// Copyright 2018 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|NOFRAME,$0
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MOVM.DB.W [R4, R5, R14], (R13) // push {r4, r5, lr}
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MOVW R0, R4 // put libcall * in r4
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MOVW R13, R5 // save stack pointer in r5
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// SetLastError(0)
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MOVW $0, R0
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MRC 15, 0, R1, C13, C0, 2
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MOVW R0, 0x34(R1)
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MOVW 8(R4), R12 // libcall->args
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// Do we have more than 4 arguments?
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MOVW 4(R4), R0 // libcall->n
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SUB.S $4, R0, R2
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BLE loadregs
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// Reserve stack space for remaining args
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SUB R2<<2, R13
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BIC $0x7, R13 // alignment for ABI
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// R0: count of arguments
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// R1:
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// R2: loop counter, from 0 to (n-4)
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// R3: scratch
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// R4: pointer to libcall struct
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// R12: libcall->args
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MOVW $0, R2
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stackargs:
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ADD $4, R2, R3 // r3 = args[4 + i]
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MOVW R3<<2(R12), R3
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MOVW R3, R2<<2(R13) // stack[i] = r3
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ADD $1, R2 // i++
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SUB $4, R0, R3 // while (i < (n - 4))
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CMP R3, R2
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BLT stackargs
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loadregs:
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CMP $3, R0
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MOVW.GT 12(R12), R3
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CMP $2, R0
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MOVW.GT 8(R12), R2
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CMP $1, R0
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MOVW.GT 4(R12), R1
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CMP $0, R0
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MOVW.GT 0(R12), R0
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BIC $0x7, R13 // alignment for ABI
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MOVW 0(R4), R12 // branch to libcall->fn
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BL (R12)
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MOVW R5, R13 // free stack space
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MOVW R0, 12(R4) // save return value to libcall->r1
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MOVW R1, 16(R4)
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// GetLastError
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MRC 15, 0, R1, C13, C0, 2
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MOVW 0x34(R1), R0
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MOVW R0, 20(R4) // store in libcall->err
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MOVM.IA.W (R13), [R4, R5, R15]
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TEXT runtime·badsignal2(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R4, R14], (R13) // push {r4, lr}
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MOVW R13, R4 // save original stack pointer
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SUB $8, R13 // space for 2 variables
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BIC $0x7, R13 // alignment for ABI
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// stderr
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MOVW runtime·_GetStdHandle(SB), R1
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MOVW $-12, R0
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BL (R1)
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MOVW $runtime·badsignalmsg(SB), R1 // lpBuffer
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MOVW $runtime·badsignallen(SB), R2 // lpNumberOfBytesToWrite
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MOVW (R2), R2
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ADD $0x4, R13, R3 // lpNumberOfBytesWritten
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MOVW $0, R12 // lpOverlapped
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MOVW R12, (R13)
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MOVW runtime·_WriteFile(SB), R12
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BL (R12)
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MOVW R4, R13 // restore SP
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MOVM.IA.W (R13), [R4, R15] // pop {r4, pc}
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TEXT runtime·getlasterror(SB),NOSPLIT,$0
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MRC 15, 0, R0, C13, C0, 2
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MOVW 0x34(R0), R0
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MOVW R0, ret+0(FP)
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RET
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TEXT runtime·setlasterror(SB),NOSPLIT|NOFRAME,$0
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MRC 15, 0, R1, C13, C0, 2
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MOVW R0, 0x34(R1)
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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 R1
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// Return 0 for 'not handled', -1 for handled.
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// int32_t sigtramp(
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// PEXCEPTION_POINTERS ExceptionInfo,
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// func *GoExceptionHandler);
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TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R0, R4-R11, R14], (R13) // push {r0, r4-r11, lr} (SP-=40)
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SUB $(8+20), R13 // reserve space for g, sp, and
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// parameters/retval to go call
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MOVW R0, R6 // Save param0
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MOVW R1, R7 // Save param1
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BL runtime·load_g(SB)
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CMP $0, g // is there a current g?
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BL.EQ runtime·badsignal2(SB)
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// save g and SP in case of stack switch
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MOVW R13, 24(R13)
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MOVW g, 20(R13)
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// do we need to switch to the g0 stack?
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MOVW g, R5 // R5 = g
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MOVW g_m(R5), R2 // R2 = m
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MOVW m_g0(R2), R4 // R4 = g0
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CMP R5, R4 // if curg == g0
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BEQ g0
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// switch to g0 stack
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MOVW R4, g // g = g0
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MOVW (g_sched+gobuf_sp)(g), R3 // R3 = g->gobuf.sp
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BL runtime·save_g(SB)
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// traceback will think that we've done PUSH and SUB
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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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SUB $(40+8+20), R3
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MOVW R13, 24(R3) // save old stack pointer
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MOVW R3, R13 // switch stack
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g0:
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MOVW 0(R6), R2 // R2 = ExceptionPointers->ExceptionRecord
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MOVW 4(R6), R3 // R3 = ExceptionPointers->ContextRecord
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// make it look like mstart called us on g0, to stop traceback
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MOVW $runtime·mstart(SB), R4
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MOVW R4, 0(R13) // Save link register for traceback
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MOVW R2, 4(R13) // Move arg0 (ExceptionRecord) into position
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MOVW R3, 8(R13) // Move arg1 (ContextRecord) into position
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MOVW R5, 12(R13) // Move arg2 (original g) into position
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BL (R7) // Call the go routine
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MOVW 16(R13), R4 // Fetch return value from stack
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// Compute the value of the g0 stack pointer after deallocating
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// this frame, then allocating 8 bytes. We may need to store
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// the resume SP and PC on the g0 stack to work around
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// control flow guard when we resume from the exception.
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ADD $(40+20), R13, R12
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// switch back to original stack and g
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MOVW 24(R13), R13
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MOVW 20(R13), g
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BL runtime·save_g(SB)
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done:
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MOVW R4, R0 // move retval into position
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ADD $(8 + 20), R13 // free locals
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MOVM.IA.W (R13), [R3, R4-R11, R14] // pop {r3, r4-r11, lr}
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// if return value is CONTINUE_SEARCH, do not set up control
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// flow guard workaround
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CMP $0, R0
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BEQ return
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// Check if we need to set up the control flow guard workaround.
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// On Windows/ARM, the stack pointer must lie within system
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// stack limits when we resume from exception.
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// Store the resume SP and PC on the g0 stack,
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// and return to returntramp on the g0 stack. returntramp
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// pops the saved PC and SP from the g0 stack, resuming execution
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// at the desired location.
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// If returntramp has already been set up by a previous exception
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// handler, don't clobber the stored SP and PC on the stack.
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MOVW 4(R3), R3 // PEXCEPTION_POINTERS->Context
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MOVW 0x40(R3), R2 // load PC from context record
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MOVW $runtime·returntramp(SB), R1
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CMP R1, R2
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B.EQ return // do not clobber saved SP/PC
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// Save resume SP and PC on g0 stack
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MOVW 0x38(R3), R2 // load SP from context record
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MOVW R2, 0(R12) // Store resume SP on g0 stack
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MOVW 0x40(R3), R2 // load PC from context record
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MOVW R2, 4(R12) // Store resume PC on g0 stack
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// Set up context record to return to returntramp on g0 stack
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MOVW R12, 0x38(R3) // save g0 stack pointer
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// in context record
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MOVW $runtime·returntramp(SB), R2 // save resume address
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MOVW R2, 0x40(R3) // in context record
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return:
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B (R14) // return
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//
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// Trampoline to resume execution from exception handler.
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// This is part of the control flow guard workaround.
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// It switches stacks and jumps to the continuation address.
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//
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TEXT runtime·returntramp(SB),NOSPLIT|NOFRAME,$0
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MOVM.IA (R13), [R13, R15] // ldm sp, [sp, pc]
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TEXT runtime·exceptiontramp(SB),NOSPLIT|NOFRAME,$0
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MOVW $runtime·exceptionhandler(SB), R1
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B runtime·sigtramp(SB)
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TEXT runtime·firstcontinuetramp(SB),NOSPLIT|NOFRAME,$0
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MOVW $runtime·firstcontinuehandler(SB), R1
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B runtime·sigtramp(SB)
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TEXT runtime·lastcontinuetramp(SB),NOSPLIT|NOFRAME,$0
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MOVW $runtime·lastcontinuehandler(SB), R1
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B runtime·sigtramp(SB)
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TEXT runtime·ctrlhandler(SB),NOSPLIT|NOFRAME,$0
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MOVW $runtime·ctrlhandler1(SB), R1
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B runtime·externalthreadhandler(SB)
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TEXT runtime·profileloop(SB),NOSPLIT|NOFRAME,$0
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MOVW $runtime·profileloop1(SB), R1
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B runtime·externalthreadhandler(SB)
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// int32 externalthreadhandler(uint32 arg, int (*func)(uint32))
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// stack layout:
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// +----------------+
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// | callee-save |
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// | registers |
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// +----------------+
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// | m |
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// +----------------+
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// 20| g |
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// +----------------+
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// 16| func ptr (r1) |
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// +----------------+
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// 12| argument (r0) |
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//---+----------------+
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// 8 | param1 |
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// +----------------+
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// 4 | param0 |
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// +----------------+
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// 0 | retval |
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// +----------------+
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//
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TEXT runtime·externalthreadhandler(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R4-R11, R14], (R13) // push {r4-r11, lr}
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SUB $(m__size + g__size + 20), R13 // space for locals
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MOVW R0, 12(R13)
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MOVW R1, 16(R13)
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// zero out m and g structures
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ADD $20, R13, R0 // compute pointer to g
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MOVW R0, 4(R13)
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MOVW $(m__size + g__size), R0
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MOVW R0, 8(R13)
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BL runtime·memclrNoHeapPointers(SB)
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// initialize m and g structures
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ADD $20, R13, R2 // R2 = g
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ADD $(20 + g__size), R13, R3 // R3 = m
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MOVW R2, m_g0(R3) // m->g0 = g
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MOVW R3, g_m(R2) // g->m = m
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MOVW R2, m_curg(R3) // m->curg = g
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MOVW R2, g
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BL runtime·save_g(SB)
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// set up stackguard stuff
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MOVW R13, R0
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MOVW R0, g_stack+stack_hi(g)
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SUB $(32*1024), R0
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MOVW R0, (g_stack+stack_lo)(g)
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MOVW R0, g_stackguard0(g)
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MOVW R0, g_stackguard1(g)
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// move argument into position and call function
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MOVW 12(R13), R0
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MOVW R0, 4(R13)
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MOVW 16(R13), R1
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BL (R1)
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// clear g
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MOVW $0, g
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BL runtime·save_g(SB)
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MOVW 0(R13), R0 // load return value
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ADD $(m__size + g__size + 20), R13 // free locals
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MOVM.IA.W (R13), [R4-R11, R15] // pop {r4-r11, pc}
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GLOBL runtime·cbctxts(SB), NOPTR, $4
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TEXT runtime·callbackasm1(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R4-R11, R14], (R13) // push {r4-r11, lr}
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SUB $36, R13 // space for locals
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// save callback arguments to stack. We currently support up to 4 arguments
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ADD $16, R13, R4
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MOVM.IA [R0-R3], (R4)
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// load cbctxts[i]. The trampoline in zcallback_windows.s puts the callback
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// index in R12
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MOVW runtime·cbctxts(SB), R4
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MOVW R12<<2(R4), R4 // R4 holds pointer to wincallbackcontext structure
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// extract callback context
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MOVW wincallbackcontext_argsize(R4), R5
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MOVW wincallbackcontext_gobody(R4), R4
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// we currently support up to 4 arguments
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CMP $(4 * 4), R5
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BL.GT runtime·abort(SB)
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// extend argsize by size of return value
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ADD $4, R5
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// Build 'type args struct'
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MOVW R4, 4(R13) // fn
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ADD $16, R13, R0 // arg (points to r0-r3, ret on stack)
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MOVW R0, 8(R13)
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MOVW R5, 12(R13) // argsize
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BL runtime·load_g(SB)
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BL runtime·cgocallback_gofunc(SB)
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ADD $16, R13, R0 // load arg
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MOVW 12(R13), R1 // load argsize
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SUB $4, R1 // offset to return value
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MOVW R1<<0(R0), R0 // load return value
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ADD $36, R13 // free locals
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MOVM.IA.W (R13), [R4-R11, R15] // pop {r4-r11, pc}
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// uint32 tstart_stdcall(M *newm);
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TEXT runtime·tstart_stdcall(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R4-R11, R14], (R13) // push {r4-r11, lr}
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MOVW m_g0(R0), g
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MOVW R0, g_m(g)
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BL runtime·save_g(SB)
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// do per-thread TLS initialization
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BL runtime·init_thread_tls(SB)
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// Layout new m scheduler stack on os stack.
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MOVW R13, R0
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MOVW R0, g_stack+stack_hi(g)
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SUB $(64*1024), R0
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MOVW R0, (g_stack+stack_lo)(g)
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MOVW R0, g_stackguard0(g)
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MOVW R0, g_stackguard1(g)
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BL runtime·emptyfunc(SB) // fault if stack check is wrong
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BL runtime·mstart(SB)
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// Exit the thread.
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MOVW $0, R0
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MOVM.IA.W (R13), [R4-R11, R15] // pop {r4-r11, pc}
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// onosstack calls fn on OS stack.
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// adapted from asm_arm.s : systemstack
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// func onosstack(fn unsafe.Pointer, arg uint32)
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TEXT runtime·onosstack(SB),NOSPLIT,$0
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MOVW fn+0(FP), R5 // R5 = fn
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MOVW arg+4(FP), R6 // R6 = arg
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// This function can be called when there is no g,
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// for example, when we are handling a callback on a non-go thread.
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// In this case we're already on the system stack.
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CMP $0, g
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BEQ noswitch
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MOVW g_m(g), R1 // R1 = m
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MOVW m_gsignal(R1), R2 // R2 = gsignal
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CMP g, R2
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B.EQ noswitch
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MOVW m_g0(R1), R2 // R2 = g0
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CMP g, R2
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B.EQ noswitch
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MOVW m_curg(R1), R3
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CMP g, R3
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B.EQ switch
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// Bad: g is not gsignal, not g0, not curg. What is it?
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// Hide call from linker nosplit analysis.
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MOVW $runtime·badsystemstack(SB), R0
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BL (R0)
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B runtime·abort(SB)
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switch:
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// save our state in g->sched. Pretend to
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// be systemstack_switch if the G stack is scanned.
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MOVW $runtime·systemstack_switch(SB), R3
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ADD $4, R3, R3 // get past push {lr}
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MOVW R3, (g_sched+gobuf_pc)(g)
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MOVW R13, (g_sched+gobuf_sp)(g)
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MOVW LR, (g_sched+gobuf_lr)(g)
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MOVW g, (g_sched+gobuf_g)(g)
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// switch to g0
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MOVW R2, g
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MOVW (g_sched+gobuf_sp)(R2), R3
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// make it look like mstart called systemstack on g0, to stop traceback
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SUB $4, R3, R3
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MOVW $runtime·mstart(SB), R4
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MOVW R4, 0(R3)
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MOVW R3, R13
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// call target function
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MOVW R6, R0 // arg
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BL (R5)
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// switch back to g
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MOVW g_m(g), R1
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MOVW m_curg(R1), g
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MOVW (g_sched+gobuf_sp)(g), R13
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MOVW $0, R3
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MOVW R3, (g_sched+gobuf_sp)(g)
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RET
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noswitch:
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// Using a tail call here cleans up tracebacks since we won't stop
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// at an intermediate systemstack.
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MOVW.P 4(R13), R14 // restore LR
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MOVW R6, R0 // arg
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B (R5)
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// Runs on OS stack. Duration (in 100ns units) is in R0.
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TEXT runtime·usleep2(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R4, R14], (R13) // push {r4, lr}
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MOVW R13, R4 // Save SP
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SUB $8, R13 // R13 = R13 - 8
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BIC $0x7, R13 // Align SP for ABI
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RSB $0, R0, R3 // R3 = -R0
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MOVW $0, R1 // R1 = FALSE (alertable)
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MOVW $-1, R0 // R0 = handle
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MOVW R13, R2 // R2 = pTime
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MOVW R3, 0(R2) // time_lo
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MOVW R0, 4(R2) // time_hi
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MOVW runtime·_NtWaitForSingleObject(SB), R3
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BL (R3)
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MOVW R4, R13 // Restore SP
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MOVM.IA.W (R13), [R4, R15] // pop {R4, pc}
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// Runs on OS stack.
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TEXT runtime·switchtothread(SB),NOSPLIT|NOFRAME,$0
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MOVM.DB.W [R4, R14], (R13) // push {R4, lr}
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MOVW R13, R4
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BIC $0x7, R13 // alignment for ABI
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MOVW runtime·_SwitchToThread(SB), R0
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BL (R0)
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MOVW R4, R13 // restore stack pointer
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MOVM.IA.W (R13), [R4, R15] // pop {R4, pc}
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TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
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B runtime·armPublicationBarrier(SB)
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// never called (cgo not supported)
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TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
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MOVW $0xabcd, R0
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MOVW R0, (R0)
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RET
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// See http://www.dcl.hpi.uni-potsdam.de/research/WRK/2007/08/getting-os-information-the-kuser_shared_data-structure/
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// Must read hi1, then lo, then hi2. The snapshot is valid if hi1 == hi2.
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#define _INTERRUPT_TIME 0x7ffe0008
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#define _SYSTEM_TIME 0x7ffe0014
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#define time_lo 0
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#define time_hi1 4
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#define time_hi2 8
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TEXT runtime·nanotime(SB),NOSPLIT,$0-8
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MOVW $0, R0
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MOVB runtime·useQPCTime(SB), R0
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CMP $0, R0
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BNE useQPC
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MOVW $_INTERRUPT_TIME, R3
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loop:
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MOVW time_hi1(R3), R1
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MOVW time_lo(R3), R0
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MOVW time_hi2(R3), R2
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CMP R1, R2
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BNE loop
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// wintime = R1:R0, multiply by 100
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MOVW $100, R2
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MULLU R0, R2, (R4, R3) // R4:R3 = R1:R0 * R2
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MULA R1, R2, R4, R4
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// wintime*100 = R4:R3
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MOVW R3, ret_lo+0(FP)
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MOVW R4, ret_hi+4(FP)
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RET
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useQPC:
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B runtime·nanotimeQPC(SB) // tail call
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RET
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TEXT time·now(SB),NOSPLIT,$0-20
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MOVW $0, R0
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MOVB runtime·useQPCTime(SB), R0
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CMP $0, R0
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BNE useQPC
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MOVW $_INTERRUPT_TIME, R3
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loop:
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MOVW time_hi1(R3), R1
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MOVW time_lo(R3), R0
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MOVW time_hi2(R3), R2
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CMP R1, R2
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BNE loop
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// wintime = R1:R0, multiply by 100
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MOVW $100, R2
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MULLU R0, R2, (R4, R3) // R4:R3 = R1:R0 * R2
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MULA R1, R2, R4, R4
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// wintime*100 = R4:R3
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MOVW R3, mono+12(FP)
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MOVW R4, mono+16(FP)
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MOVW $_SYSTEM_TIME, R3
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wall:
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MOVW time_hi1(R3), R1
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MOVW time_lo(R3), R0
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MOVW time_hi2(R3), R2
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CMP R1, R2
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BNE wall
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// w = R1:R0 in 100ns untis
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// convert to Unix epoch (but still 100ns units)
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#define delta 116444736000000000
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SUB.S $(delta & 0xFFFFFFFF), R0
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SBC $(delta >> 32), R1
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// Convert to nSec
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MOVW $100, R2
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MULLU R0, R2, (R4, R3) // R4:R3 = R1:R0 * R2
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MULA R1, R2, R4, R4
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// w = R2:R1 in nSec
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MOVW R3, R1 // R4:R3 -> R2:R1
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MOVW R4, R2
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// multiply nanoseconds by reciprocal of 10**9 (scaled by 2**61)
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// to get seconds (96 bit scaled result)
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MOVW $0x89705f41, R3 // 2**61 * 10**-9
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MULLU R1,R3,(R6,R5) // R7:R6:R5 = R2:R1 * R3
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MOVW $0,R7
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MULALU R2,R3,(R7,R6)
|
|
// unscale by discarding low 32 bits, shifting the rest by 29
|
MOVW R6>>29,R6 // R7:R6 = (R7:R6:R5 >> 61)
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ORR R7<<3,R6
|
MOVW R7>>29,R7
|
|
// subtract (10**9 * sec) from nsec to get nanosecond remainder
|
MOVW $1000000000, R5 // 10**9
|
MULLU R6,R5,(R9,R8) // R9:R8 = R7:R6 * R5
|
MULA R7,R5,R9,R9
|
SUB.S R8,R1 // R2:R1 -= R9:R8
|
SBC R9,R2
|
|
// because reciprocal was a truncated repeating fraction, quotient
|
// may be slightly too small -- adjust to make remainder < 10**9
|
CMP R5,R1 // if remainder > 10**9
|
SUB.HS R5,R1 // remainder -= 10**9
|
ADD.HS $1,R6 // sec += 1
|
|
MOVW R6,sec_lo+0(FP)
|
MOVW R7,sec_hi+4(FP)
|
MOVW R1,nsec+8(FP)
|
RET
|
useQPC:
|
B runtime·nanotimeQPC(SB) // tail call
|
RET
|
|
// save_g saves the g register (R10) into thread local memory
|
// so that we can call externally compiled
|
// ARM code that will overwrite those registers.
|
// NOTE: runtime.gogo assumes that R1 is preserved by this function.
|
// runtime.mcall assumes this function only clobbers R0 and R11.
|
// Returns with g in R0.
|
// Save the value in the _TEB->TlsSlots array.
|
// Effectively implements TlsSetValue().
|
// tls_g stores the TLS slot allocated TlsAlloc().
|
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0
|
MRC 15, 0, R0, C13, C0, 2
|
ADD $0xe10, R0
|
MOVW $runtime·tls_g(SB), R11
|
MOVW (R11), R11
|
MOVW g, R11<<2(R0)
|
MOVW g, R0 // preserve R0 across call to setg<>
|
RET
|
|
// load_g loads the g register from thread-local memory,
|
// for use after calling externally compiled
|
// ARM code that overwrote those registers.
|
// Get the value from the _TEB->TlsSlots array.
|
// Effectively implements TlsGetValue().
|
TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0
|
MRC 15, 0, R0, C13, C0, 2
|
ADD $0xe10, R0
|
MOVW $runtime·tls_g(SB), g
|
MOVW (g), g
|
MOVW g<<2(R0), g
|
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.
|
// To do that, the stack pointer must be 8-byte-aligned.
|
TEXT runtime·_initcgo(SB),NOSPLIT|NOFRAME,$0
|
MOVM.DB.W [R4, R14], (R13) // push {r4, lr}
|
|
// Ensure stack is 8-byte aligned before calling C code
|
MOVW R13, R4
|
BIC $0x7, R13
|
|
// Allocate a TLS slot to hold g across calls to external code
|
MOVW $runtime·_TlsAlloc(SB), R0
|
MOVW (R0), R0
|
BL (R0)
|
|
// Assert that slot is less than 64 so we can use _TEB->TlsSlots
|
CMP $64, R0
|
MOVW $runtime·abort(SB), R1
|
BL.GE (R1)
|
|
// Save Slot into tls_g
|
MOVW $runtime·tls_g(SB), R1
|
MOVW R0, (R1)
|
|
BL runtime·init_thread_tls(SB)
|
|
MOVW R4, R13
|
MOVM.IA.W (R13), [R4, R15] // pop {r4, pc}
|
|
// void init_thread_tls()
|
//
|
// Does per-thread TLS initialization. Saves a pointer to the TLS slot
|
// holding G, in the current m.
|
//
|
// g->m->tls[0] = &_TEB->TlsSlots[tls_g]
|
//
|
// The purpose of this is to enable the profiling handler to get the
|
// current g associated with the thread. We cannot use m->curg because curg
|
// only holds the current user g. If the thread is executing system code or
|
// external code, m->curg will be NULL. The thread's TLS slot always holds
|
// the current g, so save a reference to this location so the profiling
|
// handler can get the real g from the thread's m.
|
//
|
// Clobbers R0-R3
|
TEXT runtime·init_thread_tls(SB),NOSPLIT|NOFRAME,$0
|
// compute &_TEB->TlsSlots[tls_g]
|
MRC 15, 0, R0, C13, C0, 2
|
ADD $0xe10, R0
|
MOVW $runtime·tls_g(SB), R1
|
MOVW (R1), R1
|
MOVW R1<<2, R1
|
ADD R1, R0
|
|
// save in g->m->tls[0]
|
MOVW g_m(g), R1
|
MOVW R0, m_tls(R1)
|
RET
|
|
// Holds the TLS Slot, which was allocated by TlsAlloc()
|
GLOBL runtime·tls_g+0(SB), NOPTR, $4
|
