cmd/7g: reserve registers R26 to R32
These registers are not available for programs to use. Prior to this
change, the compiler would crash attempting to use ZR as a general
purpose register. Other programs would compile but on execution would
overwrite the G register and cause havoc.
Fixes linux/arm64 build.
Fixes #10304
Fixes #10320
Change-Id: I5cf51d3b77cfe3db7dd6377324950cafb02f8d8b
Reviewed-on: https://go-review.googlesource.com/8456
Reviewed-by: Minux Ma <minux@golang.org>
diff --git a/test/fixedbugs/issue10320.go b/test/fixedbugs/issue10320.go
new file mode 100644
index 0000000..697aad1
--- /dev/null
+++ b/test/fixedbugs/issue10320.go
@@ -0,0 +1,55 @@
+// run
+
+// Copyright 2015 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 10320: 7g failed to compile a program because it attempted
+// to use ZR as register. Other programs compiled but failed to
+// execute correctly because they clobbered the g register.
+
+package main
+
+func main() {
+ var x00, x01, x02, x03, x04, x05, x06, x07, x08, x09 int
+ var x10, x11, x12, x13, x14, x15, x16, x17, x18, x19 int
+ var x20, x21, x22, x23, x24, x25, x26, x27, x28, x29 int
+ var x30, x31, x32 int
+
+ _ = x00
+ _ = x01
+ _ = x02
+ _ = x03
+ _ = x04
+ _ = x05
+ _ = x06
+ _ = x07
+ _ = x08
+ _ = x09
+
+ _ = x10
+ _ = x11
+ _ = x12
+ _ = x13
+ _ = x14
+ _ = x15
+ _ = x16
+ _ = x17
+ _ = x18
+ _ = x19
+
+ _ = x20
+ _ = x21
+ _ = x22
+ _ = x23
+ _ = x24
+ _ = x25
+ _ = x26
+ _ = x27
+ _ = x28
+ _ = x29
+
+ _ = x30
+ _ = x31
+ _ = x32
+}
