sim/arm RedBoot meminfo syscall [PATCH]

[Daniel Jacobowitz]

On Wed, Dec 14, 2005 at 11:40:28AM -0700, Shaun Jackman wrote:
> This patch implements the RedBoot meminfo syscall. In addition, rather
> than ignoring unhandled syscalls, it sets errno to ENOSYS and returns
> -1. This makes it possible to run "Hello, world!" compiled using
> newlib and a RedBoot libgloss.
> 
> Cheers,
> Shaun
> 
> 2005-12-14  Shaun Jackman  <sjackman@gmail.com>
> 
> 	* sim/arm/armos.c (ARMul_OSHandleSWI): Handle the RedBoot system
> 	call meminfo. Return ENOSYS for unhandled RedBoot syscalls.

This looks totally plausible to me but I don't know much about it;
Richard, any opinion on it before I approve it?

> 
> Index: armos.c
> ===================================================================
> RCS file: /cvs/src/src/sim/arm/armos.c,v
> retrieving revision 1.23
> diff -u -r1.23 armos.c
> --- armos.c	17 Nov 2005 04:23:03 -0000	1.23
> +++ armos.c	14 Dec 2005 18:36:19 -0000
> @@ -859,9 +859,26 @@
>   	    case 18: /* Time.  */
>  	      sim_callback->printf_filtered
>  		(sim_callback,
> -		 "sim: unhandled RedBoot syscall '%d' encountered - ignoring\n",
> +		 "sim: unhandled RedBoot syscall `%d' encountered - "
> +		 "returning ENOSYS\n",
>   		 state->Reg[0]);
> -	      return FALSE;
> +	      state->Reg[0] = -1;
> +	      OSptr->ErrorNo = cb_host_to_target_errno
> +		(sim_callback, ENOSYS);
> +	      break;
> +	    case 1001: /* Meminfo. */
> +	      {
> +		ARMword totmem = state->Reg[1],
> +			topmem = state->Reg[2];
> +		ARMword stack = state->MemSize > 0
> +		  ? state->MemSize : ADDRUSERSTACK;
> +		if (totmem != 0)
> +		  ARMul_WriteWord (state, totmem, stack);
> +		if (topmem != 0)
> +		  ARMul_WriteWord (state, topmem, stack);
> +		state->Reg[0] = 0;
> +		break;
> +	      }
> 
>   	    default:
>  	      sim_callback->printf_filtered
> 

-- 
Daniel Jacobowitz
CodeSourcery