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https://github.com/golang/go
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a61a3c378d
Use CBZ to replace the comparison and branch of arm64 and the zero instruction in the assembly file. Change-Id: Id6c03e9af13aadafc3ad3953f82d2ffa29c12926 Reviewed-on: https://go-review.googlesource.com/c/go/+/237497 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
106 lines
2.5 KiB
ArmAsm
106 lines
2.5 KiB
ArmAsm
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// On FreeBSD argc/argv are passed in R0, not RSP
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TEXT _rt0_arm64_freebsd(SB),NOSPLIT|NOFRAME,$0
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ADD $8, R0, R1 // argv
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MOVD 0(R0), R0 // argc
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BL main(SB)
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// When building with -buildmode=c-shared, this symbol is called when the shared
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// library is loaded.
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TEXT _rt0_arm64_freebsd_lib(SB),NOSPLIT,$184
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// Preserve callee-save registers.
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MOVD R19, 24(RSP)
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MOVD R20, 32(RSP)
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MOVD R21, 40(RSP)
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MOVD R22, 48(RSP)
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MOVD R23, 56(RSP)
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MOVD R24, 64(RSP)
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MOVD R25, 72(RSP)
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MOVD R26, 80(RSP)
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MOVD R27, 88(RSP)
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FMOVD F8, 96(RSP)
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FMOVD F9, 104(RSP)
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FMOVD F10, 112(RSP)
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FMOVD F11, 120(RSP)
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FMOVD F12, 128(RSP)
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FMOVD F13, 136(RSP)
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FMOVD F14, 144(RSP)
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FMOVD F15, 152(RSP)
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MOVD g, 160(RSP)
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// Initialize g as null in case of using g later e.g. sigaction in cgo_sigaction.go
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MOVD ZR, g
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MOVD R0, _rt0_arm64_freebsd_lib_argc<>(SB)
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MOVD R1, _rt0_arm64_freebsd_lib_argv<>(SB)
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// Synchronous initialization.
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MOVD $runtime·libpreinit(SB), R4
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BL (R4)
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// Create a new thread to do the runtime initialization and return.
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MOVD _cgo_sys_thread_create(SB), R4
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CBZ R4, nocgo
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MOVD $_rt0_arm64_freebsd_lib_go(SB), R0
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MOVD $0, R1
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SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved.
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BL (R4)
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ADD $16, RSP
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B restore
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nocgo:
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MOVD $0x800000, R0 // stacksize = 8192KB
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MOVD $_rt0_arm64_freebsd_lib_go(SB), R1
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MOVD R0, 8(RSP)
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MOVD R1, 16(RSP)
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MOVD $runtime·newosproc0(SB),R4
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BL (R4)
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restore:
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// Restore callee-save registers.
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MOVD 24(RSP), R19
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MOVD 32(RSP), R20
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MOVD 40(RSP), R21
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MOVD 48(RSP), R22
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MOVD 56(RSP), R23
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MOVD 64(RSP), R24
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MOVD 72(RSP), R25
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MOVD 80(RSP), R26
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MOVD 88(RSP), R27
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FMOVD 96(RSP), F8
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FMOVD 104(RSP), F9
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FMOVD 112(RSP), F10
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FMOVD 120(RSP), F11
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FMOVD 128(RSP), F12
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FMOVD 136(RSP), F13
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FMOVD 144(RSP), F14
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FMOVD 152(RSP), F15
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MOVD 160(RSP), g
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RET
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TEXT _rt0_arm64_freebsd_lib_go(SB),NOSPLIT,$0
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MOVD _rt0_arm64_freebsd_lib_argc<>(SB), R0
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MOVD _rt0_arm64_freebsd_lib_argv<>(SB), R1
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MOVD $runtime·rt0_go(SB),R4
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B (R4)
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DATA _rt0_arm64_freebsd_lib_argc<>(SB)/8, $0
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GLOBL _rt0_arm64_freebsd_lib_argc<>(SB),NOPTR, $8
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DATA _rt0_arm64_freebsd_lib_argv<>(SB)/8, $0
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GLOBL _rt0_arm64_freebsd_lib_argv<>(SB),NOPTR, $8
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TEXT main(SB),NOSPLIT|NOFRAME,$0
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MOVD $runtime·rt0_go(SB), R2
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BL (R2)
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exit:
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MOVD $0, R0
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MOVD $1, R8 // SYS_exit
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SVC
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B exit
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