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Update avrxmega3 linker emulation to support avrxmega2 devices with flash memory visible in the SRAM address range.

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PR ld/21472
ld  * emulparams/avrxmega3.sh (RODATA_PM_OFFSET): Set to 0x8000.
    * scripttempl/avr.sc
    (__RODATA_PM_OFFSET__) [RODATA_PM_OFFSET]: Use RODATA_PM_OFFSET
    as default if not already defined.
    (.data) [!RODATA_PM_OFFSET]: Don't include .rodata and friends.
    (.rodata) [RODATA_PM_OFFSET]: Put at an offset of
    __RODATA_PM_OFFSET__.

gas * config/tc-avr.c (mcu_types): Add entries for: attiny416,
     attiny417, attiny816, attiny817.
This commit is contained in:
eorg-Johann Lay 2017-05-19 15:06:33 +01:00 • committed by Nick Clifton
parent 6e7e1744e9
commit f4203b2b88
5 changed files with 71 additions and 1 deletions
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51
ld/scripttempl/avr.sc
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@ -4,6 +4,17 @@
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.
# RODATA_PM_OFFSET
# If empty, .rodata sections will be part of .data. This is for
# devices where it is not possible to use LD* instructions to read
# from flash.
#
# If non-empty, .rodata is not part of .data and the .rodata
# objects are assigned addresses at an offest of RODATA_PM_OFFSET.
# This is for devices that feature reading from flash by means of
# LD* instructions, provided the addresses are offset by
# __RODATA_PM_OFFSET__ (which defaults to RODATA_PM_OFFSET).
cat <<EOF
/* Copyright (C) 2014-2017 Free Software Foundation, Inc.
@ -21,7 +32,15 @@ __FUSE_REGION_LENGTH__ = DEFINED(__FUSE_REGION_LENGTH__) ? __FUSE_REGION_LENGTH_
__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;
EOF
if test -n "$RODATA_PM_OFFSET"; then
cat <<EOF
__RODATA_PM_OFFSET__ = DEFINED(__RODATA_PM_OFFSET__) ? __RODATA_PM_OFFSET__ : $RODATA_PM_OFFSET;
EOF
fi
cat <<EOF
MEMORY
{
text (rx) : ORIGIN = 0, LENGTH = __TEXT_REGION_LENGTH__
@ -187,15 +206,45 @@ SECTIONS
KEEP (*(.fini0))
${RELOCATING+ _etext = . ; }
} ${RELOCATING+ > text}
EOF
# Devices like ATtiny816 allow to read from flash memory by means of LD*
# instructions provided we add an offset of __RODATA_PM_OFFSET__ to the
# flash addresses.
if test -n "$RODATA_PM_OFFSET"; then
cat <<EOF
.rodata ${RELOCATING+ ADDR(.text) + SIZEOF (.text) + __RODATA_PM_OFFSET__ } ${RELOCATING-0} :
{
*(.rodata)
${RELOCATING+ *(.rodata*)}
*(.gnu.linkonce.r*)
} ${RELOCATING+AT> text}
EOF
fi
cat <<EOF
.data ${RELOCATING-0} :
{
${RELOCATING+ PROVIDE (__data_start = .) ; }
*(.data)
${RELOCATING+ *(.data*)}
*(.gnu.linkonce.d*)
EOF
# Classical devices that don't show flash memory in the SRAM address space
# need .rodata to be part of .data because the compiler will use LD*
# instructions and LD* cannot access flash.
if test -z "$RODATA_PM_OFFSET"; then
cat <<EOF
*(.rodata) /* We need to include .rodata here if gcc is used */
${RELOCATING+ *(.rodata*)} /* with -fdata-sections. */
*(.gnu.linkonce.d*)
*(.gnu.linkonce.r*)
EOF
fi
cat <<EOF
${RELOCATING+. = ALIGN(2);}
${RELOCATING+ _edata = . ; }
${RELOCATING+ PROVIDE (__data_end = .) ; }