Semihosted file handles for targets without DEVICE_SEMIHOST or DEVICE_LOCALFILESYSTEM
Diff: mbed_semihost_api_shim.c
- Revision:
- 0:d5e731da01f0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed_semihost_api_shim.c Wed Oct 11 23:14:14 2017 +0000 @@ -0,0 +1,101 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "cmsis.h" +#include "mbed_semihost_api_shim.h" + +#include <stdint.h> +#include <string.h> + +// ARM Semihosting Commands +#define SYS_OPEN (0x1) +#define SYS_CLOSE (0x2) +#define SYS_WRITE (0x5) +#define SYS_READ (0x6) +#define SYS_ISTTY (0x9) +#define SYS_SEEK (0xa) +#define SYS_ENSURE (0xb) +#define SYS_FLEN (0xc) +#define SYS_REMOVE (0xe) +#define SYS_RENAME (0xf) +#define SYS_EXIT (0x18) + +#if !DEVICE_LOCALFILESYSTEM +FILEHANDLE semihost_open(const char* name, int openmode) { + uint32_t args[3]; + args[0] = (uint32_t)name; + args[1] = (uint32_t)openmode; + args[2] = (uint32_t)strlen(name); + return __semihost(SYS_OPEN, args); +} + +int semihost_close(FILEHANDLE fh) { + return __semihost(SYS_CLOSE, &fh); +} + +int semihost_write(FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode) { + if (length == 0) return 0; + + uint32_t args[3]; + args[0] = (uint32_t)fh; + args[1] = (uint32_t)buffer; + args[2] = (uint32_t)length; + return __semihost(SYS_WRITE, args); +} + +int semihost_read(FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode) { + uint32_t args[3]; + args[0] = (uint32_t)fh; + args[1] = (uint32_t)buffer; + args[2] = (uint32_t)length; + return __semihost(SYS_READ, args); +} + +int semihost_istty(FILEHANDLE fh) { + return __semihost(SYS_ISTTY, &fh); +} + +int semihost_seek(FILEHANDLE fh, long position) { + uint32_t args[2]; + args[0] = (uint32_t)fh; + args[1] = (uint32_t)position; + return __semihost(SYS_SEEK, args); +} + +int semihost_ensure(FILEHANDLE fh) { + return __semihost(SYS_ENSURE, &fh); +} + +long semihost_flen(FILEHANDLE fh) { + return __semihost(SYS_FLEN, &fh); +} + +int semihost_remove(const char *name) { + uint32_t args[2]; + args[0] = (uint32_t)name; + args[1] = (uint32_t)strlen(name); + return __semihost(SYS_REMOVE, args); +} + +int semihost_rename(const char *old_name, const char *new_name) { + uint32_t args[4]; + args[0] = (uint32_t)old_name; + args[1] = (uint32_t)strlen(old_name); + args[0] = (uint32_t)new_name; + args[1] = (uint32_t)strlen(new_name); + return __semihost(SYS_RENAME, args); +} + +#endif