mirror of
https://github.com/golang/go
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744ccbb852
Use AT_TIMEKEEP ELF aux entry to access a kernel mapped ring of timehands structs. The timehands are updated by the kernel periodically, but for accurate measure the timecounter still needs to be queried. Currently the fast path is used only when kern.timecounter.hardware==TSC-low or kern.timecounter.hardware=='ARM MPCore Timecounter', other timecounters revert back to regular system call. TODO: add support for HPET timecounter on 386/amd64. Change-Id: I321ca4e92be63ba21a2574b758ef5c1e729086ad Reviewed-on: https://go-review.googlesource.com/93156 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
461 lines
9.9 KiB
ArmAsm
461 lines
9.9 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 "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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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 uaddr1+16(FP), R10
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MOVQ ut+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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MOVL AX, ret+16(FP)
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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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// func exitThread(wait *uint32)
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TEXT runtime·exitThread(SB),NOSPLIT,$0-8
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MOVQ wait+0(FP), AX
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// We're done using the stack.
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MOVL $0, (AX)
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MOVL $0, DI // arg 1 long *state
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MOVL $431, AX // thr_exit
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SYSCALL
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MOVL $0xf1, 0xf1 // crash
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JMP 0(PC)
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TEXT runtime·open(SB),NOSPLIT,$-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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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+16(FP)
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RET
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TEXT runtime·closefd(SB),NOSPLIT,$-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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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·read(SB),NOSPLIT,$-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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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·write(SB),NOSPLIT,$-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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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+24(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·raiseproc(SB),NOSPLIT,$0
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// getpid
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MOVL $20, AX
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SYSCALL
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// kill(self, sig)
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MOVQ AX, DI // arg 1 pid
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MOVL sig+0(FP), SI // arg 2 sig
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MOVL $37, 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 fallback_walltime() (sec int64, nsec int32)
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TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12
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MOVL $232, AX // clock_gettime
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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·fallback_nanotime(SB), NOSPLIT, $32-8
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MOVL $232, AX
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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·asmSigaction(SB),NOSPLIT,$0
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MOVQ 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 $-1, AX
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·callCgoSigaction(SB),NOSPLIT,$16
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MOVQ 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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MOVQ _cgo_sigaction(SB), AX
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MOVQ SP, BX // callee-saved
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ANDQ $~15, SP // alignment as per amd64 psABI
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CALL AX
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MOVQ BX, SP
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
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MOVQ fn+0(FP), AX
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MOVL sig+8(FP), DI
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MOVQ info+16(FP), SI
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MOVQ ctx+24(FP), DX
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PUSHQ BP
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MOVQ SP, BP
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ANDQ $~15, SP // alignment for x86_64 ABI
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CALL AX
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MOVQ BP, SP
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POPQ BP
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$72
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// Save callee-saved C registers, since the caller may be a C signal handler.
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MOVQ BX, bx-8(SP)
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MOVQ BP, bp-16(SP) // save in case GOEXPERIMENT=noframepointer is set
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MOVQ R12, r12-24(SP)
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MOVQ R13, r13-32(SP)
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MOVQ R14, r14-40(SP)
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MOVQ R15, r15-48(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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MOVQ DX, ctx-56(SP)
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MOVQ SI, info-64(SP)
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MOVQ DI, signum-72(SP)
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CALL runtime·sigtrampgo(SB)
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MOVQ r15-48(SP), R15
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MOVQ r14-40(SP), R14
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MOVQ r13-32(SP), R13
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MOVQ r12-24(SP), R12
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MOVQ bp-16(SP), BP
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MOVQ bx-8(SP), BX
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RET
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// Used instead of sigtramp in programs that use cgo.
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// Arguments from kernel are in DI, SI, DX.
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TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
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// If no traceback function, do usual sigtramp.
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MOVQ runtime·cgoTraceback(SB), AX
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TESTQ AX, AX
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JZ sigtramp
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// If no traceback support function, which means that
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// runtime/cgo was not linked in, do usual sigtramp.
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MOVQ _cgo_callers(SB), AX
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TESTQ AX, AX
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JZ sigtramp
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// Figure out if we are currently in a cgo call.
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// If not, just do usual sigtramp.
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get_tls(CX)
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MOVQ g(CX),AX
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TESTQ AX, AX
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JZ sigtrampnog // g == nil
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MOVQ g_m(AX), AX
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TESTQ AX, AX
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JZ sigtramp // g.m == nil
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MOVL m_ncgo(AX), CX
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TESTL CX, CX
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JZ sigtramp // g.m.ncgo == 0
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MOVQ m_curg(AX), CX
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TESTQ CX, CX
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JZ sigtramp // g.m.curg == nil
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MOVQ g_syscallsp(CX), CX
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TESTQ CX, CX
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JZ sigtramp // g.m.curg.syscallsp == 0
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MOVQ m_cgoCallers(AX), R8
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TESTQ R8, R8
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JZ sigtramp // g.m.cgoCallers == nil
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MOVL m_cgoCallersUse(AX), CX
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TESTL CX, CX
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JNZ sigtramp // g.m.cgoCallersUse != 0
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// Jump to a function in runtime/cgo.
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// That function, written in C, will call the user's traceback
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// function with proper unwind info, and will then call back here.
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// The first three arguments, and the fifth, are already in registers.
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// Set the two remaining arguments now.
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MOVQ runtime·cgoTraceback(SB), CX
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MOVQ $runtime·sigtramp(SB), R9
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MOVQ _cgo_callers(SB), AX
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JMP AX
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sigtramp:
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JMP runtime·sigtramp(SB)
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sigtrampnog:
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// Signal arrived on a non-Go thread. If this is SIGPROF, get a
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// stack trace.
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CMPL DI, $27 // 27 == SIGPROF
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JNZ sigtramp
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// Lock sigprofCallersUse.
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MOVL $0, AX
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MOVL $1, CX
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MOVQ $runtime·sigprofCallersUse(SB), R11
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LOCK
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CMPXCHGL CX, 0(R11)
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JNZ sigtramp // Skip stack trace if already locked.
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// Jump to the traceback function in runtime/cgo.
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// It will call back to sigprofNonGo, which will ignore the
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// arguments passed in registers.
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// First three arguments to traceback function are in registers already.
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MOVQ runtime·cgoTraceback(SB), CX
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MOVQ $runtime·sigprofCallers(SB), R8
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MOVQ $runtime·sigprofNonGo(SB), R9
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MOVQ _cgo_callers(SB), AX
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JMP AX
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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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JCC ok
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MOVQ $0, p+32(FP)
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MOVQ AX, err+40(FP)
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RET
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ok:
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MOVQ AX, p+32(FP)
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MOVQ $0, err+40(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+0(FP), DI
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MOVQ old+8(FP), 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 $8, DI // adjust for ELF: wants to use -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 how+0(FP), DI // arg 1 - how
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MOVQ new+8(FP), SI // arg 2 - set
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MOVQ old+16(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 kq+0(FP), DI
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MOVQ ch+8(FP), SI
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MOVL nch+16(FP), DX
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MOVQ ev+24(FP), R10
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MOVL nev+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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// func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32
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TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-44
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MOVQ level+0(FP), DI
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MOVQ which+8(FP), SI
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MOVQ id+16(FP), DX
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MOVQ size+24(FP), R10
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MOVQ mask+32(FP), R8
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MOVL $487, 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+40(FP)
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RET
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