github.com/c9s/go@v0.0.0-20180120015821-984e81f64e0c/src/runtime/rt0_linux_arm.s (about)

     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,$-4
     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,$0
    16  	B	_rt0_arm_lib(SB)
    17  
    18  TEXT _rt0_arm_linux1(SB),NOSPLIT,$-4
    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)