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Fix PR 20221 - adjust syms and relocs only if relax shrunk section. 

This patch fixes an edge case in linker relaxation that causes symbol
values to be computed incorrectly in the presence of align directives
in input source code.

bfd/
	* elf32-avr.c (elf32_avr_relax_delete_bytes): Adjust syms
	and relocs only if shrinking occurred.

ld/
	* testsuite/ld-avr/avr-prop-5.d: New.
	* testsuite/ld-avr/avr-prop-5.s: New.
This commit is contained in:
Denis Chertykov 2016-06-09 19:17:43 +03:00
parent 1857fe72af
commit 5c41dbc302
5 changed files with 48 additions and 3 deletions
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6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2016-06-08 Senthil Kumar Selvaraj <senthil_kumar.selvaraj@atmel.com>
PR ld/20221
* elf32-avr.c (elf32_avr_relax_delete_bytes): Adjust syms
and relocs only if shrinking occurred.
2016-06-08 H.J. Lu <hongjiu.lu@intel.com>
* elf64-i386.c (elf_i386_link_hash_entry): Add tls_get_addr.

21
bfd/elf32-avr.c
View File

@ -1828,6 +1828,7 @@ elf32_avr_relax_delete_bytes (bfd *abfd,
unsigned int symcount;
struct avr_relax_info *relax_info;
struct avr_property_record *prop_record = NULL;
bfd_boolean did_shrink = FALSE;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
@ -1863,10 +1864,16 @@ elf32_avr_relax_delete_bytes (bfd *abfd,
/* Actually delete the bytes. */
if (toaddr - addr - count > 0)
memmove (contents + addr, contents + addr + count,
(size_t) (toaddr - addr - count));
{
memmove (contents + addr, contents + addr + count,
(size_t) (toaddr - addr - count));
did_shrink = TRUE;
}
if (prop_record == NULL)
sec->size -= count;
{
sec->size -= count;
did_shrink = TRUE;
}
else
{
/* Use the property record to fill in the bytes we've opened up. */
@ -1885,6 +1892,11 @@ elf32_avr_relax_delete_bytes (bfd *abfd,
prop_record->data.align.preceding_deleted += count;
break;
};
/* If toaddr == (addr + count), then we didn't delete anything, yet
we fill count bytes backwards from toaddr. This is still ok - we
end up overwriting the bytes we would have deleted. We just need
to remember we didn't delete anything i.e. don't set did_shrink,
so that we don't corrupt reloc offsets or symbol values.*/
memset (contents + toaddr - count, fill, count);
/* Adjust the TOADDR to avoid moving symbols located at the address
@ -1892,6 +1904,9 @@ elf32_avr_relax_delete_bytes (bfd *abfd,
toaddr -= count;
}
if (!did_shrink)
return TRUE;
/* Adjust all the reloc addresses. */
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
{

7
ld/ChangeLog
View File

@ -1,4 +1,11 @@
2016-06-08 Senthil Kumar Selvaraj <senthil_kumar.selvaraj@atmel.com>
PR ld/20221
* testsuite/ld-avr/avr-prop-5.d: New.
* testsuite/ld-avr/avr-prop-5.s: New.
2016-06-09 Pitchumani Sivanupandi <pitchumani.s@atmel.com>
* testsuite/ld-avr/lds-mega.d: New test.
* testsuite/ld-avr/lds-mega.s: New test source.
* testsuite/ld-avr/lds-tiny.d: New test.

10
ld/testsuite/ld-avr/avr-prop-5.d Normal file
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@ -0,0 +1,10 @@
#name: AVR .avr.prop, single .align proper sym val test.
#as: -mmcu=avrxmega2 -mlink-relax
#ld: -mavrxmega2 --relax
#source: avr-prop-5.s
#objdump: -S
#target: avr-*-*
#...
0: 00 d0\s+rcall\s+\.\+0\s+; 0x2 <dest>
#...

7
ld/testsuite/ld-avr/avr-prop-5.s Normal file
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@ -0,0 +1,7 @@
.text
.global _start, dest
_start:
CALL dest
.align 1
dest:
NOP