Julien Kern / mbed

mbed library

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semihost_api.h@54:71b101360fb9, 2013-01-08 (annotated)

Committer:
emilmont
Date:
Tue Jan 08 12:46:36 2013 +0000
Revision:
54:71b101360fb9
Parent:
44:24d45a770a51
Child:
55:d722ed6a4237
Support "stream as file" use case

Unify binary libraries

Update copyright

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 44:24d45a770a51 1 /* mbed Microcontroller Library
emilmont 54:71b101360fb9 2 * Copyright (c) 2006-2013 ARM Limited
emilmont 44:24d45a770a51 3 *
emilmont 44:24d45a770a51 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
emilmont 44:24d45a770a51 5 * of this software and associated documentation files (the "Software"), to deal
emilmont 44:24d45a770a51 6 * in the Software without restriction, including without limitation the rights
emilmont 44:24d45a770a51 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
emilmont 44:24d45a770a51 8 * copies of the Software, and to permit persons to whom the Software is
emilmont 44:24d45a770a51 9 * furnished to do so, subject to the following conditions:
emilmont 44:24d45a770a51 10 *
emilmont 44:24d45a770a51 11 * The above copyright notice and this permission notice shall be included in
emilmont 44:24d45a770a51 12 * all copies or substantial portions of the Software.
emilmont 44:24d45a770a51 13 *
emilmont 44:24d45a770a51 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
emilmont 44:24d45a770a51 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
emilmont 44:24d45a770a51 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
emilmont 44:24d45a770a51 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
emilmont 44:24d45a770a51 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
emilmont 44:24d45a770a51 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
emilmont 44:24d45a770a51 20 * SOFTWARE.
emilmont 44:24d45a770a51 21 */
emilmont 44:24d45a770a51 22 #ifndef MBED_SEMIHOST_H
emilmont 44:24d45a770a51 23 #define MBED_SEMIHOST_H
emilmont 44:24d45a770a51 24
emilmont 44:24d45a770a51 25 #include "device.h"
emilmont 44:24d45a770a51 26 #include "toolchain.h"
emilmont 44:24d45a770a51 27
emilmont 44:24d45a770a51 28 #ifdef __cplusplus
emilmont 44:24d45a770a51 29 extern "C" {
emilmont 44:24d45a770a51 30 #endif
emilmont 44:24d45a770a51 31
emilmont 44:24d45a770a51 32 /* __semihost intrinsic
emilmont 44:24d45a770a51 33 This intrinsic inserts an SVC or BKPT instruction into the instruction stream
emilmont 44:24d45a770a51 34 generated by the compiler. It enables you to make semihosting calls from C or
emilmont 44:24d45a770a51 35 C++ that are independent of the target architecture.
emilmont 44:24d45a770a51 36 */
emilmont 44:24d45a770a51 37 #ifndef __CC_ARM
emilmont 44:24d45a770a51 38 /* Semihost implementation taken from eLua (MIT license):
emilmont 44:24d45a770a51 39 * git://github.com/elua/elua.git/src/semifs.c
emilmont 44:24d45a770a51 40 */
emilmont 44:24d45a770a51 41
emilmont 44:24d45a770a51 42 /* SWI numbers for RDI (Angel) monitors */
emilmont 44:24d45a770a51 43 #ifdef __thumb__
emilmont 44:24d45a770a51 44 #define AngelSWI 0xAB
emilmont 44:24d45a770a51 45 #else
emilmont 44:24d45a770a51 46 #define AngelSWI 0x123456
emilmont 44:24d45a770a51 47 #endif
emilmont 44:24d45a770a51 48 /* For Thumb-2 code use the BKPT instruction instead of SWI */
emilmont 44:24d45a770a51 49 #ifdef __thumb2__
emilmont 44:24d45a770a51 50 #define AngelSWIInsn "bkpt"
emilmont 44:24d45a770a51 51 #define AngelSWIAsm bkpt
emilmont 44:24d45a770a51 52 #else
emilmont 44:24d45a770a51 53 #define AngelSWIInsn "swi"
emilmont 44:24d45a770a51 54 #define AngelSWIAsm swi
emilmont 44:24d45a770a51 55 #endif
emilmont 44:24d45a770a51 56
emilmont 44:24d45a770a51 57 inline int __semihost(int reason, const void *arg) {
emilmont 44:24d45a770a51 58 int value;
emilmont 44:24d45a770a51 59 asm volatile ("mov r0, %1; mov r1, %2; " AngelSWIInsn " %a3; mov %0, r0"
emilmont 44:24d45a770a51 60 : "=r" (value) /* Outputs */
emilmont 44:24d45a770a51 61 : "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */
emilmont 44:24d45a770a51 62 : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc"
emilmont 44:24d45a770a51 63 /* Clobbers r0 and r1, and lr if in supervisor mode */);
emilmont 44:24d45a770a51 64 /* Accordingly to page 13-77 of ARM DUI 0040D other registers
emilmont 44:24d45a770a51 65 can also be clobbered. Some memory positions may also be
emilmont 44:24d45a770a51 66 changed by a system call, so they should not be kept in
emilmont 44:24d45a770a51 67 registers. Note: we are assuming the manual is right and
emilmont 44:24d45a770a51 68 Angel is respecting the APCS. */
emilmont 44:24d45a770a51 69
emilmont 44:24d45a770a51 70 return value;
emilmont 44:24d45a770a51 71 }
emilmont 44:24d45a770a51 72
emilmont 44:24d45a770a51 73 #endif
emilmont 44:24d45a770a51 74
emilmont 44:24d45a770a51 75 #if DEVICE_LOCALFILESYSTEM
emilmont 44:24d45a770a51 76 FILEHANDLE semihost_open(const char* name, int openmode);
emilmont 44:24d45a770a51 77 int semihost_close (FILEHANDLE fh);
emilmont 44:24d45a770a51 78 int semihost_read (FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode);
emilmont 44:24d45a770a51 79 int semihost_write (FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode);
emilmont 44:24d45a770a51 80 int semihost_ensure(FILEHANDLE fh);
emilmont 44:24d45a770a51 81 long semihost_flen (FILEHANDLE fh);
emilmont 44:24d45a770a51 82 int semihost_seek (FILEHANDLE fh, long position);
emilmont 44:24d45a770a51 83 int semihost_istty (FILEHANDLE fh);
emilmont 44:24d45a770a51 84
emilmont 44:24d45a770a51 85 int semihost_remove(const char *name);
emilmont 44:24d45a770a51 86 int semihost_rename(const char *old_name, const char *new_name);
emilmont 44:24d45a770a51 87 #endif
emilmont 44:24d45a770a51 88
emilmont 44:24d45a770a51 89 int semihost_uid(char *uid);
emilmont 44:24d45a770a51 90 int semihost_reset(void);
emilmont 44:24d45a770a51 91 int semihost_vbus(void);
emilmont 44:24d45a770a51 92 int semihost_powerdown(void);
emilmont 44:24d45a770a51 93 int semihost_exit(void);
emilmont 44:24d45a770a51 94
emilmont 44:24d45a770a51 95 int semihost_connected(void);
emilmont 44:24d45a770a51 96 int semihost_disabledebug(void);
emilmont 44:24d45a770a51 97
emilmont 44:24d45a770a51 98 #ifdef __cplusplus
emilmont 44:24d45a770a51 99 }
emilmont 44:24d45a770a51 100 #endif
emilmont 44:24d45a770a51 101
emilmont 44:24d45a770a51 102 #endif