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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.
#include "textflag.h"
// See comment in runtime/sys_openbsd_arm64.s re this construction.
#define INVOKE_SYSCALL \
SVC; \
NOOP; \
NOOP
TEXT _rt0_arm64_openbsd(SB),NOSPLIT|NOFRAME,$0
MOVD 0(RSP), R0 // argc
ADD $8, RSP, R1 // argv
BL main(SB)
// When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
TEXT _rt0_arm64_openbsd_lib(SB),NOSPLIT,$184
// Preserve callee-save registers.
MOVD R19, 24(RSP)
MOVD R20, 32(RSP)
MOVD R21, 40(RSP)
MOVD R22, 48(RSP)
MOVD R23, 56(RSP)
MOVD R24, 64(RSP)
MOVD R25, 72(RSP)
MOVD R26, 80(RSP)
MOVD R27, 88(RSP)
FMOVD F8, 96(RSP)
FMOVD F9, 104(RSP)
FMOVD F10, 112(RSP)
FMOVD F11, 120(RSP)
FMOVD F12, 128(RSP)
FMOVD F13, 136(RSP)
FMOVD F14, 144(RSP)
FMOVD F15, 152(RSP)
MOVD g, 160(RSP)
// Initialize g as null in case of using g later e.g. sigaction in cgo_sigaction.go
MOVD ZR, g
MOVD R0, _rt0_arm64_openbsd_lib_argc<>(SB)
MOVD R1, _rt0_arm64_openbsd_lib_argv<>(SB)
// Synchronous initialization.
MOVD $runtime·libpreinit(SB), R4
BL (R4)
// Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R4
CBZ R4, nocgo
MOVD $_rt0_arm64_openbsd_lib_go(SB), R0
MOVD $0, R1
SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved.
BL (R4)
ADD $16, RSP
B restore
nocgo:
MOVD $0x800000, R0 // stacksize = 8192KB
MOVD $_rt0_arm64_openbsd_lib_go(SB), R1
MOVD R0, 8(RSP)
MOVD R1, 16(RSP)
MOVD $runtime·newosproc0(SB),R4
BL (R4)
restore:
// Restore callee-save registers.
MOVD 24(RSP), R19
MOVD 32(RSP), R20
MOVD 40(RSP), R21
MOVD 48(RSP), R22
MOVD 56(RSP), R23
MOVD 64(RSP), R24
MOVD 72(RSP), R25
MOVD 80(RSP), R26
MOVD 88(RSP), R27
FMOVD 96(RSP), F8
FMOVD 104(RSP), F9
FMOVD 112(RSP), F10
FMOVD 120(RSP), F11
FMOVD 128(RSP), F12
FMOVD 136(RSP), F13
FMOVD 144(RSP), F14
FMOVD 152(RSP), F15
MOVD 160(RSP), g
RET
TEXT _rt0_arm64_openbsd_lib_go(SB),NOSPLIT,$0
MOVD _rt0_arm64_openbsd_lib_argc<>(SB), R0
MOVD _rt0_arm64_openbsd_lib_argv<>(SB), R1
MOVD $runtime·rt0_go(SB),R4
B (R4)
DATA _rt0_arm64_openbsd_lib_argc<>(SB)/8, $0
GLOBL _rt0_arm64_openbsd_lib_argc<>(SB),NOPTR, $8
DATA _rt0_arm64_openbsd_lib_argv<>(SB)/8, $0
GLOBL _rt0_arm64_openbsd_lib_argv<>(SB),NOPTR, $8
TEXT main(SB),NOSPLIT|NOFRAME,$0
MOVD $runtime·rt0_go(SB), R2
BL (R2)
exit:
MOVD $0, R0
MOVD $1, R8 // sys_exit
INVOKE_SYSCALL
B exit
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