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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_op(SB),NOSPLIT,$0
     14 	MOVQ addr+0(FP), DI
     15 	MOVL mode+8(FP), SI
     16 	MOVL val+12(FP), DX
     17 	MOVQ uaddr1+16(FP), R10
     18 	MOVQ ut+24(FP), R8
     19 	MOVL $454, AX
     20 	SYSCALL
     21 	MOVL	AX, ret+32(FP)
     22 	RET
     23 
     24 TEXT runtimethr_new(SB),NOSPLIT,$0
     25 	MOVQ param+0(FP), DI
     26 	MOVL size+8(FP), SI
     27 	MOVL $455, AX
     28 	SYSCALL
     29 	RET
     30 
     31 TEXT runtimethr_start(SB),NOSPLIT,$0
     32 	MOVQ	DI, R13 // m
     33 
     34 	// set up FS to point at m->tls
     35 	LEAQ	m_tls(R13), DI
     36 	CALL	runtimesettls(SB)	// smashes DI
     37 
     38 	// set up m, g
     39 	get_tls(CX)
     40 	MOVQ	m_g0(R13), DI
     41 	MOVQ	R13, g_m(DI)
     42 	MOVQ	DI, g(CX)
     43 
     44 	CALL	runtimestackcheck(SB)
     45 	CALL	runtimemstart(SB)
     46 
     47 	MOVQ 0, AX			// crash (not reached)
     48 
     49 // Exit the entire program (like C exit)
     50 TEXT runtimeexit(SB),NOSPLIT,$-8
     51 	MOVL	code+0(FP), DI		// arg 1 exit status
     52 	MOVL	$1, AX
     53 	SYSCALL
     54 	MOVL	$0xf1, 0xf1  // crash
     55 	RET
     56 
     57 TEXT runtimeexit1(SB),NOSPLIT,$-8
     58 	MOVL	code+0(FP), DI		// arg 1 exit status
     59 	MOVL	$431, AX
     60 	SYSCALL
     61 	MOVL	$0xf1, 0xf1  // crash
     62 	RET
     63 
     64 TEXT runtimeopen(SB),NOSPLIT,$-8
     65 	MOVQ	name+0(FP), DI		// arg 1 pathname
     66 	MOVL	mode+8(FP), SI		// arg 2 flags
     67 	MOVL	perm+12(FP), DX		// arg 3 mode
     68 	MOVL	$5, AX
     69 	SYSCALL
     70 	JCC	2(PC)
     71 	MOVL	$-1, AX
     72 	MOVL	AX, ret+16(FP)
     73 	RET
     74 
     75 TEXT runtimeclosefd(SB),NOSPLIT,$-8
     76 	MOVL	fd+0(FP), DI		// arg 1 fd
     77 	MOVL	$6, AX
     78 	SYSCALL
     79 	JCC	2(PC)
     80 	MOVL	$-1, AX
     81 	MOVL	AX, ret+8(FP)
     82 	RET
     83 
     84 TEXT runtimeread(SB),NOSPLIT,$-8
     85 	MOVL	fd+0(FP), DI		// arg 1 fd
     86 	MOVQ	p+8(FP), SI		// arg 2 buf
     87 	MOVL	n+16(FP), DX		// arg 3 count
     88 	MOVL	$3, AX
     89 	SYSCALL
     90 	JCC	2(PC)
     91 	MOVL	$-1, AX
     92 	MOVL	AX, ret+24(FP)
     93 	RET
     94 
     95 TEXT runtimewrite(SB),NOSPLIT,$-8
     96 	MOVQ	fd+0(FP), DI		// arg 1 fd
     97 	MOVQ	p+8(FP), SI		// arg 2 buf
     98 	MOVL	n+16(FP), DX		// arg 3 count
     99 	MOVL	$4, AX
    100 	SYSCALL
    101 	JCC	2(PC)
    102 	MOVL	$-1, AX
    103 	MOVL	AX, ret+24(FP)
    104 	RET
    105 
    106 TEXT runtimegetrlimit(SB),NOSPLIT,$-8
    107 	MOVL	kind+0(FP), DI
    108 	MOVQ	limit+8(FP), SI
    109 	MOVL	$194, AX
    110 	SYSCALL
    111 	MOVL	AX, ret+16(FP)
    112 	RET
    113 
    114 TEXT runtimeraise(SB),NOSPLIT,$16
    115 	// thr_self(&8(SP))
    116 	LEAQ	8(SP), DI	// arg 1 &8(SP)
    117 	MOVL	$432, AX
    118 	SYSCALL
    119 	// thr_kill(self, SIGPIPE)
    120 	MOVQ	8(SP), DI	// arg 1 id
    121 	MOVL	sig+0(FP), SI	// arg 2
    122 	MOVL	$433, AX
    123 	SYSCALL
    124 	RET
    125 
    126 TEXT runtimeraiseproc(SB),NOSPLIT,$0
    127 	// getpid
    128 	MOVL	$20, AX
    129 	SYSCALL
    130 	// kill(self, sig)
    131 	MOVQ	AX, DI		// arg 1 pid
    132 	MOVL	sig+0(FP), SI	// arg 2 sig
    133 	MOVL	$37, AX
    134 	SYSCALL
    135 	RET
    136 
    137 TEXT runtimesetitimer(SB), NOSPLIT, $-8
    138 	MOVL	mode+0(FP), DI
    139 	MOVQ	new+8(FP), SI
    140 	MOVQ	old+16(FP), DX
    141 	MOVL	$83, AX
    142 	SYSCALL
    143 	RET
    144 
    145 // func now() (sec int64, nsec int32)
    146 TEXT timenow(SB), NOSPLIT, $32
    147 	MOVL	$232, AX // clock_gettime
    148 	MOVQ	$0, DI		// CLOCK_REALTIME
    149 	LEAQ	8(SP), SI
    150 	SYSCALL
    151 	MOVQ	8(SP), AX	// sec
    152 	MOVQ	16(SP), DX	// nsec
    153 
    154 	// sec is in AX, nsec in DX
    155 	MOVQ	AX, sec+0(FP)
    156 	MOVL	DX, nsec+8(FP)
    157 	RET
    158 
    159 TEXT runtimenanotime(SB), NOSPLIT, $32
    160 	MOVL	$232, AX
    161 	// We can use CLOCK_MONOTONIC_FAST here when we drop
    162 	// support for FreeBSD 8-STABLE.
    163 	MOVQ	$4, DI		// CLOCK_MONOTONIC
    164 	LEAQ	8(SP), SI
    165 	SYSCALL
    166 	MOVQ	8(SP), AX	// sec
    167 	MOVQ	16(SP), DX	// nsec
    168 
    169 	// sec is in AX, nsec in DX
    170 	// return nsec in AX
    171 	IMULQ	$1000000000, AX
    172 	ADDQ	DX, AX
    173 	MOVQ	AX, ret+0(FP)
    174 	RET
    175 
    176 TEXT runtimesigaction(SB),NOSPLIT,$-8
    177 	MOVL	sig+0(FP), DI		// arg 1 sig
    178 	MOVQ	new+8(FP), SI		// arg 2 act
    179 	MOVQ	old+16(FP), DX		// arg 3 oact
    180 	MOVL	$416, AX
    181 	SYSCALL
    182 	JCC	2(PC)
    183 	MOVL	$0xf1, 0xf1  // crash
    184 	RET
    185 
    186 TEXT runtimesigfwd(SB),NOSPLIT,$0-32
    187 	MOVQ	fn+0(FP),    AX
    188 	MOVL	sig+8(FP),   DI
    189 	MOVQ	info+16(FP), SI
    190 	MOVQ	ctx+24(FP),  DX
    191 	PUSHQ	BP
    192 	MOVQ	SP, BP
    193 	ANDQ	$~15, SP     // alignment for x86_64 ABI
    194 	CALL	AX
    195 	MOVQ	BP, SP
    196 	POPQ	BP
    197 	RET
    198 
    199 TEXT runtimesigtramp(SB),NOSPLIT,$72
    200 	// Save callee-saved C registers, since the caller may be a C signal handler.
    201 	MOVQ	BX, bx-8(SP)
    202 	MOVQ	BP, bp-16(SP)  // save in case GOEXPERIMENT=noframepointer is set
    203 	MOVQ	R12, r12-24(SP)
    204 	MOVQ	R13, r13-32(SP)
    205 	MOVQ	R14, r14-40(SP)
    206 	MOVQ	R15, r15-48(SP)
    207 	// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
    208 	// modify them.
    209 
    210 	MOVQ	DX, ctx-56(SP)
    211 	MOVQ	SI, info-64(SP)
    212 	MOVQ	DI, signum-72(SP)
    213 	CALL	runtimesigtrampgo(SB)
    214 
    215 	MOVQ	r15-48(SP), R15
    216 	MOVQ	r14-40(SP), R14
    217 	MOVQ	r13-32(SP), R13
    218 	MOVQ	r12-24(SP), R12
    219 	MOVQ	bp-16(SP),  BP
    220 	MOVQ	bx-8(SP),   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 fid
    229 	MOVL	off+28(FP), R9		// arg 6 offset
    230 	MOVL	$477, AX
    231 	SYSCALL
    232 	MOVQ	AX, ret+32(FP)
    233 	RET
    234 
    235 TEXT runtimemunmap(SB),NOSPLIT,$0
    236 	MOVQ	addr+0(FP), DI		// arg 1 addr
    237 	MOVQ	n+8(FP), SI		// arg 2 len
    238 	MOVL	$73, AX
    239 	SYSCALL
    240 	JCC	2(PC)
    241 	MOVL	$0xf1, 0xf1  // crash
    242 	RET
    243 
    244 TEXT runtimemadvise(SB),NOSPLIT,$0
    245 	MOVQ	addr+0(FP), DI
    246 	MOVQ	n+8(FP), SI
    247 	MOVL	flags+16(FP), DX
    248 	MOVQ	$75, AX	// madvise
    249 	SYSCALL
    250 	// ignore failure - maybe pages are locked
    251 	RET
    252 
    253 TEXT runtimesigaltstack(SB),NOSPLIT,$-8
    254 	MOVQ	new+0(FP), DI
    255 	MOVQ	old+8(FP), SI
    256 	MOVQ	$53, AX
    257 	SYSCALL
    258 	JCC	2(PC)
    259 	MOVL	$0xf1, 0xf1  // crash
    260 	RET
    261 
    262 TEXT runtimeusleep(SB),NOSPLIT,$16
    263 	MOVL	$0, DX
    264 	MOVL	usec+0(FP), AX
    265 	MOVL	$1000000, CX
    266 	DIVL	CX
    267 	MOVQ	AX, 0(SP)		// tv_sec
    268 	MOVL	$1000, AX
    269 	MULL	DX
    270 	MOVQ	AX, 8(SP)		// tv_nsec
    271 
    272 	MOVQ	SP, DI			// arg 1 - rqtp
    273 	MOVQ	$0, SI			// arg 2 - rmtp
    274 	MOVL	$240, AX		// sys_nanosleep
    275 	SYSCALL
    276 	RET
    277 
    278 // set tls base to DI
    279 TEXT runtimesettls(SB),NOSPLIT,$8
    280 	ADDQ	$8, DI	// adjust for ELF: wants to use -8(FS) for g and m
    281 	MOVQ	DI, 0(SP)
    282 	MOVQ	SP, SI
    283 	MOVQ	$129, DI	// AMD64_SET_FSBASE
    284 	MOVQ	$165, AX	// sysarch
    285 	SYSCALL
    286 	JCC	2(PC)
    287 	MOVL	$0xf1, 0xf1  // crash
    288 	RET
    289 
    290 TEXT runtimesysctl(SB),NOSPLIT,$0
    291 	MOVQ	mib+0(FP), DI		// arg 1 - name
    292 	MOVL	miblen+8(FP), SI		// arg 2 - namelen
    293 	MOVQ	out+16(FP), DX		// arg 3 - oldp
    294 	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
    295 	MOVQ	dst+32(FP), R8		// arg 5 - newp
    296 	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
    297 	MOVQ	$202, AX		// sys___sysctl
    298 	SYSCALL
    299 	JCC 4(PC)
    300 	NEGQ	AX
    301 	MOVL	AX, ret+48(FP)
    302 	RET
    303 	MOVL	$0, AX
    304 	MOVL	AX, ret+48(FP)
    305 	RET
    306 
    307 TEXT runtimeosyield(SB),NOSPLIT,$-4
    308 	MOVL	$331, AX		// sys_sched_yield
    309 	SYSCALL
    310 	RET
    311 
    312 TEXT runtimesigprocmask(SB),NOSPLIT,$0
    313 	MOVL	how+0(FP), DI		// arg 1 - how
    314 	MOVQ	new+8(FP), SI		// arg 2 - set
    315 	MOVQ	old+16(FP), DX		// arg 3 - oset
    316 	MOVL	$340, AX		// sys_sigprocmask
    317 	SYSCALL
    318 	JAE	2(PC)
    319 	MOVL	$0xf1, 0xf1  // crash
    320 	RET
    321 
    322 // int32 runtimekqueue(void);
    323 TEXT runtimekqueue(SB),NOSPLIT,$0
    324 	MOVQ	$0, DI
    325 	MOVQ	$0, SI
    326 	MOVQ	$0, DX
    327 	MOVL	$362, AX
    328 	SYSCALL
    329 	JCC	2(PC)
    330 	NEGQ	AX
    331 	MOVL	AX, ret+0(FP)
    332 	RET
    333 
    334 // int32 runtimekevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
    335 TEXT runtimekevent(SB),NOSPLIT,$0
    336 	MOVL	kq+0(FP), DI
    337 	MOVQ	ch+8(FP), SI
    338 	MOVL	nch+16(FP), DX
    339 	MOVQ	ev+24(FP), R10
    340 	MOVL	nev+32(FP), R8
    341 	MOVQ	ts+40(FP), R9
    342 	MOVL	$363, AX
    343 	SYSCALL
    344 	JCC	2(PC)
    345 	NEGQ	AX
    346 	MOVL	AX, ret+48(FP)
    347 	RET
    348 
    349 // void runtimecloseonexec(int32 fd);
    350 TEXT runtimecloseonexec(SB),NOSPLIT,$0
    351 	MOVL	fd+0(FP), DI	// fd
    352 	MOVQ	$2, SI		// F_SETFD
    353 	MOVQ	$1, DX		// FD_CLOEXEC
    354 	MOVL	$92, AX		// fcntl
    355 	SYSCALL
    356 	RET
    357