Add support for RedBoot SWIs to ARM Simulator

[Nick Clifton <nickc@cambridge.redhat.com>]

Hi Guys,

  I am applying the patch below to add support for the SWI used by
  RedBoot to implement some of its system calls.  The patch only
  supports those system calls already supported by the simulator's
  Angel and Demon SWI protocol support.

  Note - it is not possible to support the RedBoot SWI in Thumb mode,
  since this SWI value - 0x18 - is also the thumb breakpoint value
  used by GDB.

Cheers
        Nick

2002-05-09  Nick Clifton  <nickc@cambridge.redhat.com>

	* armos.c (ARMul_OSHandleSWI): Support the RedBoot SWI in ARM
	mode and some of its system calls.

Index: sim/arm/armos.c
===================================================================
RCS file: /cvs/src/src/sim/arm/armos.c,v
retrieving revision 1.11
diff -c -3 -p -w -r1.11 armos.c
*** sim/arm/armos.c	21 Feb 2002 20:22:49 -0000	1.11
--- sim/arm/armos.c	9 May 2002 10:01:16 -0000
*************** ARMul_OSHandleSWI (ARMul_State * state, 
*** 635,640 ****
--- 635,703 ----
        /* These are used by the FPE code.  */
        break;
        
+     case 0x180001: /* RedBoot's Syscall SWI in ARM mode.  */
+       switch (state->Reg[0])
+ 	{
+ 	  /* These numbers are defined in libgloss/syscall.h
+ 	     but the simulator should not be dependend upon
+ 	     libgloss being installed.  */
+ 	case 1:  /* Exit.  */
+ 	  state->Emulate = FALSE;
+ 	  return TRUE;
+ 
+ 	case 2:  /* Open.  */
+ 	  SWIopen (state, state->Reg[1], state->Reg[2]);
+ 	  return TRUE;
+ 
+ 	case 3:  /* Close.  */
+ 	  state->Reg[0] = close (state->Reg[1]);
+ 	  OSptr->ErrorNo = errno;
+ 	  return TRUE;
+ 
+ 	case 4:  /* Read.  */
+ 	  SWIread (state, state->Reg[1], state->Reg[2], state->Reg[3]);
+ 	  return TRUE;
+ 
+ 	case 5:  /* Write.  */
+ 	  SWIwrite (state, state->Reg[1], state->Reg[2], state->Reg[3]);
+ 	  return TRUE;
+ 
+ 	case 6:  /* Lseek.  */
+ 	  state->Reg[0] = lseek (state->Reg[1], state->Reg[2], state->Reg[3]);
+ 	  OSptr->ErrorNo = errno;
+ 	  return TRUE;
+ 
+ 	case 17: /* Utime.  */
+ 	  state->Reg[0] = (ARMword) time (state->Reg[1]);
+ 	  OSptr->ErrorNo = errno;
+ 	  return (TRUE);
+ 
+ 	case 7:  /* Unlink.  */
+ 	case 8:  /* Getpid.  */
+ 	case 9:  /* Kill.  */
+ 	case 10: /* Fstat.  */
+ 	case 11: /* Sbrk.  */
+ 	case 12: /* Argvlen.  */
+ 	case 13: /* Argv.  */
+ 	case 14: /* ChDir.  */
+ 	case 15: /* Stat.  */
+ 	case 16: /* Chmod.  */
+ 	case 18: /* Time.  */
+ 	  sim_callback->printf_filtered
+ 	    (sim_callback,
+ 	     "sim: unhandled RedBoot syscall '%d' encountered - ignoring\n",
+ 	     state->Reg[0]);
+ 	  return FALSE;
+ 
+ 	default:
+ 	  sim_callback->printf_filtered
+ 	    (sim_callback,
+ 	     "sim: unknown RedBoot syscall '%d' encountered - ignoring\n",
+ 	     state->Reg[0]);
+ 	  return FALSE;
+ 	}
+       return TRUE;
+       
      default:
        /* If there is a SWI vector installed use it.  */
        if (state->is_XScale && saved_number != -1)