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-rw-r--r--src/runtime/rt0_darwin_arm64.s63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/runtime/rt0_darwin_arm64.s b/src/runtime/rt0_darwin_arm64.s
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+// Copyright 2015 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"
+
+TEXT _rt0_arm64_darwin(SB),NOSPLIT|NOFRAME,$0
+ MOVD $runtime·rt0_go(SB), R2
+ BL (R2)
+exit:
+ MOVD $0, R0
+ MOVD $1, R16 // sys_exit
+ SVC $0x80
+ B exit
+
+// When linking with -buildmode=c-archive or -buildmode=c-shared,
+// this symbol is called from a global initialization function.
+//
+// Note that all currently shipping darwin/arm64 platforms require
+// cgo and do not support c-shared.
+TEXT _rt0_arm64_darwin_lib(SB),NOSPLIT,$152
+ // Preserve callee-save registers.
+ SAVE_R19_TO_R28(8)
+ SAVE_F8_TO_F15(88)
+
+ MOVD R0, _rt0_arm64_darwin_lib_argc<>(SB)
+ MOVD R1, _rt0_arm64_darwin_lib_argv<>(SB)
+
+ MOVD $0, g // initialize g to nil
+
+ // 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
+ MOVD $_rt0_arm64_darwin_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
+
+ // Restore callee-save registers.
+ RESTORE_R19_TO_R28(8)
+ RESTORE_F8_TO_F15(88)
+
+ RET
+
+TEXT _rt0_arm64_darwin_lib_go(SB),NOSPLIT,$0
+ MOVD _rt0_arm64_darwin_lib_argc<>(SB), R0
+ MOVD _rt0_arm64_darwin_lib_argv<>(SB), R1
+ MOVD $runtime·rt0_go(SB), R4
+ B (R4)
+
+DATA _rt0_arm64_darwin_lib_argc<>(SB)/8, $0
+GLOBL _rt0_arm64_darwin_lib_argc<>(SB),NOPTR, $8
+DATA _rt0_arm64_darwin_lib_argv<>(SB)/8, $0
+GLOBL _rt0_arm64_darwin_lib_argv<>(SB),NOPTR, $8
+
+// external linking entry point.
+TEXT main(SB),NOSPLIT|NOFRAME,$0
+ JMP _rt0_arm64_darwin(SB)