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sys_linux_amd64.s
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sys_linux_amd64.s
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// 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
// Used instead of sigtramp in programs that use cgo.
// Arguments from kernel are in DI, SI, DX.
TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
// If no traceback function, do usual sigtramp.
MOVQ runtime·cgoTraceback(SB), AX
TESTQ AX, AX
JZ sigtramp
// If no traceback support function, which means that
// runtime/cgo was not linked in, do usual sigtramp.
MOVQ _cgo_callers(SB), AX
TESTQ AX, AX
JZ sigtramp
// Figure out if we are currently in a cgo call.
// If not, just do usual sigtramp.
get_tls(CX)
MOVQ g(CX),AX
TESTQ AX, AX
JZ sigtrampnog // g == nil
MOVQ g_m(AX), AX
TESTQ AX, AX
JZ sigtramp // g.m == nil
MOVL m_ncgo(AX), CX
TESTL CX, CX
JZ sigtramp // g.m.ncgo == 0
MOVQ m_curg(AX), CX
TESTQ CX, CX
JZ sigtramp // g.m.curg == nil
MOVQ g_syscallsp(CX), CX
TESTQ CX, CX
JZ sigtramp // g.m.curg.syscallsp == 0
MOVQ m_cgoCallers(AX), R8
TESTQ R8, R8
JZ sigtramp // g.m.cgoCallers == nil
MOVL m_cgoCallersUse(AX), CX
TESTL CX, CX
JNZ sigtramp // g.m.cgoCallersUse != 0
// Jump to a function in runtime/cgo.
// That function, written in C, will call the user's traceback
// function with proper unwind info, and will then call back here.
// The first three arguments, and the fifth, are already in registers.
// Set the two remaining arguments now.
MOVQ runtime·cgoTraceback(SB), CX
MOVQ $runtime·sigtramp(SB), R9
MOVQ _cgo_callers(SB), AX
JMP AX
sigtramp:
JMP runtime·sigtramp(SB)
sigtrampnog:
// Signal arrived on a non-Go thread. If this is SIGPROF, get a
// stack trace.
CMPL DI, $27 // 27 == SIGPROF
JNZ sigtramp
// Lock sigprofCallersUse.
MOVL $0, AX
MOVL $1, CX
MOVQ $runtime·sigprofCallersUse(SB), BX
LOCK
CMPXCHGL CX, 0(BX)
JNZ sigtramp // Skip stack trace if already locked.
// Jump to the traceback function in runtime/cgo.
// It will call back to sigprofNonGo, which will ignore the
// arguments passed in registers.
// First three arguments to traceback function are in registers already.
MOVQ runtime·cgoTraceback(SB), CX
MOVQ $runtime·sigprofCallers(SB), R8
MOVQ $runtime·sigprofNonGo(SB), R9
MOVQ _cgo_callers(SB), AX
JMP AX
// For cgo unwinding to work, this function must look precisely like
// the one in glibc. The glibc source code is:
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86_64/sigaction.c
// The code that cares about the precise instructions used is:
// https://gcc.gnu.org/viewcvs/gcc/trunk/libgcc/config/i386/linux-unwind.h?revision=219188&view=markup
TEXT runtime·sigreturn(SB),NOSPLIT,$0
MOVQ $15, AX // rt_sigreturn
SYSCALL
INT $3 // not reached
TEXT runtime·sysMmap(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
// Call the function stored in _cgo_mmap using the GCC calling convention.
// This must be called on the system stack.
TEXT runtime·callCgoMmap(SB),NOSPLIT,$16
MOVQ addr+0(FP), DI
MOVQ n+8(FP), SI
MOVL prot+16(FP), DX
MOVL flags+20(FP), CX
MOVL fd+24(FP), R8
MOVL off+28(FP), R9
MOVQ _cgo_mmap(SB), AX
MOVQ SP, BX
ANDQ $~15, SP // alignment as per amd64 psABI
MOVQ BX, 0(SP)
CALL AX
MOVQ 0(SP), SP
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 *stk, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT,$0
MOVL flags+0(FP), DI
MOVQ stk+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
#ifdef GOOS_android
// Same as in sys_darwin_386.s:/ugliness, different constant.
// DI currently holds m->tls, which must be fs:0x1d0.
// See cgo/gcc_android_amd64.c for the derivation of the constant.
SUBQ $0x1d0, DI // In android, the tls base
#else
ADDQ $8, DI // ELF wants to use -8(FS)
#endif
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
// int access(const char *name, int mode)
TEXT runtime·access(SB),NOSPLIT,$0
MOVQ name+0(FP), DI
MOVL mode+8(FP), SI
MOVL $21, AX // syscall entry
SYSCALL
MOVL AX, ret+16(FP)
RET
// int connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
TEXT runtime·connect(SB),NOSPLIT,$0-28
MOVL fd+0(FP), DI
MOVQ addr+8(FP), SI
MOVL len+16(FP), DX
MOVL $42, AX // syscall entry
SYSCALL
MOVL AX, ret+24(FP)
RET
// int socket(int domain, int type, int protocol)
TEXT runtime·socket(SB),NOSPLIT,$0-20
MOVL domain+0(FP), DI
MOVL typ+4(FP), SI
MOVL prot+8(FP), DX
MOVL $41, AX // syscall entry
SYSCALL
MOVL AX, ret+16(FP)
RET