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runtime: add a constant for the smallest possible stack frame

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Shared libraries on ppc64le will require a larger minimum stack frame (because
the ABI mandates that the TOC pointer is available at 24(R1)). So to prepare
for this, make a constant for the fixed part of a stack and use that where
necessary.

Change-Id: I447949f4d725003bb82e7d2cf7991c1bca5aa887
Reviewed-on: https://go-review.googlesource.com/15523
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2015-10-08 21:52:03 +13:00
parent 45c06b27a4
commit a4855812e2
14 changed files with 38 additions and 37 deletions
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4
src/runtime/stack.go
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@ -578,12 +578,10 @@ func adjustframe(frame *stkframe, arg unsafe.Pointer) bool {
size := frame.varp - frame.sp
var minsize uintptr
switch thechar {
case '6', '8':
minsize = 0
case '7':
minsize = spAlign
default:
minsize = ptrSize
minsize = minFrameSize
}
if size > minsize {
var bv bitvector