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Really robust linker sets

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The previous attempt to fix this issue failed.

See also:

https://gcc.gnu.org/ml/gcc/2016-09/msg00114.htm
This commit is contained in:
Sebastian Huber 2016-11-09 08:15:22 +01:00
parent 0b08247a26
commit 617dc0f5a1
1 changed files with 11 additions and 15 deletions
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26
freebsd/sys/sys/linker_set.h
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@ -126,10 +126,19 @@
#define RWSET_DECLARE(set, ptype) \ #define RWSET_DECLARE(set, ptype) \
RTEMS_BSD_DECLARE_RWSET(set, ptype *) RTEMS_BSD_DECLARE_RWSET(set, ptype *)
static __inline void *
_linker_set_obfuscate(const void *marker)
{
/* Obfuscate the variable, so that the compiler cannot optimize */
__asm__("" : "+r" (marker));
return (__DECONST(void *, marker));
}
#define SET_BEGIN(set) \ #define SET_BEGIN(set) \
(__CONCAT(_bsd__start_set_,set)) _linker_set_obfuscate(__CONCAT(_bsd__start_set_,set))
#define SET_LIMIT(set) \ #define SET_LIMIT(set) \
(__CONCAT(_bsd__stop_set_,set)) _linker_set_obfuscate(__CONCAT(_bsd__stop_set_,set))
#endif /* __rtems__ */ #endif /* __rtems__ */
/* /*
@ -139,21 +148,8 @@
* containing those addresses. Thus is must be declared as "type **pvar", * containing those addresses. Thus is must be declared as "type **pvar",
* and the address of each set item is obtained inside the loop by "*pvar". * and the address of each set item is obtained inside the loop by "*pvar".
*/ */
#ifndef __rtems__
#define SET_FOREACH(pvar, set) \ #define SET_FOREACH(pvar, set) \
for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
#else /* __rtems__ */
static __inline void *
_set_next(__uintptr_t pvar, __size_t s)
{
__asm__("" : "+r" (pvar));
return (void *)(pvar + s);
}
#define SET_FOREACH(pvar, set) \
for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); \
pvar = _set_next((__uintptr_t)pvar, sizeof(*pvar)))
#endif /* __rtems__ */
#define SET_ITEM(set, i) \ #define SET_ITEM(set, i) \
((SET_BEGIN(set))[i]) ((SET_BEGIN(set))[i])