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2012-02-02 Vidya Praveen (vidya.praveen@atmel.com)

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PR bfd/13410
	* bfd/elf32-avr.c (elf32_avr_relax_section): Correct the
	condition that qualifies the candidates for relaxation.
This commit is contained in:
Eric B. Weddington 2012-02-02 18:02:10 +00:00
parent c709a7c2b0
commit 526f25b299
2 changed files with 29 additions and 9 deletions
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6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2012-02-02 Vidya Praveen (vidya.praveen@atmel.com)
PR bfd/13410
* bfd/elf32-avr.c (elf32_avr_relax_section): Correct the
condition that qualifies the candidates for relaxation.
2012-02-02 Tristan Gingold <gingold@adacore.com>
* bfdio.c (real_fopen): Remove unused vms_modes variable.

32
bfd/elf32-avr.c
View File

@ -1659,6 +1659,16 @@ elf32_avr_relax_section (bfd *abfd,
Elf_Internal_Sym *isymbuf = NULL;
struct elf32_avr_link_hash_table *htab;
/* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
relaxing. Such shrinking can cause issues for the sections such
as .vectors and .jumptables. Instead the unused bytes should be
filled with nop instructions. */
bfd_boolean shrinkable = TRUE;
if (!strcmp (sec->name,".vectors")
|| !strcmp (sec->name,".jumptables"))
shrinkable = FALSE;
if (link_info->relocatable)
(*link_info->callbacks->einfo)
(_("%P%F: --relax and -r may not be used together\n"));
@ -1815,10 +1825,16 @@ elf32_avr_relax_section (bfd *abfd,
/* Compute the distance from this insn to the branch target. */
gap = value - dot;
/* If the distance is within -4094..+4098 inclusive, then we can
relax this jump/call. +4098 because the call/jump target
will be closer after the relaxation. */
if ((int) gap >= -4094 && (int) gap <= 4098)
/* Check if the gap falls in the range that can be accommodated
in 13bits signed (It is 12bits when encoded, as we deal with
word addressing). */
if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095))
distance_short_enough = 1;
/* If shrinkable, then we can check for a range of distance which
is two bytes farther on both the directions because the call
or jump target will be closer by two bytes after the
relaxation. */
else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097))
distance_short_enough = 1;
/* Here we handle the wrap-around case. E.g. for a 16k device
@ -1892,11 +1908,9 @@ elf32_avr_relax_section (bfd *abfd,
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
R_AVR_13_PCREL);
/* Check for the vector section. There we don't want to
modify the ordering! */
if (!strcmp (sec->name,".vectors")
|| !strcmp (sec->name,".jumptables"))
/* We should not modify the ordering if 'shrinkable' is
FALSE. */
if (!shrinkable)
{
/* Let's insert a nop. */
bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);