mirror of
https://github.com/golang/go
synced 2024-11-19 22:04:44 -07:00
c007ce824d
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
358 lines
7.7 KiB
ArmAsm
358 lines
7.7 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 AMD64, FreeBSD
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// /usr/src/sys/kern/syscalls.master for syscall numbers.
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//
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#include "zasm_GOOS_GOARCH.h"
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#include "textflag.h"
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// FreeBSD 8, FreeBSD 9, and older versions that I have checked
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// do not restore R10 on exit from a "restarted" system call
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// if you use the SYSCALL instruction. This means that, for example,
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// if a signal arrives while the wait4 system call is executing,
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// the wait4 internally returns ERESTART, which makes the kernel
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// back up the PC to execute the SYSCALL instruction a second time.
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// However, since the kernel does not restore R10, the fourth
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// argument to the system call has been lost. (FreeBSD 9 also fails
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// to restore the fifth and sixth arguments, R8 and R9, although
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// some earlier versions did restore those correctly.)
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// The broken code is in fast_syscall in FreeBSD's amd64/amd64/exception.S.
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// It restores only DI, SI, DX, AX, and RFLAGS on system call return.
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// http://fxr.watson.org/fxr/source/amd64/amd64/exception.S?v=FREEBSD91#L399
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//
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// The INT $0x80 system call path (int0x80_syscall in FreeBSD's
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// amd64/ia32/ia32_exception.S) does not have this problem,
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// but it expects the third argument in R10. Instead of rewriting
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// all the assembly in this file, #define SYSCALL to a safe simulation
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// using INT $0x80.
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//
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// INT $0x80 is a little slower than SYSCALL, but correctness wins.
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//
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// See golang.org/issue/6372.
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#define SYSCALL MOVQ R10, CX; INT $0x80
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TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI
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MOVL mode+8(FP), SI
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MOVL val+12(FP), DX
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MOVQ ptr2+16(FP), R10
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MOVQ ts+24(FP), R8
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MOVL $454, AX
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SYSCALL
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MOVL AX, ret+32(FP)
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RET
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TEXT runtime·thr_new(SB),NOSPLIT,$0
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MOVQ param+0(FP), DI
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MOVL size+8(FP), SI
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MOVL $455, AX
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SYSCALL
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RET
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TEXT runtime·thr_start(SB),NOSPLIT,$0
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MOVQ DI, R13 // m
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// set up FS to point at m->tls
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LEAQ m_tls(R13), DI
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CALL runtime·settls(SB) // smashes DI
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// set up m, g
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get_tls(CX)
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MOVQ m_g0(R13), DI
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MOVQ R13, g_m(DI)
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MOVQ DI, g(CX)
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CALL runtime·stackcheck(SB)
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CALL runtime·mstart(SB)
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MOVQ 0, AX // crash (not reached)
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// Exit the entire program (like C exit)
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TEXT runtime·exit(SB),NOSPLIT,$-8
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MOVL code+0(FP), DI // arg 1 exit status
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MOVL $1, AX
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SYSCALL
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·exit1(SB),NOSPLIT,$-8
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MOVL code+0(FP), DI // arg 1 exit status
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MOVL $431, AX
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SYSCALL
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·open(SB),NOSPLIT,$-8
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MOVQ name+0(FP), DI // arg 1 pathname
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MOVL mode+8(FP), SI // arg 2 flags
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MOVL perm+12(FP), DX // arg 3 mode
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MOVL $5, AX
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SYSCALL
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MOVL AX, ret+16(FP)
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RET
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TEXT runtime·close(SB),NOSPLIT,$-8
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MOVL fd+0(FP), DI // arg 1 fd
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MOVL $6, AX
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SYSCALL
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·read(SB),NOSPLIT,$-8
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MOVL fd+0(FP), DI // arg 1 fd
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MOVQ p+8(FP), SI // arg 2 buf
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MOVL n+16(FP), DX // arg 3 count
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MOVL $3, AX
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SYSCALL
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·write(SB),NOSPLIT,$-8
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MOVQ fd+0(FP), DI // arg 1 fd
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MOVQ p+8(FP), SI // arg 2 buf
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MOVL n+16(FP), DX // arg 3 count
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MOVL $4, AX
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SYSCALL
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·getrlimit(SB),NOSPLIT,$-8
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MOVL kind+0(FP), DI
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MOVQ limit+8(FP), SI
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MOVL $194, AX
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SYSCALL
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MOVL AX, ret+16(FP)
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RET
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TEXT runtime·raise(SB),NOSPLIT,$16
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// thr_self(&8(SP))
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LEAQ 8(SP), DI // arg 1 &8(SP)
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MOVL $432, AX
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SYSCALL
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// thr_kill(self, SIGPIPE)
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MOVQ 8(SP), DI // arg 1 id
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MOVL sig+0(FP), SI // arg 2
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MOVL $433, AX
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SYSCALL
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RET
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TEXT runtime·setitimer(SB), NOSPLIT, $-8
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MOVL mode+0(FP), DI
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MOVQ new+8(FP), SI
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MOVQ old+16(FP), DX
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MOVL $83, AX
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SYSCALL
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RET
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// func now() (sec int64, nsec int32)
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TEXT time·now(SB), NOSPLIT, $32
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MOVL $232, AX
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MOVQ $0, DI // CLOCK_REALTIME
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LEAQ 8(SP), SI
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SYSCALL
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MOVQ 8(SP), AX // sec
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MOVQ 16(SP), DX // nsec
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// sec is in AX, nsec in DX
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MOVQ AX, sec+0(FP)
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MOVL DX, nsec+8(FP)
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RET
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TEXT runtime·nanotime(SB), NOSPLIT, $32
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MOVL $232, AX
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// We can use CLOCK_MONOTONIC_FAST here when we drop
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// support for FreeBSD 8-STABLE.
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MOVQ $4, DI // CLOCK_MONOTONIC
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LEAQ 8(SP), SI
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SYSCALL
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MOVQ 8(SP), AX // sec
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MOVQ 16(SP), DX // nsec
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// sec is in AX, nsec in DX
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// return nsec in AX
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IMULQ $1000000000, AX
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ADDQ DX, AX
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MOVQ AX, ret+0(FP)
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RET
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TEXT runtime·sigaction(SB),NOSPLIT,$-8
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MOVL sig+0(FP), DI // arg 1 sig
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MOVQ new+8(FP), SI // arg 2 act
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MOVQ old+16(FP), DX // arg 3 oact
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MOVL $416, AX
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$64
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get_tls(BX)
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// check that g exists
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MOVQ g(BX), R10
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CMPQ R10, $0
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JNE 5(PC)
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MOVQ DI, 0(SP)
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MOVQ $runtime·badsignal(SB), AX
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CALL AX
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RET
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// save g
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MOVQ R10, 40(SP)
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// g = m->signal
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MOVQ g_m(R10), BP
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MOVQ m_gsignal(BP), BP
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MOVQ BP, g(BX)
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MOVQ DI, 0(SP)
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MOVQ SI, 8(SP)
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MOVQ DX, 16(SP)
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MOVQ R10, 24(SP)
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CALL runtime·sighandler(SB)
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// restore g
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get_tls(BX)
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MOVQ 40(SP), R10
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MOVQ R10, g(BX)
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RET
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TEXT runtime·mmap(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI // arg 1 addr
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MOVQ n+8(FP), SI // arg 2 len
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MOVL prot+16(FP), DX // arg 3 prot
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MOVL flags+20(FP), R10 // arg 4 flags
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MOVL fd+24(FP), R8 // arg 5 fid
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MOVL off+28(FP), R9 // arg 6 offset
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MOVL $477, AX
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SYSCALL
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MOVQ AX, ret+32(FP)
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RET
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TEXT runtime·munmap(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI // arg 1 addr
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MOVQ n+8(FP), SI // arg 2 len
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MOVL $73, AX
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·madvise(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI
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MOVQ n+8(FP), SI
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MOVL flags+16(FP), DX
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MOVQ $75, AX // madvise
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SYSCALL
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// ignore failure - maybe pages are locked
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RET
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TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
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MOVQ new+8(SP), DI
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MOVQ old+16(SP), SI
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MOVQ $53, AX
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·usleep(SB),NOSPLIT,$16
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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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MOVQ AX, 0(SP) // tv_sec
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MOVL $1000, AX
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MULL DX
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MOVQ AX, 8(SP) // tv_nsec
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MOVQ SP, DI // arg 1 - rqtp
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MOVQ $0, SI // arg 2 - rmtp
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MOVL $240, AX // sys_nanosleep
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SYSCALL
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RET
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// set tls base to DI
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TEXT runtime·settls(SB),NOSPLIT,$8
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ADDQ $16, DI // adjust for ELF: wants to use -16(FS) and -8(FS) for g and m
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MOVQ DI, 0(SP)
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MOVQ SP, SI
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MOVQ $129, DI // AMD64_SET_FSBASE
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MOVQ $165, AX // sysarch
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·sysctl(SB),NOSPLIT,$0
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MOVQ mib+0(FP), DI // arg 1 - name
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MOVL miblen+8(FP), SI // arg 2 - namelen
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MOVQ out+16(FP), DX // arg 3 - oldp
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MOVQ size+24(FP), R10 // arg 4 - oldlenp
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MOVQ dst+32(FP), R8 // arg 5 - newp
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MOVQ ndst+40(FP), R9 // arg 6 - newlen
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MOVQ $202, AX // sys___sysctl
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SYSCALL
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JCC 4(PC)
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NEGQ AX
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MOVL AX, ret+48(FP)
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RET
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MOVL $0, AX
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MOVL AX, ret+48(FP)
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RET
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TEXT runtime·osyield(SB),NOSPLIT,$-4
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MOVL $331, AX // sys_sched_yield
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SYSCALL
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RET
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TEXT runtime·sigprocmask(SB),NOSPLIT,$0
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MOVL $3, DI // arg 1 - how (SIG_SETMASK)
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MOVQ new+0(FP), SI // arg 2 - set
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MOVQ old+8(FP), DX // arg 3 - oset
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MOVL $340, AX // sys_sigprocmask
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SYSCALL
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JAE 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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// int32 runtime·kqueue(void);
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TEXT runtime·kqueue(SB),NOSPLIT,$0
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MOVQ $0, DI
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MOVQ $0, SI
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MOVQ $0, DX
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MOVL $362, AX
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SYSCALL
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JCC 2(PC)
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NEGQ AX
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MOVL AX, ret+0(FP)
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RET
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// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
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TEXT runtime·kevent(SB),NOSPLIT,$0
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MOVL fd+0(FP), DI
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MOVQ ev1+8(FP), SI
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MOVL nev1+16(FP), DX
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MOVQ ev2+24(FP), R10
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MOVL nev2+32(FP), R8
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MOVQ ts+40(FP), R9
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MOVL $363, AX
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SYSCALL
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JCC 2(PC)
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NEGQ AX
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MOVL AX, ret+48(FP)
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RET
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// void runtime·closeonexec(int32 fd);
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TEXT runtime·closeonexec(SB),NOSPLIT,$0
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MOVL fd+0(FP), DI // fd
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MOVQ $2, SI // F_SETFD
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MOVQ $1, DX // FD_CLOEXEC
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MOVL $92, AX // fcntl
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SYSCALL
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RET
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