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| author | Shenghou Ma <minux.ma@gmail.com> | 2014-05-19 22:39:42 -0400 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2014-05-19 22:39:42 -0400 |
| commit | 661298358c4c84ffacbc266321227a9b6efc7a3b (patch) | |
| tree | a4f024773fa45a6da097408ecb73741b12ebddec | |
| parent | 431b96bdbe7dc838551efc9959b3bdca780b9368 (diff) | |
| download | go-661298358c4c84ffacbc266321227a9b6efc7a3b.tar.gz go-661298358c4c84ffacbc266321227a9b6efc7a3b.zip | |
cmd/ld: abort if (32-bit) address relocation is negative on amd64.
Update #7980
This CL make the linker abort for the example program. For Go 1.4,
we need to find a general way to handle large memory model programs.
LGTM=dave, josharian, iant
R=iant, dave, josharian
CC=golang-codereviews
https://golang.org/cl/91500046
| -rw-r--r-- | src/cmd/ld/data.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/cmd/ld/data.c b/src/cmd/ld/data.c index 24969db55b..55d020710e 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: |