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Text file src/runtime/sys_openbsd_amd64.s

Documentation: runtime

     1	// Copyright 2009 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	//
     5	// System calls and other sys.stuff for AMD64, OpenBSD
     6	// /usr/src/sys/kern/syscalls.master for syscall numbers.
     7	//
     8	
     9	#include "go_asm.h"
    10	#include "go_tls.h"
    11	#include "textflag.h"
    12	
    13	#define CLOCK_MONOTONIC	$3
    14	
    15	// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
    16	TEXT runtime·tfork(SB),NOSPLIT,$32
    17	
    18		// Copy mp, gp and fn off parent stack for use by child.
    19		MOVQ	mm+16(FP), R8
    20		MOVQ	gg+24(FP), R9
    21		MOVQ	fn+32(FP), R12
    22	
    23		MOVQ	param+0(FP), DI
    24		MOVQ	psize+8(FP), SI
    25		MOVL	$8, AX			// sys___tfork
    26		SYSCALL
    27	
    28		// Return if tfork syscall failed.
    29		JCC	4(PC)
    30		NEGQ	AX
    31		MOVL	AX, ret+40(FP)
    32		RET
    33	
    34		// In parent, return.
    35		CMPL	AX, $0
    36		JEQ	3(PC)
    37		MOVL	AX, ret+40(FP)
    38		RET
    39	
    40		// Set FS to point at m->tls.
    41		LEAQ	m_tls(R8), DI
    42		CALL	runtime·settls(SB)
    43	
    44		// In child, set up new stack.
    45		get_tls(CX)
    46		MOVQ	R8, g_m(R9)
    47		MOVQ	R9, g(CX)
    48		CALL	runtime·stackcheck(SB)
    49	
    50		// Call fn
    51		CALL	R12
    52	
    53		// It shouldn't return. If it does, exit
    54		MOVQ	$0, DI			// arg 1 - notdead
    55		MOVL	$302, AX		// sys___threxit
    56		SYSCALL
    57		JMP	-3(PC)			// keep exiting
    58	
    59	TEXT runtime·osyield(SB),NOSPLIT,$0
    60		MOVL	$298, AX		// sys_sched_yield
    61		SYSCALL
    62		RET
    63	
    64	TEXT runtime·thrsleep(SB),NOSPLIT,$0
    65		MOVQ	ident+0(FP), DI		// arg 1 - ident
    66		MOVL	clock_id+8(FP), SI		// arg 2 - clock_id
    67		MOVQ	tsp+16(FP), DX		// arg 3 - tp
    68		MOVQ	lock+24(FP), R10		// arg 4 - lock
    69		MOVQ	abort+32(FP), R8		// arg 5 - abort
    70		MOVL	$94, AX			// sys___thrsleep
    71		SYSCALL
    72		MOVL	AX, ret+40(FP)
    73		RET
    74	
    75	TEXT runtime·thrwakeup(SB),NOSPLIT,$0
    76		MOVQ	ident+0(FP), DI		// arg 1 - ident
    77		MOVL	n+8(FP), SI		// arg 2 - n
    78		MOVL	$301, AX		// sys___thrwakeup
    79		SYSCALL
    80		MOVL	AX, ret+16(FP)
    81		RET
    82	
    83	// Exit the entire program (like C exit)
    84	TEXT runtime·exit(SB),NOSPLIT,$-8
    85		MOVL	code+0(FP), DI		// arg 1 - exit status
    86		MOVL	$1, AX			// sys_exit
    87		SYSCALL
    88		MOVL	$0xf1, 0xf1		// crash
    89		RET
    90	
    91	TEXT runtime·exit1(SB),NOSPLIT,$-8
    92		MOVQ	$0, DI			// arg 1 - notdead
    93		MOVL	$302, AX		// sys___threxit
    94		SYSCALL
    95		MOVL	$0xf1, 0xf1		// crash
    96		RET
    97	
    98	TEXT runtime·open(SB),NOSPLIT,$-8
    99		MOVQ	name+0(FP), DI		// arg 1 pathname
   100		MOVL	mode+8(FP), SI		// arg 2 flags
   101		MOVL	perm+12(FP), DX		// arg 3 mode
   102		MOVL	$5, AX
   103		SYSCALL
   104		JCC	2(PC)
   105		MOVL	$-1, AX
   106		MOVL	AX, ret+16(FP)
   107		RET
   108	
   109	TEXT runtime·closefd(SB),NOSPLIT,$-8
   110		MOVL	fd+0(FP), DI		// arg 1 fd
   111		MOVL	$6, AX
   112		SYSCALL
   113		JCC	2(PC)
   114		MOVL	$-1, AX
   115		MOVL	AX, ret+8(FP)
   116		RET
   117	
   118	TEXT runtime·read(SB),NOSPLIT,$-8
   119		MOVL	fd+0(FP), DI		// arg 1 fd
   120		MOVQ	p+8(FP), SI		// arg 2 buf
   121		MOVL	n+16(FP), DX		// arg 3 count
   122		MOVL	$3, AX
   123		SYSCALL
   124		JCC	2(PC)
   125		MOVL	$-1, AX
   126		MOVL	AX, ret+24(FP)
   127		RET
   128	
   129	TEXT runtime·write(SB),NOSPLIT,$-8
   130		MOVQ	fd+0(FP), DI		// arg 1 - fd
   131		MOVQ	p+8(FP), SI		// arg 2 - buf
   132		MOVL	n+16(FP), DX		// arg 3 - nbyte
   133		MOVL	$4, AX			// sys_write
   134		SYSCALL
   135		JCC	2(PC)
   136		MOVL	$-1, AX
   137		MOVL	AX, ret+24(FP)
   138		RET
   139	
   140	TEXT runtime·usleep(SB),NOSPLIT,$16
   141		MOVL	$0, DX
   142		MOVL	usec+0(FP), AX
   143		MOVL	$1000000, CX
   144		DIVL	CX
   145		MOVQ	AX, 0(SP)		// tv_sec
   146		MOVL	$1000, AX
   147		MULL	DX
   148		MOVQ	AX, 8(SP)		// tv_nsec
   149	
   150		MOVQ	SP, DI			// arg 1 - rqtp
   151		MOVQ	$0, SI			// arg 2 - rmtp
   152		MOVL	$91, AX			// sys_nanosleep
   153		SYSCALL
   154		RET
   155	
   156	TEXT runtime·raise(SB),NOSPLIT,$16
   157		MOVL	$299, AX		// sys_getthrid
   158		SYSCALL
   159		MOVQ	AX, DI			// arg 1 - tid
   160		MOVL	sig+0(FP), SI		// arg 2 - signum
   161		MOVQ	$0, DX			// arg 3 - tcb
   162		MOVL	$119, AX		// sys_thrkill
   163		SYSCALL
   164		RET
   165	
   166	TEXT runtime·raiseproc(SB),NOSPLIT,$16
   167		MOVL	$20, AX			// sys_getpid
   168		SYSCALL
   169		MOVQ	AX, DI			// arg 1 - pid
   170		MOVL	sig+0(FP), SI		// arg 2 - signum
   171		MOVL	$122, AX		// sys_kill
   172		SYSCALL
   173		RET
   174	
   175	TEXT runtime·setitimer(SB),NOSPLIT,$-8
   176		MOVL	mode+0(FP), DI		// arg 1 - which
   177		MOVQ	new+8(FP), SI		// arg 2 - itv
   178		MOVQ	old+16(FP), DX		// arg 3 - oitv
   179		MOVL	$69, AX			// sys_setitimer
   180		SYSCALL
   181		RET
   182	
   183	// func walltime() (sec int64, nsec int32)
   184	TEXT runtime·walltime(SB), NOSPLIT, $32
   185		MOVQ	$0, DI			// arg 1 - clock_id
   186		LEAQ	8(SP), SI		// arg 2 - tp
   187		MOVL	$87, AX			// sys_clock_gettime
   188		SYSCALL
   189		MOVQ	8(SP), AX		// sec
   190		MOVQ	16(SP), DX		// nsec
   191	
   192		// sec is in AX, nsec in DX
   193		MOVQ	AX, sec+0(FP)
   194		MOVL	DX, nsec+8(FP)
   195		RET
   196	
   197	TEXT runtime·nanotime(SB),NOSPLIT,$24
   198		MOVQ	CLOCK_MONOTONIC, DI	// arg 1 - clock_id
   199		LEAQ	8(SP), SI		// arg 2 - tp
   200		MOVL	$87, AX			// sys_clock_gettime
   201		SYSCALL
   202		MOVQ	8(SP), AX		// sec
   203		MOVQ	16(SP), DX		// nsec
   204	
   205		// sec is in AX, nsec in DX
   206		// return nsec in AX
   207		IMULQ	$1000000000, AX
   208		ADDQ	DX, AX
   209		MOVQ	AX, ret+0(FP)
   210		RET
   211	
   212	TEXT runtime·sigaction(SB),NOSPLIT,$-8
   213		MOVL	sig+0(FP), DI		// arg 1 - signum
   214		MOVQ	new+8(FP), SI		// arg 2 - nsa
   215		MOVQ	old+16(FP), DX		// arg 3 - osa
   216		MOVL	$46, AX
   217		SYSCALL
   218		JCC	2(PC)
   219		MOVL	$0xf1, 0xf1		// crash
   220		RET
   221	
   222	TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
   223		MOVL	how+0(FP), DI		// arg 1 - how
   224		MOVL	new+4(FP), SI		// arg 2 - set
   225		MOVL	$48, AX			// sys_sigprocmask
   226		SYSCALL
   227		JCC	2(PC)
   228		MOVL	$0xf1, 0xf1		// crash
   229		MOVL	AX, ret+8(FP)
   230		RET
   231	
   232	TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
   233		MOVQ	fn+0(FP),    AX
   234		MOVL	sig+8(FP),   DI
   235		MOVQ	info+16(FP), SI
   236		MOVQ	ctx+24(FP),  DX
   237		PUSHQ	BP
   238		MOVQ	SP, BP
   239		ANDQ	$~15, SP     // alignment for x86_64 ABI
   240		CALL	AX
   241		MOVQ	BP, SP
   242		POPQ	BP
   243		RET
   244	
   245	TEXT runtime·sigtramp(SB),NOSPLIT,$72
   246		// Save callee-saved C registers, since the caller may be a C signal handler.
   247		MOVQ	BX,  bx-8(SP)
   248		MOVQ	BP,  bp-16(SP)  // save in case GOEXPERIMENT=noframepointer is set
   249		MOVQ	R12, r12-24(SP)
   250		MOVQ	R13, r13-32(SP)
   251		MOVQ	R14, r14-40(SP)
   252		MOVQ	R15, r15-48(SP)
   253		// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
   254		// modify them.
   255	
   256		MOVQ	DX, ctx-56(SP)
   257		MOVQ	SI, info-64(SP)
   258		MOVQ	DI, signum-72(SP)
   259		CALL	runtime·sigtrampgo(SB)
   260	
   261		MOVQ	r15-48(SP), R15
   262		MOVQ	r14-40(SP), R14
   263		MOVQ	r13-32(SP), R13
   264		MOVQ	r12-24(SP), R12
   265		MOVQ	bp-16(SP),  BP
   266		MOVQ	bx-8(SP),   BX
   267		RET
   268	
   269	TEXT runtime·mmap(SB),NOSPLIT,$0
   270		MOVQ	addr+0(FP), DI		// arg 1 - addr
   271		MOVQ	n+8(FP), SI		// arg 2 - len
   272		MOVL	prot+16(FP), DX		// arg 3 - prot
   273		MOVL	flags+20(FP), R10		// arg 4 - flags
   274		MOVL	fd+24(FP), R8		// arg 5 - fd
   275		MOVL	off+28(FP), R9
   276		SUBQ	$16, SP
   277		MOVQ	R9, 8(SP)		// arg 7 - offset (passed on stack)
   278		MOVQ	$0, R9			// arg 6 - pad
   279		MOVL	$197, AX
   280		SYSCALL
   281		ADDQ	$16, SP
   282		MOVQ	AX, ret+32(FP)
   283		RET
   284	
   285	TEXT runtime·munmap(SB),NOSPLIT,$0
   286		MOVQ	addr+0(FP), DI		// arg 1 - addr
   287		MOVQ	n+8(FP), SI		// arg 2 - len
   288		MOVL	$73, AX			// sys_munmap
   289		SYSCALL
   290		JCC	2(PC)
   291		MOVL	$0xf1, 0xf1		// crash
   292		RET
   293	
   294	TEXT runtime·madvise(SB),NOSPLIT,$0
   295		MOVQ	addr+0(FP), DI		// arg 1 - addr
   296		MOVQ	n+8(FP), SI		// arg 2 - len
   297		MOVL	flags+16(FP), DX	// arg 3 - behav
   298		MOVQ	$75, AX			// sys_madvise
   299		SYSCALL
   300		// ignore failure - maybe pages are locked
   301		RET
   302	
   303	TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
   304		MOVQ	new+0(FP), DI		// arg 1 - nss
   305		MOVQ	old+8(FP), SI		// arg 2 - oss
   306		MOVQ	$288, AX		// sys_sigaltstack
   307		SYSCALL
   308		JCC	2(PC)
   309		MOVL	$0xf1, 0xf1		// crash
   310		RET
   311	
   312	// set tls base to DI
   313	TEXT runtime·settls(SB),NOSPLIT,$0
   314		// adjust for ELF: wants to use -8(FS) for g
   315		ADDQ	$8, DI
   316		MOVQ	$329, AX		// sys___settcb
   317		SYSCALL
   318		JCC	2(PC)
   319		MOVL	$0xf1, 0xf1		// crash
   320		RET
   321	
   322	TEXT runtime·sysctl(SB),NOSPLIT,$0
   323		MOVQ	mib+0(FP), DI		// arg 1 - name
   324		MOVL	miblen+8(FP), SI		// arg 2 - namelen
   325		MOVQ	out+16(FP), DX		// arg 3 - oldp
   326		MOVQ	size+24(FP), R10		// arg 4 - oldlenp
   327		MOVQ	dst+32(FP), R8		// arg 5 - newp
   328		MOVQ	ndst+40(FP), R9		// arg 6 - newlen
   329		MOVQ	$202, AX		// sys___sysctl
   330		SYSCALL
   331		JCC	4(PC)
   332		NEGQ	AX
   333		MOVL	AX, ret+48(FP)
   334		RET
   335		MOVL	$0, AX
   336		MOVL	AX, ret+48(FP)
   337		RET
   338	
   339	// int32 runtime·kqueue(void);
   340	TEXT runtime·kqueue(SB),NOSPLIT,$0
   341		MOVQ	$0, DI
   342		MOVQ	$0, SI
   343		MOVQ	$0, DX
   344		MOVL	$269, AX
   345		SYSCALL
   346		JCC	2(PC)
   347		NEGQ	AX
   348		MOVL	AX, ret+0(FP)
   349		RET
   350	
   351	// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
   352	TEXT runtime·kevent(SB),NOSPLIT,$0
   353		MOVL	kq+0(FP), DI
   354		MOVQ	ch+8(FP), SI
   355		MOVL	nch+16(FP), DX
   356		MOVQ	ev+24(FP), R10
   357		MOVL	nev+32(FP), R8
   358		MOVQ	ts+40(FP), R9
   359		MOVL	$72, AX
   360		SYSCALL
   361		JCC	2(PC)
   362		NEGQ	AX
   363		MOVL	AX, ret+48(FP)
   364		RET
   365	
   366	// void runtime·closeonexec(int32 fd);
   367	TEXT runtime·closeonexec(SB),NOSPLIT,$0
   368		MOVL	fd+0(FP), DI	// fd
   369		MOVQ	$2, SI		// F_SETFD
   370		MOVQ	$1, DX		// FD_CLOEXEC
   371		MOVL	$92, AX		// fcntl
   372		SYSCALL
   373		RET

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