rt0_aix_ppc64.s

     1  // Copyright 2018 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  #include "asm_ppc64x.h"
     7  
     8  // _rt0_ppc64_aix is a function descriptor of the entrypoint function
     9  // __start. This name is needed by cmd/link.
    10  DEFINE_PPC64X_FUNCDESC(_rt0_ppc64_aix, __start<>)
    11  
    12  // The starting function must return in the loader to
    13  // initialise some libraries, especially libthread which
    14  // creates the main thread and adds the TLS in R13
    15  // R19 contains a function descriptor to the loader function
    16  // which needs to be called.
    17  // This code is similar to the __start function in C
    18  TEXT __start<>(SB),NOSPLIT,$-8
    19  	XOR R0, R0
    20  	MOVD $libc___n_pthreads(SB), R4
    21  	MOVD 0(R4), R4
    22  	MOVD $libc___mod_init(SB), R5
    23  	MOVD 0(R5), R5
    24  	MOVD 0(R19), R0
    25  	MOVD R2, 40(R1)
    26  	MOVD 8(R19), R2
    27  	MOVD R18, R3
    28  	MOVD R0, CTR
    29  	BL (CTR) // Return to AIX loader
    30  
    31  	// Launch rt0_go
    32  	MOVD 40(R1), R2
    33  	MOVD R14, R3 // argc
    34  	MOVD R15, R4 // argv
    35  	BL _main(SB)
    36  
    37  
    38  DEFINE_PPC64X_FUNCDESC(main, _main)
    39  TEXT _main(SB),NOSPLIT,$-8
    40  	MOVD $runtime·rt0_go(SB), R12
    41  	MOVD R12, CTR
    42  	BR (CTR)
    43  
    44  TEXT _rt0_ppc64_aix_lib(SB),NOSPLIT,$0
    45  	MOVD R14, R3 // argc
    46  	MOVD R15, R4 // argv
    47  	JMP _rt0_ppc64x_lib(SB)
    48
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