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