From: Matthew Dempsky <mdempsky@google.com>
Date: Thu, 28 Aug 2014 00:15:05 +0000 (-0400)
Subject: cmd/{ld,link,objdump}, runtime, debug/gosym: move linker-defined symbols into runtime... 
X-Git-Tag: go1.4beta1~675
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=2c110a11e046920d98fb8b2cb41bfb99a524450b;p=gostls13.git

cmd/{ld,link,objdump}, runtime, debug/gosym: move linker-defined symbols into runtime package

Fixes #8092.

LGTM=rsc
R=iant, rsc
CC=golang-codereviews
https://golang.org/cl/126790043
---

diff --git a/misc/cgo/test/cgo_test.go b/misc/cgo/test/cgo_test.go
index 3c6d5cb59e..3cc83060fc 100644
--- a/misc/cgo/test/cgo_test.go
+++ b/misc/cgo/test/cgo_test.go
@@ -54,5 +54,6 @@ func Test7665(t *testing.T)                { test7665(t) }
 func TestNaming(t *testing.T)              { testNaming(t) }
 func Test7560(t *testing.T)                { test7560(t) }
 func Test5242(t *testing.T)                { test5242(t) }
+func Test8092(t *testing.T)                { test8092(t) }
 
 func BenchmarkCgoCall(b *testing.B) { benchCgoCall(b) }
diff --git a/misc/cgo/test/issue8092.go b/misc/cgo/test/issue8092.go
new file mode 100644
index 0000000000..8a14ce6d7a
--- /dev/null
+++ b/misc/cgo/test/issue8092.go
@@ -0,0 +1,36 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 8092. Test that linker defined symbols (e.g., text, data) don't
+// conflict with C symbols.
+
+package cgotest
+
+/*
+char text[] = "text";
+char data[] = "data";
+char *ctext(void) { return text; }
+char *cdata(void) { return data; }
+*/
+import "C"
+
+import "testing"
+
+func test8092(t *testing.T) {
+	tests := []struct {
+		s    string
+		a, b *C.char
+	}{
+		{"text", &C.text[0], C.ctext()},
+		{"data", &C.data[0], C.cdata()},
+	}
+	for _, test := range tests {
+		if test.a != test.b {
+			t.Errorf("%s: pointer mismatch: %v != %v", test.s, test.a, test.b)
+		}
+		if got := C.GoString(test.a); got != test.s {
+			t.Errorf("%s: points at %#v, want %#v", test.s, got, test.s)
+		}
+	}
+}
diff --git a/src/cmd/ld/data.c b/src/cmd/ld/data.c
index a988e807e6..098403a743 100644
--- a/src/cmd/ld/data.c
+++ b/src/cmd/ld/data.c
@@ -987,8 +987,8 @@ dodata(void)
 	sect->align = maxalign(s, SINITARR-1);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "noptrdata", 0)->sect = sect;
-	linklookup(ctxt, "enoptrdata", 0)->sect = sect;
+	linklookup(ctxt, "runtime.noptrdata", 0)->sect = sect;
+	linklookup(ctxt, "runtime.enoptrdata", 0)->sect = sect;
 	for(; s != nil && s->type < SINITARR; s = s->next) {
 		datsize = aligndatsize(datsize, s);
 		s->sect = sect;
@@ -1018,9 +1018,9 @@ dodata(void)
 	sect->align = maxalign(s, SBSS-1);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "data", 0)->sect = sect;
-	linklookup(ctxt, "edata", 0)->sect = sect;
-	gcdata = linklookup(ctxt, "gcdata", 0);
+	linklookup(ctxt, "runtime.data", 0)->sect = sect;
+	linklookup(ctxt, "runtime.edata", 0)->sect = sect;
+	gcdata = linklookup(ctxt, "runtime.gcdata", 0);
 	proggeninit(&gen, gcdata);
 	for(; s != nil && s->type < SBSS; s = s->next) {
 		if(s->type == SINITARR) {
@@ -1042,9 +1042,9 @@ dodata(void)
 	sect->align = maxalign(s, SNOPTRBSS-1);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "bss", 0)->sect = sect;
-	linklookup(ctxt, "ebss", 0)->sect = sect;
-	gcbss = linklookup(ctxt, "gcbss", 0);
+	linklookup(ctxt, "runtime.bss", 0)->sect = sect;
+	linklookup(ctxt, "runtime.ebss", 0)->sect = sect;
+	gcbss = linklookup(ctxt, "runtime.gcbss", 0);
 	proggeninit(&gen, gcbss);
 	for(; s != nil && s->type < SNOPTRBSS; s = s->next) {
 		s->sect = sect;
@@ -1061,8 +1061,8 @@ dodata(void)
 	sect->align = maxalign(s, SNOPTRBSS);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "noptrbss", 0)->sect = sect;
-	linklookup(ctxt, "enoptrbss", 0)->sect = sect;
+	linklookup(ctxt, "runtime.noptrbss", 0)->sect = sect;
+	linklookup(ctxt, "runtime.enoptrbss", 0)->sect = sect;
 	for(; s != nil && s->type == SNOPTRBSS; s = s->next) {
 		datsize = aligndatsize(datsize, s);
 		s->sect = sect;
@@ -1070,7 +1070,7 @@ dodata(void)
 		growdatsize(&datsize, s);
 	}
 	sect->len = datsize - sect->vaddr;
-	linklookup(ctxt, "end", 0)->sect = sect;
+	linklookup(ctxt, "runtime.end", 0)->sect = sect;
 
 	// 6g uses 4-byte relocation offsets, so the entire segment must fit in 32 bits.
 	if(datsize != (uint32)datsize) {
@@ -1141,8 +1141,8 @@ dodata(void)
 	sect->align = maxalign(s, STYPELINK-1);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = 0;
-	linklookup(ctxt, "rodata", 0)->sect = sect;
-	linklookup(ctxt, "erodata", 0)->sect = sect;
+	linklookup(ctxt, "runtime.rodata", 0)->sect = sect;
+	linklookup(ctxt, "runtime.erodata", 0)->sect = sect;
 	for(; s != nil && s->type < STYPELINK; s = s->next) {
 		datsize = aligndatsize(datsize, s);
 		s->sect = sect;
@@ -1157,8 +1157,8 @@ dodata(void)
 	sect->align = maxalign(s, STYPELINK);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "typelink", 0)->sect = sect;
-	linklookup(ctxt, "etypelink", 0)->sect = sect;
+	linklookup(ctxt, "runtime.typelink", 0)->sect = sect;
+	linklookup(ctxt, "runtime.etypelink", 0)->sect = sect;
 	for(; s != nil && s->type == STYPELINK; s = s->next) {
 		datsize = aligndatsize(datsize, s);
 		s->sect = sect;
@@ -1173,8 +1173,8 @@ dodata(void)
 	sect->align = maxalign(s, SPCLNTAB-1);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "symtab", 0)->sect = sect;
-	linklookup(ctxt, "esymtab", 0)->sect = sect;
+	linklookup(ctxt, "runtime.symtab", 0)->sect = sect;
+	linklookup(ctxt, "runtime.esymtab", 0)->sect = sect;
 	for(; s != nil && s->type < SPCLNTAB; s = s->next) {
 		datsize = aligndatsize(datsize, s);
 		s->sect = sect;
@@ -1189,8 +1189,8 @@ dodata(void)
 	sect->align = maxalign(s, SELFROSECT-1);
 	datsize = rnd(datsize, sect->align);
 	sect->vaddr = datsize;
-	linklookup(ctxt, "pclntab", 0)->sect = sect;
-	linklookup(ctxt, "epclntab", 0)->sect = sect;
+	linklookup(ctxt, "runtime.pclntab", 0)->sect = sect;
+	linklookup(ctxt, "runtime.epclntab", 0)->sect = sect;
 	for(; s != nil && s->type < SELFROSECT; s = s->next) {
 		datsize = aligndatsize(datsize, s);
 		s->sect = sect;
@@ -1243,8 +1243,8 @@ textaddress(void)
 	// and then letting threads copy down, but probably not worth it.
 	sect = segtext.sect;
 	sect->align = funcalign;
-	linklookup(ctxt, "text", 0)->sect = sect;
-	linklookup(ctxt, "etext", 0)->sect = sect;
+	linklookup(ctxt, "runtime.text", 0)->sect = sect;
+	linklookup(ctxt, "runtime.etext", 0)->sect = sect;
 	va = INITTEXT;
 	sect->vaddr = va;
 	for(sym = ctxt->textp; sym != nil; sym = sym->next) {
@@ -1355,32 +1355,32 @@ address(void)
 			sub->value += sym->value;
 	}
 
-	xdefine("text", STEXT, text->vaddr);
-	xdefine("etext", STEXT, text->vaddr + text->len);
-	xdefine("rodata", SRODATA, rodata->vaddr);
-	xdefine("erodata", SRODATA, rodata->vaddr + rodata->len);
-	xdefine("typelink", SRODATA, typelink->vaddr);
-	xdefine("etypelink", SRODATA, typelink->vaddr + typelink->len);
-
-	sym = linklookup(ctxt, "gcdata", 0);
-	xdefine("egcdata", SRODATA, symaddr(sym) + sym->size);
-	linklookup(ctxt, "egcdata", 0)->sect = sym->sect;
-
-	sym = linklookup(ctxt, "gcbss", 0);
-	xdefine("egcbss", SRODATA, symaddr(sym) + sym->size);
-	linklookup(ctxt, "egcbss", 0)->sect = sym->sect;
-
-	xdefine("symtab", SRODATA, symtab->vaddr);
-	xdefine("esymtab", SRODATA, symtab->vaddr + symtab->len);
-	xdefine("pclntab", SRODATA, pclntab->vaddr);
-	xdefine("epclntab", SRODATA, pclntab->vaddr + pclntab->len);
-	xdefine("noptrdata", SNOPTRDATA, noptr->vaddr);
-	xdefine("enoptrdata", SNOPTRDATA, noptr->vaddr + noptr->len);
-	xdefine("bss", SBSS, bss->vaddr);
-	xdefine("ebss", SBSS, bss->vaddr + bss->len);
-	xdefine("data", SDATA, data->vaddr);
-	xdefine("edata", SDATA, data->vaddr + data->len);
-	xdefine("noptrbss", SNOPTRBSS, noptrbss->vaddr);
-	xdefine("enoptrbss", SNOPTRBSS, noptrbss->vaddr + noptrbss->len);
-	xdefine("end", SBSS, segdata.vaddr + segdata.len);
+	xdefine("runtime.text", STEXT, text->vaddr);
+	xdefine("runtime.etext", STEXT, text->vaddr + text->len);
+	xdefine("runtime.rodata", SRODATA, rodata->vaddr);
+	xdefine("runtime.erodata", SRODATA, rodata->vaddr + rodata->len);
+	xdefine("runtime.typelink", SRODATA, typelink->vaddr);
+	xdefine("runtime.etypelink", SRODATA, typelink->vaddr + typelink->len);
+
+	sym = linklookup(ctxt, "runtime.gcdata", 0);
+	xdefine("runtime.egcdata", SRODATA, symaddr(sym) + sym->size);
+	linklookup(ctxt, "runtime.egcdata", 0)->sect = sym->sect;
+
+	sym = linklookup(ctxt, "runtime.gcbss", 0);
+	xdefine("runtime.egcbss", SRODATA, symaddr(sym) + sym->size);
+	linklookup(ctxt, "runtime.egcbss", 0)->sect = sym->sect;
+
+	xdefine("runtime.symtab", SRODATA, symtab->vaddr);
+	xdefine("runtime.esymtab", SRODATA, symtab->vaddr + symtab->len);
+	xdefine("runtime.pclntab", SRODATA, pclntab->vaddr);
+	xdefine("runtime.epclntab", SRODATA, pclntab->vaddr + pclntab->len);
+	xdefine("runtime.noptrdata", SNOPTRDATA, noptr->vaddr);
+	xdefine("runtime.enoptrdata", SNOPTRDATA, noptr->vaddr + noptr->len);
+	xdefine("runtime.bss", SBSS, bss->vaddr);
+	xdefine("runtime.ebss", SBSS, bss->vaddr + bss->len);
+	xdefine("runtime.data", SDATA, data->vaddr);
+	xdefine("runtime.edata", SDATA, data->vaddr + data->len);
+	xdefine("runtime.noptrbss", SNOPTRBSS, noptrbss->vaddr);
+	xdefine("runtime.enoptrbss", SNOPTRBSS, noptrbss->vaddr + noptrbss->len);
+	xdefine("runtime.end", SBSS, segdata.vaddr + segdata.len);
 }
diff --git a/src/cmd/ld/lib.c b/src/cmd/ld/lib.c
index 0a5d8d99f2..a68993715d 100644
--- a/src/cmd/ld/lib.c
+++ b/src/cmd/ld/lib.c
@@ -1349,10 +1349,10 @@ genasmsym(void (*put)(LSym*, char*, int, vlong, vlong, int, LSym*))
 
 	// These symbols won't show up in the first loop below because we
 	// skip STEXT symbols. Normal STEXT symbols are emitted by walking textp.
-	s = linklookup(ctxt, "text", 0);
+	s = linklookup(ctxt, "runtime.text", 0);
 	if(s->type == STEXT)
 		put(s, s->name, 'T', s->value, s->size, s->version, 0);
-	s = linklookup(ctxt, "etext", 0);
+	s = linklookup(ctxt, "runtime.etext", 0);
 	if(s->type == STEXT)
 		put(s, s->name, 'T', s->value, s->size, s->version, 0);
 
diff --git a/src/cmd/ld/pcln.c b/src/cmd/ld/pcln.c
index 17f4f992fc..3cd9e65dad 100644
--- a/src/cmd/ld/pcln.c
+++ b/src/cmd/ld/pcln.c
@@ -119,7 +119,7 @@ pclntab(void)
 	static Pcln zpcln;
 	
 	funcdata_bytes = 0;
-	ftab = linklookup(ctxt, "pclntab", 0);
+	ftab = linklookup(ctxt, "runtime.pclntab", 0);
 	ftab->type = SPCLNTAB;
 	ftab->reachable = 1;
 
diff --git a/src/cmd/ld/symtab.c b/src/cmd/ld/symtab.c
index 1805f97d3a..156270c8fa 100644
--- a/src/cmd/ld/symtab.c
+++ b/src/cmd/ld/symtab.c
@@ -346,36 +346,36 @@ symtab(void)
 
 	// Define these so that they'll get put into the symbol table.
 	// data.c:/^address will provide the actual values.
-	xdefine("text", STEXT, 0);
-	xdefine("etext", STEXT, 0);
-	xdefine("typelink", SRODATA, 0);
-	xdefine("etypelink", SRODATA, 0);
-	xdefine("rodata", SRODATA, 0);
-	xdefine("erodata", SRODATA, 0);
-	xdefine("noptrdata", SNOPTRDATA, 0);
-	xdefine("enoptrdata", SNOPTRDATA, 0);
-	xdefine("data", SDATA, 0);
-	xdefine("edata", SDATA, 0);
-	xdefine("bss", SBSS, 0);
-	xdefine("ebss", SBSS, 0);
-	xdefine("noptrbss", SNOPTRBSS, 0);
-	xdefine("enoptrbss", SNOPTRBSS, 0);
-	xdefine("end", SBSS, 0);
-	xdefine("epclntab", SRODATA, 0);
-	xdefine("esymtab", SRODATA, 0);
+	xdefine("runtime.text", STEXT, 0);
+	xdefine("runtime.etext", STEXT, 0);
+	xdefine("runtime.typelink", SRODATA, 0);
+	xdefine("runtime.etypelink", SRODATA, 0);
+	xdefine("runtime.rodata", SRODATA, 0);
+	xdefine("runtime.erodata", SRODATA, 0);
+	xdefine("runtime.noptrdata", SNOPTRDATA, 0);
+	xdefine("runtime.enoptrdata", SNOPTRDATA, 0);
+	xdefine("runtime.data", SDATA, 0);
+	xdefine("runtime.edata", SDATA, 0);
+	xdefine("runtime.bss", SBSS, 0);
+	xdefine("runtime.ebss", SBSS, 0);
+	xdefine("runtime.noptrbss", SNOPTRBSS, 0);
+	xdefine("runtime.enoptrbss", SNOPTRBSS, 0);
+	xdefine("runtime.end", SBSS, 0);
+	xdefine("runtime.epclntab", SRODATA, 0);
+	xdefine("runtime.esymtab", SRODATA, 0);
 
 	// garbage collection symbols
-	s = linklookup(ctxt, "gcdata", 0);
+	s = linklookup(ctxt, "runtime.gcdata", 0);
 	s->type = SRODATA;
 	s->size = 0;
 	s->reachable = 1;
-	xdefine("egcdata", SRODATA, 0);
+	xdefine("runtime.egcdata", SRODATA, 0);
 
-	s = linklookup(ctxt, "gcbss", 0);
+	s = linklookup(ctxt, "runtime.gcbss", 0);
 	s->type = SRODATA;
 	s->size = 0;
 	s->reachable = 1;
-	xdefine("egcbss", SRODATA, 0);
+	xdefine("runtime.egcbss", SRODATA, 0);
 
 	// pseudo-symbols to mark locations of type, string, and go string data.
 	s = linklookup(ctxt, "type.*", 0);
@@ -396,9 +396,9 @@ symtab(void)
 	s->reachable = 1;
 	symgofunc = s;
 	
-	symtypelink = linklookup(ctxt, "typelink", 0);
+	symtypelink = linklookup(ctxt, "runtime.typelink", 0);
 
-	symt = linklookup(ctxt, "symtab", 0);
+	symt = linklookup(ctxt, "runtime.symtab", 0);
 	symt->type = SSYMTAB;
 	symt->size = 0;
 	symt->reachable = 1;
diff --git a/src/cmd/link/auto.go b/src/cmd/link/auto.go
index 8f0c39f8c0..f9228e8cab 100644
--- a/src/cmd/link/auto.go
+++ b/src/cmd/link/auto.go
@@ -18,26 +18,26 @@ import (
 // linkerDefined lists the symbols supplied by other parts of the linker
 // (runtime.go and layout.go).
 var linkerDefined = map[string]bool{
-	"bss":        true,
-	"data":       true,
-	"ebss":       true,
-	"edata":      true,
-	"efunctab":   true,
-	"end":        true,
-	"enoptrbss":  true,
-	"enoptrdata": true,
-	"erodata":    true,
-	"etext":      true,
-	"etypelink":  true,
-	"functab":    true,
-	"gcbss":      true,
-	"gcdata":     true,
-	"noptrbss":   true,
-	"noptrdata":  true,
-	"pclntab":    true,
-	"rodata":     true,
-	"text":       true,
-	"typelink":   true,
+	"runtime.bss":        true,
+	"runtime.data":       true,
+	"runtime.ebss":       true,
+	"runtime.edata":      true,
+	"runtime.efunctab":   true,
+	"runtime.end":        true,
+	"runtime.enoptrbss":  true,
+	"runtime.enoptrdata": true,
+	"runtime.erodata":    true,
+	"runtime.etext":      true,
+	"runtime.etypelink":  true,
+	"runtime.functab":    true,
+	"runtime.gcbss":      true,
+	"runtime.gcdata":     true,
+	"runtime.noptrbss":   true,
+	"runtime.noptrdata":  true,
+	"runtime.pclntab":    true,
+	"runtime.rodata":     true,
+	"runtime.text":       true,
+	"runtime.typelink":   true,
 }
 
 // isAuto reports whether sym is an automatically-generated data or constant symbol.
diff --git a/src/cmd/link/layout.go b/src/cmd/link/layout.go
index 6477022444..149ebced0f 100644
--- a/src/cmd/link/layout.go
+++ b/src/cmd/link/layout.go
@@ -172,9 +172,9 @@ func (p *Prog) layout() {
 			start = sect.VirtAddr
 			end = sect.VirtAddr + sect.Size
 		}
-		p.defineConst(name, start)
-		p.defineConst("e"+name, end)
+		p.defineConst("runtime."+name, start)
+		p.defineConst("runtime.e"+name, end)
 		progEnd = end
 	}
-	p.defineConst("end", progEnd)
+	p.defineConst("runtime.end", progEnd)
 }
diff --git a/src/cmd/link/pclntab.go b/src/cmd/link/pclntab.go
index a950895aa5..232d586bf2 100644
--- a/src/cmd/link/pclntab.go
+++ b/src/cmd/link/pclntab.go
@@ -183,7 +183,7 @@ func (p *Prog) pclntab() {
 
 	pclntab := &Sym{
 		Sym: &goobj.Sym{
-			SymID: goobj.SymID{Name: "pclntab"},
+			SymID: goobj.SymID{Name: "runtime.pclntab"},
 			Kind:  goobj.SPCLNTAB,
 			Size:  buf.Size(),
 			Reloc: buf.Reloc(),
diff --git a/src/cmd/link/pclntab_test.go b/src/cmd/link/pclntab_test.go
index 75d432fc5d..19953f5797 100644
--- a/src/cmd/link/pclntab_test.go
+++ b/src/cmd/link/pclntab_test.go
@@ -141,7 +141,7 @@ func TestPclntab(t *testing.T) {
 // It returns a symbol reader for pclntab, the offset of the function information
 // within that symbol, and the args and frame values read out of the information.
 func findFunc(t *testing.T, p *Prog, name string) (r *SymReader, off, args, frame int, ok bool) {
-	tabsym := p.Syms[goobj.SymID{Name: "pclntab"}]
+	tabsym := p.Syms[goobj.SymID{Name: "runtime.pclntab"}]
 	if tabsym == nil {
 		t.Errorf("pclntab is missing in binary")
 		return
diff --git a/src/cmd/link/runtime.go b/src/cmd/link/runtime.go
index 5d37015eb1..b0c1ac98a6 100644
--- a/src/cmd/link/runtime.go
+++ b/src/cmd/link/runtime.go
@@ -15,13 +15,13 @@ func (p *Prog) runtime() {
 	// TODO: Implement garbage collection data.
 	p.addSym(&Sym{
 		Sym: &goobj.Sym{
-			SymID: goobj.SymID{Name: "gcdata"},
+			SymID: goobj.SymID{Name: "runtime.gcdata"},
 			Kind:  goobj.SRODATA,
 		},
 	})
 	p.addSym(&Sym{
 		Sym: &goobj.Sym{
-			SymID: goobj.SymID{Name: "gcbss"},
+			SymID: goobj.SymID{Name: "runtime.gcbss"},
 			Kind:  goobj.SRODATA,
 		},
 	})
diff --git a/src/cmd/link/testdata/autosection.6 b/src/cmd/link/testdata/autosection.6
index 97e8872bd8..386f422cf3 100644
Binary files a/src/cmd/link/testdata/autosection.6 and b/src/cmd/link/testdata/autosection.6 differ
diff --git a/src/cmd/link/testdata/autosection.s b/src/cmd/link/testdata/autosection.s
index fd9e94da4e..e0cb21723e 100644
--- a/src/cmd/link/testdata/autosection.s
+++ b/src/cmd/link/testdata/autosection.s
@@ -16,37 +16,37 @@ GLOBL zero(SB), $8
 GLOBL zeronoptr(SB), NOPTR, $16
 
 // text
-DATA autotab+0x00(SB)/8, $text(SB)
+DATA autotab+0x00(SB)/8, $runtime·text(SB)
 DATA autotab+0x08(SB)/8, $start(SB)
-DATA autotab+0x10(SB)/8, $etext(SB)
+DATA autotab+0x10(SB)/8, $runtime·etext(SB)
 DATA autotab+0x18(SB)/8, $start+16(SB)
 
 // data
-DATA autotab+0x20(SB)/8, $data(SB)
+DATA autotab+0x20(SB)/8, $runtime·data(SB)
 DATA autotab+0x28(SB)/8, $autotab(SB)
-DATA autotab+0x30(SB)/8, $edata(SB)
+DATA autotab+0x30(SB)/8, $runtime·edata(SB)
 DATA autotab+0x38(SB)/8, $nonzero+4(SB)
 
 // bss
-DATA autotab+0x40(SB)/8, $bss(SB)
+DATA autotab+0x40(SB)/8, $runtime·bss(SB)
 DATA autotab+0x48(SB)/8, $zero(SB)
-DATA autotab+0x50(SB)/8, $ebss(SB)
+DATA autotab+0x50(SB)/8, $runtime·ebss(SB)
 DATA autotab+0x58(SB)/8, $zero+8(SB)
 
 // noptrdata
-DATA autotab+0x60(SB)/8, $noptrdata(SB)
+DATA autotab+0x60(SB)/8, $runtime·noptrdata(SB)
 DATA autotab+0x68(SB)/8, $nonzeronoptr(SB)
-DATA autotab+0x70(SB)/8, $enoptrdata(SB)
+DATA autotab+0x70(SB)/8, $runtime·enoptrdata(SB)
 DATA autotab+0x78(SB)/8, $nonzeronoptr+8(SB)
 
 // noptrbss
-DATA autotab+0x80(SB)/8, $noptrbss(SB)
+DATA autotab+0x80(SB)/8, $runtime·noptrbss(SB)
 DATA autotab+0x88(SB)/8, $zeronoptr(SB)
-DATA autotab+0x90(SB)/8, $enoptrbss(SB)
+DATA autotab+0x90(SB)/8, $runtime·enoptrbss(SB)
 DATA autotab+0x98(SB)/8, $zeronoptr+16(SB)
 
 // end
-DATA autotab+0xa0(SB)/8, $end(SB)
+DATA autotab+0xa0(SB)/8, $runtime·end(SB)
 DATA autotab+0xa8(SB)/8, $zeronoptr+16(SB)
 
 GLOBL autotab(SB), $0xb0
diff --git a/src/cmd/link/testdata/dead.6 b/src/cmd/link/testdata/dead.6
index c60b1b6c64..9540adc1af 100644
Binary files a/src/cmd/link/testdata/dead.6 and b/src/cmd/link/testdata/dead.6 differ
diff --git a/src/cmd/link/testdata/dead.s b/src/cmd/link/testdata/dead.s
index 832ddaff60..86f31360fa 100644
--- a/src/cmd/link/testdata/dead.s
+++ b/src/cmd/link/testdata/dead.s
@@ -17,7 +17,7 @@ TEXT text1(SB),7,$0
 	RET
 
 TEXT text2(SB),7,$0
-	MOVQ $edata(SB),BX
+	MOVQ $runtime·edata(SB),BX
 	RET
 
 DATA data1<>+0(SB)/8, $data2(SB)
@@ -46,4 +46,3 @@ GLOBL dead_data1(SB), $16
 GLOBL dead_data2(SB), $1
 GLOBL dead_data3(SB), $1
 GLOBL dead_funcdata(SB), $8
-
diff --git a/src/cmd/link/testdata/genpcln.go b/src/cmd/link/testdata/genpcln.go
index 684cc07a27..c10eaeae91 100644
--- a/src/cmd/link/testdata/genpcln.go
+++ b/src/cmd/link/testdata/genpcln.go
@@ -107,6 +107,6 @@ func main() {
 	for f := 0; f < 3; f++ {
 		fmt.Printf("\tCALL func%d(SB)\n", f)
 	}
-	fmt.Printf("\tMOVQ $pclntab(SB), AX\n")
+	fmt.Printf("\tMOVQ $runtime·pclntab(SB), AX\n")
 	fmt.Printf("\n\tRET\n")
 }
diff --git a/src/cmd/link/testdata/pclntab.6 b/src/cmd/link/testdata/pclntab.6
index 596daa9b57..9e7f9afdb0 100644
Binary files a/src/cmd/link/testdata/pclntab.6 and b/src/cmd/link/testdata/pclntab.6 differ
diff --git a/src/cmd/link/testdata/pclntab.s b/src/cmd/link/testdata/pclntab.s
index 22c4ee0dec..12dac70b0c 100644
--- a/src/cmd/link/testdata/pclntab.s
+++ b/src/cmd/link/testdata/pclntab.s
@@ -1746,6 +1746,6 @@ TEXT start(SB),7,$0
 	CALL func0(SB)
 	CALL func1(SB)
 	CALL func2(SB)
-	MOVQ $pclntab(SB), AX
+	MOVQ $runtime·pclntab(SB), AX
 
 	RET
diff --git a/src/cmd/objdump/main.go b/src/cmd/objdump/main.go
index 9922dcc023..42f015be70 100644
--- a/src/cmd/objdump/main.go
+++ b/src/cmd/objdump/main.go
@@ -101,7 +101,7 @@ func main() {
 	keep := syms[:0]
 	for _, sym := range syms {
 		switch sym.Name {
-		case "text", "_text", "etext", "_etext":
+		case "runtime.text", "text", "_text", "runtime.etext", "etext", "_etext":
 			// drop
 		default:
 			keep = append(keep, sym)
@@ -118,7 +118,7 @@ func main() {
 		i := sort.Search(len(syms), func(i int) bool { return syms[i].Addr > addr })
 		if i > 0 {
 			s := syms[i-1]
-			if s.Addr <= addr && addr < s.Addr+uint64(s.Size) && s.Name != "etext" && s.Name != "_etext" {
+			if s.Addr <= addr && addr < s.Addr+uint64(s.Size) && s.Name != "runtime.etext" && s.Name != "etext" && s.Name != "_etext" {
 				return s.Name, s.Addr
 			}
 		}
diff --git a/src/pkg/debug/gosym/symtab.go b/src/pkg/debug/gosym/symtab.go
index 3864e3cb4f..ee18499d11 100644
--- a/src/pkg/debug/gosym/symtab.go
+++ b/src/pkg/debug/gosym/symtab.go
@@ -402,7 +402,7 @@ func NewTable(symtab []byte, pcln *LineTable) (*Table, error) {
 			if n := len(t.Funcs); n > 0 {
 				t.Funcs[n-1].End = sym.Value
 			}
-			if sym.Name == "etext" {
+			if sym.Name == "runtime.etext" || sym.Name == "etext" {
 				continue
 			}
 
diff --git a/src/pkg/runtime/heapdump.c b/src/pkg/runtime/heapdump.c
index ea299d0a2e..09d109199b 100644
--- a/src/pkg/runtime/heapdump.c
+++ b/src/pkg/runtime/heapdump.c
@@ -19,10 +19,10 @@
 #include "zaexperiment.h"
 #include "../../cmd/ld/textflag.h"
 
-extern byte data[];
-extern byte edata[];
-extern byte bss[];
-extern byte ebss[];
+extern byte runtime·data[];
+extern byte runtime·edata[];
+extern byte runtime·bss[];
+extern byte runtime·ebss[];
 
 enum {
 	FieldKindEol = 0,
@@ -487,14 +487,14 @@ dumproots(void)
 
 	// data segment
 	dumpint(TagData);
-	dumpint((uintptr)data);
-	dumpmemrange(data, edata - data);
+	dumpint((uintptr)runtime·data);
+	dumpmemrange(runtime·data, runtime·edata - runtime·data);
 	dumpfields(runtime·gcdatamask);
 
 	// bss segment
 	dumpint(TagBss);
-	dumpint((uintptr)bss);
-	dumpmemrange(bss, ebss - bss);
+	dumpint((uintptr)runtime·bss);
+	dumpmemrange(runtime·bss, runtime·ebss - runtime·bss);
 	dumpfields(runtime·gcdatamask);
 
 	// MSpan.types
diff --git a/src/pkg/runtime/malloc.c b/src/pkg/runtime/malloc.c
index ca8ebf5dd6..913d8ac26b 100644
--- a/src/pkg/runtime/malloc.c
+++ b/src/pkg/runtime/malloc.c
@@ -125,7 +125,7 @@ runtime·mallocinit(void)
 {
 	byte *p, *p1;
 	uintptr arena_size, bitmap_size, spans_size, p_size;
-	extern byte end[];
+	extern byte runtime·end[];
 	uintptr limit;
 	uint64 i;
 	bool reserved;
@@ -232,7 +232,7 @@ runtime·mallocinit(void)
 		// So adjust it upward a little bit ourselves: 1/4 MB to get
 		// away from the running binary image and then round up
 		// to a MB boundary.
-		p = (byte*)ROUND((uintptr)end + (1<<18), 1<<20);
+		p = (byte*)ROUND((uintptr)runtime·end + (1<<18), 1<<20);
 		p_size = bitmap_size + spans_size + arena_size + PageSize;
 		p = runtime·SysReserve(p, p_size, &reserved);
 		if(p == nil)
diff --git a/src/pkg/runtime/mem_plan9.c b/src/pkg/runtime/mem_plan9.c
index ea35a1709c..249c6f2255 100644
--- a/src/pkg/runtime/mem_plan9.c
+++ b/src/pkg/runtime/mem_plan9.c
@@ -8,8 +8,8 @@
 #include "malloc.h"
 #include "os_GOOS.h"
 
-extern byte end[];
-static byte *bloc = { end };
+extern byte runtime·end[];
+static byte *bloc = { runtime·end };
 static Lock memlock;
 
 enum
diff --git a/src/pkg/runtime/mgc0.c b/src/pkg/runtime/mgc0.c
index 61961f6471..68e45a316e 100644
--- a/src/pkg/runtime/mgc0.c
+++ b/src/pkg/runtime/mgc0.c
@@ -158,13 +158,13 @@ struct FinBlock
 	Finalizer fin[1];
 };
 
-extern byte data[];
-extern byte edata[];
-extern byte bss[];
-extern byte ebss[];
+extern byte runtime·data[];
+extern byte runtime·edata[];
+extern byte runtime·bss[];
+extern byte runtime·ebss[];
 
-extern byte gcdata[];
-extern byte gcbss[];
+extern byte runtime·gcdata[];
+extern byte runtime·gcbss[];
 
 static Lock	finlock;	// protects the following variables
 static FinBlock	*finq;		// list of finalizers that are to be executed
@@ -490,11 +490,11 @@ markroot(ParFor *desc, uint32 i)
 	// Note: if you add a case here, please also update heapdump.c:dumproots.
 	switch(i) {
 	case RootData:
-		scanblock(data, edata - data, (byte*)runtime·gcdatamask.data);
+		scanblock(runtime·data, runtime·edata - runtime·data, (byte*)runtime·gcdatamask.data);
 		break;
 
 	case RootBss:
-		scanblock(bss, ebss - bss, (byte*)runtime·gcbssmask.data);
+		scanblock(runtime·bss, runtime·ebss - runtime·bss, (byte*)runtime·gcbssmask.data);
 		break;
 
 	case RootFinalizers:
@@ -1300,8 +1300,8 @@ runtime·gcinit(void)
 
 	work.markfor = runtime·parforalloc(MaxGcproc);
 	runtime·gcpercent = runtime·readgogc();
-	runtime·gcdatamask = unrollglobgcprog(gcdata, edata - data);
-	runtime·gcbssmask = unrollglobgcprog(gcbss, ebss - bss);
+	runtime·gcdatamask = unrollglobgcprog(runtime·gcdata, runtime·edata - runtime·data);
+	runtime·gcbssmask = unrollglobgcprog(runtime·gcbss, runtime·ebss - runtime·bss);
 }
 
 // force = 1 - do GC regardless of current heap usage
@@ -2035,24 +2035,24 @@ runtime·getgcmask(byte *p, Type *t, byte **mask, uintptr *len)
 	*len = 0;
 
 	// data
-	if(p >= data && p < edata) {
+	if(p >= runtime·data && p < runtime·edata) {
 		n = ((PtrType*)t)->elem->size;
 		*len = n/PtrSize;
 		*mask = runtime·mallocgc(*len, nil, 0);
 		for(i = 0; i < n; i += PtrSize) {
-			off = (p+i-data)/PtrSize;
+			off = (p+i-runtime·data)/PtrSize;
 			bits = (((byte*)runtime·gcdatamask.data)[off/PointersPerByte] >> ((off%PointersPerByte)*BitsPerPointer))&BitsMask;
 			(*mask)[i/PtrSize] = bits;
 		}
 		return;
 	}
 	// bss
-	if(p >= bss && p < ebss) {
+	if(p >= runtime·bss && p < runtime·ebss) {
 		n = ((PtrType*)t)->elem->size;
 		*len = n/PtrSize;
 		*mask = runtime·mallocgc(*len, nil, 0);
 		for(i = 0; i < n; i += PtrSize) {
-			off = (p+i-bss)/PtrSize;
+			off = (p+i-runtime·bss)/PtrSize;
 			bits = (((byte*)runtime·gcbssmask.data)[off/PointersPerByte] >> ((off%PointersPerByte)*BitsPerPointer))&BitsMask;
 			(*mask)[i/PtrSize] = bits;
 		}
diff --git a/src/pkg/runtime/os_dragonfly.c b/src/pkg/runtime/os_dragonfly.c
index ce5307af07..1132f5741d 100644
--- a/src/pkg/runtime/os_dragonfly.c
+++ b/src/pkg/runtime/os_dragonfly.c
@@ -207,7 +207,7 @@ uintptr
 runtime·memlimit(void)
 {
 	Rlimit rl;
-	extern byte text[], end[];
+	extern byte runtime·text[], runtime·end[];
 	uintptr used;
 	
 	if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
@@ -218,7 +218,7 @@ runtime·memlimit(void)
 	// Estimate our VM footprint excluding the heap.
 	// Not an exact science: use size of binary plus
 	// some room for thread stacks.
-	used = end - text + (64<<20);
+	used = runtime·end - runtime·text + (64<<20);
 	if(used >= rl.rlim_cur)
 		return 0;
 
diff --git a/src/pkg/runtime/os_freebsd.c b/src/pkg/runtime/os_freebsd.c
index 794578c208..20f71c41e8 100644
--- a/src/pkg/runtime/os_freebsd.c
+++ b/src/pkg/runtime/os_freebsd.c
@@ -215,7 +215,7 @@ uintptr
 runtime·memlimit(void)
 {
 	Rlimit rl;
-	extern byte text[], end[];
+	extern byte runtime·text[], runtime·end[];
 	uintptr used;
 	
 	if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
@@ -226,7 +226,7 @@ runtime·memlimit(void)
 	// Estimate our VM footprint excluding the heap.
 	// Not an exact science: use size of binary plus
 	// some room for thread stacks.
-	used = end - text + (64<<20);
+	used = runtime·end - runtime·text + (64<<20);
 	if(used >= rl.rlim_cur)
 		return 0;
 
diff --git a/src/pkg/runtime/os_linux.c b/src/pkg/runtime/os_linux.c
index 77754f481c..33c7563743 100644
--- a/src/pkg/runtime/os_linux.c
+++ b/src/pkg/runtime/os_linux.c
@@ -255,7 +255,7 @@ uintptr
 runtime·memlimit(void)
 {
 	Rlimit rl;
-	extern byte text[], end[];
+	extern byte runtime·text[], runtime·end[];
 	uintptr used;
 
 	if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
@@ -266,7 +266,7 @@ runtime·memlimit(void)
 	// Estimate our VM footprint excluding the heap.
 	// Not an exact science: use size of binary plus
 	// some room for thread stacks.
-	used = end - text + (64<<20);
+	used = runtime·end - runtime·text + (64<<20);
 	if(used >= rl.rlim_cur)
 		return 0;
 
diff --git a/src/pkg/runtime/os_solaris.c b/src/pkg/runtime/os_solaris.c
index fe218cdb81..272e07cdb5 100644
--- a/src/pkg/runtime/os_solaris.c
+++ b/src/pkg/runtime/os_solaris.c
@@ -9,9 +9,9 @@
 #include "stack.h"
 #include "../../cmd/ld/textflag.h"
 
-#pragma dynexport end _end
-#pragma dynexport etext _etext
-#pragma dynexport edata _edata
+#pragma dynexport runtime·end _end
+#pragma dynexport runtime·etext _etext
+#pragma dynexport runtime·edata _edata
 
 #pragma dynimport libc·___errno ___errno "libc.so"
 #pragma dynimport libc·clock_gettime clock_gettime "libc.so"
@@ -247,7 +247,7 @@ uintptr
 runtime·memlimit(void)
 {
 	Rlimit rl;
-	extern byte text[], end[];
+	extern byte runtime·text[], runtime·end[];
 	uintptr used;
 	
 	if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
@@ -258,7 +258,7 @@ runtime·memlimit(void)
 	// Estimate our VM footprint excluding the heap.
 	// Not an exact science: use size of binary plus
 	// some room for thread stacks.
-	used = end - text + (64<<20);
+	used = runtime·end - runtime·text + (64<<20);
 	if(used >= rl.rlim_cur)
 		return 0;
 
diff --git a/src/pkg/runtime/os_windows_386.c b/src/pkg/runtime/os_windows_386.c
index 02bc81adbf..15a5ea5d1f 100644
--- a/src/pkg/runtime/os_windows_386.c
+++ b/src/pkg/runtime/os_windows_386.c
@@ -34,7 +34,7 @@ runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
 {
 	bool crash;
 	uintptr *sp;
-	extern byte text[], etext[];
+	extern byte runtime·text[], runtime·etext[];
 
 	if(info->ExceptionCode == DBG_PRINTEXCEPTION_C) {
 		// This exception is intended to be caught by debuggers.
@@ -51,7 +51,7 @@ runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
 
 	// Only handle exception if executing instructions in Go binary
 	// (not Windows library code). 
-	if(r->Eip < (uint32)text || (uint32)etext < r->Eip)
+	if(r->Eip < (uint32)runtime·text || (uint32)runtime·etext < r->Eip)
 		return 0;
 
 	switch(info->ExceptionCode) {
diff --git a/src/pkg/runtime/os_windows_amd64.c b/src/pkg/runtime/os_windows_amd64.c
index a7acf1d786..9a69d73c07 100644
--- a/src/pkg/runtime/os_windows_amd64.c
+++ b/src/pkg/runtime/os_windows_amd64.c
@@ -42,7 +42,7 @@ runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
 {
 	bool crash;
 	uintptr *sp;
-	extern byte text[], etext[];
+	extern byte runtime·text[], runtime·etext[];
 
 	if(info->ExceptionCode == DBG_PRINTEXCEPTION_C) {
 		// This exception is intended to be caught by debuggers.
@@ -59,7 +59,7 @@ runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
 
 	// Only handle exception if executing instructions in Go binary
 	// (not Windows library code). 
-	if(r->Rip < (uint64)text || (uint64)etext < r->Rip)
+	if(r->Rip < (uint64)runtime·text || (uint64)runtime·etext < r->Rip)
 		return 0;
 
 	switch(info->ExceptionCode) {
diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 756f86bd99..a692dfd2cf 100644
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -2407,7 +2407,7 @@ static struct {
 static void System(void) {}
 static void ExternalCode(void) {}
 static void GC(void) {}
-extern byte etext[];
+extern byte runtime·etext[];
 
 // Called if we receive a SIGPROF signal.
 void
@@ -2532,7 +2532,7 @@ runtime·sigprof(uint8 *pc, uint8 *sp, uint8 *lr, G *gp, M *mp)
 			// If all of the above has failed, account it against abstract "System" or "GC".
 			n = 2;
 			// "ExternalCode" is better than "etext".
-			if((uintptr)pc > (uintptr)etext)
+			if((uintptr)pc > (uintptr)runtime·etext)
 				pc = (byte*)ExternalCode + PCQuantum;
 			stk[0] = (uintptr)pc;
 			if(mp->gcing || mp->helpgc)
diff --git a/src/pkg/runtime/race.c b/src/pkg/runtime/race.c
index 6a4d2803c1..07623be1aa 100644
--- a/src/pkg/runtime/race.c
+++ b/src/pkg/runtime/race.c
@@ -47,8 +47,8 @@ void __tsan_release_merge(void);
 #pragma cgo_import_static __tsan_func_enter
 #pragma cgo_import_static __tsan_func_exit
 
-extern byte noptrdata[];
-extern byte enoptrbss[];
+extern byte runtime·noptrdata[];
+extern byte runtime·enoptrbss[];
   
 // start/end of heap for race_amd64.s
 uintptr runtime·racearenastart;
@@ -70,7 +70,7 @@ isvalidaddr(uintptr addr)
 {
 	if(addr >= runtime·racearenastart && addr < runtime·racearenaend)
 		return true;
-	if(addr >= (uintptr)noptrdata && addr < (uintptr)enoptrbss)
+	if(addr >= (uintptr)runtime·noptrdata && addr < (uintptr)runtime·enoptrbss)
 		return true;
 	return false;
 }
@@ -85,8 +85,8 @@ runtime·raceinit(void)
 		runtime·throw("raceinit: race build must use cgo");
 	runtime·racecall(__tsan_init, &racectx, runtime·racesymbolizethunk);
 	// Round data segment to page boundaries, because it's used in mmap().
-	start = (uintptr)noptrdata & ~(PageSize-1);
-	size = ROUND((uintptr)enoptrbss - start, PageSize);
+	start = (uintptr)runtime·noptrdata & ~(PageSize-1);
+	size = ROUND((uintptr)runtime·enoptrbss - start, PageSize);
 	runtime·racecall(__tsan_map_shadow, start, size);
 	return racectx;
 }
diff --git a/src/pkg/runtime/race_amd64.s b/src/pkg/runtime/race_amd64.s
index 30281d224b..f4e72386d8 100644
--- a/src/pkg/runtime/race_amd64.s
+++ b/src/pkg/runtime/race_amd64.s
@@ -144,10 +144,10 @@ TEXT	racecalladdr<>(SB), NOSPLIT, $0-0
 	CMPQ	RARG1, runtime·racearenaend(SB)
 	JB	racecalladdr_call
 racecalladdr_data:
-	MOVQ	$noptrdata(SB), R13
+	MOVQ	$runtime·noptrdata(SB), R13
 	CMPQ	RARG1, R13
 	JB	racecalladdr_ret
-	MOVQ	$enoptrbss(SB), R13
+	MOVQ	$runtime·enoptrbss(SB), R13
 	CMPQ	RARG1, R13
 	JAE	racecalladdr_ret
 racecalladdr_call:
diff --git a/src/pkg/runtime/stubs.goc b/src/pkg/runtime/stubs.goc
index b30c40286c..1cda75e395 100644
--- a/src/pkg/runtime/stubs.goc
+++ b/src/pkg/runtime/stubs.goc
@@ -123,8 +123,8 @@ func gopersistentalloc(size uintptr) (x *void) {
 
 #pragma textflag NOSPLIT
 func reflect·typelinks() (ret Slice) {
-        extern Type *typelink[], *etypelink[];
-        ret.array = (byte*)typelink;
-        ret.len = etypelink - typelink;
+        extern Type *runtime·typelink[], *runtime·etypelink[];
+        ret.array = (byte*)runtime·typelink;
+        ret.len = runtime·etypelink - runtime·typelink;
         ret.cap = ret.len;
 }
diff --git a/src/pkg/runtime/symtab.c b/src/pkg/runtime/symtab.c
index 613aa942ed..802ad5da38 100644
--- a/src/pkg/runtime/symtab.c
+++ b/src/pkg/runtime/symtab.c
@@ -19,15 +19,15 @@ struct Ftab
 	uintptr	funcoff;
 };
 
-extern byte pclntab[];
-extern byte epclntab[];
+extern byte runtime·pclntab[];
+extern byte runtime·epclntab[];
 
 static Ftab *ftab;
 static uintptr runtime·nftab;
 static uint32 *filetab;
 static uint32 runtime·nfiletab;
 
-extern Slice runtime·pclntab;
+extern Slice runtime·pclntable;
 extern Slice runtime·ftabs;
 extern Slice runtime·filetab;
 extern uint32 runtime·pcquantum;
@@ -43,33 +43,33 @@ runtime·symtabinit(void)
 	// See golang.org/s/go12symtab for header: 0xfffffffb,
 	// two zero bytes, a byte giving the PC quantum,
 	// and a byte giving the pointer width in bytes.
-	if(*(uint32*)pclntab != 0xfffffffb || pclntab[4] != 0 || pclntab[5] != 0 || pclntab[6] != PCQuantum || pclntab[7] != sizeof(void*)) {
-		runtime·printf("runtime: function symbol table header: %x %x\n", *(uint32*)pclntab, *(uint32*)(pclntab+4));
+	if(*(uint32*)runtime·pclntab != 0xfffffffb || runtime·pclntab[4] != 0 || runtime·pclntab[5] != 0 || runtime·pclntab[6] != PCQuantum || runtime·pclntab[7] != sizeof(void*)) {
+		runtime·printf("runtime: function symbol table header: %x %x\n", *(uint32*)runtime·pclntab, *(uint32*)(runtime·pclntab+4));
 		runtime·throw("invalid function symbol table\n");
 	}
 
-	runtime·nftab = *(uintptr*)(pclntab+8);
-	ftab = (Ftab*)(pclntab+8+sizeof(void*));
+	runtime·nftab = *(uintptr*)(runtime·pclntab+8);
+	ftab = (Ftab*)(runtime·pclntab+8+sizeof(void*));
 	for(i=0; i<runtime·nftab; i++) {
 		// NOTE: ftab[runtime·nftab].entry is legal; it is the address beyond the final function.
 		if(ftab[i].entry > ftab[i+1].entry) {
-			f1 = (Func*)(pclntab + ftab[i].funcoff);
-			f2 = (Func*)(pclntab + ftab[i+1].funcoff);
+			f1 = (Func*)(runtime·pclntab + ftab[i].funcoff);
+			f2 = (Func*)(runtime·pclntab + ftab[i+1].funcoff);
 			runtime·printf("function symbol table not sorted by program counter: %p %s > %p %s", ftab[i].entry, runtime·funcname(f1), ftab[i+1].entry, i+1 == runtime·nftab ? "end" : runtime·funcname(f2));
 			for(j=0; j<=i; j++)
-				runtime·printf("\t%p %s\n", ftab[j].entry, runtime·funcname((Func*)(pclntab + ftab[j].funcoff)));
+				runtime·printf("\t%p %s\n", ftab[j].entry, runtime·funcname((Func*)(runtime·pclntab + ftab[j].funcoff)));
 			runtime·throw("invalid runtime symbol table");
 		}
 	}
 	
-	filetab = (uint32*)(pclntab + *(uint32*)&ftab[runtime·nftab].funcoff);
+	filetab = (uint32*)(runtime·pclntab + *(uint32*)&ftab[runtime·nftab].funcoff);
 	runtime·nfiletab = filetab[0];
 
 	runtime·pcquantum = PCQuantum;
 
-	runtime·pclntab.array = (byte*)pclntab;
-	runtime·pclntab.len = (byte*)epclntab - (byte*)pclntab;
-	runtime·pclntab.cap = runtime·pclntab.len;
+	runtime·pclntable.array = (byte*)runtime·pclntab;
+	runtime·pclntable.len = (byte*)runtime·epclntab - (byte*)runtime·pclntab;
+	runtime·pclntable.cap = runtime·pclntable.len;
 
 	runtime·ftabs.array = (byte*)ftab;
 	runtime·ftabs.len = runtime·nftab+1;
@@ -155,7 +155,7 @@ pcvalue(Func *f, int32 off, uintptr targetpc, bool strict)
 	// The table ends at a value delta of 0 except in the first pair.
 	if(off == 0)
 		return -1;
-	p = pclntab + off;
+	p = runtime·pclntab + off;
 	pc = f->entry;
 	value = -1;
 
@@ -194,7 +194,7 @@ runtime·funcname(Func *f)
 {
 	if(f == nil || f->nameoff == 0)
 		return nil;
-	return (int8*)(pclntab + f->nameoff);
+	return (int8*)(runtime·pclntab + f->nameoff);
 }
 
 static int32
@@ -210,7 +210,7 @@ funcline(Func *f, uintptr targetpc, String *file, bool strict)
 		// runtime·printf("looking for %p in %S got file=%d line=%d\n", targetpc, *f->name, fileno, line);
 		return 0;
 	}
-	*file = runtime·gostringnocopy(pclntab + filetab[fileno]);
+	*file = runtime·gostringnocopy(runtime·pclntab + filetab[fileno]);
 	return line;
 }
 
@@ -264,7 +264,7 @@ runtime·findfunc(uintptr addr)
 	while(nf > 0) {
 		n = nf/2;
 		if(f[n].entry <= addr && addr < f[n+1].entry)
-			return (Func*)(pclntab + f[n].funcoff);
+			return (Func*)(runtime·pclntab + f[n].funcoff);
 		else if(addr < f[n].entry)
 			nf = n;
 		else {
diff --git a/src/pkg/runtime/symtab.go b/src/pkg/runtime/symtab.go
index e8f45cfc01..880a78d481 100644
--- a/src/pkg/runtime/symtab.go
+++ b/src/pkg/runtime/symtab.go
@@ -24,7 +24,7 @@ func FuncForPC(pc uintptr) *Func {
 		n := nf / 2
 		f := &ftabs[lo+n]
 		if f.entry <= pc && pc < ftabs[lo+n+1].entry {
-			return (*Func)(unsafe.Pointer(&pclntab[f.funcoff]))
+			return (*Func)(unsafe.Pointer(&pclntable[f.funcoff]))
 		} else if pc < f.entry {
 			nf = n
 		} else {
@@ -39,7 +39,7 @@ func FuncForPC(pc uintptr) *Func {
 
 // Name returns the name of the function.
 func (f *Func) Name() string {
-	return cstringToGo(unsafe.Pointer(&pclntab[f.nameoff]))
+	return cstringToGo(unsafe.Pointer(&pclntable[f.nameoff]))
 }
 
 // Entry returns the entry address of the function.
@@ -60,7 +60,7 @@ func (f *Func) FileLine(pc uintptr) (file string, line int) {
 	if line == -1 {
 		return "?", 0
 	}
-	file = cstringToGo(unsafe.Pointer(&pclntab[filetab[fileno]]))
+	file = cstringToGo(unsafe.Pointer(&pclntable[filetab[fileno]]))
 	return file, line
 }
 
@@ -69,7 +69,7 @@ func (f *Func) pcvalue(off int32, targetpc uintptr) int32 {
 	if off == 0 {
 		return -1
 	}
-	p := pclntab[off:]
+	p := pclntable[off:]
 	pc := f.entry
 	val := int32(-1)
 	for {
@@ -120,7 +120,7 @@ func readvarint(p []byte) (newp []byte, val uint32) {
 
 // Populated by runtime·symtabinit during bootstrapping. Treat as immutable.
 var (
-	pclntab   []byte
+	pclntable []byte
 	ftabs     []ftab
 	filetab   []uint32
 	pcquantum uint32