Return randomness from the a1 register and not a0

keystone-enclave · Nov 20, 2022 · 31da6e3 · 31da6e3
1 parent 6958c3b
commit 31da6e3
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/sbi.c b/sbi.c
@@ -52,7 +52,9 @@ sbi_exit_enclave(uint64_t retval) {
 
 uintptr_t
 sbi_random() {
-  return SBI_CALL_0(SBI_EXT_EXPERIMENTAL_KEYSTONE_ENCLAVE, SBI_SM_RANDOM);
+  SBI_CALL_0(SBI_EXT_EXPERIMENTAL_KEYSTONE_ENCLAVE, SBI_SM_RANDOM);
+  register uintptr_t a1 __asm__("a1");
+  return a1;
 }
 
 uintptr_t