1. 18 Jan, 2011 3 commits
  2. 29 Dec, 2010 1 commit
    • Stephen Neuendorffer's avatar
      of/flattree: Add Kconfig for EARLY_FLATTREE · e6ce1324
      Stephen Neuendorffer authored
      The device tree code is now in two pieces: some which can be used generically
      on any platform which selects CONFIG_OF_FLATTREE, and some early which is used
      at boot time on only a few architectures.  This patch segregates the early
      code so that only those architectures which care about it need compile it.
      This also means that some of the requirements in the early code (such as
      a cmd_line variable) that most architectures (e.g. X86) don't provide
      can be ignored.
      Signed-off-by: default avatarStephen Neuendorffer <stephen.neuendorffer@xilinx.com>
      [grant.likely@secretlab.ca: remove extra blank line addition]
      [grant.likely@secretlab.ca: fixed incorrect #ifdef CONFIG_EARLY_FLATTREE check]
      [grant.likely@secretlab.ca: Made OF_EARLY_FLATTREE select instead of depend
                                  on OF_FLATTREE]
      Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
  3. 16 Dec, 2010 2 commits
  4. 29 Oct, 2010 7 commits
  5. 21 Oct, 2010 1 commit
  6. 18 Oct, 2010 2 commits
  7. 04 Oct, 2010 2 commits
  8. 19 Sep, 2010 1 commit
  9. 05 Aug, 2010 5 commits
  10. 27 Jul, 2010 1 commit
  11. 21 May, 2010 1 commit
  12. 30 Apr, 2010 3 commits
  13. 12 Mar, 2010 1 commit
  14. 27 Feb, 2010 4 commits
  15. 27 Jan, 2010 1 commit
  16. 16 Dec, 2009 5 commits
    • Martin Michlmayr's avatar
      MIPS: No longer hardwire CONFIG_EMBEDDED to y · a4609780
      Martin Michlmayr authored
      There's no reason for MIPS to select EMBEDDED.  In fact, EMBEDDED makes
      MIPS more awkward to deal with because it makes it different to the
      majority of architectures for no good reason.
      [Ralf: Historically disabling EMBEDDED had hid essential options for many
       MIPS platforms such as serial console and forced crap like VGA support
       or power managment enabled for platforms where those don't make any sense.
       The name of the option is also _very_ missleading so many users don't
       select it even where is was required for a functioning kernel.]
      Signed-off-by: default avatarMartin Michlmayr <tbm@cyrius.com>
      Cc: linux-mips@linux-mips.org
      Patchwork: http://patchwork.linux-mips.org/patch/663/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    • Ralf Baechle's avatar
      MIPS: eXcite: Remove platform. · de4148f3
      Ralf Baechle authored
      The platform has never been fully merged 
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      Cc: Thomas Koeller <thomas.koeller@baslerweb.com>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Wim Van Sebroeck <wim@iguana.be>
      Cc: linux-kernel@vger.kernel.org
      Cc: linux-mtd@lists.infradead.org
      Acked-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      Acked-by: default avatarWim Van Sebroeck <wim@iguana.be>
    • Ralf Baechle's avatar
      MIPS: Move EARLY_PRINTK to Kconfig.debug · 4dd92e15
      Ralf Baechle authored
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    • Wu Zhangjin's avatar
      MIPS: Tracing: Add function graph tracer support for MIPS · 29c5d346
      Wu Zhangjin authored
      The implementation of function graph tracer for MIPS is a little
      different from X86.
      in MIPS, gcc(with -pg) only transfer the caller's return address(at) and
      the _mcount's return address(ra) to us.
      For the kernel part without -mlong-calls:
      move at, ra
      jal _mcount
      For the module part with -mlong-calls:
      lui v1, hi16bit_of_mcount
      addiu v1, v1, low16bit_of_mcount
      move at, ra
      jal _mcount
      Without -mlong-calls,
      if the function is a leaf, it will not save the return address(ra):
      ffffffff80101298 <au1k_wait>:
      ffffffff80101298:       67bdfff0        daddiu  sp,sp,-16
      ffffffff8010129c:       ffbe0008        sd      s8,8(sp)
      ffffffff801012a0:       03a0f02d        move    s8,sp
      ffffffff801012a4:       03e0082d        move    at,ra
      ffffffff801012a8:       0c042930        jal     ffffffff8010a4c0 <_mcount>
      ffffffff801012ac:       00020021        nop
      so, we can hijack it directly in _mcount, but if the function is non-leaf, the
      return address is saved in the stack.
      ffffffff80133030 <copy_process>:
      ffffffff80133030:       67bdff50        daddiu  sp,sp,-176
      ffffffff80133034:       ffbe00a0        sd      s8,160(sp)
      ffffffff80133038:       03a0f02d        move    s8,sp
      ffffffff8013303c:       ffbf00a8        sd      ra,168(sp)
      ffffffff80133040:       ffb70098        sd      s7,152(sp)
      ffffffff80133044:       ffb60090        sd      s6,144(sp)
      ffffffff80133048:       ffb50088        sd      s5,136(sp)
      ffffffff8013304c:       ffb40080        sd      s4,128(sp)
      ffffffff80133050:       ffb30078        sd      s3,120(sp)
      ffffffff80133054:       ffb20070        sd      s2,112(sp)
      ffffffff80133058:       ffb10068        sd      s1,104(sp)
      ffffffff8013305c:       ffb00060        sd      s0,96(sp)
      ffffffff80133060:       03e0082d        move    at,ra
      ffffffff80133064:       0c042930        jal     ffffffff8010a4c0 <_mcount>
      ffffffff80133068:       00020021        nop
      but we can not get the exact stack address(which saved ra) directly in
      _mcount, we need to search the content of at register in the stack space
      or search the "s{d,w} ra, offset(sp)" instruction in the text. 'Cause we
      can not prove there is only a match in the stack space, so, we search
      the text instead.
      as we can see, if the first instruction above "move at, ra" is not a
      store instruction, there should be a leaf function, so we hijack the at
      register directly via putting &return_to_handler into it, otherwise, we
      search the "s{d,w} ra, offset(sp)" instruction to get the stack offset,
      and then the stack address. we use the above copy_process() as an
      example, we at last find "ffbf00a8", 0xa8 is the stack offset, we plus
      it with s8(fp), that is the stack address, we hijack the content via
      writing the &return_to_handler in.
      If with -mlong-calls, since there are two more instructions above "move
      at, ra", so, we can move the pointer to the position above "lui v1,
      Signed-off-by: default avatarWu Zhangjin <wuzhangjin@gmail.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Nicholas Mc Guire <der.herr@hofr.at>
      Cc: zhangfx@lemote.com
      Cc: Wu Zhangjin <wuzhangjin@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: linux-kernel@vger.kernel.org
      Cc: linux-mips@linux-mips.org
      Patchwork: http://patchwork.linux-mips.org/patch/677/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    • Wu Zhangjin's avatar
      MIPS: Tracing: Add dynamic function tracer support · 538f1952
      Wu Zhangjin authored
      With dynamic function tracer, by default, _mcount is defined as an
      "empty" function, it returns directly without any more action . When
      enabling it in user-space, it will jump to a real tracing
      function(ftrace_caller), and do the real job for us.
      Differ from the static function tracer, dynamic function tracer provides
      two functions ftrace_make_call()/ftrace_make_nop() to enable/disable the
      tracing of some indicated kernel functions(set_ftrace_filter).
      In the -v4 version, the implementation of this support is basically the same as
      X86 version does: _mcount is implemented as an empty function and ftrace_caller
      is implemented as a real tracing function respectively.
      But in this version, to support module tracing with the help of
      -mlong-calls in arch/mips/Makefile:
      MODFLAGS += -mlong-calls.
      The stuff becomes a little more complex. We need to cope with two
      different type of calling to _mcount.
      For the kernel part, the calling to _mcount(result of "objdump -hdr
      vmlinux"). is like this:
      	108:   03e0082d        move    at,ra
      	10c:   0c000000        jal     0 <fpcsr_pending>
                              10c: R_MIPS_26  _mcount
                              10c: R_MIPS_NONE        *ABS*
                              10c: R_MIPS_NONE        *ABS*
      	110:   00020021        nop
      For the module with -mlong-calls, it looks like this:
      	c:	3c030000 	lui	v1,0x0
      			c: R_MIPS_HI16	_mcount
      			c: R_MIPS_NONE	*ABS*
      			c: R_MIPS_NONE	*ABS*
      	10:	64630000 	daddiu	v1,v1,0
      			10: R_MIPS_LO16	_mcount
      			10: R_MIPS_NONE	*ABS*
      			10: R_MIPS_NONE	*ABS*
      	14:	03e0082d 	move	at,ra
      	18:	0060f809 	jalr	v1
      In the kernel version, there is only one "_mcount" string for every
      kernel function, so, we just need to match this one in mcount_regex of
      scripts/recordmcount.pl, but in the module version, we need to choose
      one of the two to match. Herein, I choose the first one with
      "R_MIPS_HI16 _mcount".
      and In the kernel verion, without module tracing support, we just need
      to replace "jal _mcount" by "jal ftrace_caller" to do real tracing, and
      filter the tracing of some kernel functions via replacing it by a nop
      but as we have described before, the instruction "jal ftrace_caller" only left
      32bit length for the address of ftrace_caller, it will fail when calling from
      the module space. so, herein, we must replace something else.
      the basic idea is loading the address of ftrace_caller to v1 via changing these
      two instructions:
      	lui	v1,0x0
      	addiu	v1,v1,0
      If we want to enable the tracing, we need to replace the above instructions to:
      	lui	v1, HI_16BIT_ftrace_caller
      	addiu	v1, v1, LOW_16BIT_ftrace_caller
      If we want to stop the tracing of the indicated kernel functions, we
      just need to replace the "jalr v1" to a nop instruction. but we need to
      replace two instructions and encode the above two instructions
      Is there a simpler solution? Yes! Here it is, in this version, we put _mcount
      and ftrace_caller together, which means the address of _mcount and
      ftrace_caller is the same:
      	j	ftrace_stub
      	...(do real tracing here)...
      	jr	ra
      	 move	ra, at
      By default, the kernel functions call _mcount, and then jump to ftrace_stub and
      return. and when we want to do real tracing, we just need to remove that "j
      ftrace_stub", and it will run through the two "nop" instructions and then do
      the real tracing job.
      what about filtering job? we just need to do this:
      	 lui v1, hi_16bit_of_mcount        <--> b 1f (0x10000004)
      	 addiu v1, v1, low_16bit_of_mcount
      	 move at, ra
      	 jalr v1
      	 				     1f: (rec->ip + 12)
      In linux-mips64, there will be some local symbols, whose name are
      prefixed by $L, which need to be filtered. thanks goes to Steven for
      writing the mips64-specific function_regex.
      In a conclusion, with RISC, things becomes easier with such a "stupid"
      trick, RISC is something like K.I.S.S, and also, there are lots of
      "simple" tricks in the whole ftrace support, thanks goes to Steven and
      the other folks for providing such a wonderful tracing framework!
      Signed-off-by: default avatarWu Zhangjin <wuzhangjin@gmail.com>
      Cc: Nicholas Mc Guire <der.herr@hofr.at>
      Cc: zhangfx@lemote.com
      Cc: Wu Zhangjin <wuzhangjin@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: linux-kernel@vger.kernel.org
      Cc: linux-mips@linux-mips.org
      Patchwork: http://patchwork.linux-mips.org/patch/675/Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>