binutils-gdb/ld/testsuite/ld-msp430-elf/initarray-nowarn.ld
Jozef Lawrynowicz 64b63c2993 MSP430: Fix alignment of __*_array_start symbols in default linker script
__{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.

Some MSP430 linker scripts do not align the __*_array start symbols, so
this added warning will catch that problem and help the user avoid
the potential incorrect execution of the program.

ld/ChangeLog:

	* emultempl/msp430.em (input_section_exists): New.
	(check_array_section_alignment): New.
	(gld${EMULATION_NAME}_finish): New.
	* scripttempl/elf32msp430.sc: Add ALIGN directives before the
	definition of __*_array_start symbols.
	* testsuite/ld-msp430-elf/finiarray-warn.ld: New test.
	* testsuite/ld-msp430-elf/finiarray-warn.r: New test.
	* testsuite/ld-msp430-elf/initarray-nowarn.ld: New test.
	* testsuite/ld-msp430-elf/initarray-warn.ld: New test.
	* testsuite/ld-msp430-elf/initarray-warn.r: New test.
	* testsuite/ld-msp430-elf/initarray.s: New test.
	* testsuite/ld-msp430-elf/msp430-elf.exp: Run new tests.
	* testsuite/ld-msp430-elf/preinitarray-warn.ld: New test.
	* testsuite/ld-msp430-elf/preinitarray-warn.r: New test.
2020-08-28 14:01:10 +01:00

46 lines
820 B
Plaintext

/* Script for ld testsuite */
OUTPUT_ARCH(msp430)
ENTRY(_start)
SECTIONS
{
.text :
{
PROVIDE (_start = .);
. = ALIGN(2);
*(.text .stub .text.* .gnu.linkonce.t.* .text:*)
}
.rodata :
{
*(.rodata.* .rodata)
. = ALIGN(2);
PROVIDE (__preinit_array_start = .);
KEEP (*(SORT(.preinit_array.*)))
KEEP (*(.preinit_array))
PROVIDE (__preinit_array_end = .);
. = ALIGN(2);
PROVIDE (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array))
PROVIDE (__init_array_end = .);
. = ALIGN(2);
PROVIDE (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array))
PROVIDE (__fini_array_end = .);
}
.data :
{
. = ALIGN(2);
*(.data.* .data)
}
.bss :
{
. = ALIGN(2);
*(.bss.* .bss)
}
}