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-rw-r--r--src/cmd/ld/data.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/cmd/ld/data.c b/src/cmd/ld/data.c
index 24969db55..55d020710 100644
--- a/src/cmd/ld/data.c
+++ b/src/cmd/ld/data.c
@@ -243,6 +243,16 @@ relocsym(LSym *s)
break;
}
o = symaddr(r->sym) + r->add;
+
+ // On amd64, 4-byte offsets will be sign-extended, so it is impossible to
+ // access more than 2GB of static data; fail at link time is better than
+ // fail at runtime. See http://golang.org/issue/7980.
+ // Instead of special casing only amd64, we treat this as an error on all
+ // 64-bit architectures so as to be future-proof.
+ if((int32)o < 0 && PtrSize > 4 && siz == 4) {
+ diag("non-pc-relative relocation address is too big: %#llux", o);
+ errorexit();
+ }
break;
case R_CALL:
case R_PCREL: