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Diffstat (limited to 'src/runtime/sys_windows_amd64.s')
| -rw-r--r-- | src/runtime/sys_windows_amd64.s | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/src/runtime/sys_windows_amd64.s b/src/runtime/sys_windows_amd64.s new file mode 100644 index 0000000..e66f444 --- /dev/null +++ b/src/runtime/sys_windows_amd64.s @@ -0,0 +1,319 @@ +// Copyright 2011 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" +#include "cgo/abi_amd64.h" + +// Offsets into Thread Environment Block (pointer in GS) +#define TEB_TlsSlots 0x1480 +#define TEB_ArbitraryPtr 0x28 + +// void runtime·asmstdcall(void *c); +TEXT runtime·asmstdcall(SB),NOSPLIT,$16 + MOVQ SP, AX + ANDQ $~15, SP // alignment as per Windows requirement + MOVQ AX, 8(SP) + MOVQ CX, 0(SP) // asmcgocall will put first argument into CX. + + MOVQ libcall_fn(CX), AX + MOVQ libcall_args(CX), SI + MOVQ libcall_n(CX), CX + + // SetLastError(0). + MOVQ 0x30(GS), DI + MOVL $0, 0x68(DI) + + SUBQ $(const_maxArgs*8), SP // room for args + + // Fast version, do not store args on the stack. + CMPL CX, $4 + JLE loadregs + + // Check we have enough room for args. + CMPL CX, $const_maxArgs + JLE 2(PC) + INT $3 // not enough room -> crash + + // Copy args to the stack. + MOVQ SP, DI + CLD + REP; MOVSQ + MOVQ SP, SI + +loadregs: + // Load first 4 args into correspondent registers. + MOVQ 0(SI), CX + MOVQ 8(SI), DX + MOVQ 16(SI), R8 + MOVQ 24(SI), R9 + // Floating point arguments are passed in the XMM + // registers. Set them here in case any of the arguments + // are floating point values. For details see + // https://msdn.microsoft.com/en-us/library/zthk2dkh.aspx + MOVQ CX, X0 + MOVQ DX, X1 + MOVQ R8, X2 + MOVQ R9, X3 + + // Call stdcall function. + CALL AX + + ADDQ $(const_maxArgs*8), SP + + // Return result. + MOVQ 0(SP), CX + MOVQ 8(SP), SP + MOVQ AX, libcall_r1(CX) + // Floating point return values are returned in XMM0. Setting r2 to this + // value in case this call returned a floating point value. For details, + // see https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention + MOVQ X0, libcall_r2(CX) + + // GetLastError(). + MOVQ 0x30(GS), DI + MOVL 0x68(DI), AX + MOVQ AX, libcall_err(CX) + + RET + +// faster get/set last error +TEXT runtime·getlasterror(SB),NOSPLIT,$0 + MOVQ 0x30(GS), AX + MOVL 0x68(AX), AX + MOVL AX, ret+0(FP) + RET + +// Called by Windows as a Vectored Exception Handler (VEH). +// CX is pointer to struct containing +// exception record and context pointers. +// DX is the kind of sigtramp function. +// Return value of sigtrampgo is stored in AX. +TEXT sigtramp<>(SB),NOSPLIT|NOFRAME,$0-0 + // Switch from the host ABI to the Go ABI. + PUSH_REGS_HOST_TO_ABI0() + + // Set up ABIInternal environment: cleared X15 and R14. + // R14 is cleared in case there's a non-zero value in there + // if called from a non-go thread. + XORPS X15, X15 + XORQ R14, R14 + + get_tls(AX) + CMPQ AX, $0 + JE 2(PC) + // Exception from Go thread, set R14. + MOVQ g(AX), R14 + + // Reserve space for spill slots. + ADJSP $16 + MOVQ CX, AX + MOVQ DX, BX + // Calling ABIInternal because TLS might be nil. + CALL runtime·sigtrampgo<ABIInternal>(SB) + // Return value is already stored in AX. + + ADJSP $-16 + + POP_REGS_HOST_TO_ABI0() + RET + +// 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. +// R8 and R9 are set above at the end of sigtrampgo +// in the context that starts executing at sigresume. +TEXT runtime·sigresume(SB),NOSPLIT|NOFRAME,$0 + MOVQ R8, SP + JMP R9 + +TEXT runtime·exceptiontramp(SB),NOSPLIT|NOFRAME,$0 + // PExceptionPointers already on CX + MOVQ $const_callbackVEH, DX + JMP sigtramp<>(SB) + +TEXT runtime·firstcontinuetramp(SB),NOSPLIT|NOFRAME,$0-0 + // PExceptionPointers already on CX + MOVQ $const_callbackFirstVCH, DX + JMP sigtramp<>(SB) + +TEXT runtime·lastcontinuetramp(SB),NOSPLIT|NOFRAME,$0-0 + // PExceptionPointers already on CX + MOVQ $const_callbackLastVCH, DX + JMP sigtramp<>(SB) + +TEXT runtime·callbackasm1(SB),NOSPLIT|NOFRAME,$0 + // Construct args vector for cgocallback(). + // By windows/amd64 calling convention first 4 args are in CX, DX, R8, R9 + // args from the 5th on are on the stack. + // In any case, even if function has 0,1,2,3,4 args, there is reserved + // but uninitialized "shadow space" for the first 4 args. + // The values are in registers. + MOVQ CX, (16+0)(SP) + MOVQ DX, (16+8)(SP) + MOVQ R8, (16+16)(SP) + MOVQ R9, (16+24)(SP) + // R8 = address of args vector + LEAQ (16+0)(SP), R8 + + // remove return address from stack, we are not returning to callbackasm, but to its caller. + MOVQ 0(SP), AX + ADDQ $8, SP + + // determine index into runtime·cbs table + MOVQ $runtime·callbackasm(SB), DX + SUBQ DX, AX + MOVQ $0, DX + MOVQ $5, CX // divide by 5 because each call instruction in runtime·callbacks is 5 bytes long + DIVL CX + SUBQ $1, AX // subtract 1 because return PC is to the next slot + + // Switch from the host ABI to the Go ABI. + PUSH_REGS_HOST_TO_ABI0() + + // Create a struct callbackArgs on our stack to be passed as + // the "frame" to cgocallback and on to callbackWrap. + SUBQ $(24+callbackArgs__size), SP + MOVQ AX, (24+callbackArgs_index)(SP) // callback index + MOVQ R8, (24+callbackArgs_args)(SP) // address of args vector + MOVQ $0, (24+callbackArgs_result)(SP) // result + LEAQ 24(SP), AX + // Call cgocallback, which will call callbackWrap(frame). + MOVQ $0, 16(SP) // context + MOVQ AX, 8(SP) // frame (address of callbackArgs) + LEAQ ·callbackWrap<ABIInternal>(SB), BX // cgocallback takes an ABIInternal entry-point + MOVQ BX, 0(SP) // PC of function value to call (callbackWrap) + CALL ·cgocallback(SB) + // Get callback result. + MOVQ (24+callbackArgs_result)(SP), AX + ADDQ $(24+callbackArgs__size), SP + + POP_REGS_HOST_TO_ABI0() + + // The return value was placed in AX above. + RET + +// uint32 tstart_stdcall(M *newm); +TEXT runtime·tstart_stdcall(SB),NOSPLIT|NOFRAME,$0 + // Switch from the host ABI to the Go ABI. + PUSH_REGS_HOST_TO_ABI0() + + // CX contains first arg newm + MOVQ m_g0(CX), DX // g + + // Layout new m scheduler stack on os stack. + MOVQ SP, AX + MOVQ AX, (g_stack+stack_hi)(DX) + SUBQ $(64*1024), AX // initial stack size (adjusted later) + MOVQ AX, (g_stack+stack_lo)(DX) + ADDQ $const_stackGuard, AX + MOVQ AX, g_stackguard0(DX) + MOVQ AX, g_stackguard1(DX) + + // Set up tls. + LEAQ m_tls(CX), DI + MOVQ CX, g_m(DX) + MOVQ DX, g(DI) + CALL runtime·settls(SB) // clobbers CX + + CALL runtime·stackcheck(SB) // clobbers AX,CX + CALL runtime·mstart(SB) + + POP_REGS_HOST_TO_ABI0() + + XORL AX, AX // return 0 == success + RET + +// set tls base to DI +TEXT runtime·settls(SB),NOSPLIT,$0 + MOVQ runtime·tls_g(SB), CX + MOVQ DI, 0(CX)(GS) + RET + +// Runs on OS stack. +// duration (in -100ns units) is in dt+0(FP). +// g may be nil. +// The function leaves room for 4 syscall parameters +// (as per windows amd64 calling convention). +TEXT runtime·usleep2(SB),NOSPLIT,$48-4 + MOVLQSX dt+0(FP), BX + MOVQ SP, AX + ANDQ $~15, SP // alignment as per Windows requirement + MOVQ AX, 40(SP) + LEAQ 32(SP), R8 // ptime + MOVQ BX, (R8) + MOVQ $-1, CX // handle + MOVQ $0, DX // alertable + MOVQ runtime·_NtWaitForSingleObject(SB), AX + CALL AX + MOVQ 40(SP), SP + RET + +// Runs on OS stack. +TEXT runtime·switchtothread(SB),NOSPLIT,$0 + MOVQ SP, AX + ANDQ $~15, SP // alignment as per Windows requirement + SUBQ $(48), SP // room for SP and 4 args as per Windows requirement + // plus one extra word to keep stack 16 bytes aligned + MOVQ AX, 32(SP) + MOVQ runtime·_SwitchToThread(SB), AX + CALL AX + MOVQ 32(SP), SP + RET + +TEXT runtime·nanotime1(SB),NOSPLIT,$0-8 + CMPB runtime·useQPCTime(SB), $0 + JNE useQPC + MOVQ $_INTERRUPT_TIME, DI + MOVQ time_lo(DI), AX + IMULQ $100, AX + MOVQ AX, ret+0(FP) + RET +useQPC: + JMP runtime·nanotimeQPC(SB) + RET + +// func osSetupTLS(mp *m) +// Setup TLS. for use by needm on Windows. +TEXT runtime·osSetupTLS(SB),NOSPLIT,$0-8 + MOVQ mp+0(FP), AX + LEAQ m_tls(AX), DI + CALL runtime·settls(SB) + 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 + MOVQ SP, AX + ANDQ $~15, SP // alignment as per Windows requirement + SUBQ $48, SP // room for SP and 4 args as per Windows requirement + // plus one extra word to keep stack 16 bytes aligned + MOVQ AX, 32(SP) + MOVQ runtime·_TlsAlloc(SB), AX + CALL AX + MOVQ 32(SP), SP + + MOVQ AX, CX // TLS index + + // Assert that slot is less than 64 so we can use _TEB->TlsSlots + CMPQ CX, $64 + JB ok + + // Fallback to the TEB arbitrary pointer. + // TODO: don't use the arbitrary pointer (see go.dev/issue/59824) + MOVQ $TEB_ArbitraryPtr, CX + JMP settls +ok: + // Convert the TLS index at CX into + // an offset from TEB_TlsSlots. + SHLQ $3, CX + + // Save offset from TLS into tls_g. + ADDQ $TEB_TlsSlots, CX +settls: + MOVQ CX, runtime·tls_g(SB) + RET |