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Text file src/runtime/rt0_linux_arm.s

Documentation: runtime

     1	// Copyright 2009 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	#include "textflag.h"
     6	
     7	TEXT _rt0_arm_linux(SB),NOSPLIT|NOFRAME,$0
     8		MOVW	(R13), R0	// argc
     9		MOVW	$4(R13), R1		// argv
    10		MOVW	$_rt0_arm_linux1(SB), R4
    11		B		(R4)
    12	
    13	// When building with -buildmode=c-shared, this symbol is called when the shared
    14	// library is loaded.
    15	TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$0
    16		B	_rt0_arm_lib(SB)
    17	
    18	TEXT _rt0_arm_linux1(SB),NOSPLIT|NOFRAME,$0
    19		// We first need to detect the kernel ABI, and warn the user
    20		// if the system only supports OABI.
    21		// The strategy here is to call some EABI syscall to see if
    22		// SIGILL is received.
    23		// If you get a SIGILL here, you have the wrong kernel.
    24	
    25		// Save argc and argv (syscall will clobber at least R0).
    26		MOVM.DB.W [R0-R1], (R13)
    27	
    28		// do an EABI syscall
    29		MOVW	$20, R7 // sys_getpid
    30		SWI	$0 // this will trigger SIGILL on OABI systems
    31	
    32		MOVM.IA.W (R13), [R0-R1]
    33		B	runtime·rt0_go(SB)

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