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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 - pid
    160 	MOVL	sig+0(FP), SI		// arg 2 - signum
    161 	MOVL	$37, AX			// sys_kill
    162 	SYSCALL
    163 	RET
    164 
    165 TEXT runtimeraiseproc(SB),NOSPLIT,$16
    166 	MOVL	$20, AX			// sys_getpid
    167 	SYSCALL
    168 	MOVQ	AX, DI			// arg 1 - pid
    169 	MOVL	sig+0(FP), SI		// arg 2 - signum
    170 	MOVL	$37, AX			// sys_kill
    171 	SYSCALL
    172 	RET
    173 
    174 TEXT runtimesetitimer(SB),NOSPLIT,$-8
    175 	MOVL	mode+0(FP), DI		// arg 1 - which
    176 	MOVQ	new+8(FP), SI		// arg 2 - itv
    177 	MOVQ	old+16(FP), DX		// arg 3 - oitv
    178 	MOVL	$69, AX			// sys_setitimer
    179 	SYSCALL
    180 	RET
    181 
    182 // func now() (sec int64, nsec int32)
    183 TEXT timenow(SB), NOSPLIT, $32
    184 	MOVQ	$0, DI			// arg 1 - clock_id
    185 	LEAQ	8(SP), SI		// arg 2 - tp
    186 	MOVL	$87, AX			// sys_clock_gettime
    187 	SYSCALL
    188 	MOVQ	8(SP), AX		// sec
    189 	MOVQ	16(SP), DX		// nsec
    190 
    191 	// sec is in AX, nsec in DX
    192 	MOVQ	AX, sec+0(FP)
    193 	MOVL	DX, nsec+8(FP)
    194 	RET
    195 
    196 TEXT runtimenanotime(SB),NOSPLIT,$24
    197 	MOVQ	CLOCK_MONOTONIC, DI	// arg 1 - clock_id
    198 	LEAQ	8(SP), SI		// arg 2 - tp
    199 	MOVL	$87, AX			// sys_clock_gettime
    200 	SYSCALL
    201 	MOVQ	8(SP), AX		// sec
    202 	MOVQ	16(SP), DX		// nsec
    203 
    204 	// sec is in AX, nsec in DX
    205 	// return nsec in AX
    206 	IMULQ	$1000000000, AX
    207 	ADDQ	DX, AX
    208 	MOVQ	AX, ret+0(FP)
    209 	RET
    210 
    211 TEXT runtimesigaction(SB),NOSPLIT,$-8
    212 	MOVL	sig+0(FP), DI		// arg 1 - signum
    213 	MOVQ	new+8(FP), SI		// arg 2 - nsa
    214 	MOVQ	old+16(FP), DX		// arg 3 - osa
    215 	MOVL	$46, AX
    216 	SYSCALL
    217 	JCC	2(PC)
    218 	MOVL	$0xf1, 0xf1		// crash
    219 	RET
    220 
    221 TEXT runtimesigprocmask(SB),NOSPLIT,$0
    222 	MOVL	mode+0(FP), DI		// arg 1 - how
    223 	MOVL	new+4(FP), SI		// arg 2 - set
    224 	MOVL	$48, AX			// sys_sigprocmask
    225 	SYSCALL
    226 	JCC	2(PC)
    227 	MOVL	$0xf1, 0xf1		// crash
    228 	MOVL	AX, ret+8(FP)
    229 	RET
    230 
    231 TEXT runtimesigtramp(SB),NOSPLIT,$64
    232 	get_tls(BX)
    233 
    234 	// check that g exists
    235 	MOVQ	g(BX), R10
    236 	CMPQ	R10, $0
    237 	JNE	5(PC)
    238 	MOVQ	DI, 0(SP)
    239 	MOVQ	$runtimebadsignal(SB), AX
    240 	CALL	AX
    241 	RET
    242 
    243 	// save g
    244 	MOVQ	R10, 40(SP)
    245 
    246 	// g = m->signal
    247 	MOVQ	g_m(R10), AX
    248 	MOVQ	m_gsignal(AX), AX
    249 	MOVQ	AX, g(BX)
    250 
    251 	MOVQ	DI, 0(SP)
    252 	MOVQ	SI, 8(SP)
    253 	MOVQ	DX, 16(SP)
    254 	MOVQ	R10, 24(SP)
    255 
    256 	CALL	runtimesighandler(SB)
    257 
    258 	// restore g
    259 	get_tls(BX)
    260 	MOVQ	40(SP), R10
    261 	MOVQ	R10, g(BX)
    262 	RET
    263 
    264 TEXT runtimemmap(SB),NOSPLIT,$0
    265 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    266 	MOVQ	n+8(FP), SI		// arg 2 - len
    267 	MOVL	prot+16(FP), DX		// arg 3 - prot
    268 	MOVL	flags+20(FP), R10		// arg 4 - flags
    269 	MOVL	fd+24(FP), R8		// arg 5 - fd
    270 	MOVL	off+28(FP), R9
    271 	SUBQ	$16, SP
    272 	MOVQ	R9, 8(SP)		// arg 7 - offset (passed on stack)
    273 	MOVQ	$0, R9			// arg 6 - pad
    274 	MOVL	$197, AX
    275 	SYSCALL
    276 	ADDQ	$16, SP
    277 	MOVQ	AX, ret+32(FP)
    278 	RET
    279 
    280 TEXT runtimemunmap(SB),NOSPLIT,$0
    281 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    282 	MOVQ	n+8(FP), SI		// arg 2 - len
    283 	MOVL	$73, AX			// sys_munmap
    284 	SYSCALL
    285 	JCC	2(PC)
    286 	MOVL	$0xf1, 0xf1		// crash
    287 	RET
    288 
    289 TEXT runtimemadvise(SB),NOSPLIT,$0
    290 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    291 	MOVQ	n+8(FP), SI		// arg 2 - len
    292 	MOVL	flags+16(FP), DX	// arg 3 - behav
    293 	MOVQ	$75, AX			// sys_madvise
    294 	SYSCALL
    295 	// ignore failure - maybe pages are locked
    296 	RET
    297 
    298 TEXT runtimesigaltstack(SB),NOSPLIT,$-8
    299 	MOVQ	new+8(SP), DI		// arg 1 - nss
    300 	MOVQ	old+16(SP), SI		// arg 2 - oss
    301 	MOVQ	$288, AX		// sys_sigaltstack
    302 	SYSCALL
    303 	JCC	2(PC)
    304 	MOVL	$0xf1, 0xf1		// crash
    305 	RET
    306 
    307 // set tls base to DI
    308 TEXT runtimesettls(SB),NOSPLIT,$0
    309 	// adjust for ELF: wants to use -16(FS) and -8(FS) for g and m
    310 	ADDQ	$8, DI
    311 	MOVQ	$329, AX		// sys___settcb
    312 	SYSCALL
    313 	JCC	2(PC)
    314 	MOVL	$0xf1, 0xf1		// crash
    315 	RET
    316 
    317 TEXT runtimesysctl(SB),NOSPLIT,$0
    318 	MOVQ	mib+0(FP), DI		// arg 1 - name
    319 	MOVL	miblen+8(FP), SI		// arg 2 - namelen
    320 	MOVQ	out+16(FP), DX		// arg 3 - oldp
    321 	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
    322 	MOVQ	dst+32(FP), R8		// arg 5 - newp
    323 	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
    324 	MOVQ	$202, AX		// sys___sysctl
    325 	SYSCALL
    326 	JCC	4(PC)
    327 	NEGQ	AX
    328 	MOVL	AX, ret+48(FP)
    329 	RET
    330 	MOVL	$0, AX
    331 	MOVL	AX, ret+48(FP)
    332 	RET
    333 
    334 // int32 runtimekqueue(void);
    335 TEXT runtimekqueue(SB),NOSPLIT,$0
    336 	MOVQ	$0, DI
    337 	MOVQ	$0, SI
    338 	MOVQ	$0, DX
    339 	MOVL	$269, AX
    340 	SYSCALL
    341 	JCC	2(PC)
    342 	NEGQ	AX
    343 	MOVL	AX, ret+0(FP)
    344 	RET
    345 
    346 // int32 runtimekevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
    347 TEXT runtimekevent(SB),NOSPLIT,$0
    348 	MOVL	fd+0(FP), DI
    349 	MOVQ	ev1+8(FP), SI
    350 	MOVL	nev1+16(FP), DX
    351 	MOVQ	ev2+24(FP), R10
    352 	MOVL	nev2+32(FP), R8
    353 	MOVQ	ts+40(FP), R9
    354 	MOVL	$72, AX
    355 	SYSCALL
    356 	JCC	2(PC)
    357 	NEGQ	AX
    358 	MOVL	AX, ret+48(FP)
    359 	RET
    360 
    361 // void runtimecloseonexec(int32 fd);
    362 TEXT runtimecloseonexec(SB),NOSPLIT,$0
    363 	MOVL	fd+0(FP), DI	// fd
    364 	MOVQ	$2, SI		// F_SETFD
    365 	MOVQ	$1, DX		// FD_CLOEXEC
    366 	MOVL	$92, AX		// fcntl
    367 	SYSCALL
    368 	RET
    369