Currently we don't use the irritator signal in our floating point stress
tests so when we added ZA and ZT stress tests we didn't actually bother
implementing any actual action in the handlers, we just counted the signal
deliveries. In preparation for using the irritators let's implement them,
just trivially SMSTOP and SMSTART to reset all bits in the register to 0.
Acked-by: Mark Rutland <mark.rutl...@arm.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
---
tools/testing/selftests/arm64/fp/za-test.S | 12 ++++--------
tools/testing/selftests/arm64/fp/zt-test.S | 12 ++++--------
2 files changed, 8 insertions(+), 16 deletions(-)
diff --git a/tools/testing/selftests/arm64/fp/za-test.S
b/tools/testing/selftests/arm64/fp/za-test.S
index
1ee0ec36766d2bef92aff50a002813e76e22963c..f902e6ef9077bfa34fa7f85ce572ce3df4346789
100644
--- a/tools/testing/selftests/arm64/fp/za-test.S
+++ b/tools/testing/selftests/arm64/fp/za-test.S
@@ -148,20 +148,16 @@ function check_za
b memcmp
endfunction
-// Any SME register modified here can cause corruption in the main
-// thread -- but *only* the locations modified here.
+// Modify the live SME register state, signal return will undo our changes
function irritator_handler
// Increment the irritation signal count (x23):
ldr x0, [x2, #ucontext_regs + 8 * 23]
add x0, x0, #1
str x0, [x2, #ucontext_regs + 8 * 23]
- // Corrupt some random ZA data
-#if 0
- movi v0.8b, #1
- movi v9.16b, #2
- movi v31.8b, #3
-#endif
+ // This will reset ZA to all bits 0
+ smstop
+ smstart
ret
endfunction
diff --git a/tools/testing/selftests/arm64/fp/zt-test.S
b/tools/testing/selftests/arm64/fp/zt-test.S
index
ade9c98abcdafc2755ef4796670566d99e919e5c..c96cb7c2ad4b406c54099fe3f73917259bd947e4
100644
--- a/tools/testing/selftests/arm64/fp/zt-test.S
+++ b/tools/testing/selftests/arm64/fp/zt-test.S
@@ -117,20 +117,16 @@ function check_zt
b memcmp
endfunction
-// Any SME register modified here can cause corruption in the main
-// thread -- but *only* the locations modified here.
+// Modify the live SME register state, signal return will undo our changes
function irritator_handler
// Increment the irritation signal count (x23):
ldr x0, [x2, #ucontext_regs + 8 * 23]
add x0, x0, #1
str x0, [x2, #ucontext_regs + 8 * 23]
- // Corrupt some random ZT data
-#if 0
- movi v0.8b, #1
- movi v9.16b, #2
- movi v31.8b, #3
-#endif
+ // This will reset ZT to all bits 0
+ smstop
+ smstart
ret
endfunction
--
2.39.2
