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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 #include "go_asm.h"
      6 #include "go_tls.h"
      7 #include "textflag.h"
      8 
      9 // void runtimeasmstdcall(void *c);
     10 TEXT runtimeasmstdcall(SB),NOSPLIT,$0
     11 	MOVL	fn+0(FP), BX
     12 
     13 	// SetLastError(0).
     14 	MOVL	$0, 0x34(FS)
     15 
     16 	// Copy args to the stack.
     17 	MOVL	SP, BP
     18 	MOVL	libcall_n(BX), CX	// words
     19 	MOVL	CX, AX
     20 	SALL	$2, AX
     21 	SUBL	AX, SP			// room for args
     22 	MOVL	SP, DI
     23 	MOVL	libcall_args(BX), SI
     24 	CLD
     25 	REP; MOVSL
     26 
     27 	// Call stdcall or cdecl function.
     28 	// DI SI BP BX are preserved, SP is not
     29 	CALL	libcall_fn(BX)
     30 	MOVL	BP, SP
     31 
     32 	// Return result.
     33 	MOVL	fn+0(FP), BX
     34 	MOVL	AX, libcall_r1(BX)
     35 	MOVL	DX, libcall_r2(BX)
     36 
     37 	// GetLastError().
     38 	MOVL	0x34(FS), AX
     39 	MOVL	AX, libcall_err(BX)
     40 
     41 	RET
     42 
     43 TEXT	runtimebadsignal2(SB),NOSPLIT,$24
     44 	// stderr
     45 	MOVL	$-12, 0(SP)
     46 	MOVL	SP, BP
     47 	CALL	*runtime_GetStdHandle(SB)
     48 	MOVL	BP, SP
     49 
     50 	MOVL	AX, 0(SP)	// handle
     51 	MOVL	$runtimebadsignalmsg(SB), DX // pointer
     52 	MOVL	DX, 4(SP)
     53 	MOVL	runtimebadsignallen(SB), DX // count
     54 	MOVL	DX, 8(SP)
     55 	LEAL	20(SP), DX  // written count
     56 	MOVL	$0, 0(DX)
     57 	MOVL	DX, 12(SP)
     58 	MOVL	$0, 16(SP) // overlapped
     59 	CALL	*runtime_WriteFile(SB)
     60 	MOVL	BP, SI
     61 	RET
     62 
     63 // faster get/set last error
     64 TEXT runtimegetlasterror(SB),NOSPLIT,$0
     65 	MOVL	0x34(FS), AX
     66 	MOVL	AX, ret+0(FP)
     67 	RET
     68 
     69 TEXT runtimesetlasterror(SB),NOSPLIT,$0
     70 	MOVL	err+0(FP), AX
     71 	MOVL	AX, 0x34(FS)
     72 	RET
     73 
     74 // Called by Windows as a Vectored Exception Handler (VEH).
     75 // First argument is pointer to struct containing
     76 // exception record and context pointers.
     77 // Handler function is stored in AX.
     78 // Return 0 for 'not handled', -1 for handled.
     79 TEXT runtimesigtramp(SB),NOSPLIT,$0-0
     80 	MOVL	ptrs+0(FP), CX
     81 	SUBL	$40, SP
     82 
     83 	// save callee-saved registers
     84 	MOVL	BX, 28(SP)
     85 	MOVL	BP, 16(SP)
     86 	MOVL	SI, 20(SP)
     87 	MOVL	DI, 24(SP)
     88 
     89 	MOVL	AX, SI	// save handler address
     90 
     91 	// find g
     92 	get_tls(DX)
     93 	CMPL	DX, $0
     94 	JNE	3(PC)
     95 	MOVL	$0, AX // continue
     96 	JMP	done
     97 	MOVL	g(DX), DX
     98 	CMPL	DX, $0
     99 	JNE	2(PC)
    100 	CALL	runtimebadsignal2(SB)
    101 
    102 	// save g and SP in case of stack switch
    103 	MOVL	DX, 32(SP)	// g
    104 	MOVL	SP, 36(SP)
    105 
    106 	// do we need to switch to the g0 stack?
    107 	MOVL	g_m(DX), BX
    108 	MOVL	m_g0(BX), BX
    109 	CMPL	DX, BX
    110 	JEQ	g0
    111 
    112 	// switch to the g0 stack
    113 	get_tls(BP)
    114 	MOVL	BX, g(BP)
    115 	MOVL	(g_sched+gobuf_sp)(BX), DI
    116 	// make it look like mstart called us on g0, to stop traceback
    117 	SUBL	$4, DI
    118 	MOVL	$runtimemstart(SB), 0(DI)
    119 	// traceback will think that we've done SUBL
    120 	// on this stack, so subtract them here to match.
    121 	// (we need room for sighandler arguments anyway).
    122 	// and re-save old SP for restoring later.
    123 	SUBL	$40, DI
    124 	MOVL	SP, 36(DI)
    125 	MOVL	DI, SP
    126 
    127 g0:
    128 	MOVL	0(CX), BX // ExceptionRecord*
    129 	MOVL	4(CX), CX // Context*
    130 	MOVL	BX, 0(SP)
    131 	MOVL	CX, 4(SP)
    132 	MOVL	DX, 8(SP)
    133 	CALL	SI	// call handler
    134 	// AX is set to report result back to Windows
    135 	MOVL	12(SP), AX
    136 
    137 	// switch back to original stack and g
    138 	// no-op if we never left.
    139 	MOVL	36(SP), SP
    140 	MOVL	32(SP), DX
    141 	get_tls(BP)
    142 	MOVL	DX, g(BP)
    143 
    144 done:
    145 	// restore callee-saved registers
    146 	MOVL	24(SP), DI
    147 	MOVL	20(SP), SI
    148 	MOVL	16(SP), BP
    149 	MOVL	28(SP), BX
    150 
    151 	ADDL	$40, SP
    152 	// RET 4 (return and pop 4 bytes parameters)
    153 	BYTE $0xC2; WORD $4
    154 	RET // unreached; make assembler happy
    155 
    156 TEXT runtimeexceptiontramp(SB),NOSPLIT,$0
    157 	MOVL	$runtimeexceptionhandler(SB), AX
    158 	JMP	runtimesigtramp(SB)
    159 
    160 TEXT runtimefirstcontinuetramp(SB),NOSPLIT,$0-0
    161 	// is never called
    162 	INT	$3
    163 
    164 TEXT runtimelastcontinuetramp(SB),NOSPLIT,$0-0
    165 	MOVL	$runtimelastcontinuehandler(SB), AX
    166 	JMP	runtimesigtramp(SB)
    167 
    168 TEXT runtimectrlhandler(SB),NOSPLIT,$0
    169 	PUSHL	$runtimectrlhandler1(SB)
    170 	CALL	runtimeexternalthreadhandler(SB)
    171 	MOVL	4(SP), CX
    172 	ADDL	$12, SP
    173 	JMP	CX
    174 
    175 TEXT runtimeprofileloop(SB),NOSPLIT,$0
    176 	PUSHL	$runtimeprofileloop1(SB)
    177 	CALL	runtimeexternalthreadhandler(SB)
    178 	MOVL	4(SP), CX
    179 	ADDL	$12, SP
    180 	JMP	CX
    181 
    182 TEXT runtimeexternalthreadhandler(SB),NOSPLIT,$0
    183 	PUSHL	BP
    184 	MOVL	SP, BP
    185 	PUSHL	BX
    186 	PUSHL	SI
    187 	PUSHL	DI
    188 	PUSHL	0x14(FS)
    189 	MOVL	SP, DX
    190 
    191 	// setup dummy m, g
    192 	SUBL	$m__size, SP		// space for M
    193 	MOVL	SP, 0(SP)
    194 	MOVL	$m__size, 4(SP)
    195 	CALL	runtimememclr(SB)	// smashes AX,BX,CX
    196 
    197 	LEAL	m_tls(SP), CX
    198 	MOVL	CX, 0x14(FS)
    199 	MOVL	SP, BX
    200 	SUBL	$g__size, SP		// space for G
    201 	MOVL	SP, g(CX)
    202 	MOVL	SP, m_g0(BX)
    203 
    204 	MOVL	SP, 0(SP)
    205 	MOVL	$g__size, 4(SP)
    206 	CALL	runtimememclr(SB)	// smashes AX,BX,CX
    207 	LEAL	g__size(SP), BX
    208 	MOVL	BX, g_m(SP)
    209 	LEAL	-8192(SP), CX
    210 	MOVL	CX, (g_stack+stack_lo)(SP)
    211 	ADDL	$const__StackGuard, CX
    212 	MOVL	CX, g_stackguard0(SP)
    213 	MOVL	CX, g_stackguard1(SP)
    214 	MOVL	DX, (g_stack+stack_hi)(SP)
    215 
    216 	PUSHL	AX			// room for return value
    217 	PUSHL	16(BP)			// arg for handler
    218 	CALL	8(BP)
    219 	POPL	CX
    220 	POPL	AX			// pass return value to Windows in AX
    221 
    222 	get_tls(CX)
    223 	MOVL	g(CX), CX
    224 	MOVL	(g_stack+stack_hi)(CX), SP
    225 	POPL	0x14(FS)
    226 	POPL	DI
    227 	POPL	SI
    228 	POPL	BX
    229 	POPL	BP
    230 	RET
    231 
    232 GLOBL runtimecbctxts(SB), NOPTR, $4
    233 
    234 TEXT runtimecallbackasm1+0(SB),NOSPLIT,$0
    235   	MOVL	0(SP), AX	// will use to find our callback context
    236 
    237 	// remove return address from stack, we are not returning there
    238 	ADDL	$4, SP
    239 
    240 	// address to callback parameters into CX
    241 	LEAL	4(SP), CX
    242 
    243 	// save registers as required for windows callback
    244 	PUSHL	DI
    245 	PUSHL	SI
    246 	PUSHL	BP
    247 	PUSHL	BX
    248 
    249 	// determine index into runtimecbctxts table
    250 	SUBL	$runtimecallbackasm(SB), AX
    251 	MOVL	$0, DX
    252 	MOVL	$5, BX	// divide by 5 because each call instruction in runtimecallbacks is 5 bytes long
    253 	DIVL	BX
    254 
    255 	// find correspondent runtimecbctxts table entry
    256 	MOVL	runtimecbctxts(SB), BX
    257 	MOVL	-4(BX)(AX*4), BX
    258 
    259 	// extract callback context
    260 	MOVL	wincallbackcontext_gobody(BX), AX
    261 	MOVL	wincallbackcontext_argsize(BX), DX
    262 
    263 	// preserve whatever's at the memory location that
    264 	// the callback will use to store the return value
    265 	PUSHL	0(CX)(DX*1)
    266 
    267 	// extend argsize by size of return value
    268 	ADDL	$4, DX
    269 
    270 	// remember how to restore stack on return
    271 	MOVL	wincallbackcontext_restorestack(BX), BX
    272 	PUSHL	BX
    273 
    274 	// call target Go function
    275 	PUSHL	DX			// argsize (including return value)
    276 	PUSHL	CX			// callback parameters
    277 	PUSHL	AX			// address of target Go function
    278 	CLD
    279 	CALL	runtimecgocallback_gofunc(SB)
    280 	POPL	AX
    281 	POPL	CX
    282 	POPL	DX
    283 
    284 	// how to restore stack on return
    285 	POPL	BX
    286 
    287 	// return value into AX (as per Windows spec)
    288 	// and restore previously preserved value
    289 	MOVL	-4(CX)(DX*1), AX
    290 	POPL	-4(CX)(DX*1)
    291 
    292 	MOVL	BX, CX			// cannot use BX anymore
    293 
    294 	// restore registers as required for windows callback
    295 	POPL	BX
    296 	POPL	BP
    297 	POPL	SI
    298 	POPL	DI
    299 
    300 	// remove callback parameters before return (as per Windows spec)
    301 	POPL	DX
    302 	ADDL	CX, SP
    303 	PUSHL	DX
    304 
    305 	CLD
    306 
    307 	RET
    308 
    309 // void tstart(M *newm);
    310 TEXT runtimetstart(SB),NOSPLIT,$0
    311 	MOVL	newm+4(SP), CX		// m
    312 	MOVL	m_g0(CX), DX		// g
    313 
    314 	// Layout new m scheduler stack on os stack.
    315 	MOVL	SP, AX
    316 	MOVL	AX, (g_stack+stack_hi)(DX)
    317 	SUBL	$(64*1024), AX		// stack size
    318 	MOVL	AX, (g_stack+stack_lo)(DX)
    319 	ADDL	$const__StackGuard, AX
    320 	MOVL	AX, g_stackguard0(DX)
    321 	MOVL	AX, g_stackguard1(DX)
    322 
    323 	// Set up tls.
    324 	LEAL	m_tls(CX), SI
    325 	MOVL	SI, 0x14(FS)
    326 	MOVL	CX, g_m(DX)
    327 	MOVL	DX, g(SI)
    328 
    329 	// Someday the convention will be D is always cleared.
    330 	CLD
    331 
    332 	CALL	runtimestackcheck(SB)	// clobbers AX,CX
    333 	CALL	runtimemstart(SB)
    334 
    335 	RET
    336 
    337 // uint32 tstart_stdcall(M *newm);
    338 TEXT runtimetstart_stdcall(SB),NOSPLIT,$0
    339 	MOVL	newm+4(SP), BX
    340 
    341 	PUSHL	BX
    342 	CALL	runtimetstart(SB)
    343 	POPL	BX
    344 
    345 	// Adjust stack for stdcall to return properly.
    346 	MOVL	(SP), AX		// save return address
    347 	ADDL	$4, SP			// remove single parameter
    348 	MOVL	AX, (SP)		// restore return address
    349 
    350 	XORL	AX, AX			// return 0 == success
    351 
    352 	RET
    353 
    354 // setldt(int entry, int address, int limit)
    355 TEXT runtimesetldt(SB),NOSPLIT,$0
    356 	MOVL	address+4(FP), CX
    357 	MOVL	CX, 0x14(FS)
    358 	RET
    359 
    360 // Sleep duration is in 100ns units.
    361 TEXT runtimeusleep1(SB),NOSPLIT,$0
    362 	MOVL	usec+0(FP), BX
    363 	MOVL	$runtimeusleep2(SB), AX // to hide from 8l
    364 
    365 	// Execute call on m->g0 stack, in case we are not actually
    366 	// calling a system call wrapper, like when running under WINE.
    367 	get_tls(CX)
    368 	CMPL	CX, $0
    369 	JNE	3(PC)
    370 	// Not a Go-managed thread. Do not switch stack.
    371 	CALL	AX
    372 	RET
    373 
    374 	MOVL	g(CX), BP
    375 	MOVL	g_m(BP), BP
    376 
    377 	// leave pc/sp for cpu profiler
    378 	MOVL	(SP), SI
    379 	MOVL	SI, m_libcallpc(BP)
    380 	MOVL	g(CX), SI
    381 	MOVL	SI, m_libcallg(BP)
    382 	// sp must be the last, because once async cpu profiler finds
    383 	// all three values to be non-zero, it will use them
    384 	LEAL	usec+0(FP), SI
    385 	MOVL	SI, m_libcallsp(BP)
    386 
    387 	MOVL	m_g0(BP), SI
    388 	CMPL	g(CX), SI
    389 	JNE	switch
    390 	// executing on m->g0 already
    391 	CALL	AX
    392 	JMP	ret
    393 
    394 switch:
    395 	// Switch to m->g0 stack and back.
    396 	MOVL	(g_sched+gobuf_sp)(SI), SI
    397 	MOVL	SP, -4(SI)
    398 	LEAL	-4(SI), SP
    399 	CALL	AX
    400 	MOVL	0(SP), SP
    401 
    402 ret:
    403 	get_tls(CX)
    404 	MOVL	g(CX), BP
    405 	MOVL	g_m(BP), BP
    406 	MOVL	$0, m_libcallsp(BP)
    407 	RET
    408 
    409 // Runs on OS stack. duration (in 100ns units) is in BX.
    410 TEXT runtimeusleep2(SB),NOSPLIT,$20
    411 	// Want negative 100ns units.
    412 	NEGL	BX
    413 	MOVL	$-1, hi-4(SP)
    414 	MOVL	BX, lo-8(SP)
    415 	LEAL	lo-8(SP), BX
    416 	MOVL	BX, ptime-12(SP)
    417 	MOVL	$0, alertable-16(SP)
    418 	MOVL	$-1, handle-20(SP)
    419 	MOVL	SP, BP
    420 	MOVL	runtime_NtWaitForSingleObject(SB), AX
    421 	CALL	AX
    422 	MOVL	BP, SP
    423 	RET
    424 
    425 // func now() (sec int64, nsec int32)
    426 TEXT timenow(SB),NOSPLIT,$8-12
    427 	CALL	runtimeunixnano(SB)
    428 	MOVL	0(SP), AX
    429 	MOVL	4(SP), DX
    430 
    431 	MOVL	$1000000000, CX
    432 	DIVL	CX
    433 	MOVL	AX, sec+0(FP)
    434 	MOVL	$0, sec+4(FP)
    435 	MOVL	DX, nsec+8(FP)
    436 	RET
    437