Text file src/runtime/sys_linux_s390x.s

     1  // Copyright 2016 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 system stuff for Linux s390x; see
     6  // /usr/include/asm/unistd.h for the syscall number definitions.
     7  
     8  #include "go_asm.h"
     9  #include "go_tls.h"
    10  #include "textflag.h"
    11  
    12  #define SYS_exit                  1
    13  #define SYS_read                  3
    14  #define SYS_write                 4
    15  #define SYS_open                  5
    16  #define SYS_close                 6
    17  #define SYS_getpid               20
    18  #define SYS_kill                 37
    19  #define SYS_brk			 45
    20  #define SYS_mmap                 90
    21  #define SYS_munmap               91
    22  #define SYS_setitimer           104
    23  #define SYS_clone               120
    24  #define SYS_sched_yield         158
    25  #define SYS_nanosleep           162
    26  #define SYS_rt_sigreturn        173
    27  #define SYS_rt_sigaction        174
    28  #define SYS_rt_sigprocmask      175
    29  #define SYS_sigaltstack         186
    30  #define SYS_madvise             219
    31  #define SYS_mincore             218
    32  #define SYS_gettid              236
    33  #define SYS_futex               238
    34  #define SYS_sched_getaffinity   240
    35  #define SYS_tgkill              241
    36  #define SYS_exit_group          248
    37  #define SYS_timer_create        254
    38  #define SYS_timer_settime       255
    39  #define SYS_timer_delete        258
    40  #define SYS_clock_gettime       260
    41  #define SYS_pipe2		325
    42  
    43  TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
    44  	MOVW	code+0(FP), R2
    45  	MOVW	$SYS_exit_group, R1
    46  	SYSCALL
    47  	RET
    48  
    49  // func exitThread(wait *atomic.Uint32)
    50  TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
    51  	MOVD	wait+0(FP), R1
    52  	// We're done using the stack.
    53  	MOVW	$0, R2
    54  	MOVW	R2, (R1)
    55  	MOVW	$0, R2	// exit code
    56  	MOVW	$SYS_exit, R1
    57  	SYSCALL
    58  	JMP	0(PC)
    59  
    60  TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
    61  	MOVD	name+0(FP), R2
    62  	MOVW	mode+8(FP), R3
    63  	MOVW	perm+12(FP), R4
    64  	MOVW	$SYS_open, R1
    65  	SYSCALL
    66  	MOVD	$-4095, R3
    67  	CMPUBLT	R2, R3, 2(PC)
    68  	MOVW	$-1, R2
    69  	MOVW	R2, ret+16(FP)
    70  	RET
    71  
    72  TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
    73  	MOVW	fd+0(FP), R2
    74  	MOVW	$SYS_close, R1
    75  	SYSCALL
    76  	MOVD	$-4095, R3
    77  	CMPUBLT	R2, R3, 2(PC)
    78  	MOVW	$-1, R2
    79  	MOVW	R2, ret+8(FP)
    80  	RET
    81  
    82  TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
    83  	MOVD	fd+0(FP), R2
    84  	MOVD	p+8(FP), R3
    85  	MOVW	n+16(FP), R4
    86  	MOVW	$SYS_write, R1
    87  	SYSCALL
    88  	MOVW	R2, ret+24(FP)
    89  	RET
    90  
    91  TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
    92  	MOVW	fd+0(FP), R2
    93  	MOVD	p+8(FP), R3
    94  	MOVW	n+16(FP), R4
    95  	MOVW	$SYS_read, R1
    96  	SYSCALL
    97  	MOVW	R2, ret+24(FP)
    98  	RET
    99  
   100  // func pipe2() (r, w int32, errno int32)
   101  TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
   102  	MOVD	$r+8(FP), R2
   103  	MOVW	flags+0(FP), R3
   104  	MOVW	$SYS_pipe2, R1
   105  	SYSCALL
   106  	MOVW	R2, errno+16(FP)
   107  	RET
   108  
   109  TEXT runtime·usleep(SB),NOSPLIT,$16-4
   110  	MOVW	usec+0(FP), R2
   111  	MOVD	R2, R4
   112  	MOVW	$1000000, R3
   113  	DIVD	R3, R2
   114  	MOVD	R2, 8(R15)
   115  	MULLD	R2, R3		// Convert sec to usec and subtract
   116  	SUB	R3, R4
   117  	MOVW	$1000, R3
   118  	MULLD	R3, R4		// Convert remaining usec into nsec.
   119  	MOVD	R4, 16(R15)
   120  
   121  	// nanosleep(&ts, 0)
   122  	ADD	$8, R15, R2
   123  	MOVW	$0, R3
   124  	MOVW	$SYS_nanosleep, R1
   125  	SYSCALL
   126  	RET
   127  
   128  TEXT runtime·gettid(SB),NOSPLIT,$0-4
   129  	MOVW	$SYS_gettid, R1
   130  	SYSCALL
   131  	MOVW	R2, ret+0(FP)
   132  	RET
   133  
   134  TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
   135  	MOVW	$SYS_getpid, R1
   136  	SYSCALL
   137  	MOVW	R2, R10
   138  	MOVW	$SYS_gettid, R1
   139  	SYSCALL
   140  	MOVW	R2, R3	// arg 2 tid
   141  	MOVW	R10, R2	// arg 1 pid
   142  	MOVW	sig+0(FP), R4	// arg 2
   143  	MOVW	$SYS_tgkill, R1
   144  	SYSCALL
   145  	RET
   146  
   147  TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
   148  	MOVW	$SYS_getpid, R1
   149  	SYSCALL
   150  	MOVW	R2, R2	// arg 1 pid
   151  	MOVW	sig+0(FP), R3	// arg 2
   152  	MOVW	$SYS_kill, R1
   153  	SYSCALL
   154  	RET
   155  
   156  TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
   157  	MOVW	$SYS_getpid, R1
   158  	SYSCALL
   159  	MOVD	R2, ret+0(FP)
   160  	RET
   161  
   162  TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
   163  	MOVD	tgid+0(FP), R2
   164  	MOVD	tid+8(FP), R3
   165  	MOVD	sig+16(FP), R4
   166  	MOVW	$SYS_tgkill, R1
   167  	SYSCALL
   168  	RET
   169  
   170  TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
   171  	MOVW	mode+0(FP), R2
   172  	MOVD	new+8(FP), R3
   173  	MOVD	old+16(FP), R4
   174  	MOVW	$SYS_setitimer, R1
   175  	SYSCALL
   176  	RET
   177  
   178  TEXT runtime·timer_create(SB),NOSPLIT|NOFRAME,$0-28
   179  	MOVW	clockid+0(FP), R2
   180  	MOVD	sevp+8(FP), R3
   181  	MOVD	timerid+16(FP), R4
   182  	MOVW	$SYS_timer_create, R1
   183  	SYSCALL
   184  	MOVW	R2, ret+24(FP)
   185  	RET
   186  
   187  TEXT runtime·timer_settime(SB),NOSPLIT|NOFRAME,$0-28
   188  	MOVW	timerid+0(FP), R2
   189  	MOVW	flags+4(FP), R3
   190  	MOVD	new+8(FP), R4
   191  	MOVD	old+16(FP), R5
   192  	MOVW	$SYS_timer_settime, R1
   193  	SYSCALL
   194  	MOVW	R2, ret+24(FP)
   195  	RET
   196  
   197  TEXT runtime·timer_delete(SB),NOSPLIT|NOFRAME,$0-12
   198  	MOVW	timerid+0(FP), R2
   199  	MOVW	$SYS_timer_delete, R1
   200  	SYSCALL
   201  	MOVW	R2, ret+8(FP)
   202  	RET
   203  
   204  TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
   205  	MOVD	addr+0(FP), R2
   206  	MOVD	n+8(FP), R3
   207  	MOVD	dst+16(FP), R4
   208  	MOVW	$SYS_mincore, R1
   209  	SYSCALL
   210  	MOVW	R2, ret+24(FP)
   211  	RET
   212  
   213  // func walltime() (sec int64, nsec int32)
   214  TEXT runtime·walltime(SB),NOSPLIT,$32-12
   215  	MOVW	$0, R2			// CLOCK_REALTIME
   216  	MOVD	R15, R7			// Backup stack pointer
   217  
   218  	MOVD	g_m(g), R6		//m
   219  
   220  	MOVD	runtime·vdsoClockgettimeSym(SB), R9	// Check for VDSO availability
   221  	CMPBEQ	R9, $0, fallback
   222  
   223  	MOVD	m_vdsoPC(R6), R4
   224  	MOVD	R4, 16(R15)
   225  	MOVD	m_vdsoSP(R6), R4
   226  	MOVD	R4, 24(R15)
   227  
   228  	MOVD	R14, R8 		// Backup return address
   229  	MOVD	$sec+0(FP), R4 	// return parameter caller
   230  
   231  	MOVD	R8, m_vdsoPC(R6)
   232  	MOVD	R4, m_vdsoSP(R6)
   233  
   234  	MOVD	m_curg(R6), R5
   235  	CMP		g, R5
   236  	BNE		noswitch
   237  
   238  	MOVD	m_g0(R6), R4
   239  	MOVD	(g_sched+gobuf_sp)(R4), R15	// Set SP to g0 stack
   240  
   241  noswitch:
   242  	SUB		$16, R15		// reserve 2x 8 bytes for parameters
   243  	MOVD	$~7, R4			// align to 8 bytes because of gcc ABI
   244  	AND		R4, R15
   245  	MOVD	R15, R3			// R15 needs to be in R3 as expected by kernel_clock_gettime
   246  
   247  	MOVB	runtime·iscgo(SB),R12
   248  	CMPBNE	R12, $0, nosaveg
   249  
   250  	MOVD	m_gsignal(R6), R12	// g.m.gsignal
   251  	CMPBEQ	R12, $0, nosaveg
   252  
   253  	CMPBEQ	g, R12, nosaveg
   254  	MOVD	(g_stack+stack_lo)(R12), R12 // g.m.gsignal.stack.lo
   255  	MOVD	g, (R12)
   256  
   257  	BL	R9 // to vdso lookup
   258  
   259  	MOVD	$0, (R12)
   260  
   261  	JMP	finish
   262  
   263  nosaveg:
   264  	BL	R9					// to vdso lookup
   265  
   266  finish:
   267  	MOVD	0(R15), R3		// sec
   268  	MOVD	8(R15), R5		// nsec
   269  	MOVD	R7, R15			// Restore SP
   270  
   271  	// Restore vdsoPC, vdsoSP
   272  	// We don't worry about being signaled between the two stores.
   273  	// If we are not in a signal handler, we'll restore vdsoSP to 0,
   274  	// and no one will care about vdsoPC. If we are in a signal handler,
   275  	// we cannot receive another signal.
   276  	MOVD	24(R15), R12
   277  	MOVD	R12, m_vdsoSP(R6)
   278  	MOVD	16(R15), R12
   279  	MOVD	R12, m_vdsoPC(R6)
   280  
   281  return:
   282  	// sec is in R3, nsec in R5
   283  	// return nsec in R3
   284  	MOVD	R3, sec+0(FP)
   285  	MOVW	R5, nsec+8(FP)
   286  	RET
   287  
   288  	// Syscall fallback
   289  fallback:
   290  	MOVD	$tp-16(SP), R3
   291  	MOVW	$SYS_clock_gettime, R1
   292  	SYSCALL
   293  	LMG		tp-16(SP), R2, R3
   294  	// sec is in R2, nsec in R3
   295  	MOVD	R2, sec+0(FP)
   296  	MOVW	R3, nsec+8(FP)
   297  	RET
   298  
   299  TEXT runtime·nanotime1(SB),NOSPLIT,$32-8
   300  	MOVW	$1, R2			// CLOCK_MONOTONIC
   301  
   302  	MOVD	R15, R7			// Backup stack pointer
   303  
   304  	MOVD	g_m(g), R6		//m
   305  
   306  	MOVD	runtime·vdsoClockgettimeSym(SB), R9	// Check for VDSO availability
   307  	CMPBEQ	R9, $0, fallback
   308  
   309  	MOVD	m_vdsoPC(R6), R4
   310  	MOVD	R4, 16(R15)
   311  	MOVD	m_vdsoSP(R6), R4
   312  	MOVD	R4, 24(R15)
   313  
   314  	MOVD	R14, R8			// Backup return address
   315  	MOVD	$ret+0(FP), R4	// caller's SP
   316  
   317  	MOVD	R8, m_vdsoPC(R6)
   318  	MOVD	R4, m_vdsoSP(R6)
   319  
   320  	MOVD	m_curg(R6), R5
   321  	CMP		g, R5
   322  	BNE		noswitch
   323  
   324  	MOVD	m_g0(R6), R4
   325  	MOVD	(g_sched+gobuf_sp)(R4), R15	// Set SP to g0 stack
   326  
   327  noswitch:
   328  	SUB		$16, R15		// reserve 2x 8 bytes for parameters
   329  	MOVD	$~7, R4			// align to 8 bytes because of gcc ABI
   330  	AND		R4, R15
   331  	MOVD	R15, R3			// R15 needs to be in R3 as expected by kernel_clock_gettime
   332  
   333  	MOVB	runtime·iscgo(SB),R12
   334  	CMPBNE	R12, $0, nosaveg
   335  
   336  	MOVD	m_gsignal(R6), R12	// g.m.gsignal
   337  	CMPBEQ	R12, $0, nosaveg
   338  
   339  	CMPBEQ	g, R12, nosaveg
   340  	MOVD	(g_stack+stack_lo)(R12), R12	// g.m.gsignal.stack.lo
   341  	MOVD	g, (R12)
   342  
   343  	BL	R9 					// to vdso lookup
   344  
   345  	MOVD $0, (R12)
   346  
   347  	JMP	finish
   348  
   349  nosaveg:
   350  	BL	R9					// to vdso lookup
   351  
   352  finish:
   353  	MOVD	0(R15), R3		// sec
   354  	MOVD	8(R15), R5		// nsec
   355  	MOVD	R7, R15			// Restore SP
   356  
   357  	// Restore vdsoPC, vdsoSP
   358  	// We don't worry about being signaled between the two stores.
   359  	// If we are not in a signal handler, we'll restore vdsoSP to 0,
   360  	// and no one will care about vdsoPC. If we are in a signal handler,
   361  	// we cannot receive another signal.
   362  
   363  	MOVD	24(R15), R12
   364  	MOVD	R12, m_vdsoSP(R6)
   365  	MOVD	16(R15), R12
   366  	MOVD	R12, m_vdsoPC(R6)
   367  
   368  return:
   369  	// sec is in R3, nsec in R5
   370  	// return nsec in R3
   371  	MULLD	$1000000000, R3
   372  	ADD		R5, R3
   373  	MOVD	R3, ret+0(FP)
   374  	RET
   375  
   376  	// Syscall fallback
   377  fallback:
   378  	MOVD	$tp-16(SP), R3
   379  	MOVD	$SYS_clock_gettime, R1
   380  	SYSCALL
   381  	LMG		tp-16(SP), R2, R3
   382  	MOVD	R3, R5
   383  	MOVD	R2, R3
   384  	JMP	return
   385  
   386  TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
   387  	MOVW	how+0(FP), R2
   388  	MOVD	new+8(FP), R3
   389  	MOVD	old+16(FP), R4
   390  	MOVW	size+24(FP), R5
   391  	MOVW	$SYS_rt_sigprocmask, R1
   392  	SYSCALL
   393  	MOVD	$-4095, R3
   394  	CMPUBLT	R2, R3, 2(PC)
   395  	MOVD	R0, 0(R0) // crash
   396  	RET
   397  
   398  TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
   399  	MOVD	sig+0(FP), R2
   400  	MOVD	new+8(FP), R3
   401  	MOVD	old+16(FP), R4
   402  	MOVD	size+24(FP), R5
   403  	MOVW	$SYS_rt_sigaction, R1
   404  	SYSCALL
   405  	MOVW	R2, ret+32(FP)
   406  	RET
   407  
   408  TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
   409  	MOVW	sig+8(FP), R2
   410  	MOVD	info+16(FP), R3
   411  	MOVD	ctx+24(FP), R4
   412  	MOVD	fn+0(FP), R5
   413  	BL	R5
   414  	RET
   415  
   416  TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$64
   417  	// initialize essential registers (just in case)
   418  	XOR	R0, R0
   419  
   420  	// this might be called in external code context,
   421  	// where g is not set.
   422  	MOVB	runtime·iscgo(SB), R6
   423  	CMPBEQ	R6, $0, 2(PC)
   424  	BL	runtime·load_g(SB)
   425  
   426  	MOVW	R2, 8(R15)
   427  	MOVD	R3, 16(R15)
   428  	MOVD	R4, 24(R15)
   429  	MOVD	$runtime·sigtrampgo(SB), R5
   430  	BL	R5
   431  	RET
   432  
   433  TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
   434  	BR	runtime·sigtramp(SB)
   435  
   436  // func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) unsafe.Pointer
   437  TEXT runtime·mmap(SB),NOSPLIT,$48-48
   438  	MOVD	addr+0(FP), R2
   439  	MOVD	n+8(FP), R3
   440  	MOVW	prot+16(FP), R4
   441  	MOVW	flags+20(FP), R5
   442  	MOVW	fd+24(FP), R6
   443  	MOVWZ	off+28(FP), R7
   444  
   445  	// s390x uses old_mmap, so the arguments need to be placed into
   446  	// a struct and a pointer to the struct passed to mmap.
   447  	MOVD	R2, addr-48(SP)
   448  	MOVD	R3, n-40(SP)
   449  	MOVD	R4, prot-32(SP)
   450  	MOVD	R5, flags-24(SP)
   451  	MOVD	R6, fd-16(SP)
   452  	MOVD	R7, off-8(SP)
   453  
   454  	MOVD	$addr-48(SP), R2
   455  	MOVW	$SYS_mmap, R1
   456  	SYSCALL
   457  	MOVD	$-4095, R3
   458  	CMPUBLT	R2, R3, ok
   459  	NEG	R2
   460  	MOVD	$0, p+32(FP)
   461  	MOVD	R2, err+40(FP)
   462  	RET
   463  ok:
   464  	MOVD	R2, p+32(FP)
   465  	MOVD	$0, err+40(FP)
   466  	RET
   467  
   468  TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
   469  	MOVD	addr+0(FP), R2
   470  	MOVD	n+8(FP), R3
   471  	MOVW	$SYS_munmap, R1
   472  	SYSCALL
   473  	MOVD	$-4095, R3
   474  	CMPUBLT	R2, R3, 2(PC)
   475  	MOVD	R0, 0(R0) // crash
   476  	RET
   477  
   478  TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
   479  	MOVD	addr+0(FP), R2
   480  	MOVD	n+8(FP), R3
   481  	MOVW	flags+16(FP), R4
   482  	MOVW	$SYS_madvise, R1
   483  	SYSCALL
   484  	MOVW	R2, ret+24(FP)
   485  	RET
   486  
   487  // int64 futex(int32 *uaddr, int32 op, int32 val,
   488  //	struct timespec *timeout, int32 *uaddr2, int32 val2);
   489  TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
   490  	MOVD	addr+0(FP), R2
   491  	MOVW	op+8(FP), R3
   492  	MOVW	val+12(FP), R4
   493  	MOVD	ts+16(FP), R5
   494  	MOVD	addr2+24(FP), R6
   495  	MOVW	val3+32(FP),  R7
   496  	MOVW	$SYS_futex, R1
   497  	SYSCALL
   498  	MOVW	R2, ret+40(FP)
   499  	RET
   500  
   501  // int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
   502  TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
   503  	MOVW	flags+0(FP), R3
   504  	MOVD	stk+8(FP), R2
   505  
   506  	// Copy mp, gp, fn off parent stack for use by child.
   507  	// Careful: Linux system call clobbers ???.
   508  	MOVD	mp+16(FP), R7
   509  	MOVD	gp+24(FP), R8
   510  	MOVD	fn+32(FP), R9
   511  
   512  	MOVD	R7, -8(R2)
   513  	MOVD	R8, -16(R2)
   514  	MOVD	R9, -24(R2)
   515  	MOVD	$1234, R7
   516  	MOVD	R7, -32(R2)
   517  
   518  	SYSCALL $SYS_clone
   519  
   520  	// In parent, return.
   521  	CMPBEQ	R2, $0, 3(PC)
   522  	MOVW	R2, ret+40(FP)
   523  	RET
   524  
   525  	// In child, on new stack.
   526  	// initialize essential registers
   527  	XOR	R0, R0
   528  	MOVD	-32(R15), R7
   529  	CMP	R7, $1234
   530  	BEQ	2(PC)
   531  	MOVD	R0, 0(R0)
   532  
   533  	// Initialize m->procid to Linux tid
   534  	SYSCALL $SYS_gettid
   535  
   536  	MOVD	-24(R15), R9        // fn
   537  	MOVD	-16(R15), R8        // g
   538  	MOVD	-8(R15), R7         // m
   539  
   540  	CMPBEQ	R7, $0, nog
   541  	CMP	R8, $0
   542  	BEQ	nog
   543  
   544  	MOVD	R2, m_procid(R7)
   545  
   546  	// In child, set up new stack
   547  	MOVD	R7, g_m(R8)
   548  	MOVD	R8, g
   549  	//CALL	runtime·stackcheck(SB)
   550  
   551  nog:
   552  	// Call fn
   553  	BL	R9
   554  
   555  	// It shouldn't return.	 If it does, exit that thread.
   556  	MOVW	$111, R2
   557  	MOVW	$SYS_exit, R1
   558  	SYSCALL
   559  	BR	-2(PC)	// keep exiting
   560  
   561  TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
   562  	MOVD	new+0(FP), R2
   563  	MOVD	old+8(FP), R3
   564  	MOVW	$SYS_sigaltstack, R1
   565  	SYSCALL
   566  	MOVD	$-4095, R3
   567  	CMPUBLT	R2, R3, 2(PC)
   568  	MOVD	R0, 0(R0) // crash
   569  	RET
   570  
   571  TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
   572  	MOVW	$SYS_sched_yield, R1
   573  	SYSCALL
   574  	RET
   575  
   576  TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
   577  	MOVD	pid+0(FP), R2
   578  	MOVD	len+8(FP), R3
   579  	MOVD	buf+16(FP), R4
   580  	MOVW	$SYS_sched_getaffinity, R1
   581  	SYSCALL
   582  	MOVW	R2, ret+24(FP)
   583  	RET
   584  
   585  // func sbrk0() uintptr
   586  TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
   587  	// Implemented as brk(NULL).
   588  	MOVD	$0, R2
   589  	MOVW	$SYS_brk, R1
   590  	SYSCALL
   591  	MOVD	R2, ret+0(FP)
   592  	RET
   593  
   594  TEXT runtime·access(SB),$0-20
   595  	MOVD	$0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
   596  	MOVW	R0, ret+16(FP)
   597  	RET
   598  
   599  TEXT runtime·connect(SB),$0-28
   600  	MOVD	$0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
   601  	MOVW	R0, ret+24(FP)
   602  	RET
   603  
   604  TEXT runtime·socket(SB),$0-20
   605  	MOVD	$0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
   606  	MOVW	R0, ret+16(FP)
   607  	RET
   608  
   609  // func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
   610  TEXT runtime·vgetrandom1(SB),NOSPLIT,$16-48
   611  	MOVD	buf+0(FP), R2
   612  	MOVD	length+8(FP), R3
   613  	MOVW	flags+16(FP), R4
   614  	MOVD	state+24(FP), R5
   615  	MOVD	stateSize+32(FP), R6
   616  
   617  	MOVD	R15, R7
   618  
   619  	MOVD	runtime·vdsoGetrandomSym(SB), R1
   620  	MOVD	g_m(g), R9
   621  
   622  	MOVD	m_vdsoPC(R9), R12
   623  	MOVD	R12, 8(R15)
   624  	MOVD	m_vdsoSP(R9), R12
   625  	MOVD	R12, 16(R15)
   626  	MOVD	R14, m_vdsoPC(R9)
   627  	MOVD	$buf+0(FP), R12
   628  	MOVD	R12, m_vdsoSP(R9)
   629  
   630  	SUB	$160, R15
   631  	MOVD	$~7, R12
   632  	AND	R12, R15
   633  
   634  	MOVB	runtime·iscgo(SB), R12
   635  	CMPBNE	R12, $0, nosaveg
   636  	MOVD	m_gsignal(R9), R12
   637  	CMPBEQ	R12, $0, nosaveg
   638  	CMPBEQ	g, R12, nosaveg
   639  	MOVD	(g_stack+stack_lo)(R12), R12
   640  	MOVD	g, (R12)
   641  
   642  	BL	R1
   643  
   644  	MOVD	$0, (R12)
   645  	JMP	restore
   646  
   647  nosaveg:
   648  	BL	R1
   649  
   650  restore:
   651  	MOVD	R7, R15
   652  	MOVD	16(R15), R12
   653  	MOVD	R12, m_vdsoSP(R9)
   654  	MOVD	8(R15), R12
   655  	MOVD	R12, m_vdsoPC(R9)
   656  	MOVD	R2, ret+40(FP)
   657  	RET
   658  

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