ld: fix alignment of rodata section

We were not aligning the code size,
so read-only data, which follows in the same
segment, could be arbitrarily misaligned.

Fixes #2506.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5693055

diff --git a/src/cmd/ld/data.c b/src/cmd/ld/data.c
index 397ae83b2383bc20967a7ab8359dc0ed4142dc31..786c10b64d838707d7b86637a3552334c4b790a2 100644 (file)
--- a/src/cmd/ld/data.c
+++ b/src/cmd/ld/data.c
@@ -1023,6 +1023,11 @@ textaddress(void)
                }
                va += sym->size;
        }
+       
+       // Align end of code so that rodata starts aligned.
+       // 128 bytes is likely overkill but definitely cheap.
+       va = rnd(va, 128);
+
        sect->len = va - sect->vaddr;
 }