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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, NetBSD
      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 // int32 lwp_create(void *context, uintptr flags, void *lwpid)
     14 TEXT runtimelwp_create(SB),NOSPLIT,$0
     15 	MOVQ	ctxt+0(FP), DI
     16 	MOVQ	flags+8(FP), SI
     17 	MOVQ	lwpid+16(FP), DX
     18 	MOVL	$309, AX		// sys__lwp_create
     19 	SYSCALL
     20 	JCC	2(PC)
     21 	NEGQ	AX
     22 	MOVL	AX, ret+24(FP)
     23 	RET
     24 
     25 TEXT runtimelwp_tramp(SB),NOSPLIT,$0
     26 
     27 	// Set FS to point at m->tls.
     28 	LEAQ	m_tls(R8), DI
     29 	CALL	runtimesettls(SB)
     30 
     31 	// Set up new stack.
     32 	get_tls(CX)
     33 	MOVQ	R8, g_m(R9)
     34 	MOVQ	R9, g(CX)
     35 	CALL	runtimestackcheck(SB)
     36 
     37 	// Call fn
     38 	CALL	R12
     39 
     40 	// It shouldn't return. If it does, exit.
     41 	MOVL	$310, AX		// sys__lwp_exit
     42 	SYSCALL
     43 	JMP	-3(PC)			// keep exiting
     44 
     45 TEXT runtimeosyield(SB),NOSPLIT,$0
     46 	MOVL	$350, AX		// sys_sched_yield
     47 	SYSCALL
     48 	RET
     49 
     50 TEXT runtimelwp_park(SB),NOSPLIT,$0
     51 	MOVL	clockid+0(FP), DI		// arg 1 - clockid
     52 	MOVL	flags+4(FP), SI			// arg 2 - flags
     53 	MOVQ	ts+8(FP), DX			// arg 3 - ts
     54 	MOVL	unpark+16(FP), R10		// arg 4 - unpark
     55 	MOVQ	hint+24(FP), R8			// arg 5 - hint
     56 	MOVQ	unparkhint+32(FP), R9		// arg 6 - unparkhint
     57 	MOVL	$478, AX			// sys__lwp_park
     58 	SYSCALL
     59 	MOVL	AX, ret+40(FP)
     60 	RET
     61 
     62 TEXT runtimelwp_unpark(SB),NOSPLIT,$0
     63 	MOVL	lwp+0(FP), DI		// arg 1 - lwp
     64 	MOVQ	hint+8(FP), SI		// arg 2 - hint
     65 	MOVL	$321, AX		// sys__lwp_unpark
     66 	SYSCALL
     67 	MOVL	AX, ret+16(FP)
     68 	RET
     69 
     70 TEXT runtimelwp_self(SB),NOSPLIT,$0
     71 	MOVL	$311, AX		// sys__lwp_self
     72 	SYSCALL
     73 	MOVL	AX, ret+0(FP)
     74 	RET
     75 
     76 // Exit the entire program (like C exit)
     77 TEXT runtimeexit(SB),NOSPLIT,$-8
     78 	MOVL	code+0(FP), DI		// arg 1 - exit status
     79 	MOVL	$1, AX			// sys_exit
     80 	SYSCALL
     81 	MOVL	$0xf1, 0xf1		// crash
     82 	RET
     83 
     84 // func exitThread(wait *uint32)
     85 TEXT runtimeexitThread(SB),NOSPLIT,$0-8
     86 	MOVQ	wait+0(FP), AX
     87 	// We're done using the stack.
     88 	MOVL	$0, (AX)
     89 	MOVL	$310, AX		// sys__lwp_exit
     90 	SYSCALL
     91 	MOVL	$0xf1, 0xf1		// crash
     92 	JMP	0(PC)
     93 
     94 TEXT runtimeopen(SB),NOSPLIT,$-8
     95 	MOVQ	name+0(FP), DI		// arg 1 pathname
     96 	MOVL	mode+8(FP), SI		// arg 2 flags
     97 	MOVL	perm+12(FP), DX		// arg 3 mode
     98 	MOVL	$5, AX
     99 	SYSCALL
    100 	JCC	2(PC)
    101 	MOVL	$-1, AX
    102 	MOVL	AX, ret+16(FP)
    103 	RET
    104 
    105 TEXT runtimeclosefd(SB),NOSPLIT,$-8
    106 	MOVL	fd+0(FP), DI		// arg 1 fd
    107 	MOVL	$6, AX
    108 	SYSCALL
    109 	JCC	2(PC)
    110 	MOVL	$-1, AX
    111 	MOVL	AX, ret+8(FP)
    112 	RET
    113 
    114 TEXT runtimeread(SB),NOSPLIT,$-8
    115 	MOVL	fd+0(FP), DI		// arg 1 fd
    116 	MOVQ	p+8(FP), SI		// arg 2 buf
    117 	MOVL	n+16(FP), DX		// arg 3 count
    118 	MOVL	$3, AX
    119 	SYSCALL
    120 	JCC	2(PC)
    121 	MOVL	$-1, AX
    122 	MOVL	AX, ret+24(FP)
    123 	RET
    124 
    125 TEXT runtimewrite(SB),NOSPLIT,$-8
    126 	MOVQ	fd+0(FP), DI		// arg 1 - fd
    127 	MOVQ	p+8(FP), SI		// arg 2 - buf
    128 	MOVL	n+16(FP), DX		// arg 3 - nbyte
    129 	MOVL	$4, AX			// sys_write
    130 	SYSCALL
    131 	JCC	2(PC)
    132 	MOVL	$-1, AX
    133 	MOVL	AX, ret+24(FP)
    134 	RET
    135 
    136 TEXT runtimeusleep(SB),NOSPLIT,$16
    137 	MOVL	$0, DX
    138 	MOVL	usec+0(FP), AX
    139 	MOVL	$1000000, CX
    140 	DIVL	CX
    141 	MOVQ	AX, 0(SP)		// tv_sec
    142 	MOVL	$1000, AX
    143 	MULL	DX
    144 	MOVQ	AX, 8(SP)		// tv_nsec
    145 
    146 	MOVQ	SP, DI			// arg 1 - rqtp
    147 	MOVQ	$0, SI			// arg 2 - rmtp
    148 	MOVL	$430, AX		// sys_nanosleep
    149 	SYSCALL
    150 	RET
    151 
    152 TEXT runtimeraise(SB),NOSPLIT,$16
    153 	MOVL	$311, AX		// sys__lwp_self
    154 	SYSCALL
    155 	MOVQ	AX, DI			// arg 1 - target
    156 	MOVL	sig+0(FP), SI		// arg 2 - signo
    157 	MOVL	$318, AX		// sys__lwp_kill
    158 	SYSCALL
    159 	RET
    160 
    161 TEXT runtimeraiseproc(SB),NOSPLIT,$16
    162 	MOVL	$20, AX			// sys_getpid
    163 	SYSCALL
    164 	MOVQ	AX, DI			// arg 1 - pid
    165 	MOVL	sig+0(FP), SI		// arg 2 - signo
    166 	MOVL	$37, AX			// sys_kill
    167 	SYSCALL
    168 	RET
    169 
    170 TEXT runtimesetitimer(SB),NOSPLIT,$-8
    171 	MOVL	mode+0(FP), DI		// arg 1 - which
    172 	MOVQ	new+8(FP), SI		// arg 2 - itv
    173 	MOVQ	old+16(FP), DX		// arg 3 - oitv
    174 	MOVL	$425, AX		// sys_setitimer
    175 	SYSCALL
    176 	RET
    177 
    178 // func walltime() (sec int64, nsec int32)
    179 TEXT runtimewalltime(SB), NOSPLIT, $32
    180 	MOVQ	$0, DI			// arg 1 - clock_id
    181 	LEAQ	8(SP), SI		// arg 2 - tp
    182 	MOVL	$427, AX		// sys_clock_gettime
    183 	SYSCALL
    184 	MOVQ	8(SP), AX		// sec
    185 	MOVL	16(SP), DX		// nsec
    186 
    187 	// sec is in AX, nsec in DX
    188 	MOVQ	AX, sec+0(FP)
    189 	MOVL	DX, nsec+8(FP)
    190 	RET
    191 
    192 TEXT runtimenanotime(SB),NOSPLIT,$32
    193 	MOVQ	$3, DI			// arg 1 - clock_id CLOCK_MONOTONIC
    194 	LEAQ	8(SP), SI		// arg 2 - tp
    195 	MOVL	$427, AX		// sys_clock_gettime
    196 	SYSCALL
    197 	MOVQ	8(SP), AX		// sec
    198 	MOVL	16(SP), DX		// nsec
    199 
    200 	// sec is in AX, nsec in DX
    201 	// return nsec in AX
    202 	IMULQ	$1000000000, AX
    203 	ADDQ	DX, AX
    204 	MOVQ	AX, ret+0(FP)
    205 	RET
    206 
    207 TEXT runtimegetcontext(SB),NOSPLIT,$-8
    208 	MOVQ	ctxt+0(FP), DI		// arg 1 - context
    209 	MOVL	$307, AX		// sys_getcontext
    210 	SYSCALL
    211 	JCC	2(PC)
    212 	MOVL	$0xf1, 0xf1		// crash
    213 	RET
    214 
    215 TEXT runtimesigprocmask(SB),NOSPLIT,$0
    216 	MOVL	how+0(FP), DI		// arg 1 - how
    217 	MOVQ	new+8(FP), SI		// arg 2 - set
    218 	MOVQ	old+16(FP), DX		// arg 3 - oset
    219 	MOVL	$293, AX		// sys_sigprocmask
    220 	SYSCALL
    221 	JCC	2(PC)
    222 	MOVL	$0xf1, 0xf1		// crash
    223 	RET
    224 
    225 TEXT runtimesigreturn_tramp(SB),NOSPLIT,$-8
    226 	MOVQ	R15, DI			// Load address of ucontext
    227 	MOVQ	$308, AX		// sys_setcontext
    228 	SYSCALL
    229 	MOVQ	$-1, DI			// Something failed...
    230 	MOVL	$1, AX			// sys_exit
    231 	SYSCALL
    232 
    233 TEXT runtimesigaction(SB),NOSPLIT,$-8
    234 	MOVL	sig+0(FP), DI		// arg 1 - signum
    235 	MOVQ	new+8(FP), SI		// arg 2 - nsa
    236 	MOVQ	old+16(FP), DX		// arg 3 - osa
    237 					// arg 4 - tramp
    238 	LEAQ	runtimesigreturn_tramp(SB), R10
    239 	MOVQ	$2, R8			// arg 5 - vers
    240 	MOVL	$340, AX		// sys___sigaction_sigtramp
    241 	SYSCALL
    242 	JCC	2(PC)
    243 	MOVL	$0xf1, 0xf1		// crash
    244 	RET
    245 
    246 TEXT runtimesigfwd(SB),NOSPLIT,$0-32
    247 	MOVQ	fn+0(FP),    AX
    248 	MOVL	sig+8(FP),   DI
    249 	MOVQ	info+16(FP), SI
    250 	MOVQ	ctx+24(FP),  DX
    251 	PUSHQ	BP
    252 	MOVQ	SP, BP
    253 	ANDQ	$~15, SP     // alignment for x86_64 ABI
    254 	CALL	AX
    255 	MOVQ	BP, SP
    256 	POPQ	BP
    257 	RET
    258 
    259 TEXT runtimesigtramp(SB),NOSPLIT,$72
    260 	// Save callee-saved C registers, since the caller may be a C signal handler.
    261 	MOVQ	BX,  bx-8(SP)
    262 	MOVQ	BP,  bp-16(SP)  // save in case GOEXPERIMENT=noframepointer is set
    263 	MOVQ	R12, r12-24(SP)
    264 	MOVQ	R13, r13-32(SP)
    265 	MOVQ	R14, r14-40(SP)
    266 	MOVQ	R15, r15-48(SP)
    267 	// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
    268 	// modify them.
    269 
    270 	MOVQ	DX, ctx-56(SP)
    271 	MOVQ	SI, info-64(SP)
    272 	MOVQ	DI, signum-72(SP)
    273 	CALL	runtimesigtrampgo(SB)
    274 
    275 	MOVQ	r15-48(SP), R15
    276 	MOVQ	r14-40(SP), R14
    277 	MOVQ	r13-32(SP), R13
    278 	MOVQ	r12-24(SP), R12
    279 	MOVQ	bp-16(SP),  BP
    280 	MOVQ	bx-8(SP),   BX
    281 	RET
    282 
    283 TEXT runtimemmap(SB),NOSPLIT,$0
    284 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    285 	MOVQ	n+8(FP), SI		// arg 2 - len
    286 	MOVL	prot+16(FP), DX		// arg 3 - prot
    287 	MOVL	flags+20(FP), R10		// arg 4 - flags
    288 	MOVL	fd+24(FP), R8		// arg 5 - fd
    289 	MOVL	off+28(FP), R9
    290 	SUBQ	$16, SP
    291 	MOVQ	R9, 8(SP)		// arg 7 - offset (passed on stack)
    292 	MOVQ	$0, R9			// arg 6 - pad
    293 	MOVL	$197, AX		// sys_mmap
    294 	SYSCALL
    295 	JCC	ok
    296 	ADDQ	$16, SP
    297 	MOVQ	$0, p+32(FP)
    298 	MOVQ	AX, err+40(FP)
    299 	RET
    300 ok:
    301 	ADDQ	$16, SP
    302 	MOVQ	AX, p+32(FP)
    303 	MOVQ	$0, err+40(FP)
    304 	RET
    305 
    306 TEXT runtimemunmap(SB),NOSPLIT,$0
    307 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    308 	MOVQ	n+8(FP), SI		// arg 2 - len
    309 	MOVL	$73, AX			// sys_munmap
    310 	SYSCALL
    311 	JCC	2(PC)
    312 	MOVL	$0xf1, 0xf1		// crash
    313 	RET
    314 
    315 
    316 TEXT runtimemadvise(SB),NOSPLIT,$0
    317 	MOVQ	addr+0(FP), DI		// arg 1 - addr
    318 	MOVQ	n+8(FP), SI		// arg 2 - len
    319 	MOVL	flags+16(FP), DX	// arg 3 - behav
    320 	MOVQ	$75, AX			// sys_madvise
    321 	SYSCALL
    322 	// ignore failure - maybe pages are locked
    323 	RET
    324 
    325 TEXT runtimesigaltstack(SB),NOSPLIT,$-8
    326 	MOVQ	new+0(FP), DI		// arg 1 - nss
    327 	MOVQ	old+8(FP), SI		// arg 2 - oss
    328 	MOVQ	$281, AX		// sys___sigaltstack14
    329 	SYSCALL
    330 	JCC	2(PC)
    331 	MOVL	$0xf1, 0xf1		// crash
    332 	RET
    333 
    334 // set tls base to DI
    335 TEXT runtimesettls(SB),NOSPLIT,$8
    336 	// adjust for ELF: wants to use -8(FS) for g
    337 	ADDQ	$8, DI			// arg 1 - ptr
    338 	MOVQ	$317, AX		// sys__lwp_setprivate
    339 	SYSCALL
    340 	JCC	2(PC)
    341 	MOVL	$0xf1, 0xf1		// crash
    342 	RET
    343 
    344 TEXT runtimesysctl(SB),NOSPLIT,$0
    345 	MOVQ	mib+0(FP), DI		// arg 1 - name
    346 	MOVL	miblen+8(FP), SI		// arg 2 - namelen
    347 	MOVQ	out+16(FP), DX		// arg 3 - oldp
    348 	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
    349 	MOVQ	dst+32(FP), R8		// arg 5 - newp
    350 	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
    351 	MOVQ	$202, AX		// sys___sysctl
    352 	SYSCALL
    353 	JCC 4(PC)
    354 	NEGQ	AX
    355 	MOVL	AX, ret+48(FP)
    356 	RET
    357 	MOVL	$0, AX
    358 	MOVL	AX, ret+48(FP)
    359 	RET
    360 
    361 // int32 runtimekqueue(void)
    362 TEXT runtimekqueue(SB),NOSPLIT,$0
    363 	MOVQ	$0, DI
    364 	MOVL	$344, AX
    365 	SYSCALL
    366 	JCC	2(PC)
    367 	NEGQ	AX
    368 	MOVL	AX, ret+0(FP)
    369 	RET
    370 
    371 // int32 runtimekevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
    372 TEXT runtimekevent(SB),NOSPLIT,$0
    373 	MOVL	kq+0(FP), DI
    374 	MOVQ	ch+8(FP), SI
    375 	MOVL	nch+16(FP), DX
    376 	MOVQ	ev+24(FP), R10
    377 	MOVL	nev+32(FP), R8
    378 	MOVQ	ts+40(FP), R9
    379 	MOVL	$435, AX
    380 	SYSCALL
    381 	JCC	2(PC)
    382 	NEGQ	AX
    383 	MOVL	AX, ret+48(FP)
    384 	RET
    385 
    386 // void runtimecloseonexec(int32 fd)
    387 TEXT runtimecloseonexec(SB),NOSPLIT,$0
    388 	MOVL	fd+0(FP), DI	// fd
    389 	MOVQ	$2, SI		// F_SETFD
    390 	MOVQ	$1, DX		// FD_CLOEXEC
    391 	MOVL	$92, AX		// fcntl
    392 	SYSCALL
    393 	RET
    394