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Text file src/runtime/sys_openbsd_386.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 386, 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	$3
    14	
    15	// Exit the entire program (like C exit)
    16	TEXT runtime·exit(SB),NOSPLIT,$-4
    17		MOVL	$1, AX
    18		INT	$0x80
    19		MOVL	$0xf1, 0xf1		// crash
    20		RET
    21	
    22	TEXT runtime·exit1(SB),NOSPLIT,$8
    23		MOVL	$0, 0(SP)
    24		MOVL	$0, 4(SP)		// arg 1 - notdead
    25		MOVL	$302, AX		// sys___threxit
    26		INT	$0x80
    27		JAE	2(PC)
    28		MOVL	$0xf1, 0xf1		// crash
    29		RET
    30	
    31	TEXT runtime·open(SB),NOSPLIT,$-4
    32		MOVL	$5, AX
    33		INT	$0x80
    34		JAE	2(PC)
    35		MOVL	$-1, AX
    36		MOVL	AX, ret+12(FP)
    37		RET
    38	
    39	TEXT runtime·closefd(SB),NOSPLIT,$-4
    40		MOVL	$6, AX
    41		INT	$0x80
    42		JAE	2(PC)
    43		MOVL	$-1, AX
    44		MOVL	AX, ret+4(FP)
    45		RET
    46	
    47	TEXT runtime·read(SB),NOSPLIT,$-4
    48		MOVL	$3, AX
    49		INT	$0x80
    50		JAE	2(PC)
    51		MOVL	$-1, AX
    52		MOVL	AX, ret+12(FP)
    53		RET
    54	
    55	TEXT runtime·write(SB),NOSPLIT,$-4
    56		MOVL	$4, AX			// sys_write
    57		INT	$0x80
    58		JAE	2(PC)
    59		MOVL	$-1, AX
    60		MOVL	AX, ret+12(FP)
    61		RET
    62	
    63	TEXT runtime·usleep(SB),NOSPLIT,$24
    64		MOVL	$0, DX
    65		MOVL	usec+0(FP), AX
    66		MOVL	$1000000, CX
    67		DIVL	CX
    68		MOVL	AX, 12(SP)		// tv_sec - l32
    69		MOVL	$0, 16(SP)		// tv_sec - h32
    70		MOVL	$1000, AX
    71		MULL	DX
    72		MOVL	AX, 20(SP)		// tv_nsec
    73	
    74		MOVL	$0, 0(SP)
    75		LEAL	12(SP), AX
    76		MOVL	AX, 4(SP)		// arg 1 - rqtp
    77		MOVL	$0, 8(SP)		// arg 2 - rmtp
    78		MOVL	$91, AX			// sys_nanosleep
    79		INT	$0x80
    80		RET
    81	
    82	TEXT runtime·raise(SB),NOSPLIT,$16
    83		MOVL	$299, AX		// sys_getthrid
    84		INT	$0x80
    85		MOVL	$0, 0(SP)
    86		MOVL	AX, 4(SP)		// arg 1 - tid
    87		MOVL	sig+0(FP), AX
    88		MOVL	AX, 8(SP)		// arg 2 - signum
    89		MOVL	$0, 12(SP)		// arg 3 - tcb
    90		MOVL	$119, AX		// sys_thrkill
    91		INT	$0x80
    92		RET
    93	
    94	TEXT runtime·raiseproc(SB),NOSPLIT,$12
    95		MOVL	$20, AX			// sys_getpid
    96		INT	$0x80
    97		MOVL	$0, 0(SP)
    98		MOVL	AX, 4(SP)		// arg 1 - pid
    99		MOVL	sig+0(FP), AX
   100		MOVL	AX, 8(SP)		// arg 2 - signum
   101		MOVL	$122, AX		// sys_kill
   102		INT	$0x80
   103		RET
   104	
   105	TEXT runtime·mmap(SB),NOSPLIT,$36
   106		LEAL	addr+0(FP), SI
   107		LEAL	4(SP), DI
   108		CLD
   109		MOVSL				// arg 1 - addr
   110		MOVSL				// arg 2 - len
   111		MOVSL				// arg 3 - prot
   112		MOVSL				// arg 4 - flags
   113		MOVSL				// arg 5 - fd
   114		MOVL	$0, AX
   115		STOSL				// arg 6 - pad
   116		MOVSL				// arg 7 - offset
   117		MOVL	$0, AX			// top 32 bits of file offset
   118		STOSL
   119		MOVL	$197, AX		// sys_mmap
   120		INT	$0x80
   121		MOVL	AX, ret+24(FP)
   122		RET
   123	
   124	TEXT runtime·munmap(SB),NOSPLIT,$-4
   125		MOVL	$73, AX			// sys_munmap
   126		INT	$0x80
   127		JAE	2(PC)
   128		MOVL	$0xf1, 0xf1		// crash
   129		RET
   130	
   131	TEXT runtime·madvise(SB),NOSPLIT,$-4
   132		MOVL	$75, AX			// sys_madvise
   133		INT	$0x80
   134		JAE	2(PC)
   135		MOVL	$0xf1, 0xf1		// crash
   136		RET
   137	
   138	TEXT runtime·setitimer(SB),NOSPLIT,$-4
   139		MOVL	$69, AX
   140		INT	$0x80
   141		RET
   142	
   143	// func walltime() (sec int64, nsec int32)
   144	TEXT runtime·walltime(SB), NOSPLIT, $32
   145		LEAL	12(SP), BX
   146		MOVL	$0, 4(SP)		// arg 1 - clock_id
   147		MOVL	BX, 8(SP)		// arg 2 - tp
   148		MOVL	$87, AX			// sys_clock_gettime
   149		INT	$0x80
   150	
   151		MOVL	12(SP), AX		// sec - l32
   152		MOVL	AX, sec_lo+0(FP)
   153		MOVL	16(SP), AX		// sec - h32
   154		MOVL	AX, sec_hi+4(FP)
   155	
   156		MOVL	20(SP), BX		// nsec
   157		MOVL	BX, nsec+8(FP)
   158		RET
   159	
   160	// int64 nanotime(void) so really
   161	// void nanotime(int64 *nsec)
   162	TEXT runtime·nanotime(SB),NOSPLIT,$32
   163		LEAL	12(SP), BX
   164		MOVL	CLOCK_MONOTONIC, 4(SP)	// arg 1 - clock_id
   165		MOVL	BX, 8(SP)		// arg 2 - tp
   166		MOVL	$87, AX			// sys_clock_gettime
   167		INT	$0x80
   168	
   169		MOVL    16(SP), CX		// sec - h32
   170		IMULL   $1000000000, CX
   171	
   172		MOVL    12(SP), AX		// sec - l32
   173		MOVL    $1000000000, BX
   174		MULL    BX			// result in dx:ax
   175	
   176		MOVL	20(SP), BX		// nsec
   177		ADDL	BX, AX
   178		ADCL	CX, DX			// add high bits with carry
   179	
   180		MOVL	AX, ret_lo+0(FP)
   181		MOVL	DX, ret_hi+4(FP)
   182		RET
   183	
   184	TEXT runtime·sigaction(SB),NOSPLIT,$-4
   185		MOVL	$46, AX			// sys_sigaction
   186		INT	$0x80
   187		JAE	2(PC)
   188		MOVL	$0xf1, 0xf1		// crash
   189		RET
   190	
   191	TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$-4
   192		MOVL	$48, AX			// sys_sigprocmask
   193		INT	$0x80
   194		JAE	2(PC)
   195		MOVL	$0xf1, 0xf1		// crash
   196		MOVL	AX, ret+8(FP)
   197		RET
   198	
   199	TEXT runtime·sigfwd(SB),NOSPLIT,$12-16
   200		MOVL	fn+0(FP), AX
   201		MOVL	sig+4(FP), BX
   202		MOVL	info+8(FP), CX
   203		MOVL	ctx+12(FP), DX
   204		MOVL	SP, SI
   205		SUBL	$32, SP
   206		ANDL	$~15, SP	// align stack: handler might be a C function
   207		MOVL	BX, 0(SP)
   208		MOVL	CX, 4(SP)
   209		MOVL	DX, 8(SP)
   210		MOVL	SI, 12(SP)	// save SI: handler might be a Go function
   211		CALL	AX
   212		MOVL	12(SP), AX
   213		MOVL	AX, SP
   214		RET
   215	
   216	TEXT runtime·sigtramp(SB),NOSPLIT,$28
   217		// Save callee-saved C registers, since the caller may be a C signal handler.
   218		MOVL	BX, bx-4(SP)
   219		MOVL	BP, bp-8(SP)
   220		MOVL	SI, si-12(SP)
   221		MOVL	DI, di-16(SP)
   222		// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
   223		// modify them.
   224	
   225		MOVL	signo+0(FP), BX
   226		MOVL	BX, 0(SP)
   227		MOVL	info+4(FP), BX
   228		MOVL	BX, 4(SP)
   229		MOVL	context+8(FP), BX
   230		MOVL	BX, 8(SP)
   231		CALL	runtime·sigtrampgo(SB)
   232	
   233		MOVL	di-16(SP), DI
   234		MOVL	si-12(SP), SI
   235		MOVL	bp-8(SP),  BP
   236		MOVL	bx-4(SP),  BX
   237		RET
   238	
   239	// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
   240	TEXT runtime·tfork(SB),NOSPLIT,$12
   241	
   242		// Copy mp, gp and fn from the parent stack onto the child stack.
   243		MOVL	param+0(FP), AX
   244		MOVL	8(AX), CX		// tf_stack
   245		SUBL	$16, CX
   246		MOVL	CX, 8(AX)
   247		MOVL	mm+8(FP), SI
   248		MOVL	SI, 0(CX)
   249		MOVL	gg+12(FP), SI
   250		MOVL	SI, 4(CX)
   251		MOVL	fn+16(FP), SI
   252		MOVL	SI, 8(CX)
   253		MOVL	$1234, 12(CX)
   254	
   255		MOVL	$0, 0(SP)		// syscall gap
   256		MOVL	param+0(FP), AX
   257		MOVL	AX, 4(SP)		// arg 1 - param
   258		MOVL	psize+4(FP), AX
   259		MOVL	AX, 8(SP)		// arg 2 - psize
   260		MOVL	$8, AX			// sys___tfork
   261		INT	$0x80
   262	
   263		// Return if tfork syscall failed.
   264		JCC	4(PC)
   265		NEGL	AX
   266		MOVL	AX, ret+20(FP)
   267		RET
   268	
   269		// In parent, return.
   270		CMPL	AX, $0
   271		JEQ	3(PC)
   272		MOVL	AX, ret+20(FP)
   273		RET
   274	
   275		// Paranoia: check that SP is as we expect.
   276		MOVL	12(SP), BP
   277		CMPL	BP, $1234
   278		JEQ	2(PC)
   279		INT	$3
   280	
   281		// Reload registers.
   282		MOVL	0(SP), BX		// m
   283		MOVL	4(SP), DX		// g
   284		MOVL	8(SP), SI		// fn
   285	
   286		// Set FS to point at m->tls.
   287		LEAL	m_tls(BX), BP
   288		PUSHAL				// save registers
   289		PUSHL	BP
   290		CALL	runtime·settls(SB)
   291		POPL	AX
   292		POPAL
   293		
   294		// Now segment is established. Initialize m, g.
   295		get_tls(AX)
   296		MOVL	DX, g(AX)
   297		MOVL	BX, g_m(DX)
   298	
   299		CALL	runtime·stackcheck(SB)	// smashes AX, CX
   300		MOVL	0(DX), DX		// paranoia; check they are not nil
   301		MOVL	0(BX), BX
   302	
   303		// More paranoia; check that stack splitting code works.
   304		PUSHAL
   305		CALL	runtime·emptyfunc(SB)
   306		POPAL
   307	
   308		// Call fn.
   309		CALL	SI
   310	
   311		CALL	runtime·exit1(SB)
   312		MOVL	$0x1234, 0x1005
   313		RET
   314	
   315	TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
   316		MOVL	$288, AX		// sys_sigaltstack
   317		MOVL	new+0(FP), BX
   318		MOVL	old+4(FP), CX
   319		INT	$0x80
   320		CMPL	AX, $0xfffff001
   321		JLS	2(PC)
   322		INT	$3
   323		RET
   324	
   325	TEXT runtime·setldt(SB),NOSPLIT,$4
   326		// Under OpenBSD we set the GS base instead of messing with the LDT.
   327		MOVL	tls0+4(FP), AX
   328		MOVL	AX, 0(SP)
   329		CALL	runtime·settls(SB)
   330		RET
   331	
   332	TEXT runtime·settls(SB),NOSPLIT,$8
   333		// adjust for ELF: wants to use -4(GS) for g
   334		MOVL	tlsbase+0(FP), CX
   335		ADDL	$4, CX
   336		MOVL	$0, 0(SP)		// syscall gap
   337		MOVL	CX, 4(SP)		// arg 1 - tcb
   338		MOVL	$329, AX		// sys___set_tcb
   339		INT	$0x80
   340		JCC	2(PC)
   341		MOVL	$0xf1, 0xf1		// crash
   342		RET
   343	
   344	TEXT runtime·osyield(SB),NOSPLIT,$-4
   345		MOVL	$298, AX		// sys_sched_yield
   346		INT	$0x80
   347		RET
   348	
   349	TEXT runtime·thrsleep(SB),NOSPLIT,$-4
   350		MOVL	$94, AX			// sys___thrsleep
   351		INT	$0x80
   352		MOVL	AX, ret+20(FP)
   353		RET
   354	
   355	TEXT runtime·thrwakeup(SB),NOSPLIT,$-4
   356		MOVL	$301, AX		// sys___thrwakeup
   357		INT	$0x80
   358		MOVL	AX, ret+8(FP)
   359		RET
   360	
   361	TEXT runtime·sysctl(SB),NOSPLIT,$28
   362		LEAL	mib+0(FP), SI
   363		LEAL	4(SP), DI
   364		CLD
   365		MOVSL				// arg 1 - name
   366		MOVSL				// arg 2 - namelen
   367		MOVSL				// arg 3 - oldp
   368		MOVSL				// arg 4 - oldlenp
   369		MOVSL				// arg 5 - newp
   370		MOVSL				// arg 6 - newlen
   371		MOVL	$202, AX		// sys___sysctl
   372		INT	$0x80
   373		JCC	4(PC)
   374		NEGL	AX
   375		MOVL	AX, ret+24(FP)
   376		RET
   377		MOVL	$0, AX
   378		MOVL	AX, ret+24(FP)
   379		RET
   380	
   381	// int32 runtime·kqueue(void);
   382	TEXT runtime·kqueue(SB),NOSPLIT,$0
   383		MOVL	$269, AX
   384		INT	$0x80
   385		JAE	2(PC)
   386		NEGL	AX
   387		MOVL	AX, ret+0(FP)
   388		RET
   389	
   390	// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
   391	TEXT runtime·kevent(SB),NOSPLIT,$0
   392		MOVL	$72, AX			// sys_kevent
   393		INT	$0x80
   394		JAE	2(PC)
   395		NEGL	AX
   396		MOVL	AX, ret+24(FP)
   397		RET
   398	
   399	// int32 runtime·closeonexec(int32 fd);
   400	TEXT runtime·closeonexec(SB),NOSPLIT,$32
   401		MOVL	$92, AX			// sys_fcntl
   402		// 0(SP) is where the caller PC would be; kernel skips it
   403		MOVL	fd+0(FP), BX
   404		MOVL	BX, 4(SP)	// fd
   405		MOVL	$2, 8(SP)	// F_SETFD
   406		MOVL	$1, 12(SP)	// FD_CLOEXEC
   407		INT	$0x80
   408		JAE	2(PC)
   409		NEGL	AX
   410		RET
   411	
   412	GLOBL runtime·tlsoffset(SB),NOPTR,$4

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