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runtime: implement pthread functions for darwin/arm64 

They were not needed when Go only produced binaries with cgo suppport.
Now that Go is about to run self-hosted on iOS we do need these.

Updates #31722

Change-Id: If233aa2b31edc7b1c2dcac68974f9fba0604f9a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/174300
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Elias Naur 2019-04-30 09:18:23 +02:00
parent e0ac75d2ab
commit 9f12e2e04b
1 changed files with 72 additions and 13 deletions
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85
src/runtime/sys_darwin_arm64.s
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@ -304,33 +304,92 @@ TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
RET
// Thread related functions
// Note: On darwin/arm64, the runtime always use runtime/cgo to
// create threads, so all thread related functions will just exit with a
// unique status.
// 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
MOVW $44, R0
BL libc_exit(SB)
// R0 points to the m.
// We are already on m's g0 stack.
// Save callee-save registers.
SUB $144, RSP
MOVD R19, 0(RSP)
MOVD R20, 8(RSP)
MOVD R21, 16(RSP)
MOVD R22, 24(RSP)
MOVD R23, 32(RSP)
MOVD R24, 40(RSP)
MOVD R25, 48(RSP)
MOVD R26, 56(RSP)
MOVD R27, 64(RSP)
MOVD g, 72(RSP)
FMOVD F8, 80(RSP)
FMOVD F9, 88(RSP)
FMOVD F10, 96(RSP)
FMOVD F11, 104(RSP)
FMOVD F12, 112(RSP)
FMOVD F13, 120(RSP)
FMOVD F14, 128(RSP)
FMOVD F15, 136(RSP)
MOVD m_g0(R0), g
BL runtime·mstart(SB)
// Restore callee-save registers.
MOVD 0(RSP), R19
MOVD 8(RSP), R20
MOVD 16(RSP), R21
MOVD 24(RSP), R22
MOVD 32(RSP), R23
MOVD 40(RSP), R24
MOVD 48(RSP), R25
MOVD 56(RSP), R26
MOVD 64(RSP), R27
MOVD 72(RSP), g
FMOVD 80(RSP), F8
FMOVD 88(RSP), F9
FMOVD 96(RSP), F10
FMOVD 104(RSP), F11
FMOVD 112(RSP), F12
FMOVD 120(RSP), F13
FMOVD 128(RSP), F14
FMOVD 136(RSP), F15
ADD $144, RSP
// 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·pthread_attr_init_trampoline(SB),NOSPLIT,$0
MOVW $45, R0
BL libc_exit(SB)
MOVD 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_init(SB)
RET
TEXT runtime·pthread_attr_setstacksize_trampoline(SB),NOSPLIT,$0
MOVW $46, R0
BL libc_exit(SB)
MOVD 8(R0), R1 // arg 2 size
MOVD 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_setstacksize(SB)
RET
TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
MOVW $47, R0
BL libc_exit(SB)
MOVD 8(R0), R1 // arg 2 state
MOVD 0(R0), R0 // arg 1 attr
BL libc_pthread_attr_setdetachstate(SB)
RET
TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
MOVW $48, R0
BL libc_exit(SB)
SUB $16, RSP
MOVD 0(R0), R1 // arg 2 state
MOVD 8(R0), R2 // arg 3 start
MOVD 16(R0), R3 // arg 4 arg
MOVD RSP, R0 // arg 1 &threadid (which we throw away)
BL libc_pthread_create(SB)
ADD $16, RSP
RET
TEXT runtime·raise_trampoline(SB),NOSPLIT,$0