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runtime: use libc's signal functions on Darwin
sigaction, sigprocmask, sigaltstack, and raiseproc. Fix bug in mstart_stub where we weren't saving callee-saved registers, so if an m finished the pthread library calling mstart_stub would sometimes fail. Update #17490 Update #22805 Change-Id: Ie297ede0997910aa956834e49e85711b90cdfaa7 Reviewed-on: https://go-review.googlesource.com/116875 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Keith Randall
parent
adeb7e640b
commit
ec989337c5
@ -158,6 +158,7 @@ type Sighandler C.union___sigaction_u
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type Sigaction C.struct___sigaction // used in syscalls
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type Usigaction C.struct_sigaction // used by sigaction second argument
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type Sigset C.sigset_t
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type Sigval C.union_sigval
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type Siginfo C.siginfo_t
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type Timeval C.struct_timeval
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@ -206,7 +206,6 @@ func mpreinit(mp *m) {
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func minit() {
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// The alternate signal stack is buggy on arm and arm64.
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// The signal handler handles it directly.
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// The sigaltstack assembly function does nothing.
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if GOARCH != "arm" && GOARCH != "arm64" {
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minitSignalStack()
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}
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@ -499,24 +498,9 @@ const (
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_SS_DISABLE = 4
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)
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//go:noescape
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func sigprocmask(how int32, new, old *sigset)
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//go:noescape
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func sigaction(mode uint32, new *sigactiont, old *usigactiont)
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//go:noescape
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func sigaltstack(new, old *stackt)
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// darwin/arm64 uses registers instead of stack-based arguments.
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// TODO: does this matter?
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func sigtramp(fn uintptr, infostyle, sig uint32, info *siginfo, ctx unsafe.Pointer)
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//go:noescape
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func setitimer(mode int32, new, old *itimerval)
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func raiseproc(sig uint32)
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//extern SigTabTT runtime·sigtab[];
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type sigset uint32
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@ -526,14 +510,20 @@ var sigset_all = ^sigset(0)
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//go:nosplit
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//go:nowritebarrierrec
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func setsig(i uint32, fn uintptr) {
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var sa sigactiont
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var sa usigactiont
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sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
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sa.sa_mask = ^uint32(0)
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sa.sa_tramp = unsafe.Pointer(funcPC(sigtramp)) // runtime·sigtramp's job is to call into real handler
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if fn == funcPC(sighandler) {
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fn = funcPC(sigtramp)
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}
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*(*uintptr)(unsafe.Pointer(&sa.__sigaction_u)) = fn
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sigaction(i, &sa, nil)
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}
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// sigtramp is the callback from libc when a signal is received.
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// It is called with the C calling convention.
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func sigtramp()
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//go:nosplit
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//go:nowritebarrierrec
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func setsigstack(i uint32) {
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@ -543,9 +533,8 @@ func setsigstack(i uint32) {
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if osa.sa_flags&_SA_ONSTACK != 0 {
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return
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}
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var sa sigactiont
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var sa usigactiont
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*(*uintptr)(unsafe.Pointer(&sa.__sigaction_u)) = handler
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sa.sa_tramp = unsafe.Pointer(funcPC(sigtramp))
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sa.sa_mask = osa.sa_mask
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sa.sa_flags = osa.sa_flags | _SA_ONSTACK
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sigaction(i, &sa, nil)
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@ -179,6 +179,41 @@ func walltime() (int64, int32) {
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}
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func walltime_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigaction(sig uint32, new *usigactiont, old *usigactiont) {
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asmcgocall(unsafe.Pointer(funcPC(sigaction_trampoline)), unsafe.Pointer(&sig))
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}
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func sigaction_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigprocmask(how uint32, new *sigset, old *sigset) {
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asmcgocall(unsafe.Pointer(funcPC(sigprocmask_trampoline)), unsafe.Pointer(&how))
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}
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func sigprocmask_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigaltstack(new *stackt, old *stackt) {
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if new != nil && new.ss_flags&_SS_DISABLE != 0 && new.ss_size == 0 {
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// Despite the fact that Darwin's sigaltstack man page says it ignores the size
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// when SS_DISABLE is set, it doesn't. sigaltstack returns ENOMEM
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// if we don't give it a reasonable size.
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// ref: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20140421/214296.html
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new.ss_size = 32768
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}
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asmcgocall(unsafe.Pointer(funcPC(sigaltstack_trampoline)), unsafe.Pointer(&new))
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}
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func sigaltstack_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func raiseproc(sig uint32) {
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asmcgocall(unsafe.Pointer(funcPC(raiseproc_trampoline)), unsafe.Pointer(&sig))
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}
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func raiseproc_trampoline()
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// Not used on Darwin, but must be defined.
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func exitThread(wait *uint32) {
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}
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@ -207,6 +242,11 @@ func exitThread(wait *uint32) {
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//go:cgo_import_dynamic libc_mach_timebase_info mach_timebase_info "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_mach_absolute_time mach_absolute_time "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_gettimeofday gettimeofday "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_sigaction sigaction "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_sigmask pthread_sigmask "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_sigaltstack sigaltstack "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_getpid getpid "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_kill kill "/usr/lib/libSystem.B.dylib"
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// Magic incantation to get libSystem actually dynamically linked.
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// TODO: Why does the code require this? See cmd/compile/internal/ld/go.go:210
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@ -84,17 +84,6 @@ TEXT runtime·write_trampoline(SB),NOSPLIT,$0
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POPL BP
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$16
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MOVL $20, AX // getpid
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INT $0x80
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MOVL AX, 4(SP) // pid
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MOVL sig+0(FP), AX
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MOVL AX, 8(SP) // signal
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MOVL $1, 12(SP) // posix
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MOVL $37, AX // kill
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INT $0x80
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RET
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TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
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PUSHL BP
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MOVL SP, BP
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@ -211,18 +200,73 @@ initialized:
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POPL BP
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RET
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TEXT runtime·sigprocmask(SB),NOSPLIT,$0
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MOVL $329, AX // pthread_sigmask (on OS X, sigprocmask==entire process)
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INT $0x80
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JAE 2(PC)
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TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
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PUSHL BP
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MOVL SP, BP
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SUBL $24, SP
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MOVL 32(SP), CX
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MOVL 0(CX), AX // arg 1 sig
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MOVL AX, 0(SP)
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MOVL 4(CX), AX // arg 2 new
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MOVL AX, 4(SP)
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MOVL 8(CX), AX // arg 3 old
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MOVL AX, 8(SP)
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CALL libc_sigaction(SB)
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TESTL AX, AX
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JEQ 2(PC)
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MOVL $0xf1, 0xf1 // crash
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MOVL BP, SP
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POPL BP
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RET
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TEXT runtime·sigaction(SB),NOSPLIT,$0
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MOVL $46, AX
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INT $0x80
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JAE 2(PC)
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TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
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PUSHL BP
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MOVL SP, BP
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SUBL $24, SP
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MOVL 32(SP), CX
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MOVL 0(CX), AX // arg 1 how
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MOVL AX, 0(SP)
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MOVL 4(CX), AX // arg 2 new
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MOVL AX, 4(SP)
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MOVL 8(CX), AX // arg 3 old
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MOVL AX, 8(SP)
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CALL libc_pthread_sigmask(SB)
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TESTL AX, AX
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JEQ 2(PC)
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MOVL $0xf1, 0xf1 // crash
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MOVL BP, SP
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POPL BP
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RET
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TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
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PUSHL BP
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MOVL SP, BP
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SUBL $8, SP
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MOVL 16(SP), CX
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MOVL 0(CX), AX // arg 1 new
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MOVL AX, 0(SP)
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MOVL 4(CX), AX // arg 2 old
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MOVL AX, 4(SP)
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CALL libc_sigaltstack(SB)
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TESTL AX, AX
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JEQ 2(PC)
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MOVL $0xf1, 0xf1 // crash
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MOVL BP, SP
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POPL BP
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RET
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TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
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PUSHL BP
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MOVL SP, BP
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SUBL $8, SP
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CALL libc_getpid(SB)
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MOVL AX, 0(SP) // arg 1 pid
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MOVL 16(SP), CX
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MOVL 0(CX), AX
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MOVL AX, 4(SP) // arg 2 signal
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CALL libc_kill(SB)
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MOVL BP, SP
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POPL BP
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
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@ -243,38 +287,32 @@ TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
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RET
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// Sigtramp's job is to call the actual signal handler.
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// It is called with the following arguments on the stack:
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// 0(SP) "return address" - ignored
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// 4(SP) actual handler
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// 8(SP) siginfo style
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// 12(SP) signal number
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// 16(SP) siginfo
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// 20(SP) context
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TEXT runtime·sigtramp(SB),NOSPLIT,$20
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MOVL sig+8(FP), BX
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MOVL BX, 0(SP)
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MOVL info+12(FP), BX
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MOVL BX, 4(SP)
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MOVL ctx+16(FP), BX
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MOVL BX, 8(SP)
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// It is called with the C calling convention, and calls out
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// to sigtrampgo with the Go calling convention.
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TEXT runtime·sigtramp(SB),NOSPLIT,$0
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SUBL $28, SP
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// Save callee-save registers.
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MOVL BP, 12(SP)
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MOVL BX, 16(SP)
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MOVL SI, 20(SP)
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MOVL DI, 24(SP)
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MOVL 32(SP), AX
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MOVL AX, 0(SP) // arg 1 signal number
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MOVL 36(SP), AX
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MOVL AX, 4(SP) // arg 2 siginfo
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MOVL 40(SP), AX
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MOVL AX, 8(SP) // arg 3 ctxt
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CALL runtime·sigtrampgo(SB)
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// call sigreturn
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MOVL ctx+16(FP), CX
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MOVL infostyle+4(FP), BX
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MOVL $0, 0(SP) // "caller PC" - ignored
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MOVL CX, 4(SP)
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MOVL BX, 8(SP)
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MOVL $184, AX // sigreturn(ucontext, infostyle)
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INT $0x80
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MOVL $0xf1, 0xf1 // crash
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RET
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// Restore callee-save registers.
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MOVL 12(SP), BP
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MOVL 16(SP), BX
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MOVL 20(SP), SI
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MOVL 24(SP), DI
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TEXT runtime·sigaltstack(SB),NOSPLIT,$0
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MOVL $53, AX
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INT $0x80
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JAE 2(PC)
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MOVL $0xf1, 0xf1 // crash
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ADDL $28, SP
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RET
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TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
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@ -409,8 +447,15 @@ TEXT runtime·mstart_stub(SB),NOSPLIT,$0
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// The value at SP+4 points to the m.
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// We are already on m's g0 stack.
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// Save callee-save registers.
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SUBL $16, SP
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MOVL BP, 0(SP)
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MOVL BX, 4(SP)
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MOVL SI, 8(SP)
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MOVL DI, 12(SP)
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MOVL SP, AX // hide argument read from vet (vet thinks this function is using the Go calling convention)
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MOVL 4(AX), DI // m
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MOVL 20(AX), DI // m
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MOVL m_g0(DI), DX // g
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// Initialize TLS entry.
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@ -422,10 +467,18 @@ TEXT runtime·mstart_stub(SB),NOSPLIT,$0
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CALL runtime·mstart(SB)
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// Restore callee-save registers.
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MOVL 0(SP), BP
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MOVL 4(SP), BX
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MOVL 8(SP), SI
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MOVL 12(SP), DI
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// Go is all done with this OS thread.
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// Tell pthread everything is ok (we never join with this thread, so
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// the value here doesn't really matter).
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XORL AX, AX
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ADDL $16, SP
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RET
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TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0
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@ -63,16 +63,6 @@ TEXT runtime·write_trampoline(SB),NOSPLIT,$0
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POPQ BP
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$24
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MOVL $(0x2000000+20), AX // getpid
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SYSCALL
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MOVQ AX, DI // arg 1 - pid
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MOVL sig+0(FP), SI // arg 2 - signal
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MOVL $1, DX // arg 3 - posix
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MOVL $(0x2000000+37), AX // kill
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SYSCALL
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RET
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TEXT runtime·setitimer(SB), NOSPLIT, $0
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MOVL mode+0(FP), DI
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MOVQ new+8(FP), SI
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@ -132,26 +122,53 @@ TEXT runtime·walltime_trampoline(SB),NOSPLIT,$0
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POPQ BP
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RET
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TEXT runtime·sigprocmask(SB),NOSPLIT,$0
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MOVL how+0(FP), DI
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MOVQ new+8(FP), SI
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MOVQ old+16(FP), DX
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MOVL $(0x2000000+329), AX // pthread_sigmask (on OS X, sigprocmask==entire process)
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SYSCALL
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JCC 2(PC)
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TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
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PUSHQ BP
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MOVQ SP, BP
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MOVQ 8(DI), SI // arg 2 new
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MOVQ 16(DI), DX // arg 3 old
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MOVL 0(DI), DI // arg 1 sig
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CALL libc_sigaction(SB)
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TESTL AX, AX
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JEQ 2(PC)
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MOVL $0xf1, 0xf1 // crash
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POPQ BP
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RET
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TEXT runtime·sigaction(SB),NOSPLIT,$0-24
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MOVL mode+0(FP), DI // arg 1 sig
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MOVQ new+8(FP), SI // arg 2 act
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MOVQ old+16(FP), DX // arg 3 oact
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MOVQ old+16(FP), CX // arg 3 oact
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MOVQ old+16(FP), R10 // arg 3 oact
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MOVL $(0x2000000+46), AX // syscall entry
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SYSCALL
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JCC 2(PC)
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TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
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PUSHQ BP
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MOVQ SP, BP
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MOVQ 8(DI), SI // arg 2 new
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MOVQ 16(DI), DX // arg 3 old
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MOVL 0(DI), DI // arg 1 how
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CALL libc_pthread_sigmask(SB)
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TESTL AX, AX
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JEQ 2(PC)
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MOVL $0xf1, 0xf1 // crash
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POPQ BP
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RET
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TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
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PUSHQ BP
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MOVQ SP, BP
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MOVQ 8(DI), SI // arg 2 old
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MOVQ 0(DI), DI // arg 1 new
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CALL libc_sigaltstack(SB)
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TESTQ AX, AX
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JEQ 2(PC)
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MOVL $0xf1, 0xf1 // crash
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POPQ BP
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RET
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TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
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PUSHQ BP
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MOVQ SP, BP
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MOVL 0(DI), BX // signal
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CALL libc_getpid(SB)
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MOVL AX, DI // arg 1 pid
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MOVL BX, SI // arg 2 signal
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CALL libc_kill(SB)
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POPQ BP
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
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@ -167,21 +184,39 @@ TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
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POPQ BP
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$40
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MOVL SI, 24(SP) // save infostyle for sigreturn below
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MOVQ R8, 32(SP) // save ctx
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MOVL DX, 0(SP) // sig
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MOVQ CX, 8(SP) // info
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MOVQ R8, 16(SP) // ctx
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MOVQ $runtime·sigtrampgo(SB), AX
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CALL AX
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MOVQ 32(SP), DI // ctx
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MOVL 24(SP), SI // infostyle
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MOVL $(0x2000000+184), AX
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SYSCALL
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INT $3 // not reached
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// This is the function registered during sigaction and is invoked when
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// a signal is received. It just redirects to the Go function sigtrampgo.
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TEXT runtime·sigtramp(SB),NOSPLIT,$0
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// This runs on the signal stack, so we have lots of stack available.
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// We allocate our own stack space, because if we tell the linker
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// how much we're using, the NOSPLIT check fails.
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PUSHQ BP
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MOVQ SP, BP
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SUBQ $64, SP
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// Save callee-save registers.
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MOVQ BX, 24(SP)
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MOVQ R12, 32(SP)
|
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MOVQ R13, 40(SP)
|
||||
MOVQ R14, 48(SP)
|
||||
MOVQ R15, 56(SP)
|
||||
|
||||
// Call into the Go signal handler
|
||||
MOVL DI, 0(SP) // sig
|
||||
MOVQ SI, 8(SP) // info
|
||||
MOVQ DX, 16(SP) // ctx
|
||||
CALL runtime·sigtrampgo(SB)
|
||||
|
||||
// Restore callee-save registers.
|
||||
MOVQ 24(SP), BX
|
||||
MOVQ 32(SP), R12
|
||||
MOVQ 40(SP), R13
|
||||
MOVQ 48(SP), R14
|
||||
MOVQ 56(SP), R15
|
||||
|
||||
MOVQ BP, SP
|
||||
POPQ BP
|
||||
RET
|
||||
|
||||
TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
|
||||
PUSHQ BP // make a frame; keep stack aligned
|
||||
@ -218,15 +253,6 @@ TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0
|
||||
POPQ BP
|
||||
RET
|
||||
|
||||
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
|
||||
MOVQ new+0(FP), DI
|
||||
MOVQ old+8(FP), SI
|
||||
MOVQ $(0x2000000+53), AX
|
||||
SYSCALL
|
||||
JCC 2(PC)
|
||||
MOVL $0xf1, 0xf1 // crash
|
||||
RET
|
||||
|
||||
TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
|
||||
PUSHQ BP
|
||||
MOVQ SP, BP
|
||||
@ -372,6 +398,14 @@ TEXT runtime·mstart_stub(SB),NOSPLIT,$0
|
||||
// DI points to the m.
|
||||
// We are already on m's g0 stack.
|
||||
|
||||
// Save callee-save registers.
|
||||
SUBQ $40, SP
|
||||
MOVQ BX, 0(SP)
|
||||
MOVQ R12, 8(SP)
|
||||
MOVQ R13, 16(SP)
|
||||
MOVQ R14, 24(SP)
|
||||
MOVQ R15, 32(SP)
|
||||
|
||||
MOVQ m_g0(DI), DX // g
|
||||
|
||||
// Initialize TLS entry.
|
||||
@ -383,10 +417,19 @@ TEXT runtime·mstart_stub(SB),NOSPLIT,$0
|
||||
|
||||
CALL runtime·mstart(SB)
|
||||
|
||||
// Restore callee-save registers.
|
||||
MOVQ 0(SP), BX
|
||||
MOVQ 8(SP), R12
|
||||
MOVQ 16(SP), R13
|
||||
MOVQ 24(SP), R14
|
||||
MOVQ 32(SP), R15
|
||||
|
||||
// Go is all done with this OS thread.
|
||||
// Tell pthread everything is ok (we never join with this thread, so
|
||||
// the value here doesn't really matter).
|
||||
XORL AX, AX
|
||||
|
||||
ADDQ $40, SP
|
||||
RET
|
||||
|
||||
// These trampolines help convert from Go calling convention to C calling convention.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user