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cpu/avr8 common: added avr4.ld script #19751

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merged 2 commits into from
Jun 22, 2023
Merged

cpu/avr8 common: added avr4.ld script #19751

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996ff9b
cpu/avr8_common: added avr4.ld script
hugueslarrive Jun 22, 2023
b94cd39
cpu/avr8_common: supports CPUs with missing CALL and JMP instructions
hugueslarrive Jun 22, 2023
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27 changes: 27 additions & 0 deletions cpu/avr8_common/ldscripts/avr4.ld
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
/* Copyright (C) 2014-2015 Free Software Foundation, Inc.
Copying and distribution of this script, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. */
OUTPUT_FORMAT("elf32-avr","elf32-avr","elf32-avr")
OUTPUT_ARCH(avr:4)

__TEXT_REGION_LENGTH__ = DEFINED(__TEXT_REGION_LENGTH__) ? __TEXT_REGION_LENGTH__ : 8K;
__DATA_REGION_LENGTH__ = DEFINED(__DATA_REGION_LENGTH__) ? __DATA_REGION_LENGTH__ : 0xffa0;
__EEPROM_REGION_LENGTH__ = DEFINED(__EEPROM_REGION_LENGTH__) ? __EEPROM_REGION_LENGTH__ : 64K;
__FUSE_REGION_LENGTH__ = DEFINED(__FUSE_REGION_LENGTH__) ? __FUSE_REGION_LENGTH__ : 1K;
__LOCK_REGION_LENGTH__ = DEFINED(__LOCK_REGION_LENGTH__) ? __LOCK_REGION_LENGTH__ : 1K;
__SIGNATURE_REGION_LENGTH__ = DEFINED(__SIGNATURE_REGION_LENGTH__) ? __SIGNATURE_REGION_LENGTH__ : 1K;
__USER_SIGNATURE_REGION_LENGTH__ = DEFINED(__USER_SIGNATURE_REGION_LENGTH__) ? __USER_SIGNATURE_REGION_LENGTH__ : 1K;

MEMORY
{
text (rx) : ORIGIN = 0, LENGTH = __TEXT_REGION_LENGTH__
data (rw!x) : ORIGIN = 0x800060, LENGTH = __DATA_REGION_LENGTH__
eeprom (rw!x) : ORIGIN = 0x810000, LENGTH = __EEPROM_REGION_LENGTH__
fuse (rw!x) : ORIGIN = 0x820000, LENGTH = __FUSE_REGION_LENGTH__
lock (rw!x) : ORIGIN = 0x830000, LENGTH = __LOCK_REGION_LENGTH__
signature (rw!x) : ORIGIN = 0x840000, LENGTH = __SIGNATURE_REGION_LENGTH__
user_signatures (rw!x) : ORIGIN = 0x850000, LENGTH = __USER_SIGNATURE_REGION_LENGTH__
}

INCLUDE avr_common.ld
12 changes: 11 additions & 1 deletion cpu/avr8_common/startup.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
/*
* Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen
* 2021 Gerson Fernando Budke
* 2023 Hugues Larrive
*
* 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
Expand All @@ -18,6 +19,7 @@
* @author Josua Arndt <jarndt@ias.rwth-aachen.de>
* @author Steffen Robertz <steffen.robertz@rwth-aachen.de>
* @author Gerson Fernando Budke <nandojve@gmail.com>
* @author Hugues Larrive <hugues.larrive@pm.me>
* @}
*/

Expand Down Expand Up @@ -48,7 +50,7 @@ extern void __libc_init_array(void);
* 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
* 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.
* This way there should be no way to call main directly.
*/
Expand All @@ -57,12 +59,20 @@ void init8_ovr(void) __attribute__((section(".init8")));

__attribute__((used, naked)) void init7_ovr(void)
{
#if (FLASHEND <= 0x1FFF)
__asm__ ("rjmp reset_handler");
#else
__asm__ ("call reset_handler");
#endif
}

__attribute__((used, naked)) void init8_ovr(void)
{
#if (FLASHEND <= 0x1FFF)
__asm__ ("rjmp exit");
#else
__asm__ ("jmp exit");
#endif
}

/**
Expand Down