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runtime: log all thread stack traces during GODEBUG=crash on Unix

Browse Source 
This extends https://golang.org/cl/2811, which only applied to Darwin
and GNU/Linux, to all Unix systems.

Fixes #9591.

Change-Id: Iec3fb438564ba2924b15b447c0480f87c0bfd009
Reviewed-on: https://go-review.googlesource.com/12661
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Ian Lance Taylor 2015-07-24 16:16:39 -07:00
parent a2cf0568e8
commit f0876a1a94
19 changed files with 380 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

135
src/runtime/crash_unix_test.go Normal file
View File

@ -0,0 +1,135 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package runtime_test
import (
"bytes"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"syscall"
"testing"
)
func TestCrashDumpsAllThreads(t *testing.T) {
switch runtime.GOOS {
case "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris":
default:
t.Skipf("skipping; not supported on %v", runtime.GOOS)
}
// We don't use executeTest because we need to kill the
// program while it is running.
testenv.MustHaveGoBuild(t)
checkStaleRuntime(t)
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
defer os.RemoveAll(dir)
if err := ioutil.WriteFile(filepath.Join(dir, "main.go"), []byte(crashDumpsAllThreadsSource), 0666); err != nil {
t.Fatalf("failed to create Go file: %v", err)
}
cmd := exec.Command("go", "build", "-o", "a.exe")
cmd.Dir = dir
out, err := testEnv(cmd).CombinedOutput()
if err != nil {
t.Fatalf("building source: %v\n%s", err, out)
}
cmd = exec.Command(filepath.Join(dir, "a.exe"))
cmd = testEnv(cmd)
cmd.Env = append(cmd.Env, "GOTRACEBACK=crash")
var outbuf bytes.Buffer
cmd.Stdout = &outbuf
cmd.Stderr = &outbuf
rp, wp, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
cmd.ExtraFiles = []*os.File{wp}
if err := cmd.Start(); err != nil {
t.Fatalf("starting program: %v", err)
}
if err := wp.Close(); err != nil {
t.Logf("closing write pipe: %v", err)
}
if _, err := rp.Read(make([]byte, 1)); err != nil {
t.Fatalf("reading from pipe: %v", err)
}
if err := cmd.Process.Signal(syscall.SIGQUIT); err != nil {
t.Fatalf("signal: %v", err)
}
// No point in checking the error return from Wait--we expect
// it to fail.
cmd.Wait()
// We want to see a stack trace for each thread.
// Before https://golang.org/cl/2811 running threads would say
// "goroutine running on other thread; stack unavailable".
out = outbuf.Bytes()
n := bytes.Count(out, []byte("main.loop("))
if n != 4 {
t.Errorf("found %d instances of main.loop; expected 4", n)
t.Logf("%s", out)
}
}
const crashDumpsAllThreadsSource = `
package main
import (
"fmt"
"os"
"runtime"
)
func main() {
const count = 4
runtime.GOMAXPROCS(count + 1)
chans := make([]chan bool, count)
for i := range chans {
chans[i] = make(chan bool)
go loop(i, chans[i])
}
// Wait for all the goroutines to start executing.
for _, c := range chans {
<-c
}
// Tell our parent that all the goroutines are executing.
if _, err := os.NewFile(3, "pipe").WriteString("x"); err != nil {
fmt.Fprintf(os.Stderr, "write to pipe failed: %v\n", err)
os.Exit(2)
}
select {}
}
func loop(i int, c chan bool) {
close(c)
for {
for j := 0; j < 0x7fffffff; j++ {
}
}
}
`

34
src/runtime/signal_386.go
View File

@ -170,25 +170,21 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
}
if docrash {
// TODO(rsc): Implement raiseproc on other systems
// and then add to this if condition.
if GOOS == "linux" {
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crash()
}

34
src/runtime/signal_amd64x.go
View File

@ -181,25 +181,21 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
}
if docrash {
// TODO(rsc): Implement raiseproc on other systems
// and then add to this if condition.
if GOOS == "darwin" || GOOS == "linux" {
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crash()
}

35
src/runtime/signal_arm.go
View File

@ -32,6 +32,8 @@ func dumpregs(c *sigctxt) {
print("fault ", hex(c.fault()), "\n")
}
var crashing int32
// May run during STW, so write barriers are not allowed.
//go:nowritebarrier
func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
@ -106,7 +108,10 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
_g_.m.throwing = 1
_g_.m.caughtsig.set(gp)
startpanic()
if crashing == 0 {
startpanic()
}
if sig < uint32(len(sigtable)) {
print(sigtable[sig].name, "\n")
@ -114,7 +119,7 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
print("Signal ", sig, "\n")
}
print("PC=", hex(c.pc()), "\n")
print("PC=", hex(c.pc()), " m=", _g_.m.id, "\n")
if _g_.m.lockedg != nil && _g_.m.ncgo > 0 && gp == _g_.m.g0 {
print("signal arrived during cgo execution\n")
gp = _g_.m.lockedg
@ -125,12 +130,34 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
if gotraceback(&docrash) > 0 {
goroutineheader(gp)
tracebacktrap(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.lr()), gp)
tracebackothers(gp)
print("\n")
if crashing > 0 && gp != _g_.m.curg && _g_.m.curg != nil && readgstatus(_g_.m.curg)&^_Gscan == _Grunning {
// tracebackothers on original m skipped this one; trace it now.
goroutineheader(_g_.m.curg)
traceback(^uintptr(0), ^uintptr(0), 0, gp)
} else if crashing == 0 {
tracebackothers(gp)
print("\n")
}
dumpregs(c)
}
if docrash {
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crash()
}

35
src/runtime/signal_arm64.go
View File

@ -45,6 +45,8 @@ func dumpregs(c *sigctxt) {
print("fault ", hex(c.fault()), "\n")
}
var crashing int32
// May run during STW, so write barriers are not allowed.
//go:nowritebarrier
func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
@ -119,7 +121,10 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
_g_.m.throwing = 1
_g_.m.caughtsig.set(gp)
startpanic()
if crashing == 0 {
startpanic()
}
if sig < uint32(len(sigtable)) {
print(sigtable[sig].name, "\n")
@ -127,7 +132,7 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
print("Signal ", sig, "\n")
}
print("PC=", hex(c.pc()), "\n")
print("PC=", hex(c.pc()), " m=", _g_.m.id, "\n")
if _g_.m.lockedg != nil && _g_.m.ncgo > 0 && gp == _g_.m.g0 {
print("signal arrived during cgo execution\n")
gp = _g_.m.lockedg
@ -138,12 +143,34 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
if gotraceback(&docrash) > 0 {
goroutineheader(gp)
tracebacktrap(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.lr()), gp)
tracebackothers(gp)
print("\n")
if crashing > 0 && gp != _g_.m.curg && _g_.m.curg != nil && readgstatus(_g_.m.curg)&^_Gscan == _Grunning {
// tracebackothers on original m skipped this one; trace it now.
goroutineheader(_g_.m.curg)
traceback(^uintptr(0), ^uintptr(0), 0, gp)
} else if crashing == 0 {
tracebackothers(gp)
print("\n")
}
dumpregs(c)
}
if docrash {
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crash()
}

35
src/runtime/signal_ppc64x.go
View File

@ -50,6 +50,8 @@ func dumpregs(c *sigctxt) {
print("trap ", hex(c.trap()), "\n")
}
var crashing int32
// May run during STW, so write barriers are not allowed.
//go:nowritebarrier
func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
@ -124,7 +126,10 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
_g_.m.throwing = 1
_g_.m.caughtsig.set(gp)
startpanic()
if crashing == 0 {
startpanic()
}
if sig < uint32(len(sigtable)) {
print(sigtable[sig].name, "\n")
@ -132,7 +137,7 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
print("Signal ", sig, "\n")
}
print("PC=", hex(c.pc()), "\n")
print("PC=", hex(c.pc()), " m=", _g_.m.id, "\n")
if _g_.m.lockedg != nil && _g_.m.ncgo > 0 && gp == _g_.m.g0 {
print("signal arrived during cgo execution\n")
gp = _g_.m.lockedg
@ -143,12 +148,34 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
if gotraceback(&docrash) > 0 {
goroutineheader(gp)
tracebacktrap(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.link()), gp)
tracebackothers(gp)
print("\n")
if crashing > 0 && gp != _g_.m.curg && _g_.m.curg != nil && readgstatus(_g_.m.curg)&^_Gscan == _Grunning {
// tracebackothers on original m skipped this one; trace it now.
goroutineheader(_g_.m.curg)
traceback(^uintptr(0), ^uintptr(0), 0, gp)
} else if crashing == 0 {
tracebackothers(gp)
print("\n")
}
dumpregs(c)
}
if docrash {
crashing++
if crashing < sched.mcount {
// There are other m's that need to dump their stacks.
// Relay SIGQUIT to the next m by sending it to the current process.
// All m's that have already received SIGQUIT have signal masks blocking
// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
// When the last m receives the SIGQUIT, it will fall through to the call to
// crash below. Just in case the relaying gets botched, each m involved in
// the relay sleeps for 5 seconds and then does the crash/exit itself.
// In expected operation, the last m has received the SIGQUIT and run
// crash/exit and the process is gone, all long before any of the
// 5-second sleeps have finished.
print("\n-----\n\n")
raiseproc(_SIGQUIT)
usleep(5 * 1000 * 1000)
}
crash()
}

7
src/runtime/sys_darwin_arm.s
View File

@ -97,7 +97,12 @@ TEXT runtime·exit1(SB),NOSPLIT,$0
MOVW $1003, R1
MOVW R0, (R1) // fail hard
TEXT runtime·raise(SB),NOSPLIT,$24
TEXT runtime·raise(SB),NOSPLIT,$0
// Ideally we'd send the signal to the current thread,
// not the whole process, but that's too hard on OS X.
JMP runtime·raiseproc(SB)
TEXT runtime·raiseproc(SB),NOSPLIT,$24
MOVW $SYS_getpid, R12
SWI $0x80
// arg 1 pid already in R0 from getpid

5
src/runtime/sys_darwin_arm64.s
View File

@ -98,6 +98,11 @@ TEXT runtime·exit1(SB),NOSPLIT,$0
MOVD R0, (R1) // fail hard
TEXT runtime·raise(SB),NOSPLIT,$0
// Ideally we'd send the signal to the current thread,
// not the whole process, but that's too hard on OS X.
JMP runtime·raiseproc(SB)
TEXT runtime·raiseproc(SB),NOSPLIT,$0
MOVW $SYS_getpid, R16
SVC $0x80
// arg 1 pid already in R0 from getpid

9
src/runtime/sys_dragonfly_amd64.s
View File

@ -131,6 +131,15 @@ TEXT runtime·raise(SB),NOSPLIT,$16
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
MOVL $20, AX // getpid
SYSCALL
MOVQ AX, DI // arg 1 - pid
MOVL sig+0(FP), SI // arg 2 - signum
MOVL $37, AX // kill
SYSCALL
RET
TEXT runtime·setitimer(SB), NOSPLIT, $-8
MOVL mode+0(FP), DI
MOVQ new+8(FP), SI

12
src/runtime/sys_freebsd_386.s
View File

@ -112,6 +112,18 @@ TEXT runtime·raise(SB),NOSPLIT,$16
INT $0x80
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$16
// getpid
MOVL $20, AX
INT $0x80
// kill(self, sig)
MOVL AX, 4(SP)
MOVL sig+0(FP), AX
MOVL AX, 8(SP)
MOVL $37, AX
INT $0x80
RET
TEXT runtime·mmap(SB),NOSPLIT,$32
LEAL addr+0(FP), SI
LEAL 4(SP), DI

11
src/runtime/sys_freebsd_amd64.s
View File

@ -123,6 +123,17 @@ TEXT runtime·raise(SB),NOSPLIT,$16
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
// getpid
MOVL $20, AX
SYSCALL
// kill(self, sig)
MOVQ AX, DI // arg 1 pid
MOVL sig+0(FP), SI // arg 2 sig
MOVL $37, AX
SYSCALL
RET
TEXT runtime·setitimer(SB), NOSPLIT, $-8
MOVL mode+0(FP), DI
MOVQ new+8(FP), SI

13
src/runtime/sys_freebsd_arm.s
View File

@ -18,6 +18,8 @@
#define SYS_write (SYS_BASE + 4)
#define SYS_open (SYS_BASE + 5)
#define SYS_close (SYS_BASE + 6)
#define SYS_getpid (SYS_BASE + 20)
#define SYS_kill (SYS_BASE + 37)
#define SYS_sigaltstack (SYS_BASE + 53)
#define SYS_munmap (SYS_BASE + 73)
#define SYS_madvise (SYS_BASE + 75)
@ -145,6 +147,17 @@ TEXT runtime·raise(SB),NOSPLIT,$8
SWI $0
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
// getpid
MOVW $SYS_getpid, R7
SWI $0
// kill(self, sig)
// arg 1 - pid, now in R0
MOVW sig+0(FP), R1 // arg 2 - signal
MOVW $SYS_kill, R7
SWI $0
RET
TEXT runtime·setitimer(SB), NOSPLIT, $-8
MOVW mode+0(FP), R0
MOVW new+4(FP), R1

11
src/runtime/sys_linux_arm64.s
View File

@ -32,7 +32,9 @@
#define SYS_getrlimit 163
#define SYS_madvise 233
#define SYS_mincore 232
#define SYS_getpid 172
#define SYS_gettid 178
#define SYS_kill 129
#define SYS_tkill 130
#define SYS_futex 98
#define SYS_sched_getaffinity 123
@ -151,6 +153,15 @@ TEXT runtime·raise(SB),NOSPLIT,$-8
SVC
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$-8
MOVD $SYS_getpid, R8
SVC
MOVW R0, R0 // arg 1 pid
MOVW sig+0(FP), R1 // arg 2
MOVD $SYS_kill, R8
SVC
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8-24
MOVW mode+0(FP), R0
MOVD new+8(FP), R1

11
src/runtime/sys_netbsd_386.s
View File

@ -86,6 +86,17 @@ TEXT runtime·raise(SB),NOSPLIT,$12
INT $0x80
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$12
MOVL $20, AX // sys_getpid
INT $0x80
MOVL $0, 0(SP)
MOVL AX, 4(SP) // arg 1 - pid
MOVL sig+0(FP), AX
MOVL AX, 8(SP) // arg 2 - signo
MOVL $37, AX // sys_kill
INT $0x80
RET
TEXT runtime·mmap(SB),NOSPLIT,$36
LEAL addr+0(FP), SI
LEAL 4(SP), DI

9
src/runtime/sys_netbsd_amd64.s
View File

@ -152,6 +152,15 @@ TEXT runtime·raise(SB),NOSPLIT,$16
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$16
MOVL $20, AX // sys_getpid
SYSCALL
MOVQ AX, DI // arg 1 - pid
MOVL sig+0(FP), SI // arg 2 - signo
MOVL $37, AX // sys_kill
SYSCALL
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8
MOVL mode+0(FP), DI // arg 1 - which
MOVQ new+8(FP), SI // arg 2 - itv

6
src/runtime/sys_netbsd_arm.s
View File

@ -127,6 +127,12 @@ TEXT runtime·raise(SB),NOSPLIT,$16
SWI $0xa0013e // sys__lwp_kill
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$16
SWI $0xa00014 // sys_getpid, the returned R0 is arg 1
MOVW sig+0(FP), R1 // arg 2 - signal
SWI $0xa00025 // sys_kill
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-4
MOVW mode+0(FP), R0 // arg 1 - which
MOVW new+4(FP), R1 // arg 2 - itv

11
src/runtime/sys_openbsd_386.s
View File

@ -90,6 +90,17 @@ TEXT runtime·raise(SB),NOSPLIT,$12
INT $0x80
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$12
MOVL $20, AX // sys_getpid
INT $0x80
MOVL $0, 0(SP)
MOVL AX, 4(SP) // arg 1 - pid
MOVL sig+0(FP), AX
MOVL AX, 8(SP) // arg 2 - signum
MOVL $37, AX // sys_kill
INT $0x80
RET
TEXT runtime·mmap(SB),NOSPLIT,$36
LEAL addr+0(FP), SI
LEAL 4(SP), DI

9
src/runtime/sys_openbsd_amd64.s
View File

@ -162,6 +162,15 @@ TEXT runtime·raise(SB),NOSPLIT,$16
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$16
MOVL $20, AX // sys_getpid
SYSCALL
MOVQ AX, DI // arg 1 - pid
MOVL sig+0(FP), SI // arg 2 - signum
MOVL $37, AX // sys_kill
SYSCALL
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8
MOVL mode+0(FP), DI // arg 1 - which
MOVQ new+8(FP), SI // arg 2 - itv

9
src/runtime/sys_openbsd_arm.s
View File

@ -96,6 +96,15 @@ TEXT runtime·raise(SB),NOSPLIT,$12
SWI $0
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$12
MOVW $20, R12
SWI $0 // sys_getpid
// arg 1 - pid, already in R0
MOVW sig+0(FP), R1 // arg 2 - signum
MOVW $37, R12 // sys_kill
SWI $0
RET
TEXT runtime·mmap(SB),NOSPLIT,$16
MOVW addr+0(FP), R0 // arg 1 - addr
MOVW len+4(FP), R1 // arg 2 - len