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From: Florian Weimer <fw@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] Linux: Enhance glibcsyscalls.py to support listing system calls Date: Mon, 11 May 2020 20:23:49 +0000 (GMT) [thread overview] Message-ID: <20200511202349.AAE01383F874@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6fcb0272f76721a45e33061404120907e8c5dae4 commit 6fcb0272f76721a45e33061404120907e8c5dae4 Author: Florian Weimer <fweimer@redhat.com> Date: Mon May 11 22:23:34 2020 +0200 Linux: Enhance glibcsyscalls.py to support listing system calls The script can now be called to query the definition status of system call numbers across all architectures, like this: $ python3 sysdeps/unix/sysv/linux/glibcsyscalls.py query-syscall sync_file_range sync_file_range2 sync_file_range: defined: aarch64 alpha csky hppa i386 ia64 m68k microblaze mips/mips32 mips/mips64/n32 mips/mips64/n64 nios2 riscv/rv64 s390/s390-32 s390/s390-64 sh sparc/sparc32 sparc/sparc64 x86_64/64 x86_64/x32 undefined: arm powerpc/powerpc32 powerpc/powerpc64 sync_file_range2: defined: arm powerpc/powerpc32 powerpc/powerpc64 undefined: aarch64 alpha csky hppa i386 ia64 m68k microblaze mips/mips32 mips/mips64/n32 mips/mips64/n64 nios2 riscv/rv64 s390/s390-32 s390/s390-64 sh sparc/sparc32 sparc/sparc64 x86_64/64 x86_64/x32 This command lists the headers containing the system call numbers: $ python3 sysdeps/unix/sysv/linux/glibcsyscalls.py list-headers The argument parser code is based on a suggestion from Adhemerval Zanella. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Diff: --- sysdeps/unix/sysv/linux/glibcsyscalls.py | 84 +++++++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 1 deletion(-) diff --git a/sysdeps/unix/sysv/linux/glibcsyscalls.py b/sysdeps/unix/sysv/linux/glibcsyscalls.py index de4d707e48..8d45cd4333 100644 --- a/sysdeps/unix/sysv/linux/glibcsyscalls.py +++ b/sysdeps/unix/sysv/linux/glibcsyscalls.py @@ -17,9 +17,12 @@ # License along with the GNU C Library; if not, see # <http://www.gnu.org/licenses/>. +import os import re -import glibcextract +if __name__ != '__main__': + # When called as a main program, this is not needed. + import glibcextract def extract_system_call_name(macro): """Convert the macro name (with __NR_) to a system call name.""" @@ -168,3 +171,82 @@ def linux_kernel_version(cc): val = glibcextract.compute_c_consts(sym_data, cc)['LINUX_VERSION_CODE'] val = int(val) return ((val & 0xff0000) >> 16, (val & 0xff00) >> 8) + +class ArchSyscall: + """Canonical name and location of a syscall header.""" + + def __init__(self, name, path): + self.name = name + self.path = path + + def __repr__(self): + return 'ArchSyscall(name={!r}, patch={!r})'.format( + self.name, self.path) + +def list_arch_syscall_headers(topdir): + """A generator which returns all the ArchSyscall objects in a tree.""" + + sysdeps = os.path.join(topdir, 'sysdeps', 'unix', 'sysv', 'linux') + for root, dirs, files in os.walk(sysdeps): + if root != sysdeps: + for filename in files: + if filename == 'arch-syscall.h': + yield ArchSyscall( + name=os.path.relpath(root, sysdeps), + path=os.path.join(root, filename)) + +def __main(): + """Entry point when called as the main program.""" + + import argparse + import sys + + # Top-level directory of the source tree. + topdir = os.path.realpath(os.path.join( + os.path.dirname(os.path.realpath(__file__)), *('..',) * 4)) + + def get_parser(): + parser = argparse.ArgumentParser(description=__doc__) + subparsers = parser.add_subparsers(dest='command', required=True) + subparsers.add_parser('list-headers', + help='Print the absolute paths of all arch-syscall.h header files') + subparser = subparsers.add_parser('query-syscall', + help='Summarize the implementation status of system calls') + subparser.add_argument('syscalls', help='Which syscalls to check', + nargs='+') + return parser + parser = get_parser() + args = parser.parse_args() + + if args.command == 'list-headers': + for header in sorted([syscall.path for syscall + in list_arch_syscall_headers(topdir)]): + print(header) + + elif args.command == 'query-syscall': + # List of system call tables. + tables = sorted(list_arch_syscall_headers(topdir), + key=lambda syscall: syscall.name) + for table in tables: + table.numbers = load_arch_syscall_header(table.path) + + for nr in args.syscalls: + defined = [table.name for table in tables + if nr in table.numbers] + undefined = [table.name for table in tables + if nr not in table.numbers] + if not defined: + print('{}: not defined on any architecture'.format(nr)) + elif not undefined: + print('{}: defined on all architectures'.format(nr)) + else: + print('{}:'.format(nr)) + print(' defined: {}'.format(' '.join(defined))) + print(' undefined: {}'.format(' '.join(undefined))) + + else: + # Unrecognized command. + usage(1) + +if __name__ == '__main__': + __main()
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