1. 14 Dec, 2012 1 commit
  2. 10 Sep, 2012 1 commit
  3. 09 Sep, 2012 1 commit
  4. 08 Sep, 2012 23 commits
    • Jonas Termansen's avatar
      Implement WNOHANG in waitpid(2). · 07b3cc8e
      Jonas Termansen authored
    • Jonas Termansen's avatar
      Implement crt1.o, crti.o, and crtn.o. · bde41a37
      Jonas Termansen authored
      This helps running cross compiled programs as well as compiling programs
      under Sortix with gcc. There is also support for global constructors.
      Currently, cross-compiled executables uses these startup files. The current
      build system continues to use start.o, which does not offer global
      constructors and other useful features.
      Note that these using the crtX.o files requires the crtbegin.o and crtend.o
      files that ship with the cross compiler, but that should be no problem.
    • Jonas Termansen's avatar
      Improve assertions in malloc. · 2135a2d4
      Jonas Termansen authored
      This also uses the user-space available <assert.h> header.
    • Jonas Termansen's avatar
      Add setlocale(3) and localeconv(3). · 2158a169
      Jonas Termansen authored
      Ok, these are kinda hacky but they do implement a skeleton that a real
      implementation can be based upon.
    • Jonas Termansen's avatar
      Remove trailing whitespace. · 3fd270f7
      Jonas Termansen authored
    • Jonas Termansen's avatar
      Add proper implementation of scanf family. · bb3e5909
      Jonas Termansen authored
      There are still a few non-standard quirks and things that needs to be
      properly implemented but that shouldn't be too hard and the most important
      features are now implemented.
    • Jonas Termansen's avatar
      Add fabs{,f,l}(3). · cd728c9a
      Jonas Termansen authored
    • Jonas Termansen's avatar
      Add E2BIG. · 01ea5419
      Jonas Termansen authored
    • Jonas Termansen's avatar
      Make libmaxsi/c++.cpp symbols weak. · 9aba01cc
      Jonas Termansen authored
      This prepares for Sortix using libgcc.a, since it would otherwise collide
      with libmaxsi/c++.o.
    • Jonas Termansen's avatar
      Add bsearch(3). · 67553189
      Jonas Termansen authored
      This is a rather stupid implementation as it does the search in linear
      time. More importantly, it is correct and helps porting gcc. Besides, it
      can easily be fixed in due time.
    • Jonas Termansen's avatar
      Make putenv(3) copy the input string. · 90a4009c
      Jonas Termansen authored
      This violates POSIX but POSIX is stupid in this respect. Of course, this
      will ever so subtly break some applications. Not sure how this stupid design
      can be fixed without breaking backwards compatibility. Perhaps remove the
      putenv(3) function and replace it with a better replacement? (Or perhaps you
      should just use setenv(3) anyways..)
    • Jonas Termansen's avatar
      Make string.h include strings.h. · 550f9db1
      Jonas Termansen authored
      This helps gcc build since it assumes that string.h provides various
      functions that POSIX mandates is in strings.h. This is OK with me since that
      strings.h is a nasty hack anyways. Also, glibc does this.
    • Jonas Termansen's avatar
    • Jonas Termansen's avatar
      fflush(3) on fseeko(3). · a478dda4
      Jonas Termansen authored
      This caused a corruption of the resulting file if the program fwrite some
      data that is buffered, then fseeks, and then fflushes. The fwrite will then
      happen at the wrong memory location. Flushing in fseeko(3) fixes the problem
      but it may cause violate some standard or just be inefficient.
    • Jonas Termansen's avatar
      Fix wrong return value of fdio_seek. · 910197ff
      Jonas Termansen authored
    • Jonas Termansen's avatar
      Fix return value of fdio fread(3) and fwrite(3). · 29f5cd23
      Jonas Termansen authored
      Previously fread and fwrite for file descriptors would return the number of
      bytes read/written rather than the number of elements read/written. This
      breaks the C standard and broke various third party programs such as
      readelf from binutils.
    • Jonas Termansen's avatar
      Refactor libc process exit and abortion. · b4192c10
      Jonas Termansen authored
      Removed Maxsi::Process:: functions as they suck and are barely used. Gave
      the functions standard names and put them in their own source files.
      The declarations now have nice noreturn attributes attached.
    • Jonas Termansen's avatar
      Implement assert(3) properly. · 34970e63
      Jonas Termansen authored
    • Jonas Termansen's avatar
      Sort the output of ls(1). · 13c0ab63
      Jonas Termansen authored
    • Jonas Termansen's avatar
    • Jonas Termansen's avatar
    • Jonas Termansen's avatar
      Renamed sforkr(2) to tfork(2). · 755e855c
      Jonas Termansen authored
      It's a much better name if you think of it as task-fork or thread-fork in the
      sense that it either modifies this task or creates a new one. This call will
      be used to provide user-space threads as well as fork(2).
    • Jonas Termansen's avatar
      Multithreaded kernel and improvement of signal handling. · 51e3de97
      Jonas Termansen authored
      Pardon the big ass-commit, this took months to develop and debug and the
      refactoring got so far that a clean merge became impossible. The good news
      is that this commit does quite a bit of cleaning up and generally improves
      the kernel quality.
      This makes the kernel fully pre-emptive and multithreaded. This was done
      by rewriting the interrupt code, the scheduler, introducing new threading
      primitives, and rewriting large parts of the kernel. During the past few
      commits the kernel has had its device drivers thread secured; this commit
      thread secures large parts of the core kernel. There still remains some
      parts of the kernel that is _not_ thread secured, but this is not a problem
      at this point. Each user-space thread has an associated kernel stack that
      it uses when it goes into kernel mode. This stack is by default 8 KiB since
      that value works for me and is also used by Linux. Strange things tends to
      happen on x86 in case of a stack overflow - there is no ideal way to catch
      such a situation right now.
      The system call conventions were changed, too. The %edx register is now
      used to provide the errno value of the call, instead of the kernel writing
      it into a registered global variable. The system call code has also been
      updated to better reflect the native calling conventions: not all registers
      have to be preserved. This makes system calls faster and simplifies the
      assembly. In the kernel, there is no longer the event.h header or the hacky
      method of 'resuming system calls' that closely resembles cooperative
      multitasking. If a system call wants to block, it should just block.
      The signal handling was also improved significantly. At this point, signals
      cannot interrupt kernel threads (but can always interrupt user-space threads
      if enabled), which introduces some problems with how a SIGINT could
      interrupt a blocking read, for instance. This commit introduces and uses a
      number of new primitives such as kthread_lock_mutex_signal() that attempts
      to get the lock but fails if a signal is pending. In this manner, the kernel
      is safer as kernel threads cannot be shut down inconveniently, but in return
      for complexity as blocking operations must check they if they should fail.
      Process exiting has also been refactored significantly. The _exit(2) system
      call sets the exit code and sends SIGKILL to all the threads in the process.
      Once all the threads have cleaned themselves up and exited, a worker thread
      calls the process's LastPrayer() method that unmaps memory, deletes the
      address space, notifies the parent, etc. This provides a very robust way to
      terminate processes as even half-constructed processes (during a failing fork
      for instance) can be gracefully terminated.
      I have introduced a number of kernel threads to help avoid threading problems
      and simplify kernel design. For instance, there is now a functional generic
      kernel worker thread that any kernel thread can schedule jobs for. Interrupt
      handlers run with interrupts off (hence they cannot call kthread_ functions
      as it may deadlock the system if another thread holds the lock) therefore
      they cannot use the standard kernel worker threads. Instead, they use a
      special purpose interrupt worker thread that works much like the generic one
      expect that interrupt handlers can safely queue work with interrupts off.
      Note that this also means that interrupt handlers cannot allocate memory or
      print to the kernel log/screen as such mechanisms uses locks. I'll introduce
      a lock free algorithm for such cases later on.
      The boot process has also changed. The original kernel init thread in
      kernel.cpp creates a new bootstrap thread and becomes the system idle thread.
      Note that pid=0 now means the kernel, as there is no longer a system idle
      process. The bootstrap thread launches all the kernel worker threads and then
      creates a new process and loads /bin/init into it and then creates a thread
      in pid=1, which starts the system. The bootstrap thread then quietly waits
      for pid=1 to exit after which it shuts down/reboots/panics the system.
      In general, the introduction of race conditions and dead locks have forced me
      to revise a lot of the design and make sure it was thread secure. Since early
      parts of the kernel was quite hacky, I had to refactor such code. So it seems
      that the risk of dead locks forces me to write better code.
      Note that a real preemptive multithreaded kernel simplifies the construction
      of blocking system calls. My hope is that this will trigger a clean up of
      the filesystem code that current is almost beyond repair.
      Almost all of the kernel was modified during this refactoring. To the extent
      possible, these changes have been backported to older non-multithreaded
      kernel, but many changes were tightly coupled and went into this commit.
      Of interest is the implementation of the kthread_ api based on the design
      of pthreads; this library allows easy synchronization mechanisms and
      includes C++-style scoped locks. This commit also introduces new worker
      threads and tested mechanisms for interrupt handlers to schedule work in a
      kernel worker thread.
      A lot of code have been rewritten from scratch and has become a lot more
      stable and correct.
      Share and enjoy!
  5. 04 Aug, 2012 2 commits
  6. 31 Jul, 2012 2 commits
  7. 26 Jul, 2012 1 commit
  8. 25 Jul, 2012 1 commit
    • Jonas Termansen's avatar
      Refactored libmaxsi/io.cpp into multiple files. · 01df9708
      Jonas Termansen authored
      This creates more object files in the static library which reduces the size
      of statically linked files as only the relevant object files are included.
      In my experience, it reduced the size of the system initrd from 1.9 MiB to
      1.6 MiB which is valuable.
  9. 24 Jul, 2012 4 commits
  10. 22 Jul, 2012 1 commit
  11. 06 Jul, 2012 2 commits
  12. 02 Jul, 2012 1 commit