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159 lines
5.8 KiB
159 lines
5.8 KiB
#!/usr/bin/env python3
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#
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import sys, cpp, kernel, glob, os, re, getopt, clean_header, shutil
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from defaults import *
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from utils import *
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def Usage():
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print("""\
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usage: %(progname)s [kernel-original-path] [kernel-modified-path]
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this program is used to update all the auto-generated clean headers
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used by the Bionic C library. it assumes the following:
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- a set of source kernel headers is located in
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'external/kernel-headers/original', relative to the current
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android tree
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- a set of manually modified kernel header files located in
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'external/kernel-headers/modified', relative to the current
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android tree
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- the clean headers will be placed in 'bionic/libc/kernel/arch-<arch>/asm',
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'bionic/libc/kernel/android', etc..
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""" % { "progname" : os.path.basename(sys.argv[0]) })
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sys.exit(0)
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def ProcessFiles(updater, original_dir, modified_dir, src_rel_dir, update_rel_dir):
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# Delete the old headers before updating to the new headers.
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update_dir = os.path.join(get_kernel_dir(), update_rel_dir)
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shutil.rmtree(update_dir)
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os.mkdir(update_dir, 0o755)
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src_dir = os.path.normpath(os.path.join(original_dir, src_rel_dir))
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src_dir_len = len(src_dir) + 1
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mod_src_dir = os.path.join(modified_dir, src_rel_dir)
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update_dir = os.path.join(get_kernel_dir(), update_rel_dir)
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kernel_dir = get_kernel_dir()
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for root, _, files in os.walk(src_dir):
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for file in sorted(files):
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_, ext = os.path.splitext(file)
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if ext != ".h":
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continue
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src_file = os.path.normpath(os.path.join(root, file))
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rel_path = src_file[src_dir_len:]
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# Check to see if there is a modified header to use instead.
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if os.path.exists(os.path.join(mod_src_dir, rel_path)):
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src_file = os.path.join(mod_src_dir, rel_path)
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src_str = os.path.join("<modified>", src_rel_dir, rel_path)
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else:
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src_str = os.path.join("<original>", src_rel_dir, rel_path)
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dst_file = os.path.join(update_dir, rel_path)
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new_data = clean_header.cleanupFile(dst_file, src_file, rel_path)
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if not new_data:
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continue
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updater.readFile(dst_file)
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ret_val = updater.editFile(dst_file, new_data)
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if ret_val == 0:
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state = "unchanged"
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elif ret_val == 1:
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state = "edited"
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else:
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state = "added"
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update_path = os.path.join(update_rel_dir, rel_path)
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print("cleaning %s -> %s (%s)" % (src_str, update_path, state))
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# This lets us support regular system calls like __NR_write and also weird
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# ones like __ARM_NR_cacheflush, where the NR doesn't come at the start.
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def make__NR_name(name):
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if name.startswith('__ARM_NR_'):
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return name
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else:
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return '__NR_%s' % (name)
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# Scan Linux kernel asm/unistd.h files containing __NR_* constants
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# and write out equivalent SYS_* constants for glibc source compatibility.
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def GenerateGlibcSyscallsHeader(updater):
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libc_root = '%s/bionic/libc/' % os.environ['ANDROID_BUILD_TOP']
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# Collect the set of all syscalls for all architectures.
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syscalls = set()
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pattern = re.compile(r'^\s*#\s*define\s*__NR_([a-z_]\S+)')
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for unistd_h in ['kernel/uapi/asm-generic/unistd.h',
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'kernel/uapi/asm-arm/asm/unistd.h',
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'kernel/uapi/asm-arm/asm/unistd-common.h',
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'kernel/uapi/asm-arm/asm/unistd-eabi.h',
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'kernel/uapi/asm-arm/asm/unistd-oabi.h',
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'kernel/uapi/asm-x86/asm/unistd_32.h',
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'kernel/uapi/asm-x86/asm/unistd_64.h',
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'kernel/uapi/asm-x86/asm/unistd_x32.h']:
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for line in open(os.path.join(libc_root, unistd_h)):
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m = re.search(pattern, line)
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if m:
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nr_name = m.group(1)
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if 'reserved' not in nr_name and 'unused' not in nr_name:
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syscalls.add(nr_name)
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# Create a single file listing them all.
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# Note that the input files include #if trickery, so even for a single
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# architecture we don't know exactly which ones are available.
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# https://b.corp.google.com/issues/37110151
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content = '/* Generated file. Do not edit. */\n'
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content += '#pragma once\n'
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for syscall in sorted(syscalls):
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nr_name = make__NR_name(syscall)
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content += '#if defined(%s)\n' % nr_name
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content += ' #define SYS_%s %s\n' % (syscall, nr_name)
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content += '#endif\n'
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syscall_file = os.path.join(libc_root, 'include/bits/glibc-syscalls.h')
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updater.readFile(syscall_file)
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updater.editFile(syscall_file, content)
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try:
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optlist, args = getopt.getopt(sys.argv[1:], '')
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except:
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# Unrecognized option
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sys.stderr.write("error: unrecognized option\n")
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Usage()
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if len(optlist) > 0 or len(args) > 2:
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Usage()
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if len(args) > 0:
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original_dir = args[0]
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else:
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original_dir = get_kernel_headers_original_dir()
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if len(args) > 1:
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modified_dir = args[1]
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else:
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modified_dir = get_kernel_headers_modified_dir()
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if not os.path.isdir(original_dir):
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panic("The kernel directory %s is not a directory\n" % original_dir)
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if not os.path.isdir(modified_dir):
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panic("The kernel modified directory %s is not a directory\n" % modified_dir)
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updater = BatchFileUpdater()
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# Process the original uapi headers first.
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ProcessFiles(updater, original_dir, modified_dir, "uapi", "uapi"),
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# Now process the special files.
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ProcessFiles(updater, original_dir, modified_dir, "scsi", os.path.join("android", "scsi", "scsi"))
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# Copy all of the files.
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updater.updateFiles()
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# Now re-generate the <bits/glibc-syscalls.h> from the new uapi headers.
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updater = BatchFileUpdater()
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GenerateGlibcSyscallsHeader(updater)
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updater.updateFiles()
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