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libroot/ppc: Stub out emitted GCC atomics on ppc32

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* gcc will emit 64-bit (_8) atomic functions on 32-bit
  powerpc architectures. This stubs them out for now
  with a warning.
* We could do more here, but i'm just getting PPC
  bootstrapped to get the nightly builds going again.
* We could also just completely drop PPC.. but it was
  pretty close pre-pm... so I'd hate to lose that work.
This commit is contained in:
Alexander von Gluck IV 2017-07-03 13:02:02 -05:00
parent 9175f4f04a
commit b3d3ee5a2f
1 changed files with 22 additions and 71 deletions
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93
src/system/libroot/os/arch/ppc/atomic.S
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@ -1,85 +1,36 @@
/*
* Copyright 2003-2009, Axel Dörfler, axeld@pinc-software.de.
* Copyright 2017 Haiku, Inc. All rights reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Alexander von Gluck IV <kallisti5@unixzen.com>
*/
#include <asm_defs.h>
.text
/* int atomic_add(int *value, int increment)
* (r3) r3 r4
*/
FUNCTION(atomic_add):
lost1: lwarx %r5, 0, %r3 // reserve memory address located in "r3"
add %r0, %r5, %r4 // (contents are stored in "r5")
stwcx. %r0, 0, %r3
bne- lost1 // try again if reservation was lost
mr %r3, %r5 // return old value (was in "r5")
blr
FUNCTION_END(atomic_add)
#ifdef __powerpc__
#warning IMPLEMENT GCC 64-bit ATOMICS ON POWERPC 32-bit!
/* int atomic_and(int *value, int andValue)
* (r3) r3 r4
/* These are to fill in 64-bit atomic calls emitted by
* by GCC when 64-bit atomics are unavailable.
* (aka, on 32-bit PowerPC
*/
FUNCTION(atomic_and):
lost2: lwarx %r5, 0, %r3
and %r0, %r5, %r4
stwcx. %r0, 0, %r3
bne- lost2
mr %r3, %r5
blr
FUNCTION_END(atomic_and)
/* int atomic_or(int *value, int orValue)
* (r3) r3 r4
*/
FUNCTION(atomic_or):
lost3: lwarx %r5, 0, %r3
or %r0, %r5, %r4
stwcx. %r0, 0, %r3
bne- lost3
mr %r3, %r5
blr
FUNCTION_END(atomic_or)
FUNCTION(__atomic_fetch_add_8):
sync
blr
FUNCTION_END(__atomic_fetch_add_8)
/* int atomic_set(int *value, int setTo)
* (r3) r3 r4
*/
FUNCTION(atomic_set):
lost4: lwarx %r5, 0, %r3
stwcx. %r4, 0, %r3
bne- lost4
mr %r3, %r5
blr
FUNCTION_END(atomic_set)
FUNCTION(__atomic_store_8):
sync
blr
FUNCTION_END(__atomic_store_8)
/* int atomic_test_and_set(int *value, int setTo, int testValue)
* (r3) r3 r4 r5
*/
FUNCTION(atomic_test_and_set):
lost5: lwarx %r6, 0, %r3
cmpw %r6, %r5
bne out5
stwcx. %r4, 0, %r3
bne- lost5
out5: mr %r3, %r6
blr
FUNCTION_END(atomic_test_and_set)
FUNCTION(__atomic_load_8):
sync
blr
FUNCTION_END(__atomic_load_8)
// TODO: PowerPC atomic_get_and_set
FUNCTION(atomic_get_and_set):
sync
blr
FUNCTION_END(atomic_get_and_set)
/* int atomic_get(int *value)
* (r3) r3
*/
FUNCTION(atomic_get):
lost6: lwarx %r5, 0, %r3
stwcx. %r5, 0, %r3
bne- lost6
mr %r3, %r5
blr
FUNCTION_END(atomic_get)
#endif /* __powerpc__ */