Differential D144533
[clang][driver] Do not emit default '-Tdata' for AVR devices Authored by benshi001 on Feb 21 2023, 7:46 PM.
Details Different AVR devices have different data regions. Current clang A better solution for deciding the default data region in the
Diff Detail
Event TimelineComment Actions Different AVR device families have different default linker scripts in avr-ld, but they have 95% similarity and look like as following, we can use --defsym=__DATA_REGION_ORIGIN__ to decide the default data region range instead of current -Tdata. /* Script for ld -r: link without relocation */
/* 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:6)
__TEXT_REGION_ORIGIN__ = DEFINED(__TEXT_REGION_ORIGIN__) ? __TEXT_REGION_ORIGIN__ : 0;
__DATA_REGION_ORIGIN__ = DEFINED(__DATA_REGION_ORIGIN__) ? __DATA_REGION_ORIGIN__ : 0x800200;
__TEXT_REGION_LENGTH__ = DEFINED(__TEXT_REGION_LENGTH__) ? __TEXT_REGION_LENGTH__ : 1024K;
__DATA_REGION_LENGTH__ = DEFINED(__DATA_REGION_LENGTH__) ? __DATA_REGION_LENGTH__ : 0xfe00;
__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 = __TEXT_REGION_ORIGIN__, LENGTH = __TEXT_REGION_LENGTH__
data (rw!x) : ORIGIN = __DATA_REGION_ORIGIN__, 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__
}
SECTIONS
{
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/* Internal text space or external memory. */
.text 0 :
{
*(.vectors)
KEEP(*(.vectors))
/* For data that needs to reside in the lower 64k of progmem. */
/* PR 13812: Placing the trampolines here gives a better chance
that they will be in range of the code that uses them. */
/* The jump trampolines for the 16-bit limited relocs will reside here. */
*(.trampolines)
/* avr-libc expects these data to reside in lower 64K. */
/* For future tablejump instruction arrays for 3 byte pc devices.
We don't relax jump/call instructions within these sections. */
*(.jumptables)
/* For code that needs to reside in the lower 128k progmem. */
*(.lowtext)
KEEP(SORT(*)(.ctors))
KEEP(SORT(*)(.dtors))
/* From this point on, we don't bother about wether the insns are
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*(.init0) /* Start here after reset. */
KEEP (*(.init0))
*(.init1)
KEEP (*(.init1))
*(.init2) /* Clear __zero_reg__, set up stack pointer. */
KEEP (*(.init2))
*(.init3)
KEEP (*(.init3))
*(.init4) /* Initialize data and BSS. */
KEEP (*(.init4))
*(.init5)
KEEP (*(.init5))
*(.init6) /* C++ constructors. */
KEEP (*(.init6))
*(.init7)
KEEP (*(.init7))
*(.init8)
KEEP (*(.init8))
*(.init9) /* Call main(). */
KEEP (*(.init9))
*(.text)
*(.fini9) /* _exit() starts here. */
KEEP (*(.fini9))
*(.fini8)
KEEP (*(.fini8))
*(.fini7)
KEEP (*(.fini7))
*(.fini6) /* C++ destructors. */
KEEP (*(.fini6))
*(.fini5)
KEEP (*(.fini5))
*(.fini4)
KEEP (*(.fini4))
*(.fini3)
KEEP (*(.fini3))
*(.fini2)
KEEP (*(.fini2))
*(.fini1)
KEEP (*(.fini1))
*(.fini0) /* Infinite loop after program termination. */
KEEP (*(.fini0))
}
.data 0 :
{
*(.data)
*(.gnu.linkonce.d*)
*(.rodata) /* We need to include .rodata here if gcc is used */
/* with -fdata-sections. */
*(.gnu.linkonce.r*)
}
.bss 0 :
{
*(.bss)
*(COMMON)
}
/* Global data not cleared after reset. */
.noinit 0:
{
*(.noinit*)
}
.eeprom 0:
{
/* See .data above... */
KEEP(*(.eeprom*))
}
.fuse 0:
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KEEP(*(.fuse))
KEEP(*(.lfuse))
KEEP(*(.hfuse))
KEEP(*(.efuse))
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.lock 0:
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}Comment Actions Because,
The benefits
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