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Update this file so that BIND on ARM can actually work. I quote:

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The problem was, isc_atomic_cmpxchg() is almost like our
	atomic_cmpset_32(), except it expects the old value to be
	returned, whereas our atomic_cmpset_32 returns 1 on success,
	or 0 on failure. So I re-implemented something suitable.

Submitted by:	cognet
Reviewed by:	bsdimp
This commit is contained in:
Doug Barton 2007-12-03 08:26:34 +00:00
parent a6861a2eb3
commit 3104e2690b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor/bind9/dist/; revision=174206
svn path=/vendor/bind9/9.4.2/; revision=174208; tag=vendor/bind9/9.4.2
1 changed files with 23 additions and 1 deletions
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24
contrib/bind9/lib/isc/arm/include/isc/atomic.h
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@ -49,7 +49,29 @@ isc_atomic_store(isc_int32_t *p, isc_int32_t val)
static inline isc_int32_t
isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val)
{
return atomic_cmpset_int(p, cmpval, val);
register int done, ras_start;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"mov %0, #0xe0000004\n"
"str %1, [%0]\n"
"mov %0, #0xe0000008\n"
"adr %1, 2f\n"
"str %1, [%0]\n"
"ldr %1, [%2]\n"
"cmp %1, %3\n"
"streq %4, [%2]\n"
"2:\n"
"mov %3, #0\n"
"mov %0, #0xe0000004\n"
"str %3, [%0]\n"
"mov %3, #0xffffffff\n"
"mov %0, #0xe0000008\n"
"str %3, [%0]\n"
: "=r" (ras_start), "=r" (done)
,"+r" (p), "+r" (cmpval), "+r" (val) : : "memory");
return (done);
}
#else /* !FreeBSD */