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ARM: stub out missing int64 atomic functions

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Also, add an item to the TODO list for this. Really need to figure it out soon...
This commit is contained in:
Ithamar R. Adema 2013-09-15 03:59:19 +02:00
parent 20d9063c36
commit ef5e0ba938
2 changed files with 26 additions and 68 deletions
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5
docs/develop/ports/arm/todo.txt
View File

@ -1,3 +1,8 @@
* Determine how to handle atomic functions on ARM.
GCC inlines are not supported, since the instructionset is ill-equiped for
this on older (pre-ARMv7) architectures. We possibly have to do something
similar to the linux kernel helper functions for this....
* Figure out how to get page flags (modified/accessed) and implement it ;)
use unmapped/read-only mappings to trigger soft faults
for tracking used/modified flags for ARMv5 and ARMv6

89
src/system/libroot/os/arch/arm/atomic.S
View File

@ -164,83 +164,36 @@ FUNCTION(atomic_get):
bx lr
FUNCTION_END(atomic_get)
FUNCTION(__sync_fetch_and_add_4):
bx lr
FUNCTION_END(__sync_fetch_and_add_4)
/* int64 atomic_add64(vint64 *value, int64 addValue) */
//FUNCTION(atomic_add64):
// movem.l %d2-%d3/%a2,-(%a7)
// move.l (4,%a7),%a2
// lea.l (4,%a2),%a1
// // addValue
// move.l (12,%a7),%d3 /*LSB*/
// move.l (8,%a7),%d2 /*MSB*/
//miss5: // old value
// move.l (%a1),%d1 /*LSB*/
// move.l (%a2),%d0 /*MSB*/
// add.l %d1,%d3
// addx.l %d0,%d2
// cas2.l %d0:%d1,%d2:%d3,(%a2):(%a1)
// bne miss5
// // return value d0:d1
// movem.l (%a7)+,%d2-%d3/%a2
// rts
//FUNCTION_END(atomic_add64)
FUNCTION(atomic_add64):
bx lr
FUNCTION_END(atomic_add64)
/* int64 atomic_and64(vint64 *value, int64 andValue) */
//FUNCTION(atomic_and64):
//FUNCTION_END(atomic_and64)
FUNCTION(atomic_and64):
bx lr
FUNCTION_END(atomic_and64)
/* int64 atomic_or64(vint64 *value, int64 orValue) */
//FUNCTION(atomic_or64):
//FUNCTION_END(atomic_or64)
FUNCTION(atomic_or64):
bx lr
FUNCTION_END(atomic_or64)
/* int64 atomic_set64(vint64 *value, int64 newValue) */
//FUNCTION(atomic_set64):
// movem.l %d2-%d3/%a2,-(%a7)
// move.l (4,%a7),%a2
// lea.l (4,%a2),%a1
// // new value
// move.l (12,%a7),%d3 /*LSB*/
// move.l (8,%a7),%d2 /*MSB*/
// // old value
// move.l (%a1),%d1 /*LSB*/
// move.l (%a2),%d0 /*MSB*/
//miss8: cas2.l %d0:%d1,%d2:%d3,(%a2):(%a1)
// bne miss8
// // return value d0:d1
// movem.l (%a7)+,%d2-%d3/%a2
// rts
//FUNCTION_END(atomic_set64)
FUNCTION(atomic_set64):
bx lr
FUNCTION_END(atomic_set64)
/* int64 atomic_test_and_set64(vint64 *value, int64 newValue, int64 testAgainst) */
//FUNCTION(atomic_test_and_set64):
// movem.l %d2-%d3/%a2,-(%a7)
// move.l (4,%a7),%a2
// lea.l (4,%a2),%a1
// // new value
// move.l (12,%a7),%d3 /*LSB*/
// move.l (8,%a7),%d2 /*MSB*/
// // test against value
// move.l (20,%a7),%d1 /*LSB*/
// move.l (16,%a7),%d0 /*MSB*/
// cas2.l %d0:%d1,%d2:%d3,(%a2):(%a1)
// // return value d0:d1
// movem.l (%a7)+,%d2-%d3/%a2
// rts
//FUNCTION_END(atomic_test_and_set64)
FUNCTION(atomic_test_and_set64):
bx lr
FUNCTION_END(atomic_test_and_set64)
/* int64 atomic_get64(vint64 *value) */
//FUNCTION(atomic_get64):
// movem.l %d2-%d3/%a2,-(%a7)
// move.l (4,%a7),%a2
// lea.l (4,%a2),%a1
// move.l (%a1),%d1 /*LSB*/
// move.l (%a2),%d0 /*MSB*/
// move.l %d1,%d3
// move.l %d0,%d2
// // we must use cas... so we change to the same value if matching,
// // else we get the correct one anyway
// cas2.l %d0:%d1,%d2:%d3,(%a2):(%a1)
// // return value
// movem.l (%a7)+,%d2-%d3/%a2
// rts
//FUNCTION_END(atomic_get64)
FUNCTION(atomic_get64):
bx lr
FUNCTION_END(atomic_get64)