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* config/tc-arm.c (symbol_preemptible): New function. 

(relax_branch): Use it.
This commit is contained in:
Richard Earnshaw 2013-06-18 14:41:09 +00:00
parent e379b39141
commit e83a675fce
2 changed files with 33 additions and 6 deletions
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5
gas/ChangeLog
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@ -1,3 +1,8 @@
2013-06-18 Richard Earnshaw <rearnsha@arm.com>
* config/tc-arm.c (symbol_preemptible): New function.
(relax_branch): Use it.
2013-06-17 Catherine Moore <clm@codesourcery.com>
Maciej W. Rozycki <macro@codesourcery.com>
Chao-Ying Fu <fu@mips.com>

34
gas/config/tc-arm.c
View File

@ -20215,6 +20215,30 @@ relax_addsub (fragS *fragp, asection *sec)
return relax_immediate (fragp, 3, 0);
}
/* Return TRUE iff the definition of symbol S could be pre-empted
(overridden) at link or load time. */
static bfd_boolean
symbol_preemptible (symbolS *s)
{
/* Weak symbols can always be pre-empted. */
if (S_IS_WEAK (s))
return TRUE;
/* Non-global symbols cannot be pre-empted. */
if (! S_IS_EXTERNAL (s))
return FALSE;
#ifdef OBJ_ELF
/* In ELF, a global symbol can be marked protected, or private. In that
case it can't be pre-empted (other definitions in the same link unit
would violate the ODR). */
if (ELF_ST_VISIBILITY (S_GET_OTHER (s)) > STV_DEFAULT)
return FALSE;
#endif
/* Other global symbols might be pre-empted. */
return TRUE;
}
/* Return the size of a relaxable branch instruction. BITS is the
size of the offset field in the narrow instruction. */
@ -20233,17 +20257,15 @@ relax_branch (fragS *fragp, asection *sec, int bits, long stretch)
return 4;
#ifdef OBJ_ELF
/* A branch to a function in ARM state will require interworking. */
if (S_IS_DEFINED (fragp->fr_symbol)
&& ARM_IS_FUNC (fragp->fr_symbol))
return 4;
/* PR 12532. Global symbols with default visibility might
be preempted, so do not relax relocations to them. */
if ((ELF_ST_VISIBILITY (S_GET_OTHER (fragp->fr_symbol)) == STV_DEFAULT)
&& (! S_IS_LOCAL (fragp->fr_symbol)))
return 4;
#endif
if (symbol_preemptible (fragp->fr_symbol))
return 4;
val = relaxed_symbol_addr (fragp, stretch);
addr = fragp->fr_address + fragp->fr_fix + 4;
val -= addr;