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Viewing File: sys_windows_arm64.s
// 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
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