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Sandipan Das b0490a04e7 powerpc/lib/sstep: Fix count leading zeros instructions 
According to the GCC documentation, the behaviour of __builtin_clz()
and __builtin_clzl() is undefined if the value of the input argument
is zero. Without handling this special case, these builtins have been
used for emulating the following instructions:
  * Count Leading Zeros Word (cntlzw[.])
  * Count Leading Zeros Doubleword (cntlzd[.])

This fixes the emulated behaviour of these instructions by adding an
additional check for this special case.

Fixes: 3cdfcbfd32 ("powerpc: Change analyse_instr so it doesn't modify *regs")
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
 		2017-10-10 20:16:32 +11:00
..
Makefile powerpc: Use instruction emulation infrastructure to handle alignment faults 2017-09-01 16:42:43 +10:00
alloc.c treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
checksum_32.S powerpc: EX_TABLE macro for exception tables 2016-11-14 11:11:51 +11:00
checksum_64.S powerpc/64: Use optimized checksum routines on little-endian 2017-01-25 13:34:18 +11:00
checksum_wrappers.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
code-patching.c powerpc/lib/code-patching: Use alternate map for patch_instruction() 2017-07-03 23:12:19 +10:00
copy_32.S powerpc/32: remove a NOP from memset() 2017-09-01 16:42:46 +10:00
copypage_64.S powerpc/64: Fix naming of cache block vs. cache line 2017-02-06 19:46:04 +11:00
copypage_power7.S powerpc: Fix invalid use of register expressions 2017-08-10 22:29:41 +10:00
copyuser_64.S powerpc: get rid of zeroing, switch to RAW_COPY_USER 2017-04-06 15:08:42 -04:00
copyuser_power7.S powerpc: Fix invalid use of register expressions 2017-08-10 22:29:41 +10:00
crtsavres.S powerpc/64: Do not create new section for save/restore functions 2017-05-30 14:59:51 +10:00
div64.S
…
feature-fixups-test.S
…
feature-fixups.c powerpc: make feature-fixup tests fortify-safe 2017-07-12 16:26:03 -07:00
hweight_64.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
ldstfp.S powerpc: Fix kernel crash in emulation of vector loads and stores 2017-09-04 19:38:07 +10:00
locks.c powerpc/spinlock: Fix spin_unlock_wait() 2016-06-14 16:05:44 +10:00
mem_64.S powerpc/string: Implement optimized memset variants 2017-08-17 23:04:35 +10:00
memcmp_64.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
memcpy_64.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
memcpy_power7.S powerpc: Fix invalid use of register expressions 2017-08-10 22:29:41 +10:00
quad.S powerpc: Handle most loads and stores in instruction emulation code 2017-09-01 16:39:48 +10:00
rheap.c powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
sstep.c powerpc/lib/sstep: Fix count leading zeros instructions 2017-10-10 20:16:32 +11:00
string.S powerpc: EX_TABLE macro for exception tables 2016-11-14 11:11:51 +11:00
string_64.S powerpc: Fix invalid use of register expressions 2017-08-10 22:29:41 +10:00
test_emulate_step.c powerpc: emulate_step() tests for load/store instructions 2017-03-03 11:24:50 +11:00
vmx-helper.c powerpc: Introduce asm-prototypes.h 2016-06-16 22:39:54 +10:00
xor_vmx.c powerpc/lib/xor_vmx: Ensure no altivec code executes before enable_kernel_altivec() 2017-06-02 20:17:52 +10:00
xor_vmx.h powerpc/lib/xor_vmx: Ensure no altivec code executes before enable_kernel_altivec() 2017-06-02 20:17:52 +10:00
xor_vmx_glue.c powerpc/lib/xor_vmx: Ensure no altivec code executes before enable_kernel_altivec() 2017-06-02 20:17:52 +10:00