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/* libc.c -- dummy C library simulation

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

This file is part of OpenRISC 1000 Architectural Simulator.

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. */

/* Debugger LIBC functions. Working, but VERY, VERY ugly written.

I wrote following code when basic simulator started to work and I was

desperate to use some PRINTFs in my debugged code. And it was

also used to get some output from Dhrystone MIPS benchmark. */

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <stdarg.h>

#include <stdlib.h>

#include "abstract.h"

#include "arch.h"

#include "sim-config.h"

#include "debug.h"

/* Length of PRINTF format string */

#define FMTLEN 2000

char fmtstr[FMTLEN];

char *simgetstr(unsigned long stackaddr, unsigned long regparam)

{

  unsigned long fmtaddr;

  int i;

  int breakpoint = 0;

  fmtaddr = regparam;

  i = 0;

  while (eval_mem8(fmtaddr,&breakpoint) != '\0') {

    fmtstr[i++] = eval_mem8(fmtaddr,&breakpoint);

    fmtaddr++;

    if (i == FMTLEN - 1)

      break;

  }

  fmtstr[i] = '\0';

  return fmtstr;

}

void simprintf(unsigned long stackaddr, unsigned long regparam)

{

  FILE *f;

  int breakpoint = 0;

  simgetstr(stackaddr, regparam);

  debug(6, "simprintf: stackaddr: 0x%.8lx\n", stackaddr);

  if ((f = fopen(config.sim.fstdout, "a+"))) {

    unsigned long arg;

    unsigned long argaddr;

    char *fmtstrend;

    char *fmtstrpart = fmtstr;

    int tee_exe_log;

#if STACK_ARGS

    argaddr = stackaddr;

#else

    argaddr = 3;

#endif

    tee_exe_log = (config.sim.exe_log && (config.sim.exe_log_type == EXE_LOG_SOFTWARE || config.sim.exe_log_type == EXE_LOG_SIMPLE)

       && config.sim.exe_log_start <= runtime.cpu.instructions && (config.sim.exe_log_end <= 0 || runtime.cpu.instructions <= config.sim.exe_log_end));

    if (tee_exe_log) fprintf (runtime.sim.fexe_log, "SIMPRINTF: ");

    debug(6, "simprintf: %s\n", fmtstrpart);

    while(strlen(fmtstrpart)) {

      debug(6, "simprintf(): 1");

      if ((fmtstrend = strstr(fmtstrpart + 1, "%")))

        *fmtstrend = '\0';

      debug(6," 2");

      if (strstr(fmtstrpart, "%")) {

        char *tmp;

        int string = 0;

        debug(6, " 3");

#if STACK_ARGS

        arg = eval_mem32(argaddr,&breakpoint);

        argaddr += 4;

#else

        sprintf(regstr, "r%u", ++argaddr);

        arg = evalsim_reg32(atoi(regstr));

#endif

        debug(6, " 4: fmtstrpart=%p fmtstrpart=%s arg=%p\n", fmtstrpart, fmtstrpart, arg);

        tmp = fmtstrpart;

        if (*tmp == '%') {

          tmp++;

          while (*tmp == '-' || *tmp >= '0' && *tmp <= '9') tmp++;

          if (*tmp == 's') string = 1;

        }

        if (string) {

          int len = 0;

          char *str;

          for(; eval_mem8(arg++,&breakpoint); len++);

          len++;  /* for null char */

          arg -= len;

          str = (char *)malloc(len);

          len = 0;

          for(; eval_mem8(arg,&breakpoint); len++)

            *(str+len) = eval_mem8(arg++,&breakpoint);

          *(str+len) = eval_mem8(arg,&breakpoint); /* null ch */

          debug(6, "4a: len=%d str=%s\n", len, str);

          debug(6, "4b:");

          fprintf(f, fmtstrpart, str);

          if (tee_exe_log) fprintf(runtime.sim.fexe_log, fmtstrpart, str);

          free(str);

        } else {

          fprintf(f, fmtstrpart, arg);

          if (tee_exe_log) fprintf(runtime.sim.fexe_log, fmtstrpart, arg);

        }

      } else {

        debug(6, " 5");

        fprintf(f, fmtstrpart);

        if (tee_exe_log) fprintf(runtime.sim.fexe_log, fmtstrpart);

        debug(6, fmtstrpart);

      }

      if (!fmtstrend)

        break;

      debug(6, " 6");

      fmtstrpart = fmtstrend;

      *fmtstrpart = '%';

      debug(6, " 7");

    }

    debug(6," 8\n");

    if (fclose(f))

      perror(strerror(errno));

  }

  else

    perror(strerror(errno));

}