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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" #include "asm_ppc64x.h" #include "cgo/abi_ppc64x.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|NOFRAME,$0 // This is called with ELFv2 calling conventions. Convert to Go. // Allocate argument storage for call to newosproc0. STACK_AND_SAVE_HOST_TO_GO_ABI(16) MOVD R3, _rt0_ppc64le_linux_lib_argc<>(SB) MOVD R4, _rt0_ppc64le_linux_lib_argv<>(SB) // Synchronous initialization. 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+FIXED_FRAME(R1) MOVD $_rt0_ppc64le_linux_lib_go(SB), R12 MOVD R12, 16+FIXED_FRAME(R1) MOVD $runtime·newosproc0(SB),R12 MOVD R12, CTR BL (CTR) done: // Restore and return to ELFv2 caller. UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(16) 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 dynamically 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)