| // 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 |
