altos: Move from newlib-nano to picolibc

[fw/altos] / src / stmf0 / ao_interrupt.c

diff --git a/src/stmf0/ao_interrupt.c b/src/stmf0/ao_interrupt.c
index 1ee6e720091be2e277fca3b26536fd559caea35d..3d7dc7a82c653e2eff6be3327b4edd252ae6ad88 100644 (file)
--- a/src/stmf0/ao_interrupt.c
+++ b/src/stmf0/ao_interrupt.c
@@ -32,15 +32,6 @@
 #endif
 #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 stm_halt_isr(void)
@@ -52,8 +43,6 @@ void stm_ignore_isr(void)
 {
 }
 
-const void *stm_interrupt_vector[];
-
 uint32_t
 stm_flash_size(void) {
        uint16_t        dev_id = stm_dev_id();
@@ -67,35 +56,6 @@ stm_flash_size(void) {
        return (uint32_t) kbytes * 1024;
 }
 
-void start(void)
-{
-#if AO_BOOT_CHAIN
-       if (ao_boot_check_chain()) {
-#if AO_BOOT_PIN
-               if (ao_boot_check_pin())
-#endif
-               {
-                       ao_boot_chain(AO_BOOT_APPLICATION_BASE);
-               }
-       }
-#endif
-       /* Turn on syscfg */
-       stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGCOMPEN);
-
-#if RELOCATE_INTERRUPT
-       memcpy(&__interrupt_start__, &__interrupt_rom__, &__interrupt_end__ - &__interrupt_start__);
-       stm_syscfg.cfgr1 = (stm_syscfg.cfgr1 & ~(STM_SYSCFG_CFGR1_MEM_MODE_MASK << STM_SYSCFG_CFGR1_MEM_MODE)) |
-               (STM_SYSCFG_CFGR1_MEM_MODE_SRAM << STM_SYSCFG_CFGR1_MEM_MODE);
-#else
-       /* Switch to Main Flash mode (DFU loader leaves us in System mode) */
-       stm_syscfg.cfgr1 = (stm_syscfg.cfgr1 & ~(STM_SYSCFG_CFGR1_MEM_MODE_MASK << STM_SYSCFG_CFGR1_MEM_MODE)) |
-               (STM_SYSCFG_CFGR1_MEM_MODE_MAIN_FLASH << STM_SYSCFG_CFGR1_MEM_MODE);
-#endif
-       memcpy(&_start__, &__text_end__, &_end__ - &_start__);
-       memset(&__bss_start__, '\0', &__bss_end__ - &__bss_start__);
-       main();
-}
-
 #define STRINGIFY(x) #x
 
 #define isr(name) \
@@ -153,10 +113,14 @@ isr(usb)
 
 #define i(addr,name)   [(addr)/4] = stm_ ## name ## _isr
 
-__attribute__ ((section(".interrupt")))
-const void *stm_interrupt_vector[] = {
-       [0] = &__stack__,
-       [1] = start,
+extern char __stack[];
+void _start(void) __attribute__((__noreturn__));
+void main(void) __attribute__((__noreturn__));
+
+__attribute__ ((section(".init")))
+const void * const __interrupt_vector[0x30] = {
+       [0] = __stack,
+       [1] = _start,
        i(0x08, nmi),
        i(0x0c, hardfault),
        i(0x2c, svc),
@@ -196,3 +160,47 @@ const void *stm_interrupt_vector[] = {
        i(0xb8, cec_can),
        i(0xbc, usb),
 };
+
+/*
+ * 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 *__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);
+
+#if AO_BOOT_CHAIN
+       if (ao_boot_check_chain()) {
+#if AO_BOOT_PIN
+               ao_boot_check_pin();
+#endif
+       }
+#endif
+       /* Turn on syscfg */
+       stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGCOMPEN);
+
+#if RELOCATE_INTERRUPT
+       memcpy(__interrupt_ram, __interrupt_vector, sizeof(__interrupt_ram));
+       stm_syscfg.cfgr1 = (stm_syscfg.cfgr1 & ~(STM_SYSCFG_CFGR1_MEM_MODE_MASK << STM_SYSCFG_CFGR1_MEM_MODE)) |
+               (STM_SYSCFG_CFGR1_MEM_MODE_SRAM << STM_SYSCFG_CFGR1_MEM_MODE);
+#else
+       /* Switch to Main Flash mode (DFU loader leaves us in System mode) */
+       stm_syscfg.cfgr1 = (stm_syscfg.cfgr1 & ~(STM_SYSCFG_CFGR1_MEM_MODE_MASK << STM_SYSCFG_CFGR1_MEM_MODE)) |
+               (STM_SYSCFG_CFGR1_MEM_MODE_MAIN_FLASH << STM_SYSCFG_CFGR1_MEM_MODE);
+#endif
+       main();
+}