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Commit ab552aa3 authored by Ian Lance Taylor's avatar Ian Lance Taylor
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runtime: unify some signal handling functions 

Unify the OS-specific versions of msigsave, msigrestore, sigblock,
updatesigmask, and unblocksig into single versions in signal_unix.go.
To do this, make sigprocmask work the same way on all systems, which
required adding a definition of sigprocmask for linux and openbsd.
Also add a single OS-specific function sigmaskToSigset.

Change-Id: I7cbf75131dddb57eeefe648ef845b0791404f785
Reviewed-on: https://go-review.googlesource.com/29689
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarDavid Crawshaw <crawshaw@golang.org>
parent fd296282
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Inline Side-by-side
Showing with 134 additions and 209 deletions
src/runtime/os3_solaris.go
View file @ ab552aa3
......@@ -204,21 +204,6 @@ func mpreinit(mp *m) {
func miniterrno()
//go:nosplit
func msigsave(mp *m) {
sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
}
//go:nosplit
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, &sigmask, nil)
}
//go:nosplit
func sigblock() {
sigprocmask(_SIG_SETMASK, &sigset_all, nil)
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
......@@ -348,16 +333,10 @@ func signalstack(s *stack) {
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
var mask sigset
copy(mask.__sigbits[:], m[:])
sigprocmask(_SIG_SETMASK, &mask, nil)
}
func unblocksig(sig int32) {
var mask sigset
mask.__sigbits[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
sigprocmask(_SIG_UNBLOCK, &mask, nil)
func sigmaskToSigset(m sigmask) sigset {
var set sigset
copy(set.__sigbits[:], m[:])
return set
}
//go:nosplit
......
src/runtime/os_darwin.go
View file @ ab552aa3
......@@ -173,21 +173,6 @@ func mpreinit(mp *m) {
mp.gsignal.m = mp
}
//go:nosplit
func msigsave(mp *m) {
sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
}
//go:nosplit
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, &sigmask, nil)
}
//go:nosplit
func sigblock() {
sigprocmask(_SIG_SETMASK, &sigset_all, nil)
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
......@@ -515,7 +500,7 @@ const (
)
//go:noescape
func sigprocmask(how uint32, new, old *sigset)
func sigprocmask(how int32, new, old *sigset)
//go:noescape
func sigaction(mode uint32, new *sigactiont, old *usigactiont)
......@@ -593,12 +578,6 @@ func signalstack(s *stack) {
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
s := sigset(m[0])
sigprocmask(_SIG_SETMASK, &s, nil)
}
func unblocksig(sig int32) {
mask := sigset(1) << (uint32(sig) - 1)
sigprocmask(_SIG_UNBLOCK, &mask, nil)
func sigmaskToSigset(m sigmask) sigset {
return sigset(m[0])
}
src/runtime/os_dragonfly.go
View file @ ab552aa3
......@@ -177,21 +177,6 @@ func mpreinit(mp *m) {
mp.gsignal.m = mp
}
//go:nosplit
func msigsave(mp *m) {
sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
}
//go:nosplit
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, &sigmask, nil)
}
//go:nosplit
func sigblock() {
sigprocmask(_SIG_SETMASK, &sigset_all, nil)
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
......@@ -322,14 +307,8 @@ func signalstack(s *stack) {
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
var mask sigset
copy(mask.__bits[:], m[:])
sigprocmask(_SIG_SETMASK, &mask, nil)
}
func unblocksig(sig int32) {
var mask sigset
mask.__bits[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
sigprocmask(_SIG_UNBLOCK, &mask, nil)
func sigmaskToSigset(m sigmask) sigset {
var set sigset
copy(set.__bits[:], m[:])
return set
}
src/runtime/os_freebsd.go
View file @ ab552aa3
......@@ -164,21 +164,6 @@ func mpreinit(mp *m) {
mp.gsignal.m = mp
}
//go:nosplit
func msigsave(mp *m) {
sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
}
//go:nosplit
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, &sigmask, nil)
}
//go:nosplit
func sigblock() {
sigprocmask(_SIG_SETMASK, &sigset_all, nil)
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
......@@ -312,14 +297,8 @@ func signalstack(s *stack) {
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m [(_NSIG + 31) / 32]uint32) {
var mask sigset
copy(mask.__bits[:], m[:])
sigprocmask(_SIG_SETMASK, &mask, nil)
}
func unblocksig(sig int32) {
var mask sigset
mask.__bits[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
sigprocmask(_SIG_UNBLOCK, &mask, nil)
func sigmaskToSigset(m sigmask) sigset {
var set sigset
copy(set.__bits[:], m[:])
return set
}
src/runtime/os_linux.go
View file @ ab552aa3
......@@ -148,9 +148,9 @@ func newosproc(mp *m, stk unsafe.Pointer) {
// Disable signals during clone, so that the new thread starts
// with signals disabled. It will enable them in minit.
var oset sigset
rtsigprocmask(_SIG_SETMASK, &sigset_all, &oset, int32(unsafe.Sizeof(oset)))
sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
ret := clone(cloneFlags, stk, unsafe.Pointer(mp), unsafe.Pointer(mp.g0), unsafe.Pointer(funcPC(mstart)))
rtsigprocmask(_SIG_SETMASK, &oset, nil, int32(unsafe.Sizeof(oset)))
sigprocmask(_SIG_SETMASK, &oset, nil)
if ret < 0 {
print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", -ret, ")\n")
......@@ -252,22 +252,6 @@ func mpreinit(mp *m) {
mp.gsignal.m = mp
}
//go:nosplit
func msigsave(mp *m) {
smask := &mp.sigmask
rtsigprocmask(_SIG_SETMASK, nil, smask, int32(unsafe.Sizeof(*smask)))
}
//go:nosplit
func msigrestore(sigmask sigset) {
rtsigprocmask(_SIG_SETMASK, &sigmask, nil, int32(unsafe.Sizeof(sigmask)))
}
//go:nosplit
func sigblock() {
rtsigprocmask(_SIG_SETMASK, &sigset_all, nil, int32(unsafe.Sizeof(sigset_all)))
}
func gettid() uint32
// Called to initialize a new m (including the bootstrap m).
......@@ -302,7 +286,7 @@ func minit() {
sigdelset(&nmask, i)
}
}
rtsigprocmask(_SIG_SETMASK, &nmask, nil, int32(unsafe.Sizeof(nmask)))
sigprocmask(_SIG_SETMASK, &nmask, nil)
}
// Called from dropm to undo the effect of an minit.
......@@ -363,7 +347,13 @@ func sigaltstack(new, old *sigaltstackt)
func setitimer(mode int32, new, old *itimerval)
//go:noescape
func rtsigprocmask(sig uint32, new, old *sigset, size int32)
func rtsigprocmask(how int32, new, old *sigset, size int32)
//go:nosplit
//go:nowritebarrierrec
func sigprocmask(how int32, new, old *sigset) {
rtsigprocmask(how, new, old, int32(unsafe.Sizeof(*new)))
}
//go:noescape
func getrlimit(kind int32, limit unsafe.Pointer) int32
......@@ -441,17 +431,3 @@ func signalstack(s *stack) {
}
sigaltstack(&st, nil)
}
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
var mask sigset
sigcopyset(&mask, m)
rtsigprocmask(_SIG_SETMASK, &mask, nil, int32(unsafe.Sizeof(mask)))
}
func unblocksig(sig int32) {
var mask sigset
sigaddset(&mask, int(sig))
rtsigprocmask(_SIG_UNBLOCK, &mask, nil, int32(unsafe.Sizeof(mask)))
}
src/runtime/os_linux_generic.go
View file @ ab552aa3
......@@ -43,6 +43,10 @@ func sigfillset(mask *uint64) {
*mask = ^uint64(0)
}
func sigcopyset(mask *sigset, m sigmask) {
copy((*mask)[:], m[:])
//go:nosplit
//go:nowritebarrierrec
func sigmaskToSigset(m sigmask) sigset {
var set sigset
copy(set[:], m[:])
return set
}
src/runtime/os_linux_mips64x.go
View file @ ab552aa3
......@@ -59,6 +59,10 @@ func sigfillset(mask *[2]uint64) {
(*mask)[0], (*mask)[1] = ^uint64(0), ^uint64(0)
}
func sigcopyset(mask *sigset, m sigmask) {
(*mask)[0] = uint64(m[0]) | uint64(m[1])<<32
//go:nosplit
//go:nowritebarrierrec
func sigmaskToSigset(m sigmask) sigset {
var set sigset
set[0] = uint64(m[0]) | uint64(m[1])<<32
return set
}
src/runtime/os_linux_s390x.go
View file @ ab552aa3
......@@ -41,6 +41,8 @@ func sigfillset(mask *uint64) {
*mask = ^uint64(0)
}
func sigcopyset(mask *sigset, m sigmask) {
*mask = sigset(uint64(m[0]) | uint64(m[1])<<32)
//go:nosplit
//go:nowritebarrierrec
func sigmaskToSigset(m sigmask) sigset {
return sigset(uint64(m[0]) | uint64(m[1])<<32)
}
src/runtime/os_netbsd.go
View file @ ab552aa3
......@@ -38,7 +38,7 @@ func sigaction(sig int32, new, old *sigactiont)
func sigaltstack(new, old *sigaltstackt)
//go:noescape
func sigprocmask(mode int32, new, old *sigset)
func sigprocmask(how int32, new, old *sigset)
//go:noescape
func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
......@@ -222,21 +222,6 @@ func mpreinit(mp *m) {
mp.gsignal.m = mp
}
//go:nosplit
func msigsave(mp *m) {
sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
}
//go:nosplit
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, &sigmask, nil)
}
//go:nosplit
func sigblock() {
sigprocmask(_SIG_SETMASK, &sigset_all, nil)
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
......@@ -333,14 +318,8 @@ func signalstack(s *stack) {
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
var mask sigset
copy(mask.__bits[:], m[:])
sigprocmask(_SIG_SETMASK, &mask, nil)
}
func unblocksig(sig int32) {
var mask sigset
mask.__bits[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
sigprocmask(_SIG_UNBLOCK, &mask, nil)
func sigmaskToSigset(m sigmask) sigset {
var set sigset
copy(set.__bits[:], m[:])
return set
}
src/runtime/os_openbsd.go
View file @ ab552aa3
......@@ -23,7 +23,20 @@ func sigaction(sig int32, new, old *sigactiont)
func sigaltstack(new, old *stackt)
//go:noescape
func sigprocmask(mode int32, new sigset) sigset
func obsdsigprocmask(how int32, new sigset) sigset
//go:nosplit
//go:nowritebarrierrec
func sigprocmask(how int32, new, old *sigset) {
n := sigset(0)
if new != nil {
n = *new
}
r := obsdsigprocmask(how, n)
if old != nil {
*old = r
}
}
//go:noescape
func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
......@@ -57,10 +70,7 @@ const (
type sigset uint32
const (
sigset_none = sigset(0)
sigset_all = ^sigset(0)
)
var sigset_all = ^sigset(0)
// From OpenBSD's <sys/sysctl.h>
const (
......@@ -160,9 +170,10 @@ func newosproc(mp *m, stk unsafe.Pointer) {
tf_stack: uintptr(stk),
}
oset := sigprocmask(_SIG_SETMASK, sigset_all)
var oset sigset
sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
ret := tfork(&param, unsafe.Sizeof(param), mp, mp.g0, funcPC(mstart))
sigprocmask(_SIG_SETMASK, oset)
sigprocmask(_SIG_SETMASK, &oset, nil)
if ret < 0 {
print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n")
......@@ -199,21 +210,6 @@ func mpreinit(mp *m) {
mp.gsignal.m = mp
}
//go:nosplit
func msigsave(mp *m) {
mp.sigmask = sigprocmask(_SIG_BLOCK, 0)
}
//go:nosplit
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, sigmask)
}
//go:nosplit
func sigblock() {
sigprocmask(_SIG_SETMASK, sigset_all)
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, can not allocate memory.
func minit() {
......@@ -246,7 +242,7 @@ func minit() {
nmask &^= 1 << (uint32(i) - 1)
}
}
sigprocmask(_SIG_SETMASK, nmask)
sigprocmask(_SIG_SETMASK, &nmask, nil)
}
// Called from dropm to undo the effect of an minit.
......@@ -317,11 +313,6 @@ func signalstack(s *stack) {
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
sigprocmask(_SIG_SETMASK, sigset(m[0]))
}
func unblocksig(sig int32) {
mask := sigset(1) << (uint32(sig) - 1)
sigprocmask(_SIG_UNBLOCK, mask)
func sigmaskToSigset(m sigmask) sigset {
return sigset(m[0])
}
src/runtime/signal_unix.go
View file @ ab552aa3
......@@ -420,3 +420,56 @@ func sigfwdgo(sig uint32, info *siginfo, ctx unsafe.Pointer) bool {
}
return true
}
// msigsave saves the current thread's signal mask into mp.sigmask.
// This is used to preserve the non-Go signal mask when a non-Go
// thread calls a Go function.
// This is nosplit and nowritebarrierrec because it is called by needm
// which may be called on a non-Go thread with no g available.
//go:nosplit
//go:nowritebarrierrec
func msigsave(mp *m) {
sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
}
// msigrestore sets the current thread's signal mask to sigmask.
// This is used to restore the non-Go signal mask when a non-Go thread
// calls a Go function.
// This is nosplit and nowritebarrierrec because it is called by dropm
// after g has been cleared.
//go:nosplit
//go:nowritebarrierrec
func msigrestore(sigmask sigset) {
sigprocmask(_SIG_SETMASK, &sigmask, nil)
}
// sigblock blocks all signals in the current thread's signal mask.
// This is used to block signals while setting up and tearing down g
// when a non-Go thread calls a Go function.
// The OS-specific code is expected to define sigset_all.
// This is nosplit and nowritebarrierrec because it is called by needm
// which may be called on a non-Go thread with no g available.
//go:nosplit
//go:nowritebarrierrec
func sigblock() {
sigprocmask(_SIG_SETMASK, &sigset_all, nil)
}
// updatesigmask sets the current thread's signal mask to m.
// This is nosplit and nowritebarrierrec because it is called from
// dieFromSignal, which can be called by sigfwdgo while running in the
// signal handler, on the signal stack, with no g available.
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
set := sigmaskToSigset(m)
sigprocmask(_SIG_SETMASK, &set, nil)
}
// unblocksig removes sig from the current thread's signal mask.
func unblocksig(sig int32) {
var m sigmask
m[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
set := sigmaskToSigset(m)
sigprocmask(_SIG_UNBLOCK, &set, nil)
}
src/runtime/sys_linux_386.s
View file @ ab552aa3
......@@ -191,7 +191,7 @@ TEXT runtime·nanotime(SB), NOSPLIT, $32
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0
MOVL $175, AX // syscall entry
MOVL sig+0(FP), BX
MOVL how+0(FP), BX
MOVL new+4(FP), CX
MOVL old+8(FP), DX
MOVL size+12(FP), SI
......
src/runtime/sys_linux_amd64.s
View file @ ab552aa3
......@@ -197,7 +197,7 @@ fallback:
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-28
MOVL sig+0(FP), DI
MOVL how+0(FP), DI
MOVQ new+8(FP), SI
MOVQ old+16(FP), DX
MOVL size+24(FP), R10
......
src/runtime/sys_linux_arm.s
View file @ ab552aa3
......@@ -365,7 +365,7 @@ TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
B (R11)
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0
MOVW sig+0(FP), R0
MOVW how+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW size+12(FP), R3
......
src/runtime/sys_linux_arm64.s
View file @ ab552aa3
......@@ -212,7 +212,7 @@ TEXT runtime·nanotime(SB),NOSPLIT,$24-8
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-28
MOVW sig+0(FP), R0
MOVW how+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVW size+24(FP), R3
......
src/runtime/sys_linux_mips64x.s
View file @ ab552aa3
......@@ -204,7 +204,7 @@ TEXT runtime·nanotime(SB),NOSPLIT,$16
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-28
MOVW sig+0(FP), R4
MOVW how+0(FP), R4
MOVV new+8(FP), R5
MOVV old+16(FP), R6
MOVW size+24(FP), R7
......
src/runtime/sys_linux_ppc64x.s
View file @ ab552aa3
......@@ -183,7 +183,7 @@ TEXT runtime·nanotime(SB),NOSPLIT,$16
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW sig+0(FP), R3
MOVW how+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVW size+24(FP), R6
......
src/runtime/sys_linux_s390x.s
View file @ ab552aa3
......@@ -195,7 +195,7 @@ TEXT runtime·nanotime(SB),NOSPLIT,$16
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW sig+0(FP), R2
MOVW how+0(FP), R2
MOVD new+8(FP), R3
MOVD old+16(FP), R4
MOVW size+24(FP), R5
......
src/runtime/sys_netbsd_amd64.s
View file @ ab552aa3
......@@ -207,7 +207,7 @@ TEXT runtime·getcontext(SB),NOSPLIT,$-8
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVL mode+0(FP), DI // arg 1 - how
MOVL how+0(FP), DI // arg 1 - how
MOVQ new+8(FP), SI // arg 2 - set
MOVQ old+16(FP), DX // arg 3 - oset
MOVL $293, AX // sys_sigprocmask
......
src/runtime/sys_netbsd_arm.s
View file @ ab552aa3
......@@ -181,7 +181,7 @@ TEXT runtime·getcontext(SB),NOSPLIT,$-4
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW mode+0(FP), R0 // arg 1 - how
MOVW how+0(FP), R0 // arg 1 - how
MOVW new+4(FP), R1 // arg 2 - set
MOVW old+8(FP), R2 // arg 3 - oset
SWI $0xa00125 // sys_sigprocmask
......
src/runtime/sys_openbsd_386.s
View file @ ab552aa3
......@@ -187,7 +187,7 @@ TEXT runtime·sigaction(SB),NOSPLIT,$-4
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$-4
TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$-4
MOVL $48, AX // sys_sigprocmask
INT $0x80
JAE 2(PC)
......
src/runtime/sys_openbsd_amd64.s
View file @ ab552aa3
......@@ -218,8 +218,8 @@ TEXT runtime·sigaction(SB),NOSPLIT,$-8
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVL mode+0(FP), DI // arg 1 - how
TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVL how+0(FP), DI // arg 1 - how
MOVL new+4(FP), SI // arg 2 - set
MOVL $48, AX // sys_sigprocmask
SYSCALL
......
src/runtime/sys_openbsd_arm.s
View file @ ab552aa3
......@@ -198,8 +198,8 @@ TEXT runtime·sigaction(SB),NOSPLIT,$0
MOVW.CS R8, (R8)
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW mode+0(FP), R0 // arg 1 - mode
TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0 // arg 1 - mode
MOVW new+4(FP), R1 // arg 2 - new
MOVW $48, R12 // sys_sigprocmask
SWI $0
......
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