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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, Darwin
// See http://fxr.watson.org/fxr/source/bsd/kern/syscalls.c?v=xnu-1228
// or /usr/include/sys/syscall.h (on a Mac) for system call numbers.
//
#include "amd64/asm.h"
// Exit the entire program (like C exit)
TEXT exit(SB),7,$0
MOVL 8(SP), DI // arg 1 exit status
MOVL $(0x2000000+1), AX // syscall entry
SYSCALL
CALL notok(SB)
RET
// Exit this OS thread (like pthread_exit, which eventually
// calls __bsdthread_terminate).
TEXT exit1(SB),7,$0
MOVL 8(SP), DI // arg 1 exit status
MOVL $(0x2000000+361), AX // syscall entry
SYSCALL
CALL notok(SB)
RET
TEXT write(SB),7,$0
MOVL 8(SP), DI // arg 1 fd
MOVQ 16(SP), SI // arg 2 buf
MOVL 24(SP), DX // arg 3 count
MOVL $(0x2000000+4), AX // syscall entry
SYSCALL
JCC 2(PC)
CALL notok(SB)
RET
// void gettime(int64 *sec, int32 *usec)
TEXT gettime(SB), 7, $32
MOVQ SP, DI // must be non-nil, unused
MOVQ $0, SI
MOVQ $(0x2000000+116), AX
SYSCALL
MOVQ sec+0(FP), DI
MOVQ AX, (DI)
MOVQ usec+8(FP), DI
MOVL DX, (DI)
RET
TEXT sigaction(SB),7,$0
MOVL 8(SP), DI // arg 1 sig
MOVQ 16(SP), SI // arg 2 act
MOVQ 24(SP), DX // arg 3 oact
MOVQ 24(SP), CX // arg 3 oact
MOVQ 24(SP), R10 // arg 3 oact
MOVL $(0x2000000+46), AX // syscall entry
SYSCALL
JCC 2(PC)
CALL notok(SB)
RET
TEXT sigtramp(SB),7,$40
MOVQ m_gsignal(m), g
MOVL DX, 0(SP)
MOVQ CX, 8(SP)
MOVQ R8, 16(SP)
MOVQ R8, 24(SP) // save ucontext
MOVQ SI, 32(SP) // save infostyle
CALL DI
MOVL $(0x2000000+184), AX // sigreturn(ucontext, infostyle)
MOVQ 24(SP), DI // saved ucontext
MOVQ 32(SP), SI // saved infostyle
SYSCALL
INT $3 // not reached
TEXT ·mmap(SB),7,$0
MOVQ 8(SP), DI // arg 1 addr
MOVQ 16(SP), SI // arg 2 len
MOVL 24(SP), DX // arg 3 prot
MOVL 28(SP), R10 // arg 4 flags
MOVL 32(SP), R8 // arg 5 fid
MOVL 36(SP), R9 // arg 6 offset
MOVL $(0x2000000+197), AX // syscall entry
SYSCALL
JCC 2(PC)
CALL notok(SB)
RET
TEXT notok(SB),7,$0
MOVL $0xf1, BP
MOVQ BP, (BP)
RET
TEXT sigaltstack(SB),7,$0
MOVQ new+8(SP), DI
MOVQ old+16(SP), SI
MOVQ $(0x2000000+53), AX
SYSCALL
JCC 2(PC)
CALL notok(SB)
RET
// void bsdthread_create(void *stk, M *m, G *g, void (*fn)(void))
TEXT bsdthread_create(SB),7,$0
// Set up arguments to bsdthread_create system call.
// The ones in quotes pass through to the thread callback
// uninterpreted, so we can put whatever we want there.
MOVQ fn+32(SP), DI // "func"
MOVQ mm+16(SP), SI // "arg"
MOVQ stk+8(SP), DX // stack
MOVQ gg+24(SP), R10 // "pthread"
// TODO(rsc): why do we get away with 0 flags here but not on 386?
MOVQ $0, R8 // flags
MOVQ $0, R9 // paranoia
MOVQ $(0x2000000+360), AX // bsdthread_create
SYSCALL
JCC 3(PC)
MOVL $-1, AX
RET
MOVL $0, AX
RET
// The thread that bsdthread_create creates starts executing here,
// because we registered this function using bsdthread_register
// at startup.
// DI = "pthread"
// SI = mach thread port
// DX = "func" (= fn)
// CX = "arg" (= m)
// R8 = stack
// R9 = flags (= 0)
// SP = stack - C_64_REDZONE_LEN (= stack - 128)
TEXT bsdthread_start(SB),7,$0
MOVQ R8, SP // empirically, SP is very wrong but R8 is right
MOVQ CX, m
MOVQ m_g0(m), g
CALL stackcheck(SB)
MOVQ SI, m_procid(m) // thread port is m->procid
CALL DX // fn
CALL exit1(SB)
RET
// void bsdthread_register(void)
// registers callbacks for threadstart (see bsdthread_create above
// and wqthread and pthsize (not used). returns 0 on success.
TEXT bsdthread_register(SB),7,$0
MOVQ $bsdthread_start(SB), DI // threadstart
MOVQ $0, SI // wqthread, not used by us
MOVQ $0, DX // pthsize, not used by us
MOVQ $0, R10 // dummy_value [sic]
MOVQ $0, R8 // targetconc_ptr
MOVQ $0, R9 // dispatchqueue_offset
MOVQ $(0x2000000+366), AX // bsdthread_register
SYSCALL
JCC 2(PC)
CALL notok(SB)
RET
// Mach system calls use 0x1000000 instead of the BSD's 0x2000000.
// uint32 mach_msg_trap(void*, uint32, uint32, uint32, uint32, uint32, uint32)
TEXT mach_msg_trap(SB),7,$0
MOVQ 8(SP), DI
MOVL 16(SP), SI
MOVL 20(SP), DX
MOVL 24(SP), R10
MOVL 28(SP), R8
MOVL 32(SP), R9
MOVL 36(SP), R11
PUSHQ R11 // seventh arg, on stack
MOVL $(0x1000000+31), AX // mach_msg_trap
SYSCALL
POPQ R11
RET
TEXT mach_task_self(SB),7,$0
MOVL $(0x1000000+28), AX // task_self_trap
SYSCALL
RET
TEXT mach_thread_self(SB),7,$0
MOVL $(0x1000000+27), AX // thread_self_trap
SYSCALL
RET
TEXT mach_reply_port(SB),7,$0
MOVL $(0x1000000+26), AX // mach_reply_port
SYSCALL
RET
// Mach provides trap versions of the semaphore ops,
// instead of requiring the use of RPC.
// uint32 mach_semaphore_wait(uint32)
TEXT mach_semaphore_wait(SB),7,$0
MOVL 8(SP), DI
MOVL $(0x1000000+36), AX // semaphore_wait_trap
SYSCALL
RET
// uint32 mach_semaphore_timedwait(uint32, uint32, uint32)
TEXT mach_semaphore_timedwait(SB),7,$0
MOVL 8(SP), DI
MOVL 12(SP), SI
MOVL 16(SP), DX
MOVL $(0x1000000+38), AX // semaphore_timedwait_trap
SYSCALL
RET
// uint32 mach_semaphore_signal(uint32)
TEXT mach_semaphore_signal(SB),7,$0
MOVL 8(SP), DI
MOVL $(0x1000000+33), AX // semaphore_signal_trap
SYSCALL
RET
// uint32 mach_semaphore_signal_all(uint32)
TEXT mach_semaphore_signal_all(SB),7,$0
MOVL 8(SP), DI
MOVL $(0x1000000+34), AX // semaphore_signal_all_trap
SYSCALL
RET
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