kernel: support elf32 on x86_64.

* define ELF32_COMPAT to enable ELF32 macros.
* add a flag ELF_LOAD_USER_IMAGE_TEST_EXECUTABLE to only check the format.
It will be used by load_image_internal() to check which mode to use when
loading an image.
* in arch_elf_relocate_rel(), switch to elf_addr instead of addr_t, which
would be the wrong size for elf32 on x86_64.
* the ELF compat loader reuses the relevant parts of elf.cpp and arch_elf.cpp,
excluding for instance load_kernel_add_on() or dump functions.

Change-Id: Ifa47334e5adefd45405a823a3accbd12eee5b116

kernel: Add elf_read_kernel_image_symbols()

Refactor new function out of _user_read_kernel_image_symbols(). Can be
used to get a kernel image's symbols from within the kernel as well.

system: Build using public elf.h header

Reduce duplication of code by

* Removing from elf_common.h definitions available in os/kernel/elf.h
* Deleting elf32.h and elf64.h
* Renaming elf_common.h to elf_private.h
* Updating source to build using public and private ELF header files
together

Signed-off-by: Jessica Hamilton <jessica.l.hamilton@gmail.com>

syscalls: Remove lookup_symbol syscall again.

This partially reverts b959d46dbd2f9087ae860dbced40440c28596a6e.

syscalls: Add get_stack_trace and lookup_symbol syscalls.

The get_stack_trace syscall generates a stack trace using the kernel
debugging facilities and copies the resulting return address array to
the preallocated buffer from userland. It is only possible to get a
stack trace of the current thread.

The lookup_symbol syscall can be used to look up the symbol and image
name corresponding to an address. It can be used to resolve symbols
from a stack trace generated by the get_stack_trace syscall. Only
symbols of the current team can be looked up. Note that this uses
the symbol lookup of the kernel debugger which does not support lookup
of all symbols (static functions are missing for example).

This is meant to be used in situations where more elaborate stack trace
generation, like done in the userland debugging helpers, is not possible
due to constraints.

Implemented user debugging support for x86_64.

Reused x86 arch_user_debugger.cpp, with a few minor changes to make
the code work for both 32 and 64 bit. Something isn't quite working
right, if a breakpoint is hit the kernel will hang. Other than that
everything appears to work correctly.

Merged signals-merge branch into trunk with the following changes:
* Reorganized the kernel locking related to threads and teams.
* We now discriminate correctly between process and thread signals. Signal
handlers have been moved to teams. Fixes #5679.
* Implemented real-time signal support, including signal queuing, SA_SIGINFO
support, sigqueue(), sigwaitinfo(), sigtimedwait(), waitid(), and the addition
of the real-time signal range. Closes #1935 and #2695.
* Gave SIGBUS a separate signal number. Fixes #6704.
* Implemented <time.h> clock and timer support, and fixed/completed alarm() and
[set]itimer(). Closes #5682.
* Implemented support for thread cancellation. Closes #5686.
* Moved send_signal() from <signal.h> to <OS.h>. Fixes #7554.
* Lots over smaller more or less related changes.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42116 a95241bf-73f2-0310-859d-f6bbb57e9c96

Merged the signals branch into trunk, with these changes:
* The team and thread kernel structures have been renamed to Team and Thread
respectively and moved into the new BKernel namespace.
* Several (kernel add-on) sources have been converted from C to C++ since
private kernel headers are included that are no longer C compatible.

Changes after merging:
* Fixed gcc 2 build (warnings mainly in the scary firewire bus manager).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40196 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Allow to use symbols as variables (prefixed with '@'). Now only tab completion
for variable names is missing B-}


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33723 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added elf_get_kernel_image() returning the image for the kernel.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30036 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added functions elf_create_memory_image() and
elf_add_memory_image_symbol(). The former creates and registers a new
image that has not been loaded from a file. The latter adds a symbol to
its symbol table. This is mainly a debug feature, allowing to name code
or data in memory regions that aren't associated with loaded ELF
objects.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27721 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added syscall _kern_read_kernel_image_symbols() for reading a kernel
image's symbol and string tables.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27687 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added elf_get_image_info_for_address() to get an image info for a kernel
image.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27300 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added support for userland symbol lookup in "sc" and "call". Having
used it for an hour or so, I really wonder how we could live without it.
:-)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23640 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed elf_lookup_symbol_address() to elf_debug_lookup_symbol_address() and
removed the locking it did, as that doesn't work anymore in the kernel debugger.
The function was not thought to be used outside the debugger, anyway.
Improved usage message from debugger command "ls".


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14050 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed execute property that was set accidently (since CVS days).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11896 a95241bf-73f2-0310-859d-f6bbb57e9c96

Improved headers, updated license, made C++ safe.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10909 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed elf_lookup_symbol_address() prototype - due to the way it now returns
its information, it's no longer safe to call this function outside the debugger.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7697 a95241bf-73f2-0310-859d-f6bbb57e9c96

Bye, bye elf_lookup_symbol(), hello get_image_symbol().
Also renamed elf_load_kspace() to load_kernel_add_on(), and friends.
The new unload_kernel_add_on() now has an image_id as parameter, no longer
a path (like the former elf_unload_kspace()).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7529 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed some function return codes to return a status_t where appropriate.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7330 a95241bf-73f2-0310-859d-f6bbb57e9c96

Made C++ safe.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5075 a95241bf-73f2-0310-859d-f6bbb57e9c96

Missed that one, obviously.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2451 a95241bf-73f2-0310-859d-f6bbb57e9c96

Backported the new stack crawl command ("sc", not "bt" like in NewOS) from
NewOS. Untested yet, though.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@750 a95241bf-73f2-0310-859d-f6bbb57e9c96

First round of big changes: the term team has replaced proc all over the kernel, the few kern_* syscalls have been renamed to sys_* for consistency, and other small changes. The ps app is temporarily disabled until get_next_team_info is implemented.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@557 a95241bf-73f2-0310-859d-f6bbb57e9c96

It is accomplished ...


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96

syscalls: Remove lookup_symbol syscall again.

This partially reverts b959d46dbd2f9087ae860dbced40440c28596a6e.

syscalls: Add get_stack_trace and lookup_symbol syscalls.

The get_stack_trace syscall generates a stack trace using the kernel
debugging facilities and copies the resulting return address array to
the preallocated buffer from userland. It is only possible to get a
stack trace of the current thread.

The lookup_symbol syscall can be used to look up the symbol and image
name corresponding to an address. It can be used to resolve symbols
from a stack trace generated by the get_stack_trace syscall. Only
symbols of the current team can be looked up. Note that this uses
the symbol lookup of the kernel debugger which does not support lookup
of all symbols (static functions are missing for example).

This is meant to be used in situations where more elaborate stack trace
generation, like done in the userland debugging helpers, is not possible
due to constraints.

Implemented user debugging support for x86_64.

Reused x86 arch_user_debugger.cpp, with a few minor changes to make
the code work for both 32 and 64 bit. Something isn't quite working
right, if a breakpoint is hit the kernel will hang. Other than that
everything appears to work correctly.

Merged signals-merge branch into trunk with the following changes:
* Reorganized the kernel locking related to threads and teams.
* We now discriminate correctly between process and thread signals. Signal
handlers have been moved to teams. Fixes #5679.
* Implemented real-time signal support, including signal queuing, SA_SIGINFO
support, sigqueue(), sigwaitinfo(), sigtimedwait(), waitid(), and the addition
of the real-time signal range. Closes #1935 and #2695.
* Gave SIGBUS a separate signal number. Fixes #6704.
* Implemented <time.h> clock and timer support, and fixed/completed alarm() and
[set]itimer(). Closes #5682.
* Implemented support for thread cancellation. Closes #5686.
* Moved send_signal() from <signal.h> to <OS.h>. Fixes #7554.
* Lots over smaller more or less related changes.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42116 a95241bf-73f2-0310-859d-f6bbb57e9c96

Merged the signals branch into trunk, with these changes:
* The team and thread kernel structures have been renamed to Team and Thread
respectively and moved into the new BKernel namespace.
* Several (kernel add-on) sources have been converted from C to C++ since
private kernel headers are included that are no longer C compatible.

Changes after merging:
* Fixed gcc 2 build (warnings mainly in the scary firewire bus manager).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40196 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Allow to use symbols as variables (prefixed with '@'). Now only tab completion
for variable names is missing B-}


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33723 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added elf_get_kernel_image() returning the image for the kernel.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30036 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added functions elf_create_memory_image() and
elf_add_memory_image_symbol(). The former creates and registers a new
image that has not been loaded from a file. The latter adds a symbol to
its symbol table. This is mainly a debug feature, allowing to name code
or data in memory regions that aren't associated with loaded ELF
objects.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27721 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added syscall _kern_read_kernel_image_symbols() for reading a kernel
image's symbol and string tables.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27687 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added elf_get_image_info_for_address() to get an image info for a kernel
image.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27300 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added support for userland symbol lookup in "sc" and "call". Having
used it for an hour or so, I really wonder how we could live without it.
:-)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23640 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed elf_lookup_symbol_address() to elf_debug_lookup_symbol_address() and
removed the locking it did, as that doesn't work anymore in the kernel debugger.
The function was not thought to be used outside the debugger, anyway.
Improved usage message from debugger command "ls".


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14050 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed execute property that was set accidently (since CVS days).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11896 a95241bf-73f2-0310-859d-f6bbb57e9c96

Improved headers, updated license, made C++ safe.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10909 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed elf_lookup_symbol_address() prototype - due to the way it now returns
its information, it's no longer safe to call this function outside the debugger.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7697 a95241bf-73f2-0310-859d-f6bbb57e9c96

Bye, bye elf_lookup_symbol(), hello get_image_symbol().
Also renamed elf_load_kspace() to load_kernel_add_on(), and friends.
The new unload_kernel_add_on() now has an image_id as parameter, no longer
a path (like the former elf_unload_kspace()).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7529 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed some function return codes to return a status_t where appropriate.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7330 a95241bf-73f2-0310-859d-f6bbb57e9c96

Made C++ safe.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5075 a95241bf-73f2-0310-859d-f6bbb57e9c96

Missed that one, obviously.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2451 a95241bf-73f2-0310-859d-f6bbb57e9c96

Backported the new stack crawl command ("sc", not "bt" like in NewOS) from
NewOS. Untested yet, though.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@750 a95241bf-73f2-0310-859d-f6bbb57e9c96

First round of big changes: the term team has replaced proc all over the kernel, the few kern_* syscalls have been renamed to sys_* for consistency, and other small changes. The ps app is temporarily disabled until get_next_team_info is implemented.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@557 a95241bf-73f2-0310-859d-f6bbb57e9c96

It is accomplished ...


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96