| // Copyright 2018 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 "funcdata.h" |
| #include "time_windows.h" |
| #include "cgo/abi_arm64.h" |
| |
| // Offsets into Thread Environment Block (pointer in R18) |
| #define TEB_error 0x68 |
| #define TEB_TlsSlots 0x1480 |
| #define TEB_ArbitraryPtr 0x28 |
| |
| // Note: R0-R7 are args, R8 is indirect return value address, |
| // R9-R15 are caller-save, R19-R29 are callee-save. |
| // |
| // load_g and save_g (in tls_arm64.s) clobber R27 (REGTMP) and R0. |
| |
| TEXT runtime·asmstdcall_trampoline<ABIInternal>(SB),NOSPLIT,$0 |
| B runtime·asmstdcall(SB) |
| |
| // void runtime·asmstdcall(void *c); |
| TEXT runtime·asmstdcall(SB),NOSPLIT,$16 |
| STP (R19, R20), 16(RSP) // save old R19, R20 |
| MOVD R0, R19 // save libcall pointer |
| MOVD RSP, R20 // save stack pointer |
| |
| // SetLastError(0) |
| MOVD $0, TEB_error(R18_PLATFORM) |
| MOVD libcall_args(R19), R12 // libcall->args |
| |
| // Do we have more than 8 arguments? |
| MOVD libcall_n(R19), R0 |
| CMP $0, R0; BEQ _0args |
| CMP $1, R0; BEQ _1args |
| CMP $2, R0; BEQ _2args |
| CMP $3, R0; BEQ _3args |
| CMP $4, R0; BEQ _4args |
| CMP $5, R0; BEQ _5args |
| CMP $6, R0; BEQ _6args |
| CMP $7, R0; BEQ _7args |
| CMP $8, R0; BEQ _8args |
| |
| // Reserve stack space for remaining args |
| SUB $8, R0, R2 |
| ADD $1, R2, R3 // make even number of words for stack alignment |
| AND $~1, R3 |
| LSL $3, R3 |
| SUB R3, RSP |
| |
| // R4: size of stack arguments (n-8)*8 |
| // R5: &args[8] |
| // R6: loop counter, from 0 to (n-8)*8 |
| // R7: scratch |
| // R8: copy of RSP - (R2)(RSP) assembles as (R2)(ZR) |
| SUB $8, R0, R4 |
| LSL $3, R4 |
| ADD $(8*8), R12, R5 |
| MOVD $0, R6 |
| MOVD RSP, R8 |
| stackargs: |
| MOVD (R6)(R5), R7 |
| MOVD R7, (R6)(R8) |
| ADD $8, R6 |
| CMP R6, R4 |
| BNE stackargs |
| |
| _8args: |
| MOVD (7*8)(R12), R7 |
| _7args: |
| MOVD (6*8)(R12), R6 |
| _6args: |
| MOVD (5*8)(R12), R5 |
| _5args: |
| MOVD (4*8)(R12), R4 |
| _4args: |
| MOVD (3*8)(R12), R3 |
| _3args: |
| MOVD (2*8)(R12), R2 |
| _2args: |
| MOVD (1*8)(R12), R1 |
| _1args: |
| MOVD (0*8)(R12), R0 |
| _0args: |
| |
| MOVD libcall_fn(R19), R12 // branch to libcall->fn |
| BL (R12) |
| |
| MOVD R20, RSP // free stack space |
| MOVD R0, libcall_r1(R19) // save return value to libcall->r1 |
| // TODO(rsc) floating point like amd64 in libcall->r2? |
| |
| // GetLastError |
| MOVD TEB_error(R18_PLATFORM), R0 |
| MOVD R0, libcall_err(R19) |
| |
| // Restore callee-saved registers. |
| LDP 16(RSP), (R19, R20) |
| RET |
| |
| TEXT runtime·getlasterror(SB),NOSPLIT,$0 |
| MOVD TEB_error(R18_PLATFORM), R0 |
| MOVD R0, ret+0(FP) |
| RET |
| |
| // Called by Windows as a Vectored Exception Handler (VEH). |
| // R0 is pointer to struct containing |
| // exception record and context pointers. |
| // R1 is the kind of sigtramp function. |
| // Return value of sigtrampgo is stored in R0. |
| TEXT sigtramp<>(SB),NOSPLIT,$176 |
| // Switch from the host ABI to the Go ABI, safe args and lr. |
| MOVD R0, R5 |
| MOVD R1, R6 |
| MOVD LR, R7 |
| SAVE_R19_TO_R28(8*4) |
| SAVE_F8_TO_F15(8*14) |
| |
| BL runtime·load_g(SB) // Clobers R0, R27, R28 (g) |
| |
| MOVD R5, R0 |
| MOVD R6, R1 |
| // Calling ABIInternal because TLS might be nil. |
| BL runtime·sigtrampgo<ABIInternal>(SB) |
| // Return value is already stored in R0. |
| |
| // Restore callee-save registers. |
| RESTORE_R19_TO_R28(8*4) |
| RESTORE_F8_TO_F15(8*14) |
| MOVD R7, LR |
| 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. |
| // R0 and R1 are set above at the end of sigtrampgo |
| // in the context that starts executing at sigresume. |
| TEXT runtime·sigresume(SB),NOSPLIT|NOFRAME,$0 |
| // Important: do not smash LR, |
| // which is set to a live value when handling |
| // a signal by pushing a call to sigpanic onto the stack. |
| MOVD R0, RSP |
| B (R1) |
| |
| TEXT runtime·exceptiontramp(SB),NOSPLIT|NOFRAME,$0 |
| MOVD $const_callbackVEH, R1 |
| B sigtramp<>(SB) |
| |
| TEXT runtime·firstcontinuetramp(SB),NOSPLIT|NOFRAME,$0 |
| MOVD $const_callbackFirstVCH, R1 |
| B sigtramp<>(SB) |
| |
| TEXT runtime·lastcontinuetramp(SB),NOSPLIT|NOFRAME,$0 |
| MOVD $const_callbackLastVCH, R1 |
| B sigtramp<>(SB) |
| |
| TEXT runtime·callbackasm1(SB),NOSPLIT,$208-0 |
| NO_LOCAL_POINTERS |
| |
| // On entry, the trampoline in zcallback_windows_arm64.s left |
| // the callback index in R12 (which is volatile in the C ABI). |
| |
| // Save callback register arguments R0-R7. |
| // We do this at the top of the frame so they're contiguous with stack arguments. |
| // The 7*8 setting up R14 looks like a bug but is not: the eighth word |
| // is the space the assembler reserved for our caller's frame pointer, |
| // but we are not called from Go so that space is ours to use, |
| // and we must to be contiguous with the stack arguments. |
| MOVD $arg0-(7*8)(SP), R14 |
| STP (R0, R1), (0*8)(R14) |
| STP (R2, R3), (2*8)(R14) |
| STP (R4, R5), (4*8)(R14) |
| STP (R6, R7), (6*8)(R14) |
| |
| // Push C callee-save registers R19-R28. |
| // LR, FP already saved. |
| SAVE_R19_TO_R28(8*9) |
| |
| // Create a struct callbackArgs on our stack. |
| MOVD $cbargs-(18*8+callbackArgs__size)(SP), R13 |
| MOVD R12, callbackArgs_index(R13) // callback index |
| MOVD R14, R0 |
| MOVD R0, callbackArgs_args(R13) // address of args vector |
| MOVD $0, R0 |
| MOVD R0, callbackArgs_result(R13) // result |
| |
| // Call cgocallback, which will call callbackWrap(frame). |
| MOVD $·callbackWrap<ABIInternal>(SB), R0 // PC of function to call, cgocallback takes an ABIInternal entry-point |
| MOVD R13, R1 // frame (&callbackArgs{...}) |
| MOVD $0, R2 // context |
| STP (R0, R1), (1*8)(RSP) |
| MOVD R2, (3*8)(RSP) |
| BL runtime·cgocallback(SB) |
| |
| // Get callback result. |
| MOVD $cbargs-(18*8+callbackArgs__size)(SP), R13 |
| MOVD callbackArgs_result(R13), R0 |
| |
| RESTORE_R19_TO_R28(8*9) |
| |
| RET |
| |
| // uint32 tstart_stdcall(M *newm); |
| TEXT runtime·tstart_stdcall(SB),NOSPLIT,$96-0 |
| SAVE_R19_TO_R28(8*3) |
| |
| MOVD m_g0(R0), g |
| MOVD R0, g_m(g) |
| BL runtime·save_g(SB) |
| |
| // Set up stack guards for OS stack. |
| MOVD RSP, R0 |
| MOVD R0, g_stack+stack_hi(g) |
| SUB $(64*1024), R0 |
| MOVD R0, (g_stack+stack_lo)(g) |
| MOVD R0, g_stackguard0(g) |
| MOVD R0, g_stackguard1(g) |
| |
| BL runtime·emptyfunc(SB) // fault if stack check is wrong |
| BL runtime·mstart(SB) |
| |
| RESTORE_R19_TO_R28(8*3) |
| |
| // Exit the thread. |
| MOVD $0, R0 |
| RET |
| |
| TEXT runtime·nanotime1(SB),NOSPLIT,$0-8 |
| MOVD $_INTERRUPT_TIME, R3 |
| MOVD time_lo(R3), R0 |
| MOVD $100, R1 |
| MUL R1, R0 |
| MOVD R0, ret+0(FP) |
| RET |
| |
| // This is called from rt0_go, which runs on the system stack |
| // using the initial stack allocated by the OS. |
| // It calls back into standard C using the BL below. |
| TEXT runtime·wintls(SB),NOSPLIT,$0 |
| // Allocate a TLS slot to hold g across calls to external code |
| MOVD runtime·_TlsAlloc(SB), R0 |
| SUB $16, RSP // skip over saved frame pointer below RSP |
| BL (R0) |
| ADD $16, RSP |
| |
| // Assert that slot is less than 64 so we can use _TEB->TlsSlots |
| CMP $64, R0 |
| BLT ok |
| // Fallback to the TEB arbitrary pointer. |
| // TODO: don't use the arbitrary pointer (see go.dev/issue/59824) |
| MOVD $TEB_ArbitraryPtr, R0 |
| B settls |
| ok: |
| |
| // Save offset from R18 into tls_g. |
| LSL $3, R0 |
| ADD $TEB_TlsSlots, R0 |
| settls: |
| MOVD R0, runtime·tls_g(SB) |
| RET |
