Enable vDSO support on arm64.

Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I20103cd6d193431ab7e8120005da1f567b9bc2eb
PiperOrigin-RevId: 244280119

1 files changed, 15 insertions, 1 deletions

diff --git a/vdso/vdso_time.cc b/vdso/vdso_time.cc
index a59771bff..9fc262f60 100644
--- a/vdso/vdso_time.cc
+++ b/vdso/vdso_time.cc
@@ -55,12 +55,26 @@ struct params {
 //
 // So instead, we use inline assembly with a construct that seems to have wide
 // compatibility across many toolchains.
+#if __x86_64__
+
+inline struct params* get_params() {
+  struct params* p = nullptr;
+  asm("leaq _params(%%rip), %0" : "=r"(p) : :);
+  return p;
+}
+
+#elif __aarch64__
+
 inline struct params* get_params() {
   struct params* p = nullptr;
-  asm volatile("leaq _params(%%rip), %0" : "=r"(p) : :);
+  asm("adr %0, _params" : "=r"(p) : :);
   return p;
 }
 
+#else
+#error "unsupported architecture"
+#endif
+
 namespace vdso {
 
 const uint64_t kNsecsPerSec = 1000000000UL;