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Text file src/runtime/sys_plan9_386.s

Documentation: runtime

     1  // Copyright 2010 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  #include "go_asm.h"
     6  #include "go_tls.h"
     7  #include "textflag.h"
     8  
     9  // setldt(int entry, int address, int limit)
    10  TEXT runtime·setldt(SB),NOSPLIT,$0
    11  	RET
    12  
    13  TEXT runtime·open(SB),NOSPLIT,$0
    14  	MOVL    $14, AX
    15  	INT     $64
    16  	MOVL	AX, ret+12(FP)
    17  	RET
    18  
    19  TEXT runtime·pread(SB),NOSPLIT,$0
    20  	MOVL    $50, AX
    21  	INT     $64
    22  	MOVL	AX, ret+20(FP)
    23  	RET
    24  
    25  TEXT runtime·pwrite(SB),NOSPLIT,$0
    26  	MOVL    $51, AX
    27  	INT     $64
    28  	MOVL	AX, ret+20(FP)
    29  	RET
    30  
    31  // int32 _seek(int64*, int32, int64, int32)
    32  TEXT _seek<>(SB),NOSPLIT,$0
    33  	MOVL	$39, AX
    34  	INT	$64
    35  	RET
    36  
    37  TEXT runtime·seek(SB),NOSPLIT,$24
    38  	LEAL	ret+16(FP), AX
    39  	MOVL	fd+0(FP), BX
    40  	MOVL	offset_lo+4(FP), CX
    41  	MOVL	offset_hi+8(FP), DX
    42  	MOVL	whence+12(FP), SI
    43  	MOVL	AX, 0(SP)
    44  	MOVL	BX, 4(SP)
    45  	MOVL	CX, 8(SP)
    46  	MOVL	DX, 12(SP)
    47  	MOVL	SI, 16(SP)
    48  	CALL	_seek<>(SB)
    49  	CMPL	AX, $0
    50  	JGE	3(PC)
    51  	MOVL	$-1, ret_lo+16(FP)
    52  	MOVL	$-1, ret_hi+20(FP)
    53  	RET
    54  
    55  TEXT runtime·closefd(SB),NOSPLIT,$0
    56  	MOVL	$4, AX
    57  	INT	$64
    58  	MOVL	AX, ret+4(FP)
    59  	RET
    60  
    61  TEXT runtime·exits(SB),NOSPLIT,$0
    62  	MOVL    $8, AX
    63  	INT     $64
    64  	RET
    65  
    66  TEXT runtime·brk_(SB),NOSPLIT,$0
    67  	MOVL    $24, AX
    68  	INT     $64
    69  	MOVL	AX, ret+4(FP)
    70  	RET
    71  
    72  TEXT runtime·sleep(SB),NOSPLIT,$0
    73  	MOVL    $17, AX
    74  	INT     $64
    75  	MOVL	AX, ret+4(FP)
    76  	RET
    77  
    78  TEXT runtime·plan9_semacquire(SB),NOSPLIT,$0
    79  	MOVL	$37, AX
    80  	INT	$64
    81  	MOVL	AX, ret+8(FP)
    82  	RET
    83  
    84  TEXT runtime·plan9_tsemacquire(SB),NOSPLIT,$0
    85  	MOVL	$52, AX
    86  	INT	$64
    87  	MOVL	AX, ret+8(FP)
    88  	RET
    89  
    90  TEXT nsec<>(SB),NOSPLIT,$0
    91  	MOVL	$53, AX
    92  	INT	$64
    93  	RET
    94  
    95  TEXT runtime·nsec(SB),NOSPLIT,$8
    96  	LEAL	ret+4(FP), AX
    97  	MOVL	AX, 0(SP)
    98  	CALL	nsec<>(SB)
    99  	CMPL	AX, $0
   100  	JGE	3(PC)
   101  	MOVL	$-1, ret_lo+4(FP)
   102  	MOVL	$-1, ret_hi+8(FP)
   103  	RET
   104  
   105  // func walltime() (sec int64, nsec int32)
   106  TEXT runtime·walltime(SB),NOSPLIT,$8-12
   107  	CALL	runtime·nanotime1(SB)
   108  	MOVL	0(SP), AX
   109  	MOVL	4(SP), DX
   110  
   111  	MOVL	$1000000000, CX
   112  	DIVL	CX
   113  	MOVL	AX, sec_lo+0(FP)
   114  	MOVL	$0, sec_hi+4(FP)
   115  	MOVL	DX, nsec+8(FP)
   116  	RET
   117  
   118  TEXT runtime·notify(SB),NOSPLIT,$0
   119  	MOVL	$28, AX
   120  	INT	$64
   121  	MOVL	AX, ret+4(FP)
   122  	RET
   123  
   124  TEXT runtime·noted(SB),NOSPLIT,$0
   125  	MOVL	$29, AX
   126  	INT	$64
   127  	MOVL	AX, ret+4(FP)
   128  	RET
   129  
   130  TEXT runtime·plan9_semrelease(SB),NOSPLIT,$0
   131  	MOVL	$38, AX
   132  	INT	$64
   133  	MOVL	AX, ret+8(FP)
   134  	RET
   135  
   136  TEXT runtime·rfork(SB),NOSPLIT,$0
   137  	MOVL	$19, AX
   138  	INT	$64
   139  	MOVL	AX, ret+4(FP)
   140  	RET
   141  
   142  TEXT runtime·tstart_plan9(SB),NOSPLIT,$4
   143  	MOVL	newm+0(FP), CX
   144  	MOVL	m_g0(CX), DX
   145  
   146  	// Layout new m scheduler stack on os stack.
   147  	MOVL	SP, AX
   148  	MOVL	AX, (g_stack+stack_hi)(DX)
   149  	SUBL	$(64*1024), AX		// stack size
   150  	MOVL	AX, (g_stack+stack_lo)(DX)
   151  	MOVL	AX, g_stackguard0(DX)
   152  	MOVL	AX, g_stackguard1(DX)
   153  
   154  	// Initialize procid from TOS struct.
   155  	MOVL	_tos(SB), AX
   156  	MOVL	48(AX), AX
   157  	MOVL	AX, m_procid(CX)	// save pid as m->procid
   158  
   159  	// Finally, initialize g.
   160  	get_tls(BX)
   161  	MOVL	DX, g(BX)
   162  
   163  	CALL	runtime·stackcheck(SB)	// smashes AX, CX
   164  	CALL	runtime·mstart(SB)
   165  
   166  	// Exit the thread.
   167  	MOVL	$0, 0(SP)
   168  	CALL	runtime·exits(SB)
   169  	JMP	0(PC)
   170  
   171  // void sigtramp(void *ureg, int8 *note)
   172  TEXT runtime·sigtramp(SB),NOSPLIT,$0
   173  	get_tls(AX)
   174  
   175  	// check that g exists
   176  	MOVL	g(AX), BX
   177  	CMPL	BX, $0
   178  	JNE	3(PC)
   179  	CALL	runtime·badsignal2(SB) // will exit
   180  	RET
   181  
   182  	// save args
   183  	MOVL	ureg+0(FP), CX
   184  	MOVL	note+4(FP), DX
   185  
   186  	// change stack
   187  	MOVL	g_m(BX), BX
   188  	MOVL	m_gsignal(BX), BP
   189  	MOVL	(g_stack+stack_hi)(BP), BP
   190  	MOVL	BP, SP
   191  
   192  	// make room for args and g
   193  	SUBL	$24, SP
   194  
   195  	// save g
   196  	MOVL	g(AX), BP
   197  	MOVL	BP, 20(SP)
   198  
   199  	// g = m->gsignal
   200  	MOVL	m_gsignal(BX), DI
   201  	MOVL	DI, g(AX)
   202  
   203  	// load args and call sighandler
   204  	MOVL	CX, 0(SP)
   205  	MOVL	DX, 4(SP)
   206  	MOVL	BP, 8(SP)
   207  
   208  	CALL	runtime·sighandler(SB)
   209  	MOVL	12(SP), AX
   210  
   211  	// restore g
   212  	get_tls(BX)
   213  	MOVL	20(SP), BP
   214  	MOVL	BP, g(BX)
   215  
   216  	// call noted(AX)
   217  	MOVL	AX, 0(SP)
   218  	CALL	runtime·noted(SB)
   219  	RET
   220  
   221  // Only used by the 64-bit runtime.
   222  TEXT runtime·setfpmasks(SB),NOSPLIT,$0
   223  	RET
   224  
   225  #define ERRMAX 128	/* from os_plan9.h */
   226  
   227  // void errstr(int8 *buf, int32 len)
   228  TEXT errstr<>(SB),NOSPLIT,$0
   229  	MOVL    $41, AX
   230  	INT     $64
   231  	RET
   232  
   233  // func errstr() string
   234  // Only used by package syscall.
   235  // Grab error string due to a syscall made
   236  // in entersyscall mode, without going
   237  // through the allocator (issue 4994).
   238  // See ../syscall/asm_plan9_386.s:/·Syscall/
   239  TEXT runtime·errstr(SB),NOSPLIT,$8-8
   240  	get_tls(AX)
   241  	MOVL	g(AX), BX
   242  	MOVL	g_m(BX), BX
   243  	MOVL	(m_mOS+mOS_errstr)(BX), CX
   244  	MOVL	CX, 0(SP)
   245  	MOVL	$ERRMAX, 4(SP)
   246  	CALL	errstr<>(SB)
   247  	CALL	runtime·findnull(SB)
   248  	MOVL	4(SP), AX
   249  	MOVL	AX, ret_len+4(FP)
   250  	MOVL	0(SP), AX
   251  	MOVL	AX, ret_base+0(FP)
   252  	RET
   253  

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