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runtime: switch openbsd/arm to pthreads

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

Update #36435

Change-Id: Ia8749e3723a9967905c33b6d93dfd9be797a486c
Reviewed-on: https://go-review.googlesource.com/c/go/+/315790
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Joel Sing 2021-01-31 04:21:47 +11:00
parent 5203357eba
commit 8ec8f6aa87
8 changed files with 153 additions and 94 deletions
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13
src/runtime/asm_arm.s
View file

@ -142,6 +142,11 @@ TEXT runtime·rt0_go(SB),NOSPLIT|NOFRAME|TOPFRAME,$0
BL runtime·emptyfunc(SB) // fault if stack check is wrong
#ifdef GOOS_openbsd
// Save g to TLS so that it is available from signal trampoline.
BL runtime·save_g(SB)
#endif
BL runtime·_initcgo(SB) // will clobber R0-R3
// update stackguard after _cgo_init
@ -633,9 +638,13 @@ TEXT ·cgocallback(SB),NOSPLIT,$12-12
NO_LOCAL_POINTERS
// Load m and g from thread-local storage.
#ifdef GOOS_openbsd
BL runtime·load_g(SB)
#else
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BL.NE runtime·load_g(SB)
#endif
// If g is nil, Go did not create the current thread.
// Call needm to obtain one for temporary use.
@ -744,6 +753,9 @@ TEXT setg<>(SB),NOSPLIT|NOFRAME,$0-0
// Save g to thread-local storage.
#ifdef GOOS_windows
B runtime·save_g(SB)
#else
#ifdef GOOS_openbsd
B runtime·save_g(SB)
#else
MOVB runtime·iscgo(SB), R0
CMP $0, R0
@ -753,6 +765,7 @@ TEXT setg<>(SB),NOSPLIT|NOFRAME,$0-0
MOVW g, R0
RET
#endif
#endif
TEXT runtime·emptyfunc(SB),0,$0-0
RET

9
src/runtime/defs_openbsd_arm.go
View file

@ -30,6 +30,8 @@ const (
_SA_RESTART = 0x2
_SA_ONSTACK = 0x1
_PTHREAD_CREATE_DETACHED = 0x1
_SIGHUP = 0x1
_SIGINT = 0x2
_SIGQUIT = 0x3
@ -174,3 +176,10 @@ type keventt struct {
udata *byte
pad_cgo_1 [4]byte
}
type pthread uintptr
type pthreadattr uintptr
type pthreadcond uintptr
type pthreadcondattr uintptr
type pthreadmutex uintptr
type pthreadmutexattr uintptr

4
src/runtime/os_openbsd_libc.go
View file

@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build (openbsd && 386) || (openbsd && amd64) || (openbsd && arm64)
// +build openbsd,386 openbsd,amd64 openbsd,arm64
//go:build (openbsd && 386) || (openbsd && amd64) || (openbsd && arm) || (openbsd && arm64)
// +build openbsd,386 openbsd,amd64 openbsd,arm openbsd,arm64
package runtime

4
src/runtime/os_openbsd_syscall.go
View file

@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build openbsd && !386 && openbsd && !amd64 && openbsd && !arm64
// +build openbsd,!386,openbsd,!amd64,openbsd,!arm64
//go:build openbsd && !386 && openbsd && !amd64 && openbsd && !arm && openbsd && !arm64
// +build openbsd,!386,openbsd,!amd64,openbsd,!arm,openbsd,!arm64
package runtime

2
src/runtime/proc.go
View file

@ -1316,7 +1316,7 @@ func mStackIsSystemAllocated() bool {
return true
case "openbsd":
switch GOARCH {
case "386", "amd64", "arm64":
case "386", "amd64", "arm", "arm64":
return true
}
}

4
src/runtime/sys_libc.go
View file

@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || (openbsd && 386) || (openbsd && amd64) || (openbsd && arm64)
// +build darwin openbsd,386 openbsd,amd64 openbsd,arm64
//go:build darwin || (openbsd && 386) || (openbsd && amd64) || (openbsd && arm) || (openbsd && arm64)
// +build darwin openbsd,386 openbsd,amd64 openbsd,arm openbsd,arm64
package runtime

4
src/runtime/sys_openbsd.go
View file

@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build (openbsd && 386) || (openbsd && amd64) || (openbsd && arm64)
// +build openbsd,386 openbsd,amd64 openbsd,arm64
//go:build (openbsd && 386) || (openbsd && amd64) || (openbsd && arm) || (openbsd && arm64)
// +build openbsd,386 openbsd,amd64 openbsd,arm openbsd,arm64
package runtime

205
src/runtime/sys_openbsd_arm.s
View file

@ -25,6 +25,127 @@
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,$0
// R0 points to the m.
// We are already on m's g0 stack.
// Save callee-save registers.
MOVM.DB.W [R4-R11], (R13)
MOVW m_g0(R0), g
BL runtime·save_g(SB)
BL runtime·mstart(SB)
// Restore callee-save registers.
MOVM.IA.W (R13), [R4-R11]
// 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).
MOVW $0, R0
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
MOVW sig+4(FP), R0
MOVW info+8(FP), R1
MOVW ctx+12(FP), R2
MOVW fn+0(FP), R3
MOVW R13, R9
SUB $24, R13
BIC $0x7, R13 // alignment for ELF ABI
BL (R3)
MOVW R9, R13
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$0
// Reserve space for callee-save registers and arguments.
MOVM.DB.W [R4-R11], (R13)
SUB $16, R13
// If called from an external code context, g will not be set.
// Save R0, since runtime·load_g will clobber it.
MOVW R0, 4(R13) // signum
BL runtime·load_g(SB)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
BL runtime·sigtrampgo(SB)
// Restore callee-save registers.
ADD $16, R13
MOVM.IA.W (R13), [R4-R11]
RET
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
B runtime·armPublicationBarrier(SB)
// TODO(jsing): OpenBSD only supports GOARM=7 machines... this
// should not be needed, however the linker still allows GOARM=5
// on this platform.
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
MOVM.WP [R1, R2, R3, R12], (R13)
MOVW $330, R12 // sys___get_tcb
INVOKE_SYSCALL
MOVM.IAW (R13), [R1, R2, R3, R12]
RET
// These trampolines help convert from Go calling convention to C calling convention.
// They should be called with asmcgocall - note that while asmcgocall does
// stack alignment, creation of a frame undoes it again.
// 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
MOVW R13, R9
BIC $0x7, R13 // align for ELF ABI
MOVW 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_init(SB)
MOVW R9, R13
RET
TEXT runtime·pthread_attr_destroy_trampoline(SB),NOSPLIT,$0
MOVW R13, R9
BIC $0x7, R13 // align for ELF ABI
MOVW 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_destroy(SB)
MOVW R9, R13
RET
TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0
MOVW R13, R9
BIC $0x7, R13 // align for ELF ABI
MOVW 4(R0), R1 // arg 2 size
MOVW 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_getstacksize(SB)
MOVW R9, R13
RET
TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
MOVW R13, R9
BIC $0x7, R13 // align for ELF ABI
MOVW 4(R0), R1 // arg 2 state
MOVW 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_setdetachstate(SB)
MOVW R9, R13
RET
TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
MOVW R13, R9
SUB $16, R13
BIC $0x7, R13 // align for ELF ABI
MOVW 0(R0), R1 // arg 2 attr
MOVW 4(R0), R2 // arg 3 start
MOVW 8(R0), R3 // arg 4 arg
MOVW R13, R0 // arg 1 &threadid (discarded)
BL libc_pthread_create(SB)
MOVW R9, R13
RET
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R0 // arg 1 - status
@ -247,80 +368,6 @@ TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVW R0, ret+8(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
MOVW sig+4(FP), R0
MOVW info+8(FP), R1
MOVW ctx+12(FP), R2
MOVW fn+0(FP), R11
MOVW R13, R4
SUB $24, R13
BIC $0x7, R13 // alignment for ELF ABI
BL (R11)
MOVW R4, R13
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$0
// Reserve space for callee-save registers and arguments.
MOVM.DB.W [R4-R11], (R13)
SUB $16, R13
// If called from an external code context, g will not be set.
// Save R0, since runtime·load_g will clobber it.
MOVW R0, 4(R13) // signum
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BL.NE runtime·load_g(SB)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
BL runtime·sigtrampgo(SB)
// Restore callee-save registers.
ADD $16, R13
MOVM.IA.W (R13), [R4-R11]
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.
MOVW mm+8(FP), R4
MOVW gg+12(FP), R5
MOVW fn+16(FP), R6
MOVW param+0(FP), R0 // arg 1 - param
MOVW psize+4(FP), R1 // arg 2 - psize
MOVW $8, R12 // sys___tfork
INVOKE_SYSCALL
// Return if syscall failed.
B.CC 4(PC)
RSB $0, R0
MOVW R0, ret+20(FP)
RET
// In parent, return.
CMP $0, R0
BEQ 3(PC)
MOVW R0, ret+20(FP)
RET
// Initialise m, g.
MOVW R5, g
MOVW R4, g_m(g)
// Paranoia; check that stack splitting code works.
BL runtime·emptyfunc(SB)
// Call fn.
BL (R6)
// fn should never return.
MOVW $2, R8 // crash if reached
MOVW R8, (R8)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVW new+0(FP), R0 // arg 1 - new sigaltstack
MOVW old+4(FP), R1 // arg 2 - old sigaltstack
@ -423,13 +470,3 @@ TEXT runtime·setNonblock(SB),NOSPLIT,$0-4
MOVW $92, R12
INVOKE_SYSCALL
RET
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
B runtime·armPublicationBarrier(SB)
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
MOVM.WP [R1, R2, R3, R12], (R13)
MOVW $330, R12 // sys___get_tcb
INVOKE_SYSCALL
MOVM.IAW (R13), [R1, R2, R3, R12]
RET