runtime, syscall: update openbsd for changes to syskill

Change the openbsd runtime to use the current sys_kill and sys_thrkill
system calls.

Prior to OpenBSD 5.9 the sys_kill system call could be used with both
processes and threads. In OpenBSD 5.9 this functionality was split into
a sys_kill system call for processes (with a new syscall number) and a
sys_thrkill system call for threads. The original/legacy system call was
retained in OpenBSD 5.9 and OpenBSD 6.0, however has been removed and
will not exist in the upcoming OpenBSD 6.1 release.

Note: This change is needed to make Go work on OpenBSD 6.1 (to be
released in May 2017) and should be included in the Go 1.8 release.
This change also drops support for OpenBSD 5.8, which is already an
unsupported OpenBSD release.

Change-Id: I525ed9b57c66c0c6f438dfa32feb29c7eefc72b0
Reviewed-on: https://go-review.googlesource.com/34093Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

api/except.txt

@@ -338,3 +338,7 @@ pkg unicode, const Version = "6.2.0"
 pkg unicode, const Version = "6.3.0"
 pkg unicode, const Version = "7.0.0"
 pkg unicode, const Version = "8.0.0"
+pkg syscall (openbsd-386), const SYS_KILL = 37
+pkg syscall (openbsd-386-cgo), const SYS_KILL = 37
+pkg syscall (openbsd-amd64), const SYS_KILL = 37
+pkg syscall (openbsd-amd64-cgo), const SYS_KILL = 37

src/runtime/sys_openbsd_386.s

@@ -79,14 +79,15 @@ TEXT runtime·usleep(SB),NOSPLIT,$24
 	INT	$0x80
 	RET
 
-TEXT runtime·raise(SB),NOSPLIT,$12
+TEXT runtime·raise(SB),NOSPLIT,$16
 	MOVL	$299, AX		// sys_getthrid
 	INT	$0x80
 	MOVL	$0, 0(SP)
-	MOVL	AX, 4(SP)		// arg 1 - pid
+	MOVL	AX, 4(SP)		// arg 1 - tid
 	MOVL	sig+0(FP), AX
 	MOVL	AX, 8(SP)		// arg 2 - signum
-	MOVL	$37, AX			// sys_kill
+	MOVL	$0, 12(SP)		// arg 3 - tcb
+	MOVL	$119, AX		// sys_thrkill
 	INT	$0x80
 	RET
 
@@ -97,7 +98,7 @@ TEXT runtime·raiseproc(SB),NOSPLIT,$12
 	MOVL	AX, 4(SP)		// arg 1 - pid
 	MOVL	sig+0(FP), AX
 	MOVL	AX, 8(SP)		// arg 2 - signum
-	MOVL	$37, AX			// sys_kill
+	MOVL	$122, AX		// sys_kill
 	INT	$0x80
 	RET
 

src/runtime/sys_openbsd_amd64.s

@@ -156,9 +156,10 @@ TEXT runtime·usleep(SB),NOSPLIT,$16
 TEXT runtime·raise(SB),NOSPLIT,$16
 	MOVL	$299, AX		// sys_getthrid
 	SYSCALL
-	MOVQ	AX, DI			// arg 1 - pid
+	MOVQ	AX, DI			// arg 1 - tid
 	MOVL	sig+0(FP), SI		// arg 2 - signum
-	MOVL	$37, AX			// sys_kill
+	MOVQ	$0, DX			// arg 3 - tcb
+	MOVL	$119, AX		// sys_thrkill
 	SYSCALL
 	RET
 
@@ -167,7 +168,7 @@ TEXT runtime·raiseproc(SB),NOSPLIT,$16
 	SYSCALL
 	MOVQ	AX, DI			// arg 1 - pid
 	MOVL	sig+0(FP), SI		// arg 2 - signum
-	MOVL	$37, AX			// sys_kill
+	MOVL	$122, AX		// sys_kill
 	SYSCALL
 	RET
 

src/runtime/sys_openbsd_arm.s

@@ -87,9 +87,10 @@ TEXT runtime·usleep(SB),NOSPLIT,$16
 TEXT runtime·raise(SB),NOSPLIT,$12
 	MOVW	$0x12B, R12
 	SWI	$0			// sys_getthrid
-					// arg 1 - pid, already in R0
+					// arg 1 - tid, already in R0
 	MOVW	sig+0(FP), R1		// arg 2 - signum
-	MOVW	$37, R12		// sys_kill
+	MOVW	$0, R2			// arg 3 - tcb
+	MOVW	$119, R12		// sys_thrkill
 	SWI	$0
 	RET
 
@@ -98,7 +99,7 @@ TEXT runtime·raiseproc(SB),NOSPLIT,$12
 	SWI	$0			// sys_getpid
 					// arg 1 - pid, already in R0
 	MOVW	sig+0(FP), R1		// arg 2 - signum
-	MOVW	$37, R12		// sys_kill
+	MOVW	$122, R12		// sys_kill
 	SWI	$0
 	RET
 

src/syscall/zsysnum_openbsd_386.go

@@ -41,7 +41,6 @@ const (
 	SYS_CHFLAGS        = 34  // { int sys_chflags(const char *path, u_int flags); }
 	SYS_FCHFLAGS       = 35  // { int sys_fchflags(int fd, u_int flags); }
 	SYS_SYNC           = 36  // { void sys_sync(void); }
-	SYS_KILL           = 37  // { int sys_kill(int pid, int signum); }
 	SYS_STAT           = 38  // { int sys_stat(const char *path, struct stat *ub); }
 	SYS_GETPPID        = 39  // { pid_t sys_getppid(void); }
 	SYS_LSTAT          = 40  // { int sys_lstat(const char *path, struct stat *ub); }
@@ -113,6 +112,7 @@ const (
 	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
 	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
 	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }
+	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
 	SYS_FCHMOD         = 124 // { int sys_fchmod(int fd, mode_t mode); }
 	SYS_SETREUID       = 126 // { int sys_setreuid(uid_t ruid, uid_t euid); }
 	SYS_SETREGID       = 127 // { int sys_setregid(gid_t rgid, gid_t egid); }

src/syscall/zsysnum_openbsd_amd64.go

@@ -41,7 +41,6 @@ const (
 	SYS_CHFLAGS        = 34  // { int sys_chflags(const char *path, u_int flags); }
 	SYS_FCHFLAGS       = 35  // { int sys_fchflags(int fd, u_int flags); }
 	SYS_SYNC           = 36  // { void sys_sync(void); }
-	SYS_KILL           = 37  // { int sys_kill(int pid, int signum); }
 	SYS_STAT           = 38  // { int sys_stat(const char *path, struct stat *ub); }
 	SYS_GETPPID        = 39  // { pid_t sys_getppid(void); }
 	SYS_LSTAT          = 40  // { int sys_lstat(const char *path, struct stat *ub); }
@@ -112,6 +111,7 @@ const (
 	SYS_GETSOCKOPT     = 118 // { int sys_getsockopt(int s, int level, int name, \
 	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
 	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
+	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
 	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }
 	SYS_FCHMOD         = 124 // { int sys_fchmod(int fd, mode_t mode); }
 	SYS_SETREUID       = 126 // { int sys_setreuid(uid_t ruid, uid_t euid); }

src/syscall/zsysnum_openbsd_arm.go

@@ -42,7 +42,6 @@ const (
 	SYS_CHFLAGS        = 34  // { int sys_chflags(const char *path, u_int flags); }
 	SYS_FCHFLAGS       = 35  // { int sys_fchflags(int fd, u_int flags); }
 	SYS_SYNC           = 36  // { void sys_sync(void); }
-	SYS_KILL           = 37  // { int sys_kill(int pid, int signum); }
 	SYS_STAT           = 38  // { int sys_stat(const char *path, struct stat *ub); }
 	SYS_GETPPID        = 39  // { pid_t sys_getppid(void); }
 	SYS_LSTAT          = 40  // { int sys_lstat(const char *path, struct stat *ub); }
@@ -118,6 +117,7 @@ const (
 	SYS_GETSOCKOPT     = 118 // { int sys_getsockopt(int s, int level, int name, \
 	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
 	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
+	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
 	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }
 	SYS_FCHMOD         = 124 // { int sys_fchmod(int fd, mode_t mode); }
 	SYS_SETREUID       = 126 // { int sys_setreuid(uid_t ruid, uid_t euid); }