File content as of revision 0:fd0d7bdfcdc2:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2012 ARM Limited
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef MBED_SEMIHOST_H
#define MBED_SEMIHOST_H

#include "device.h"
#include "toolchain.h"

#ifdef __cplusplus
extern "C" {
#endif

/* __semihost intrinsic
 This intrinsic inserts an SVC or BKPT instruction into the instruction stream
 generated by the compiler. It enables you to make semihosting calls from C or
 C++ that are independent of the target architecture.
 */
#ifndef __CC_ARM
/* Semihost implementation taken from eLua (MIT license):
 *    git://github.com/elua/elua.git/src/semifs.c
 */

/* SWI numbers for RDI (Angel) monitors */
#ifdef __thumb__
#define AngelSWI            0xAB
#else
#define AngelSWI            0x123456
#endif
/* For Thumb-2 code use the BKPT instruction instead of SWI */
#ifdef __thumb2__
#define AngelSWIInsn        "bkpt"
#define AngelSWIAsm          bkpt
#else
#define AngelSWIInsn        "swi"
#define AngelSWIAsm          swi
#endif

inline int __semihost(int reason, const void *arg) {
    int value;
    asm volatile ("mov r0, %1; mov r1, %2; " AngelSWIInsn " %a3; mov %0, r0"
       : "=r" (value) /* Outputs */
       : "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */
       : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc"
                /* Clobbers r0 and r1, and lr if in supervisor mode */);
                /* Accordingly to page 13-77 of ARM DUI 0040D other registers
                   can also be clobbered.  Some memory positions may also be
                   changed by a system call, so they should not be kept in
                   registers. Note: we are assuming the manual is right and
                   Angel is respecting the APCS.  */
    
    return value;
}

#endif

#if DEVICE_LOCALFILESYSTEM
FILEHANDLE semihost_open(const char* name, int openmode);
int semihost_close (FILEHANDLE fh);
int semihost_read  (FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode);
int semihost_write (FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode);
int semihost_ensure(FILEHANDLE fh);
long semihost_flen (FILEHANDLE fh);
int semihost_seek  (FILEHANDLE fh, long position);
int semihost_istty (FILEHANDLE fh);

int semihost_remove(const char *name);
int semihost_rename(const char *old_name, const char *new_name);
#endif

int semihost_uid(char *uid);
int semihost_reset(void);
int semihost_vbus(void);
int semihost_powerdown(void);
int semihost_exit(void);

int semihost_connected(void);
int semihost_disabledebug(void);

#ifdef __cplusplus
}
#endif

#endif