forked from OSchip/llvm-project
80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
//===-- Classes to capture properites of linux applications -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_CONFIG_LINUX_APP_H
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#define LLVM_LIBC_CONFIG_LINUX_APP_H
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#include "src/__support/architectures.h"
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#include <stdint.h>
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namespace __llvm_libc {
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// Data structure to capture properties of the linux/ELF TLS.
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struct TLS {
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// The load address of the TLS.
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uintptr_t address;
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// The bytes size of the TLS.
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uintptr_t size;
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// The alignment of the TLS layout. It assumed that the alignment
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// value is a power of 2.
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uintptr_t align;
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};
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#if defined(LLVM_LIBC_ARCH_X86_64) || defined(LLVM_LIBC_ARCH_AARCH64)
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// At the language level, argc is an int. But we use uint64_t as the x86_64
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// ABI specifies it as an 8 byte value. Likewise, in the ARM64 ABI, arguments
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// are usually passed in registers. x0 is a doubleword register, so this is
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// 64 bit for aarch64 as well.
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typedef uint64_t ArgcType;
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// At the language level, argv is a char** value. However, we use uint64_t as
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// ABIs specify the argv vector be an |argc| long array of 8-byte values.
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typedef uint64_t ArgVEntryType;
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#else
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#error "argc and argv types are not defined for the target platform."
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#endif
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struct Args {
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ArgcType argc;
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// A flexible length array would be more suitable here, but C++ doesn't have
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// flexible arrays: P1039 proposes to fix this. So, for now we just fake it.
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// Even if argc is zero, "argv[argc] shall be a null pointer"
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// (ISO C 5.1.2.2.1) so one is fine. Also, length of 1 is not really wrong as
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// |argc| is guaranteed to be atleast 1, and there is an 8-byte null entry at
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// the end of the argv array.
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ArgVEntryType argv[1];
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};
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// Data structure which captures properties of a linux application.
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struct AppProperties {
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// Page size used for the application.
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uintptr_t pageSize;
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Args *args;
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// The properties of an application's TLS.
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TLS tls;
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// Environment data.
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uint64_t *envPtr;
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};
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extern AppProperties app;
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// Creates and initializes the TLS area for the current thread. Should not
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// be called before app.tls has been initialized.
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void initTLS();
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_CONFIG_LINUX_APP_H
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