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// 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 "386/asm.h"
// void *stdcall_raw(void *fn, int32 count, uintptr *args)
TEXT runtime·stdcall_raw(SB),7,$0
// Copy arguments from stack.
MOVL fn+0(FP), AX
MOVL count+4(FP), CX // words
MOVL args+8(FP), BP
// Switch to m->g0 if needed.
get_tls(DI)
MOVL m(DI), DX
MOVL 0(FS), SI
MOVL SI, m_sehframe(DX)
MOVL m_g0(DX), SI
CMPL g(DI), SI
MOVL SP, BX
JEQ 2(PC)
MOVL (m_sched+gobuf_sp)(DX), SP
PUSHL BX
PUSHL g(DI)
MOVL SI, g(DI)
// Copy args to new stack.
MOVL CX, BX
SALL $2, BX
SUBL BX, SP // room for args
MOVL SP, DI
MOVL BP, SI
CLD
REP; MOVSL
// Call stdcall function.
CALL AX
// Restore original SP, g.
get_tls(DI)
POPL g(DI)
POPL SP
// Someday the convention will be D is always cleared.
CLD
RET
// faster get/set last error
TEXT runtime·getlasterror(SB),7,$0
MOVL 0x34(FS), AX
RET
TEXT runtime·setlasterror(SB),7,$0
MOVL err+0(FP), AX
MOVL AX, 0x34(FS)
RET
TEXT runtime·sigtramp(SB),7,$0
PUSHL BP // cdecl
PUSHL 0(FS)
CALL runtime·sigtramp1(SB)
POPL 0(FS)
POPL BP
RET
TEXT runtime·sigtramp1(SB),0,$16-28
// unwinding?
MOVL info+12(FP), BX
MOVL 4(BX), CX // exception flags
ANDL $6, CX
MOVL $1, AX
JNZ sigdone
// place ourselves at the top of the SEH chain to
// ensure SEH frames lie within thread stack bounds
MOVL frame+16(FP), CX // our SEH frame
MOVL CX, 0(FS)
// copy arguments for call to sighandler
MOVL BX, 0(SP)
MOVL CX, 4(SP)
MOVL context+20(FP), BX
MOVL BX, 8(SP)
MOVL dispatcher+24(FP), BX
MOVL BX, 12(SP)
CALL runtime·sighandler(SB)
TESTL AX, AX
JZ sigdone
// call windows default handler early
MOVL 4(SP), BX // our SEH frame
MOVL 0(BX), BX // SEH frame of default handler
MOVL BX, 4(SP) // set establisher frame
CALL 4(BX)
sigdone:
RET
// Windows runs the ctrl handler in a new thread.
TEXT runtime·ctrlhandler(SB),7,$0
PUSHL BP
MOVL SP, BP
PUSHL BX
PUSHL SI
PUSHL DI
PUSHL 0x2c(FS)
MOVL SP, BX
// setup dummy m, g
SUBL $(m_sehframe+4), SP // at least space for m_sehframe
LEAL m_tls(SP), CX
MOVL CX, 0x2c(FS)
MOVL SP, m(CX)
MOVL SP, DX
SUBL $8, SP // space for g_stack{guard,base}
MOVL SP, g(CX)
MOVL SP, m_g0(DX)
LEAL -4096(SP), CX
MOVL CX, g_stackguard(SP)
MOVL BX, g_stackbase(SP)
PUSHL 8(BP)
CALL runtime·ctrlhandler1(SB)
POPL CX
get_tls(CX)
MOVL g(CX), CX
MOVL g_stackbase(CX), SP
POPL 0x2c(FS)
POPL DI
POPL SI
POPL BX
POPL BP
MOVL 0(SP), CX
ADDL $8, SP
JMP CX
// Called from dynamic function created by ../thread.c compilecallback,
// running on Windows stack (not Go stack).
// BX, BP, SI, DI registers and DF flag are preserved
// as required by windows callback convention.
// AX = address of go func we need to call
// DX = total size of arguments
//
TEXT runtime·callbackasm+0(SB),7,$0
// preserve whatever's at the memory location that
// the callback will use to store the return value
LEAL 8(SP), CX
PUSHL 0(CX)(DX*1)
ADDL $4, DX // extend argsize by size of return value
// save registers as required for windows callback
PUSHL 0(FS)
PUSHL DI
PUSHL SI
PUSHL BP
PUSHL BX
PUSHL DX
PUSHL CX
PUSHL AX
// reinstall our SEH handler
get_tls(CX)
MOVL m(CX), CX
MOVL m_sehframe(CX), CX
MOVL CX, 0(FS)
CLD
CALL runtime·cgocallback(SB)
// restore registers as required for windows callback
POPL AX
POPL CX
POPL DX
POPL BX
POPL BP
POPL SI
POPL DI
POPL 0(FS)
CLD
MOVL -4(CX)(DX*1), AX
POPL -4(CX)(DX*1)
RET
// void tstart(M *newm);
TEXT runtime·tstart(SB),7,$0
MOVL newm+4(SP), CX // m
MOVL m_g0(CX), DX // g
// Set up SEH frame
PUSHL $runtime·sigtramp(SB)
PUSHL 0(FS)
MOVL SP, 0(FS)
// Layout new m scheduler stack on os stack.
MOVL SP, AX
MOVL AX, g_stackbase(DX)
SUBL $(64*1024), AX // stack size
MOVL AX, g_stackguard(DX)
// Set up tls.
LEAL m_tls(CX), SI
MOVL SI, 0x2c(FS)
MOVL CX, m(SI)
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)
// Pop SEH frame
MOVL 0(FS), SP
POPL 0(FS)
POPL CX
RET
// uint32 tstart_stdcall(M *newm);
TEXT runtime·tstart_stdcall(SB),7,$0
MOVL newm+4(SP), BX
PUSHL BX
CALL runtime·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),7,$0
MOVL address+4(FP), CX
MOVL CX, 0x2c(FS)
RET
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