altos: Move from newlib-nano to picolibc

[fw/altos] / src / lpc / ao_interrupt.c

diff --git a/src/lpc/ao_interrupt.c b/src/lpc/ao_interrupt.c
index a479ec6d59585835c508e6e2cff7ce8db47e0c13..bc2848c3bffa364ba6298d3a32c9439a817dc57c 100644 (file)
--- a/src/lpc/ao_interrupt.c
+++ b/src/lpc/ao_interrupt.c
@@ -29,15 +29,6 @@
 #define RELOCATE_INTERRUPT     1
 #endif
 
-extern void main(void);
-extern char __stack__;
-extern char __text_start__, __text_end__;
-extern char _start__, _end__;
-extern char __bss_start__, __bss_end__;
-#if RELOCATE_INTERRUPT
-extern char __interrupt_rom__, __interrupt_start__, __interrupt_end__;
-#endif
-
 /* Interrupt functions */
 
 void lpc_halt_isr(void)
@@ -49,26 +40,6 @@ void lpc_ignore_isr(void)
 {
 }
 
-void start(void) {
-#ifdef AO_BOOT_CHAIN
-       if (ao_boot_check_chain()) {
-#ifdef AO_BOOT_PIN
-               if (ao_boot_check_pin())
-#endif
-               {
-                       ao_boot_chain(AO_BOOT_APPLICATION_BASE);
-               }
-       }
-#endif
-#if RELOCATE_INTERRUPT
-       memcpy(&__interrupt_start__, &__interrupt_rom__, &__interrupt_end__ - &__interrupt_start__);
-       lpc_scb.sysmemremap = LPC_SCB_SYSMEMREMAP_MAP_RAM << LPC_SCB_SYSMEMREMAP_MAP;
-#endif
-       memcpy(&_start__, &__text_end__, &_end__ - &_start__);
-       memset(&__bss_start__, '\0', &__bss_end__ - &__bss_start__);
-       main();
-}
-
 #define STRINGIFY(x) #x
 
 #define isr(name) \
@@ -122,10 +93,13 @@ isr(usb_wakeup)
 #define i(addr,name)   [(addr)/4] = lpc_ ## name ## _isr
 #define c(addr,value)  [(addr)/4] = (value)
 
-__attribute__ ((section(".interrupt")))
-const void *lpc_interrupt_vector[] = {
-       [0] = &__stack__,
-       [1] = start,
+extern char __stack[];
+void _start(void) __attribute__((__noreturn__));
+
+__attribute__ ((section(".init")))
+const void *const __interrupt_vector[0x30] = {
+       [0] = __stack,
+       [1] = _start,
        i(0x08, nmi),
        i(0x0c, hardfault),
        c(0x10, 0),
@@ -178,3 +152,43 @@ const void *lpc_interrupt_vector[] = {
        i(0xb8, usb_wakeup),
        i(0xbc, hardfault),
 };
+
+/*
+ * Previous versions of this code had a 256 byte interupt vector. Add
+ * some padding to make sure the other low ROM variables land at the
+ * same address
+ */
+
+__attribute__ ((section(".init.0")))
+const void *const __interrupt_pad[0x10];
+
+void main(void) __attribute__((__noreturn__));
+
+void *__interrupt_ram[sizeof(__interrupt_vector)/sizeof(__interrupt_vector[0])] __attribute((section(".preserve.1")));
+
+extern char __data_source[];
+extern char __data_start[];
+extern char __data_size[];
+extern char __bss_start[];
+extern char __bss_size[];
+
+void _start(void) {
+       memcpy(__data_start, __data_source, (uintptr_t) __data_size);
+       memset(__bss_start, '\0', (uintptr_t) __bss_size);
+
+#ifdef AO_BOOT_CHAIN
+       if (ao_boot_check_chain()) {
+#ifdef AO_BOOT_PIN
+               if (ao_boot_check_pin())
+#endif
+               {
+                       ao_boot_chain(AO_BOOT_APPLICATION_BASE);
+               }
+       }
+#endif
+#if RELOCATE_INTERRUPT
+       memcpy(__interrupt_ram, __interrupt_vector, sizeof(__interrupt_ram));
+       lpc_scb.sysmemremap = LPC_SCB_SYSMEMREMAP_MAP_RAM << LPC_SCB_SYSMEMREMAP_MAP;
+#endif
+       main();
+}