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sel4: minimalistic roottask

This commit is contained in:
Norman Feske 2014-10-15 14:48:45 +02:00 committed by Christian Helmuth
parent 456d81f517
commit 2b24593758
20 changed files with 1184 additions and 5 deletions
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320
repos/base-sel4/doc/notes.txt
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@ -24,10 +24,10 @@ Following the convention to host each kernel in its dedicated _base-<kernel>_
source repository, the seL4-specific code will go to _base-sel4_. This way,
we can cleanly hold the seL4-specific code apart from generic Genode code.
For the start, the new repository will contain three things: This notes
document at _doc/_, the port-description file for downloading the seL4
For the start, the new repository will contain two things: This notes
document at _doc/_ and the port-description file for downloading the seL4
kernel _(ports/sel4.port)_ accompanied with the corresponding hash file
_(ports/sel4.hash)_, and a bunch of small tests _(src/test/sel4/)_
_(ports/sel4.hash)_.
Since seL4 is hosted on GitHub, writing a port-description file is easy.
We can simply use _base-nova/ports/nova.port_ as a template and adapt it:
@ -293,4 +293,318 @@ a root task to the system.
A root task for exercising the kernel interface
===============================================
At this point, there are two options. We could either start with a very
minimalistic hello-world program that is completely unrelated to Genode. Such
a root-task from scratch could be used to explore the individual system calls
before jumping into Genode. The second option would be to go directly for
a Genode program, which includes a proper C++ runtime and Genode's generic
linker script.
I went for the latter option and created a simple test program at
_base-sel4/src/test/sel4/_. The _target.mk_ file looks as follows:
! TARGET = test-sel4
! SRC_CC = main.cc
! LIBS = cxx startup
The 'main' function of the _main.cc_ file does no much except for writing
at an illegal (yet known) address:
! int main()
! {
! *(int *)0x1122 = 0;
! return 0;
! }
When attempting to build the program by issuing 'make test/sel4' from within
our build directory, the build system will attempt to compile the C++ runtime,
which, in turn, depends on a few Genode headers. Some headers are readily
provided by the _base/_ repository but others are expected to be supplied
by the _base-<kernel>_ repository. The compile errors look like this:
! COMPILE malloc_free.o
! In file included from repos/base/include/parent/capability.h:17:0,
! from repos/base/include/base/env.h:20,
! from repos/base/src/base/cxx/malloc_free.cc:17:
! repos/base/include/base/capability.h:21:31:
! fatal error: base/native_types.h: No such file or directory
For now, we can supply a dummy version of this header, which contain
preliminary type definitions. To see, which types are expected from which
header file, we can take cues from the other _base-<kernel>_ platforms.
At link time, we will observe plenty of undefined references originating
from the startup code. Most of those references concern basic data
structures such as the AVL tree. Normally, those symbols are provided by
the so-called _base-common_ library, which is used both core and non-core
programs. We can take a copy of a _base-common.mk_ file from one of the
other base platforms as a starting point. I decided to go for the version
provided by _base-nova_. With the base-common library present, we can
replace the 'cxx' and 'startup' libs by the base-common library in the
'LIBS' declaration of our test-sel4 program. Because base-common already
depends on both 'cxx' and 'startup', there is no need to specify those
libraries twice.
On the attempt to compile the base-common library, we will stumble over
further missing headers such as _ipc_msgbuf.h_. Here the _base-linux_
version of this file becomes handy because it is free-standing.
When compiling _lock.cc_, the compiler complaints about the missing
_lock_helper.h_ file. This platform-specific file that is internally used by
the lock implementation is normally expected
at _base-<kernel>/src/base/lock/_. For now, just for getting the binary
linked, we provide empty dummies:
! static inline void thread_yield() { }
! static inline void thread_switch_to(Genode::Thread_base *thread_base) { }
! static inline void thread_stop_myself() { }
!
! static inline bool thread_check_stopped_and_restart(Genode::Thread_base *)
! {
! return false;
! }
The next missing piece is the platform-specific implementation of the IPC
API _(ipc/ipc.cc and ipc/pager.cc)_, which are expected to reside at
_base-sel4/src/base/ipc/_. We just take the simplest version of the other
base platforms (in this case _base-codezero/src/base/ipc/) and strip it down
to become mere dummy.
By adding the base-common library, the number of unresolved references
decreased by a great amount. Some functions are still unresolved.
There are many references to 'printf', which is not part of the base-common
library because core uses a different back end (typically a kernel debugger)
than non-core processes (using a session to core's LOG service). Because
our test plays the role of a root task, we can include core's version by
adding 'base/src/base/console/core_printf.cc' as source to our target
description file.
! SRC_CC += base/console/core_printf.cc
! vpath %.cc $(BASE_DIR)/src
The back end of 'core_printf.cc' has to be provided by a header at
_base-sel4/src/base/console/core_console.h_. For now, we just provide
an empty implementation of '_out_char'. To let the compiler find the
header, we need to add the extend the include search path as follows:
! INC_DIR += $(REP_DIR)/src/base/console
For the unresolved references for 'env_context_area_ram_session' and
'env_context_area_rm_session', the following dummy will do:
! #include <ram_session/ram_session.h>
! #include <rm_session/rm_session.h>
!
! namespace Genode {
! Rm_session *env_context_area_rm_session() { return nullptr; }
! Ram_session *env_context_area_ram_session() { return nullptr; }
! }
The remaining pieces of the puzzle is the 'Genode::env()' function, which
is an accessor to the Genode environment. Because the Genode environment does
not exist yet, we provide a dummy 'env' called _mini_env_. Initially, this
implementation of the 'Genode::Env' interface merely returns dummy values
(null pointers and invalid capabilies).
After this step, the test-sel4 target links successfully. To use it as
roottask, we have to modify our _test.run_ script by
# Adding a build step
! build { test/sel4 }
# Specifying the test-sel4 binary as boot module so that the our run
environment includes it in the boot image and appends the file as module
to the boot-loader configuration.
! build_boot_image "test-sel4"
When issuing 'make run/test' now, we get the following messages from the
kernel:
! Detected 1 boot module(s):
! module #0: start=0x169000 end=0x186754 size=0x1d754
! name='/genode/test-sel4'
! ELF-loading userland images from boot modules:
! module #0 for node #0: size=0x27000 v_entry=0x136cc
! v_start=0x0 v_end=0x27000
! p_start=0x187000 p_end=0x1ae000
! Moving loaded userland images to final location:
! from=0x187000 to=0x15e000 size=0x27000
!
! Starting node #0
! Caught cap fault in send phase at address 0x0
! while trying to handle:
! vm fault on data at address 0x9090c3fb with status 0x4
! in thread 0xe0189880 at address 0x314a
Assuming that 'v_start' and 'v_end' stand for the virtual address range
if the loaded binary, those numbers look weird. Normally, Genode binaries
are linked at a much higher address, e.g., 0x1000000. By inspecting the
binary via the readelf commend, it turns out that we haven't yet declared the
link address for the seL4 platform. So its time to introduce a so-called spec
file for the "sel4" build-spec value. The new file _base-sel4/mk/spec-sel4.mk_
will be incorporated into the build process whenever the 'SPEC' declaration of
the build directory has the value "sel4" listed. To define the default link
address for the platform, the file has the following content:
! LD_TEXT_ADDR ?= 0x01000000
When issuing 'make test/sel4 VERBOSE=', we can see the link address specified
at the linker command line. Another look at the binary via readelf confirms
that the location of the text segment looks good now. Re-executing the run
script produces the same result as before though. But the last message is
quite helpful:
! vm fault on data at address 0x0 with status 0x4
! in thread 0xe0189880 at address 0x100312b
The last address lies well within the text segment of our binary. It seems
that the kernel has kicked off the execution of our root task (presumably
at the entry point address as found in the ELF binary). At some point, our
"root task" de-references a null pointer. Given that several of the dummy
functions that we just created, return null pointers, this is hardly a
surprise. So let us have a look how far we have come by inspecting the
fault address 0x100312b using
! objdump -lSd bin/test-sel4 | less
In less, we search for the pattern "100312b". We see that the surrounding
code belongs to the heap implementation ('Heap::_allocate_dataspace'). It
seems that someone is trying to use 'Genode::env()->heap()'. To confirm
this assumption, we can use Qemu's GDB stub to obtain a backtrace. We have
to take the following steps:
# We want to halt the execution at the point where the fault would happen
instead of triggering a page fault. The easiest way to accomplish that
is to insert an infinite loop at the right spot. The infinite loop serve
us as a poor man's break point. In our case, we add a 'for (;;);' statement
right at the beginning of the '_allocate_dataspace' function in
_repos/base/src/base/heap/heap.cc_. When re-executing the run script after
this change, we can see that the fault message won't appear.
# We cancel the execution of the run script and start Qemu manually using
the command-line arguments that are found in the log output (the message
"spawn qemu ...". To enable Qemu's GDB stub, we have to append "-s" as
argument.
! qemu-system-i386 -nographic -m 64 -cdrom var/run/test.iso -s
# When qemu is running, we start GDB from another shell (changing to
our build directory) as follows:
! gdb bin/test-sel4 -ex "target remote :1234"
# Listing the backtrace via the 'bt' command is quite revealing (output
slightly edited for brevity):
! (gdb) bt
! #0 Genode::Heap::_allocate_dataspace
! at genode/repos/base/src/base/heap/heap.cc:57
! #1 0x010030b9 in Genode::Heap::_unsynchronized_alloc
! at genode/repos/base/src/base/heap/heap.cc:181
! #2 0x01003155 in Genode::Heap::alloc
! at genode/repos/base/src/base/heap/heap.cc:199
! #3 0x01010732 in malloc
! #4 0x0100f539 in start_fde_sort
! #5 init_object
! at ../../../../../../contrib/gcc-4.7.2/libgcc/unwind-dw2-fde.c:768
! #6 search_object
! at ../../../../../../contrib/gcc-4.7.2/libgcc/unwind-dw2-fde.c:958
! #7 0x01010375 in _Unwind_Find_registered_FDE
! at ../../../../../../contrib/gcc-4.7.2/libgcc/unwind-dw2-fde.c:1022
! #8 _Unwind_Find_FDE
! at ../../../../../../contrib/gcc-4.7.2/libgcc/unwind-dw2-fde-dip.c:440
! #9 0x0100d4c3 in uw_frame_state_for
! #10 0x0100dff8 in uw_init_context_1
! at ../../../../../../contrib/gcc-4.7.2/libgcc/unwind-dw2.c:1500
! #11 0x0100e3ea in _Unwind_RaiseException
! #12 0x01011f51 in __cxa_throw ()
! #13 0x01013751 in init_main_thread ()
! at genode/repos/base/src/platform/init_main_thread.cc:119
! #14 0x010134fe in _start ()
! at genode/repos/base/src/platform/x86_32/crt0.s:47
We can see that Genode's startup code tries to throw the first C++ exception.
There is a lengthy comment at the corresponding code portion that explains
the rationale behind throwing an exception right from the startup code.
The exception handling, in particular the stack unwinding) is done by the
GCC support library, which eventually calls 'malloc' to allocate some
backing store for metadata. Genode has no 'malloc' function. But for making
the GCC support library happy (which expects a C runtime to be present), our
Genode-specific C++ support code in the form of the 'cxx' library comes with
a library-local version of malloc _(base/src/base/cxx/malloc_free.cc)_. This
malloc implementation uses a separate 'Genode::Heap' instance. The instance
has an initial capacity of 512 bytes. If the allocations exceed this capacity,
this heap will try to expand using 'env()->ram_session()' as backing store.
This is why the '_allocate_dataspace' function was called. At the current
stage, we don't have an implementation of 'env()->ram_session()'. To work
around this early allocation issue, we can simply increase the capacity of
the 'initial_block', let's say by factor 10. When re-executing the run script
now, '_allocate_dataspace' won't be called. Hence, we execution won't get
stuck in our infinite loop (we can remove the loop either way now). Instead,
we get another null-pointer dereference:
! vm fault on data at address 0x0 with status 0x4
! in thread 0xe0189880 at address 0x1003ab7
The procedure to investigate the reason for this page fault is exactly the
same as for the first one, using objdump, infinite loops, and Qemu's GDB stub.
This time, the null-pointer dereference occurs in
_base/src/base/thread/thread.cc_ on the attempt to allocate so-called
thread context for the main thread. Such thread contexts contain the
stacks and meta data of threads. They are placed in a dedicated virtual
memory area that is manually managed by the process.
For our minimalistic root task, we don't have Genode's address-space
management facilities at our disposal yet. So we have to side-step the
'_alloc_context' function somehow. This can be accomplished by using
custom version of _thread.cc_ instead of the one provided by the _base/_
repository. So we remove _thread.cc_ from the base-common library for now
and add a new _thread.cc_ file to our test-sel4 target. The following
dummy stub will do for now:
! static Thread_base::Context *main_context()
! {
! enum { STACK_SIZE = sizeof(long)*4*1024 };
!
! static long buffer[STACK_SIZE/sizeof(long)];
!
! /* the context is located beyond the top of the stack */
! addr_t const context_addr = (addr_t)buffer + sizeof(buffer)
! - sizeof(Thread_base::Context);
!
! Thread_base::Context *context = (Thread_base::Context *)context_addr;
! context->stack_base = (addr_t)buffer;
! return context;
! }
!
! Thread_base *Thread_base::myself() { return nullptr; }
!
! Thread_base::Thread_base(const char *name, size_t stack_size, Type type,
! Cpu_session *cpu_session)
! :
! _cpu_session(cpu_session), _context(main_context())
! {
! strncpy(_context->name, name, sizeof(_context->name));
! _context->thread_base = this;
!
! _init_platform_thread(type);
! }
!
! Thread_base::Thread_base(const char *name, size_t stack_size, Type type)
! : Thread_base(name, stack_size, type, nullptr) { }
!
! Thread_base::~Thread_base() { _deinit_platform_thread(); }
Genode's startup code will change the stack of the main thread prior calling
the main function. This way, the stack can be placed at a dedicated area of
the virtual address space (thread-context area). By not placing the stack
close to the program image, stack overflows won't silently corrupt data but
trigger a page fault. The code above, however, allocates a dummy context for
the main thread in the BSS segment (the 'buffer' used as backing store for the
context is a static variable). This code above is intended as an interim
solution for the initialization of the main thread only.
When executing our run script again, we will get the following message:
! vm fault on data at address 0x1122 with status 0x6
! in thread 0xe0189880 at address 0x1000190
This message is caused by the main function of our test program! In this
function, we deliberately triggered a fault at the address 0x1122 via
the statement '*(int *)0x1122 = 0;'

112
repos/base-sel4/include/base/ipc_msgbuf.h Normal file
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@ -0,0 +1,112 @@
/*
* \brief seL4-specific layout of IPC message buffer
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__BASE__IPC_MSGBUF_H_
#define _INCLUDE__BASE__IPC_MSGBUF_H_
namespace Genode {
/**
* IPC message buffer layout
*/
class Msgbuf_base
{
public:
enum { MAX_CAPS_PER_MSG = 8 };
protected:
/*
* Capabilities to be transferred
*/
int _caps[MAX_CAPS_PER_MSG];
Genode::size_t _used_caps;
Genode::size_t _read_cap_index;
/**
* Maximum size of plain-data message payload
*/
Genode::size_t _size;
/**
* Actual size of plain-data message payload
*/
Genode::size_t _used_size;
char _msg_start[]; /* symbol marks start of message buffer data */
/*
* No member variables are allowed beyond this point!
*/
public:
char buf[];
Msgbuf_base() { reset_caps(); }
/**
* Return size of message buffer
*/
inline Genode::size_t size() const { return _size; };
/**
* Return address of message buffer
*/
inline void *addr() { return &_msg_start[0]; };
void reset_caps() { _used_caps = 0; _read_cap_index = 0; }
bool append_cap(int cap)
{
if (_used_caps == MAX_CAPS_PER_MSG)
return false;
_caps[_used_caps++] = cap;
return true;
}
int read_cap()
{
if (_read_cap_index == _used_caps)
return -1;
return _caps[_read_cap_index++];
}
size_t used_caps() const { return _used_caps; }
int cap(unsigned index) const
{
return index < _used_caps ? _caps[index] : -1;
}
};
/**
* Pump up IPC message buffer to specified buffer size
*/
template <unsigned BUF_SIZE>
class Msgbuf : public Msgbuf_base
{
public:
char buf[BUF_SIZE];
Msgbuf() { _size = BUF_SIZE; }
};
}
#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */

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repos/base-sel4/include/base/ipc_pager.h Normal file
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@ -0,0 +1,159 @@
/*
* \brief Pager support for Genode on seL4
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__BASE__IPC_PAGER_H_
#define _INCLUDE__BASE__IPC_PAGER_H_
#include <base/cache.h>
#include <base/ipc.h>
#include <base/stdint.h>
#include <base/native_types.h>
namespace Genode {
class Mapping
{
private:
addr_t _from_phys_addr;
addr_t _to_virt_addr;
size_t _num_pages;
bool _writeable;
enum { PAGE_SIZE_LOG2 = 12 };
public:
/**
* Constructor
*/
Mapping(addr_t dst_addr, addr_t src_addr,
Cache_attribute const cacheability, bool io_mem,
unsigned l2size = PAGE_SIZE_LOG2,
bool rw = true)
:
_from_phys_addr(src_addr),
_to_virt_addr(dst_addr),
_num_pages(1 << (l2size - PAGE_SIZE_LOG2)),
_writeable(rw)
{ }
/**
* Construct invalid mapping
*/
Mapping() : _num_pages(0) { }
/**
* Prepare map operation
*
* No preparations are needed on Codezero because all mapping
* originate from the physical address space.
*/
void prepare_map_operation() { }
addr_t from_phys() const { return _from_phys_addr; }
addr_t to_virt() const { return _to_virt_addr; }
size_t num_pages() const { return _num_pages; }
bool writeable() const { return _writeable; }
};
/**
* Special paging server class
*/
class Ipc_pager : public Native_capability
{
private:
Native_thread_id _last; /* faulted thread */
addr_t _pf_addr; /* page-fault address */
addr_t _pf_ip; /* instruction pointer of faulter */
bool _pf_write; /* true on write fault */
Mapping _reply_mapping;
public:
/**
* Constructor
*/
Ipc_pager();
/**
* Wait for a new page fault received as short message IPC
*/
void wait_for_fault();
/**
* Reply current page-fault and wait for a new one
*/
void reply_and_wait_for_fault();
/**
* Request instruction pointer of current page fault
*/
addr_t fault_ip() { return _pf_ip; }
/**
* Request fault address of current page fault
*/
addr_t fault_addr() { return _pf_addr; }
/**
* Set parameters for next reply
*/
void set_reply_mapping(Mapping m) { _reply_mapping = m; }
/**
* Set destination for next reply
*/
void set_reply_dst(Native_capability pager_object) {
_last = pager_object.local_name(); }
/**
* Answer call without sending a mapping
*
* This function is used to acknowledge local calls from one of
* core's region-manager sessions.
*/
void acknowledge_wakeup();
/**
* Return thread ID of last faulter
*/
Native_thread_id last() const { return _last; }
/**
* Return badge for faulting thread
*/
unsigned long badge() const { return _last; }
/**
* Return true if page fault was a write fault
*/
bool is_write_fault() const { return _pf_write; }
/**
* Return true if last fault was an exception
*/
bool is_exception() const
{
/*
* Reflection of exceptions is not supported on this platform.
*/
return false;
}
};
}
#endif /* _INCLUDE__BASE__IPC_PAGER_H_ */

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repos/base-sel4/include/base/native_types.h Normal file
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/*
* \brief Platform-specific type definitions
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__BASE__NATIVE_TYPES_H_
#define _INCLUDE__BASE__NATIVE_TYPES_H_
#include <base/stdint.h>
#include <base/native_capability.h>
namespace Genode {
struct Cap_dst_policy
{
typedef int Dst;
static bool valid(Dst tid) { return false; }
static Dst invalid() { return true; }
static void copy(void* dst, Native_capability_tpl<Cap_dst_policy>* src);
};
class Platform_thread;
typedef int Native_thread_id;
struct Native_thread
{
int id;
/**
* Only used in core
*
* For 'Thread' objects created within core, 'pt' points to
* the physical thread object, which is going to be destroyed
* on destruction of the 'Thread'.
*/
Platform_thread *pt;
};
typedef Native_capability_tpl<Cap_dst_policy> Native_capability;
typedef struct { } Native_utcb;
struct Native_config
{
/**
* Thread-context area configuration.
*/
static constexpr addr_t context_area_virtual_base() {
return 0x40000000UL; }
static constexpr addr_t context_area_virtual_size() {
return 0x10000000UL; }
/**
* Size of virtual address region holding the context of one thread
*/
static constexpr addr_t context_virtual_size() { return 0x00100000UL; }
};
struct Native_pd_args { };
typedef int Native_connection_state;
}
#endif /* _INCLUDE__BASE__NATIVE_TYPES_H_ */

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repos/base-sel4/lib/mk/base-common.inc Normal file
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#
# \brief Portions of base library shared by core and non-core processes
# \author Norman Feske
# \date 2013-02-14
#
LIBS += cxx startup
SRC_CC += ipc/ipc.cc ipc/pager.cc
SRC_CC += avl_tree/avl_tree.cc
SRC_CC += allocator/slab.cc
SRC_CC += allocator/allocator_avl.cc
SRC_CC += heap/heap.cc heap/sliced_heap.cc
SRC_CC += console/console.cc
SRC_CC += child/child.cc
SRC_CC += process/process.cc
SRC_CC += elf/elf_binary.cc
SRC_CC += lock/lock.cc
SRC_CC += signal/signal.cc signal/common.cc
SRC_CC += server/server.cc
#SRC_CC += thread/thread.cc
SRC_CC += thread/trace.cc
SRC_CC += thread/myself.cc
SRC_CC += thread/context_allocator.cc
#SRC_CC += env/cap_map.cc
INC_DIR += $(REP_DIR)/src/base/lock
INC_DIR += $(BASE_DIR)/src/base/lock
INC_DIR += $(BASE_DIR)/src/base/thread
vpath %.cc $(REP_DIR)/src/base
vpath %.cc $(BASE_DIR)/src/base
# vi: set ft=make :

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repos/base-sel4/lib/mk/x86_32/base-common.mk Normal file
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@ -0,0 +1 @@
include $(REP_DIR)/lib/mk/base-common.inc

2
repos/base-sel4/lib/mk/x86_32/kernel.mk
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@ -16,7 +16,7 @@ LINKER_OPT_PREFIX := -Wl,
build_kernel:
$(VERBOSE)$(MAKE) \
TOOLPREFIX=$(CROSS_DEV_PREFIX) \
ARCH=ia32 PLAT=pc99 DEBUG=1 V=1 \
ARCH=ia32 PLAT=pc99 DEBUG=1 \
LDFLAGS+=-nostdlib LDFLAGS+=-Wl,-nostdlib \
$(addprefix LDFLAGS+=$(LINKER_OPT_PREFIX),$(LD_MARCH)) \
CFLAGS+=-fno-builtin-printf \

1
repos/base-sel4/mk/spec-sel4.mk Normal file
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@ -0,0 +1 @@
LD_TEXT_ADDR ?= 0x01000000

4
repos/base-sel4/run/test.run
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@ -1,6 +1,8 @@
build { test/sel4 }
create_boot_directory
build_boot_image ""
build_boot_image "test-sel4"
append qemu_args " -nographic -m 64 "

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repos/base-sel4/src/base/console/core_console.h Normal file
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/*
* \brief Console backend for seL4
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#include <base/console.h>
namespace Genode
{
class Core_console : public Console
{
protected:
void _out_char(char c) { }
};
}

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/*
* \brief seL4 implementation of the IPC API
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <base/ipc.h>
#include <base/printf.h>
#include <base/blocking.h>
#include <util/misc_math.h>
using namespace Genode;
/*****************
** Ipc_ostream **
*****************/
void Ipc_ostream::_send()
{
PDBG("not implemented");
_write_offset = sizeof(umword_t);
}
Ipc_ostream::Ipc_ostream(Native_capability dst, Msgbuf_base *snd_msg)
:
Ipc_marshaller((char *)snd_msg->addr(), snd_msg->size()),
_snd_msg(snd_msg), _dst(dst)
{
_write_offset = sizeof(umword_t);
}
/*****************
** Ipc_istream **
*****************/
void Ipc_istream::_wait()
{
PDBG("not implemented");
_read_offset = sizeof(umword_t);
}
Ipc_istream::Ipc_istream(Msgbuf_base *rcv_msg)
:
Ipc_unmarshaller((char *)rcv_msg->addr(), rcv_msg->size()),
_rcv_msg(rcv_msg)
{
_read_offset = sizeof(umword_t);
}
Ipc_istream::~Ipc_istream() { }
/****************
** Ipc_client **
****************/
void Ipc_client::_call()
{
PDBG("not implemented");
_write_offset = _read_offset = sizeof(umword_t);
}
Ipc_client::Ipc_client(Native_capability const &srv, Msgbuf_base *snd_msg,
Msgbuf_base *rcv_msg, unsigned short)
: Ipc_istream(rcv_msg), Ipc_ostream(srv, snd_msg), _result(0)
{ }
/****************
** Ipc_server **
****************/
void Ipc_server::_prepare_next_reply_wait()
{
/* now we have a request to reply */
_reply_needed = true;
/* leave space for return value at the beginning of the msgbuf */
_write_offset = 2*sizeof(umword_t);
/* receive buffer offset */
_read_offset = sizeof(umword_t);
}
void Ipc_server::_wait()
{
/* wait for new server request */
try { Ipc_istream::_wait(); } catch (Blocking_canceled) { }
_prepare_next_reply_wait();
}
void Ipc_server::_reply()
{
try { _send(); } catch (Ipc_error) { }
_prepare_next_reply_wait();
}
void Ipc_server::_reply_wait()
{
if (_reply_needed)
_reply();
_wait();
}
Ipc_server::Ipc_server(Msgbuf_base *snd_msg,
Msgbuf_base *rcv_msg)
:
Ipc_istream(rcv_msg), Ipc_ostream(Native_capability(), snd_msg),
_reply_needed(false)
{ }

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/*
* \brief Pager support for seL4
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <base/ipc_pager.h>
#include <base/printf.h>
using namespace Genode;
/***************
** IPC pager **
***************/
void Ipc_pager::wait_for_fault()
{
PDBG("not implemented");
}
void Ipc_pager::reply_and_wait_for_fault()
{
PDBG("not implemented");
}
void Ipc_pager::acknowledge_wakeup()
{
PDBG("not implemented");
}
Ipc_pager::Ipc_pager() { }

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/*
* \brief seL4-specific helper functions for the Lock implementation
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <base/native_types.h>
#include <base/thread.h>
static inline void thread_yield() { }
static inline bool thread_check_stopped_and_restart(Genode::Thread_base *)
{
return false;
}
static inline void thread_switch_to(Genode::Thread_base *thread_base) { }
static inline void thread_stop_myself() { }

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/*
* \brief Thread bootstrap code
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <base/thread.h>
#include <base/env.h>
/*****************************
** Startup library support **
*****************************/
void prepare_init_main_thread() { }
void prepare_reinit_main_thread() { prepare_init_main_thread(); }
/*****************
** Thread_base **
*****************/
void Genode::Thread_base::_thread_bootstrap() { }

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/*
* \brief seL4-specific implementation of the Thread API
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <base/thread.h>
#include <base/printf.h>
#include <base/sleep.h>
#include <base/env.h>
#include <base/rpc_client.h>
#include <session/session.h>
using namespace Genode;
/**
* Entry point entered by new threads
*/
//void Thread_base::_thread_start()
//{
// PDBG("not implemented");
//}
/*****************
** Thread base **
*****************/
void Thread_base::_init_platform_thread(size_t, Type type)
{
PDBG("not implemented");
}
void Thread_base::_deinit_platform_thread()
{
PDBG("not implemented");
}
void Thread_base::start()
{
PDBG("not implemented");
}
void Thread_base::cancel_blocking()
{
PDBG("not implemented");
}

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/*
* \brief Dummy context_area helper
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#include <ram_session/ram_session.h>
#include <rm_session/rm_session.h>
namespace Genode {
Rm_session *env_context_area_rm_session() { return nullptr; }
Ram_session *env_context_area_ram_session() { return nullptr; }
}

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/*
* \brief Test for exercising the seL4 kernel interface
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
int main()
{
*(int *)0x1122 = 0;
return 0;
}

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/*
* \brief Minimalistic implementation of the Genode::env
* \author Norman Feske
* \date 2014-10-14
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#include <base/env.h>
namespace Genode { struct Mini_env; }
struct Genode::Mini_env : Env
{
Parent *parent() { return nullptr; }
Ram_session *ram_session() { return nullptr; }
Ram_session_capability ram_session_cap() { return Ram_session_capability(); }
Cpu_session *cpu_session() { return nullptr; }
Cpu_session_capability cpu_session_cap() { return Cpu_session_capability(); }
Rm_session *rm_session() { return nullptr; }
Pd_session *pd_session() { return nullptr; }
Allocator *heap() { return nullptr; }
};
namespace Genode {
Env *env() {
static Mini_env inst;
return &inst;
}
}

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TARGET = test-sel4
SRC_CC = main.cc context_area.cc mini_env.cc thread.cc
LIBS = base-common
SRC_CC += base/console/core_printf.cc
INC_DIR += $(REP_DIR)/src/base/console
vpath %.cc $(BASE_DIR)/src
SRC_CC += thread_sel4.cc
vpath thread_sel4.cc $(REP_DIR)/src/base/thread
SRC_CC += thread_bootstrap.cc
vpath thread_bootstrap.cc $(REP_DIR)/src/base/thread

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/*
* \brief Implementation of the Thread API
* \author Norman Feske
* \date 2014-10-15
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#include <base/thread.h>
#include <base/env.h>
#include <base/snprintf.h>
#include <util/string.h>
#include <util/misc_math.h>
using namespace Genode;
static Thread_base::Context *main_context()
{
enum { STACK_SIZE = sizeof(long)*4*1024 };
static long buffer[STACK_SIZE/sizeof(long)];
/* the context is located beyond the top of the stack */
addr_t const context_addr = (addr_t)buffer + sizeof(buffer)
- sizeof(Thread_base::Context);
Thread_base::Context *context = (Thread_base::Context *)context_addr;
context->stack_base = (addr_t)buffer;
return context;
}
Thread_base *Thread_base::myself() { return nullptr; }
Thread_base::Thread_base(size_t, const char *name, size_t stack_size, Type type,
Cpu_session *cpu_session)
:
_cpu_session(cpu_session), _context(main_context())
{
strncpy(_context->name, name, sizeof(_context->name));
_context->thread_base = this;
_init_platform_thread(type);
}
Thread_base::Thread_base(size_t quota, const char *name, size_t stack_size, Type type)
: Thread_base(quota, name, stack_size, type, nullptr) { }
Thread_base::~Thread_base() { _deinit_platform_thread(); }