unknown
};

typedef struct ProcessorConfig ProcessorConfig;
struct ProcessorConfig {
  long id[2];
  ProcessorConfig const *self;
  long count;
  Processor const * const *processors;
};

ProcessorConfig const processorconfig = {
  { ((((((long)'x' << 8) | ' ') << 8) | 'c') << 8) | 'p',
    ((((((long)'u' << 8) | 's') << 8) | ' ') << 8) | 'x'
  },
  &processorconfig,
  16,
  processors
};

static int RDI_open(unsigned type, const Dbg_ConfigBlock *config,
                    const Dbg_HostosInterface *hostif,
                    struct Dbg_MCState *dbg_state)
/* Initialise everything */
{int virgin = (state == NULL);
 IGNORE(dbg_state);

#ifdef RDI_VERBOSE
 if (rdi_log & 1) {
    if (virgin)
       ARMul_DebugPrint_i(hostif, "RDI_open: type = %d\n",type) ;
    else
       ARMul_DebugPrint(state, "RDI_open: type = %d\n",type) ;
 }
#endif

 if (type & 1) { /* Warm start */
    ARMul_Reset(state) ;
    RDIInit(1) ;
    }
 else {
   if (virgin) {
     ARMul_EmulateInit();
     state = ARMul_NewState();
     state->hostif = hostif;
     { int req = config->processor;
       unsigned processor = processors[req]->val;
       ARMul_SelectProcessor(state, processor);
       ARMul_Reset(state);
       ARMul_ConsolePrint(state, "ARMulator V1.50, %s", processors[req]->name);
     }
     if (ARMul_MemoryInit(state,config->memorysize) == FALSE)
       InitFail(1, "Memory");
     if (config->bytesex != RDISex_DontCare)
       state->bigendSig = config->bytesex ;
     if (ARMul_CoProInit(state) == FALSE)
       InitFail(2, "Co-Processor");
     if (ARMul_OSInit(state) == FALSE)
       InitFail(3, "Operating System");
   }
   ARMul_Reset(state) ;
   RDIInit(0) ;
   }
  if (type & 2) { /* Reset the comms link */
    /* what comms link ? */
  }
  if (virgin && (type & 1) == 0) /* Cold start */
    ARMul_ConsolePrint(state, ", %s endian.\n",
		       state->bigendSig ? "Big" : "Little");

  if (config->bytesex == RDISex_DontCare)
    return(state->bigendSig ? RDIError_BigEndian : RDIError_LittleEndian);
  else
    return(RDIError_NoError) ;
}

/***************************************************************************\
*                                RDI_close                                  *
\***************************************************************************/

static int RDI_close(void)
{
 TracePrint((state, "RDI_close\n"));
 ARMul_OSExit(state) ;
 ARMul_CoProExit(state) ;
 ARMul_MemoryExit(state) ;
 return(RDIError_NoError) ;
 }

/***************************************************************************\
*                                 RDI_read                                  *
\***************************************************************************/

static int RDI_read(ARMword source, void *dest, unsigned *nbytes)
{unsigned i ;
 char *memptr = (char *)dest ;

 TracePrint((state, "RDI_read: source=%.8lx dest=%p nbytes=%.8x\n",
             source, dest, *nbytes));

 for (i=0 ; i < *nbytes ; i++)
    *memptr++ = (char)ARMul_ReadByte(state,source++) ;
 if (state->abortSig) {
    state->abortSig = LOW ;
    return(RDIError_DataAbort) ;
    }
 return(RDIError_NoError) ;
 }

/***************************************************************************\
*                                  RDI_write                                *
\***************************************************************************/

static int RDI_write(const void *source, ARMword dest, unsigned *nbytes)
{unsigned i ;
 char *memptr = (char *)source ;

 TracePrint((state, "RDI_write: source=%p dest=%.8lx nbytes=%.8x\n",
            source, dest, *nbytes));

 for (i=0 ; i < *nbytes ; i++)
    ARMul_WriteByte(state,(ARMword)dest++,(ARMword)*memptr++) ;

 if (state->abortSig) {
    state->abortSig = LOW ;
    return(RDIError_DataAbort) ;
    }
 return(RDIError_NoError) ;
 }

/***************************************************************************\
*                                RDI_CPUread                                *
\***************************************************************************/

static int RDI_CPUread(unsigned mode, unsigned long mask, ARMword buffer[])
{unsigned i , upto ;

 if (mode == RDIMode_Curr)
    mode = (unsigned)(ARMul_GetCPSR(state) & MODEBITS) ;

 for (upto = 0, i = 0 ; i < 15 ; i++)
    if (mask & (1L << i)){
       buffer[upto++] = ARMul_GetReg(state,mode,i) ;
    }

 if (mask & RDIReg_R15) {
    buffer[upto++] = ARMul_GetR15(state) ;
 }

 if (mask & RDIReg_PC) {
    buffer[upto++] = ARMul_GetPC(state) ;
 }

 if (mask & RDIReg_CPSR)
    buffer[upto++] = ARMul_GetCPSR(state) ;

 if (mask & RDIReg_SPSR)
    buffer[upto++] = ARMul_GetSPSR(state,mode) ;

 TracePrint((state, "RDI_CPUread: mode=%.8x mask=%.8lx", mode, mask));
#ifdef RDI_VERBOSE
 if (rdi_log & 1) {
    for (upto = 0, i = 0 ; i <= 20 ; i++)
       if (mask & (1L << i)) {
          ARMul_DebugPrint(state, "%c%.8lx",upto%4==0?'\n':' ',buffer[upto]) ;
          upto++ ;
          }
    ARMul_DebugPrint(state, "\n") ;
    }
#endif

 return(RDIError_NoError) ;
}

/***************************************************************************\
*                               RDI_CPUwrite                                *
\***************************************************************************/

static int RDI_CPUwrite(unsigned mode, unsigned long mask, ARMword const buffer[])
{int i, upto;


 TracePrint((state, "RDI_CPUwrite: mode=%.8x mask=%.8lx", mode, mask));
#ifdef RDI_VERBOSE
 if (rdi_log & 1) {
    for (upto = 0, i = 0 ; i <= 20 ; i++)
       if (mask & (1L << i)) {
          ARMul_DebugPrint(state, "%c%.8lx",upto%4==0?'\n':' ',buffer[upto]) ;
          upto++ ;
          }
    ARMul_DebugPrint(state, "\n") ;
    }
#endif

 if (mode == RDIMode_Curr)
    mode = (unsigned)(ARMul_GetCPSR(state) & MODEBITS) ;

 for (upto = 0, i = 0 ; i < 15 ; i++)
    if (mask & (1L << i))
       ARMul_SetReg(state,mode,i,buffer[upto++]) ;

 if (mask & RDIReg_R15)
    ARMul_SetR15(state,buffer[upto++]) ;

 if (mask & RDIReg_PC) {

   ARMul_SetPC(state,buffer[upto++]) ;
 }
 if (mask & RDIReg_CPSR)
    ARMul_SetCPSR(state,buffer[upto++]) ;

 if (mask & RDIReg_SPSR)
    ARMul_SetSPSR(state,mode,buffer[upto++]) ;

 return(RDIError_NoError) ;
}

/***************************************************************************\
*                                RDI_CPread                                 *
\***************************************************************************/

static int RDI_CPread(unsigned CPnum, unsigned long mask, ARMword buffer[])
{ARMword fpregsaddr, word[4] ;
 
 unsigned r, w ;
 unsigned upto ;

 if (CPnum != 1 && CPnum != 2) {
    unsigned char const *rmap = state->CPRegWords[CPnum];
    if (rmap == NULL)
       return(RDIError_UnknownCoPro) ;
    for (upto = 0, r = 0 ; r < rmap[-1] ; r++)
       if (mask & (1L << r)) {
          (void)state->CPRead[CPnum](state, r, &buffer[upto]);
          upto += rmap[r];
       }
    TracePrint((state, "RDI_CPread: CPnum=%d mask=%.8lx", CPnum, mask));
#ifdef RDI_VERBOSE
    if (rdi_log & 1) {
       w = 0;
       for (upto = 0, r = 0; r < rmap[-1]; r++)
          if (mask & (1L << r)) {
             int words = rmap[r];
             ARMul_DebugPrint(state, "%c%2d", (w >= 4 ? (w = 0, '\n') : ' '), r);
             while (--words >= 0) {
                ARMul_DebugPrint(state, " %.8lx", buffer[upto++]);
                w++;
             }
          }
       ARMul_DebugPrint(state, "\n") ;
    }
#endif
    return RDIError_NoError;
 }

#ifdef NOFPE
 return RDIError_UnknownCoPro;

#else
 if (FPRegsAddr == 0) {
   fpregsaddr = ARMul_ReadWord(state, 4L) ;
   if ((fpregsaddr & 0xff800000) != 0xea000000) /* Must be a forward branch */
     return RDIError_UnknownCoPro;
   fpregsaddr = ((fpregsaddr & 0xffffff) << 2) + 8 ; /* address in __fp_decode - 4 */
   if ((fpregsaddr < FPESTART) || (fpregsaddr >= FPEEND))
     return RDIError_UnknownCoPro;
   fpregsaddr = ARMul_ReadWord(state, fpregsaddr) ; /* pointer to fp registers */
   FPRegsAddr = fpregsaddr ;
 }
 else
  fpregsaddr = FPRegsAddr ;

 if (fpregsaddr == 0) return RDIError_UnknownCoPro;
 for (upto = 0, r = 0 ; r < 8 ; r++)
    if (mask & (1L << r)) {
       for (w = 0 ; w < 4 ; w++)
          word[w] = ARMul_ReadWord(state,fpregsaddr + (ARMword)r * 16 + (ARMword)w * 4) ;
       switch ((int)(word[3] >> 29)) {
	 case 0 :
	 case 2 :
         case 4 :
         case 6 : /* its unpacked, convert to extended */
           buffer[upto++] = 2 ; /* mark as extended */
           buffer[upto++] = (word[3] & 0x7fff) | (word[0] & 0x80000000) ; /* exp and sign */
           buffer[upto++] = word[1] ; /* mantissa 1 */
           buffer[upto++] = word[2] ; /* mantissa 2 */
           break ;
         case 1 : /* packed single */
           buffer[upto++] = 0 ; /* mark as single */
           buffer[upto++] = word[0] ; /* sign, exp and mantissa */
           buffer[upto++] = word[1] ; /* padding */
           buffer[upto++] = word[2] ; /* padding */
           break ;
         case 3 : /* packed double */
           buffer[upto++] = 1 ; /* mark as double */
           buffer[upto++] = word[0] ; /* sign, exp and mantissa1 */
           buffer[upto++] = word[1] ; /* mantissa 2 */
           buffer[upto++] = word[2] ; /* padding */
           break ;
         case 5 : /* packed extended */
           buffer[upto++] = 2 ; /* mark as extended */
           buffer[upto++] = word[0] ; /* sign and exp */
           buffer[upto++] = word[1] ; /* mantissa 1 */
           buffer[upto++] = word[2] ; /* mantissa 2 */
           break ;
         case 7 : /* packed decimal */
           buffer[upto++] = 3 ; /* mark as packed decimal */
           buffer[upto++] = word[0] ; /* sign, exp and mantissa1 */
           buffer[upto++] = word[1] ; /* mantissa 2 */
           buffer[upto++] = word[2] ; /* mantissa 3 */
           break ;
         }
    }
 if (mask & (1L << r))
    buffer[upto++] = ARMul_ReadWord(state,fpregsaddr + 128) ; /* fpsr */
 if (mask & (1L << (r+1) ))
    buffer[upto++] = 0 ; /* fpcr */

 TracePrint((state, "RDI_CPread: CPnum=%d mask=%.8lx\n", CPnum, mask));
#ifdef RDI_VERBOSE
 if (rdi_log & 1) {
    for (upto = 0, r = 0 ; r < 9 ; r++)
       if (mask & (1L << r)) {
          if (r != 8) {
             ARMul_DebugPrint(state, "%08lx ",buffer[upto++]) ;
             ARMul_DebugPrint(state, "%08lx ",buffer[upto++]) ;
             ARMul_DebugPrint(state, "%08lx ",buffer[upto++]) ;
             }
          ARMul_DebugPrint(state, "%08lx\n",buffer[upto++]) ;
          }
    ARMul_DebugPrint(state, "\n") ;
    }
#endif
 return(RDIError_NoError) ;
#endif /* NOFPE */
 }

/***************************************************************************\
*                               RDI_CPwrite                                 *
\***************************************************************************/

static int RDI_CPwrite(unsigned CPnum, unsigned long mask, ARMword const buffer[])
{unsigned r ;
 unsigned upto ;
 ARMword fpregsaddr;

 if (CPnum != 1 && CPnum != 2) {
    unsigned char const *rmap = state->CPRegWords[CPnum];
    if (rmap == NULL)
       return(RDIError_UnknownCoPro) ;
    TracePrint((state, "RDI_CPwrite: CPnum=%d mask=%.8lx", CPnum, mask));
#ifdef RDI_VERBOSE
    if (rdi_log & 1) {
       int w = 0;
       for (upto = 0, r = 0; r < rmap[-1]; r++)
          if (mask & (1L << r)) {
             int words = rmap[r];
             ARMul_DebugPrint(state, "%c%2d", (w >= 4 ? (w = 0, '\n') : ' '), r);
             while (--words >= 0) {
                ARMul_DebugPrint(state, " %.8lx", buffer[upto++]);
                w++;
             }
          }
       ARMul_DebugPrint(state, "\n") ;
    }
#endif
    for (upto = 0, r = 0; r < rmap[-1]; r++)
       if (mask & (1L << r)) {
          (void)state->CPWrite[CPnum](state, r, &buffer[upto]);
          upto += rmap[r];
       }
    return RDIError_NoError;
 }

#ifdef NOFPE
 return RDIError_UnknownCoPro;

#else
 TracePrint((state, "RDI_CPwrite: CPnum=%d mask=%.8lx", CPnum, mask));
#ifdef RDI_VERBOSE
 if (rdi_log & 1) {
    for (upto = 0, r = 0 ; r < 9 ; r++)
       if (mask & (1L << r)) {
          if (r != 8) {
             ARMul_DebugPrint(state, "%08lx ",buffer[upto++]) ;
             ARMul_DebugPrint(state, "%08lx ",buffer[upto++]) ;
             ARMul_DebugPrint(state, "%08lx ",buffer[upto++]) ;
             }
          ARMul_DebugPrint(state, "%08lx\n",buffer[upto++]) ;
          }
   ARMul_DebugPrint(state, "\n") ;
   }
#endif

 if (FPRegsAddr == 0) {
   fpregsaddr = ARMul_ReadWord(state, 4L) ;
   if ((fpregsaddr & 0xff800000) != 0xea000000) /* Must be a forward branch */
     return RDIError_UnknownCoPro;
   fpregsaddr = ((fpregsaddr & 0xffffff) << 2) + 8 ; /* address in __fp_decode - 4 */
   if ((fpregsaddr < FPESTART) || (fpregsaddr >= FPEEND))
     return RDIError_UnknownCoPro;
   fpregsaddr = ARMul_ReadWord(state, fpregsaddr) ; /* pointer to fp registers */
   FPRegsAddr = fpregsaddr ;
 }
 else
  fpregsaddr = FPRegsAddr ;

 if (fpregsaddr == 0) return RDIError_UnknownCoPro;
 for (upto = 0, r = 0 ; r < 8 ; r++)
    if (mask & (1L << r)) {
      ARMul_WriteWord(state,fpregsaddr + (ARMword)r * 16,buffer[upto+1]) ;
      ARMul_WriteWord(state,fpregsaddr + (ARMword)r * 16 + 4,buffer[upto+2]) ;
      ARMul_WriteWord(state,fpregsaddr + (ARMword)r * 16 + 8,buffer[upto+3]) ;
      ARMul_WriteWord(state,fpregsaddr + (ARMword)r * 16 + 12,(buffer[upto] * 2 + 1) << 29) ; /* mark type */
      upto += 4 ;
    }
 if (mask & (1L << r))
    ARMul_WriteWord(state,fpregsaddr + 128,buffer[upto++]) ; /* fpsr */
 return(RDIError_NoError) ;
#endif /* NOFPE */
}

static void deletebreaknode(BreakNode **prevp) {
  BreakNode *p = *prevp;
  *prevp = p->next;
  ARMul_WriteWord(state, p->address, p->inst);
  free((char *)p);
  BreaksSet-- ;
  state->CallDebug-- ;
}

static int removebreak(ARMword address, unsigned type)
{ BreakNode *p, **prevp = &BreakList;
  for (; (p = *prevp) != NULL ; prevp = &p->next)
    if (p->address == address && p->type == type) {
      deletebreaknode(prevp);
      return TRUE;
    }
  return FALSE;
}

/* This routine installs a breakpoint into the breakpoint table */

static BreakNode *installbreak(ARMword address, unsigned type, ARMword bound)
{ BreakNode *p = (BreakNode *)malloc(sizeof(BreakNode));
  p->next = BreakList;
  BreakList = p;
  p->address = address;
  p->type = type;
  p->bound = bound;
  p->inst = ARMul_ReadWord(state, address);
  ARMul_WriteWord(state, address, 0xee000000L);
  return p;
}

/***************************************************************************\
*                               RDI_setbreak                                *
\***************************************************************************/

static int RDI_setbreak(ARMword address, unsigned type, ARMword bound,
                        PointHandle *handle)
{ BreakNode *p;
  TracePrint((state, "RDI_setbreak: address=%.8lx type=%d bound=%.8lx\n",
             address, type, bound));

  removebreak(address, type);
  p = installbreak(address, type, bound);
  BreaksSet++ ;
  state->CallDebug++ ;
  *handle = (PointHandle)p;
  TracePrint((state, " returns %.8lx\n", *handle));
  return RDIError_NoError;
}

/***************************************************************************\
*                               RDI_clearbreak                              *
\***************************************************************************/

static int RDI_clearbreak(PointHandle handle)
{ TracePrint((state, "RDI_clearbreak: address=%.8lx\n", handle));
  { BreakNode *p, **prevp = &BreakList;
    for (; (p = *prevp) != NULL; prevp = &p->next)
      if (p == (BreakNode *)handle) break;
    if (p == NULL) return RDIError_NoSuchPoint;
    deletebreaknode(prevp);
    return RDIError_NoError;
  }
}

/***************************************************************************\
*            Internal functions for breakpoint table manipulation           *
\***************************************************************************/

static void deletewatchnode(WatchNode **prevp)
{ WatchNode *p = *prevp;
  if (p->datatype & Watch_AnyRead) state->MemReadDebug--;
  if (p->datatype & Watch_AnyWrite) state->MemWriteDebug--;
  *prevp = p->next;
  free((char *)p);
}

int removewatch(ARMword address, unsigned type)
{ WatchNode *p, **prevp = &WatchList;
  for (; (p = *prevp) != NULL ; prevp = &p->next)
    if (p->address == address && p->type == type) { /* found a match */
       deletewatchnode(prevp);
       return TRUE;
    }
  return FALSE; /* never found a match */
}

static WatchNode *installwatch(ARMword address, unsigned type, unsigned datatype,
                               ARMword bound)
{ WatchNode *p = (WatchNode *)malloc(sizeof(WatchNode));
  p->next = WatchList;
  WatchList = p;
  p->address = address;
  p->type = type;
  p->datatype = datatype;
  p->bound = bound;
  return p;
}

/***************************************************************************\
*                               RDI_setwatch                                *
\***************************************************************************/

static int RDI_setwatch(ARMword address, unsigned type, unsigned datatype,
                        ARMword bound, PointHandle *handle)
{ WatchNode *p;
  TracePrint((state, "RDI_setwatch: address=%.8lx type=%d datatype=%d bound=%.8lx",
              address, type, datatype, bound));

  if (!state->CanWatch) return RDIError_UnimplementedMessage;

  removewatch(address, type);
  p = installwatch(address, type, datatype, bound);
  if (datatype & Watch_AnyRead) state->MemReadDebug++;
  if (datatype & Watch_AnyWrite) state->MemWriteDebug++;
  *handle = (PointHandle)p;
  TracePrint((state, " returns %.8lx\n", *handle));
  return RDIError_NoError;
}

/***************************************************************************\
*                               RDI_clearwatch                              *
\***************************************************************************/

static int RDI_clearwatch(PointHandle handle)
{ TracePrint((state, "RDI_clearwatch: address=%.8lx\n", handle));
  { WatchNode *p, **prevp = &WatchList;
    for (; (p = *prevp) != NULL; prevp = &p->next)
      if (p == (WatchNode *)handle) break;
    if (p == NULL) return RDIError_NoSuchPoint;
    deletewatchnode(prevp);
    return RDIError_NoError;
  }
}

/***************************************************************************\
*                               RDI_execute                                 *
\***************************************************************************/

static int RDI_execute(PointHandle *handle)
{
  TracePrint((state, "RDI_execute\n"));
  if (rdi_log & 4) {
    state->CallDebug++ ;
    state->Debug = TRUE ;
  }
  state->EndCondition = RDIError_NoError ;
  state->StopHandle = 0;

  ARMul_DoProg(state);

  *handle = state->StopHandle;
  state->Reg[15] -= 8 ; /* undo the pipeline */
  if (rdi_log & 4) {
    state->CallDebug-- ;
    state->Debug = FALSE ;
  }
  return(state->EndCondition) ;
}

/***************************************************************************\
*                                RDI_step                                   *
\***************************************************************************/

static int RDI_step(unsigned ninstr, PointHandle *handle)
{

  TracePrint((state, "RDI_step\n"));
  if (ninstr != 1) return RDIError_UnimplementedMessage;
  if (rdi_log & 4) {
    state->CallDebug++ ;
    state->Debug = TRUE ;
  }
  state->EndCondition = RDIError_NoError ;
  state->StopHandle = 0;
  ARMul_DoInstr(state) ;
  *handle = state->StopHandle;
  state->Reg[15] -= 8 ; /* undo the pipeline */
  if (rdi_log & 4) {
    state->CallDebug-- ;
    state->Debug = FALSE ;
  }
  return(state->EndCondition) ;
}

/***************************************************************************\
*                               RDI_info                                    *
\***************************************************************************/

static int RDI_info(unsigned type, ARMword *arg1, ARMword *arg2)
{
  switch (type) {
  case RDIInfo_Target:
    TracePrint((state, "RDI_Info_Target\n"));
    /* Emulator, speed 10**5 IPS */
    *arg1 = 5 | HIGHEST_RDI_LEVEL << 5 | LOWEST_RDI_LEVEL << 8;
    *arg2 = 1298224434;
    return RDIError_NoError;

  case RDIInfo_Points:
  { ARMword n = RDIPointCapability_Comparison | RDIPointCapability_Range |
                RDIPointCapability_Mask | RDIPointCapability_Status;
    TracePrint((state, "RDI_Info_Points\n"));
    if (state->CanWatch) n |= (Watch_AnyRead+Watch_AnyWrite) << 2;
    *arg1 = n;
    return RDIError_NoError;
  }

  case RDIInfo_Step:
    TracePrint((state, "RDI_Info_Step\n"));
    *arg1 =  RDIStep_Single;
    return RDIError_NoError;

  case RDIInfo_MMU:
    TracePrint((state, "RDI_Info_MMU\n"));
    *arg1 = 1313820229 ;
    return RDIError_NoError;

  case RDISignal_Stop:
    TracePrint((state, "RDISignal_Stop\n"));
    state->CallDebug++ ;
    state->EndCondition = RDIError_UserInterrupt ;
    return RDIError_NoError;

  case RDIVector_Catch:
    TracePrint((state, "RDIVector_Catch %.8lx\n", *arg1));
    state->VectorCatch = (unsigned)*arg1 ;
    return RDIError_NoError;

  case RDISet_Cmdline:
    TracePrint((state, "RDI_Set_Cmdline %s\n", (char *)arg1));
    state->CommandLine = (char *)malloc((unsigned)strlen((char *)arg1)+1) ;
    (void)strcpy(state->CommandLine,(char *)arg1) ;
    return RDIError_NoError;

  case RDICycles:
    TracePrint((state, "RDI_Info_Cycles\n"));
    arg1[0] = 0;
    arg1[1] = state->NumInstrs;
    arg1[2] = 0;
    arg1[3] = state->NumScycles;
    arg1[4] = 0;
    arg1[5] = state->NumNcycles;
    arg1[6] = 0;
    arg1[7] = state->NumIcycles;
    arg1[8] = 0;
    arg1[9] = state->NumCcycles;
    arg1[10] = 0;
    arg1[11] = state->NumFcycles;
    return RDIError_NoError;

  case RDIErrorP:
    *arg1 = ARMul_OSLastErrorP(state);
    TracePrint((state, "RDI_ErrorP returns %ld\n", *arg1));
    return RDIError_NoError;

  case RDIInfo_DescribeCoPro:
  { int cpnum = *(int *)arg1;
    struct Dbg_CoProDesc *cpd = (struct Dbg_CoProDesc *)arg2;
    int i;
    unsigned char const *map = state->CPRegWords[cpnum];
    if (map == NULL) return RDIError_UnknownCoPro;
    for (i = 0; i < cpd->entries; i++) {
      unsigned r, w = cpd->regdesc[i].nbytes / sizeof(ARMword);
      for (r = cpd->regdesc[i].rmin; r <= cpd->regdesc[i].rmax; r++)
        if (map[r] != w) return RDIError_BadCoProState;
    }
    return RDIError_NoError;
  }

  case RDIInfo_RequestCoProDesc:
  { int cpnum = *(int *)arg1;
    struct Dbg_CoProDesc *cpd = (struct Dbg_CoProDesc *)arg2;
    int i = -1, lastw = -1, r;
    unsigned char const *map;
    if ((unsigned)cpnum >= 16) return RDIError_UnknownCoPro;
    map = state->CPRegWords[cpnum];
    if (map == NULL) return RDIError_UnknownCoPro;
    for (r = 0; r < map[-1]; r++) {
      int words = map[r];
      if (words == lastw)
        cpd->regdesc[i].rmax = r;
      else {
        if (++i >= cpd->entries) return RDIError_BufferFull;
        cpd->regdesc[i].rmax = cpd->regdesc[i].rmin = r;
        cpd->regdesc[i].nbytes = words * sizeof(ARMword);
        cpd->regdesc[i].access = Dbg_Access_Readable+Dbg_Access_Writable;
      }
    }
    cpd->entries = i+1;
    return RDIError_NoError;
  }

  case RDIInfo_Log:
    *arg1 = (ARMword)rdi_log;
    return RDIError_NoError;

  case RDIInfo_SetLog:
    rdi_log = (int)*arg1;
    return RDIError_NoError;

  case RDIInfo_CoPro:
    return RDIError_NoError;

  case RDIPointStatus_Watch:
    { WatchNode *p, *handle = (WatchNode *)*arg1;
      for (p = WatchList; p != NULL; p = p->next)
        if (p == handle) {
          *arg1 = -1;
          *arg2 = 1;
          return RDIError_NoError;
        }
      return RDIError_NoSuchPoint;
    }

  case RDIPointStatus_Break:
    { BreakNode *p, *handle = (BreakNode *)*arg1;
      for (p = BreakList; p != NULL; p = p->next)
        if (p == handle) {
          *arg1 = -1;
          *arg2 = 1;
          return RDIError_NoError;
        }
      return RDIError_NoSuchPoint;
    }

  case RDISet_RDILevel:
    if (*arg1 < LOWEST_RDI_LEVEL || *arg1 > HIGHEST_RDI_LEVEL)
      return RDIError_IncompatibleRDILevels;
    MYrdi_level = *arg1;
    return RDIError_NoError;

  default:
    return RDIError_UnimplementedMessage;

  }
}

/***************************************************************************\
* The emulator calls this routine at the beginning of every cycle when the  *
* CallDebug flag is set.  The second parameter passed is the address of the *
* currently executing instruction (i.e Program Counter - 8), the third      *
* parameter is the instruction being executed.                              *
\***************************************************************************/

ARMword ARMul_Debug(ARMul_State *state, ARMword pc, ARMword instr)
{

  if (state->EndCondition == RDIError_UserInterrupt) {
    TracePrint((state, "User interrupt at %.8lx\n", pc));
    state->CallDebug--;
    state->Emulate = STOP;
  } else {
    BreakNode *p = BreakList;
    for (; p != NULL ; p = p->next) {
      switch (p->type) {
      case RDIPoint_EQ: if (pc == p->address) break; continue;
      case RDIPoint_GT: if (pc >  p->address) break; continue;
      case RDIPoint_GE: if (pc >= p->address) break; continue;
      case RDIPoint_LT: if (pc <  p->address) break; continue;
      case RDIPoint_LE: if (pc <= p->address) break; continue;
      case RDIPoint_IN: if (p->address <= pc && pc < p->address+p->bound) break;
                        continue;
      case RDIPoint_OUT:if (p->address > pc || pc >= p->address+p->bound) break;
                        continue;
      case RDIPoint_MASK:if ((pc & p->bound) == p->address) break; continue;
      }
      /* found a match */
      TracePrint((state, "Breakpoint reached at %.8lx\n", pc));
      state->EndCondition = RDIError_BreakpointReached ;
      state->Emulate = STOP;
      state->StopHandle = (ARMword)p;
      break;
    }
  }
  return instr;
}

void ARMul_CheckWatch(ARMul_State *state, ARMword addr, int access)
{ WatchNode *p;
  for (p = WatchList; p != NULL; p = p->next)
    if (p->datatype & access) {
      switch (p->type) {
      case RDIPoint_EQ: if (addr == p->address) break; continue;
      case RDIPoint_GT: if (addr >  p->address) break; continue;
      case RDIPoint_GE: if (addr >= p->address) break; continue;
      case RDIPoint_LT: if (addr <  p->address) break; continue;
      case RDIPoint_LE: if (addr <= p->address) break; continue;
      case RDIPoint_IN: if (p->address <= addr && addr < p->address+p->bound) break;
                        continue;
      case RDIPoint_OUT:if (p->address > addr || addr >= p->address+p->bound) break;
                        continue;
      case RDIPoint_MASK:if ((addr & p->bound) == p->address) break; continue;
      }
      /* found a match */
      TracePrint((state, "Watchpoint at %.8lx accessed\n", addr));
      state->EndCondition = RDIError_WatchpointAccessed;
      state->Emulate = STOP;
      state->StopHandle = (ARMword)p;
      return;
   }
}

static RDI_NameList const *RDI_cpunames() {
  return (RDI_NameList const *)&processorconfig.count;
}

const struct RDIProcVec armul_rdi = {
    "ARMUL",
    RDI_open,
    RDI_close,
    RDI_read,
    RDI_write,
    RDI_CPUread,
    RDI_CPUwrite,
    RDI_CPread,
    RDI_CPwrite,
    RDI_setbreak,
    RDI_clearbreak,
    RDI_setwatch,
    RDI_clearwatch,
    RDI_execute,
    RDI_step,
    RDI_info,

    0, /*pointinq*/
    0, /*addconfig*/
    0, /*loadconfigdata*/
    0, /*selectconfig*/
    0, /*drivernames*/

    RDI_cpunames
};