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 $runtime·rt0_go(SB), R12
    41	MOVD R12, CTR
    42	BR (CTR)
    43
    44
    45TEXT _rt0_ppc64_aix_lib(SB),NOSPLIT,$-8
    46	// Start with standard C stack frame layout and linkage.
    47	MOVD	LR, R0
    48	MOVD	R0, 16(R1) // Save LR in caller's frame.
    49	MOVW	CR, R0	   // Save CR in caller's frame
    50	MOVD	R0, 8(R1)
    51
    52	MOVDU	R1, -344(R1) // Allocate frame.
    53
    54	// Preserve callee-save registers.
    55	MOVD	R14, 48(R1)
    56	MOVD	R15, 56(R1)
    57	MOVD	R16, 64(R1)
    58	MOVD	R17, 72(R1)
    59	MOVD	R18, 80(R1)
    60	MOVD	R19, 88(R1)
    61	MOVD	R20, 96(R1)
    62	MOVD	R21,104(R1)
    63	MOVD	R22, 112(R1)
    64	MOVD	R23, 120(R1)
    65	MOVD	R24, 128(R1)
    66	MOVD	R25, 136(R1)
    67	MOVD	R26, 144(R1)
    68	MOVD	R27, 152(R1)
    69	MOVD	R28, 160(R1)
    70	MOVD	R29, 168(R1)
    71	MOVD	g, 176(R1) // R30
    72	MOVD	R31, 184(R1)
    73	FMOVD	F14, 192(R1)
    74	FMOVD	F15, 200(R1)
    75	FMOVD	F16, 208(R1)
    76	FMOVD	F17, 216(R1)
    77	FMOVD	F18, 224(R1)
    78	FMOVD	F19, 232(R1)
    79	FMOVD	F20, 240(R1)
    80	FMOVD	F21, 248(R1)
    81	FMOVD	F22, 256(R1)
    82	FMOVD	F23, 264(R1)
    83	FMOVD	F24, 272(R1)
    84	FMOVD	F25, 280(R1)
    85	FMOVD	F26, 288(R1)
    86	FMOVD	F27, 296(R1)
    87	FMOVD	F28, 304(R1)
    88	FMOVD	F29, 312(R1)
    89	FMOVD	F30, 320(R1)
    90	FMOVD	F31, 328(R1)
    91
    92	// Synchronous initialization.
    93	MOVD	$runtime·reginit(SB), R12
    94	MOVD	R12, CTR
    95	BL	(CTR)
    96
    97	MOVBZ	runtime·isarchive(SB), R3	// Check buildmode = c-archive
    98	CMP		$0, R3
    99	BEQ		done
   100
   101	MOVD	R14, _rt0_ppc64_aix_lib_argc<>(SB)
   102	MOVD	R15, _rt0_ppc64_aix_lib_argv<>(SB)
   103
   104	MOVD	$runtime·libpreinit(SB), R12
   105	MOVD	R12, CTR
   106	BL	(CTR)
   107
   108	// Create a new thread to do the runtime initialization and return.
   109	MOVD	_cgo_sys_thread_create(SB), R12
   110	CMP	$0, R12
   111	BEQ	nocgo
   112	MOVD	$_rt0_ppc64_aix_lib_go(SB), R3
   113	MOVD	$0, R4
   114	MOVD	R2, 40(R1)
   115	MOVD	8(R12), R2
   116	MOVD	(R12), R12
   117	MOVD	R12, CTR
   118	BL	(CTR)
   119	MOVD	40(R1), R2
   120	BR	done
   121
   122nocgo:
   123	MOVD	$0x800000, R12					   // stacksize = 8192KB
   124	MOVD	R12, 8(R1)
   125	MOVD	$_rt0_ppc64_aix_lib_go(SB), R12
   126	MOVD	R12, 16(R1)
   127	MOVD	$runtime·newosproc0(SB),R12
   128	MOVD	R12, CTR
   129	BL	(CTR)
   130
   131done:
   132	// Restore saved registers.
   133	MOVD	48(R1), R14
   134	MOVD	56(R1), R15
   135	MOVD	64(R1), R16
   136	MOVD	72(R1), R17
   137	MOVD	80(R1), R18
   138	MOVD	88(R1), R19
   139	MOVD	96(R1), R20
   140	MOVD	104(R1), R21
   141	MOVD	112(R1), R22
   142	MOVD	120(R1), R23
   143	MOVD	128(R1), R24
   144	MOVD	136(R1), R25
   145	MOVD	144(R1), R26
   146	MOVD	152(R1), R27
   147	MOVD	160(R1), R28
   148	MOVD	168(R1), R29
   149	MOVD	176(R1), g // R30
   150	MOVD	184(R1), R31
   151	FMOVD	196(R1), F14
   152	FMOVD	200(R1), F15
   153	FMOVD	208(R1), F16
   154	FMOVD	216(R1), F17
   155	FMOVD	224(R1), F18
   156	FMOVD	232(R1), F19
   157	FMOVD	240(R1), F20
   158	FMOVD	248(R1), F21
   159	FMOVD	256(R1), F22
   160	FMOVD	264(R1), F23
   161	FMOVD	272(R1), F24
   162	FMOVD	280(R1), F25
   163	FMOVD	288(R1), F26
   164	FMOVD	296(R1), F27
   165	FMOVD	304(R1), F28
   166	FMOVD	312(R1), F29
   167	FMOVD	320(R1), F30
   168	FMOVD	328(R1), F31
   169
   170	ADD	$344, R1
   171
   172	MOVD	8(R1), R0
   173	MOVFL	R0, $0xff
   174	MOVD	16(R1), R0
   175	MOVD	R0, LR
   176	RET
   177
   178DEFINE_PPC64X_FUNCDESC(_rt0_ppc64_aix_lib_go, __rt0_ppc64_aix_lib_go)
   179
   180TEXT __rt0_ppc64_aix_lib_go(SB),NOSPLIT,$0
   181	MOVD	_rt0_ppc64_aix_lib_argc<>(SB), R3
   182	MOVD	_rt0_ppc64_aix_lib_argv<>(SB), R4
   183	MOVD	$runtime·rt0_go(SB), R12
   184	MOVD	R12, CTR
   185	BR	(CTR)
   186
   187DATA _rt0_ppc64_aix_lib_argc<>(SB)/8, $0
   188GLOBL _rt0_ppc64_aix_lib_argc<>(SB),NOPTR, $8
   189DATA _rt0_ppc64_aix_lib_argv<>(SB)/8, $0
   190GLOBL _rt0_ppc64_aix_lib_argv<>(SB),NOPTR, $8
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