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Implement _start: compute parameters for __self_reloc, and give
control to the user program.
* ldso/ldso/arm/dl-startup.h: Implement _start for __FDPIC__.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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* ldso/ldso/ldso.c (_start): Fix definition for __FDPIC__.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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Add FDPIC dynamic relocations support, similar to what other FDPIC
targets do.
Lazy binding is implemented in a folllow-up patch.
Disable the SEND* macros because they involve relocations to
access constant strings that are unsupported by the existing
arm version.
Define DL_START, START, ARCH_NEEDS_BOOTSTRAP_RELOCS,
DL_CHECK_LIB_TYPE similarly to what other FDPIC targets do.
Define raise() because _dl_find_hash references __aeabi_uidivmod,
which uses __aeabi_idiv0 which in turn references raise.
* include/elf.h (R_ARM_FUNCDESC): Define.
(R_ARM_FUNCDESC_VALUE): Define.
* ldso/include/dl-string.h (SEND_STDERR, SEND_ADDRESS_STDERR)
(SEND_NUMBER_STDERR): Define empty for __FDPIC__.
* ldso/ldso/arm/dl-inlines.h: New file.
* ldso/ldso/arm/dl-startup.h (PERFORM_BOOTSTRAP_RELOC): Fix type
of load_addr. Fix handling of R_ARM_RELATIVE, add support for
R_ARM_FUNCDESC_VALUE.
(DL_START, START): Define for __FDPIC__.
(raise): Define.
* ldso/ldso/arm/dl-sysdep.h (ARCH_NEEDS_BOOTSTRAP_RELOCS): Define.
(DL_CHECK_LIB_TYPE): Define.
(elf_machine_type_class): Take into account FDPIC related
relocations.
(elf_machine_load_address): Support __FDPIC__.
(elf_machine_relative): Likewise.
* ldso/ldso/arm/elfinterp.c (_dl_linux_resolver): Dummy support
for __FDPIC__, implemented in a later patch.
(_dl_do_reloc): Fix reloc_adr computation for __FDPIC__, fix
handling of local symbols. Fix handling of R_ARM_RELATIVE, add
support for R_ARM_FUNCDESC_VALUE, R_ARM_FUNCDESC.
* ldso/ldso/arm/resolve.S: Make _dl_linux_resolve hidden.
* ldso/ldso/fdpic/dl-inlines.h (htab_delete): Declare.
* libc/sysdeps/linux/arm/bits/elf-fdpic.h: New file, similar to bfin's.
* libc/sysdeps/linux/arm/crtreloc.c: Likewise.
* libc/sysdeps/linux/arm/find_exidx.c (__dl_addr_in_loadaddr) Define.
(find_exidx_callback): Support __FDPIC__.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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Like for other FDPIC targets, add defined(__FDPIC__) where needed.
* include/link.h: Include bits/elf-fdpic.h if __FDPIC__ is defined.
(link_map): Use elf32_fdpic_loadaddr if __FDPIC__ is defined.
(dl_phdr_info): Likewise.
* ldso/include/dl-elf.h (__dl_parse_dynamic_info): Support
__FDPIC__.
* ldso/include/dl-hash.h (elf_resolve): Add funcdesc_ht field if
__FDPIC__ is defined.
* ldso/ldso/dl-hash.c (_dl_find_hash): Support __FDPIC__.
* libc/misc/elf/dl-iterate-phdr.c (dl_iterate_phdr): Support __FDPIC__.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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Without MMU, we cannot mark memory regions as read-only.
* ldso/ldso/dl-elf.c (_dl_protect_relro): Do nothing if
__ARCH_USE_MMU__ is defined.
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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These assembler functions seem to be unused/referenced, so we can remove
them completely.
Signed-off-by: Florian La Roche <Florian.LaRoche@googlemail.com>
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Fix problem which might exist since 2011. We need to execute
the destructors for all dependant libraries, before munmap the
shared libraries, otherwise running destructor of a dependent library
might cause a segfault, trying to access an already unmapped memory.
This fixes for example segfaults while running php -m with ldap
module.
Reported-By: Dave Flogeras <dflogeras2@gmail.com>
Tested-By: Dave Flogeras <dflogeras2@gmail.com>
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Revert 35105679b9a900d58dadd0852e679c235f8176ba and add some debug
code.
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The munmap was still called with broken length, as sometimes
start was empty. This finally solves segfaults when running
php -m with ldap module activated.
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This reverts commit bf4c2d242f587700e3eb2ffd5721ddaf3cdbc7e5.
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There is a patch included in https://bugs.busybox.net/show_bug.cgi?id=6158
from 2013, which was never applied.
This really fixes the php -m segfaults.
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This reverts commit 952bb00f0b2eb576b0bf48c4f87018429a42e28d.
And adds this fix for 64 Bit systems.
http://lists.busybox.net/pipermail/uclibc/2014-December/048737.html
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Sync with GNU C library and consolidate duplicate non
architecture specific defines.
MAP_UNINITIALIZED is only defined to 0x4000000 and used by
the Linux kernel when CONFIG_MMAP_ALLOW_UNINITIALIZED is enabled.
CONFIG_MMAP_ALLOW_UNINITIALIZED is only available for nommu.
See Documentation/nommu-mmap.txt.
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R_XTENSA_TLSDESC_ARG is a true RELA relocation, the addend is in the
relocation record itself, not in place.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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There are multiple errors in _dl_tlsdesc_dynamic:
- the reference C implementation should return pointer to the
thread-local variable, not offset from the thread pointer, because the
xtensa ABI expects TLSDESC_FN to return pointer to the TLS variable;
- addx8 used for indexing into dtv has its second and third registers in
wrong order, the index must be multiplied by 8, not the base;
- the same addx8 uses wrong base: instead of dtv it adds the offset to
the threadptr;
- the return value in the fast path is calculated as
td->tlsinfo.ti_offset - __builtin_thread_pointer, not what was
intended;
- both fast and slow paths should not subtract __builtin_thread_pointer
from the result.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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Sync with GNU C library commit:
commit a68ba2f3cd3cbe32c1f31e13c20ed13487727b32
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed Oct 18 17:26:23 2017 +0100
Fixes issues with binutils version > 2.29.1.
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Port over NPTL/TLS support from GNU C Library.
In the first step only the slower syscall is used for TLS
access. The uClibc-ng testsuite shows 79 errors, so their
is room for bugfixes and improvements.
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Signed-off-by: Guo Ren <ren_guo@c-sky.com>
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Follow the steps to build c-sky uclibc linux system:
1. git clone https://github.com/c-sky/buildroot.git
2. cd buildroot
3. make qemu_csky_ck810_uclibc_defconfig
4. make
Follow the buildroot/board/qemu/csky/readme.txt to run.
This buildroot toolchain is pre-build, But you can rebuild
the c-sky uclibc-ng alone and install it to the buildroot
sysroot manually.
We'll try our best to improve the uclibc-ng continuously.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
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Signed-off-by: Alex Potapenko <opotapenko@gmail.com>
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
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Latest binutils 2.29 release emits a R_MICROBLAZE_NONE
relocation, which breaks shared library loader bootstrap
relocation.
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This reverts commit 9b42da7d0558884e2a3cc9a8674ccfc752369610.
This fixes a long standing bug in dlclose().
Can be seen with apache and mod_php or just by executing
php -m to list all modules.
Reported-by: Bernd Kuhls <bernd.kuhls@t-online.de>
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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Binutils emits by default lazy relocations for TLSDESC and
ld.so need to handle that. Fixes problems like:
can't handle reloc type 0x407
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Inner loop was using same counter variable (i) as the outer loop, therefore
making outer loop terminate before it visited all of the ELF program segments.
Surrounding code in this inner loop clearly shows the intention that this loop
should not affect the outer one, therefore leading me to the conclusion that
this should be a bug an not expected code.
This bug was detected due to some other bug in ARC binutils that kept setting
TEXTREL for any PIE application.
Apart from the but, I have also moved the debug message inside of the TEXTREL
condition as mprotect is only really called if TELTREL is set.
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_dl_zalloc callers don't check for allocaton failure. It kind of makes
sense since such early allocations are unlikely to fail, and even if
they do, ldso would segv anyways thus bringing the issue to attention.
However there's a gcc nuance which led to this patch.
It seems gcc at -O2 (for DODEBUG build), does additional coge gen
analysis for pointer dereference from erroneous paths and it "isolates"
such code paths with a intrinsic abort/trap etc.
The ldso code fragment which was triggering this:
| add_ldso(struct dyn_elf *rpnt)
| if (rpnt)
| ...
| else
| rpnt = _dl_zalloc()
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| rpnt->dyn = tpnt <---- potential NULL pointer deref
ARC gcc currently generates an abort() call which doesn't exist in ldso,
causing link errors (with a newer vrsion of binutils).
ARM gcc 6.2.1 behaves similarly, altough instead of abort, it generates
a trap inducing UDF instruction
| 367c: ebfffb79 bl 2468 <_dl_malloc>
| 3680: e51b2068 ldr r2, [fp, #-104] ; 0xffffff98
| 3684: e3500000 cmp r0, #0
| 3688: 0a000006 beq 36a8 <_dl_add_elf_hash_table+0x280>
| ...
| 36a8: e5862000 str r2, [r6]
| 36ac: e7f000f0 udf #
So add an explict dl_exit() in dl_zalloc error case to beat the
compiler.
Note that this error propagagtion analysis stops if the function in
consideration (_dl_zalloc) is NOT inlined. Hence the reason it only
shows up for DODEBUG builds which builds ldso at -O2 which is more
aggressive about inlining.
If this patch is not considered worth applying then the workaround
suggested by Claudiu is to to build ldso with
-fno-isolate-erroneous-paths-dereference
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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the --discard-* toggles take away the symbols which comes in the way
when staring at objdumps for debugging low level issues
So don't discard symbols for DODEBUG builds
before
-----
3388: j_s.d [blink]
338a: add_s sp,sp,0x18
338c: b.d 332c <_dl_add_elf_hash_table+0x50>
3390: mov_s r2,0
3392: nop_s
3394: push_s blink <--- function not called out
3396: st.aw r13,[sp,-20]
339a: std r14r15,[sp,4]
339e: std r16r17,[sp,12]
after
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3388: j_s.d [blink]
338a: add_s sp,sp,0x18
338c: b.d 332c <_dl_add_elf_hash_table+0x50>
3390: mov_s r2,0
3392: nop_s
00003394 <add_ldso.isra.9>:
3394: push_s blink
3396: st.aw r13,[sp,-20]
339a: std r14r15,[sp,4]
339e: std r16r17,[sp,12]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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... before falling back to ld.so installation path (it is not the same -
gcc uses /lib/ld-uClibc-x86-64.so.0 for uClibc) or default /lib:/usr/lib.
This matches glibc behavior (see trusted-dirs.h generated during glibc
build).
Signed-off-by: Alexey Neyman <stilor@att.net>
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Ported over from GNU C Library and runtime tested in Qemu.
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implementation
Signed-off-by: mirabilos <m@mirbsd.org>
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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This commit includes following features.
1. Support NPTL/TLS
2. Add libm function which is used to handle FP rounding and excpetions
(ex: fclrexcpt,fedisblxcpti,feenablxcpt... )
3. Add *context function for operating user context
(ex: setcontext,getcontext,makecontext... )
4. Change the return flow from signal handler
5. Cleanup of old code
The testsuite only has 2 errors, tst-cpuclock1 and tst-cputimer1,
which are related to timing accuracy. (math and locale tests are disabled)
Signed-off-by: Vincent Ren-Wei Chen <vincentc@andestech.com>
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This removes _DYNAMIC@gotpc from elf_machine_load_address()
This is a seperate commit to callout the fact that old code was actually
broken but was NOT caught since it never gets called (and will never be)
since ld.so only calls it if kernel doesn't pass AT_BASE auxvt, which is
not true for Linux.
if (!auxvt[AT_BASE].a_un.a_val)
auxvt[AT_BASE].a_un.a_val = elf_machine_load_address();
So while the intent was to remove _DYNAMIC@gotpc construct, we need to
come up with something which works.
The build time address computation of .dynamic which works well is:
- "ld %1, [pcl, _DYNAMIC@gotpc] \n"
+ "ld %1, [pcl, _GLOBAL_OFFSET_TABLE_@pcl] \n"
However the runtime address of .dynamic can only be generated with
"add %0, pcl, _DYNAMIC@pcl \n"
which unfortunately is what is currently broken as it is converted to
i_GLOBAL_OFFSET_TABLE_t and thus refers to runtime address of .got and
not .dyanmic
Thus we resort to using an arbit symbol _dl_start at the expense of an
extra GOT entry and a bogus R_ARC_NONE relo in ldso itself which now
needs to be ignored.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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This converts elf_machine_dynamic() to not use the _DYNAMIC@xx construct
which was historically converted by assembler into _GLOBAL_OFFSET_TABLE
Now that "hack" is being removed from assembler, we need to make sure
that no code relies on that magic "conversion".
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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Signed-off-by: Matthew Fortune <Matthew.Fortune@imgtec.com>
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Fixes following problem, when trying to compile a simple
C application statically with a FDPIC toolchain (for example
with Blackfin architecture):
lib/libc.a(libdl.os): In function `do_dlclose':
(.text+0x6be): undefined reference to `_dl_free'
..
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Only static linking is supported for now.
More debugging and analyzing for ld.so, TLS and NPTL
is required. But at least you can bootup a static
root fileystem in Qemu.
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