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| author | Max Filippov <jcmvbkbc@gmail.com> | 2019-04-18 16:37:00 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2019-05-15 10:31:52 -0700 |
| commit | b345e140534ea17814b02bdf8798f18db6295304 (patch) | |
| tree | f9320a22da357d31ad10e17a340300b02a389b98 /tests/tcg/xtensa | |
| parent | 98736654f3dfbf984d9e26c9be0480b0560c1067 (diff) | |
| download | qemu-b345e140534ea17814b02bdf8798f18db6295304.zip qemu-b345e140534ea17814b02bdf8798f18db6295304.tar.gz qemu-b345e140534ea17814b02bdf8798f18db6295304.tar.bz2 | |
target/xtensa: implement exclusive access option
The Exclusive Instructions provide a general-purpose mechanism for
atomic updates of memory-based synchronization variables that can be
used for exclusion algorithms.
Use cmpxchg-based implementation that is sufficient for the typical use
of exclusive access in atomic operations.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'tests/tcg/xtensa')
| -rw-r--r-- | tests/tcg/xtensa/test_exclusive.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/tests/tcg/xtensa/test_exclusive.S b/tests/tcg/xtensa/test_exclusive.S new file mode 100644 index 0000000..7757a55 --- /dev/null +++ b/tests/tcg/xtensa/test_exclusive.S @@ -0,0 +1,48 @@ +#include "macros.inc" + +test_suite exclusive + +#if XCHAL_HAVE_EXCLUSIVE + +test exclusive_nowrite + movi a2, 0x29 + wsr a2, atomctl + clrex + movi a2, 1f + movi a3, 1 + s32ex a3, a2 + getex a3 + assert eqi, a3, 0 + l32i a3, a2, 0 + assert eqi, a3, 3 + +.data +.align 4 +1: + .word 3 +.text +test_end + +test exclusive_write + movi a2, 0x29 + wsr a2, atomctl + movi a2, 1f + l32ex a3, a2 + assert eqi, a3, 3 + movi a3, 2 + s32ex a3, a2 + getex a3 + assert eqi, a3, 1 + l32i a3, a2, 0 + assert eqi, a3, 2 + +.data +.align 4 +1: + .word 3 +.text +test_end + +#endif + +test_suite_end |