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      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 runtimetfork(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	runtimesettls(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	runtimestackcheck(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 runtimeosyield(SB),NOSPLIT,$0
     60 	MOVL	$298, AX		// sys_sched_yield
     61 	SYSCALL
     62 	RET
     63 
     64 TEXT runtimethrsleep(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 runtimethrwakeup(SB),NOSPLIT,$0
     76 	MOVQ	ident+0(FP), DI		// arg 1 - ident
     77 	MOVL	n+8(FP), SI		// arg 2 - n
     78 	MOVL	$301, AX		// sys___thrwakeup
     79 	SYSCALL
     80 	MOVL	AX, ret+16(FP)
     81 	RET
     82 
     83 // Exit the entire program (like C exit)
     84 TEXT runtimeexit(SB),NOSPLIT,$-8
     85 	MOVL	code+0(FP), DI		// arg 1 - exit status
     86 	MOVL	$1, AX			// sys_exit
     87 	SYSCALL
     88 	MOVL	$0xf1, 0xf1		// crash
     89 	RET
     90 
     91 TEXT runtimeexit1(SB),NOSPLIT,$-8
     92 	MOVQ	$0, DI			// arg 1 - notdead
     93 	MOVL	$302, AX		// sys___threxit
     94 	SYSCALL
     95 	MOVL	$0xf1, 0xf1		// crash
     96 	RET
     97 
     98 TEXT runtimeopen(SB),NOSPLIT,$-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	$-1, AX
    106 	MOVL	AX, ret+16(FP)
    107 	RET
    108 
    109 TEXT runtimeclosefd(SB),NOSPLIT,$-8
    110 	MOVL	fd+0(FP), DI		// arg 1 fd
    111 	MOVL	$6, AX
    112 	SYSCALL
    113 	JCC	2(PC)
    114 	MOVL	$-1, AX
    115 	MOVL	AX, ret+8(FP)
    116 	RET
    117 
    118 TEXT runtimeread(SB),NOSPLIT,$-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	$-1, AX
    126 	MOVL	AX, ret+24(FP)
    127 	RET
    128 
    129 TEXT runtimewrite(SB),NOSPLIT,$-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 runtimeusleep(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 runtimeraise(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 runtimeraiseproc(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	$122, AX		// sys_kill
    172 	SYSCALL
    173 	RET
    174 
    175 TEXT runtimesetitimer(SB),NOSPLIT,$-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 now() (sec int64, nsec int32)
    184 TEXT timenow(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 runtimenanotime(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	$1000000000, AX
    208 	ADDQ	DX, AX
    209 	MOVQ	AX, ret+0(FP)
    210 	RET
    211 
    212 TEXT runtimesigaction(SB),NOSPLIT,$-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 runtimeobsdsigprocmask(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 runtimesigfwd(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 runtimesigtramp(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	runtimesigtrampgo(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 runtimemmap(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 runtimemunmap(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 runtimemadvise(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	$75, AX			// sys_madvise
    299 	SYSCALL
    300 	// ignore failure - maybe pages are locked
    301 	RET
    302 
    303 TEXT runtimesigaltstack(SB),NOSPLIT,$-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 runtimesettls(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 runtimesysctl(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 runtimekqueue(void);
    340 TEXT runtimekqueue(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 runtimekevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
    352 TEXT runtimekevent(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 runtimecloseonexec(int32 fd);
    367 TEXT runtimecloseonexec(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
    374