flash/nor: add support for TI MSP432 devices

[openocd.git] / contrib / loaders / flash / msp432 / startup_msp432e4.c

diff --git a/contrib/loaders/flash/msp432/startup_msp432e4.c b/contrib/loaders/flash/msp432/startup_msp432e4.c
new file mode 100644 (file)
index 0000000..8adce83
--- /dev/null
+++ b/contrib/loaders/flash/msp432/startup_msp432e4.c
@@ -0,0 +1,122 @@
+/******************************************************************************
+*
+* Copyright (C) 2017-2018 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>
+
+/* Entry point for the application. */
+extern int main();
+
+/* Reserve space for the system stack. */
+extern uint32_t __stack_top;
+
+typedef void(*pFunc)(void);
+
+/* Interrupt handler prototypes */
+void default_handler(void);
+void reset_handler(void);
+
+/*
+ * The vector table.  Note that the proper constructs must be placed on this to
+ * ensure that it ends up at physical address 0x0000.0000 or at the start of
+ * the program if located at a start address other than 0.
+ */
+void (* const intr_vectors[])(void) __attribute__((section(".intvecs"))) = {
+       (pFunc)&__stack_top, /* The initial stack pointer */
+       reset_handler,       /* The reset handler         */
+       default_handler,     /* The NMI handler           */
+       default_handler,     /* The hard fault handler    */
+       default_handler,     /* The MPU fault handler     */
+       default_handler,     /* The bus fault handler     */
+       default_handler,     /* The usage fault handler   */
+       0,                   /* Reserved                  */
+       0,                   /* Reserved                  */
+       0,                   /* Reserved                  */
+       0,                   /* Reserved                  */
+       default_handler,     /* SVCall handler            */
+       default_handler,     /* Debug monitor handler     */
+       0,                   /* Reserved                  */
+       default_handler,     /* The PendSV handler        */
+       default_handler      /* The SysTick handler       */
+};
+
+/*
+ * The following are constructs created by the linker, indicating where the
+ * the "data" and "bss" segments reside in memory.  The initializers for the
+ * for the "data" segment resides immediately following the "text" segment.
+ */
+extern uint32_t __bss_start__;
+extern uint32_t __bss_end__;
+
+/*
+ * This is the code that gets called when the processor first starts execution
+ * following a reset event.  Only the absolutely necessary set is performed,
+ * after which the application supplied entry() routine is called.  Any fancy
+ * actions (such as making decisions based on the reset cause register, and
+ * resetting the bits in that register) are left solely in the hands of the
+ * application.
+ */
+__attribute__((section(".reset"))) __attribute__((naked))
+void reset_handler(void)
+{
+       /* Set stack pointer */
+       __asm("    MOVW.W  r0, #0x1700\n"
+                 "    MOVT.W  r0, #0x2000\n"
+                 "    mov     sp, r0\n");
+
+       /* Zero fill the bss segment. */
+       __asm("    ldr     r0, =__bss_start__\n"
+                 "    ldr     r1, =__bss_end__\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();
+}
+
+/*
+ * This is the code that gets called when the processor receives an unexpected
+ * interrupt.  This simply enters an infinite loop, preserving the system state
+ * for examination by a debugger.
+ */
+void default_handler(void)
+{
+       /* Enter an infinite loop. */
+       while (1)
+               ;
+}