On windows, the offset for the relocation doesn't get stored in
the relocation itself, but as an unsigned immediate in the opcode.
Therefore, negative offsets has to be handled via a separate sub
instruction, just as on MachO.
---
 libavutil/aarch64/asm.S | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libavutil/aarch64/asm.S b/libavutil/aarch64/asm.S
index 86d36cd..7e2af4d 100644
--- a/libavutil/aarch64/asm.S
+++ b/libavutil/aarch64/asm.S
@@ -82,6 +82,15 @@ ELF     .size   \name, . - \name
         adrp            \rd, \val+(\offset)@PAGE
         add             \rd, \rd, \val+(\offset)@PAGEOFF
     .endif
+#elif CONFIG_PIC && defined(_WIN32)
+    .if \offset < 0
+        adrp            \rd, \val
+        add             \rd, \rd, :lo12:\val
+        sub             \rd, \rd, -(\offset)
+    .else
+        adrp            \rd, \val+(\offset)
+        add             \rd, \rd, :lo12:\val+(\offset)
+    .endif
 #elif CONFIG_PIC
         adrp            \rd, \val+(\offset)
         add             \rd, \rd, :lo12:\val+(\offset)
-- 
2.7.4

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