Add Corstone-300 target
Change-Id: I34e9845abdccb3363953bd70fad7c6420865291e
diff --git a/targets/corstone-300/retarget.c b/targets/corstone-300/retarget.c
new file mode 100644
index 0000000..1598427
--- /dev/null
+++ b/targets/corstone-300/retarget.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2019-2020 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "uart.h"
+
+// armclang retargeting
+#if defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 6100100)
+#include <rt_misc.h>
+#include <rt_sys.h>
+
+/* Standard IO device handles. */
+#define STDIN 0x8001
+#define STDOUT 0x8002
+#define STDERR 0x8003
+
+#define RETARGET(fun) _sys##fun
+
+#else
+/*
+ * This type is used by the _ I/O functions to denote an open
+ * file.
+ */
+typedef int FILEHANDLE;
+
+/*
+ * Open a file. May return -1 if the file failed to open.
+ */
+extern FILEHANDLE _open(const char * /*name*/, int /*openmode*/);
+
+/* Standard IO device handles. */
+#define STDIN 0x00
+#define STDOUT 0x01
+#define STDERR 0x02
+
+#define RETARGET(fun) fun
+
+#endif
+
+/* Standard IO device name defines. */
+const char __stdin_name[] __attribute__((aligned(4))) = "STDIN";
+const char __stdout_name[] __attribute__((aligned(4))) = "STDOUT";
+const char __stderr_name[] __attribute__((aligned(4))) = "STDERR";
+
+void _ttywrch(int ch) {
+ (void)fputc(ch, stdout);
+}
+
+FILEHANDLE RETARGET(_open)(const char *name, int openmode) {
+ (void)openmode;
+
+ if (strcmp(name, __stdin_name) == 0) {
+ return (STDIN);
+ }
+
+ if (strcmp(name, __stdout_name) == 0) {
+ return (STDOUT);
+ }
+
+ if (strcmp(name, __stderr_name) == 0) {
+ return (STDERR);
+ }
+
+ return -1;
+}
+
+int RETARGET(_write)(FILEHANDLE fh, const unsigned char *buf, unsigned int len, int mode) {
+ (void)mode;
+
+ switch (fh) {
+ case STDOUT:
+ case STDERR: {
+ int c;
+
+ while (len-- > 0) {
+ c = fputc(*buf++, stdout);
+ if (c == EOF) {
+ return EOF;
+ }
+ }
+
+ return 0;
+ }
+ default:
+ return EOF;
+ }
+}
+
+int RETARGET(_read)(FILEHANDLE fh, unsigned char *buf, unsigned int len, int mode) {
+ (void)mode;
+
+ switch (fh) {
+ case STDIN: {
+ int c;
+
+ while (len-- > 0) {
+ c = fgetc(stdin);
+ if (c == EOF) {
+ return EOF;
+ }
+
+ *buf++ = (unsigned char)c;
+ }
+
+ return 0;
+ }
+ default:
+ return EOF;
+ }
+}
+
+int RETARGET(_istty)(FILEHANDLE fh) {
+ switch (fh) {
+ case STDIN:
+ case STDOUT:
+ case STDERR:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+int RETARGET(_close)(FILEHANDLE fh) {
+ if (RETARGET(_istty(fh))) {
+ return 0;
+ }
+
+ return -1;
+}
+
+int RETARGET(_seek)(FILEHANDLE fh, long pos) {
+ (void)fh;
+ (void)pos;
+
+ return -1;
+}
+
+int RETARGET(_ensure)(FILEHANDLE fh) {
+ (void)fh;
+
+ return -1;
+}
+
+long RETARGET(_flen)(FILEHANDLE fh) {
+ if (RETARGET(_istty)(fh)) {
+ return 0;
+ }
+
+ return -1;
+}
+
+int RETARGET(_tmpnam)(char *name, int sig, unsigned maxlen) {
+ (void)name;
+ (void)sig;
+ (void)maxlen;
+
+ return 1;
+}
+
+char *RETARGET(_command_string)(char *cmd, int len) {
+ (void)len;
+
+ return cmd;
+}
+
+void RETARGET(_exit)(int return_code) {
+ exit(return_code);
+}
+
+int system(const char *cmd) {
+ (void)cmd;
+
+ return 0;
+}
+
+time_t time(time_t *timer) {
+ time_t current;
+
+ current = 0; // To Do !! No RTC implemented
+
+ if (timer != NULL) {
+ *timer = current;
+ }
+
+ return current;
+}
+
+void _clock_init(void) {
+#if 0
+ // Example implementation based on SysTick
+ // For instance, use a counting var in a SysTick interrupt handler
+ // for clock() to use
+ SysTick->LOAD = (uint32_t) ((SystemCoreClock/100)-1UL);
+ NVIC_SetPriority (SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL);
+ SysTick->VAL = 0UL;
+ SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk;
+#endif
+}
+
+clock_t clock(void) {
+ return (clock_t)-1;
+}
+
+int remove(const char *arg) {
+ (void)arg;
+ return 0;
+}
+
+int rename(const char *oldn, const char *newn) {
+ (void)oldn;
+ (void)newn;
+ return 0;
+}
+
+void exit(int code) {
+ uart_putc((char)0x4);
+ uart_putc((char)code);
+ while (1) {}
+}
+
+int fputc(int ch, FILE *f) {
+ (void)(f);
+ return uart_putc(ch);
+}
+
+int fgetc(FILE *f) {
+ (void)f;
+ return uart_putc(uart_getc());
+}
+
+#ifndef ferror
+/* arm-none-eabi-gcc with newlib uses a define for ferror */
+int ferror(FILE *f) {
+ (void)f;
+ return EOF;
+}
+#endif