rt0_aix_ppc64.s

Documentation: runtime

     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.
    10DEFINE_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
    18TEXT __start<>(SB),NOSPLIT,$-8
    19	XOR R0, R0
    20	MOVD $libc___n_pthreads(SB), R4
    21	MOVD 0(R4), R4
    22	MOVD $libc___mod_init(SB), R5
    23	MOVD 0(R5), R5
    24	MOVD 0(R19), R0
    25	MOVD R2, 40(R1)
    26	MOVD 8(R19), R2
    27	MOVD R18, R3
    28	MOVD R0, CTR
    29	BL (CTR) // Return to AIX loader
    30
    31	// Launch rt0_go
    32	MOVD 40(R1), R2
    33	MOVD R14, R3 // argc
    34	MOVD R15, R4 // argv
    35	BL _main(SB)
    36
    37
    38DEFINE_PPC64X_FUNCDESC(main, _main)
    39TEXT _main(SB),NOSPLIT,$-8
    40	MOVD $runtime·rt0_go(SB), R12
    41	MOVD R12, CTR
    42	BR (CTR)
    43
    44TEXT _rt0_ppc64_aix_lib(SB),NOSPLIT,$0
    45	MOVD R14, R3 // argc
    46	MOVD R15, R4 // argv
    47	JMP _rt0_ppc64x_lib(SB)
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