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1) Fix missing error.h in plt.c.
2) Add a TODO to fix missing relplt_count in mips plt.c.
3) Enforce operator precedence between * and != which is apparently incorrect for the mips compiler.
Change-Id: I2d5d925566daf81a0380724bc103570c80e381e7
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Change-Id: I1e80c3ee1693452f8f1669027fcd0a225e986eb2
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- Add Android.mk.
- Work around missing stpcpy() and rindex().
Change-Id: Iffdd707b22a84b1a1c6a802574ded05b289cee0a
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Include stdio.h in files that use fprintf()
Signed-off-by: dann frazier <dannf@debian.org>
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aarch64's fetch.c uses the uintptr_t typedef defined by stdint.h without
including it. This doesn't currently cause a build failure because stdint.h
is indirectly included via proc.h.
Signed-off-by: dann frazier <dannf@debian.org>
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- IFUNC support is not implemented, the rest works well. The only
other failure is in wide char functions, and that occurs on x86_64
as well.
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In prelinked binaries, ltrace has to unprelinks PLT slots in order to
catch calls done through PLT. This makes the calls done through these
slots invalid, because the special first PLT slot is not initialized,
and dynamic linker SIGSEGVs because of this. Ltrace relies on
arranging breakpoints such that the dynamic linker is not actually
entered, and moves PC around itself to simulate the effects of a call
through PLT.
Originally, arch_elf_add_plt_entry was called only for symbols that
were actually traced. Later this was changed and it's now called for
all PLT entries, and the resulting candidate list is filtered
afterwards. This gives backends a chance to rename the symbol, as is
useful with IRELATIVE PLT calls, where symbol name may not be
available at all. But the PPC backend was never updated to reflect
this, and unresolved all symbols for which arch_elf_add_plt_entry was
called, thus rendering _all_ PLT slots invalid, even those that
weren't later procted by breakpoints. Thus calls done through any
untraced slots failed.
This patch fixes this problem by deferring the unprelinking of PLT
slots into the on_install hook of breakpoints.
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GCC 4.4.7 isn't smart enough to realize own_libsym will always be zero
when it sees the goto done which might jump over the initialization of
libsym. And so will produce a warning like:
cc1: warnings being treated as errors
trace.c: In function ‘ifunc_ret_hit’:
trace.c:1433: error: ‘libsym’ may be used uninitialized in this function
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In order to avoid single-stepping through large portions of the
dynamic linker, ltrace remembers at which address the instruction that
resolved a PLT slot is. It then puts a breakpoint to this address so
that it can fast-forward to that address next time it needs to catch a
PLT slot being resolved.
When a process is cloned, the pointer to this breakpoint is simply
copied over to the new process, instead of being looked up in the new
process structures. This patches fixes this.
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This was caught by system_call_params.exp test case:
exe->mount("source", "target", "filesystemtype", 0, nil <unfinished ...>
mount@SYS("", "target", "filesystemtype", 0, nil) = -2
<... mount resumed> = -1
Note how the first parameter disappears--r2 now holds syscall number
(21 in this case), and the original value is stored in orig_gpr2 in
save area.
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- In general they are. But IRELATIVE relocations are sorted to come
last, and PLT entries are not sorted accordingly.
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- This was broken several commits back by removing pltrel from
struct ltelf.
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- That's the customary location for backend hooks.
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- ... from sysdeps/linux-gnu/hooks.c to sysdeps/linux-gnu/trace.c
where it fits better.
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- Just like on PPC64, we need to move IRELATIVE relocations from
.rela.dyn to the vector of PLT relocations
- Just like on PPC64, we may need to rename the symbol--except the
symbol to looked is the one with the address of PLT slot address,
not of rela addend.
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- That means we have to copy them out of ELF ahead of time instead of
referencing them from inside ELF on demand. But this way we can keep
one grand vector of all PLT-like relocations. On PPC, this makes
a difference: some PLT-like relocations (R_PPC64_JMP_IREL in
particular) are stored in .rela.dyn, not .rela.plt.
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- Because the IRELATIVE entries have no associated symbol name, we
need to allow arch_elf_add_plt_entry to override the name. This is
done by that callback returning PLT_OK and returning the new symbol
via libsym-chain return argument. Filtering is postponed until we
have that symbol, and the filter is applied to the whole returned
chain.
- Add linux_elf_add_plt_entry_irelative to support proper naming of
IRELATIVE PLT entries. This needs to be called from arch backend,
as the numbers of IRELATIVE relocations differ per-architecture.
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- I.e. allow returning a list of filenames, as opposed to a single
home directory name. This is to implement exactly the legacy config
file behavior on Linux.
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- <0 for errors, ==0 for OK, 1 for skip. Errors are now propagated
and can be handled as necessary without cancelling tracing.
- Clarify the comment at arch_get_sym_info.
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- This then trickles to library_init, which needs to return int
- Callers of library_init were updated to unroll their transactions
upon failure
- PPC and ARM backends were updated to match the updated interface
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- The highest bit is used to distinguish between 24-bit and 31-bit
addressing modes. Up until about 3.1, Linux did this automatically,
but stopped doing so with the following commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d4e81b35b882d96f059afdb0f98e5b6025973b09
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- This changes uses of void* to arch_addr_t, and adds tags for future
conversion of arch_addr_t to an integral type.
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This patchset adds support for Imagination's Meta architecture.
The Meta Linux kernel port will be included in the Linux Kernel
v3.9. It also uses the generic system call numbers.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
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