Adding upstream version 1.18.10.upstream/1.18.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 808 insertions, 0 deletions

diff --git a/src/runtime/sys_openbsd_arm.s b/src/runtime/sys_openbsd_arm.s
new file mode 100644
index 0000000..a9cb1fb
--- /dev/null
+++ b/src/runtime/sys_openbsd_arm.s
@@ -0,0 +1,808 @@
+// 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 ARM, OpenBSD
+// /usr/src/sys/kern/syscalls.master for syscall numbers.
+//
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "textflag.h"
+
+#define	CLOCK_REALTIME	$0
+#define	CLOCK_MONOTONIC	$3
+
+// With OpenBSD 6.7 onwards, an armv7 syscall returns two instructions
+// after the SWI instruction, to allow for a speculative execution
+// barrier to be placed after the SWI without impacting performance.
+// For now use hardware no-ops as this works with both older and newer
+// kernels. After OpenBSD 6.8 is released this should be changed to
+// speculation barriers.
+#define NOOP	MOVW    R0, R0
+#define	INVOKE_SYSCALL	\
+	SWI	$0;	\
+	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
+	CALL	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
+	CALL	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
+	CALL	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
+	CALL	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)
+	CALL	libc_pthread_create(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·thrkill_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 - signal
+	MOVW	$0, R2			// arg 3 - tcb
+	MOVW	0(R0), R0		// arg 1 - tid
+	CALL	libc_thrkill(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·thrsleep_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	SUB	$16, R13
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 - clock_id
+	MOVW	8(R0), R2		// arg 3 - abstime
+	MOVW	12(R0), R3		// arg 4 - lock
+	MOVW	16(R0), R4		// arg 5 - abort (on stack)
+	MOVW	R4, 0(R13)
+	MOVW	0(R0), R0		// arg 1 - id
+	CALL	libc_thrsleep(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·thrwakeup_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 - count
+	MOVW	0(R0), R0		// arg 1 - id
+	CALL	libc_thrwakeup(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·exit_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	0(R0), R0		// arg 1 exit status
+	BL	libc_exit(SB)
+	MOVW	$0, R8			// crash on failure
+	MOVW	R8, (R8)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·getthrid_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	MOVW	R0, R8
+	BIC     $0x7, R13		// align for ELF ABI
+	BL	libc_getthrid(SB)
+	MOVW	R0, 0(R8)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	R0, R4
+	BL	libc_getpid(SB)		// arg 1 pid
+	MOVW	R4, R1			// arg 2 signal
+	BL	libc_kill(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	BL	libc_sched_yield(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	SUB	$16, R13
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	R0, R8
+	MOVW	4(R0), R1		// arg 2 len
+	MOVW	8(R0), R2		// arg 3 prot
+	MOVW	12(R0), R3		// arg 4 flags
+	MOVW	16(R0), R4		// arg 5 fid (on stack)
+	MOVW	R4, 0(R13)
+	MOVW	$0, R5			// pad (on stack)
+	MOVW	R5, 4(R13)
+	MOVW	20(R0), R6		// arg 6 offset (on stack)
+	MOVW	R6, 8(R13)		// low 32 bits
+	MOVW    $0, R7
+	MOVW	R7, 12(R13)		// high 32 bits
+	MOVW	0(R0), R0		// arg 1 addr
+	BL	libc_mmap(SB)
+	MOVW	$0, R1
+	CMP	$-1, R0
+	BNE	ok
+	BL	libc_errno(SB)
+	MOVW	(R0), R1		// errno
+	MOVW	$0, R0
+ok:
+	MOVW	R0, 24(R8)
+	MOVW	R1, 28(R8)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 len
+	MOVW	0(R0), R0		// arg 1 addr
+	BL	libc_munmap(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVW	$0, R8			// crash on failure
+	MOVW	R8, (R8)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 len
+	MOVW	8(R0), R2		// arg 3 advice
+	MOVW	0(R0), R0		// arg 1 addr
+	BL	libc_madvise(SB)
+	// ignore failure - maybe pages are locked
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·open_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	SUB	$8, R13
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 - flags
+	MOVW	8(R0), R2		// arg 3 - mode (vararg, on stack)
+	MOVW	R2, 0(R13)
+	MOVW	0(R0), R0		// arg 1 - path
+	MOVW	R13, R4
+	BIC     $0x7, R13		// align for ELF ABI
+	BL	libc_open(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·close_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	0(R0), R0		// arg 1 - fd
+	BL	libc_close(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·read_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 - buf
+	MOVW	8(R0), R2		// arg 3 - count
+	MOVW	0(R0), R0		// arg 1 - fd
+	BL	libc_read(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	BL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	RSB.CS	$0, R0			// caller expects negative errno
+noerr:
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·write_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 buf
+	MOVW	8(R0), R2		// arg 3 count
+	MOVW	0(R0), R0		// arg 1 fd
+	BL	libc_write(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	BL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	RSB.CS	$0, R0			// caller expects negative errno
+noerr:
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·pipe2_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 flags
+	MOVW	0(R0), R0		// arg 1 filedes
+	BL	libc_pipe2(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	BL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	RSB.CS	$0, R0			// caller expects negative errno
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 new
+	MOVW	8(R0), R2		// arg 3 old
+	MOVW	0(R0), R0		// arg 1 which
+	BL	libc_setitimer(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	0(R0), R0		// arg 1 usec
+	BL	libc_usleep(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	SUB	$8, R13
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 miblen
+	MOVW	8(R0), R2		// arg 3 out
+	MOVW	12(R0), R3		// arg 4 size
+	MOVW	16(R0), R4		// arg 5 dst (on stack)
+	MOVW	R4, 0(R13)
+	MOVW	20(R0), R5		// arg 6 ndst (on stack)
+	MOVW	R5, 4(R13)
+	MOVW	0(R0), R0		// arg 1 mib
+	BL	libc_sysctl(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	BL	libc_kqueue(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	SUB	$8, R13
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 keventt
+	MOVW	8(R0), R2		// arg 3 nch
+	MOVW	12(R0), R3		// arg 4 ev
+	MOVW	16(R0), R4		// arg 5 nev (on stack)
+	MOVW	R4, 0(R13)
+	MOVW	20(R0), R5		// arg 6 ts (on stack)
+	MOVW	R5, 4(R13)
+	MOVW	0(R0), R0		// arg 1 kq
+	BL	libc_kevent(SB)
+	CMP	$-1, R0
+	BNE	ok
+	BL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	RSB.CS	$0, R0			// caller expects negative errno
+ok:
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·clock_gettime_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 tp
+	MOVW	0(R0), R0		// arg 1 clock_id
+	BL	libc_clock_gettime(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	BL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	RSB.CS	$0, R0			// caller expects negative errno
+noerr:
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	SUB	$8, R13
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 cmd
+	MOVW	8(R0), R2		// arg 3 arg (vararg, on stack)
+	MOVW	R2, 0(R13)
+	MOVW	0(R0), R0		// arg 1 fd
+	BL	libc_fcntl(SB)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 new
+	MOVW	8(R0), R2		// arg 3 old
+	MOVW	0(R0), R0		// arg 1 sig
+	BL	libc_sigaction(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVW	$0, R8			// crash on failure
+	MOVW	R8, (R8)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 new
+	MOVW	8(R0), R2		// arg 3 old
+	MOVW	0(R0), R0		// arg 1 how
+	BL	libc_pthread_sigmask(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVW	$0, R8			// crash on failure
+	MOVW	R8, (R8)
+	MOVW	R9, R13
+	RET
+
+TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+	MOVW	4(R0), R1		// arg 2 old
+	MOVW	0(R0), R0		// arg 1 new
+	BL	libc_sigaltstack(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVW	$0, R8			// crash on failure
+	MOVW	R8, (R8)
+	MOVW	R9, R13
+	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
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+
+	MOVW	R0, R8
+
+	MOVW	(0*4)(R8), R7 // fn
+	MOVW	(1*4)(R8), R0 // a1
+	MOVW	(2*4)(R8), R1 // a2
+	MOVW	(3*4)(R8), R2 // a3
+
+	BL	(R7)
+
+	MOVW	R0, (4*4)(R8) // r1
+	MOVW	R1, (5*4)(R8) // r2
+
+	// Standard libc functions return -1 on error and set errno.
+	CMP	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	BL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	R1, (6*4)(R8) // err
+
+ok:
+	MOVW	$0, R0		// no error (it's ignored anyway)
+	MOVW	R9, R13
+	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
+	MOVW	R13, R9
+	BIC     $0x7, R13		// align for ELF ABI
+
+	MOVW	R0, R8
+
+	MOVW	(0*4)(R8), R7 // fn
+	MOVW	(1*4)(R8), R0 // a1
+	MOVW	(2*4)(R8), R1 // a2
+	MOVW	(3*4)(R8), R2 // a3
+
+	BL	(R7)
+
+	MOVW	R0, (4*4)(R8) // r1
+	MOVW	R1, (5*4)(R8) // r2
+
+	// Standard libc functions return -1 on error and set errno.
+	CMP	$-1, R0
+	BNE	ok
+	CMP	$-1, R1
+	BNE	ok
+
+	// Get error code from libc.
+	BL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	R1, (6*4)(R8) // err
+
+ok:
+	MOVW	$0, R0		// no error (it's ignored anyway)
+	MOVW	R9, R13
+	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
+	MOVW	R13, R9
+	SUB	$8, R13
+	BIC     $0x7, R13		// align for ELF ABI
+
+	MOVW	R0, R8
+
+	MOVW	(0*4)(R8), R7 // fn
+	MOVW	(1*4)(R8), R0 // a1
+	MOVW	(2*4)(R8), R1 // a2
+	MOVW	(3*4)(R8), R2 // a3
+	MOVW	(4*4)(R8), R3 // a4
+	MOVW	(5*4)(R8), R4 // a5
+	MOVW	R4, 0(R13)
+	MOVW	(6*4)(R8), R5 // a6
+	MOVW	R5, 4(R13)
+
+	BL	(R7)
+
+	MOVW	R0, (7*4)(R8) // r1
+	MOVW	R1, (8*4)(R8) // r2
+
+	// Standard libc functions return -1 on error and set errno.
+	CMP	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	BL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	R1, (9*4)(R8) // err
+
+ok:
+	MOVW	$0, R0		// no error (it's ignored anyway)
+	MOVW	R9, R13
+	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
+	MOVW	R13, R9
+	SUB	$8, R13
+	BIC     $0x7, R13		// align for ELF ABI
+
+	MOVW	R0, R8
+
+	MOVW	(0*4)(R8), R7 // fn
+	MOVW	(1*4)(R8), R0 // a1
+	MOVW	(2*4)(R8), R1 // a2
+	MOVW	(3*4)(R8), R2 // a3
+	MOVW	(4*4)(R8), R3 // a4
+	MOVW	(5*4)(R8), R4 // a5
+	MOVW	R4, 0(R13)
+	MOVW	(6*4)(R8), R5 // a6
+	MOVW	R5, 4(R13)
+
+	BL	(R7)
+
+	MOVW	R0, (7*4)(R8) // r1
+	MOVW	R1, (8*4)(R8) // r2
+
+	// Standard libc functions return -1 on error and set errno.
+	CMP	$-1, R0
+	BNE	ok
+	CMP	$-1, R1
+	BNE	ok
+
+	// Get error code from libc.
+	BL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	R1, (9*4)(R8) // err
+
+ok:
+	MOVW	$0, R0		// no error (it's ignored anyway)
+	MOVW	R9, R13
+	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
+	MOVW	R13, R9
+	SUB	$24, R13
+	BIC     $0x7, R13		// align for ELF ABI
+
+	MOVW	R0, R8
+
+	MOVW	(0*4)(R8), R7 // fn
+	MOVW	(1*4)(R8), R0 // a1
+	MOVW	(2*4)(R8), R1 // a2
+	MOVW	(3*4)(R8), R2 // a3
+	MOVW	(4*4)(R8), R3 // a4
+	MOVW	(5*4)(R8), R4 // a5
+	MOVW	R4, 0(R13)
+	MOVW	(6*4)(R8), R5 // a6
+	MOVW	R5, 4(R13)
+	MOVW	(7*4)(R8), R6 // a7
+	MOVW	R6, 8(R13)
+	MOVW	(8*4)(R8), R4 // a8
+	MOVW	R4, 12(R13)
+	MOVW	(9*4)(R8), R5 // a9
+	MOVW	R5, 16(R13)
+	MOVW	(10*4)(R8), R6 // a10
+	MOVW	R6, 20(R13)
+
+	BL	(R7)
+
+	MOVW	R0, (11*4)(R8) // r1
+	MOVW	R1, (12*4)(R8) // r2
+
+	// Standard libc functions return -1 on error and set errno.
+	CMP	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	BL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	R1, (13*4)(R8) // err
+
+ok:
+	MOVW	$0, R0		// no error (it's ignored anyway)
+	MOVW	R9, R13
+	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
+	MOVW	R13, R9
+	SUB	$24, R13
+	BIC     $0x7, R13		// align for ELF ABI
+
+	MOVW	R0, R8
+
+	MOVW	(0*4)(R8), R7 // fn
+	MOVW	(1*4)(R8), R0 // a1
+	MOVW	(2*4)(R8), R1 // a2
+	MOVW	(3*4)(R8), R2 // a3
+	MOVW	(4*4)(R8), R3 // a4
+	MOVW	(5*4)(R8), R4 // a5
+	MOVW	R4, 0(R13)
+	MOVW	(6*4)(R8), R5 // a6
+	MOVW	R5, 4(R13)
+	MOVW	(7*4)(R8), R6 // a7
+	MOVW	R6, 8(R13)
+	MOVW	(8*4)(R8), R4 // a8
+	MOVW	R4, 12(R13)
+	MOVW	(9*4)(R8), R5 // a9
+	MOVW	R5, 16(R13)
+	MOVW	(10*4)(R8), R6 // a10
+	MOVW	R6, 20(R13)
+
+	BL	(R7)
+
+	MOVW	R0, (11*4)(R8) // r1
+	MOVW	R1, (12*4)(R8) // r2
+
+	// Standard libc functions return -1 on error and set errno.
+	CMP	$-1, R0
+	BNE	ok
+	CMP	$-1, R1
+	BNE	ok
+
+	// Get error code from libc.
+	BL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	R1, (13*4)(R8) // err
+
+ok:
+	MOVW	$0, R0		// no error (it's ignored anyway)
+	MOVW	R9, R13
+	RET