<bits/glibc-syscalls.h>: only regenerate when we have new uapi headers.
Test: update_all.py
Change-Id: Iaa92dce263197f5a0e7d2dce5e00a31372dcb3e9
diff --git a/libc/kernel/tools/update_all.py b/libc/kernel/tools/update_all.py
index 0f30ecd..9d5b02d 100755
--- a/libc/kernel/tools/update_all.py
+++ b/libc/kernel/tools/update_all.py
@@ -4,7 +4,7 @@
from defaults import *
from utils import *
-def usage():
+def Usage():
print """\
usage: %(progname)s [kernel-original-path] [kernel-modified-path]
@@ -24,7 +24,7 @@
""" % { "progname" : os.path.basename(sys.argv[0]) }
sys.exit(0)
-def processFiles(updater, original_dir, modified_dir, src_rel_dir, update_rel_dir):
+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)
shutil.rmtree(update_dir)
@@ -64,15 +64,64 @@
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-common.h',
+ 'kernel/uapi/asm-arm/asm/unistd-eabi.h',
+ 'kernel/uapi/asm-arm/asm/unistd-oabi.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'
+
+ updater.editFile('%s/include/bits/glibc-syscalls.h' % libc_root, content)
+
+
try:
optlist, args = getopt.getopt(sys.argv[1:], '')
except:
# Unrecognized option
sys.stderr.write("error: unrecognized option\n")
- usage()
+ Usage()
if len(optlist) > 0 or len(args) > 2:
- usage()
+ Usage()
if len(args) > 0:
original_dir = args[0]
@@ -91,10 +140,16 @@
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"),
+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"))
+ProcessFiles(updater, original_dir, modified_dir, "scsi", os.path.join("android", "scsi", "scsi"))
updater.updateGitFiles()
+
+# Now re-generate the <bits/glibc-syscalls.h> from the new uapi headers.
+updater = BatchFileUpdater()
+GenerateGlibcSyscallsHeader(updater)
+updater.updateGitFiles()