1 files changed, 776 insertions, 0 deletions
diff --git a/src/runtime/sys_openbsd_amd64.s b/src/runtime/sys_openbsd_amd64.s
new file mode 100644
index 0000000..2c026c8
--- /dev/null
+++ b/src/runtime/sys_openbsd_amd64.s
@@ -0,0 +1,776 @@
+// Copyright 2009 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.
+//
+// System calls and other sys.stuff for AMD64, OpenBSD.
+// 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"
+#include "go_tls.h"
+#include "textflag.h"
+#include "cgo/abi_amd64.h"
+
+#define CLOCK_MONOTONIC	$3
+
+TEXT runtime·settls(SB),NOSPLIT,$0
+	// Nothing to do, pthread already set thread-local storage up.
+	RET
+
+// 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
+	// DI points to the m.
+	// We are already on m's g0 stack.
+
+	// Transition from C ABI to Go ABI.
+	PUSH_REGS_HOST_TO_ABI0()
+
+	// Load g and save to TLS entry.
+	// See cmd/link/internal/ld/sym.go:computeTLSOffset.
+	MOVQ	m_g0(DI), DX // g
+	MOVQ	DX, -8(FS)
+
+	CALL	runtime·mstart(SB)
+
+	POP_REGS_HOST_TO_ABI0()
+
+	// 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).
+	XORL	AX, AX
+	RET
+
+TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
+	MOVQ	fn+0(FP),    AX
+	MOVL	sig+8(FP),   DI
+	MOVQ	info+16(FP), SI
+	MOVQ	ctx+24(FP),  DX
+	PUSHQ	BP
+	MOVQ	SP, BP
+	ANDQ	$~15, SP     // alignment for x86_64 ABI
+	CALL	AX
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// Called using C ABI.
+TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0
+	// Transition from C ABI to Go ABI.
+	PUSH_REGS_HOST_TO_ABI0()
+
+	// Set up ABIInternal environment: g in R14, cleared X15.
+	get_tls(R12)
+	MOVQ	g(R12), R14
+	PXOR	X15, X15
+
+	// Reserve space for spill slots.
+	NOP	SP		// disable vet stack checking
+	ADJSP   $24
+
+	// Call into the Go signal handler
+	MOVQ	DI, AX	// sig
+	MOVQ	SI, BX	// info
+	MOVQ	DX, CX	// ctx
+	CALL	·sigtrampgo<ABIInternal>(SB)
+
+	ADJSP	$-24
+
+	POP_REGS_HOST_TO_ABI0()
+	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 DI.
+// A single int32 result is returned in AX.
+// (For more results, make an args/results structure.)
+TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	0(DI), DI		// arg 1 - attr
+	CALL	libc_pthread_attr_init(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·pthread_attr_destroy_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	0(DI), DI		// arg 1 - attr
+	CALL	libc_pthread_attr_destroy(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 - stacksize
+	MOVQ	0(DI), DI		// arg 1 - attr
+	CALL	libc_pthread_attr_getstacksize(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 - detachstate
+	MOVQ	0(DI), DI		// arg 1 - attr
+	CALL	libc_pthread_attr_setdetachstate(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	0(DI), SI		// arg 2 - attr
+	MOVQ	8(DI), DX		// arg 3 - start
+	MOVQ	16(DI), CX		// arg 4 - arg
+	MOVQ	SP, DI			// arg 1 - &thread (discarded)
+	CALL	libc_pthread_create(SB)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+TEXT runtime·thrkill_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	8(DI), SI		// arg 2 - signal
+	MOVQ	$0, DX			// arg 3 - tcb
+	MOVL	0(DI), DI		// arg 1 - tid
+	CALL	libc_thrkill(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·thrsleep_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	8(DI), SI		// arg 2 - clock_id
+	MOVQ	16(DI), DX		// arg 3 - abstime
+	MOVQ	24(DI), CX		// arg 4 - lock
+	MOVQ	32(DI), R8		// arg 5 - abort
+	MOVQ	0(DI), DI		// arg 1 - id
+	CALL	libc_thrsleep(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·thrwakeup_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	8(DI), SI		// arg 2 - count
+	MOVQ	0(DI), DI		// arg 1 - id
+	CALL	libc_thrwakeup(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·exit_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	0(DI), DI		// arg 1 exit status
+	CALL	libc_exit(SB)
+	MOVL	$0xf1, 0xf1  // crash
+	POPQ	BP
+	RET
+
+TEXT runtime·getthrid_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	DI, BX			// BX is caller-save
+	CALL	libc_getthrid(SB)
+	MOVL	AX, 0(BX)		// return value
+	POPQ	BP
+	RET
+
+TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	0(DI), BX	// signal
+	CALL	libc_getpid(SB)
+	MOVL	AX, DI		// arg 1 pid
+	MOVL	BX, SI		// arg 2 signal
+	CALL	libc_kill(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	CALL	libc_sched_yield(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP			// make a frame; keep stack aligned
+	MOVQ	SP, BP
+	MOVQ	DI, BX
+	MOVQ	0(BX), DI		// arg 1 addr
+	MOVQ	8(BX), SI		// arg 2 len
+	MOVL	16(BX), DX		// arg 3 prot
+	MOVL	20(BX), CX		// arg 4 flags
+	MOVL	24(BX), R8		// arg 5 fid
+	MOVL	28(BX), R9		// arg 6 offset
+	CALL	libc_mmap(SB)
+	XORL	DX, DX
+	CMPQ	AX, $-1
+	JNE	ok
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), DX		// errno
+	XORQ	AX, AX
+ok:
+	MOVQ	AX, 32(BX)
+	MOVQ	DX, 40(BX)
+	POPQ	BP
+	RET
+
+TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 len
+	MOVQ	0(DI), DI		// arg 1 addr
+	CALL	libc_munmap(SB)
+	TESTQ	AX, AX
+	JEQ	2(PC)
+	MOVL	$0xf1, 0xf1  // crash
+	POPQ	BP
+	RET
+
+TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI	// arg 2 len
+	MOVL	16(DI), DX	// arg 3 advice
+	MOVQ	0(DI), DI	// arg 1 addr
+	CALL	libc_madvise(SB)
+	// ignore failure - maybe pages are locked
+	POPQ	BP
+	RET
+
+TEXT runtime·open_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	8(DI), SI		// arg 2 - flags
+	MOVL	12(DI), DX		// arg 3 - mode
+	MOVQ	0(DI), DI		// arg 1 - path
+	XORL	AX, AX			// vararg: say "no float args"
+	CALL	libc_open(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·close_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	0(DI), DI		// arg 1 - fd
+	CALL	libc_close(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·read_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 - buf
+	MOVL	16(DI), DX		// arg 3 - count
+	MOVL	0(DI), DI		// arg 1 - fd
+	CALL	libc_read(SB)
+	TESTL	AX, AX
+	JGE	noerr
+	CALL	libc_errno(SB)
+	MOVL	(AX), AX		// errno
+	NEGL	AX			// caller expects negative errno value
+noerr:
+	POPQ	BP
+	RET
+
+TEXT runtime·write_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 buf
+	MOVL	16(DI), DX		// arg 3 count
+	MOVL	0(DI), DI		// arg 1 fd
+	CALL	libc_write(SB)
+	TESTL	AX, AX
+	JGE	noerr
+	CALL	libc_errno(SB)
+	MOVL	(AX), AX		// errno
+	NEGL	AX			// caller expects negative errno value
+noerr:
+	POPQ	BP
+	RET
+
+TEXT runtime·pipe2_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	8(DI), SI		// arg 2 flags
+	MOVQ	0(DI), DI		// arg 1 filedes
+	CALL	libc_pipe2(SB)
+	TESTL	AX, AX
+	JEQ	3(PC)
+	CALL	libc_errno(SB)
+	MOVL	(AX), AX		// errno
+	NEGL	AX			// caller expects negative errno value
+	POPQ	BP
+	RET
+
+TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 new
+	MOVQ	16(DI), DX		// arg 3 old
+	MOVL	0(DI), DI		// arg 1 which
+	CALL	libc_setitimer(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	0(DI), DI		// arg 1 usec
+	CALL	libc_usleep(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	8(DI), SI		// arg 2 miblen
+	MOVQ	16(DI), DX		// arg 3 out
+	MOVQ	24(DI), CX		// arg 4 size
+	MOVQ	32(DI), R8		// arg 5 dst
+	MOVQ	40(DI), R9		// arg 6 ndst
+	MOVQ	0(DI), DI		// arg 1 mib
+	CALL	libc_sysctl(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	CALL	libc_kqueue(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 keventt
+	MOVL	16(DI), DX		// arg 3 nch
+	MOVQ	24(DI), CX		// arg 4 ev
+	MOVL	32(DI), R8		// arg 5 nev
+	MOVQ	40(DI), R9		// arg 6 ts
+	MOVL	0(DI), DI		// arg 1 kq
+	CALL	libc_kevent(SB)
+	CMPL	AX, $-1
+	JNE	ok
+	CALL	libc_errno(SB)
+	MOVL	(AX), AX		// errno
+	NEGL	AX			// caller expects negative errno value
+ok:
+	POPQ	BP
+	RET
+
+TEXT runtime·clock_gettime_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP			// make a frame; keep stack aligned
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 tp
+	MOVL	0(DI), DI		// arg 1 clock_id
+	CALL	libc_clock_gettime(SB)
+	TESTL	AX, AX
+	JEQ	noerr
+	CALL	libc_errno(SB)
+	MOVL	(AX), AX		// errno
+	NEGL	AX			// caller expects negative errno value
+noerr:
+	POPQ	BP
+	RET
+
+TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVL	4(DI), SI		// arg 2 cmd
+	MOVL	8(DI), DX		// arg 3 arg
+	MOVL	0(DI), DI		// arg 1 fd
+	XORL	AX, AX			// vararg: say "no float args"
+	CALL	libc_fcntl(SB)
+	POPQ	BP
+	RET
+
+TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 new
+	MOVQ	16(DI), DX		// arg 3 old
+	MOVL	0(DI), DI		// arg 1 sig
+	CALL	libc_sigaction(SB)
+	TESTL	AX, AX
+	JEQ	2(PC)
+	MOVL	$0xf1, 0xf1  // crash
+	POPQ	BP
+	RET
+
+TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI	// arg 2 new
+	MOVQ	16(DI), DX	// arg 3 old
+	MOVL	0(DI), DI	// arg 1 how
+	CALL	libc_pthread_sigmask(SB)
+	TESTL	AX, AX
+	JEQ	2(PC)
+	MOVL	$0xf1, 0xf1  // crash
+	POPQ	BP
+	RET
+
+TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	MOVQ	8(DI), SI		// arg 2 old
+	MOVQ	0(DI), DI		// arg 1 new
+	CALL	libc_sigaltstack(SB)
+	TESTQ	AX, AX
+	JEQ	2(PC)
+	MOVL	$0xf1, 0xf1  // crash
+	POPQ	BP
+	RET
+
+// syscall calls a function in libc on behalf of the syscall package.
+// syscall takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall must be called on the g0 stack with the
+// C calling convention (use libcCall).
+//
+// syscall expects a 32-bit result and tests for 32-bit -1
+// to decide there was an error.
+TEXT runtime·syscall(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), CX // fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	CX
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (4*8)(DI) // r1
+	MOVQ	DX, (5*8)(DI) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPL	AX, $-1	      // Note: high 32 bits are junk
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (6*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscallX calls a function in libc on behalf of the syscall package.
+// syscallX takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscallX must be called on the g0 stack with the
+// C calling convention (use libcCall).
+//
+// syscallX is like syscall but expects a 64-bit result
+// and tests for 64-bit -1 to decide there was an error.
+TEXT runtime·syscallX(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), CX // fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	CX
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (4*8)(DI) // r1
+	MOVQ	DX, (5*8)(DI) // r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPQ	AX, $-1
+	JNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (6*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscall6 calls a function in libc on behalf of the syscall package.
+// syscall6 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+//
+// syscall6 expects a 32-bit result and tests for 32-bit -1
+// to decide there was an error.
+TEXT runtime·syscall6(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), R11// fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	(4*8)(DI), CX // a4
+	MOVQ	(5*8)(DI), R8 // a5
+	MOVQ	(6*8)(DI), R9 // a6
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	R11
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (7*8)(DI) // r1
+	MOVQ	DX, (8*8)(DI) // r2
+
+	CMPL	AX, $-1
+	JNE	ok
+
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (9*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscall6X calls a function in libc on behalf of the syscall package.
+// syscall6X takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall6X must be called on the g0 stack with the
+// C calling convention (use libcCall).
+//
+// syscall6X is like syscall6 but expects a 64-bit result
+// and tests for 64-bit -1 to decide there was an error.
+TEXT runtime·syscall6X(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ	$16, SP
+	MOVQ	(0*8)(DI), R11// fn
+	MOVQ	(2*8)(DI), SI // a2
+	MOVQ	(3*8)(DI), DX // a3
+	MOVQ	(4*8)(DI), CX // a4
+	MOVQ	(5*8)(DI), R8 // a5
+	MOVQ	(6*8)(DI), R9 // a6
+	MOVQ	DI, (SP)
+	MOVQ	(1*8)(DI), DI // a1
+	XORL	AX, AX	      // vararg: say "no float args"
+
+	CALL	R11
+
+	MOVQ	(SP), DI
+	MOVQ	AX, (7*8)(DI) // r1
+	MOVQ	DX, (8*8)(DI) // r2
+
+	CMPQ	AX, $-1
+	JNE	ok
+
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(SP), DI
+	MOVQ	AX, (9*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscall10 calls a function in libc on behalf of the syscall package.
+// syscall10 takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	a7    uintptr
+//	a8    uintptr
+//	a9    uintptr
+//	a10   uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall10 must be called on the g0 stack with the
+// C calling convention (use libcCall).
+TEXT runtime·syscall10(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ    $48, SP
+
+	// Arguments a1 to a6 get passed in registers, with a7 onwards being
+	// passed via the stack per the x86-64 System V ABI
+	// (https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf).
+	MOVQ	(7*8)(DI), R10	// a7
+	MOVQ	(8*8)(DI), R11	// a8
+	MOVQ	(9*8)(DI), R12	// a9
+	MOVQ	(10*8)(DI), R13	// a10
+	MOVQ	R10, (0*8)(SP)	// a7
+	MOVQ	R11, (1*8)(SP)	// a8
+	MOVQ	R12, (2*8)(SP)	// a9
+	MOVQ	R13, (3*8)(SP)	// a10
+	MOVQ	(0*8)(DI), R11	// fn
+	MOVQ	(2*8)(DI), SI	// a2
+	MOVQ	(3*8)(DI), DX	// a3
+	MOVQ	(4*8)(DI), CX	// a4
+	MOVQ	(5*8)(DI), R8	// a5
+	MOVQ	(6*8)(DI), R9	// a6
+	MOVQ	DI, (4*8)(SP)
+	MOVQ	(1*8)(DI), DI	// a1
+	XORL	AX, AX	     	// vararg: say "no float args"
+
+	CALL	R11
+
+	MOVQ	(4*8)(SP), DI
+	MOVQ	AX, (11*8)(DI) // r1
+	MOVQ	DX, (12*8)(DI) // r2
+
+	CMPL	AX, $-1
+	JNE	ok
+
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(4*8)(SP), DI
+	MOVQ	AX, (13*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET
+
+// syscall10X calls a function in libc on behalf of the syscall package.
+// syscall10X takes a pointer to a struct like:
+// struct {
+//	fn    uintptr
+//	a1    uintptr
+//	a2    uintptr
+//	a3    uintptr
+//	a4    uintptr
+//	a5    uintptr
+//	a6    uintptr
+//	a7    uintptr
+//	a8    uintptr
+//	a9    uintptr
+//	a10   uintptr
+//	r1    uintptr
+//	r2    uintptr
+//	err   uintptr
+// }
+// syscall10X must be called on the g0 stack with the
+// C calling convention (use libcCall).
+//
+// syscall10X is like syscall10 but expects a 64-bit result
+// and tests for 64-bit -1 to decide there was an error.
+TEXT runtime·syscall10X(SB),NOSPLIT,$0
+	PUSHQ	BP
+	MOVQ	SP, BP
+	SUBQ    $48, SP
+
+	// Arguments a1 to a6 get passed in registers, with a7 onwards being
+	// passed via the stack per the x86-64 System V ABI
+	// (https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf).
+	MOVQ	(7*8)(DI), R10	// a7
+	MOVQ	(8*8)(DI), R11	// a8
+	MOVQ	(9*8)(DI), R12	// a9
+	MOVQ	(10*8)(DI), R13	// a10
+	MOVQ	R10, (0*8)(SP)	// a7
+	MOVQ	R11, (1*8)(SP)	// a8
+	MOVQ	R12, (2*8)(SP)	// a9
+	MOVQ	R13, (3*8)(SP)	// a10
+	MOVQ	(0*8)(DI), R11	// fn
+	MOVQ	(2*8)(DI), SI	// a2
+	MOVQ	(3*8)(DI), DX	// a3
+	MOVQ	(4*8)(DI), CX	// a4
+	MOVQ	(5*8)(DI), R8	// a5
+	MOVQ	(6*8)(DI), R9	// a6
+	MOVQ	DI, (4*8)(SP)
+	MOVQ	(1*8)(DI), DI	// a1
+	XORL	AX, AX	     	// vararg: say "no float args"
+
+	CALL	R11
+
+	MOVQ	(4*8)(SP), DI
+	MOVQ	AX, (11*8)(DI) // r1
+	MOVQ	DX, (12*8)(DI) // r2
+
+	CMPQ	AX, $-1
+	JNE	ok
+
+	CALL	libc_errno(SB)
+	MOVLQSX	(AX), AX
+	MOVQ	(4*8)(SP), DI
+	MOVQ	AX, (13*8)(DI) // err
+
+ok:
+	XORL	AX, AX        // no error (it's ignored anyway)
+	MOVQ	BP, SP
+	POPQ	BP
+	RET