flash/nor: Add support for TI CC26xx/CC13xx flash

[openocd] / contrib / loaders / flash / cc26xx / startup.c

diff --git a/contrib/loaders/flash/cc26xx/startup.c b/contrib/loaders/flash/cc26xx/startup.c
new file mode 100644 (file)
index 0000000..70fd836
--- /dev/null
+++ b/contrib/loaders/flash/cc26xx/startup.c
@@ -0,0 +1,97 @@
+/******************************************************************************
+*
+* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+*  Redistributions of source code must retain the above copyright
+*  notice, this list of conditions and the following disclaimer.
+*
+*  Redistributions in binary form must reproduce the above copyright
+*  notice, this list of conditions and the following disclaimer in the
+*  documentation and/or other materials provided with the
+*  distribution.
+*
+*  Neither the name of Texas Instruments Incorporated nor the names of
+*  its contributors may be used to endorse or promote products derived
+*  from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+******************************************************************************/
+
+#include <stdint.h>
+
+/******************************************************************************
+*
+* The entry point for the application startup code.
+*
+******************************************************************************/
+extern int main(void);
+
+/******************************************************************************
+*
+* Reserve space for the system stack.
+*
+******************************************************************************/
+__attribute__ ((section(".stack")))
+static uint32_t stack[100];
+const uint32_t stack_pntr = (uint32_t)stack + sizeof(stack);
+
+/******************************************************************************
+*
+* The following are constructs created by the linker indicating where the
+* the "bss" and "ebss" segments reside in memory.
+*
+******************************************************************************/
+extern uint32_t _bss;
+extern uint32_t _ebss;
+
+/******************************************************************************
+*
+* This is the entry point that handles setting the stack within the allowed
+* workspace, initializing the .bss segment, and then jumping to main.
+*
+******************************************************************************/
+__attribute__ ((section(".entry")))
+void entry(void)
+{
+       /* Workaround for ITT instructions. */
+       __asm("         NOP");
+       __asm("         NOP");
+       __asm("         NOP");
+       __asm("         NOP");
+
+       /* Initialize stack pointer */
+       __asm("         ldr             sp, =stack_pntr");
+
+       /* Zero fill the bss segment. */
+       __asm("         ldr     r0, =_bss\n"
+                 "             ldr     r1, =_ebss\n"
+                 "             mov     r2, #0\n"
+                 "             .thumb_func\n"
+                 "     zero_loop:\n"
+                 "             cmp             r0, r1\n"
+                 "             it              lt\n"
+                 "             strlt   r2, [r0], #4\n"
+                 "             blt             zero_loop");
+
+       /* Call the application's entry point. */
+       main();
+
+       /* If we ever return, enter an infinite loop */
+       while (1)
+               ;
+}