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Diffstat (limited to '')
| -rw-r--r-- | src/runtime/rt0_linux_ppc64le.s | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/runtime/rt0_linux_ppc64le.s b/src/runtime/rt0_linux_ppc64le.s new file mode 100644 index 0000000..417ada2 --- /dev/null +++ b/src/runtime/rt0_linux_ppc64le.s @@ -0,0 +1,101 @@ +// 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) |