blob: 183cea18504e0de95dea9f66e8b9483889c75558 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
!=======================================================================
! solaris_sparc.s -- compare and swap for solaris_sparc
!=======================================================================
! Fortunately the Sun compiler can process cpp conditionals with -P
! '/' is the comment for x86, while '!' is the comment for Sparc
#if defined(__sparcv9) || defined(__sparc)
.section ".text"
.align 8
.skip 24
.align 4
.global pg_atomic_cas
pg_atomic_cas:
! "cas" only works on sparcv9 and sparcv8plus chips, and
! requies a compiler targeting these CPUs. It will fail
! on a compiler targeting sparcv8, and of course will not
! be understood by a sparcv8 CPU. gcc continues to use
! "ldstub" because it targets sparcv7.
!
! There is actually a trick for embedding "cas" in a
! sparcv8-targeted compiler, but it can only be run
! on a sparcv8plus/v9 cpus:
!
! http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
!
#if defined(__sparcv9) || defined(__sparcv8plus)
cas [%o0],%o2,%o1
#else
ldstub [%o0],%o1
#endif
mov %o1,%o0
retl
nop
.type pg_atomic_cas,2
.size pg_atomic_cas,(.-pg_atomic_cas)
#endif
|
