Commit Graph

95 Commits

Author SHA1 Message Date
Szabolcs Nagy
f7d348ec39 add O_TMPFILE flag, new in linux 3.11
definition in linux:
 #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
where __O_TMPFILE and O_DIRECTORY are arch specific
2013-11-23 23:47:48 +00:00
Rich Felker
326e5c2e27 fix the nominal type of LDBL_* limits on archs with ld64
previously these macros wrongly had type double rather than long
double. I see no way an application could detect the error in C99, but
C11's _Generic can trivially detect it.

at the same time, even though these archs do not have excess
precision, the number of decimal places used to represent these
constants has been increased to 21 to be consistent with the decimal
representations used for the DBL_* macros.
2013-11-20 18:28:18 -05:00
Szabolcs Nagy
b20760c023 support configurable page size on mips, powerpc and microblaze
PAGE_SIZE was hardcoded to 4096, which is historically what most
systems use, but on several archs it is a kernel config parameter,
user space can only know it at execution time from the aux vector.

PAGE_SIZE and PAGESIZE are not defined on archs where page size is
a runtime parameter, applications should use sysconf(_SC_PAGE_SIZE)
to query it. Internally libc code defines PAGE_SIZE to libc.page_size,
which is set to aux[AT_PAGESZ] in __init_libc and early in __dynlink
as well. (Note that libc.page_size can be accessed without GOT, ie.
before relocations are done)

Some fpathconf settings are hardcoded to 4096, these should be actually
queried from the filesystem using statfs.
2013-09-15 02:00:32 +00:00
Rich Felker
7568ee4cbf add missing a_or_l to atomic.h for non-x86 archs
this is needed for recently committed sigaction code
2013-08-11 03:43:25 -04:00
Rich Felker
c5e34dabbb new mostly-C crt1 implementation
the only immediate effect of this commit is enabling PIE support on
some archs that did not previously have any Scrt1.s, since the
existing asm files for crt1 override this C code. so some of the
crt_arch.h files committed are only there for the sake of documenting
what their archs "would do" if they used the new C-based crt1.

the expectation is that new archs should use this new system rather
than using heavy asm for crt1. aside from being easier and less
error-prone, it also ensures that PIE support is available immediately
(since Scrt1.o is generated from the same C source, using -fPIC)
rather than having to be added as an afterthought in the porting
process.
2013-07-26 01:49:14 -04:00
Rich Felker
9693501c15 change jmp_buf to share an underlying type and struct tag with sigjmp_buf
this is necessary to meet the C++ ABI target. alternatives were
considered to avoid the size increase for non-sig jmp_buf objects, but
they seemed to have worse properties. moreover, the relative size
increase is only extreme on x86[_64]; one way of interpreting this is
that, if the size increase from this patch makes jmp_buf use too much
memory, then the program was already using too much memory when built
for non-x86 archs.
2013-07-24 02:17:02 -04:00
Rich Felker
3f08154ac4 remove SIG_ATOMIC_MIN/MAX from stdint bits headers
i386 was done with the big commit but I missed the others
2013-07-22 17:02:03 -04:00
Rich Felker
1c6cace0bf fix regression in size of nlink_t (broken stat struct) on x86_64
rather than moving nlink_t back to the arch-specific file, I've added
a macro _Reg defined to the canonical type for register-size values on
the arch. this is not the same as _Addr for (not-yet-supported)
32-on-64 pseudo-archs like x32 and mips n32, so a new macro was
needed.
2013-07-22 15:45:28 -04:00
Rich Felker
c4dd0c98ba change wint_t to unsigned
aside from the obvious C++ ABI purpose for this change, it also brings
musl into alignment with the compiler's idea of the definition of
wint_t (use in -Wformat), and makes the situation less awkward on ARM,
where wchar_t is unsigned.

internal code using wint_t and WEOF was checked against this change,
and while a few cases of storing WEOF into wchar_t were found, they
all seem to operate properly with the natural conversion from unsigned
to signed.
2013-07-22 13:05:41 -04:00
Rich Felker
9448b0513e refactor headers, especially alltypes.h, and improve C++ ABI compat
the arch-specific bits/alltypes.h.sh has been replaced with a generic
alltypes.h.in and minimal arch-specific bits/alltypes.h.in.

this commit is intended to have no functional changes except:
- exposing additional symbols that POSIX allows but does not require
- changing the C++ name mangling for some types
- fixing the signedness of blksize_t on powerpc (POSIX requires signed)
- fixing the limit macros for sig_atomic_t on x86_64
- making dev_t an unsigned type (ABI matching goal, and more logical)

in addition, some types that were wrongly defined with long on 32-bit
archs were changed to int, and vice versa; this change is
non-functional except for the possibility of making pointer types
mismatch, and only affects programs that were using them incorrectly,
and only at build-time, not runtime.

the following changes were made in the interest of moving
non-arch-specific types out of the alltypes system and into the
headers they're associated with, and also will tend to improve
application compatibility:
- netdb.h now includes netinet/in.h (for socklen_t and uint32_t)
- netinet/in.h now includes sys/socket.h and inttypes.h
- sys/resource.h now includes sys/time.h (for struct timeval)
- sys/wait.h now includes signal.h (for siginfo_t)
- langinfo.h now includes nl_types.h (for nl_item)

for the types in stdint.h:
- types which are of no interest to other headers were moved out of
  the alltypes system.
- fast types for 8- and 64-bit are hard-coded (at least for now); only
  the 16- and 32-bit ones have reason to vary by arch.

and the following types have been changed for C++ ABI purposes;
- mbstate_t now has a struct tag, __mbstate_t
- FILE's struct tag has been changed to _IO_FILE
- DIR's struct tag has been changed to __dirstream
- locale_t's struct tag has been changed to __locale_struct
- pthread_t is defined as unsigned long in C++ mode only
- fpos_t now has a struct tag, _G_fpos64_t
- fsid_t's struct tag has been changed to __fsid_t
- idtype_t has been made an enum type (also required by POSIX)
- nl_catd has been changed from long to void *
- siginfo_t's struct tag has been removed
- sigset_t's has been given a struct tag, __sigset_t
- stack_t has been given a struct tag, sigaltstack
- suseconds_t has been changed to long on 32-bit archs
- [u]intptr_t have been changed from long to int rank on 32-bit archs
- dev_t has been made unsigned

summary of tests that have been performed against these changes:
- nsz's libc-test (diff -u before and after)
- C++ ABI check symbol dump (diff -u before, after, glibc)
- grepped for __NEED, made sure types needed are still in alltypes
- built gcc 3.4.6
2013-07-22 11:22:36 -04:00
Rich Felker
648c3b4e18 change uid_t, gid_t, and id_t to unsigned types
this change is both to fix one of the remaining type (and thus C++
ABI) mismatches with glibc/LSB and to allow use of the full range of
uid and gid values, if so desired.

passwd/group access functions were not prepared to deal with unsigned
values, so they too have been fixed with this commit.
2013-07-19 01:34:28 -04:00
Rich Felker
f389c4984a make the dynamic linker find its path file relative to its own location
prior to this change, using a non-default syslibdir was impractical on
systems where the ordinary library paths contain musl-incompatible
library files. the file containing search paths was always taken from
/etc, which would either correspond to a system-wide musl
installation, or fail to exist at all, resulting in searching of the
default library path.

the new search strategy is safe even for suid programs because the
pathname used comes from the PT_INTERP header of the program being
run, rather than any external input.

as part of this change, I have also begun differentiating the names of
arch variants that differ by endianness or floating point calling
convention. the corresponding changes in the build system and and gcc
wrapper script (to use an alternate dynamic linker name) for these
configurations have not yet been made.
2013-07-18 19:29:44 -04:00
Rich Felker
a3e2f3c2b1 respect iso c namespace in stdio.h and wchar.h regarding va_list
despite declaring functions that take arguments of type va_list, these
headers are not permitted by the c standard to expose the definition
of va_list, so an alias for the type must be used. the name
__isoc_va_list was chosen to convey that the purpose of this alternate
name is for iso c conformance, and to avoid the multitude of names
which gcc mangles with its hideous "fixincludes" monstrosity, leading
to serious header breakage if these "fixes" are run.
2013-06-25 22:26:20 -04:00
Rich Felker
d926565355 Merge remote-tracking branch 'nsz/review' 2013-05-26 18:22:12 -04:00
Szabolcs Nagy
41c34d188a fix ioctl _IOR, _IOW, etc macros to avoid signed overflow (2<<30) 2013-05-26 15:49:08 +00:00
Rich Felker
5e642b5a23 change underlying type of clock_t to be uniform and match ABI
previously we were using an unsigned type on 32-bit systems so that
subtraction would be well-defined when it wrapped, but since wrapping
is non-conforming anyway (when clock() overflows, it has to return -1)
the only use of unsigned would be to buy a little bit more time before
overflow. this does not seem worth having the type vary per-arch
(which leads to more arch-specific bugs) or disagree with the ABI musl
(mostly) follows.
2013-05-23 20:38:51 -04:00
Rich Felker
22730d6560 add FLT_TRUE_MIN, etc. macros from C11
there was some question as to how many decimal places to use, since
one decimal place is always sufficient to identify the smallest
denormal uniquely. for now, I'm following the example in the C
standard which is consistent with the other min/max macros we already
had in place.
2013-05-17 18:38:42 -04:00
Rich Felker
f77bab5933 fix type issues in stdint.h so underlying types of 64-bit types match ABI 2013-04-04 20:09:50 -04:00
Rich Felker
c7af271000 eliminate bits/wchar.h
the preprocessor can reliably determine the signedness of wchar_t.
L'\0' is used for 0 in the expressions so that, if the underlying type
of wchar_t is long rather than int, the promoted type of the
expression will match the type of wchar_t.
2013-04-04 19:57:23 -04:00
rofl0r
47cf4919fc re-add useconds_t
this type was removed back in 5243e5f160 ,
because it was removed from the XSI specs.
however some apps use it.
since it's in the POSIX reserved namespace, we can expose it
unconditionally.
2013-04-02 04:58:14 +02:00
Szabolcs Nagy
8d3ee05754 add syscall numbers for the new kcmp and finit_module syscalls
and remove syscall todos from microblaze
2013-04-01 18:02:32 +00:00
Rich Felker
ccc7b4c3a1 remove __SYSCALL_SSLEN arch macro in favor of using public _NSIG
the issue at hand is that many syscalls require as an argument the
kernel-ABI size of sigset_t, intended to allow the kernel to switch to
a larger sigset_t in the future. previously, each arch was defining
this size in syscall_arch.h, which was redundant with the definition
of _NSIG in bits/signal.h. as it's used in some not-quite-portable
application code as well, _NSIG is much more likely to be recognized
and understood immediately by someone reading the code, and it's also
shorter and less cluttered.

note that _NSIG is actually 65/129, not 64/128, but the division takes
care of throwing away the off-by-one part.
2013-03-26 23:07:31 -04:00
Rich Felker
2d0f495e7b add deprecated SIGIOT alias for SIGABRT
reportedly some programs (e.g. showkeys in the kbd package) use it.
2013-03-23 20:02:31 -04:00
Rich Felker
da1442c9a8 fix types for wctype_t and wctrans_t
wctype_t was incorrectly "int" rather than "long" on x86_64. not only
is this an ABI incompatibility; it's also a major design flaw if we
ever wanted wctype_t to be implemented as a pointer, which would be
necessary if locales support custom character classes, since int is
too small to store a converted pointer. this commit fixes wctype_t to
be unsigned long on all archs, matching the LSB ABI; this change does
not matter for C code, but for C++ it affects mangling.

the same issue applied to wctrans_t. glibc/LSB defines this type as
const __int32_t *, but since no such definition is visible, I've just
expanded the definition, int, everywhere.

it would be nice if these types (which don't vary by arch) could be in
wctype.h, but the OB XSI requirement in POSIX that wchar.h expose some
types and functions from wctype.h precludes doing so. glibc works
around this with some hideous hacks, but trying to duplicate that
would go against the intent of musl's headers.
2013-03-04 19:22:14 -05:00
Szabolcs Nagy
000806cde6 add missing mmap options and madvices to bits/mman.h based on linux headers 2013-01-12 19:42:39 +01:00
Szabolcs Nagy
bc1a8d2ae3 add missing EXTPROC flag to bits/termios.h
mips and powerpc already had this termios flag defined
2013-01-12 19:42:39 +01:00
Szabolcs Nagy
73bb048951 add missing F_GETOWNER_UIDS flag to bits/fcntl.h 2013-01-12 19:42:39 +01:00
Szabolcs Nagy
056c8b1ab5 add missing EHWPOISON to bits/errno.h
it was already defined for mips, but was missing from other archs
2013-01-12 19:42:39 +01:00
rofl0r
7e0d4fce41 add more arch-specific MAP_ macros to bits/mman.h
these are also needed by qemu.
2012-12-06 16:57:22 +01:00
rofl0r
db846a6217 remove MAP_32 from non-x86 archs
both kernel and glibc define it only on x86(_64).
2012-12-06 01:26:51 +01:00
rofl0r
0e10f74006 add MAP_NORESERVE to bits/mman.h
this is needed for qemu, and since it differs for each arch
it can't be circumvented easily by using a macro in CFLAGS.
2012-12-06 01:26:51 +01:00
Rich Felker
a8da6c2f28 fixup mcontext stuff to expost gregset_t/fpregset_t as appropriate 2012-11-25 23:04:23 -05:00
Rich Felker
132cc703f8 remove microblaze user.h incorrectly copied from arm 2012-11-25 21:12:34 -05:00
Rich Felker
c72fc23843 sigcontext/mcontext cleanup for arch-specific bits
with these changes, the members/types of mcontext_t and related stuff
should closely match the glibc definitions. unlike glibc, however, the
definitions here avoid using typedefs as much as possible and work
directly with the underlying types, to minimize namespace pollution
from signal.h in the default (_BSD_SOURCE) profile.

this is a first step in improving compatibility with applications
which poke at context/register information -- mainly debuggers, trace
utilities, etc. additional definitions in ucontext.h and other headers
may be needed later.

if feature test macros are used to request a conforming namespace,
mcontext_t is replaced with an opaque structure of the equivalent size
and alignment; conforming programs cannot examine its contents anyway.
2012-11-23 14:35:25 -05:00
Rich Felker
7538708f8b fix up leftover, incorrect NSIG definitions in arch-specific signal.h 2012-11-23 12:20:53 -05:00
Rich Felker
65b98213e4 add back NSIG, removed from powerpc in last commit, but for all archs
unlike the previous definition, NSIG/_NSIG is supposed to be one more
than the highest signal number. adding this will allow simplifying
libc-internal code that makes signal-related syscalls, which can be
done as a later step. some apps might use it too; while this usage is
questionable, it's at least not insane.
2012-11-21 13:41:58 -05:00
Rich Felker
0004ea613a fix breakage from introducing bits header for sys/io.h
apparently some other archs have sys/io.h and should not break just
because they don't have the x86 port io functions. provide a blank
bits/io.h everywhere for now.
2012-11-18 19:58:15 -05:00
rofl0r
8d2887f884 fcntl.h: O_SEARCH was missing for powerpc
put some macros that do not differ between architectures in the
main header and remove from bits.
restructure mips header so it has the same structure as the others.
2012-11-18 05:14:40 +01:00
Rich Felker
dde325d7b3 fix struct stat size/padding on microblaze 2012-10-19 18:52:14 -04:00
Rich Felker
25011215be inline syscalls for microblaze 2012-10-18 22:13:36 -04:00
Rich Felker
64251d8bbd better support for reverse-endian variants of arm/mips/microblaze
these macros are supported by more compilers
2012-10-18 21:50:55 -04:00
Rich Felker
21284ec75d microblaze TLS relocation support, completely untested 2012-10-15 21:01:48 -04:00
Rich Felker
9ec4283b28 add support for TLS variant I, presently needed for arm and mips
despite documentation that makes it sound a lot different, the only
ABI-constraint difference between TLS variants II and I seems to be
that variant II stores the initial TLS segment immediately below the
thread pointer (i.e. the thread pointer points to the end of it) and
variant I stores the initial TLS segment above the thread pointer,
requiring the thread descriptor to be stored below. the actual value
stored in the thread pointer register also tends to have per-arch
random offsets applied to it for silly micro-optimization purposes.

with these changes applied, TLS should be basically working on all
supported archs except microblaze. I'm still working on getting the
necessary information and a working toolchain that can build TLS
binaries for microblaze, but in theory, static-linked programs with
TLS and dynamic-linked programs where only the main executable uses
TLS should already work on microblaze.

alignment constraints have not yet been heavily tested, so it's
possible that this code does not always align TLS segments correctly
on archs that need TLS variant I.
2012-10-15 18:51:53 -04:00
Rich Felker
9c74856af7 dynamic-linked TLS support for everything but dlopen'd libs
currently, only i386 is tested. x86_64 and arm should probably work.
the necessary relocation types for mips and microblaze have not been
added because I don't understand how they're supposed to work, and I'm
not even sure if it's defined yet on microblaze. I may be able to
reverse engineer the requirements out of gcc/binutils output.
2012-10-04 22:48:33 -04:00
Rich Felker
8c0a3d9e5c microblaze port
based on initial work by rdp, with heavy modifications. some features
including threads are untested because qemu app-level emulation seems
to be broken and I do not have a proper system image for testing.
2012-09-29 01:05:31 -04:00