2c4ae3b0a4
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
59 lines
2 KiB
ArmAsm
59 lines
2 KiB
ArmAsm
// Copyright 2023 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "textflag.h"
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// handleCheckXstateFault returns (the value stored in AX, the value stored in DI).
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// Control is transferred to it when checkXstate below receives SIGSEGV or SIGBUS,
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// with the faulting address stored in AX and the signal number stored in DI.
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//
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// It must have the same frame configuration as memcpy so that it can undo any
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// potential call frame set up by the assembler.
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TEXT handleCheckXstateFault(SB), NOSPLIT|NOFRAME, $0-26
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MOVQ AX, addr+8(FP)
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MOVL DI, sig+16(FP)
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LDMXCSR mxcsr+20(FP)
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BYTE $0xDB; BYTE $0xE2; // FNCLEX
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FLDCW cw+24(FP)
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RET
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// ·checkXstate verifies that the specified floating point state can be loaded.
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TEXT ·checkXstate(SB),NOSPLIT|NOFRAME,$0-26
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// Store 0 as the returned signal number. If we run to completion,
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// this is the value the caller will see; if a signal is received,
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// handleMemcpyFault will store a different value in this address.
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MOVL $0, sig+16(FP)
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// MXCSR and the x87 control word are the only floating point state
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// that is callee-save and thus we must save.
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STMXCSR mxcsr+20(FP)
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FSTCW cw+24(FP)
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MOVQ addr+0(FP), DI
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MOVL $0xffffffff, AX
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MOVL $0xffffffff, DX
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XRSTOR64 (DI)
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// Restore MXCSR and the x87 control word.
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LDMXCSR mxcsr+20(FP)
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BYTE $0xDB; BYTE $0xE2; // FNCLEX
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FLDCW cw+24(FP)
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RET
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// func addrOfCheckXstate() uintptr
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TEXT ·addrOfCheckXstate(SB), $0-8
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MOVQ $·checkXstate(SB), AX
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MOVQ AX, ret+0(FP)
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RET
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