Text file src/runtime/cgo/gcc_aix_ppc64.c

     1	// Copyright 2019 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	// +build aix
     6	// +build ppc64 ppc64le
     7	
     8	/*
     9	 * On AIX, call to _cgo_topofstack and Go main are forced to be a longcall.
    10	 * Without it, ld might add trampolines in the middle of .text section
    11	 * to reach these functions which are normally declared in runtime package.
    12	 */
    13	extern int __attribute__((longcall)) __cgo_topofstack(void);
    14	extern int __attribute__((longcall)) runtime_rt0_go(int argc, char **argv);
    15	extern void __attribute__((longcall)) _rt0_ppc64_aix_lib(void);
    16	
    17	int _cgo_topofstack(void) {
    18		return __cgo_topofstack();
    19	}
    20	
    21	int main(int argc, char **argv) {
    22		return runtime_rt0_go(argc, argv);
    23	}
    24	
    25	static void libinit(void) __attribute__ ((constructor));
    26	
    27	/*
    28	 * libinit aims to replace .init_array section which isn't available on aix.
    29	 * Using __attribute__ ((constructor)) let gcc handles this instead of
    30	 * adding special code in cmd/link.
    31	 * However, it will be called for every Go programs which has cgo.
    32	 * Inside _rt0_ppc64_aix_lib(), runtime.isarchive is checked in order
    33	 * to know if this program is a c-archive or a simple cgo program.
    34	 * If it's not set, _rt0_ppc64_ax_lib() returns directly.
    35	 */
    36	static void libinit() {
    37		_rt0_ppc64_aix_lib();
    38	}

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