884b05b54e
The .init/.fini sections are not required for msp430-elf, and add unnecessary
code bloat to the CRT library. These sections are specified as "unused" by
the MSP430 EABI.
.init existed to call __crt0_run_{init,preinit}_array which run through
the functions in .{init,preinit}_array.
__crt0_run_{init,preinit}_array are already dynamically included like the
other crt0 functions, so these can be placed before the call to main,
which ensures they are still called if needed.
With these functions moved, .init has no purpose and can be removed.
.fini existed to call __crt0_run_fini_array.
However, the "__msp430_fini" symbol which marks the start of .fini has
never been used, so no termination routines have ever been run for
msp430. On returning from main(), _exit() is called which just loops
forever.
So there is no current expectation that __crt0_run_fini_array will
get called by the CRT code. Further work is to ensure functions
registered with atexit can be optionally called during program termination,
and then __crt0_run_fini_array can be registered with atexit during
program initialization.
The mechanisms for supporting the "-minrt" option have also been removed.
"-minrt" enabled a "minimum runtime environment" by removing calls to
functions which run global static initializers and constructors. Since
this behaviour is now dynamic, and these functions are only included
when needed, the minrt versions of the CRT object files are no longer
required.
277 lines
8.4 KiB
Plaintext
277 lines
8.4 KiB
Plaintext
/* Copyright (c) 2013-2015 Red Hat, Inc. All rights reserved.
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This copyrighted material is made available to anyone wishing to use, modify,
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copy, or redistribute it subject to the terms and conditions of the BSD
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License. This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY expressed or implied, including the implied warranties
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy of this license
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is available at http://www.opensource.org/licenses. Any Red Hat trademarks that
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are incorporated in the source code or documentation are not subject to the BSD
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License and may only be used or replicated with the express permission of
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Red Hat, Inc. */
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/* Default linker script, for normal MSP430 executables. */
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OUTPUT_ARCH(msp430)
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ENTRY(_start)
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INCLUDE intr_vectors.ld
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MEMORY
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{
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RAM (w) : ORIGIN = 0x00500, LENGTH = 0x0eb00
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}
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SECTIONS
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{
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.resetvec :
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{
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*(.resetvec)
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} > VECT31
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.rodata :
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{
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. = ALIGN(2);
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*(.plt)
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. = ALIGN(2);
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*(.lower.rodata.* .lower.rodata)
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. = ALIGN(2);
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*(.rodata .rodata.* .gnu.linkonce.r.* .const .const:*)
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. = ALIGN(2);
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*(.either.rodata.* .either.rodata)
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. = ALIGN(2);
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*(.rodata1)
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KEEP (*(.gcc_except_table)) *(.gcc_except_table.*)
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PROVIDE (__preinit_array_start = .);
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KEEP (*(.preinit_array))
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PROVIDE (__preinit_array_end = .);
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PROVIDE (__init_array_start = .);
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KEEP (*(SORT(.init_array.*)))
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KEEP (*(.init_array))
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PROVIDE (__init_array_end = .);
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PROVIDE (__fini_array_start = .);
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KEEP (*(.fini_array))
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KEEP (*(SORT(.fini_array.*)))
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PROVIDE (__fini_array_end = .);
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} > RAM
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/* Note: This is a separate .rodata section for sections which are
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read only but which older linkers treat as read-write.
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This prevents older linkers from marking the entire .rodata
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section as read-write. */
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.rodata2 :
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{
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. = ALIGN(2);
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*(.eh_frame_hdr)
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KEEP (*(.eh_frame))
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/* gcc uses crtbegin.o to find the start of the constructors, so
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we make sure it is first. Because this is a wildcard, it
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doesn't matter if the user does not actually link against
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crtbegin.o; the linker won't look for a file to match a
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wildcard. The wildcard also means that it doesn't matter which
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directory crtbegin.o is in. */
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KEEP (*crtbegin*.o(.ctors))
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/* We don't want to include the .ctor section from from the
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crtend.o file until after the sorted ctors. The .ctor section
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from the crtend file contains the end of ctors marker and it
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must be last */
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KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
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KEEP (*(SORT(.ctors.*)))
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KEEP (*(.ctors))
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KEEP (*crtbegin*.o(.dtors))
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KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
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KEEP (*(SORT(.dtors.*)))
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KEEP (*(.dtors))
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} > RAM
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.text :
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{
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. = ALIGN(2);
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PROVIDE (_start = .);
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KEEP (*(SORT(.crt_*)))
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*(.lowtext)
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*(.lower.text.* .lower.text)
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*(.text .stub .text.* .gnu.linkonce.t.* .text:*)
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*(.either.text.* .either.text)
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KEEP (*(.text.*personality*))
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/* .gnu.warning sections are handled specially by elf32.em. */
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*(.gnu.warning)
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*(.interp .hash .dynsym .dynstr .gnu.version*)
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PROVIDE (__etext = .);
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PROVIDE (_etext = .);
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PROVIDE (etext = .);
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. = ALIGN(2);
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KEEP (*(.tm_clone_table))
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} > RAM
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.data :
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{
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. = ALIGN(2);
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PROVIDE (__datastart = .);
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*(.lower.data.* .lower.data)
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*(.data .data.* .gnu.linkonce.d.*)
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*(.either.data.* .either.data)
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KEEP (*(.jcr))
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*(.data.rel.ro.local) *(.data.rel.ro*)
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*(.dynamic)
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KEEP (*(.gnu.linkonce.d.*personality*))
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SORT(CONSTRUCTORS)
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*(.data1)
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*(.got.plt) *(.got)
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/* We want the small data sections together, so single-instruction offsets
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can access them all, and initialized data all before uninitialized, so
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we can shorten the on-disk segment size. */
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. = ALIGN(2);
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*(.sdata .sdata.* .gnu.linkonce.s.* D_2 D_1)
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. = ALIGN(2);
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_edata = .;
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PROVIDE (edata = .);
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PROVIDE (__dataend = .);
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} > RAM
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/* Note that crt0 assumes this is a multiple of two; all the
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start/stop symbols are also assumed word-aligned. */
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PROVIDE(__romdatastart = LOADADDR(.data));
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PROVIDE (__romdatacopysize = SIZEOF(.data));
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.bss :
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{
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. = ALIGN(2);
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PROVIDE (__bssstart = .);
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*(.lower.bss.* .lower.bss)
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*(.dynbss)
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*(.sbss .sbss.*)
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*(.bss .bss.* .gnu.linkonce.b.*)
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*(.either.bss.* .either.bss)
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. = ALIGN(2);
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*(COMMON)
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. = ALIGN(2);
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PROVIDE (__bssend = .);
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} > RAM
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PROVIDE (__bsssize = SIZEOF(.bss));
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/* This section contains data that is not initialised during load
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*or* application reset. */
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.noinit (NOLOAD) :
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{
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. = ALIGN(2);
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PROVIDE (__noinit_start = .);
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*(.noinit)
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. = ALIGN(2);
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PROVIDE (__noinit_end = .);
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} > RAM
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/* This section is intended to contain data that *is* initialised during load
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but *not* on application reset. Normally the section would be stored in
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FLASH RAM, but this is not available here. We just have to hope that the
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programmer knows what they are doing. */
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.persistent :
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{
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. = ALIGN(2);
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PROVIDE (__persistent_start = .);
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*(.persistent)
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. = ALIGN(2);
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PROVIDE (__persistent_end = .);
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} > RAM
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_end = .;
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PROVIDE (end = .);
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/* The __stack_size value of 0x100 is just a guess, but since it is
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PROVIDEd the user can override it on the command line. It has to be
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set here, rather than inside the .stack section, as symbols defined
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inside sections are only evaluated during the final phase of the link,
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long after the ASSERT is checked. An ASSERT referencing a PROVIDED but
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not yet evaluated symbol will automatically fail.
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FIXME: It would be nice if this value could be automatically set via
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gcc's -fstack-usage command line option somehow. */
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PROVIDE (__stack_size = 0x100);
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.stack (ORIGIN (RAM) + LENGTH(RAM)) :
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{
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PROVIDE (__stack = .);
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*(.stack)
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/* Linker section checking ignores empty sections like
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this one so we have to have our own test here. */
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/* FIXME: This test is triggering erroneously. I have not figured
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out why yet, but I am disabling it for now as it prevents the
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gcc testsuite from working. */
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/* ASSERT (__stack > (_end + __stack_size),
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"Error: Too much data - no room left for the stack"); */
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}
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/* Make sure that .upper sections are not used without -mlarge support. */
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.upper :
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{
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*(.upper.rodata.* .upper.rodata)
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*(.upper.data.* .upper.data)
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*(.upper.bss.* .upper.bss)
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*(.upper.text.* .upper.text)
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ASSERT (SIZEOF(.upper) == 0, "This MCU does not support high memory");
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}
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/* The rest are all not normally part of the runtime image. */
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.MSP430.attributes 0 :
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{
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KEEP (*(.MSP430.attributes))
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KEEP (*(.gnu.attributes))
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KEEP (*(__TI_build_attributes))
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}
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1. */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions. */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2. */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end ) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions. */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/* DWARF 3. */
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.debug_pubtypes 0 : { *(.debug_pubtypes) }
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.debug_ranges 0 : { *(.debug_ranges) }
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/* DWARF Extension. */
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.debug_macro 0 : { *(.debug_macro) }
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/DISCARD/ : { *(.note.GNU-stack) }
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}
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