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runtime: use compileCallback for ctrlhandler

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This replaces the externalthreadhandler-based implementation of
ctrlhandler with one based on compileCallback. This is a step toward
eliminating externalthreadhandler.

For #45530.

Change-Id: I2de2f2f37777af292db67ccf8057b7566aab81f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/309632
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Austin Clements 2021-04-13 08:20:08 -04:00
parent 069983e5db
commit e512bc2cf0
6 changed files with 9 additions and 34 deletions
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4
src/cmd/link/internal/ld/pe.go
View File

@ -947,8 +947,8 @@ func (f *peFile) writeOptionalHeader(ctxt *Link) {
// calls that may need more stack than we think.
//
// The default stack reserve size directly affects only the main
// thread, ctrlhandler thread, and profileloop thread. For
// these, it must be greater than the stack size assumed by
// thread and threads that enter in externalthreadhandler.
// For this, it must be greater than the stack size assumed by
// externalthreadhandler.
//
// For other threads, the runtime explicitly asks the kernel

15
src/runtime/os_windows.go
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@ -149,9 +149,6 @@ var (
// to start new os thread.
func tstart_stdcall(newm *m)
// Called by OS using stdcall ABI.
func ctrlhandler()
// Init-time helper
func wintls()
@ -557,8 +554,6 @@ func osinit() {
initExceptionHandler()
stdcall2(_SetConsoleCtrlHandler, funcPC(ctrlhandler), 1)
initHighResTimer()
timeBeginPeriodRetValue = osRelax(false)
@ -685,8 +680,12 @@ func goenvs() {
stdcall1(_FreeEnvironmentStringsW, uintptr(strings))
// We call this all the way here, late in init, so that malloc works
// for the callback function this generates.
// We call these all the way here, late in init, so that malloc works
// for the callback functions these generate.
var fn interface{} = ctrlHandler
ctrlHandlerPC := compileCallback(*efaceOf(&fn), true)
stdcall2(_SetConsoleCtrlHandler, ctrlHandlerPC, 1)
monitorSuspendResume()
}
@ -1176,7 +1175,7 @@ func usleep(us uint32) {
})
}
func ctrlhandler1(_type uint32) uint32 {
func ctrlHandler(_type uint32) uintptr {
var s uint32
switch _type {

9
src/runtime/sys_windows_386.s
View File

@ -156,15 +156,6 @@ TEXT runtime·lastcontinuetramp<ABIInternal>(SB),NOSPLIT,$0-0
MOVL $runtime·lastcontinuehandler(SB), AX
JMP sigtramp<>(SB)
// Called by OS using stdcall ABI: bool ctrlhandler(uint32).
TEXT runtime·ctrlhandler<ABIInternal>(SB),NOSPLIT,$0
PUSHL $runtime·ctrlhandler1(SB)
NOP SP // tell vet SP changed - stop checking offsets
CALL runtime·externalthreadhandler<ABIInternal>(SB)
MOVL 4(SP), CX
ADDL $12, SP
JMP CX
// Called by OS using stdcall ABI: uint32 profileloop(void*).
TEXT runtime·profileloop<ABIInternal>(SB),NOSPLIT,$0
PUSHL $runtime·profileloop1(SB)

7
src/runtime/sys_windows_amd64.s
View File

@ -202,13 +202,6 @@ TEXT runtime·lastcontinuetramp<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-0
MOVQ $runtime·lastcontinuehandler(SB), AX
JMP sigtramp<>(SB)
TEXT runtime·ctrlhandler<ABIInternal>(SB),NOSPLIT|NOFRAME,$8
MOVQ CX, 16(SP) // spill
MOVQ $runtime·ctrlhandler1(SB), CX
MOVQ CX, 0(SP)
CALL runtime·externalthreadhandler<ABIInternal>(SB)
RET
TEXT runtime·profileloop<ABIInternal>(SB),NOSPLIT|NOFRAME,$8
MOVQ $runtime·profileloop1(SB), CX
MOVQ CX, 0(SP)

4
src/runtime/sys_windows_arm.s
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@ -233,10 +233,6 @@ TEXT runtime·lastcontinuetramp<ABIInternal>(SB),NOSPLIT|NOFRAME,$0
MOVW $runtime·lastcontinuehandler(SB), R1
B sigtramp<>(SB)
TEXT runtime·ctrlhandler<ABIInternal>(SB),NOSPLIT|NOFRAME,$0
MOVW $runtime·ctrlhandler1(SB), R1
B runtime·externalthreadhandler<ABIInternal>(SB)
TEXT runtime·profileloop<ABIInternal>(SB),NOSPLIT|NOFRAME,$0
MOVW $runtime·profileloop1(SB), R1
B runtime·externalthreadhandler<ABIInternal>(SB)

4
src/runtime/sys_windows_arm64.s
View File

@ -299,10 +299,6 @@ TEXT runtime·lastcontinuetramp(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·lastcontinuehandler<ABIInternal>(SB), R1
B sigtramp<>(SB)
TEXT runtime·ctrlhandler<ABIInternal>(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·ctrlhandler1(SB), R1
B runtime·externalthreadhandler<ABIInternal>(SB)
TEXT runtime·profileloop<ABIInternal>(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·profileloop1(SB), R1
B runtime·externalthreadhandler<ABIInternal>(SB)