Adding upstream version 1.21.8.upstream/1.21.8

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

1 files changed, 652 insertions, 0 deletions

diff --git a/src/runtime/sys_openbsd_arm64.s b/src/runtime/sys_openbsd_arm64.s
new file mode 100644
index 0000000..6667dad
--- /dev/null
+++ b/src/runtime/sys_openbsd_arm64.s
@@ -0,0 +1,652 @@
+// Copyright 2019 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 arm64, 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_arm64.h"
+
+#define CLOCK_REALTIME	$0
+#define	CLOCK_MONOTONIC	$3
+
+// 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,$144
+	// R0 points to the m.
+	// We are already on m's g0 stack.
+
+	// Save callee-save registers.
+	SAVE_R19_TO_R28(8)
+	SAVE_F8_TO_F15(88)
+
+	MOVD    m_g0(R0), g
+	BL	runtime·save_g(SB)
+
+	BL	runtime·mstart(SB)
+
+	// Restore callee-save registers.
+	RESTORE_R19_TO_R28(8)
+	RESTORE_F8_TO_F15(88)
+
+	// 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|TOPFRAME,$192
+	// Save callee-save registers in the case of signal forwarding.
+	// Please refer to https://golang.org/issue/31827 .
+	SAVE_R19_TO_R28(8*4)
+	SAVE_F8_TO_F15(8*14)
+
+	// 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)
+
+	// Restore signum to R0.
+	MOVW	8(RSP), R0
+	// R1 and R2 already contain info and ctx, respectively.
+	BL	runtime·sigtrampgo<ABIInternal>(SB)
+
+	// Restore callee-save registers.
+	RESTORE_R19_TO_R28(8*4)
+	RESTORE_F8_TO_F15(8*14)
+
+	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·thrkill_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1		// arg 2 - signal
+	MOVD	$0, R2			// arg 3 - tcb
+	MOVW	0(R0), R0		// arg 1 - tid
+	CALL	libc_thrkill(SB)
+	RET
+
+TEXT runtime·thrsleep_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1		// arg 2 - clock_id
+	MOVD	16(R0), R2		// arg 3 - abstime
+	MOVD	24(R0), R3		// arg 4 - lock
+	MOVD	32(R0), R4		// arg 5 - abort
+	MOVD	0(R0), R0		// arg 1 - id
+	CALL	libc_thrsleep(SB)
+	RET
+
+TEXT runtime·thrwakeup_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1		// arg 2 - count
+	MOVD	0(R0), R0		// arg 1 - id
+	CALL	libc_thrwakeup(SB)
+	RET
+
+TEXT runtime·exit_trampoline(SB),NOSPLIT,$0
+	MOVW	0(R0), R0		// arg 1 - status
+	CALL	libc_exit(SB)
+	MOVD	$0, R0			// crash on failure
+	MOVD	R0, (R0)
+	RET
+
+TEXT runtime·getthrid_trampoline(SB),NOSPLIT,$0
+	MOVD	R0, R19			// pointer to args
+	CALL	libc_getthrid(SB)
+	MOVW	R0, 0(R19)		// return value
+	RET
+
+TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
+	MOVD	R0, R19			// pointer to args
+	CALL	libc_getpid(SB)		// arg 1 - pid
+	MOVW	0(R19), R1		// arg 2 - signal
+	CALL	libc_kill(SB)
+	RET
+
+TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$0
+	CALL	libc_sched_yield(SB)
+	RET
+
+TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
+	MOVD    R0, R19			// pointer to args
+	MOVD	0(R19), R0		// arg 1 - addr
+	MOVD	8(R19), R1		// arg 2 - len
+	MOVW	16(R19), R2		// arg 3 - prot
+	MOVW	20(R19), R3		// arg 4 - flags
+	MOVW	24(R19), R4		// arg 5 - fid
+	MOVW	28(R19), R5		// arg 6 - offset
+	CALL	libc_mmap(SB)
+	MOVD	$0, R1
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R1		// errno
+	MOVD	$0, R0
+noerr:
+	MOVD	R0, 32(R19)
+	MOVD	R1, 40(R19)
+	RET
+
+TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - len
+	MOVD	0(R0), R0		// arg 1 - addr
+	CALL	libc_munmap(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVD	$0, R0			// crash on failure
+	MOVD	R0, (R0)
+	RET
+
+TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0
+	MOVD	8(R0), R1		// arg 2 - len
+	MOVW	16(R0), R2		// arg 3 - advice
+	MOVD	0(R0), R0		// arg 1 - addr
+	CALL	libc_madvise(SB)
+	// ignore failure - maybe pages are locked
+	RET
+
+TEXT runtime·open_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1		// arg 2 - flags
+	MOVW	12(R0), R2		// arg 3 - mode
+	MOVD	0(R0), R0		// arg 1 - path
+	MOVD	$0, R3			// varargs
+	CALL	libc_open(SB)
+	RET
+
+TEXT runtime·close_trampoline(SB),NOSPLIT,$0
+	MOVD	0(R0), R0		// arg 1 - fd
+	CALL	libc_close(SB)
+	RET
+
+TEXT runtime·read_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - buf
+	MOVW	16(R0), R2		// arg 3 - count
+	MOVW	0(R0), R0		// arg 1 - fd
+	CALL	libc_read(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	NEG	R0, R0			// caller expects negative errno value
+noerr:
+	RET
+
+TEXT runtime·write_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - buf
+	MOVW	16(R0), R2		// arg 3 - count
+	MOVW	0(R0), R0		// arg 1 - fd
+	CALL	libc_write(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	NEG	R0, R0			// caller expects negative errno value
+noerr:
+	RET
+
+TEXT runtime·pipe2_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1		// arg 2 - flags
+	MOVD	0(R0), R0		// arg 1 - filedes
+	CALL	libc_pipe2(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	NEG	R0, R0			// caller expects negative errno value
+noerr:
+	RET
+
+TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - new
+	MOVD	16(R0), R2		// arg 3 - old
+	MOVW	0(R0), R0		// arg 1 - which
+	CALL	libc_setitimer(SB)
+	RET
+
+TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
+	MOVD	0(R0), R0		// arg 1 - usec
+	CALL	libc_usleep(SB)
+	RET
+
+TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1		// arg 2 - miblen
+	MOVD	16(R0), R2		// arg 3 - out
+	MOVD	24(R0), R3		// arg 4 - size
+	MOVD	32(R0), R4		// arg 5 - dst
+	MOVD	40(R0), R5		// arg 6 - ndst
+	MOVD	0(R0), R0		// arg 1 - mib
+	CALL	libc_sysctl(SB)
+	RET
+
+TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0
+	CALL	libc_kqueue(SB)
+	RET
+
+TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - keventt
+	MOVW	16(R0), R2		// arg 3 - nch
+	MOVD	24(R0), R3		// arg 4 - ev
+	MOVW	32(R0), R4		// arg 5 - nev
+	MOVD	40(R0), R5		// arg 6 - ts
+	MOVW	0(R0), R0		// arg 1 - kq
+	CALL	libc_kevent(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	NEG	R0, R0			// caller expects negative errno value
+noerr:
+	RET
+
+TEXT runtime·clock_gettime_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - tp
+	MOVD	0(R0), R0		// arg 1 - clock_id
+	CALL	libc_clock_gettime(SB)
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0		// errno
+	NEG	R0, R0			// caller expects negative errno value
+noerr:
+	RET
+
+TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
+	MOVD	R0, R19
+	MOVW	0(R19), R0		// arg 1 - fd
+	MOVW	4(R19), R1		// arg 2 - cmd
+	MOVW	8(R19), R2		// arg 3 - arg
+	MOVD	$0, R3			// vararg
+	CALL	libc_fcntl(SB)
+	MOVD	$0, R1
+	CMP	$-1, R0
+	BNE	noerr
+	CALL	libc_errno(SB)
+	MOVW	(R0), R1
+	MOVW	$-1, R0
+noerr:
+	MOVW	R0, 12(R19)
+	MOVW	R1, 16(R19)
+	RET
+
+TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - new
+	MOVD	16(R0), R2		// arg 3 - old
+	MOVW	0(R0), R0		// arg 1 - sig
+	CALL	libc_sigaction(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVD	$0, R0			// crash on syscall failure
+	MOVD	R0, (R0)
+	RET
+
+TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - new
+	MOVD	16(R0), R2		// arg 3 - old
+	MOVW	0(R0), R0		// arg 1 - how
+	CALL	libc_pthread_sigmask(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVD	$0, R0			// crash on syscall failure
+	MOVD	R0, (R0)
+	RET
+
+TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
+	MOVD	8(R0), R1		// arg 2 - old
+	MOVD	0(R0), R0		// arg 1 - new
+	CALL	libc_sigaltstack(SB)
+	CMP	$-1, R0
+	BNE	3(PC)
+	MOVD	$0, R0			// crash on syscall failure
+	MOVD	R0, (R0)
+	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
+	MOVD    R0, R19			// pointer to args
+
+	MOVD	(0*8)(R19), R11		// fn
+	MOVD	(1*8)(R19), R0		// a1
+	MOVD	(2*8)(R19), R1		// a2
+	MOVD	(3*8)(R19), R2		// a3
+	MOVD	$0, R3			// vararg
+
+	CALL	R11
+
+	MOVD	R0, (4*8)(R19)		// r1
+	MOVD	R1, (5*8)(R19)		// r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPW	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0
+	MOVD	R0, (6*8)(R19)		// err
+
+ok:
+	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
+	MOVD    R0, R19			// pointer to args
+
+	MOVD	(0*8)(R19), R11		// fn
+	MOVD	(1*8)(R19), R0		// a1
+	MOVD	(2*8)(R19), R1		// a2
+	MOVD	(3*8)(R19), R2		// a3
+	MOVD	$0, R3			// vararg
+
+	CALL	R11
+
+	MOVD	R0, (4*8)(R19)		// r1
+	MOVD	R1, (5*8)(R19)		// r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMP	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0
+	MOVD	R0, (6*8)(R19)		// err
+
+ok:
+	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
+	MOVD    R0, R19			// pointer to args
+
+	MOVD	(0*8)(R19), R11		// fn
+	MOVD	(1*8)(R19), R0		// a1
+	MOVD	(2*8)(R19), R1		// a2
+	MOVD	(3*8)(R19), R2		// a3
+	MOVD	(4*8)(R19), R3		// a4
+	MOVD	(5*8)(R19), R4		// a5
+	MOVD	(6*8)(R19), R5		// a6
+	MOVD	$0, R6			// vararg
+
+	CALL	R11
+
+	MOVD	R0, (7*8)(R19)		// r1
+	MOVD	R1, (8*8)(R19)		// r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPW	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0
+	MOVD	R0, (9*8)(R19)		// err
+
+ok:
+	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
+	MOVD    R0, R19			// pointer to args
+
+	MOVD	(0*8)(R19), R11		// fn
+	MOVD	(1*8)(R19), R0		// a1
+	MOVD	(2*8)(R19), R1		// a2
+	MOVD	(3*8)(R19), R2		// a3
+	MOVD	(4*8)(R19), R3		// a4
+	MOVD	(5*8)(R19), R4		// a5
+	MOVD	(6*8)(R19), R5		// a6
+	MOVD	$0, R6			// vararg
+
+	CALL	R11
+
+	MOVD	R0, (7*8)(R19)		// r1
+	MOVD	R1, (8*8)(R19)		// r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMP	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0
+	MOVD	R0, (9*8)(R19)		// err
+
+ok:
+	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
+	MOVD    R0, R19			// pointer to args
+
+	MOVD	(0*8)(R19), R11		// fn
+	MOVD	(1*8)(R19), R0		// a1
+	MOVD	(2*8)(R19), R1		// a2
+	MOVD	(3*8)(R19), R2		// a3
+	MOVD	(4*8)(R19), R3		// a4
+	MOVD	(5*8)(R19), R4		// a5
+	MOVD	(6*8)(R19), R5		// a6
+	MOVD	(7*8)(R19), R6		// a7
+	MOVD	(8*8)(R19), R7		// a8
+	MOVD	(9*8)(R19), R8		// a9
+	MOVD	(10*8)(R19), R9		// a10
+	MOVD	$0, R10			// vararg
+
+	CALL	R11
+
+	MOVD	R0, (11*8)(R19)		// r1
+	MOVD	R1, (12*8)(R19)		// r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMPW	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0
+	MOVD	R0, (13*8)(R19)		// err
+
+ok:
+	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
+	MOVD    R0, R19			// pointer to args
+
+	MOVD	(0*8)(R19), R11		// fn
+	MOVD	(1*8)(R19), R0		// a1
+	MOVD	(2*8)(R19), R1		// a2
+	MOVD	(3*8)(R19), R2		// a3
+	MOVD	(4*8)(R19), R3		// a4
+	MOVD	(5*8)(R19), R4		// a5
+	MOVD	(6*8)(R19), R5		// a6
+	MOVD	(7*8)(R19), R6		// a7
+	MOVD	(8*8)(R19), R7		// a8
+	MOVD	(9*8)(R19), R8		// a9
+	MOVD	(10*8)(R19), R9		// a10
+	MOVD	$0, R10			// vararg
+
+	CALL	R11
+
+	MOVD	R0, (11*8)(R19)		// r1
+	MOVD	R1, (12*8)(R19)		// r2
+
+	// Standard libc functions return -1 on error
+	// and set errno.
+	CMP	$-1, R0
+	BNE	ok
+
+	// Get error code from libc.
+	CALL	libc_errno(SB)
+	MOVW	(R0), R0
+	MOVD	R0, (13*8)(R19)		// err
+
+ok:
+	RET
+
+TEXT runtime·issetugid_trampoline(SB),NOSPLIT,$0
+	MOVD	R0, R19			// pointer to args
+	CALL	libc_issetugid(SB)
+	MOVW	R0, 0(R19)		// return value
+	RET