WIP: after merge; before testing

1 files changed, 70 insertions, 0 deletions

diff --git a/ports/stm32/resethandler.s b/ports/stm32/resethandler.s
new file mode 100644
index 000000000..7f0973346
--- /dev/null
+++ b/ports/stm32/resethandler.s
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+    .syntax unified
+    .cpu cortex-m4
+    .thumb
+
+    .section .text.Reset_Handler
+    .global Reset_Handler
+    .type Reset_Handler, %function
+
+Reset_Handler:
+    /* Save the first argument to pass through to stm32_main */
+    mov  r4, r0
+
+    /* Load the stack pointer */
+    ldr  sp, =_estack
+
+    /* Initialise the data section */
+    ldr  r1, =_sidata
+    ldr  r2, =_sdata
+    ldr  r3, =_edata
+    b    .data_copy_entry
+.data_copy_loop:
+    ldr  r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
+    str  r0, [r2], #4
+.data_copy_entry:
+    cmp  r2, r3
+    bcc  .data_copy_loop
+
+    /* Zero out the BSS section */
+    movs r0, #0
+    ldr  r1, =_sbss
+    ldr  r2, =_ebss
+    b    .bss_zero_entry
+.bss_zero_loop:
+    str  r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
+.bss_zero_entry:
+    cmp  r1, r2
+    bcc  .bss_zero_loop
+
+    /* Initialise the system and jump to the main code */
+    bl   SystemInit
+    mov  r0, r4
+    b    stm32_main
+
+    .size Reset_Handler, .-Reset_Handler