github.com/AESNooper/go/src@v0.0.0-20220218095104-b56a4ab1bbbb/runtime/rt0_openbsd_arm64.s (about) 1 // Copyright 2019 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "textflag.h" 6 7 // See comment in runtime/sys_openbsd_arm64.s re this construction. 8 #define INVOKE_SYSCALL \ 9 SVC; \ 10 NOOP; \ 11 NOOP 12 13 TEXT _rt0_arm64_openbsd(SB),NOSPLIT|NOFRAME,$0 14 MOVD 0(RSP), R0 // argc 15 ADD $8, RSP, R1 // argv 16 BL main(SB) 17 18 // When building with -buildmode=c-shared, this symbol is called when the shared 19 // library is loaded. 20 TEXT _rt0_arm64_openbsd_lib(SB),NOSPLIT,$184 21 // Preserve callee-save registers. 22 MOVD R19, 24(RSP) 23 MOVD R20, 32(RSP) 24 MOVD R21, 40(RSP) 25 MOVD R22, 48(RSP) 26 MOVD R23, 56(RSP) 27 MOVD R24, 64(RSP) 28 MOVD R25, 72(RSP) 29 MOVD R26, 80(RSP) 30 MOVD R27, 88(RSP) 31 FMOVD F8, 96(RSP) 32 FMOVD F9, 104(RSP) 33 FMOVD F10, 112(RSP) 34 FMOVD F11, 120(RSP) 35 FMOVD F12, 128(RSP) 36 FMOVD F13, 136(RSP) 37 FMOVD F14, 144(RSP) 38 FMOVD F15, 152(RSP) 39 MOVD g, 160(RSP) 40 41 // Initialize g as null in case of using g later e.g. sigaction in cgo_sigaction.go 42 MOVD ZR, g 43 44 MOVD R0, _rt0_arm64_openbsd_lib_argc<>(SB) 45 MOVD R1, _rt0_arm64_openbsd_lib_argv<>(SB) 46 47 // Synchronous initialization. 48 MOVD $runtime·libpreinit(SB), R4 49 BL (R4) 50 51 // Create a new thread to do the runtime initialization and return. 52 MOVD _cgo_sys_thread_create(SB), R4 53 CBZ R4, nocgo 54 MOVD $_rt0_arm64_openbsd_lib_go(SB), R0 55 MOVD $0, R1 56 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. 57 BL (R4) 58 ADD $16, RSP 59 B restore 60 61 nocgo: 62 MOVD $0x800000, R0 // stacksize = 8192KB 63 MOVD $_rt0_arm64_openbsd_lib_go(SB), R1 64 MOVD R0, 8(RSP) 65 MOVD R1, 16(RSP) 66 MOVD $runtime·newosproc0(SB),R4 67 BL (R4) 68 69 restore: 70 // Restore callee-save registers. 71 MOVD 24(RSP), R19 72 MOVD 32(RSP), R20 73 MOVD 40(RSP), R21 74 MOVD 48(RSP), R22 75 MOVD 56(RSP), R23 76 MOVD 64(RSP), R24 77 MOVD 72(RSP), R25 78 MOVD 80(RSP), R26 79 MOVD 88(RSP), R27 80 FMOVD 96(RSP), F8 81 FMOVD 104(RSP), F9 82 FMOVD 112(RSP), F10 83 FMOVD 120(RSP), F11 84 FMOVD 128(RSP), F12 85 FMOVD 136(RSP), F13 86 FMOVD 144(RSP), F14 87 FMOVD 152(RSP), F15 88 MOVD 160(RSP), g 89 RET 90 91 TEXT _rt0_arm64_openbsd_lib_go(SB),NOSPLIT,$0 92 MOVD _rt0_arm64_openbsd_lib_argc<>(SB), R0 93 MOVD _rt0_arm64_openbsd_lib_argv<>(SB), R1 94 MOVD $runtime·rt0_go(SB),R4 95 B (R4) 96 97 DATA _rt0_arm64_openbsd_lib_argc<>(SB)/8, $0 98 GLOBL _rt0_arm64_openbsd_lib_argc<>(SB),NOPTR, $8 99 DATA _rt0_arm64_openbsd_lib_argv<>(SB)/8, $0 100 GLOBL _rt0_arm64_openbsd_lib_argv<>(SB),NOPTR, $8 101 102 103 TEXT main(SB),NOSPLIT|NOFRAME,$0 104 MOVD $runtime·rt0_go(SB), R2 105 BL (R2) 106 exit: 107 MOVD $0, R0 108 MOVD $1, R8 // sys_exit 109 INVOKE_SYSCALL 110 B exit