Diff: semihost_api.h

Revision:

8:c14af7958ef5

Child:

9:663789d7729f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/semihost_api.h	Fri Nov 09 11:33:53 2012 +0000
@@ -0,0 +1,84 @@
+/* mbed Microcontroller Library - semihost_api
+ * Copyright (c) 2006-2009 ARM Limited. All rights reserved.
+ */
+#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:
+ *    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