Current File : //usr/local/go/src/runtime/sys_windows_386.s
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "time_windows.h"
// void runtime·asmstdcall(void *c);
TEXT runtime·asmstdcall<ABIInternal>(SB),NOSPLIT,$0
MOVL fn+0(FP), BX
// SetLastError(0).
MOVL $0, 0x34(FS)
// Copy args to the stack.
MOVL SP, BP
MOVL libcall_n(BX), CX // words
MOVL CX, AX
SALL $2, AX
SUBL AX, SP // room for args
MOVL SP, DI
MOVL libcall_args(BX), SI
CLD
REP; MOVSL
// Call stdcall or cdecl function.
// DI SI BP BX are preserved, SP is not
CALL libcall_fn(BX)
MOVL BP, SP
// Return result.
MOVL fn+0(FP), BX
MOVL AX, libcall_r1(BX)
MOVL DX, libcall_r2(BX)
// GetLastError().
MOVL 0x34(FS), AX
MOVL AX, libcall_err(BX)
RET
TEXT runtime·badsignal2(SB),NOSPLIT,$24
// stderr
MOVL $-12, 0(SP)
MOVL SP, BP
CALL *runtime·_GetStdHandle(SB)
MOVL BP, SP
MOVL AX, 0(SP) // handle
MOVL $runtime·badsignalmsg(SB), DX // pointer
MOVL DX, 4(SP)
MOVL runtime·badsignallen(SB), DX // count
MOVL DX, 8(SP)
LEAL 20(SP), DX // written count
MOVL $0, 0(DX)
MOVL DX, 12(SP)
MOVL $0, 16(SP) // overlapped
CALL *runtime·_WriteFile(SB)
// Does not return.
CALL runtime·abort(SB)
RET
// faster get/set last error
TEXT runtime·getlasterror(SB),NOSPLIT,$0
MOVL 0x34(FS), AX
MOVL AX, ret+0(FP)
RET
// Called by Windows as a Vectored Exception Handler (VEH).
// First argument is pointer to struct containing
// exception record and context pointers.
// Handler function is stored in AX.
// Return 0 for 'not handled', -1 for handled.
TEXT sigtramp<>(SB),NOSPLIT,$0-0
MOVL ptrs+0(FP), CX
SUBL $40, SP
// save callee-saved registers
MOVL BX, 28(SP)
MOVL BP, 16(SP)
MOVL SI, 20(SP)
MOVL DI, 24(SP)
MOVL AX, SI // save handler address
// find g
get_tls(DX)
CMPL DX, $0
JNE 3(PC)
MOVL $0, AX // continue
JMP done
MOVL g(DX), DX
CMPL DX, $0
JNE 2(PC)
CALL runtime·badsignal2(SB)
// save g in case of stack switch
MOVL DX, 32(SP) // g
MOVL SP, 36(SP)
// do we need to switch to the g0 stack?
MOVL g_m(DX), BX
MOVL m_g0(BX), BX
CMPL DX, BX
JEQ g0
// switch to the g0 stack
get_tls(BP)
MOVL BX, g(BP)
MOVL (g_sched+gobuf_sp)(BX), DI
// make room for sighandler arguments
// and re-save old SP for restoring later.
// (note that the 36(DI) here must match the 36(SP) above.)
SUBL $40, DI
MOVL SP, 36(DI)
MOVL DI, SP
g0:
MOVL 0(CX), BX // ExceptionRecord*
MOVL 4(CX), CX // Context*
MOVL BX, 0(SP)
MOVL CX, 4(SP)
MOVL DX, 8(SP)
CALL SI // call handler
// AX is set to report result back to Windows
MOVL 12(SP), AX
// switch back to original stack and g
// no-op if we never left.
MOVL 36(SP), SP
MOVL 32(SP), DX // note: different SP
get_tls(BP)
MOVL DX, g(BP)
done:
// restore callee-saved registers
MOVL 24(SP), DI
MOVL 20(SP), SI
MOVL 16(SP), BP
MOVL 28(SP), BX
ADDL $40, SP
// RET 4 (return and pop 4 bytes parameters)
BYTE $0xC2; WORD $4
RET // unreached; make assembler happy
TEXT runtime·exceptiontramp<ABIInternal>(SB),NOSPLIT,$0
MOVL $runtime·exceptionhandler(SB), AX
JMP sigtramp<>(SB)
TEXT runtime·firstcontinuetramp<ABIInternal>(SB),NOSPLIT,$0-0
// is never called
INT $3
TEXT runtime·lastcontinuetramp<ABIInternal>(SB),NOSPLIT,$0-0
MOVL $runtime·lastcontinuehandler(SB), AX
JMP sigtramp<>(SB)
GLOBL runtime·cbctxts(SB), NOPTR, $4
TEXT runtime·callbackasm1<ABIInternal>(SB),NOSPLIT,$0
MOVL 0(SP), AX // will use to find our callback context
// remove return address from stack, we are not returning to callbackasm, but to its caller.
ADDL $4, SP
// address to callback parameters into CX
LEAL 4(SP), CX
// save registers as required for windows callback
PUSHL DI
PUSHL SI
PUSHL BP
PUSHL BX
// Go ABI requires DF flag to be cleared.
CLD
// determine index into runtime·cbs table
SUBL $runtime·callbackasm<ABIInternal>(SB), AX
MOVL $0, DX
MOVL $5, BX // divide by 5 because each call instruction in runtime·callbacks is 5 bytes long
DIVL BX
SUBL $1, AX // subtract 1 because return PC is to the next slot
// Create a struct callbackArgs on our stack.
SUBL $(12+callbackArgs__size), SP
MOVL AX, (12+callbackArgs_index)(SP) // callback index
MOVL CX, (12+callbackArgs_args)(SP) // address of args vector
MOVL $0, (12+callbackArgs_result)(SP) // result
LEAL 12(SP), AX // AX = &callbackArgs{...}
// Call cgocallback, which will call callbackWrap(frame).
MOVL $0, 8(SP) // context
MOVL AX, 4(SP) // frame (address of callbackArgs)
LEAL ·callbackWrap(SB), AX
MOVL AX, 0(SP) // PC of function to call
CALL runtime·cgocallback(SB)
// Get callback result.
MOVL (12+callbackArgs_result)(SP), AX
// Get popRet.
MOVL (12+callbackArgs_retPop)(SP), CX // Can't use a callee-save register
ADDL $(12+callbackArgs__size), SP
// restore registers as required for windows callback
POPL BX
POPL BP
POPL SI
POPL DI
// remove callback parameters before return (as per Windows spec)
POPL DX
ADDL CX, SP
PUSHL DX
CLD
RET
// void tstart(M *newm);
TEXT tstart<>(SB),NOSPLIT,$0
MOVL newm+0(FP), CX // m
MOVL m_g0(CX), DX // g
// Layout new m scheduler stack on os stack.
MOVL SP, AX
MOVL AX, (g_stack+stack_hi)(DX)
SUBL $(64*1024), AX // initial stack size (adjusted later)
MOVL AX, (g_stack+stack_lo)(DX)
ADDL $const__StackGuard, AX
MOVL AX, g_stackguard0(DX)
MOVL AX, g_stackguard1(DX)
// Set up tls.
LEAL m_tls(CX), SI
MOVL SI, 0x14(FS)
MOVL CX, g_m(DX)
MOVL DX, g(SI)
// Someday the convention will be D is always cleared.
CLD
CALL runtime·stackcheck(SB) // clobbers AX,CX
CALL runtime·mstart(SB)
RET
// uint32 tstart_stdcall(M *newm);
TEXT runtime·tstart_stdcall<ABIInternal>(SB),NOSPLIT,$0
MOVL newm+0(FP), BX
PUSHL BX
CALL tstart<>(SB)
POPL BX
// Adjust stack for stdcall to return properly.
MOVL (SP), AX // save return address
ADDL $4, SP // remove single parameter
MOVL AX, (SP) // restore return address
XORL AX, AX // return 0 == success
RET
// setldt(int entry, int address, int limit)
TEXT runtime·setldt(SB),NOSPLIT,$0
MOVL base+4(FP), CX
MOVL CX, 0x14(FS)
RET
// Runs on OS stack.
// duration (in -100ns units) is in dt+0(FP).
// g may be nil.
TEXT runtime·usleep2(SB),NOSPLIT,$20-4
MOVL dt+0(FP), BX
MOVL $-1, hi-4(SP)
MOVL BX, lo-8(SP)
LEAL lo-8(SP), BX
MOVL BX, ptime-12(SP)
MOVL $0, alertable-16(SP)
MOVL $-1, handle-20(SP)
MOVL SP, BP
MOVL runtime·_NtWaitForSingleObject(SB), AX
CALL AX
MOVL BP, SP
RET
// Runs on OS stack.
// duration (in -100ns units) is in dt+0(FP).
// g is valid.
TEXT runtime·usleep2HighRes(SB),NOSPLIT,$36-4
MOVL dt+0(FP), BX
MOVL $-1, hi-4(SP)
MOVL BX, lo-8(SP)
get_tls(CX)
MOVL g(CX), CX
MOVL g_m(CX), CX
MOVL (m_mOS+mOS_highResTimer)(CX), CX
MOVL CX, saved_timer-12(SP)
MOVL $0, fResume-16(SP)
MOVL $0, lpArgToCompletionRoutine-20(SP)
MOVL $0, pfnCompletionRoutine-24(SP)
MOVL $0, lPeriod-28(SP)
LEAL lo-8(SP), BX
MOVL BX, lpDueTime-32(SP)
MOVL CX, hTimer-36(SP)
MOVL SP, BP
MOVL runtime·_SetWaitableTimer(SB), AX
CALL AX
MOVL BP, SP
MOVL $0, ptime-28(SP)
MOVL $0, alertable-32(SP)
MOVL saved_timer-12(SP), CX
MOVL CX, handle-36(SP)
MOVL SP, BP
MOVL runtime·_NtWaitForSingleObject(SB), AX
CALL AX
MOVL BP, SP
RET
// Runs on OS stack.
TEXT runtime·switchtothread(SB),NOSPLIT,$0
MOVL SP, BP
MOVL runtime·_SwitchToThread(SB), AX
CALL AX
MOVL BP, SP
RET
TEXT runtime·nanotime1(SB),NOSPLIT,$0-8
CMPB runtime·useQPCTime(SB), $0
JNE useQPC
loop:
MOVL (_INTERRUPT_TIME+time_hi1), AX
MOVL (_INTERRUPT_TIME+time_lo), CX
MOVL (_INTERRUPT_TIME+time_hi2), DI
CMPL AX, DI
JNE loop
// wintime = DI:CX, multiply by 100
MOVL $100, AX
MULL CX
IMULL $100, DI
ADDL DI, DX
// wintime*100 = DX:AX
MOVL AX, ret_lo+0(FP)
MOVL DX, ret_hi+4(FP)
RET
useQPC:
JMP runtime·nanotimeQPC(SB)
RET
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