Commit Graph

14 Commits

Author SHA1 Message Date
Jozef Lawrynowicz e3f29b2472 MSP430: Increase the amount of main memory available in sim ld scripts
The main memory region of the GDB simulator ends at address 0xFFBF,
but the simulator linker scripts do not make full use of this available
memory.

>From 61f3d212741acee583e21ff2c2808775584ecad6 Mon Sep 17 00:00:00 2001
From: Jozef Lawrynowicz <jozef.l@mittosystems.com>
Date: Mon, 3 Aug 2020 19:38:23 +0100
Subject: [PATCH 2/2] MSP430: Increase the amount of main memory available in
 sim ld scripts

The main memory region of the GDB simulator ends at address 0xFFBF,
but the simulator linker scripts do not make full use of this available
memory.
2020-08-07 15:16:43 +02:00
Jozef Lawrynowicz 748970c833 MSP430: Word align __*_array_start symbols in sim linker scripts
__{preinit,init,fini}_array_start symbols must be word aligned in
linker scripts. If the section preceding the __*_array_start symbol
has an odd size, then a NULL byte will be present between the start
symbol and the .*_array section itself, when the section gets
automatically word-aligned.

This results in a branch to an invalid address when the CRT startup
code tries to run through the functions listed in the array sections.

>From de115144d05ecbaa82c9c737cc261715ca4b7d67 Mon Sep 17 00:00:00 2001
From: Jozef Lawrynowicz <jozef.l@mittosystems.com>
Date: Mon, 3 Aug 2020 19:09:46 +0100
Subject: [PATCH 1/2] MSP430: Word align __*_array_start symbols in sim linker
 scripts

__{preinit,init,fini}_array_start symbols must be word aligned in
linker scripts. If the section preceding the __*_array_start symbol
has an odd size, then a NULL byte will be present between the start
symbol and the .*_array section itself, when the section gets
automatically word-aligned.

This results in a branch to an invalid address when the CRT startup
code tries to run through the functions listed in the array sections.
2020-08-07 15:16:43 +02:00
Jozef Lawrynowicz 884b05b54e MSP430: Remove .init/.fini sections
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.
2019-07-24 16:22:00 -04:00
Nick Clifton 9f664259f9 Fix typo in the name of the MSP430 attribute section of example MSP430 linker scripts. 2016-04-07 12:13:10 +01:00
Nick Clifton c86b2f8e93 Remove bogus LONG(0) directives from MSP430 linker scripts. 2016-03-10 10:41:13 +00:00
Nick Clifton 3ff65caea5 Always define __high_bsssize, do not just PROVIDE it.
* msp430/msp430xl-sim.ld (__high_bsssize): Define.
2015-12-04 10:14:10 +00:00
Nick Clifton c70d8f454a Fix initialisation of .upper.bss for the MSP430.
* msp430/msp430xl-sim.ld (__high_bsssize): Define.
2015-11-23 09:00:23 +00:00
Nick Clifton 3b8933900f Add support for persistent data to the MSP430 linker scripts.
* msp430/msp430-sim.ld: Add .persistent section.
	Tidy up section layout.
	Start RAM above hardware multiply registers.
	* msp430/msp430xl-sim.ld: Likewise.
2015-10-06 17:33:16 +01:00
Nick Clifton 324bd11706 Add a check that the data area does not overrun the stack.
* msp430/msp430-sim.ld (.stack): Add an assertion to make sure
	that the data area does not overrun the stack.  PROVIDE a new
	symbol __stack_size to allow the user to set the limit.
	* msp430/msp430xl-sim.ld (.stack): Likewise.
	* rl78/rl78-sim.ld (.stack): Likewise.
	* rl78/rl78.ld (.stack): Likewise.
	* rx/rx-sim.ld (.stack): Likewise.
	* rx/rx.ld (.stack): Likewise.
2015-05-27 13:30:19 +02:00
Nick Clifton baa681fd38 Adds support for placing MSP430 code and data into either low memory or high memory.
* msp430/msp430.ld: Delete.
	* msp430/msp430F5438A-l.ld: Delete.
	* msp430/msp430F5438A-s.ld: Delete.
	* msp430/crt_movedata.S: Delete.

	* msp430/Makefile.in (SCRIPTS): Remove msp430.ld.
	(CRT_OBJS): Add crt_move_highdata.o.
	* msp430/memmodel.h (START_CRT_FUNC): New macro.
	(END_CRT_FUNC): New macro.
	(WEAK_DEF): New macro.
	* msp430/crt0.S: Use new macros.
	(move_highdata): New code to initialise the .data section if it is
	held in high memory.

	* msp430/msp430-sim.ld (.data): Add .either.data.
	(.rodata2): Move some read-only data sections here.
	(.text): Add .either.text.
	(.rodata): Add .either.rodata.
	(.bss): Add .either.bss.
	* msp430/msp430xl-sim.ld (MEMORY): Add HIROM.
	(.rodata2): Move some read-only data sections here.
	(.upper.data): New section.  Include notes about how to initialise
	it.
2015-05-27 13:30:19 +02:00
Nick Clifton b7d6a7c805 * msp430/Makefile.in (CRT_OBJS): Add crt_high_bss.o.
* msp430/crt0.S (high_bss): Add.
	* msp430/msp430-sim.ld: Add error message if .upper sections are
	detected.
	* msp430/msp430xl-sim.ld (MEMORY): Adjust to better mimic real
	life MCUs.  Add support for upper and lower sections.
2014-11-13 10:18:57 +00:00
DJ Delorie ed94d4a4aa * msp430/Makefile.in (crt0-minrt.o, crtn-minrt.o): New. Build
from crt0.S with -DMINRT.
(CRT_OBJS): Expand.
(crt_%.o): New rule pattern.  Build multiple objects from crt0.S.
* msp430/crt0.S: Further break out functionality.  Support -DMINRT
that omits all init/fini logic.
* msp430/crtn.S: Likewise.
* msp430/msp430-sim.ld: Wildcard all .crt_* sections, sorted.
* msp430/msp430.ld: Likewise.
* msp430/msp430xl-sim.ld: Likewise.
2014-01-30 02:46:34 +00:00
Nick Clifton 796a9241b3 * msp430/Makefile.in (SCRIPTS): Add intr_vectors.ld.
(LIB_CRT): New.
	(CRT_OBJS): New.
	(all): Add dependency upon LIB_CRT.
	(install): Likewise.
	* msp430/msp430-sim.ld: Include intr_vectors.ld.
	KEEP crt code, lowtext code and tm_clone_table.
	Separate the noinit section from the .bss section.
	Allow for extended .debug_line sections.
	* msp430/msp430.ld: Likewise.
	* msp430/msp430F5438A-l.ld: Likewise.
	* msp430/msp430F5438A-s.ld: Likewise.
	* msp430/msp430xl-sim.ld: Likewise
.	* msp430/crt_movedata.S: New.
	* msp430/crt_bss.S: New.
	* msp430/intr_vectors.ld: New.
2013-09-18 07:38:13 +00:00
DJ Delorie 2f2a304234 [newlib]
* configure.host (msp430): Add.
* libc/include/machine/ieeefp.h: Add MSP430 support.
* libc/include/machine/setjmp.h: Likewise.
* libc/include/sys/config.h: Likewise.
* libc/machine/configure.in (msp430): Add.
* libc/machine/configure: Regenerate.
* libc/machine/msp430: New directory.

[libgloss]
* configure.in (msp430*-*-elf): Add.
* configure: Regenerate.
* msp430: New directory.
2013-05-13 21:39:51 +00:00