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authoreorg-Johann Lay <avr@gjlay.de>2017-05-19 15:06:33 +0100
committerNick Clifton <nickc@redhat.com>2017-05-19 15:06:33 +0100
commitf4203b2b8830e66e5229b7f9d30cd29b088566b5 (patch)
tree5e2d585c1401cb5d4dc6e1b812e7ac899a6db24d /ld/scripttempl
parent6e7e1744e96abbf1a4229d5f269caf2cc921ec58 (diff)
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Update avrxmega3 linker emulation to support avrxmega2 devices with flash memory visible in the SRAM address range.
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.
Diffstat (limited to 'ld/scripttempl')
-rw-r--r--ld/scripttempl/avr.sc51
1 files changed, 50 insertions, 1 deletions
diff --git a/ld/scripttempl/avr.sc b/ld/scripttempl/avr.sc
index b889180..144d32d 100644
--- a/ld/scripttempl/avr.sc
+++ b/ld/scripttempl/avr.sc
@@ -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 = .) ; }