DynASM/ARM64: Fix ADRP encoding with absolute address.

Thanks to Dmitry Stogov.

1 files changed, 7 insertions, 1 deletions

diff --git a/dynasm/dasm_arm64.h b/dynasm/dasm_arm64.h
index 8d1d9a96..d6da4528 100644
--- a/dynasm/dasm_arm64.h
+++ b/dynasm/dasm_arm64.h
@@ -473,7 +473,13 @@ int dasm_encode(Dst_DECL, void *buffer)
           }
           break;
         case DASM_REL_A: {
-          ptrdiff_t na = (((ptrdiff_t)(*b++) << 32) | (unsigned int)n) - (ptrdiff_t)cp + 4;
+          ptrdiff_t na = (((ptrdiff_t)(*b++) << 32) | (unsigned int)n);
+          if ((ins & 0x3000) == 0x3000) {  /* ADRP */
+            ins &= ~0x1000;
+            na = (na >> 12) - (((ptrdiff_t)cp - 4) >> 12);
+          } else {
+            na = na - (ptrdiff_t)cp + 4;
+          }
           n = (int)na;
           CK((ptrdiff_t)n == na, RANGE_REL);
           goto patchrel;