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cpu/avr8_common: supports CPUs with missing CALL and JMP instructions

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This commit is contained in:
Hugues Larrive 2023-06-22 17:35:36 +02:00
parent 996ff9ba25
commit b94cd39339
1 changed files with 11 additions and 1 deletions
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12
cpu/avr8_common/startup.c
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@ -1,6 +1,7 @@
/* /*
* Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen * Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen
* 2021 Gerson Fernando Budke * 2021 Gerson Fernando Budke
* 2023 Hugues Larrive
* *
* This file is subject to the terms and conditions of the GNU Lesser * This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level * General Public License v2.1. See the file LICENSE in the top level
@ -18,6 +19,7 @@
* @author Josua Arndt <jarndt@ias.rwth-aachen.de> * @author Josua Arndt <jarndt@ias.rwth-aachen.de>
* @author Steffen Robertz <steffen.robertz@rwth-aachen.de> * @author Steffen Robertz <steffen.robertz@rwth-aachen.de>
* @author Gerson Fernando Budke <nandojve@gmail.com> * @author Gerson Fernando Budke <nandojve@gmail.com>
* @author Hugues Larrive <hugues.larrive@pm.me>
* @} * @}
*/ */
@ -48,7 +50,7 @@ extern void __libc_init_array(void);
* avr-libc normally uses the .init9 section for a call to main. This call * avr-libc normally uses the .init9 section for a call to main. This call
* seems to be not replaceable without hacking inside the library. We * seems to be not replaceable without hacking inside the library. We
* circumvent the call to main by using section .init7 to call the function * circumvent the call to main by using section .init7 to call the function
* reset_handler which therefore is the real entry point and section .init8 * reset_handler which therefore is the real entry point and section .init8
* which should never be reached but just in case jumps to exit. * which should never be reached but just in case jumps to exit.
* This way there should be no way to call main directly. * This way there should be no way to call main directly.
*/ */
@ -57,12 +59,20 @@ void init8_ovr(void) __attribute__((section(".init8")));
__attribute__((used, naked)) void init7_ovr(void) __attribute__((used, naked)) void init7_ovr(void)
{ {
#if (FLASHEND <= 0x1FFF)
__asm__ ("rjmp reset_handler");
#else
__asm__ ("call reset_handler"); __asm__ ("call reset_handler");
#endif
} }
__attribute__((used, naked)) void init8_ovr(void) __attribute__((used, naked)) void init8_ovr(void)
{ {
#if (FLASHEND <= 0x1FFF)
__asm__ ("rjmp exit");
#else
__asm__ ("jmp exit"); __asm__ ("jmp exit");
#endif
} }
/** /**