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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, FreeBSD
      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 TEXT runtimesys_umtx_sleep(SB),NOSPLIT,$0
     14 	MOVQ addr+0(FP), DI		// arg 1 - ptr
     15 	MOVL val+8(FP), SI		// arg 2 - value
     16 	MOVL timeout+12(FP), DX		// arg 3 - timeout
     17 	MOVL $469, AX		// umtx_sleep
     18 	SYSCALL
     19 	JCC	2(PC)
     20 	NEGQ	AX
     21 	MOVL	AX, ret+16(FP)
     22 	RET
     23 
     24 TEXT runtimesys_umtx_wakeup(SB),NOSPLIT,$0
     25 	MOVQ addr+0(FP), DI		// arg 1 - ptr
     26 	MOVL val+8(FP), SI		// arg 2 - count
     27 	MOVL $470, AX		// umtx_wakeup
     28 	SYSCALL
     29 	JCC	2(PC)
     30 	NEGQ	AX
     31 	MOVL	AX, ret+16(FP)
     32 	RET
     33 
     34 TEXT runtimelwp_create(SB),NOSPLIT,$0
     35 	MOVQ param+0(FP), DI		// arg 1 - params
     36 	MOVL $495, AX		// lwp_create
     37 	SYSCALL
     38 	MOVL	AX, ret+8(FP)
     39 	RET
     40 
     41 TEXT runtimelwp_start(SB),NOSPLIT,$0
     42 	MOVQ	DI, R13 // m
     43 
     44 	// set up FS to point at m->tls
     45 	LEAQ	m_tls(R13), DI
     46 	CALL	runtimesettls(SB)	// smashes DI
     47 
     48 	// set up m, g
     49 	get_tls(CX)
     50 	MOVQ	m_g0(R13), DI
     51 	MOVQ	R13, g_m(DI)
     52 	MOVQ	DI, g(CX)
     53 
     54 	CALL	runtimestackcheck(SB)
     55 	CALL	runtimemstart(SB)
     56 
     57 	MOVQ 0, AX			// crash (not reached)
     58 
     59 // Exit the entire program (like C exit)
     60 TEXT runtimeexit(SB),NOSPLIT,$-8
     61 	MOVL	code+0(FP), DI		// arg 1 exit status
     62 	MOVL	$1, AX
     63 	SYSCALL
     64 	MOVL	$0xf1, 0xf1  // crash
     65 	RET
     66 
     67 TEXT runtimeexit1(SB),NOSPLIT,$-8
     68 	MOVL	code+0(FP), DI		// arg 1 exit status
     69 	MOVL	$431, AX
     70 	SYSCALL
     71 	MOVL	$0xf1, 0xf1  // crash
     72 	RET
     73 
     74 TEXT runtimeopen(SB),NOSPLIT,$-8
     75 	MOVQ	name+0(FP), DI		// arg 1 pathname
     76 	MOVL	mode+8(FP), SI		// arg 2 flags
     77 	MOVL	perm+12(FP), DX		// arg 3 mode
     78 	MOVL	$5, AX
     79 	SYSCALL
     80 	JCC	2(PC)
     81 	MOVL	$-1, AX
     82 	MOVL	AX, ret+16(FP)
     83 	RET
     84 
     85 TEXT runtimeclosefd(SB),NOSPLIT,$-8
     86 	MOVL	fd+0(FP), DI		// arg 1 fd
     87 	MOVL	$6, AX
     88 	SYSCALL
     89 	JCC	2(PC)
     90 	MOVL	$-1, AX
     91 	MOVL	AX, ret+8(FP)
     92 	RET
     93 
     94 TEXT runtimeread(SB),NOSPLIT,$-8
     95 	MOVL	fd+0(FP), DI		// arg 1 fd
     96 	MOVQ	p+8(FP), SI		// arg 2 buf
     97 	MOVL	n+16(FP), DX		// arg 3 count
     98 	MOVL	$3, AX
     99 	SYSCALL
    100 	JCC	2(PC)
    101 	MOVL	$-1, AX
    102 	MOVL	AX, ret+24(FP)
    103 	RET
    104 
    105 TEXT runtimewrite(SB),NOSPLIT,$-8
    106 	MOVQ	fd+0(FP), DI		// arg 1 fd
    107 	MOVQ	p+8(FP), SI		// arg 2 buf
    108 	MOVL	n+16(FP), DX		// arg 3 count
    109 	MOVL	$4, AX
    110 	SYSCALL
    111 	JCC	2(PC)
    112 	MOVL	$-1, AX
    113 	MOVL	AX, ret+24(FP)
    114 	RET
    115 
    116 TEXT runtimegetrlimit(SB),NOSPLIT,$-8
    117 	MOVL	kind+0(FP), DI
    118 	MOVQ	limit+8(FP), SI
    119 	MOVL	$194, AX
    120 	SYSCALL
    121 	MOVL	AX, ret+16(FP)
    122 	RET
    123 
    124 TEXT runtimeraise(SB),NOSPLIT,$16
    125 	MOVL	$496, AX	// lwp_gettid
    126 	SYSCALL
    127 	MOVQ	$-1, DI		// arg 1 - pid
    128 	MOVQ	AX, SI		// arg 2 - tid
    129 	MOVL	sig+0(FP), DX	// arg 3 - signum
    130 	MOVL	$497, AX	// lwp_kill
    131 	SYSCALL
    132 	RET
    133 
    134 TEXT runtimeraiseproc(SB),NOSPLIT,$0
    135 	MOVL	$20, AX		// getpid
    136 	SYSCALL
    137 	MOVQ	AX, DI		// arg 1 - pid
    138 	MOVL	sig+0(FP), SI	// arg 2 - signum
    139 	MOVL	$37, AX		// kill
    140 	SYSCALL
    141 	RET
    142 
    143 TEXT runtimesetitimer(SB), NOSPLIT, $-8
    144 	MOVL	mode+0(FP), DI
    145 	MOVQ	new+8(FP), SI
    146 	MOVQ	old+16(FP), DX
    147 	MOVL	$83, AX
    148 	SYSCALL
    149 	RET
    150 
    151 // func now() (sec int64, nsec int32)
    152 TEXT timenow(SB), NOSPLIT, $32
    153 	MOVL	$232, AX
    154 	MOVQ	$0, DI  	// CLOCK_REALTIME
    155 	LEAQ	8(SP), SI
    156 	SYSCALL
    157 	MOVQ	8(SP), AX	// sec
    158 	MOVQ	16(SP), DX	// nsec
    159 
    160 	// sec is in AX, nsec in DX
    161 	MOVQ	AX, sec+0(FP)
    162 	MOVL	DX, nsec+8(FP)
    163 	RET
    164 
    165 TEXT runtimenanotime(SB), NOSPLIT, $32
    166 	MOVL	$232, AX
    167 	MOVQ	$4, DI  	// CLOCK_MONOTONIC
    168 	LEAQ	8(SP), SI
    169 	SYSCALL
    170 	MOVQ	8(SP), AX	// sec
    171 	MOVQ	16(SP), DX	// nsec
    172 
    173 	// sec is in AX, nsec in DX
    174 	// return nsec in AX
    175 	IMULQ	$1000000000, AX
    176 	ADDQ	DX, AX
    177 	MOVQ	AX, ret+0(FP)
    178 	RET
    179 
    180 TEXT runtimesigaction(SB),NOSPLIT,$-8
    181 	MOVL	sig+0(FP), DI		// arg 1 sig
    182 	MOVQ	new+8(FP), SI		// arg 2 act
    183 	MOVQ	old+16(FP), DX		// arg 3 oact
    184 	MOVL	$342, AX
    185 	SYSCALL
    186 	JCC	2(PC)
    187 	MOVL	$0xf1, 0xf1  // crash
    188 	RET
    189 
    190 TEXT runtimesigtramp(SB),NOSPLIT,$64
    191 	get_tls(BX)
    192 
    193 	// check that g exists
    194 	MOVQ	g(BX), R10
    195 	CMPQ	R10, $0
    196 	JNE	5(PC)
    197 	MOVQ	DI, 0(SP)
    198 	MOVQ	$runtimebadsignal(SB), AX
    199 	CALL	AX
    200 	RET
    201 
    202 	// save g
    203 	MOVQ	R10, 40(SP)
    204 
    205 	// g = m->signal
    206 	MOVQ	g_m(R10), AX
    207 	MOVQ	m_gsignal(AX), AX
    208 	MOVQ	AX, g(BX)
    209 
    210 	MOVQ	DI, 0(SP)
    211 	MOVQ	SI, 8(SP)
    212 	MOVQ	DX, 16(SP)
    213 	MOVQ	R10, 24(SP)
    214 
    215 	CALL	runtimesighandler(SB)
    216 
    217 	// restore g
    218 	get_tls(BX)
    219 	MOVQ	40(SP), R10
    220 	MOVQ	R10, g(BX)
    221 	RET
    222 
    223 TEXT runtimemmap(SB),NOSPLIT,$0
    224 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    225 	MOVQ	n+8(FP), SI		// arg 2 - len
    226 	MOVL	prot+16(FP), DX		// arg 3 - prot
    227 	MOVL	flags+20(FP), R10		// arg 4 - flags
    228 	MOVL	fd+24(FP), R8		// arg 5 - fd
    229 	MOVL	off+28(FP), R9
    230 	SUBQ	$16, SP
    231 	MOVQ	R9, 8(SP)		// arg 7 - offset (passed on stack)
    232 	MOVQ	$0, R9			// arg 6 - pad
    233 	MOVL	$197, AX
    234 	SYSCALL
    235 	ADDQ	$16, SP
    236 	MOVQ	AX, ret+32(FP)
    237 	RET
    238 
    239 TEXT runtimemunmap(SB),NOSPLIT,$0
    240 	MOVQ	addr+0(FP), DI		// arg 1 addr
    241 	MOVQ	n+8(FP), SI		// arg 2 len
    242 	MOVL	$73, AX
    243 	SYSCALL
    244 	JCC	2(PC)
    245 	MOVL	$0xf1, 0xf1  // crash
    246 	RET
    247 
    248 TEXT runtimemadvise(SB),NOSPLIT,$0
    249 	MOVQ	addr+0(FP), DI
    250 	MOVQ	n+8(FP), SI
    251 	MOVL	flags+16(FP), DX
    252 	MOVQ	$75, AX	// madvise
    253 	SYSCALL
    254 	// ignore failure - maybe pages are locked
    255 	RET
    256 
    257 TEXT runtimesigaltstack(SB),NOSPLIT,$-8
    258 	MOVQ	new+8(SP), DI
    259 	MOVQ	old+16(SP), SI
    260 	MOVQ	$53, AX
    261 	SYSCALL
    262 	JCC	2(PC)
    263 	MOVL	$0xf1, 0xf1  // crash
    264 	RET
    265 
    266 TEXT runtimeusleep(SB),NOSPLIT,$16
    267 	MOVL	$0, DX
    268 	MOVL	usec+0(FP), AX
    269 	MOVL	$1000000, CX
    270 	DIVL	CX
    271 	MOVQ	AX, 0(SP)		// tv_sec
    272 	MOVL	$1000, AX
    273 	MULL	DX
    274 	MOVQ	AX, 8(SP)		// tv_nsec
    275 
    276 	MOVQ	SP, DI			// arg 1 - rqtp
    277 	MOVQ	$0, SI			// arg 2 - rmtp
    278 	MOVL	$240, AX		// sys_nanosleep
    279 	SYSCALL
    280 	RET
    281 
    282 // set tls base to DI
    283 TEXT runtimesettls(SB),NOSPLIT,$16
    284 	ADDQ	$8, DI	// adjust for ELF: wants to use -8(FS) for g
    285 	MOVQ	DI, 0(SP)
    286 	MOVQ	$16, 8(SP)
    287 	MOVQ	$0, DI			// arg 1 - which
    288 	MOVQ	SP, SI			// arg 2 - tls_info
    289 	MOVQ	$16, DX			// arg 3 - infosize
    290 	MOVQ	$472, AX		// set_tls_area
    291 	SYSCALL
    292 	JCC	2(PC)
    293 	MOVL	$0xf1, 0xf1  // crash
    294 	RET
    295 
    296 TEXT runtimesysctl(SB),NOSPLIT,$0
    297 	MOVQ	mib+0(FP), DI		// arg 1 - name
    298 	MOVL	miblen+8(FP), SI		// arg 2 - namelen
    299 	MOVQ	out+16(FP), DX		// arg 3 - oldp
    300 	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
    301 	MOVQ	dst+32(FP), R8		// arg 5 - newp
    302 	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
    303 	MOVQ	$202, AX		// sys___sysctl
    304 	SYSCALL
    305 	JCC 4(PC)
    306 	NEGQ	AX
    307 	MOVL	AX, ret+48(FP)
    308 	RET
    309 	MOVL	$0, AX
    310 	MOVL	AX, ret+48(FP)
    311 	RET
    312 
    313 TEXT runtimeosyield(SB),NOSPLIT,$-4
    314 	MOVL	$331, AX		// sys_sched_yield
    315 	SYSCALL
    316 	RET
    317 
    318 TEXT runtimesigprocmask(SB),NOSPLIT,$0
    319 	MOVL	how+0(FP), DI		// arg 1 - how
    320 	MOVQ	new+8(FP), SI		// arg 2 - set
    321 	MOVQ	old+16(FP), DX		// arg 3 - oset
    322 	MOVL	$340, AX		// sys_sigprocmask
    323 	SYSCALL
    324 	JAE	2(PC)
    325 	MOVL	$0xf1, 0xf1  // crash
    326 	RET
    327 
    328 // int32 runtimekqueue(void);
    329 TEXT runtimekqueue(SB),NOSPLIT,$0
    330 	MOVQ	$0, DI
    331 	MOVQ	$0, SI
    332 	MOVQ	$0, DX
    333 	MOVL	$362, AX
    334 	SYSCALL
    335 	JCC	2(PC)
    336 	NEGQ	AX
    337 	MOVL	AX, ret+0(FP)
    338 	RET
    339 
    340 // int32 runtimekevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
    341 TEXT runtimekevent(SB),NOSPLIT,$0
    342 	MOVL	fd+0(FP), DI
    343 	MOVQ	ev1+8(FP), SI
    344 	MOVL	nev1+16(FP), DX
    345 	MOVQ	ev2+24(FP), R10
    346 	MOVL	nev2+32(FP), R8
    347 	MOVQ	ts+40(FP), R9
    348 	MOVL	$363, AX
    349 	SYSCALL
    350 	JCC	2(PC)
    351 	NEGQ	AX
    352 	MOVL	AX, ret+48(FP)
    353 	RET
    354 
    355 // void runtimecloseonexec(int32 fd);
    356 TEXT runtimecloseonexec(SB),NOSPLIT,$0
    357 	MOVL	fd+0(FP), DI	// fd
    358 	MOVQ	$2, SI		// F_SETFD
    359 	MOVQ	$1, DX		// FD_CLOEXEC
    360 	MOVL	$92, AX		// fcntl
    361 	SYSCALL
    362 	RET
    363