mirror of
https://github.com/golang/go
synced 2024-11-06 10:36:13 -07:00
0e3355903d
See https://golang.org/design/12914-monotonic for details. Fixes #12914. Change-Id: I80edc2e6c012b4ace7161c84cf067d444381a009 Reviewed-on: https://go-review.googlesource.com/36255 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Caleb Spare <cespare@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
599 lines
14 KiB
ArmAsm
599 lines
14 KiB
ArmAsm
// Copyright 2009 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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//
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// System calls and other sys.stuff for 386, Linux
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//
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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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// Most linux systems use glibc's dynamic linker, which puts the
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// __kernel_vsyscall vdso helper at 0x10(GS) for easy access from position
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// independent code and setldt in runtime does the same in the statically
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// linked case. However, systems that use alternative libc such as Android's
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// bionic and musl, do not save the helper anywhere, and so the only way to
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// invoke a syscall from position independent code is boring old int $0x80
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// (which is also what syscall wrappers in bionic/musl use).
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//
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// The benchmarks also showed that using int $0x80 is as fast as calling
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// *%gs:0x10 except on AMD Opteron. See https://golang.org/cl/19833
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// for the benchmark program and raw data.
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//#define INVOKE_SYSCALL CALL 0x10(GS) // non-portable
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#define INVOKE_SYSCALL INT $0x80
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TEXT runtime·exit(SB),NOSPLIT,$0
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MOVL $252, AX // syscall number
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MOVL code+0(FP), BX
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INVOKE_SYSCALL
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INT $3 // not reached
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RET
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TEXT runtime·exit1(SB),NOSPLIT,$0
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MOVL $1, AX // exit - exit the current os thread
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MOVL code+0(FP), BX
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INVOKE_SYSCALL
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INT $3 // not reached
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RET
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TEXT runtime·open(SB),NOSPLIT,$0
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MOVL $5, AX // syscall - open
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MOVL name+0(FP), BX
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MOVL mode+4(FP), CX
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MOVL perm+8(FP), DX
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+12(FP)
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RET
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TEXT runtime·closefd(SB),NOSPLIT,$0
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MOVL $6, AX // syscall - close
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MOVL fd+0(FP), BX
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+4(FP)
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RET
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TEXT runtime·write(SB),NOSPLIT,$0
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MOVL $4, AX // syscall - write
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MOVL fd+0(FP), BX
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MOVL p+4(FP), CX
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MOVL n+8(FP), DX
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+12(FP)
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RET
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TEXT runtime·read(SB),NOSPLIT,$0
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MOVL $3, AX // syscall - read
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MOVL fd+0(FP), BX
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MOVL p+4(FP), CX
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MOVL n+8(FP), DX
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+12(FP)
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RET
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TEXT runtime·getrlimit(SB),NOSPLIT,$0
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MOVL $191, AX // syscall - ugetrlimit
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MOVL kind+0(FP), BX
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MOVL limit+4(FP), CX
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INVOKE_SYSCALL
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·usleep(SB),NOSPLIT,$8
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MOVL $0, DX
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MOVL usec+0(FP), AX
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MOVL $1000000, CX
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DIVL CX
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MOVL AX, 0(SP)
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MOVL DX, 4(SP)
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// select(0, 0, 0, 0, &tv)
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MOVL $142, AX
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MOVL $0, BX
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MOVL $0, CX
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MOVL $0, DX
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MOVL $0, SI
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LEAL 0(SP), DI
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INVOKE_SYSCALL
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RET
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TEXT runtime·gettid(SB),NOSPLIT,$0-4
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MOVL $224, AX // syscall - gettid
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INVOKE_SYSCALL
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MOVL AX, ret+0(FP)
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RET
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TEXT runtime·raise(SB),NOSPLIT,$12
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MOVL $224, AX // syscall - gettid
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INVOKE_SYSCALL
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MOVL AX, BX // arg 1 tid
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MOVL sig+0(FP), CX // arg 2 signal
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MOVL $238, AX // syscall - tkill
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INVOKE_SYSCALL
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$12
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MOVL $20, AX // syscall - getpid
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INVOKE_SYSCALL
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MOVL AX, BX // arg 1 pid
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MOVL sig+0(FP), CX // arg 2 signal
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MOVL $37, AX // syscall - kill
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INVOKE_SYSCALL
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RET
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TEXT runtime·setitimer(SB),NOSPLIT,$0-12
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MOVL $104, AX // syscall - setitimer
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MOVL mode+0(FP), BX
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MOVL new+4(FP), CX
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MOVL old+8(FP), DX
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INVOKE_SYSCALL
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RET
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TEXT runtime·mincore(SB),NOSPLIT,$0-16
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MOVL $218, AX // syscall - mincore
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MOVL addr+0(FP), BX
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MOVL n+4(FP), CX
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MOVL dst+8(FP), DX
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INVOKE_SYSCALL
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MOVL AX, ret+12(FP)
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RET
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// func walltime() (sec int64, nsec int32)
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TEXT runtime·walltime(SB), NOSPLIT, $32
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MOVL $265, AX // syscall - clock_gettime
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MOVL $0, BX // CLOCK_REALTIME
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LEAL 8(SP), CX
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MOVL $0, DX
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INVOKE_SYSCALL
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MOVL 8(SP), AX // sec
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MOVL 12(SP), BX // nsec
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// sec is in AX, nsec in BX
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MOVL AX, sec+0(FP)
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MOVL $0, sec+4(FP)
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MOVL BX, nsec+8(FP)
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RET
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// int64 nanotime(void) so really
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// void nanotime(int64 *nsec)
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TEXT runtime·nanotime(SB), NOSPLIT, $32
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MOVL $265, AX // syscall - clock_gettime
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MOVL $1, BX // CLOCK_MONOTONIC
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LEAL 8(SP), CX
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MOVL $0, DX
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INVOKE_SYSCALL
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MOVL 8(SP), AX // sec
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MOVL 12(SP), BX // nsec
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// sec is in AX, nsec in BX
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// convert to DX:AX nsec
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MOVL $1000000000, CX
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MULL CX
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ADDL BX, AX
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ADCL $0, DX
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MOVL AX, ret_lo+0(FP)
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MOVL DX, ret_hi+4(FP)
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RET
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TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0
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MOVL $175, AX // syscall entry
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MOVL how+0(FP), BX
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MOVL new+4(FP), CX
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MOVL old+8(FP), DX
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MOVL size+12(FP), SI
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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INT $3
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RET
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TEXT runtime·rt_sigaction(SB),NOSPLIT,$0
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MOVL $174, AX // syscall - rt_sigaction
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MOVL sig+0(FP), BX
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MOVL new+4(FP), CX
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MOVL old+8(FP), DX
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MOVL size+12(FP), SI
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INVOKE_SYSCALL
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MOVL AX, ret+16(FP)
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$12-16
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MOVL fn+0(FP), AX
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MOVL sig+4(FP), BX
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MOVL info+8(FP), CX
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MOVL ctx+12(FP), DX
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MOVL SP, SI
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SUBL $32, SP
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ANDL $-15, SP // align stack: handler might be a C function
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MOVL BX, 0(SP)
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MOVL CX, 4(SP)
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MOVL DX, 8(SP)
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MOVL SI, 12(SP) // save SI: handler might be a Go function
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CALL AX
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MOVL 12(SP), AX
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MOVL AX, SP
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$28
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// Save callee-saved C registers, since the caller may be a C signal handler.
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MOVL BX, bx-4(SP)
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MOVL BP, bp-8(SP)
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MOVL SI, si-12(SP)
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MOVL DI, di-16(SP)
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// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
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// modify them.
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MOVL sig+0(FP), BX
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MOVL BX, 0(SP)
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MOVL info+4(FP), BX
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MOVL BX, 4(SP)
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MOVL ctx+8(FP), BX
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MOVL BX, 8(SP)
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CALL runtime·sigtrampgo(SB)
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MOVL di-16(SP), DI
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MOVL si-12(SP), SI
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MOVL bp-8(SP), BP
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MOVL bx-4(SP), BX
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RET
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TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
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JMP runtime·sigtramp(SB)
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TEXT runtime·sigreturn(SB),NOSPLIT,$0
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MOVL $173, AX // rt_sigreturn
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// Sigreturn expects same SP as signal handler,
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// so cannot CALL 0x10(GS) here.
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INT $0x80
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INT $3 // not reached
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RET
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TEXT runtime·mmap(SB),NOSPLIT,$0
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MOVL $192, AX // mmap2
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MOVL addr+0(FP), BX
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MOVL n+4(FP), CX
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MOVL prot+8(FP), DX
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MOVL flags+12(FP), SI
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MOVL fd+16(FP), DI
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MOVL off+20(FP), BP
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SHRL $12, BP
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 3(PC)
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NOTL AX
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INCL AX
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·munmap(SB),NOSPLIT,$0
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MOVL $91, AX // munmap
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MOVL addr+0(FP), BX
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MOVL n+4(FP), CX
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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INT $3
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RET
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TEXT runtime·madvise(SB),NOSPLIT,$0
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MOVL $219, AX // madvise
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MOVL addr+0(FP), BX
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MOVL n+4(FP), CX
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MOVL flags+8(FP), DX
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INVOKE_SYSCALL
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// ignore failure - maybe pages are locked
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RET
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// int32 futex(int32 *uaddr, int32 op, int32 val,
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// struct timespec *timeout, int32 *uaddr2, int32 val2);
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TEXT runtime·futex(SB),NOSPLIT,$0
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MOVL $240, AX // futex
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MOVL addr+0(FP), BX
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MOVL op+4(FP), CX
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MOVL val+8(FP), DX
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MOVL ts+12(FP), SI
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MOVL addr2+16(FP), DI
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MOVL val3+20(FP), BP
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INVOKE_SYSCALL
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MOVL AX, ret+24(FP)
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RET
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// int32 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void));
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TEXT runtime·clone(SB),NOSPLIT,$0
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MOVL $120, AX // clone
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MOVL flags+0(FP), BX
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MOVL stk+4(FP), CX
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MOVL $0, DX // parent tid ptr
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MOVL $0, DI // child tid ptr
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// Copy mp, gp, fn off parent stack for use by child.
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SUBL $16, CX
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MOVL mp+8(FP), SI
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MOVL SI, 0(CX)
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MOVL gp+12(FP), SI
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MOVL SI, 4(CX)
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MOVL fn+16(FP), SI
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MOVL SI, 8(CX)
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MOVL $1234, 12(CX)
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// cannot use CALL 0x10(GS) here, because the stack changes during the
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// system call (after CALL 0x10(GS), the child is still using the
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// parent's stack when executing its RET instruction).
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INT $0x80
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// In parent, return.
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CMPL AX, $0
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JEQ 3(PC)
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MOVL AX, ret+20(FP)
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RET
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// Paranoia: check that SP is as we expect.
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MOVL 12(SP), BP
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CMPL BP, $1234
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JEQ 2(PC)
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INT $3
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// Initialize AX to Linux tid
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MOVL $224, AX
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INVOKE_SYSCALL
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MOVL 0(SP), BX // m
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MOVL 4(SP), DX // g
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MOVL 8(SP), SI // fn
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CMPL BX, $0
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JEQ nog
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CMPL DX, $0
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JEQ nog
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MOVL AX, m_procid(BX) // save tid as m->procid
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// set up ldt 7+id to point at m->tls.
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LEAL m_tls(BX), BP
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MOVL m_id(BX), DI
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ADDL $7, DI // m0 is LDT#7. count up.
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// setldt(tls#, &tls, sizeof tls)
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PUSHAL // save registers
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PUSHL $32 // sizeof tls
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PUSHL BP // &tls
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PUSHL DI // tls #
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CALL runtime·setldt(SB)
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POPL AX
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POPL AX
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POPL AX
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POPAL
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// Now segment is established. Initialize m, g.
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get_tls(AX)
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MOVL DX, g(AX)
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MOVL BX, g_m(DX)
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CALL runtime·stackcheck(SB) // smashes AX, CX
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MOVL 0(DX), DX // paranoia; check they are not nil
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MOVL 0(BX), BX
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// more paranoia; check that stack splitting code works
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PUSHAL
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CALL runtime·emptyfunc(SB)
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POPAL
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nog:
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CALL SI // fn()
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CALL runtime·exit1(SB)
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MOVL $0x1234, 0x1005
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TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
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MOVL $186, AX // sigaltstack
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MOVL new+0(FP), BX
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MOVL old+4(FP), CX
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INVOKE_SYSCALL
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CMPL AX, $0xfffff001
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JLS 2(PC)
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INT $3
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RET
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// <asm-i386/ldt.h>
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// struct user_desc {
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// unsigned int entry_number;
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// unsigned long base_addr;
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// unsigned int limit;
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// unsigned int seg_32bit:1;
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// unsigned int contents:2;
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// unsigned int read_exec_only:1;
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// unsigned int limit_in_pages:1;
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// unsigned int seg_not_present:1;
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// unsigned int useable:1;
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// };
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#define SEG_32BIT 0x01
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// contents are the 2 bits 0x02 and 0x04.
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#define CONTENTS_DATA 0x00
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#define CONTENTS_STACK 0x02
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#define CONTENTS_CODE 0x04
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#define READ_EXEC_ONLY 0x08
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#define LIMIT_IN_PAGES 0x10
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#define SEG_NOT_PRESENT 0x20
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#define USEABLE 0x40
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// `-1` means the kernel will pick a TLS entry on the first setldt call,
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// which happens during runtime init, and that we'll store back the saved
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// entry and reuse that on subsequent calls when creating new threads.
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DATA runtime·tls_entry_number+0(SB)/4, $-1
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GLOBL runtime·tls_entry_number(SB), NOPTR, $4
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// setldt(int entry, int address, int limit)
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// We use set_thread_area, which mucks with the GDT, instead of modify_ldt,
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// which would modify the LDT, but is disabled on some kernels.
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// The name, setldt, is a misnomer, although we leave this name as it is for
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// the compatibility with other platforms.
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TEXT runtime·setldt(SB),NOSPLIT,$32
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MOVL address+4(FP), DX // base address
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#ifdef GOOS_android
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/*
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* Same as in sys_darwin_386.s:/ugliness, different constant.
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* address currently holds m->tls, which must be %gs:0xf8.
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* See cgo/gcc_android_386.c for the derivation of the constant.
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*/
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SUBL $0xf8, DX
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MOVL DX, 0(DX)
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#else
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/*
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* When linking against the system libraries,
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* we use its pthread_create and let it set up %gs
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* for us. When we do that, the private storage
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* we get is not at 0(GS), but -4(GS).
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* To insulate the rest of the tool chain from this
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* ugliness, 8l rewrites 0(TLS) into -4(GS) for us.
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* To accommodate that rewrite, we translate
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* the address here and bump the limit to 0xffffffff (no limit)
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* so that -4(GS) maps to 0(address).
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* Also, the final 0(GS) (current 4(DX)) has to point
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* to itself, to mimic ELF.
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*/
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ADDL $0x4, DX // address
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MOVL DX, 0(DX)
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#endif
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// get entry number
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MOVL runtime·tls_entry_number(SB), CX
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// set up user_desc
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LEAL 16(SP), AX // struct user_desc
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MOVL CX, 0(AX) // unsigned int entry_number
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MOVL DX, 4(AX) // unsigned long base_addr
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MOVL $0xfffff, 8(AX) // unsigned int limit
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MOVL $(SEG_32BIT|LIMIT_IN_PAGES|USEABLE|CONTENTS_DATA), 12(AX) // flag bits
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// call set_thread_area
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MOVL AX, BX // user_desc
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MOVL $243, AX // syscall - set_thread_area
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// We can't call this via 0x10(GS) because this is called from setldt0 to set that up.
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INT $0x80
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// breakpoint on error
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CMPL AX, $0xfffff001
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JLS 2(PC)
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INT $3
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// read allocated entry number back out of user_desc
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LEAL 16(SP), AX // get our user_desc back
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MOVL 0(AX), AX
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// store entry number if the kernel allocated it
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CMPL CX, $-1
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JNE 2(PC)
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MOVL AX, runtime·tls_entry_number(SB)
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// compute segment selector - (entry*8+3)
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SHLL $3, AX
|
|
ADDL $3, AX
|
|
MOVW AX, GS
|
|
|
|
RET
|
|
|
|
TEXT runtime·osyield(SB),NOSPLIT,$0
|
|
MOVL $158, AX
|
|
INVOKE_SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
|
|
MOVL $242, AX // syscall - sched_getaffinity
|
|
MOVL pid+0(FP), BX
|
|
MOVL len+4(FP), CX
|
|
MOVL buf+8(FP), DX
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+12(FP)
|
|
RET
|
|
|
|
// int32 runtime·epollcreate(int32 size);
|
|
TEXT runtime·epollcreate(SB),NOSPLIT,$0
|
|
MOVL $254, AX
|
|
MOVL size+0(FP), BX
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+4(FP)
|
|
RET
|
|
|
|
// int32 runtime·epollcreate1(int32 flags);
|
|
TEXT runtime·epollcreate1(SB),NOSPLIT,$0
|
|
MOVL $329, AX
|
|
MOVL flags+0(FP), BX
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+4(FP)
|
|
RET
|
|
|
|
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
|
|
TEXT runtime·epollctl(SB),NOSPLIT,$0
|
|
MOVL $255, AX
|
|
MOVL epfd+0(FP), BX
|
|
MOVL op+4(FP), CX
|
|
MOVL fd+8(FP), DX
|
|
MOVL ev+12(FP), SI
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+16(FP)
|
|
RET
|
|
|
|
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
|
|
TEXT runtime·epollwait(SB),NOSPLIT,$0
|
|
MOVL $256, AX
|
|
MOVL epfd+0(FP), BX
|
|
MOVL ev+4(FP), CX
|
|
MOVL nev+8(FP), DX
|
|
MOVL timeout+12(FP), SI
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+16(FP)
|
|
RET
|
|
|
|
// void runtime·closeonexec(int32 fd);
|
|
TEXT runtime·closeonexec(SB),NOSPLIT,$0
|
|
MOVL $55, AX // fcntl
|
|
MOVL fd+0(FP), BX // fd
|
|
MOVL $2, CX // F_SETFD
|
|
MOVL $1, DX // FD_CLOEXEC
|
|
INVOKE_SYSCALL
|
|
RET
|
|
|
|
// int access(const char *name, int mode)
|
|
TEXT runtime·access(SB),NOSPLIT,$0
|
|
MOVL $33, AX // syscall - access
|
|
MOVL name+0(FP), BX
|
|
MOVL mode+4(FP), CX
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+8(FP)
|
|
RET
|
|
|
|
// int connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
|
|
TEXT runtime·connect(SB),NOSPLIT,$0-16
|
|
// connect is implemented as socketcall(NR_socket, 3, *(rest of args))
|
|
// stack already should have fd, addr, addrlen.
|
|
MOVL $102, AX // syscall - socketcall
|
|
MOVL $3, BX // connect
|
|
LEAL fd+0(FP), CX
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+12(FP)
|
|
RET
|
|
|
|
// int socket(int domain, int type, int protocol)
|
|
TEXT runtime·socket(SB),NOSPLIT,$0-16
|
|
// socket is implemented as socketcall(NR_socket, 1, *(rest of args))
|
|
// stack already should have domain, type, protocol.
|
|
MOVL $102, AX // syscall - socketcall
|
|
MOVL $1, BX // socket
|
|
LEAL domain+0(FP), CX
|
|
INVOKE_SYSCALL
|
|
MOVL AX, ret+12(FP)
|
|
RET
|