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runtime: switch openbsd/arm64 to pthreads

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This switches openbsd/arm64 to thread creation via pthreads, rather than doing
direct system calls.

Update #36435

Change-Id: I7cf60fa954f92628e05f15d2732833a2fbdccdb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/250182
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-08-25 01:29:02 +10:00
parent d95ca91380
commit 3d40895e36
8 changed files with 195 additions and 108 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/runtime/defs_openbsd_arm64.go
View File

@ -31,6 +31,8 @@ const (
_SA_RESTART = 0x2
_SA_ONSTACK = 0x1
_PTHREAD_CREATE_DETACHED = 0x1
_SIGHUP = 0x1
_SIGINT = 0x2
_SIGQUIT = 0x3
@ -157,3 +159,10 @@ type keventt struct {
data int64
udata *byte
}
type pthread uintptr
type pthreadattr uintptr
type pthreadcond uintptr
type pthreadcondattr uintptr
type pthreadmutex uintptr
type pthreadmutexattr uintptr

2
src/runtime/os_openbsd_libc.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build openbsd,amd64
// +build openbsd,amd64 openbsd,arm64
package runtime

1
src/runtime/os_openbsd_syscall.go
View File

@ -3,6 +3,7 @@
// license that can be found in the LICENSE file.
// +build openbsd,!amd64
// +build openbsd,!arm64
package runtime

2
src/runtime/proc.go
View File

@ -1224,7 +1224,7 @@ func mStackIsSystemAllocated() bool {
return true
case "openbsd":
switch GOARCH {
case "amd64":
case "amd64", "arm64":
return true
}
}

2
src/runtime/sys_libc.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin openbsd,amd64
// +build darwin openbsd,amd64 openbsd,arm64
package runtime

2
src/runtime/sys_openbsd.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build openbsd,amd64
// +build openbsd,amd64 openbsd,arm64
package runtime

281
src/runtime/sys_openbsd_arm64.s
View File

@ -3,7 +3,9 @@
// license that can be found in the LICENSE file.
//
// System calls and other sys.stuff for arm64, OpenBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
// System calls are implemented in libc/libpthread, this file
// contains trampolines that convert from Go to C calling convention.
// Some direct system call implementations currently remain.
//
#include "go_asm.h"
@ -24,6 +26,180 @@
NOOP; \
NOOP
// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$160
// R0 points to the m.
// We are already on m's g0 stack.
// Save callee-save registers.
MOVD R19, 8(RSP)
MOVD R20, 16(RSP)
MOVD R21, 24(RSP)
MOVD R22, 32(RSP)
MOVD R23, 40(RSP)
MOVD R24, 48(RSP)
MOVD R25, 56(RSP)
MOVD R26, 64(RSP)
MOVD R27, 72(RSP)
MOVD g, 80(RSP)
MOVD R29, 88(RSP)
FMOVD F8, 96(RSP)
FMOVD F9, 104(RSP)
FMOVD F10, 112(RSP)
FMOVD F11, 120(RSP)
FMOVD F12, 128(RSP)
FMOVD F13, 136(RSP)
FMOVD F14, 144(RSP)
FMOVD F15, 152(RSP)
MOVD m_g0(R0), g
BL runtime·save_g(SB)
BL runtime·mstart(SB)
// Restore callee-save registers.
MOVD 8(RSP), R19
MOVD 16(RSP), R20
MOVD 24(RSP), R21
MOVD 32(RSP), R22
MOVD 40(RSP), R23
MOVD 48(RSP), R24
MOVD 56(RSP), R25
MOVD 64(RSP), R26
MOVD 72(RSP), R27
MOVD 80(RSP), g
MOVD 88(RSP), R29
FMOVD 96(RSP), F8
FMOVD 104(RSP), F9
FMOVD 112(RSP), F10
FMOVD 120(RSP), F11
FMOVD 128(RSP), F12
FMOVD 136(RSP), F13
FMOVD 144(RSP), F14
FMOVD 152(RSP), F15
// 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).
MOVD $0, R0
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R0
MOVD info+16(FP), R1
MOVD ctx+24(FP), R2
MOVD fn+0(FP), R11
BL (R11) // Alignment for ELF ABI?
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$192
// Save callee-save registers in the case of signal forwarding.
// Please refer to https://golang.org/issue/31827 .
MOVD R19, 8*4(RSP)
MOVD R20, 8*5(RSP)
MOVD R21, 8*6(RSP)
MOVD R22, 8*7(RSP)
MOVD R23, 8*8(RSP)
MOVD R24, 8*9(RSP)
MOVD R25, 8*10(RSP)
MOVD R26, 8*11(RSP)
MOVD R27, 8*12(RSP)
MOVD g, 8*13(RSP)
MOVD R29, 8*14(RSP)
FMOVD F8, 8*15(RSP)
FMOVD F9, 8*16(RSP)
FMOVD F10, 8*17(RSP)
FMOVD F11, 8*18(RSP)
FMOVD F12, 8*19(RSP)
FMOVD F13, 8*20(RSP)
FMOVD F14, 8*21(RSP)
FMOVD F15, 8*22(RSP)
// If called from an external code context, g will not be set.
// Save R0, since runtime·load_g will clobber it.
MOVW R0, 8(RSP) // signum
BL runtime·load_g(SB)
MOVD R1, 16(RSP)
MOVD R2, 24(RSP)
BL runtime·sigtrampgo(SB)
// Restore callee-save registers.
MOVD 8*4(RSP), R19
MOVD 8*5(RSP), R20
MOVD 8*6(RSP), R21
MOVD 8*7(RSP), R22
MOVD 8*8(RSP), R23
MOVD 8*9(RSP), R24
MOVD 8*10(RSP), R25
MOVD 8*11(RSP), R26
MOVD 8*12(RSP), R27
MOVD 8*13(RSP), g
MOVD 8*14(RSP), R29
FMOVD 8*15(RSP), F8
FMOVD 8*16(RSP), F9
FMOVD 8*17(RSP), F10
FMOVD 8*18(RSP), F11
FMOVD 8*19(RSP), F12
FMOVD 8*20(RSP), F13
FMOVD 8*21(RSP), F14
FMOVD 8*22(RSP), F15
RET
//
// These trampolines help convert from Go calling convention to C calling convention.
// They should be called with asmcgocall.
// A pointer to the arguments is passed in R0.
// A single int32 result is returned in R0.
// (For more results, make an args/results structure.)
TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_init(SB)
RET
TEXT runtime·pthread_attr_destroy_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_destroy(SB)
RET
TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - size
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_getstacksize(SB)
RET
TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - state
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_setdetachstate(SB)
RET
TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R1 // arg 2 - attr
MOVD 8(R0), R2 // arg 3 - start
MOVD 16(R0), R3 // arg 4 - arg
SUB $16, RSP
MOVD RSP, R0 // arg 1 - &threadid (discard)
CALL libc_pthread_create(SB)
ADD $16, RSP
RET
TEXT runtime·pthread_self_trampoline(SB),NOSPLIT,$0
MOVD R0, R19 // pointer to args
CALL libc_pthread_self(SB)
MOVD R0, 0(R19) // return value
RET
TEXT runtime·pthread_kill_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - sig
MOVD 0(R0), R0 // arg 1 - thread
CALL libc_pthread_kill(SB)
RET
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R0 // arg 1 - status
@ -248,109 +424,6 @@ TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVW R0, ret+8(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R0
MOVD info+16(FP), R1
MOVD ctx+24(FP), R2
MOVD fn+0(FP), R11
BL (R11) // Alignment for ELF ABI?
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$192
// Save callee-save registers in the case of signal forwarding.
// Please refer to https://golang.org/issue/31827 .
MOVD R19, 8*4(RSP)
MOVD R20, 8*5(RSP)
MOVD R21, 8*6(RSP)
MOVD R22, 8*7(RSP)
MOVD R23, 8*8(RSP)
MOVD R24, 8*9(RSP)
MOVD R25, 8*10(RSP)
MOVD R26, 8*11(RSP)
MOVD R27, 8*12(RSP)
MOVD g, 8*13(RSP)
MOVD R29, 8*14(RSP)
FMOVD F8, 8*15(RSP)
FMOVD F9, 8*16(RSP)
FMOVD F10, 8*17(RSP)
FMOVD F11, 8*18(RSP)
FMOVD F12, 8*19(RSP)
FMOVD F13, 8*20(RSP)
FMOVD F14, 8*21(RSP)
FMOVD F15, 8*22(RSP)
// If called from an external code context, g will not be set.
// Save R0, since runtime·load_g will clobber it.
MOVW R0, 8(RSP) // signum
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BEQ 2(PC)
BL runtime·load_g(SB)
MOVD R1, 16(RSP)
MOVD R2, 24(RSP)
BL runtime·sigtrampgo(SB)
// Restore callee-save registers.
MOVD 8*4(RSP), R19
MOVD 8*5(RSP), R20
MOVD 8*6(RSP), R21
MOVD 8*7(RSP), R22
MOVD 8*8(RSP), R23
MOVD 8*9(RSP), R24
MOVD 8*10(RSP), R25
MOVD 8*11(RSP), R26
MOVD 8*12(RSP), R27
MOVD 8*13(RSP), g
MOVD 8*14(RSP), R29
FMOVD 8*15(RSP), F8
FMOVD 8*16(RSP), F9
FMOVD 8*17(RSP), F10
FMOVD 8*18(RSP), F11
FMOVD 8*19(RSP), F12
FMOVD 8*20(RSP), F13
FMOVD 8*21(RSP), F14
FMOVD 8*22(RSP), F15
RET
// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
TEXT runtime·tfork(SB),NOSPLIT,$0
// Copy mp, gp and fn off parent stack for use by child.
MOVD mm+16(FP), R4
MOVD gg+24(FP), R5
MOVD fn+32(FP), R6
MOVD param+0(FP), R0 // arg 1 - param
MOVD psize+8(FP), R1 // arg 2 - psize
MOVD $8, R8 // sys___tfork
INVOKE_SYSCALL
// Return if syscall failed.
BCC 4(PC)
NEG R0, R0
MOVW R0, ret+40(FP)
RET
// In parent, return.
CMP $0, R0
BEQ 3(PC)
MOVW R0, ret+40(FP)
RET
// Initialise m, g.
MOVD R5, g
MOVD R4, g_m(g)
// Call fn.
BL (R6)
// fn should never return.
MOVD $2, R8 // crash if reached
MOVD R8, (R8)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVD new+0(FP), R0 // arg 1 - new sigaltstack
MOVD old+8(FP), R1 // arg 2 - old sigaltstack

4
src/runtime/tls_arm64.s
View File

@ -10,8 +10,10 @@
TEXT runtime·load_g(SB),NOSPLIT,$0
#ifndef TLS_darwin
#ifndef GOOS_openbsd
MOVB runtime·iscgo(SB), R0
CBZ R0, nocgo
#endif
#endif
MRS_TPIDR_R0
@ -27,8 +29,10 @@ nocgo:
TEXT runtime·save_g(SB),NOSPLIT,$0
#ifndef TLS_darwin
#ifndef GOOS_openbsd
MOVB runtime·iscgo(SB), R0
CBZ R0, nocgo
#endif
#endif
MRS_TPIDR_R0