Jurij Smakov schrieb:
Hi,
I've done further investigation since it's still failing. A detailed
trace I've obtained from a SIGBUS during lua-zip build:
Core was generated by `lua5.1 -l zip tests/test_zip.lua'.
Program terminated with signal 10, Bus error.
#0 0x7008293c in __zzip_parse_root_directory (fd=3,
trailer=0xffd66d58, hdr_return=0x47dc0, io=0x70098020) at
../../zzip/zip.c:440
440 hdr->d_crc32 = zzip_disk_entry_get_crc32 (d);
(gdb) bt full
#0 0x7008293c in __zzip_parse_root_directory (fd=3,
trailer=0xffd66d58, hdr_return=0x47dc0, io=0x70098020) at
../../zzip/zip.c:440
__bsx = 4292242562
d = (struct zzip_disk_entry *) 0xffd66c82
u_extras = 0
u_comment = 0
u_namlen = 6
dirent = {z_magic = "PK\001\002", z_encoder = {version =
"\024", ostype = ""}, z_extract = {version = "\024", ostype = ""},
z_flags = "\000", z_compr = "\b", z_dostime = {
time = ")£", date = "Ù0"}, z_crc32 = "㦢O", z_csize =
"|\000\000", z_usize = "\237\000\000", z_namlen = "\006", z_extras =
"\000", z_comment = "\000", z_diskstart = "\000",
z_filetype = "\001", z_filemode = " \000\000", z_offset =
"\000\000\000"}
hdr = (struct zzip_dir_hdr *) 0x47ec0
hdr0 = (struct zzip_dir_hdr *) 0x47ec0
p_reclen = (uint16_t *) 0x0
entries = 4
zz_offset = 0
fd_map = 0x70074000
zz_fd_gap = 4826
zz_entries = 4
zz_rootsize = 214
zz_rootseek = 4826
#1 0x70083238 in __zzip_dir_parse (dir=0x47da8) at
../../zzip/zip.c:661
rv = ZZIP_NO_ERROR
filesize = 5062
trailer = {zz_tail = 0x13b0, zz_for_correct_rootseek =
0x703241ac, zz_entries = 4, zz_finalentries = 4, zz_rootseek = 4826,
zz_rootsize = 214}
#2 0x700830b0 in zzip_dir_fdopen_ext_io (fd=3, errcode_p=0x0,
ext=0x70098014, io=0x70098020) at ../../zzip/zip.c:622
rv = 270344
dir = (ZZIP_DIR *) 0x47da8
#3 0x700834ec in zzip_dir_open_ext_io (filename=0x4a400 "luazip.zip",
e=0x0, ext=0x70098014, io=0x70098020) at ../../zzip/zip.c:726
fd = 3
#4 0x7008343c in zzip_dir_open (filename=0x4a400 "luazip.zip", e=0x0)
at ../../zzip/zip.c:708
No locals.
#5 0x700618e0 in ?? ()
No symbol table info available.
#6 0x700618e4 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)
(gdb) print &d->z_crc32
$1 = (zzip_byte_t (*)[4]) 0xffd66c92
Here's the problem: z_crc32 (and all other fields in this structure)
are defined as zzip_byte_t arrays, which means that compiler does not
care about their alignment. When an attempt is made to cast z_crc32
to a 32-bit integer, it gets a SIGBUS, since z_crc32 is only half-word
aligned.
I don't see a way to fix this without a major redesign or making
all the memory-accessing/casting macros in format.h to use memcpy
(ugly).
Best regards,
There is no redesign required - this problem can only occur on non-x86
little-endian platforms.
You did not tell about that detail but I can guess it from the result. In
fetch.h there is
#define zzip_file_header_get_crc32(__p) ZZIP_GET32((__p)->z_crc32)
and that ZZIP_GET32 can be defined in a way that it would fetch each byte seperately. This is already done on a lot of platforms - the definition is dependent on ZZIP_WORDS_BIGENDIAN and covers acrchitectures like SPARC which have aligned word access
as well. However, SPARC is big-endian as have been all the other test platforms in the lab. So, what's your target platform currently? If I am guessing right then would need to redefine the #ifdefs and configure detections in such a way that it would
enable a bytewise access macro on a litte-endian platform right there in fetch.h
cheers, Guido
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