Skip to content

L
linux
Switch branch/tag
  1. 12 Jul, 2011 5 commits
    • Eric Miao's avatar
      ARM: pxa: avoid accessing interrupt registers directly · 5d284e35
      Eric Miao authored 
      Signed-off-by: default avatarEric Miao <eric.y.miao@gmail.com>
      5d284e35
    • Eric Miao's avatar
      ARM: pxa: add common header file for pxa3xx · 9c864410
      Eric Miao authored 
      Signed-off-by: default avatarEric Miao <eric.y.miao@gmail.com>
      9c864410
    • Haojian Zhuang's avatar
      ARM: pxa: add clk_set_rate() · 52585ccd
      Haojian Zhuang authored 
      Since there're mulitple clock rates in some device controllers, enable
clk_set_rate() for this usage.
Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: default avatarEric Miao <eric.y.miao@gmail.com>
      52585ccd
    • Eric Miao's avatar
      ARM: pxa: enable AUTO_ZRELADDR · 4e234cc0
      Eric Miao authored 
      Signed-off-by: default avatarEric Miao <eric.y.miao@gmail.com>
      4e234cc0
    • Russell King - ARM Linux's avatar
      ARM: introduce handle_IRQ() not to dump exception stack · a4841e39
      Russell King - ARM Linux authored 
      On Mon, Jul 11, 2011 at 3:52 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:

...

> The __exception annotation on a function causes this to happen:
>
> [<c002406c>] (asm_do_IRQ+0x6c/0x8c) from [<c0024b84>]
> (__irq_svc+0x44/0xcc)
> Exception stack(0xc3897c78 to 0xc3897cc0)
> 7c60:                                                       4022d320 4022e000
> 7c80: 08000075 00001000 c32273c0 c03ce1c0 c2b49b78 4022d000 c2b420b4 00000001
> 7ca0: 00000000 c3897cfc 00000000 c3897cc0 c00afc54 c002edd8 00000013 ffffffff
>
> Where that stack dump represents the pt_regs for the exception which
> happened.  Any function found in while unwinding will cause this to
> be printed.
>
> If you insert a C function between the IRQ assembly and asm_do_IRQ,
> the
> dump you get from asm_do_IRQ will be the stack for your function,
> not
> the pt_regs.  That makes the feature useless.
>

When __irq_svc - or any of the other exception handling assembly code -
calls the C code, the stack pointer will be pointing at the pt_regs
structure.

All the entry points into C code from the exception handling code are
marked with __exception or __exception_irq_enter to indicate that they
are one of the functions which has pt_regs above them.

Normally, when you've entered asm_do_IRQ() you will have this stack
layout (higher address towards top):

       pt_regs
       asm_do_IRQ frame

If you insert a C function between the exception assembly code and
asm_do_IRQ, you end up with this stack layout instead:

       pt_regs
       your function frame
       asm_do_IRQ frame

This means when we unwind, we'll get to asm_do_IRQ, and rather than
dumping out the pt_regs, we'll dump out your functions stack frame
instead, because that's what is above the asm_do_IRQ stack frame
rather than the expected pt_regs structure.

The fix is to introduce handle_IRQ() for no exception stack dump, so
it can be called with MULTI_IRQ_HANDLER is selected and a C function
is between the assembly code and the actual IRQ handling code.
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarEric Miao <eric.y.miao@gmail.com>
      a4841e39
  3. 04 Jul, 2011 7 commits
  5. 03 Jul, 2011 28 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7