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
     7TEXT _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.
    15TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$0
    16	B	_rt0_arm_lib(SB)
    17
    18TEXT _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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