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Diffstat (limited to 'src/runtime/rt0_linux_arm64.s')
| -rw-r--r-- | src/runtime/rt0_linux_arm64.s | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/runtime/rt0_linux_arm64.s b/src/runtime/rt0_linux_arm64.s new file mode 100644 index 0000000..0eb8fc2 --- /dev/null +++ b/src/runtime/rt0_linux_arm64.s @@ -0,0 +1,73 @@ +// 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_linux(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_linux_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_linux_lib_argc<>(SB) + MOVD R1, _rt0_arm64_linux_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_linux_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_linux_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_linux_lib_go(SB),NOSPLIT,$0 + MOVD _rt0_arm64_linux_lib_argc<>(SB), R0 + MOVD _rt0_arm64_linux_lib_argv<>(SB), R1 + MOVD $runtime·rt0_go(SB),R4 + B (R4) + +DATA _rt0_arm64_linux_lib_argc<>(SB)/8, $0 +GLOBL _rt0_arm64_linux_lib_argc<>(SB),NOPTR, $8 +DATA _rt0_arm64_linux_lib_argv<>(SB)/8, $0 +GLOBL _rt0_arm64_linux_lib_argv<>(SB),NOPTR, $8 + + +TEXT main(SB),NOSPLIT|NOFRAME,$0 + MOVD $runtime·rt0_go(SB), R2 + BL (R2) +exit: + MOVD $0, R0 + MOVD $94, R8 // sys_exit + SVC + B exit |