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    • David S. Miller's avatar
      sparc: Stash orig_i0 into %g6 instead of %g2 · e88d2468
      David S. Miller authored 
      

As per the comments added by this commit, %g2 turns out to not be a
usable place to save away orig_i0 for syscall restart handling.

In fact all of %g2, %g3, %g4, and %g5 are assumed to be saved across
a system call by various bits of code in glibc.

%g1 can't be used because that holds the syscall number, which would
need to be saved and restored for syscall restart handling too, and
that would only compound our problems :-)

This leaves us with %g6 and %g7 which are for "system use".  %g7 is
used as the "thread register" by glibc, but %g6 is used as a compiler
and assembler temporary scratch register.  And in no instance is %g6
used to hold a value across a system call.

Therefore %g6 is safe for storing away orig_i0, at least for now.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e88d2468
    • Paul Bolle's avatar
      unicore32: drop unused Kconfig symbols · d159e571
      Paul Bolle authored 
      

Signed-off-by: default avatarPaul Bolle <pebolle@tiscali.nl>
Acked-by: default avatarGuan Xuetao <gxt@mprc.pku.edu.cn>
      d159e571
    • Arnaud Lacombe's avatar
      arch/unicore32: do not use EXTRA_AFLAGS or EXTRA_CFLAGS · 63c95fa4
      Arnaud Lacombe authored 
      

Usage of these flags has been deprecated for nearly 4 years by:

    commit f77bf014
    Author: Sam Ravnborg <sam@neptun.(none)>
    Date:   Mon Oct 15 22:25:06 2007 +0200

        kbuild: introduce ccflags-y, asflags-y and ldflags-y

Moreover, these flags (at least EXTRA_CFLAGS) have been documented for command
line use. By default, gmake(1) do not override command line setting, so this is
likely to result in build failure or unexpected behavior.

Replace their usage by Kbuild's `{as,cc,ld}flags-y'.

Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: default avatarArnaud Lacombe <lacombar@gmail.com>
Acked-by: default avatarGuan Xuetao <gxt@mprc.pku.edu.cn>
      63c95fa4
    • Guan Xuetao's avatar
      unicore32: fix build error for find bitops · e13b91c1
      Guan Xuetao authored 
      

Remove the __uc32_ prefix in find bitops functions.
Move find_* macros behind asm-generic/bitops.h inclusion.
see commit <19de85ef>
  bitops: add #ifndef for each of find bitops
also see commit <63e424c8>
  arch: remove CONFIG_GENERIC_FIND_{NEXT_BIT,BIT_LE,LAST_BIT}

Signed-off-by: default avatarGuan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
      e13b91c1
    • David S. Miller's avatar
      sparc: Fix handling of orig_i0 wrt. debugging when restarting syscalls. · 1d299bc7
      David S. Miller authored 
      

Although we provide a proper way for a debugger to control whether
syscall restart occurs, we run into problems because orig_i0 is not
saved and restored properly.

Luckily we can solve this problem without having to make debuggers
aware of the issue.  Across system calls, several registers are
considered volatile and can be safely clobbered.

Therefore we use the pt_regs save area of one of those registers, %g2,
as a place to save and restore orig_i0.

Debuggers transparently will do the right thing because they save and
restore this register already.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1d299bc7