mirror of
https://github.com/golang/go
synced 2024-11-20 03:24:41 -07:00
872b168fe3
In the past badsignal would crash the program. In https://golang.org/cl/10757044 badsignal was changed to call sigsend, to fix issue #3250. The effect of this was that when a non-Go thread received a signal, and os/signal.Notify was not being used to check for occurrences of the signal, the signal was ignored. This changes the code so that if os/signal.Notify is not being used, then the signal handler is reset to what it was, and the signal is raised again. This lets non-Go threads handle the signal as they wish. In particular, it means that a segmentation violation in a non-Go thread will ordinarily crash the process, as it should. Fixes #10139. Update #11794. Change-Id: I2109444aaada9d963ad03b1d071ec667760515e5 Reviewed-on: https://go-review.googlesource.com/12503 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org>
431 lines
8.5 KiB
ArmAsm
431 lines
8.5 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
//
|
|
// System calls and other sys.stuff for AMD64, Linux
|
|
//
|
|
|
|
#include "go_asm.h"
|
|
#include "go_tls.h"
|
|
#include "textflag.h"
|
|
|
|
TEXT runtime·exit(SB),NOSPLIT,$0-4
|
|
MOVL code+0(FP), DI
|
|
MOVL $231, AX // exitgroup - force all os threads to exit
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·exit1(SB),NOSPLIT,$0-4
|
|
MOVL code+0(FP), DI
|
|
MOVL $60, AX // exit - exit the current os thread
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·open(SB),NOSPLIT,$0-20
|
|
MOVQ name+0(FP), DI
|
|
MOVL mode+8(FP), SI
|
|
MOVL perm+12(FP), DX
|
|
MOVL $2, AX // syscall entry
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $-1, AX
|
|
MOVL AX, ret+16(FP)
|
|
RET
|
|
|
|
TEXT runtime·closefd(SB),NOSPLIT,$0-12
|
|
MOVL fd+0(FP), DI
|
|
MOVL $3, AX // syscall entry
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $-1, AX
|
|
MOVL AX, ret+8(FP)
|
|
RET
|
|
|
|
TEXT runtime·write(SB),NOSPLIT,$0-28
|
|
MOVQ fd+0(FP), DI
|
|
MOVQ p+8(FP), SI
|
|
MOVL n+16(FP), DX
|
|
MOVL $1, AX // syscall entry
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $-1, AX
|
|
MOVL AX, ret+24(FP)
|
|
RET
|
|
|
|
TEXT runtime·read(SB),NOSPLIT,$0-28
|
|
MOVL fd+0(FP), DI
|
|
MOVQ p+8(FP), SI
|
|
MOVL n+16(FP), DX
|
|
MOVL $0, AX // syscall entry
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $-1, AX
|
|
MOVL AX, ret+24(FP)
|
|
RET
|
|
|
|
TEXT runtime·getrlimit(SB),NOSPLIT,$0-20
|
|
MOVL kind+0(FP), DI
|
|
MOVQ limit+8(FP), SI
|
|
MOVL $97, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+16(FP)
|
|
RET
|
|
|
|
TEXT runtime·usleep(SB),NOSPLIT,$16
|
|
MOVL $0, DX
|
|
MOVL usec+0(FP), AX
|
|
MOVL $1000000, CX
|
|
DIVL CX
|
|
MOVQ AX, 0(SP)
|
|
MOVQ DX, 8(SP)
|
|
|
|
// select(0, 0, 0, 0, &tv)
|
|
MOVL $0, DI
|
|
MOVL $0, SI
|
|
MOVL $0, DX
|
|
MOVL $0, R10
|
|
MOVQ SP, R8
|
|
MOVL $23, AX
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·gettid(SB),NOSPLIT,$0-4
|
|
MOVL $186, AX // syscall - gettid
|
|
SYSCALL
|
|
MOVL AX, ret+0(FP)
|
|
RET
|
|
|
|
TEXT runtime·raise(SB),NOSPLIT,$0
|
|
MOVL $186, AX // syscall - gettid
|
|
SYSCALL
|
|
MOVL AX, DI // arg 1 tid
|
|
MOVL sig+0(FP), SI // arg 2
|
|
MOVL $200, AX // syscall - tkill
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·raiseproc(SB),NOSPLIT,$0
|
|
MOVL $39, AX // syscall - getpid
|
|
SYSCALL
|
|
MOVL AX, DI // arg 1 pid
|
|
MOVL sig+0(FP), SI // arg 2
|
|
MOVL $62, AX // syscall - kill
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·setitimer(SB),NOSPLIT,$0-24
|
|
MOVL mode+0(FP), DI
|
|
MOVQ new+8(FP), SI
|
|
MOVQ old+16(FP), DX
|
|
MOVL $38, AX // syscall entry
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·mincore(SB),NOSPLIT,$0-28
|
|
MOVQ addr+0(FP), DI
|
|
MOVQ n+8(FP), SI
|
|
MOVQ dst+16(FP), DX
|
|
MOVL $27, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+24(FP)
|
|
RET
|
|
|
|
// func now() (sec int64, nsec int32)
|
|
TEXT time·now(SB),NOSPLIT,$16
|
|
// Be careful. We're calling a function with gcc calling convention here.
|
|
// We're guaranteed 128 bytes on entry, and we've taken 16, and the
|
|
// call uses another 8.
|
|
// That leaves 104 for the gettime code to use. Hope that's enough!
|
|
MOVQ runtime·__vdso_clock_gettime_sym(SB), AX
|
|
CMPQ AX, $0
|
|
JEQ fallback
|
|
MOVL $0, DI // CLOCK_REALTIME
|
|
LEAQ 0(SP), SI
|
|
CALL AX
|
|
MOVQ 0(SP), AX // sec
|
|
MOVQ 8(SP), DX // nsec
|
|
MOVQ AX, sec+0(FP)
|
|
MOVL DX, nsec+8(FP)
|
|
RET
|
|
fallback:
|
|
LEAQ 0(SP), DI
|
|
MOVQ $0, SI
|
|
MOVQ runtime·__vdso_gettimeofday_sym(SB), AX
|
|
CALL AX
|
|
MOVQ 0(SP), AX // sec
|
|
MOVL 8(SP), DX // usec
|
|
IMULQ $1000, DX
|
|
MOVQ AX, sec+0(FP)
|
|
MOVL DX, nsec+8(FP)
|
|
RET
|
|
|
|
TEXT runtime·nanotime(SB),NOSPLIT,$16
|
|
// Duplicate time.now here to avoid using up precious stack space.
|
|
// See comment above in time.now.
|
|
MOVQ runtime·__vdso_clock_gettime_sym(SB), AX
|
|
CMPQ AX, $0
|
|
JEQ fallback
|
|
MOVL $1, DI // CLOCK_MONOTONIC
|
|
LEAQ 0(SP), SI
|
|
CALL AX
|
|
MOVQ 0(SP), AX // sec
|
|
MOVQ 8(SP), DX // nsec
|
|
// sec is in AX, nsec in DX
|
|
// return nsec in AX
|
|
IMULQ $1000000000, AX
|
|
ADDQ DX, AX
|
|
MOVQ AX, ret+0(FP)
|
|
RET
|
|
fallback:
|
|
LEAQ 0(SP), DI
|
|
MOVQ $0, SI
|
|
MOVQ runtime·__vdso_gettimeofday_sym(SB), AX
|
|
CALL AX
|
|
MOVQ 0(SP), AX // sec
|
|
MOVL 8(SP), DX // usec
|
|
IMULQ $1000, DX
|
|
// sec is in AX, nsec in DX
|
|
// return nsec in AX
|
|
IMULQ $1000000000, AX
|
|
ADDQ DX, AX
|
|
MOVQ AX, ret+0(FP)
|
|
RET
|
|
|
|
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-28
|
|
MOVL sig+0(FP), DI
|
|
MOVQ new+8(FP), SI
|
|
MOVQ old+16(FP), DX
|
|
MOVL size+24(FP), R10
|
|
MOVL $14, AX // syscall entry
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $0xf1, 0xf1 // crash
|
|
RET
|
|
|
|
TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-36
|
|
MOVQ sig+0(FP), DI
|
|
MOVQ new+8(FP), SI
|
|
MOVQ old+16(FP), DX
|
|
MOVQ size+24(FP), R10
|
|
MOVL $13, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+32(FP)
|
|
RET
|
|
|
|
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
|
|
MOVL sig+8(FP), DI
|
|
MOVQ info+16(FP), SI
|
|
MOVQ ctx+24(FP), DX
|
|
MOVQ fn+0(FP), AX
|
|
CALL AX
|
|
RET
|
|
|
|
TEXT runtime·sigtramp(SB),NOSPLIT,$24
|
|
MOVQ DI, 0(SP) // signum
|
|
MOVQ SI, 8(SP) // info
|
|
MOVQ DX, 16(SP) // ctx
|
|
MOVQ $runtime·sigtrampgo(SB), AX
|
|
CALL AX
|
|
RET
|
|
|
|
TEXT runtime·sigreturn(SB),NOSPLIT,$0
|
|
MOVL $15, AX // rt_sigreturn
|
|
SYSCALL
|
|
INT $3 // not reached
|
|
|
|
TEXT runtime·mmap(SB),NOSPLIT,$0
|
|
MOVQ addr+0(FP), DI
|
|
MOVQ n+8(FP), SI
|
|
MOVL prot+16(FP), DX
|
|
MOVL flags+20(FP), R10
|
|
MOVL fd+24(FP), R8
|
|
MOVL off+28(FP), R9
|
|
|
|
MOVL $9, AX // mmap
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 3(PC)
|
|
NOTQ AX
|
|
INCQ AX
|
|
MOVQ AX, ret+32(FP)
|
|
RET
|
|
|
|
TEXT runtime·munmap(SB),NOSPLIT,$0
|
|
MOVQ addr+0(FP), DI
|
|
MOVQ n+8(FP), SI
|
|
MOVQ $11, AX // munmap
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $0xf1, 0xf1 // crash
|
|
RET
|
|
|
|
TEXT runtime·madvise(SB),NOSPLIT,$0
|
|
MOVQ addr+0(FP), DI
|
|
MOVQ n+8(FP), SI
|
|
MOVL flags+16(FP), DX
|
|
MOVQ $28, AX // madvise
|
|
SYSCALL
|
|
// ignore failure - maybe pages are locked
|
|
RET
|
|
|
|
// int64 futex(int32 *uaddr, int32 op, int32 val,
|
|
// struct timespec *timeout, int32 *uaddr2, int32 val2);
|
|
TEXT runtime·futex(SB),NOSPLIT,$0
|
|
MOVQ addr+0(FP), DI
|
|
MOVL op+8(FP), SI
|
|
MOVL val+12(FP), DX
|
|
MOVQ ts+16(FP), R10
|
|
MOVQ addr2+24(FP), R8
|
|
MOVL val3+32(FP), R9
|
|
MOVL $202, AX
|
|
SYSCALL
|
|
MOVL AX, ret+40(FP)
|
|
RET
|
|
|
|
// int32 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void));
|
|
TEXT runtime·clone(SB),NOSPLIT,$0
|
|
MOVL flags+0(FP), DI
|
|
MOVQ stack+8(FP), SI
|
|
MOVQ $0, DX
|
|
MOVQ $0, R10
|
|
|
|
// Copy mp, gp, fn off parent stack for use by child.
|
|
// Careful: Linux system call clobbers CX and R11.
|
|
MOVQ mp+16(FP), R8
|
|
MOVQ gp+24(FP), R9
|
|
MOVQ fn+32(FP), R12
|
|
|
|
MOVL $56, AX
|
|
SYSCALL
|
|
|
|
// In parent, return.
|
|
CMPQ AX, $0
|
|
JEQ 3(PC)
|
|
MOVL AX, ret+40(FP)
|
|
RET
|
|
|
|
// In child, on new stack.
|
|
MOVQ SI, SP
|
|
|
|
// If g or m are nil, skip Go-related setup.
|
|
CMPQ R8, $0 // m
|
|
JEQ nog
|
|
CMPQ R9, $0 // g
|
|
JEQ nog
|
|
|
|
// Initialize m->procid to Linux tid
|
|
MOVL $186, AX // gettid
|
|
SYSCALL
|
|
MOVQ AX, m_procid(R8)
|
|
|
|
// Set FS to point at m->tls.
|
|
LEAQ m_tls(R8), DI
|
|
CALL runtime·settls(SB)
|
|
|
|
// In child, set up new stack
|
|
get_tls(CX)
|
|
MOVQ R8, g_m(R9)
|
|
MOVQ R9, g(CX)
|
|
CALL runtime·stackcheck(SB)
|
|
|
|
nog:
|
|
// Call fn
|
|
CALL R12
|
|
|
|
// It shouldn't return. If it does, exit that thread.
|
|
MOVL $111, DI
|
|
MOVL $60, AX
|
|
SYSCALL
|
|
JMP -3(PC) // keep exiting
|
|
|
|
TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
|
|
MOVQ new+8(SP), DI
|
|
MOVQ old+16(SP), SI
|
|
MOVQ $131, AX
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $0xf1, 0xf1 // crash
|
|
RET
|
|
|
|
// set tls base to DI
|
|
TEXT runtime·settls(SB),NOSPLIT,$32
|
|
ADDQ $8, DI // ELF wants to use -8(FS)
|
|
|
|
MOVQ DI, SI
|
|
MOVQ $0x1002, DI // ARCH_SET_FS
|
|
MOVQ $158, AX // arch_prctl
|
|
SYSCALL
|
|
CMPQ AX, $0xfffffffffffff001
|
|
JLS 2(PC)
|
|
MOVL $0xf1, 0xf1 // crash
|
|
RET
|
|
|
|
TEXT runtime·osyield(SB),NOSPLIT,$0
|
|
MOVL $24, AX
|
|
SYSCALL
|
|
RET
|
|
|
|
TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
|
|
MOVQ pid+0(FP), DI
|
|
MOVQ len+8(FP), SI
|
|
MOVQ buf+16(FP), DX
|
|
MOVL $204, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+24(FP)
|
|
RET
|
|
|
|
// int32 runtime·epollcreate(int32 size);
|
|
TEXT runtime·epollcreate(SB),NOSPLIT,$0
|
|
MOVL size+0(FP), DI
|
|
MOVL $213, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+8(FP)
|
|
RET
|
|
|
|
// int32 runtime·epollcreate1(int32 flags);
|
|
TEXT runtime·epollcreate1(SB),NOSPLIT,$0
|
|
MOVL flags+0(FP), DI
|
|
MOVL $291, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+8(FP)
|
|
RET
|
|
|
|
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
|
|
TEXT runtime·epollctl(SB),NOSPLIT,$0
|
|
MOVL epfd+0(FP), DI
|
|
MOVL op+4(FP), SI
|
|
MOVL fd+8(FP), DX
|
|
MOVQ ev+16(FP), R10
|
|
MOVL $233, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+24(FP)
|
|
RET
|
|
|
|
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
|
|
TEXT runtime·epollwait(SB),NOSPLIT,$0
|
|
MOVL epfd+0(FP), DI
|
|
MOVQ ev+8(FP), SI
|
|
MOVL nev+16(FP), DX
|
|
MOVL timeout+20(FP), R10
|
|
MOVL $232, AX // syscall entry
|
|
SYSCALL
|
|
MOVL AX, ret+24(FP)
|
|
RET
|
|
|
|
// void runtime·closeonexec(int32 fd);
|
|
TEXT runtime·closeonexec(SB),NOSPLIT,$0
|
|
MOVL fd+0(FP), DI // fd
|
|
MOVQ $2, SI // F_SETFD
|
|
MOVQ $1, DX // FD_CLOEXEC
|
|
MOVL $72, AX // fcntl
|
|
SYSCALL
|
|
RET
|