diff options
Diffstat (limited to 'src/runtime/rt0_openbsd_arm64.s')
| -rw-r--r-- | src/runtime/rt0_openbsd_arm64.s | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/runtime/rt0_openbsd_arm64.s b/src/runtime/rt0_openbsd_arm64.s new file mode 100644 index 0000000..722fab6 --- /dev/null +++ b/src/runtime/rt0_openbsd_arm64.s @@ -0,0 +1,110 @@ +// 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 |