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rt0_openbsd_arm64.s
// 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" #include "cgo/abi_arm64.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. SAVE_R19_TO_R28(24) SAVE_F8_TO_F15(104) // 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. RESTORE_R19_TO_R28(24) RESTORE_F8_TO_F15(104) 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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