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-rw-r--r--src/runtime/rt0_openbsd_arm64.s110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/runtime/rt0_openbsd_arm64.s b/src/runtime/rt0_openbsd_arm64.s
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+++ b/src/runtime/rt0_openbsd_arm64.s
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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