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+// 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)
+
+#ifdef GOEXPERIMENT_regabiargs
+ // Restore signum to R0.
+ MOVW 8(RSP), R0
+ // R1 and R2 already contain info and ctx, respectively.
+#else
+ MOVD R1, 16(RSP)
+ MOVD R2, 24(RSP)
+#endif
+ 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
+ MOVW 4(R0), R1 // arg 2 - cmd
+ MOVW 8(R0), R2 // arg 3 - arg
+ MOVW 0(R0), R0 // arg 1 - fd
+ MOVD $0, R3 // vararg
+ CALL libc_fcntl(SB)
+ 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
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