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| author | Michael Pratt <mpratt@google.com> | 2022-02-08 16:45:14 -0500 |
|---|---|---|
| committer | Michael Pratt <mpratt@google.com> | 2022-02-15 15:40:29 +0000 |
| commit | 0b321c9a7c0055dfd3f875dea930a28690659211 (patch) | |
| tree | f4504789261c7f1ee34ea3e5cd47c3f3ecdc0582 /src/runtime/internal/syscall/asm_linux_amd64.s | |
| parent | 7a132d6f4e319b307f185c73a8492bfa706fe678 (diff) | |
| download | go-0b321c9a7c0055dfd3f875dea930a28690659211.tar.xz | |
runtime/internal/syscall: new package for linux
Add a generic syscall package for use by the runtime. Eventually we'd
like to clean up system calls in the runtime to use more code generation
and be moved out of the main runtime package.
The implementations of the assembly functions are based on copies of
syscall.RawSyscall6, modified slightly for more consistency between
arches. e.g., renamed trap to num, always set syscall num register
first.
For now, this package is just the bare minimum needed for
doAllThreadsSyscall to make an arbitrary syscall.
For #51087.
For #50113.
Change-Id: Ibecb5e6303279ce15286759e1cd6a2ddc52f7c72
Reviewed-on: https://go-review.googlesource.com/c/go/+/383999
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime/internal/syscall/asm_linux_amd64.s')
| -rw-r--r-- | src/runtime/internal/syscall/asm_linux_amd64.s | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/runtime/internal/syscall/asm_linux_amd64.s b/src/runtime/internal/syscall/asm_linux_amd64.s new file mode 100644 index 0000000000..961d9bd640 --- /dev/null +++ b/src/runtime/internal/syscall/asm_linux_amd64.s @@ -0,0 +1,33 @@ +// Copyright 2022 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" + +// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr) +// +// Syscall # in AX, args in DI SI DX R10 R8 R9, return in AX DX. +// +// Note that this differs from "standard" ABI convention, which would pass 4th +// arg in CX, not R10. +TEXT ·Syscall6(SB),NOSPLIT,$0-80 + MOVQ num+0(FP), AX // syscall entry + MOVQ a1+8(FP), DI + MOVQ a2+16(FP), SI + MOVQ a3+24(FP), DX + MOVQ a4+32(FP), R10 + MOVQ a5+40(FP), R8 + MOVQ a6+48(FP), R9 + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok + MOVQ $-1, r1+56(FP) + MOVQ $0, r2+64(FP) + NEGQ AX + MOVQ AX, errno+72(FP) + RET +ok: + MOVQ AX, r1+56(FP) + MOVQ DX, r2+64(FP) + MOVQ $0, errno+72(FP) + RET |