linux-toradex.git/arch/parisc/lib/lusercopy.S, branch v5.0

parisc: Fix and improve kernel stack unwinding

2018-08-13T07:54:17+00:00

This patchset fixes and improves stack unwinding a lot:
1. Show backward stack traces with up to 30 callsites
2. Add callinfo to ENTRY_CFI() such that every assembler function will get an
   entry in the unwind table
3. Use constants instead of numbers in call_on_stack()
4. Do not depend on CONFIG_KALLSYMS to generate backtraces.
5. Speed up backtrace generation

Make sure you have this patch to GNU as installed:
https://sourceware.org/ml/binutils/2018-07/msg00474.html
Without this patch, unwind info in the kernel is often wrong for various
functions.

Signed-off-by: Helge Deller

parisc: Inline trivial exception code in lusercopy.S

2017-05-10T15:46:12+00:00

Fold trivial exception handling for lclear_user() and lstrnlen_user()
into the main functions.

Signed-off-by: Helge Deller

parisc: fix bugs in pa_memcpy

2017-04-15T15:24:05+00:00

The patch 554bfeceb8a22d448cd986fc9efce25e833278a1 ("parisc: Fix access
fault handling in pa_memcpy()") reimplements the pa_memcpy function.
Unfortunatelly, it makes the kernel unbootable. The crash happens in the
function ide_complete_cmd where memcpy is called with the same source
and destination address.

This patch fixes a few bugs in pa_memcpy:

* When jumping to .Lcopy_loop_16 for the first time, don't skip the
  instruction "ldi 31,t0" (this bug made the kernel unbootable)
* Use the COND macro when comparing length, so that the comparison is
  64-bit (a theoretical issue, in case the length is greater than
  0xffffffff)
* Don't use the COND macro after the "extru" instruction (the PA-RISC
  specification says that the upper 32-bits of extru result are undefined,
  although they are set to zero in practice)
* Fix exception addresses in .Lcopy16_fault and .Lcopy8_fault
* Rename .Lcopy_loop_4 to .Lcopy_loop_8 (so that it is consistent with
  .Lcopy8_fault)

Cc:  # v4.9+
Fixes: 554bfeceb8a2 ("parisc: Fix access fault handling in pa_memcpy()")
Signed-off-by: Mikulas Patocka 
Signed-off-by: Helge Deller

parisc: Fix access fault handling in pa_memcpy()

2017-03-29T19:49:02+00:00

pa_memcpy() is the major memcpy implementation in the parisc kernel which is
used to do any kind of userspace/kernel memory copies.

Al Viro noticed various bugs in the implementation of pa_mempcy(), most notably
that in case of faults it may report back to have copied more bytes than it
actually did.

Fixing those bugs is quite hard in the C-implementation, because the compiler
is messing around with the registers and we are not guaranteed that specific
variables are always in the same processor registers. This makes proper fault
handling complicated.

This patch implements pa_memcpy() in assembler. That way we have correct fault
handling and adding a 64-bit copy routine was quite easy.

Runtime tested with 32- and 64bit kernels.

Reported-by: Al Viro 
Cc:  # v4.9+
Signed-off-by: John David Anglin 
Signed-off-by: Helge Deller

parisc: Add cfi_startproc and cfi_endproc to assembly code

2016-10-05T20:54:40+00:00

Add ENTRY_CFI() and ENDPROC_CFI() macros for dwarf debug info and
convert assembly users to new macros.

Signed-off-by: Helge Deller

parisc: provide macro to create exception table entries

2013-11-07T21:25:33+00:00

Provide a macro ASM_EXCEPTIONTABLE_ENTRY() to create exception table
entries and convert all open-coded places to use that macro.

This patch is a first step toward creating a exception table which only
holds 32bit pointers even on a 64bit kernel. That way in my own kernel
I was able to reduce the in-kernel exception table from 44kB to 22kB.

Signed-off-by: Helge Deller

[PARISC] update parisc to use generic strncpy_from_user()

2012-05-31T10:14:37+00:00

Signed-off-by: James Bottomley

Revert "parisc: fix trivial section name warnings"

2008-06-13T14:49:45+00:00

This reverts commit bd3bb8c15b9a80dbddfb7905b237a4a11a4725b4.

Signed-off-by: Kyle McMartin

parisc: fix trivial section name warnings

2008-05-15T14:38:54+00:00

This trivial patch fixes the following section warnings on PARISC:
> WARNING: vmlinux.o (.text.1): unexpected section name.
>The (.[number]+) following section name are ld generated and not expected.
> Did you forget to use "ax"/"aw" in a .S file?
> Note that for example  contains
> section definitions for use in .S files.

Signed-off-by: Helge Deller 
Signed-off-by: Kyle McMartin

[PARISC] add ASM_EXCEPTIONTABLE_ENTRY() macro

2007-02-17T06:16:26+00:00

- this macro unifies the code to add exception table entries
- additionally use ENTRY()/ENDPROC() at more places

Signed-off-by: Helge Deller 
Signed-off-by: Kyle McMartin