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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 // func exitThread(wait *uint32)
     92 TEXT runtimeexitThread(SB),NOSPLIT,$0-8
     93 	MOVQ	wait+0(FP), AX
     94 	// We're done using the stack.
     95 	MOVL	$0, (AX)
     96 	MOVQ	$0, DI			// arg 1 - notdead
     97 	MOVL	$302, AX		// sys___threxit
     98 	SYSCALL
     99 	MOVL	$0xf1, 0xf1		// crash
    100 	JMP	0(PC)
    101 
    102 TEXT runtimeopen(SB),NOSPLIT,$-8
    103 	MOVQ	name+0(FP), DI		// arg 1 pathname
    104 	MOVL	mode+8(FP), SI		// arg 2 flags
    105 	MOVL	perm+12(FP), DX		// arg 3 mode
    106 	MOVL	$5, AX
    107 	SYSCALL
    108 	JCC	2(PC)
    109 	MOVL	$-1, AX
    110 	MOVL	AX, ret+16(FP)
    111 	RET
    112 
    113 TEXT runtimeclosefd(SB),NOSPLIT,$-8
    114 	MOVL	fd+0(FP), DI		// arg 1 fd
    115 	MOVL	$6, AX
    116 	SYSCALL
    117 	JCC	2(PC)
    118 	MOVL	$-1, AX
    119 	MOVL	AX, ret+8(FP)
    120 	RET
    121 
    122 TEXT runtimeread(SB),NOSPLIT,$-8
    123 	MOVL	fd+0(FP), DI		// arg 1 fd
    124 	MOVQ	p+8(FP), SI		// arg 2 buf
    125 	MOVL	n+16(FP), DX		// arg 3 count
    126 	MOVL	$3, AX
    127 	SYSCALL
    128 	JCC	2(PC)
    129 	MOVL	$-1, AX
    130 	MOVL	AX, ret+24(FP)
    131 	RET
    132 
    133 TEXT runtimewrite(SB),NOSPLIT,$-8
    134 	MOVQ	fd+0(FP), DI		// arg 1 - fd
    135 	MOVQ	p+8(FP), SI		// arg 2 - buf
    136 	MOVL	n+16(FP), DX		// arg 3 - nbyte
    137 	MOVL	$4, AX			// sys_write
    138 	SYSCALL
    139 	JCC	2(PC)
    140 	MOVL	$-1, AX
    141 	MOVL	AX, ret+24(FP)
    142 	RET
    143 
    144 TEXT runtimeusleep(SB),NOSPLIT,$16
    145 	MOVL	$0, DX
    146 	MOVL	usec+0(FP), AX
    147 	MOVL	$1000000, CX
    148 	DIVL	CX
    149 	MOVQ	AX, 0(SP)		// tv_sec
    150 	MOVL	$1000, AX
    151 	MULL	DX
    152 	MOVQ	AX, 8(SP)		// tv_nsec
    153 
    154 	MOVQ	SP, DI			// arg 1 - rqtp
    155 	MOVQ	$0, SI			// arg 2 - rmtp
    156 	MOVL	$91, AX			// sys_nanosleep
    157 	SYSCALL
    158 	RET
    159 
    160 TEXT runtimeraise(SB),NOSPLIT,$16
    161 	MOVL	$299, AX		// sys_getthrid
    162 	SYSCALL
    163 	MOVQ	AX, DI			// arg 1 - tid
    164 	MOVL	sig+0(FP), SI		// arg 2 - signum
    165 	MOVQ	$0, DX			// arg 3 - tcb
    166 	MOVL	$119, AX		// sys_thrkill
    167 	SYSCALL
    168 	RET
    169 
    170 TEXT runtimeraiseproc(SB),NOSPLIT,$16
    171 	MOVL	$20, AX			// sys_getpid
    172 	SYSCALL
    173 	MOVQ	AX, DI			// arg 1 - pid
    174 	MOVL	sig+0(FP), SI		// arg 2 - signum
    175 	MOVL	$122, AX		// sys_kill
    176 	SYSCALL
    177 	RET
    178 
    179 TEXT runtimesetitimer(SB),NOSPLIT,$-8
    180 	MOVL	mode+0(FP), DI		// arg 1 - which
    181 	MOVQ	new+8(FP), SI		// arg 2 - itv
    182 	MOVQ	old+16(FP), DX		// arg 3 - oitv
    183 	MOVL	$69, AX			// sys_setitimer
    184 	SYSCALL
    185 	RET
    186 
    187 // func walltime() (sec int64, nsec int32)
    188 TEXT runtimewalltime(SB), NOSPLIT, $32
    189 	MOVQ	$0, DI			// arg 1 - clock_id
    190 	LEAQ	8(SP), SI		// arg 2 - tp
    191 	MOVL	$87, AX			// sys_clock_gettime
    192 	SYSCALL
    193 	MOVQ	8(SP), AX		// sec
    194 	MOVQ	16(SP), DX		// nsec
    195 
    196 	// sec is in AX, nsec in DX
    197 	MOVQ	AX, sec+0(FP)
    198 	MOVL	DX, nsec+8(FP)
    199 	RET
    200 
    201 TEXT runtimenanotime(SB),NOSPLIT,$24
    202 	MOVQ	CLOCK_MONOTONIC, DI	// arg 1 - clock_id
    203 	LEAQ	8(SP), SI		// arg 2 - tp
    204 	MOVL	$87, AX			// sys_clock_gettime
    205 	SYSCALL
    206 	MOVQ	8(SP), AX		// sec
    207 	MOVQ	16(SP), DX		// nsec
    208 
    209 	// sec is in AX, nsec in DX
    210 	// return nsec in AX
    211 	IMULQ	$1000000000, AX
    212 	ADDQ	DX, AX
    213 	MOVQ	AX, ret+0(FP)
    214 	RET
    215 
    216 TEXT runtimesigaction(SB),NOSPLIT,$-8
    217 	MOVL	sig+0(FP), DI		// arg 1 - signum
    218 	MOVQ	new+8(FP), SI		// arg 2 - nsa
    219 	MOVQ	old+16(FP), DX		// arg 3 - osa
    220 	MOVL	$46, AX
    221 	SYSCALL
    222 	JCC	2(PC)
    223 	MOVL	$0xf1, 0xf1		// crash
    224 	RET
    225 
    226 TEXT runtimeobsdsigprocmask(SB),NOSPLIT,$0
    227 	MOVL	how+0(FP), DI		// arg 1 - how
    228 	MOVL	new+4(FP), SI		// arg 2 - set
    229 	MOVL	$48, AX			// sys_sigprocmask
    230 	SYSCALL
    231 	JCC	2(PC)
    232 	MOVL	$0xf1, 0xf1		// crash
    233 	MOVL	AX, ret+8(FP)
    234 	RET
    235 
    236 TEXT runtimesigfwd(SB),NOSPLIT,$0-32
    237 	MOVQ	fn+0(FP),    AX
    238 	MOVL	sig+8(FP),   DI
    239 	MOVQ	info+16(FP), SI
    240 	MOVQ	ctx+24(FP),  DX
    241 	PUSHQ	BP
    242 	MOVQ	SP, BP
    243 	ANDQ	$~15, SP     // alignment for x86_64 ABI
    244 	CALL	AX
    245 	MOVQ	BP, SP
    246 	POPQ	BP
    247 	RET
    248 
    249 TEXT runtimesigtramp(SB),NOSPLIT,$72
    250 	// Save callee-saved C registers, since the caller may be a C signal handler.
    251 	MOVQ	BX,  bx-8(SP)
    252 	MOVQ	BP,  bp-16(SP)  // save in case GOEXPERIMENT=noframepointer is set
    253 	MOVQ	R12, r12-24(SP)
    254 	MOVQ	R13, r13-32(SP)
    255 	MOVQ	R14, r14-40(SP)
    256 	MOVQ	R15, r15-48(SP)
    257 	// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
    258 	// modify them.
    259 
    260 	MOVQ	DX, ctx-56(SP)
    261 	MOVQ	SI, info-64(SP)
    262 	MOVQ	DI, signum-72(SP)
    263 	CALL	runtimesigtrampgo(SB)
    264 
    265 	MOVQ	r15-48(SP), R15
    266 	MOVQ	r14-40(SP), R14
    267 	MOVQ	r13-32(SP), R13
    268 	MOVQ	r12-24(SP), R12
    269 	MOVQ	bp-16(SP),  BP
    270 	MOVQ	bx-8(SP),   BX
    271 	RET
    272 
    273 TEXT runtimemmap(SB),NOSPLIT,$0
    274 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    275 	MOVQ	n+8(FP), SI		// arg 2 - len
    276 	MOVL	prot+16(FP), DX		// arg 3 - prot
    277 	MOVL	flags+20(FP), R10		// arg 4 - flags
    278 	MOVL	fd+24(FP), R8		// arg 5 - fd
    279 	MOVL	off+28(FP), R9
    280 	SUBQ	$16, SP
    281 	MOVQ	R9, 8(SP)		// arg 7 - offset (passed on stack)
    282 	MOVQ	$0, R9			// arg 6 - pad
    283 	MOVL	$197, AX
    284 	SYSCALL
    285 	JCC	ok
    286 	ADDQ	$16, SP
    287 	MOVQ	$0, p+32(FP)
    288 	MOVQ	AX, err+40(FP)
    289 	RET
    290 ok:
    291 	ADDQ	$16, SP
    292 	MOVQ	AX, p+32(FP)
    293 	MOVQ	$0, err+40(FP)
    294 	RET
    295 
    296 TEXT runtimemunmap(SB),NOSPLIT,$0
    297 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    298 	MOVQ	n+8(FP), SI		// arg 2 - len
    299 	MOVL	$73, AX			// sys_munmap
    300 	SYSCALL
    301 	JCC	2(PC)
    302 	MOVL	$0xf1, 0xf1		// crash
    303 	RET
    304 
    305 TEXT runtimemadvise(SB),NOSPLIT,$0
    306 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    307 	MOVQ	n+8(FP), SI		// arg 2 - len
    308 	MOVL	flags+16(FP), DX	// arg 3 - behav
    309 	MOVQ	$75, AX			// sys_madvise
    310 	SYSCALL
    311 	// ignore failure - maybe pages are locked
    312 	RET
    313 
    314 TEXT runtimesigaltstack(SB),NOSPLIT,$-8
    315 	MOVQ	new+0(FP), DI		// arg 1 - nss
    316 	MOVQ	old+8(FP), SI		// arg 2 - oss
    317 	MOVQ	$288, AX		// sys_sigaltstack
    318 	SYSCALL
    319 	JCC	2(PC)
    320 	MOVL	$0xf1, 0xf1		// crash
    321 	RET
    322 
    323 // set tls base to DI
    324 TEXT runtimesettls(SB),NOSPLIT,$0
    325 	// adjust for ELF: wants to use -8(FS) for g
    326 	ADDQ	$8, DI
    327 	MOVQ	$329, AX		// sys___settcb
    328 	SYSCALL
    329 	JCC	2(PC)
    330 	MOVL	$0xf1, 0xf1		// crash
    331 	RET
    332 
    333 TEXT runtimesysctl(SB),NOSPLIT,$0
    334 	MOVQ	mib+0(FP), DI		// arg 1 - name
    335 	MOVL	miblen+8(FP), SI		// arg 2 - namelen
    336 	MOVQ	out+16(FP), DX		// arg 3 - oldp
    337 	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
    338 	MOVQ	dst+32(FP), R8		// arg 5 - newp
    339 	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
    340 	MOVQ	$202, AX		// sys___sysctl
    341 	SYSCALL
    342 	JCC	4(PC)
    343 	NEGQ	AX
    344 	MOVL	AX, ret+48(FP)
    345 	RET
    346 	MOVL	$0, AX
    347 	MOVL	AX, ret+48(FP)
    348 	RET
    349 
    350 // int32 runtimekqueue(void);
    351 TEXT runtimekqueue(SB),NOSPLIT,$0
    352 	MOVQ	$0, DI
    353 	MOVQ	$0, SI
    354 	MOVQ	$0, DX
    355 	MOVL	$269, AX
    356 	SYSCALL
    357 	JCC	2(PC)
    358 	NEGQ	AX
    359 	MOVL	AX, ret+0(FP)
    360 	RET
    361 
    362 // int32 runtimekevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
    363 TEXT runtimekevent(SB),NOSPLIT,$0
    364 	MOVL	kq+0(FP), DI
    365 	MOVQ	ch+8(FP), SI
    366 	MOVL	nch+16(FP), DX
    367 	MOVQ	ev+24(FP), R10
    368 	MOVL	nev+32(FP), R8
    369 	MOVQ	ts+40(FP), R9
    370 	MOVL	$72, AX
    371 	SYSCALL
    372 	JCC	2(PC)
    373 	NEGQ	AX
    374 	MOVL	AX, ret+48(FP)
    375 	RET
    376 
    377 // void runtimecloseonexec(int32 fd);
    378 TEXT runtimecloseonexec(SB),NOSPLIT,$0
    379 	MOVL	fd+0(FP), DI	// fd
    380 	MOVQ	$2, SI		// F_SETFD
    381 	MOVQ	$1, DX		// FD_CLOEXEC
    382 	MOVL	$92, AX		// fcntl
    383 	SYSCALL
    384 	RET
    385