bd0918c910
Since libgloss provides a default syscall table for arches, use that to provide the default syscall table for ports. Only the exceptions need to be enumerated now with the common logic as the default.
215 lines
7.2 KiB
Python
Executable file
215 lines
7.2 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (C) 1996-2021 Free Software Foundation, Inc.
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#
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# This file is part of the GNU simulators.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""Helper to generate nltvals.def.
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nltvals.def is a file that describes various newlib/libgloss target values used
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by the host/target interface. This needs to be rerun whenever the newlib source
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changes. Developers manually run it.
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If the path to newlib is not specified, it will be searched for in:
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- the root of this source tree
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- alongside this source tree
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"""
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import argparse
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from pathlib import Path
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import re
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import subprocess
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import sys
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from typing import Iterable, List, TextIO
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PROG = Path(__file__).name
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# Unfortunately, many newlib/libgloss ports have seen fit to define their own
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# syscall.h file. This means that system call numbers can vary for each port.
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# Support for all this crud is kept here, rather than trying to get too fancy.
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# If you want to try to improve this, please do, but don't break anything.
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#
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# If a target isn't listed here, it gets the standard syscall.h file (see
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# libgloss/syscall.h) which hopefully new targets will use.
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#
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# NB: New ports should use libgloss, not newlib.
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TARGET_DIRS = {
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'cr16': 'libgloss/cr16/sys',
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'd10v': 'newlib/libc/sys/d10v/sys',
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'i960': 'libgloss/i960',
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'mcore': 'libgloss/mcore',
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'riscv': 'libgloss/riscv/machine',
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'sh': 'newlib/libc/sys/sh/sys',
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'v850': 'libgloss/v850/sys',
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}
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# The header for the generated def file.
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FILE_HEADER = f"""\
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/* Newlib/libgloss macro values needed by remote target support. */
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/* This file is machine generated by {PROG}. */\
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"""
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def gentvals(output: TextIO, cpp: str, srctype: str, srcdir: Path,
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headers: Iterable[str],
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pattern: str,
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target: str = None):
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"""Extract constants from the specified files using a regular expression.
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We'll run things through the preprocessor.
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"""
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headers = tuple(headers)
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# Require all files exist in order to regenerate properly.
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for header in headers:
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fullpath = srcdir / header
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assert fullpath.exists(), f'{fullpath} does not exist'
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if target is not None:
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print(f'#ifdef NL_TARGET_{target}', file=output)
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print(f'#ifdef {srctype}_defs', file=output)
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print('\n'.join(f'/* from {x} */' for x in headers), file=output)
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if target is None:
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print(f'/* begin {srctype} target macros */', file=output)
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else:
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print(f'/* begin {target} {srctype} target macros */', file=output)
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# Extract all the symbols.
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srcfile = ''.join(f'#include <{x}>\n' for x in headers)
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syms = set()
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define_pattern = re.compile(r'^#\s*define\s+(' + pattern + ')')
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for header in headers:
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with open(srcdir / header, 'r', encoding='utf-8') as fp:
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data = fp.read()
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for line in data.splitlines():
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m = define_pattern.match(line)
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if m:
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syms.add(m.group(1))
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for sym in sorted(syms):
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srcfile += f'#ifdef {sym}\nDEFVAL {{ "{sym}", {sym} }},\n#endif\n'
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result = subprocess.run(
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f'{cpp} -E -I"{srcdir}" -', shell=True, check=True, encoding='utf-8',
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input=srcfile, capture_output=True)
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for line in result.stdout.splitlines():
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if line.startswith('DEFVAL '):
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print(line[6:].rstrip(), file=output)
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print(f'#undef {srctype}_defs', file=output)
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if target is None:
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print(f'/* end {srctype} target macros */', file=output)
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else:
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print(f'/* end {target} {srctype} target macros */', file=output)
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print('#endif', file=output)
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print('#endif', file=output)
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def gen_common(output: TextIO, newlib: Path, cpp: str):
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"""Generate the common C library constants.
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No arch should override these.
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"""
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gentvals(output, cpp, 'errno', newlib / 'newlib/libc/include',
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('errno.h', 'sys/errno.h'), 'E[A-Z0-9]*')
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gentvals(output, cpp, 'signal', newlib / 'newlib/libc/include',
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('signal.h', 'sys/signal.h'), r'SIG[A-Z0-9]*')
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gentvals(output, cpp, 'open', newlib / 'newlib/libc/include',
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('fcntl.h', 'sys/fcntl.h', 'sys/_default_fcntl.h'), r'O_[A-Z0-9]*')
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def gen_targets(output: TextIO, newlib: Path, cpp: str):
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"""Generate the target-specific lists."""
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for target, subdir in sorted(TARGET_DIRS.items()):
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gentvals(output, cpp, 'sys', newlib / subdir, ('syscall.h',),
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r'SYS_[_a-zA-Z0-9]*', target=target)
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# Then output the common syscall targets.
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gentvals(output, cpp, 'sys', newlib / 'libgloss', ('syscall.h',),
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r'SYS_[_a-zA-Z0-9]*')
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def gen(output: TextIO, newlib: Path, cpp: str):
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"""Generate all the things!"""
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print(FILE_HEADER, file=output)
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gen_common(output, newlib, cpp)
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gen_targets(output, newlib, cpp)
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def get_parser() -> argparse.ArgumentParser:
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"""Get CLI parser."""
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parser = argparse.ArgumentParser(
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description=__doc__,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument(
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'-o', '--output', type=Path,
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help='write to the specified file instead of stdout')
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parser.add_argument(
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'--cpp', type=str, default='cpp',
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help='the preprocessor to use')
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parser.add_argument(
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'--srcroot', type=Path,
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help='the root of this source tree')
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parser.add_argument(
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'newlib', nargs='?', type=Path,
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help='path to the newlib+libgloss source tree')
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return parser
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def parse_args(argv: List[str]) -> argparse.Namespace:
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"""Process the command line & default options."""
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parser = get_parser()
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opts = parser.parse_args(argv)
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if opts.srcroot is None:
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opts.srcroot = Path(__file__).resolve().parent.parent.parent
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if opts.newlib is None:
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# Try to find newlib relative to our source tree.
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if (opts.srcroot / 'newlib').is_dir():
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# If newlib is manually in the same source tree, use it.
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if (opts.srcroot / 'libgloss').is_dir():
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opts.newlib = opts.srcroot
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else:
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opts.newlib = opts.srcroot / 'newlib'
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elif (opts.srcroot.parent / 'newlib').is_dir():
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# Or see if it's alongside the gdb/binutils repo.
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opts.newlib = opts.srcroot.parent / 'newlib'
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if opts.newlib is None or not opts.newlib.is_dir():
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parser.error('unable to find newlib')
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return opts
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def main(argv: List[str]) -> int:
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"""The main entry point for scripts."""
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opts = parse_args(argv)
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if opts.output is not None:
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output = open(opts.output, 'w', encoding='utf-8')
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else:
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output = sys.stdout
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gen(output, opts.newlib, opts.cpp)
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return 0
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if __name__ == '__main__':
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sys.exit(main(sys.argv[1:]))
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