| // 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" |
| |
| // maxargs should be divisible by 2, as Windows stack |
| // must be kept 16-byte aligned on syscall entry. |
| #define maxargs 16 |
| |
| // void runtime·asmstdcall(void *c); |
| TEXT runtime·asmstdcall(SB),NOSPLIT|NOFRAME,$0 |
| // asmcgocall will put first argument into CX. |
| PUSHQ CX // save for later |
| 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 $(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, $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 |
| |
| // Call stdcall function. |
| CALL AX |
| |
| ADDQ $(maxargs*8), SP |
| |
| // Return result. |
| POPQ CX |
| MOVQ AX, libcall_r1(CX) |
| |
| // GetLastError(). |
| MOVQ 0x30(GS), DI |
| MOVL 0x68(DI), AX |
| MOVQ AX, libcall_err(CX) |
| |
| RET |
| |
| TEXT runtime·badsignal2(SB),NOSPLIT|NOFRAME,$48 |
| // stderr |
| MOVQ $-12, CX // stderr |
| MOVQ CX, 0(SP) |
| MOVQ runtime·_GetStdHandle(SB), AX |
| CALL AX |
| |
| MOVQ AX, CX // handle |
| MOVQ CX, 0(SP) |
| MOVQ $runtime·badsignalmsg(SB), DX // pointer |
| MOVQ DX, 8(SP) |
| MOVL $runtime·badsignallen(SB), R8 // count |
| MOVQ R8, 16(SP) |
| LEAQ 40(SP), R9 // written count |
| MOVQ $0, 0(R9) |
| MOVQ R9, 24(SP) |
| MOVQ $0, 32(SP) // overlapped |
| MOVQ runtime·_WriteFile(SB), AX |
| CALL AX |
| |
| 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 |
| |
| TEXT runtime·setlasterror(SB),NOSPLIT,$0 |
| MOVL err+0(FP), AX |
| MOVQ 0x30(GS), CX |
| MOVL AX, 0x68(CX) |
| 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 runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0-0 |
| // CX: PEXCEPTION_POINTERS ExceptionInfo |
| |
| // DI SI BP BX R12 R13 R14 R15 registers and DF flag are preserved |
| // as required by windows callback convention. |
| PUSHFQ |
| SUBQ $112, SP |
| MOVQ DI, 80(SP) |
| MOVQ SI, 72(SP) |
| MOVQ BP, 64(SP) |
| MOVQ BX, 56(SP) |
| MOVQ R12, 48(SP) |
| MOVQ R13, 40(SP) |
| MOVQ R14, 32(SP) |
| MOVQ R15, 88(SP) |
| |
| MOVQ AX, R15 // save handler address |
| |
| // find g |
| get_tls(DX) |
| CMPQ DX, $0 |
| JNE 3(PC) |
| MOVQ $0, AX // continue |
| JMP done |
| MOVQ g(DX), DX |
| CMPQ DX, $0 |
| JNE 2(PC) |
| CALL runtime·badsignal2(SB) |
| |
| // save g and SP in case of stack switch |
| MOVQ DX, 96(SP) // g |
| MOVQ SP, 104(SP) |
| |
| // do we need to switch to the g0 stack? |
| MOVQ g_m(DX), BX |
| MOVQ m_g0(BX), BX |
| CMPQ DX, BX |
| JEQ g0 |
| |
| // switch to g0 stack |
| get_tls(BP) |
| MOVQ BX, g(BP) |
| MOVQ (g_sched+gobuf_sp)(BX), DI |
| // make it look like mstart called us on g0, to stop traceback |
| SUBQ $8, DI |
| MOVQ $runtime·mstart(SB), SI |
| MOVQ SI, 0(DI) |
| // traceback will think that we've done PUSHFQ and SUBQ |
| // on this stack, so subtract them here to match. |
| // (we need room for sighandler arguments anyway). |
| // and re-save old SP for restoring later. |
| SUBQ $(112+8), DI |
| // save g, save old stack pointer. |
| MOVQ SP, 104(DI) |
| MOVQ DI, SP |
| |
| g0: |
| MOVQ 0(CX), BX // ExceptionRecord* |
| MOVQ 8(CX), CX // Context* |
| MOVQ BX, 0(SP) |
| MOVQ CX, 8(SP) |
| MOVQ DX, 16(SP) |
| CALL R15 // call handler |
| // AX is set to report result back to Windows |
| MOVL 24(SP), AX |
| |
| // switch back to original stack and g |
| // no-op if we never left. |
| MOVQ 104(SP), SP |
| MOVQ 96(SP), DX |
| get_tls(BP) |
| MOVQ DX, g(BP) |
| |
| done: |
| // restore registers as required for windows callback |
| MOVQ 88(SP), R15 |
| MOVQ 32(SP), R14 |
| MOVQ 40(SP), R13 |
| MOVQ 48(SP), R12 |
| MOVQ 56(SP), BX |
| MOVQ 64(SP), BP |
| MOVQ 72(SP), SI |
| MOVQ 80(SP), DI |
| ADDQ $112, SP |
| POPFQ |
| |
| RET |
| |
| TEXT runtime·exceptiontramp(SB),NOSPLIT|NOFRAME,$0 |
| MOVQ $runtime·exceptionhandler(SB), AX |
| JMP runtime·sigtramp(SB) |
| |
| TEXT runtime·firstcontinuetramp(SB),NOSPLIT|NOFRAME,$0-0 |
| MOVQ $runtime·firstcontinuehandler(SB), AX |
| JMP runtime·sigtramp(SB) |
| |
| TEXT runtime·lastcontinuetramp(SB),NOSPLIT|NOFRAME,$0-0 |
| MOVQ $runtime·lastcontinuehandler(SB), AX |
| JMP runtime·sigtramp(SB) |
| |
| TEXT runtime·ctrlhandler(SB),NOSPLIT|NOFRAME,$8 |
| MOVQ CX, 16(SP) // spill |
| MOVQ $runtime·ctrlhandler1(SB), CX |
| MOVQ CX, 0(SP) |
| CALL runtime·externalthreadhandler(SB) |
| RET |
| |
| TEXT runtime·profileloop(SB),NOSPLIT|NOFRAME,$8 |
| MOVQ $runtime·profileloop1(SB), CX |
| MOVQ CX, 0(SP) |
| CALL runtime·externalthreadhandler(SB) |
| RET |
| |
| TEXT runtime·externalthreadhandler(SB),NOSPLIT|NOFRAME,$0 |
| PUSHQ BP |
| MOVQ SP, BP |
| PUSHQ BX |
| PUSHQ SI |
| PUSHQ DI |
| PUSHQ 0x28(GS) |
| MOVQ SP, DX |
| |
| // setup dummy m, g |
| SUBQ $m__size, SP // space for M |
| MOVQ SP, 0(SP) |
| MOVQ $m__size, 8(SP) |
| CALL runtime·memclr(SB) // smashes AX,BX,CX, maybe BP |
| |
| LEAQ m_tls(SP), CX |
| MOVQ CX, 0x28(GS) |
| MOVQ SP, BX |
| SUBQ $g__size, SP // space for G |
| MOVQ SP, g(CX) |
| MOVQ SP, m_g0(BX) |
| |
| MOVQ SP, 0(SP) |
| MOVQ $g__size, 8(SP) |
| CALL runtime·memclr(SB) // smashes AX,BX,CX, maybe BP |
| LEAQ g__size(SP), BX |
| MOVQ BX, g_m(SP) |
| |
| LEAQ -32768(SP), CX // must be less than SizeOfStackReserve set by linker |
| MOVQ CX, (g_stack+stack_lo)(SP) |
| ADDQ $const__StackGuard, CX |
| MOVQ CX, g_stackguard0(SP) |
| MOVQ CX, g_stackguard1(SP) |
| MOVQ DX, (g_stack+stack_hi)(SP) |
| |
| PUSHQ AX // room for return value |
| PUSHQ 32(BP) // arg for handler |
| CALL 16(BP) |
| POPQ CX |
| POPQ AX // pass return value to Windows in AX |
| |
| get_tls(CX) |
| MOVQ g(CX), CX |
| MOVQ (g_stack+stack_hi)(CX), SP |
| POPQ 0x28(GS) |
| POPQ DI |
| POPQ SI |
| POPQ BX |
| POPQ BP |
| RET |
| |
| GLOBL runtime·cbctxts(SB), NOPTR, $8 |
| |
| TEXT runtime·callbackasm1(SB),NOSPLIT,$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) |
| |
| // remove return address from stack, we are not returning there |
| MOVQ 0(SP), AX |
| ADDQ $8, SP |
| |
| // determine index into runtime·cbctxts 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 |
| |
| // find correspondent runtime·cbctxts table entry |
| MOVQ runtime·cbctxts(SB), CX |
| MOVQ -8(CX)(AX*8), AX |
| |
| // extract callback context |
| MOVQ wincallbackcontext_argsize(AX), DX |
| MOVQ wincallbackcontext_gobody(AX), AX |
| |
| // preserve whatever's at the memory location that |
| // the callback will use to store the return value |
| LEAQ 8(SP), CX // args vector, skip return address |
| PUSHQ 0(CX)(DX*1) // store 8 bytes from just after the args array |
| ADDQ $8, DX // extend argsize by size of return value |
| |
| // DI SI BP BX R12 R13 R14 R15 registers and DF flag are preserved |
| // as required by windows callback convention. |
| PUSHFQ |
| SUBQ $64, SP |
| MOVQ DI, 56(SP) |
| MOVQ SI, 48(SP) |
| MOVQ BP, 40(SP) |
| MOVQ BX, 32(SP) |
| MOVQ R12, 24(SP) |
| MOVQ R13, 16(SP) |
| MOVQ R14, 8(SP) |
| MOVQ R15, 0(SP) |
| |
| // prepare call stack. use SUBQ to hide from stack frame checks |
| // cgocallback(Go func, void *frame, uintptr framesize) |
| SUBQ $24, SP |
| MOVQ DX, 16(SP) // argsize (including return value) |
| MOVQ CX, 8(SP) // callback parameters |
| MOVQ AX, 0(SP) // address of target Go function |
| CLD |
| CALL runtime·cgocallback_gofunc(SB) |
| MOVQ 0(SP), AX |
| MOVQ 8(SP), CX |
| MOVQ 16(SP), DX |
| ADDQ $24, SP |
| |
| // restore registers as required for windows callback |
| MOVQ 0(SP), R15 |
| MOVQ 8(SP), R14 |
| MOVQ 16(SP), R13 |
| MOVQ 24(SP), R12 |
| MOVQ 32(SP), BX |
| MOVQ 40(SP), BP |
| MOVQ 48(SP), SI |
| MOVQ 56(SP), DI |
| ADDQ $64, SP |
| POPFQ |
| |
| MOVL -8(CX)(DX*1), AX // return value |
| POPQ -8(CX)(DX*1) // restore bytes just after the args |
| RET |
| |
| // uint32 tstart_stdcall(M *newm); |
| TEXT runtime·tstart_stdcall(SB),NOSPLIT,$0 |
| // 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 // stack size |
| 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), SI |
| MOVQ SI, 0x28(GS) |
| MOVQ CX, g_m(DX) |
| MOVQ DX, g(SI) |
| |
| // Someday the convention will be D is always cleared. |
| CLD |
| |
| CALL runtime·stackcheck(SB) // clobbers AX,CX |
| CALL runtime·mstart(SB) |
| |
| XORL AX, AX // return 0 == success |
| RET |
| |
| // set tls base to DI |
| TEXT runtime·settls(SB),NOSPLIT,$0 |
| MOVQ DI, 0x28(GS) |
| RET |
| |
| // func onosstack(fn unsafe.Pointer, arg uint32) |
| TEXT runtime·onosstack(SB),NOSPLIT,$0 |
| MOVQ fn+0(FP), AX // to hide from 6l |
| MOVL arg+8(FP), BX |
| |
| // Execute call on m->g0 stack, in case we are not actually |
| // calling a system call wrapper, like when running under WINE. |
| get_tls(R15) |
| CMPQ R15, $0 |
| JNE 3(PC) |
| // Not a Go-managed thread. Do not switch stack. |
| CALL AX |
| RET |
| |
| MOVQ g(R15), R13 |
| MOVQ g_m(R13), R13 |
| |
| // leave pc/sp for cpu profiler |
| MOVQ (SP), R12 |
| MOVQ R12, m_libcallpc(R13) |
| MOVQ g(R15), R12 |
| MOVQ R12, m_libcallg(R13) |
| // sp must be the last, because once async cpu profiler finds |
| // all three values to be non-zero, it will use them |
| LEAQ usec+0(FP), R12 |
| MOVQ R12, m_libcallsp(R13) |
| |
| MOVQ m_g0(R13), R14 |
| CMPQ g(R15), R14 |
| JNE switch |
| // executing on m->g0 already |
| CALL AX |
| JMP ret |
| |
| switch: |
| // Switch to m->g0 stack and back. |
| MOVQ (g_sched+gobuf_sp)(R14), R14 |
| MOVQ SP, -8(R14) |
| LEAQ -8(R14), SP |
| CALL AX |
| MOVQ 0(SP), SP |
| |
| ret: |
| MOVQ $0, m_libcallsp(R13) |
| RET |
| |
| // Runs on OS stack. duration (in 100ns units) is in BX. |
| // The function leaves room for 4 syscall parameters |
| // (as per windows amd64 calling convention). |
| TEXT runtime·usleep2(SB),NOSPLIT|NOFRAME,$48 |
| MOVQ SP, AX |
| ANDQ $~15, SP // alignment as per Windows requirement |
| MOVQ AX, 40(SP) |
| // Want negative 100ns units. |
| NEGQ BX |
| 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|NOFRAME,$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 |
| |
| // func now() (sec int64, nsec int32) |
| TEXT time·now(SB),NOSPLIT,$8-12 |
| CALL runtime·unixnano(SB) |
| MOVQ 0(SP), AX |
| |
| // generated code for |
| // func f(x uint64) (uint64, uint64) { return x/1000000000, x%100000000 } |
| // adapted to reduce duplication |
| MOVQ AX, CX |
| MOVQ $1360296554856532783, AX |
| MULQ CX |
| ADDQ CX, DX |
| RCRQ $1, DX |
| SHRQ $29, DX |
| MOVQ DX, sec+0(FP) |
| IMULQ $1000000000, DX |
| SUBQ DX, CX |
| MOVL CX, nsec+8(FP) |
| RET |
| |
