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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "go_asm.h"
#include "textflag.h"
TEXT _rt0_ppc64le_linux(SB),NOSPLIT,$0
XOR R0, R0 // Make sure R0 is zero before _main
BR _main<>(SB)
TEXT _rt0_ppc64le_linux_lib(SB),NOSPLIT,$-8
// Start with standard C stack frame layout and linkage.
MOVD LR, R0
MOVD R0, 16(R1) // Save LR in caller's frame.
MOVW CR, R0 // Save CR in caller's frame
MOVD R0, 8(R1)
MOVDU R1, -320(R1) // Allocate frame.
// Preserve callee-save registers.
MOVD R14, 24(R1)
MOVD R15, 32(R1)
MOVD R16, 40(R1)
MOVD R17, 48(R1)
MOVD R18, 56(R1)
MOVD R19, 64(R1)
MOVD R20, 72(R1)
MOVD R21, 80(R1)
MOVD R22, 88(R1)
MOVD R23, 96(R1)
MOVD R24, 104(R1)
MOVD R25, 112(R1)
MOVD R26, 120(R1)
MOVD R27, 128(R1)
MOVD R28, 136(R1)
MOVD R29, 144(R1)
MOVD g, 152(R1) // R30
MOVD R31, 160(R1)
FMOVD F14, 168(R1)
FMOVD F15, 176(R1)
FMOVD F16, 184(R1)
FMOVD F17, 192(R1)
FMOVD F18, 200(R1)
FMOVD F19, 208(R1)
FMOVD F20, 216(R1)
FMOVD F21, 224(R1)
FMOVD F22, 232(R1)
FMOVD F23, 240(R1)
FMOVD F24, 248(R1)
FMOVD F25, 256(R1)
FMOVD F26, 264(R1)
FMOVD F27, 272(R1)
FMOVD F28, 280(R1)
FMOVD F29, 288(R1)
FMOVD F30, 296(R1)
FMOVD F31, 304(R1)
MOVD R3, _rt0_ppc64le_linux_lib_argc<>(SB)
MOVD R4, _rt0_ppc64le_linux_lib_argv<>(SB)
// Synchronous initialization.
MOVD $runtime·reginit(SB), R12
MOVD R12, CTR
BL (CTR)
MOVD $runtime·libpreinit(SB), R12
MOVD R12, CTR
BL (CTR)
// Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R12
CMP $0, R12
BEQ nocgo
MOVD $_rt0_ppc64le_linux_lib_go(SB), R3
MOVD $0, R4
MOVD R12, CTR
BL (CTR)
BR done
nocgo:
MOVD $0x800000, R12 // stacksize = 8192KB
MOVD R12, 8(R1)
MOVD $_rt0_ppc64le_linux_lib_go(SB), R12
MOVD R12, 16(R1)
MOVD $runtime·newosproc0(SB),R12
MOVD R12, CTR
BL (CTR)
done:
// Restore saved registers.
MOVD 24(R1), R14
MOVD 32(R1), R15
MOVD 40(R1), R16
MOVD 48(R1), R17
MOVD 56(R1), R18
MOVD 64(R1), R19
MOVD 72(R1), R20
MOVD 80(R1), R21
MOVD 88(R1), R22
MOVD 96(R1), R23
MOVD 104(R1), R24
MOVD 112(R1), R25
MOVD 120(R1), R26
MOVD 128(R1), R27
MOVD 136(R1), R28
MOVD 144(R1), R29
MOVD 152(R1), g // R30
MOVD 160(R1), R31
FMOVD 168(R1), F14
FMOVD 176(R1), F15
FMOVD 184(R1), F16
FMOVD 192(R1), F17
FMOVD 200(R1), F18
FMOVD 208(R1), F19
FMOVD 216(R1), F20
FMOVD 224(R1), F21
FMOVD 232(R1), F22
FMOVD 240(R1), F23
FMOVD 248(R1), F24
FMOVD 256(R1), F25
FMOVD 264(R1), F26
FMOVD 272(R1), F27
FMOVD 280(R1), F28
FMOVD 288(R1), F29
FMOVD 296(R1), F30
FMOVD 304(R1), F31
ADD $320, R1
MOVD 8(R1), R0
MOVFL R0, $0xff
MOVD 16(R1), R0
MOVD R0, LR
RET
TEXT _rt0_ppc64le_linux_lib_go(SB),NOSPLIT,$0
MOVD _rt0_ppc64le_linux_lib_argc<>(SB), R3
MOVD _rt0_ppc64le_linux_lib_argv<>(SB), R4
MOVD $runtime·rt0_go(SB), R12
MOVD R12, CTR
BR (CTR)
DATA _rt0_ppc64le_linux_lib_argc<>(SB)/8, $0
GLOBL _rt0_ppc64le_linux_lib_argc<>(SB),NOPTR, $8
DATA _rt0_ppc64le_linux_lib_argv<>(SB)/8, $0
GLOBL _rt0_ppc64le_linux_lib_argv<>(SB),NOPTR, $8
TEXT _main<>(SB),NOSPLIT,$-8
// In a statically linked binary, the stack contains argc,
// argv as argc string pointers followed by a NULL, envv as a
// sequence of string pointers followed by a NULL, and auxv.
// The TLS pointer should be initialized to 0.
//
// In an ELFv2 compliant dynamically linked binary, R3 contains argc,
// R4 contains argv, R5 contains envp, R6 contains auxv, and R13
// contains the TLS pointer.
//
// When loading via glibc, the first doubleword on the stack points
// to NULL a value. (that is *(uintptr)(R1) == 0). This is used to
// differentiate static vs dynamicly linked binaries.
//
// If loading with the musl loader, it doesn't follow the ELFv2 ABI. It
// passes argc/argv similar to the linux kernel, R13 (TLS) is
// initialized, and R3/R4 are undefined.
MOVD (R1), R12
CMP R0, R12
BEQ tls_and_argcv_in_reg
// Arguments are passed via the stack (musl loader or a static binary)
MOVD 0(R1), R3 // argc
ADD $8, R1, R4 // argv
// Did the TLS pointer get set? If so, don't change it (e.g musl).
CMP R0, R13
BNE tls_and_argcv_in_reg
MOVD $runtime·m0+m_tls(SB), R13 // TLS
ADD $0x7000, R13
tls_and_argcv_in_reg:
BR main(SB)
TEXT main(SB),NOSPLIT,$-8
MOVD $runtime·rt0_go(SB), R12
MOVD R12, CTR
BR (CTR)
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