https://github.com/torvalds/linux
Revision 1a73d9310e093fc3adffba4d0a67b9fab2ee3f63 authored by Paul Burton on 02 June 2017, 18:35:01 UTC, committed by Ralf Baechle on 15 June 2017, 09:47:42 UTC
The code handling the pop76 opcode (ie. bnezc & jialc instructions) in
__compute_return_epc_for_insn() needs to set the value of $31 in the
jialc case, which is encoded with rs = 0. However its check to
differentiate bnezc (rs != 0) from jialc (rs = 0) was unfortunately
backwards, meaning that if we emulate a bnezc instruction we clobber $31
& if we emulate a jialc instruction it actually behaves like a jic
instruction.
Fix this by inverting the check of rs to match the way the instructions
are actually encoded.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 28d6f93d201d ("MIPS: Emulate the new MIPS R6 BNEZC and JIALC instructions")
Cc: stable <stable@vger.kernel.org> # v4.0+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16178/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 698b851
Tip revision: 1a73d9310e093fc3adffba4d0a67b9fab2ee3f63 authored by Paul Burton on 02 June 2017, 18:35:01 UTC
MIPS: Fix bnezc/jialc return address calculation
MIPS: Fix bnezc/jialc return address calculation
Tip revision: 1a73d93
.gitignore
#
# NOTE! Don't add files that are generated in specific
# subdirectories here. Add them in the ".gitignore" file
# in that subdirectory instead.
#
# NOTE! Please use 'git ls-files -i --exclude-standard'
# command after changing this file, to see if there are
# any tracked files which get ignored after the change.
#
# Normal rules
#
.*
*.o
*.o.*
*.a
*.s
*.ko
*.so
*.so.dbg
*.mod.c
*.i
*.lst
*.symtypes
*.order
*.elf
*.bin
*.tar
*.gz
*.bz2
*.lzma
*.xz
*.lz4
*.lzo
*.patch
*.gcno
*.ll
modules.builtin
Module.symvers
*.dwo
*.su
*.c.[012]*.*
#
# Top-level generic files
#
/tags
/TAGS
/linux
/vmlinux
/vmlinux.32
/vmlinux-gdb.py
/vmlinuz
/System.map
/Module.markers
#
# Debian directory (make deb-pkg)
#
/debian/
#
# tar directory (make tar*-pkg)
#
/tar-install/
#
# git files that we don't want to ignore even if they are dot-files
#
!.gitignore
!.mailmap
!.cocciconfig
#
# Generated include files
#
include/config
include/generated
arch/*/include/generated
# stgit generated dirs
patches-*
# quilt's files
patches
series
# cscope files
cscope.*
ncscope.*
# gnu global files
GPATH
GRTAGS
GSYMS
GTAGS
# id-utils files
ID
*.orig
*~
\#*#
#
# Leavings from module signing
#
extra_certificates
signing_key.pem
signing_key.priv
signing_key.x509
x509.genkey
# Kconfig presets
all.config
# Kdevelop4
*.kdev4
Computing file changes ...
