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Viewing File: 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"
// Offsets into Thread Environment Block (pointer in FS)
#define TEB_TlsSlots 0xE10
#define TEB_ArbitraryPtr 0x14
TEXT runtime·asmstdcall_trampoline<ABIInternal>(SB),NOSPLIT,$0
JMP runtime·asmstdcall(SB)
// void runtime·asmstdcall(void *c);
TEXT runtime·asmstdcall(SB),NOSPLIT,$0
MOVL fn+0(FP), BX
MOVL SP, BP // save stack pointer
// SetLastError(0).
MOVL $0, 0x34(FS)
MOVL libcall_n(BX), CX
// Fast version, do not store args on the stack.
CMPL CX, $0
JE docall
// Copy args to the stack.
MOVL CX, AX
SALL $2, AX
SUBL AX, SP // room for args
MOVL SP, DI
MOVL libcall_args(BX), SI
CLD
REP; MOVSL
docall:
// 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
// faster get/set last error
TEXT runtime·getlasterror(SB),NOSPLIT,$0
MOVL 0x34(FS), AX
MOVL AX, ret+0(FP)
RET
TEXT runtime·sigFetchGSafe<ABIInternal>(SB),NOSPLIT,$0
get_tls(AX)
CMPL AX, $0
JE 2(PC)
MOVL g(AX), AX
MOVL AX, ret+0(FP)
RET
// Called by Windows as a Vectored Exception Handler (VEH).
// AX is pointer to struct containing
// exception record and context pointers.
// CX is the kind of sigtramp function.
// Return value of sigtrampgo is stored in AX.
TEXT sigtramp<>(SB),NOSPLIT,$0-0
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, 0(SP)
MOVL CX, 4(SP)
CALL runtime·sigtrampgo(SB)
MOVL 8(SP), AX
// 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
// Trampoline to resume execution from exception handler.
// This is part of the control flow guard workaround.
// It switches stacks and jumps to the continuation address.
// DX and CX are set above at the end of sigtrampgo
// in the context that starts executing at sigresume.
TEXT runtime·sigresume(SB),NOSPLIT,$0
MOVL DX, SP
JMP CX
TEXT runtime·exceptiontramp(SB),NOSPLIT,$0
MOVL argframe+0(FP), AX
MOVL $const_callbackVEH, CX
JMP sigtramp<>(SB)
TEXT runtime·firstcontinuetramp(SB),NOSPLIT,$0-0
// is never called
INT $3
TEXT runtime·lastcontinuetramp(SB),NOSPLIT,$0-0
MOVL argframe+0(FP), AX
MOVL $const_callbackLastVCH, CX
JMP sigtramp<>(SB)
TEXT runtime·callbackasm1(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(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,$8-4
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), DI
MOVL CX, g_m(DX)
MOVL DX, g(DI)
MOVL DI, 4(SP)
CALL runtime·setldt(SB) // clobbers CX and DX
// 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(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 slot, int base, int size)
TEXT runtime·setldt(SB),NOSPLIT,$0-12
MOVL base+4(FP), DX
MOVL runtime·tls_g(SB), CX
MOVL DX, 0(CX)(FS)
RET
TEXT runtime·nanotime1(SB),NOSPLIT,$0-8
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
// This is called from rt0_go, which runs on the system stack
// using the initial stack allocated by the OS.
TEXT runtime·wintls(SB),NOSPLIT,$0
// Allocate a TLS slot to hold g across calls to external code
MOVL SP, BP
MOVL runtime·_TlsAlloc(SB), AX
CALL AX
MOVL BP, SP
MOVL AX, CX // TLS index
// Assert that slot is less than 64 so we can use _TEB->TlsSlots
CMPL CX, $64
JB ok
// Fallback to the TEB arbitrary pointer.
// TODO: don't use the arbitrary pointer (see go.dev/issue/59824)
MOVL $TEB_ArbitraryPtr, CX
JMP settls
ok:
// Convert the TLS index at CX into
// an offset from TEB_TlsSlots.
SHLL $2, CX
// Save offset from TLS into tls_g.
ADDL $TEB_TlsSlots, CX
settls:
MOVL CX, runtime·tls_g(SB)
RET
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