android_kernel_xiaomi_sm8350/arch/x86_64
Prasanna S.P d28c4393a7 [PATCH] x86: error_code is not safe for kprobes
This patch moves the entry.S:error_entry to .kprobes.text section,
since code marked unsafe for kprobes jumps directly to entry.S::error_entry,
that must be marked unsafe as well.
This patch also moves all the ".previous.text" asm directives to ".previous"
for kprobes section.

AK: Following a similar i386 patch from Chuck Ebbert
AK: Also merged Jeremy's fix in.

+From: Jeremy Fitzhardinge <jeremy@goop.org>

KPROBE_ENTRY does a .section .kprobes.text, and expects its users to
do a .previous at the end of the function.

Unfortunately, if any code within the function switches sections, for
example .fixup, then the .previous ends up putting all subsequent code
into .fixup.  Worse, any subsequent .fixup code gets intermingled with
the code its supposed to be fixing (which is also in .fixup).  It's
surprising this didn't cause more havok.

The fix is to use .pushsection/.popsection, so this stuff nests
properly.  A further cleanup would be to get rid of all
.section/.previous pairs, since they're inherently fragile.

+From: Chuck Ebbert <76306.1226@compuserve.com>

Because code marked unsafe for kprobes jumps directly to
entry.S::error_code, that must be marked unsafe as well.
The easiest way to do that is to move the page fault entry
point to just before error_code and let it inherit the same
section.

Also moved all the ".previous" asm directives for kprobes
sections to column 1 and removed ".text" from them.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>
2006-09-26 10:52:34 +02:00
..
boot [PATCH] x86: AUX_DEVICE_INFO is one byte long, use 'movb' 2006-09-26 10:52:30 +02:00
crypto [CRYPTO] api: Get rid of flags argument to setkey 2006-09-21 11:41:02 +10:00
ia32 [PATCH] Fix sparse warnings in compat aout code 2006-09-26 10:52:33 +02:00
kernel [PATCH] x86: error_code is not safe for kprobes 2006-09-26 10:52:34 +02:00
lib [PATCH] annotate arch/x86_64/lib/*.S 2006-09-26 10:52:32 +02:00
mm [PATCH] Add sparse annotations to quiet sparse in arch/x86_64/mm/fault.c 2006-09-26 10:52:33 +02:00
oprofile
pci Revert mmiocfg heuristics and blacklist changes 2006-09-19 08:15:22 -07:00
defconfig [PATCH] Update defconfig 2006-09-26 10:52:26 +02:00
Kconfig [PATCH] syscall class hookup for all normal targets 2006-09-12 03:04:40 -04:00
Kconfig.debug [PATCH] lockdep: irqtrace subsystem, x86_64 support 2006-07-03 15:27:03 -07:00
Makefile [PATCH] x86: Detect CFI support in the assembler at runtime 2006-09-26 10:52:30 +02:00