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Revert "liblink, cmd/ld, runtime: remove stackguard1"

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This reverts commit ab0535ae3f.

I think it will remain useful to distinguish code that must
run on a system stack from code that can run on either stack,
even if that distinction is no
longer based on the implementation language.

That is, I expect to add a //go:systemstack comment that,
in terms of the old implementation, tells the compiler,
to pretend this function was written in C.

Change-Id: I33d2ebb2f99ae12496484c6ec8ed07233d693275
Reviewed-on: https://go-review.googlesource.com/2275
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Russ Cox 2015-01-05 16:29:21 +00:00
parent a1c9e10371
commit e6d3511264
27 changed files with 192 additions and 72 deletions
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12
src/runtime/runtime2.go
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@ -154,10 +154,14 @@ type stack struct {
type g struct {
// Stack parameters.
// stack describes the actual stack memory: [stack.lo, stack.hi).
// stackguard is the stack pointer compared in the Go stack growth prologue.
// stackguard0 is the stack pointer compared in the Go stack growth prologue.
// It is stack.lo+StackGuard normally, but can be StackPreempt to trigger a preemption.
stack stack // offset known to runtime/cgo
stackguard uintptr // offset known to liblink
// stackguard1 is the stack pointer compared in the C stack growth prologue.
// It is stack.lo+StackGuard on g0 and gsignal stacks.
// It is ~0 on other goroutine stacks, to trigger a call to morestackc (and crash).
stack stack // offset known to runtime/cgo
stackguard0 uintptr // offset known to liblink
stackguard1 uintptr // offset known to liblink
_panic *_panic // innermost panic - offset known to liblink
_defer *_defer // innermost defer
@ -171,7 +175,7 @@ type g struct {
waitreason string // if status==gwaiting
schedlink *g
issystem bool // do not output in stack dump, ignore in deadlock detector
preempt bool // preemption signal, duplicates stackguard = stackpreempt
preempt bool // preemption signal, duplicates stackguard0 = stackpreempt
paniconfault bool // panic (instead of crash) on unexpected fault address
preemptscan bool // preempted g does scan for gc
gcworkdone bool // debug: cleared at begining of gc work phase cycle, set by gcphasework, tested at end of cycle