src/rp2_common/pico_runtime/runtime.c (PicoSDK)

/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include "pico/runtime.h" #include "pico/runtime_init.h" void __weak hard_assertion_failure(void) { panic("Hard assert"); } static void runtime_run_initializers_from(uintptr_t *from) { // Start and end points of the constructor list, // defined by the linker script. extern uintptr_t __preinit_array_end; // Call each function in the list, based on the mask // We have to take the address of the symbols, as __preinit_array_start *is* // the first function value, not the address of it. for (uintptr_t *p = from; p < &__preinit_array_end; p++) { uintptr_t val = *p; ((void (*)(void))val)(); } } void runtime_run_initializers(void) { extern uintptr_t __preinit_array_start; runtime_run_initializers_from(&__preinit_array_start); } // We keep the per-core initializers in the standard __preinit_array so a standard C library // initialization will force the core 0 initialization, however we also want to be able to find // them after the fact so that we can run them on core 1. Per core initializers have sections // __preinit_array.ZZZZZ.nnnnn i.e. the ZZZZZ sorts below all the standard __preinit_array.nnnnn // values, and then we sort within the ZZZZZ. // // We create a dummy initializer in __preinit_array.YYYYY (between the standard initializers // and the per core initializers), so we find the first per core initializer. Whilst we could // have done this via an entry in the linker script, we want to preserve backwards compatibility // with RP2040 custom linker scripts. static void first_per_core_initializer(void) {} PICO_RUNTIME_INIT_FUNC(first_per_core_initializer, "YYYYY"); void runtime_run_per_core_initializers(void) { runtime_run_initializers_from(&__pre_init_first_per_core_initializer); }