3rd-party/linux-kernel-module-cheat
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fix wfe_ldxr_* examples with sevl to make things more hardware independant

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Ciro Santilli 六四事件 法轮功
2020-01-13 00:00:00 +00:00
parent 3b3f073e2c
commit cc1d34f862
3 changed files with 4 additions and 4 deletions
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2
README.adoc
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@@ -17523,7 +17523,7 @@ Also keep in mind that fused multiply add is FMADD.
Examples at: xref:simd-assembly[xrefstyle=full] Examples at: xref:simd-assembly[xrefstyle=full]
===== ARMv8 aarch64 ld2 instruction ===== ARMv8 aarch64 LD2 instruction
Example: link:userland/arch/aarch64/ld2.S[] Example: link:userland/arch/aarch64/ld2.S[]

2
userland/arch/aarch64/inline_asm/wfe_ldxr_str.cpp
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@@ -14,7 +14,7 @@ std::atomic_ulong done;
int futex = 1; int futex = 1;
void myfunc() { void myfunc() {
__asm__ __volatile__ ("ldxr x0, [%0];wfe;wfe" : : "r" (&futex) : "x0"); __asm__ __volatile__ ("sevl;wfe;ldxr x0, [%0];wfe" : : "r" (&futex) : "x0");
done.store(futex); done.store(futex);
} }

4
userland/arch/aarch64/inline_asm/wfe_ldxr_stxr.cpp
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@@ -14,7 +14,7 @@ std::atomic_ulong done;
int futex = 1; int futex = 1;
void myfunc() { void myfunc() {
__asm__ __volatile__ ("ldxr x0, [%0];wfe;wfe" : : "r" (&futex) : "x0"); __asm__ __volatile__ ("sevl;wfe;ldxr x0, [%0];wfe" : : "r" (&futex) : "x0");
done.store(futex); done.store(futex);
} }
@@ -28,7 +28,7 @@ int main(int argc, char **argv) {
thread = std::thread(myfunc); thread = std::thread(myfunc);
while (!done.load()) { while (!done.load()) {
if (do_sev) { if (do_sev) {
__asm__ __volatile__ ("mov x0, 1;ldxr x0, [%0];stxr w1, x0, [%0]" : : "r" (&futex) : "x0", "x1"); __asm__ __volatile__ ("ldxr x0, [%0];mov x0, 1;stxr w1, x0, [%0]" : : "r" (&futex) : "x0", "x1");
} }
} }
thread.join(); thread.join();