Diff: capi/semihost_api.h

Revision:

0:fd0d7bdfcdc2

Child:

2:143cac498751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/capi/semihost_api.h	Tue Nov 20 17:24:08 2012 +0000
@@ -0,0 +1,102 @@
+/* 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