mirror of
https://github.com/golang/go
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201b12499c
Change-Id: Ia47e1e387acd30f30559d766aa6fca18cbb098f9 Reviewed-on: https://go-review.googlesource.com/5010 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
435 lines
8.9 KiB
ArmAsm
435 lines
8.9 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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// void runtime·asmstdcall(void *c);
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TEXT runtime·asmstdcall(SB),NOSPLIT,$0
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MOVL fn+0(FP), BX
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// SetLastError(0).
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MOVL $0, 0x34(FS)
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// Copy args to the stack.
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MOVL SP, BP
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MOVL libcall_n(BX), CX // words
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MOVL CX, AX
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SALL $2, AX
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SUBL AX, SP // room for args
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MOVL SP, DI
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MOVL libcall_args(BX), SI
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CLD
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REP; MOVSL
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// Call stdcall or cdecl function.
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// DI SI BP BX are preserved, SP is not
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CALL libcall_fn(BX)
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MOVL BP, SP
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// Return result.
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MOVL fn+0(FP), BX
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MOVL AX, libcall_r1(BX)
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MOVL DX, libcall_r2(BX)
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// GetLastError().
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MOVL 0x34(FS), AX
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MOVL AX, libcall_err(BX)
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RET
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TEXT runtime·badsignal2(SB),NOSPLIT,$24
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// stderr
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MOVL $-12, 0(SP)
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MOVL SP, BP
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CALL *runtime·_GetStdHandle(SB)
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MOVL BP, SP
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MOVL AX, 0(SP) // handle
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MOVL $runtime·badsignalmsg(SB), DX // pointer
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MOVL DX, 4(SP)
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MOVL runtime·badsignallen(SB), DX // count
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MOVL DX, 8(SP)
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LEAL 20(SP), DX // written count
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MOVL $0, 0(DX)
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MOVL DX, 12(SP)
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MOVL $0, 16(SP) // overlapped
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CALL *runtime·_WriteFile(SB)
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MOVL BP, SI
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RET
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// faster get/set last error
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TEXT runtime·getlasterror(SB),NOSPLIT,$0
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MOVL 0x34(FS), AX
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MOVL AX, ret+0(FP)
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RET
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TEXT runtime·setlasterror(SB),NOSPLIT,$0
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MOVL err+0(FP), AX
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MOVL AX, 0x34(FS)
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RET
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// Called by Windows as a Vectored Exception Handler (VEH).
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// First argument is pointer to struct containing
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// exception record and context pointers.
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// Handler function is stored in AX.
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// Return 0 for 'not handled', -1 for handled.
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TEXT runtime·sigtramp(SB),NOSPLIT,$0-0
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MOVL ptrs+0(FP), CX
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SUBL $40, SP
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// save callee-saved registers
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MOVL BX, 28(SP)
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MOVL BP, 16(SP)
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MOVL SI, 20(SP)
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MOVL DI, 24(SP)
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MOVL AX, SI // save handler address
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// find g
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get_tls(DX)
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CMPL DX, $0
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JNE 3(PC)
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MOVL $0, AX // continue
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JMP done
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MOVL g(DX), DX
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CMPL DX, $0
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JNE 2(PC)
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CALL runtime·badsignal2(SB)
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// save g and SP in case of stack switch
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MOVL DX, 32(SP) // g
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MOVL SP, 36(SP)
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// do we need to switch to the g0 stack?
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MOVL g_m(DX), BX
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MOVL m_g0(BX), BX
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CMPL DX, BX
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JEQ g0
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// switch to the g0 stack
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get_tls(BP)
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MOVL BX, g(BP)
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MOVL (g_sched+gobuf_sp)(BX), DI
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// make it look like mstart called us on g0, to stop traceback
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SUBL $4, DI
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MOVL $runtime·mstart(SB), 0(DI)
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// traceback will think that we've done SUBL
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// on this stack, so subtract them here to match.
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// (we need room for sighandler arguments anyway).
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// and re-save old SP for restoring later.
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SUBL $40, DI
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MOVL SP, 36(DI)
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MOVL DI, SP
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g0:
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MOVL 0(CX), BX // ExceptionRecord*
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MOVL 4(CX), CX // Context*
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MOVL BX, 0(SP)
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MOVL CX, 4(SP)
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MOVL DX, 8(SP)
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CALL SI // call handler
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// AX is set to report result back to Windows
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MOVL 12(SP), AX
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// switch back to original stack and g
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// no-op if we never left.
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MOVL 36(SP), SP
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MOVL 32(SP), DX
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get_tls(BP)
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MOVL DX, g(BP)
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done:
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// restore callee-saved registers
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MOVL 24(SP), DI
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MOVL 20(SP), SI
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MOVL 16(SP), BP
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MOVL 28(SP), BX
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ADDL $40, SP
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// RET 4 (return and pop 4 bytes parameters)
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BYTE $0xC2; WORD $4
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RET // unreached; make assembler happy
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TEXT runtime·exceptiontramp(SB),NOSPLIT,$0
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MOVL $runtime·exceptionhandler(SB), AX
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JMP runtime·sigtramp(SB)
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TEXT runtime·firstcontinuetramp(SB),NOSPLIT,$0-0
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// is never called
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INT $3
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TEXT runtime·lastcontinuetramp(SB),NOSPLIT,$0-0
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MOVL $runtime·lastcontinuehandler(SB), AX
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JMP runtime·sigtramp(SB)
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TEXT runtime·ctrlhandler(SB),NOSPLIT,$0
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PUSHL $runtime·ctrlhandler1(SB)
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CALL runtime·externalthreadhandler(SB)
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MOVL 4(SP), CX
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ADDL $12, SP
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JMP CX
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TEXT runtime·profileloop(SB),NOSPLIT,$0
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PUSHL $runtime·profileloop1(SB)
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CALL runtime·externalthreadhandler(SB)
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MOVL 4(SP), CX
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ADDL $12, SP
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JMP CX
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TEXT runtime·externalthreadhandler(SB),NOSPLIT,$0
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PUSHL BP
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MOVL SP, BP
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PUSHL BX
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PUSHL SI
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PUSHL DI
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PUSHL 0x14(FS)
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MOVL SP, DX
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// setup dummy m, g
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SUBL $m__size, SP // space for M
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MOVL SP, 0(SP)
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MOVL $m__size, 4(SP)
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CALL runtime·memclr(SB) // smashes AX,BX,CX
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LEAL m_tls(SP), CX
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MOVL CX, 0x14(FS)
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MOVL SP, BX
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SUBL $g__size, SP // space for G
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MOVL SP, g(CX)
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MOVL SP, m_g0(BX)
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MOVL SP, 0(SP)
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MOVL $g__size, 4(SP)
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CALL runtime·memclr(SB) // smashes AX,BX,CX
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LEAL g__size(SP), BX
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MOVL BX, g_m(SP)
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LEAL -8192(SP), CX
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MOVL CX, (g_stack+stack_lo)(SP)
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ADDL $const__StackGuard, CX
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MOVL CX, g_stackguard0(SP)
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MOVL CX, g_stackguard1(SP)
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MOVL DX, (g_stack+stack_hi)(SP)
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PUSHL 16(BP) // arg for handler
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CALL 8(BP)
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POPL CX
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get_tls(CX)
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MOVL g(CX), CX
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MOVL (g_stack+stack_hi)(CX), SP
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POPL 0x14(FS)
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POPL DI
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POPL SI
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POPL BX
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POPL BP
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RET
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GLOBL runtime·cbctxts(SB), NOPTR, $4
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TEXT runtime·callbackasm1+0(SB),NOSPLIT,$0
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MOVL 0(SP), AX // will use to find our callback context
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// remove return address from stack, we are not returning there
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ADDL $4, SP
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// address to callback parameters into CX
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LEAL 4(SP), CX
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// save registers as required for windows callback
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PUSHL DI
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PUSHL SI
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PUSHL BP
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PUSHL BX
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// determine index into runtime·cbctxts table
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SUBL $runtime·callbackasm(SB), AX
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MOVL $0, DX
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MOVL $5, BX // divide by 5 because each call instruction in runtime·callbacks is 5 bytes long
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DIVL BX
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// find correspondent runtime·cbctxts table entry
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MOVL runtime·cbctxts(SB), BX
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MOVL -4(BX)(AX*4), BX
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// extract callback context
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MOVL wincallbackcontext_gobody(BX), AX
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MOVL wincallbackcontext_argsize(BX), DX
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// preserve whatever's at the memory location that
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// the callback will use to store the return value
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PUSHL 0(CX)(DX*1)
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// extend argsize by size of return value
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ADDL $4, DX
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// remember how to restore stack on return
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MOVL wincallbackcontext_restorestack(BX), BX
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PUSHL BX
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// call target Go function
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PUSHL DX // argsize (including return value)
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PUSHL CX // callback parameters
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PUSHL AX // address of target Go function
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CLD
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CALL runtime·cgocallback_gofunc(SB)
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POPL AX
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POPL CX
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POPL DX
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// how to restore stack on return
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POPL BX
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// return value into AX (as per Windows spec)
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// and restore previously preserved value
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MOVL -4(CX)(DX*1), AX
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POPL -4(CX)(DX*1)
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MOVL BX, CX // cannot use BX anymore
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// restore registers as required for windows callback
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POPL BX
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POPL BP
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POPL SI
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POPL DI
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// remove callback parameters before return (as per Windows spec)
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POPL DX
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ADDL CX, SP
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PUSHL DX
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CLD
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RET
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// void tstart(M *newm);
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TEXT runtime·tstart(SB),NOSPLIT,$0
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MOVL newm+4(SP), CX // m
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MOVL m_g0(CX), DX // g
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// Layout new m scheduler stack on os stack.
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MOVL SP, AX
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MOVL AX, (g_stack+stack_hi)(DX)
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SUBL $(64*1024), AX // stack size
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MOVL AX, (g_stack+stack_lo)(DX)
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ADDL $const__StackGuard, AX
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MOVL AX, g_stackguard0(DX)
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MOVL AX, g_stackguard1(DX)
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// Set up tls.
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LEAL m_tls(CX), SI
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MOVL SI, 0x14(FS)
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MOVL CX, g_m(DX)
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MOVL DX, g(SI)
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// Someday the convention will be D is always cleared.
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CLD
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CALL runtime·stackcheck(SB) // clobbers AX,CX
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CALL runtime·mstart(SB)
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RET
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// uint32 tstart_stdcall(M *newm);
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TEXT runtime·tstart_stdcall(SB),NOSPLIT,$0
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MOVL newm+4(SP), BX
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PUSHL BX
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CALL runtime·tstart(SB)
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POPL BX
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// Adjust stack for stdcall to return properly.
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MOVL (SP), AX // save return address
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ADDL $4, SP // remove single parameter
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MOVL AX, (SP) // restore return address
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XORL AX, AX // return 0 == success
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RET
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// setldt(int entry, int address, int limit)
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TEXT runtime·setldt(SB),NOSPLIT,$0
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MOVL address+4(FP), CX
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MOVL CX, 0x14(FS)
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RET
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// Sleep duration is in 100ns units.
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TEXT runtime·usleep1(SB),NOSPLIT,$0
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MOVL usec+0(FP), BX
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MOVL $runtime·usleep2(SB), AX // to hide from 8l
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// Execute call on m->g0 stack, in case we are not actually
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// calling a system call wrapper, like when running under WINE.
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get_tls(CX)
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CMPL CX, $0
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JNE 3(PC)
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// Not a Go-managed thread. Do not switch stack.
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CALL AX
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RET
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MOVL g(CX), BP
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MOVL g_m(BP), BP
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// leave pc/sp for cpu profiler
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MOVL (SP), SI
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MOVL SI, m_libcallpc(BP)
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MOVL g(CX), SI
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MOVL SI, m_libcallg(BP)
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// sp must be the last, because once async cpu profiler finds
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// all three values to be non-zero, it will use them
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LEAL usec+0(FP), SI
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MOVL SI, m_libcallsp(BP)
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MOVL m_g0(BP), SI
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CMPL g(CX), SI
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JNE switch
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// executing on m->g0 already
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CALL AX
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JMP ret
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switch:
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// Switch to m->g0 stack and back.
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MOVL (g_sched+gobuf_sp)(SI), SI
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MOVL SP, -4(SI)
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LEAL -4(SI), SP
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CALL AX
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MOVL 0(SP), SP
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ret:
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get_tls(CX)
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MOVL g(CX), BP
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MOVL g_m(BP), BP
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MOVL $0, m_libcallsp(BP)
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RET
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// Runs on OS stack. duration (in 100ns units) is in BX.
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TEXT runtime·usleep2(SB),NOSPLIT,$20
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// Want negative 100ns units.
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NEGL BX
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MOVL $-1, hi-4(SP)
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MOVL BX, lo-8(SP)
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LEAL lo-8(SP), BX
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MOVL BX, ptime-12(SP)
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MOVL $0, alertable-16(SP)
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MOVL $-1, handle-20(SP)
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MOVL SP, BP
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MOVL runtime·_NtWaitForSingleObject(SB), AX
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CALL AX
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MOVL BP, SP
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RET
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// func now() (sec int64, nsec int32)
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TEXT time·now(SB),NOSPLIT,$8-12
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CALL runtime·unixnano(SB)
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MOVL 0(SP), AX
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MOVL 4(SP), DX
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MOVL $1000000000, CX
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DIVL CX
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MOVL AX, sec+0(FP)
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MOVL $0, sec+4(FP)
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MOVL DX, nsec+8(FP)
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RET
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