8c84014f3b
x86/entry: Remove exception_enter() from most trap handlers
...
On 64-bit kernels, we don't need it any more: we handle context
tracking directly on entry from user mode and exit to user mode.
On 32-bit kernels, we don't support context tracking at all, so
these callbacks had no effect.
Note: this doesn't change do_page_fault(). Before we do that,
we need to make sure that there is no code that can page fault
from kernel mode with CONTEXT_USER. The 32-bit fast system call
stack argument code is the only offender I'm aware of right now.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/ae22f4dfebd799c916574089964592be218151f9.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:09 +02:00
02bc7768fe
x86/asm/entry/64: Migrate error and IRQ exit work to C and remove old assembly code
...
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/60e90901eee611e59e958bfdbbe39969b4f88fe5.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:08 +02:00
a586f98e97
x86/asm/entry/64: Simplify IRQ stack pt_regs handling
...
There's no need for both RSI and RDI to point to the original stack.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/3a0481f809dd340c7d3f54ce3fd6d66ef2a578cd.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:08 +02:00
ff467594f2
x86/asm/entry/64: Save all regs on interrupt entry
...
To prepare for the big rewrite of the error and interrupt exit
paths, we will need pt_regs completely filled in.
It's already completely filled in when error_exit runs, so rearrange
interrupt handling to match it. This will slow down interrupt
handling very slightly (eight instructions), but the
simplification it enables will be more than worth it.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/d8a766a7f558b30e6e01352854628a2d9943460c.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:07 +02:00
29ea1b258b
x86/entry/64: Migrate 64-bit and compat syscalls to the new exit handlers and remove old assembly code
...
These need to be migrated together, as the compat case used to
jump into the middle of the 64-bit exit code.
Remove the old assembly code.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/d4d1d70de08ac3640badf50048a9e8f18fe2497f.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:07 +02:00
cb6f64ed5a
x86/entry/64: Really create an error-entry-from-usermode code path
...
In 539f511365luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/91e17891e49fa3d61357eadc451529ad48143ee1.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:07 +02:00
c5c46f59e4
x86/entry: Add new, comprehensible entry and exit handlers written in C
...
The current x86 entry and exit code, written in a mixture of assembly and
C code, is incomprehensible due to being open-coded in a lot of places
without coherent documentation.
It appears to work primary by luck and duct tape: i.e. obvious runtime
failures were fixed on-demand, without re-thinking the design.
Due to those reasons our confidence level in that code is low, and it is
very difficult to incrementally improve.
Add new code written in C, in preparation for simply deleting the old
entry code.
prepare_exit_to_usermode() is a new function that will handle all
slow path exits to user mode. It is called with IRQs disabled
and it leaves us in a state in which it is safe to immediately
return to user mode. IRQs must not be re-enabled at any point
after prepare_exit_to_usermode() returns and user mode is actually
entered. (We can, of course, fail to enter user mode and treat
that failure as a fresh entry to kernel mode.)
All callers of do_notify_resume() will be migrated to call
prepare_exit_to_usermode() instead; prepare_exit_to_usermode() needs
to do everything that do_notify_resume() does today, but it also
takes care of scheduling and context tracking. Unlike
do_notify_resume(), it does not need to be called in a loop.
syscall_return_slowpath() is exactly what it sounds like: it will
be called on any syscall exit slow path. It will replace
syscall_trace_leave() and it calls prepare_exit_to_usermode() on the
way out.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/c57c8b87661a4152801d7d3786eac2d1a2f209dd.1435952415.git.luto@kernel.org
[ Improved the changelog a bit. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:06 +02:00
feed36cde0
x86/entry: Add enter_from_user_mode() and use it in syscalls
...
Changing the x86 context tracking hooks is dangerous because
there are no good checks that we track our context correctly.
Add a helper to check that we're actually in CONTEXT_USER when
we enter from user mode and wire it up for syscall entries.
Subsequent patches will wire this up for all non-NMI entries as
well. NMIs are their own special beast and cannot currently
switch overall context tracking state. Instead, they have their
own special RCU hooks.
This is a tiny speedup if !CONFIG_CONTEXT_TRACKING (removes a
branch) and a tiny slowdown if CONFIG_CONTEXT_TRACING (adds a
layer of indirection). Eventually, we should fix up the core
context tracking code to supply a function that does what we
want (and can be much simpler than user_exit), which will enable
us to get rid of the extra call.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/853b42420066ec3fb856779cdc223a6dcb5d355b.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:06 +02:00
02fdcd5eac
x86/traps, context_tracking: Assert that we're in CONTEXT_KERNEL in exception entries
...
Other than the super-atomic exception entries, all exception
entries are supposed to switch our context tracking state to
CONTEXT_KERNEL. Assert that they do. These assertions appear
trivial at this point, as exception_enter() is the function
responsible for switching context, but I'm planning on reworking
x86's exception context tracking, and these assertions will help
make sure that all of this code keeps working.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/20fa1ee2d943233a184aaf96ff75394d3b34dfba.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:05 +02:00
1f484aa690
x86/entry: Move C entry and exit code to arch/x86/entry/common.c
...
The entry and exit C helpers were confusingly scattered between
ptrace.c and signal.c, even though they aren't specific to
ptrace or signal handling. Move them together in a new file.
This change just moves code around. It doesn't change anything.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/324d686821266544d8572423cc281f961da445f4.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:59:05 +02:00
5e99cb7c35
x86/entry/64/compat: Fix bad fast syscall arg failure path
...
If user code does SYSCALL32 or SYSENTER without a valid stack,
then our attempt to determine the syscall args will result in a
failed uaccess fault. Previously, we would try to recover by
jumping to the syscall exit code, but we'd run the syscall exit
work even though we never made it to the syscall entry work.
Clean it up by treating the failure path as a non-syscall entry
and exit pair.
This fixes strace's output when running the syscall_arg_fault
test. Without this fix, strace would get out of sync and would
fail to associate syscall entries with syscall exits.
Signed-off-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Denys Vlasenko <vda.linux@googlemail.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Rik van Riel <riel@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/903010762c07a3d67df914fea2da84b52b0f8f1d.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-07 10:58:30 +02:00
827a82ff39
x86/earlyprintk: Allow early_printk() to use console style parameters like '115200n8'
...
When I enable early_printk on a kernel, I cut and paste the
console= input and add to earlyprintk parameter. But I notice
recently that ktest has not been detecting triple faults. The
way it detects it, is by seeing the kernel banner "Linux version
.." with a different kernel version pop up. Then I noticed that
early printk was no longer working on my console, which was why
ktest was not seeing it.
I bisected it down and it was added to 4.0 with this commit:
ea9e9d8029ea9e9d8029rostedt@goodmis.org >
Cc: Alan Cox <alan@linux.intel.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: David Cohen <david.a.cohen@linux.intel.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Stuart R. Anderson <stuart.r.anderson@intel.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/20150706101434.5f6a351b@gandalf.local.home
[ Cleaned it up a bit. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 17:33:47 +02:00
9b54050bfe
x86/compat: Separate ia32 and x32 compat ABIs
...
The x32 ABI is now independent of the ia32 compat ABI. Common
code is now conditional on CONFIG_COMPAT, but unshared code like
syscall entry, signal handling, and the VDSO are under separate
config options.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-13-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:58 +02:00
0c3619ea67
x86/compat: Clean up HAVE_UID16 config
...
Merge the 32-bit compat config setting for HAVE_UID16 with the
32-bit native one.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-12-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:58 +02:00
3bead553ab
x86/compat: Define ARCH_WANT_OLD_COMPAT_IPC only for 32-bit compat
...
x32 does not need CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-11-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:57 +02:00
5e2aad2460
x86/compat: Remove unneeded #include
...
Including sys_ia32.h is not needed in signal.c.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-10-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:57 +02:00
10ed34935e
x86/compat, x86/perf: Don't build perf_callchain_user32() on x32
...
perf_callchain_user32() is not needed for x32.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-9-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:57 +02:00
c338867d0e
x86/compat: Check for both 32-bit compat and x32 in get_gate_vma()
...
Change this to CONFIG_COMPAT so both 32-bit compat and x32 will
do the check.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Acked-by: Andy Lutomirski <luto@kernel.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-8-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:57 +02:00
ab8b82ee6d
x86/compat: Don't build the 32-bit VDSO if not needed
...
Build the 32-bit vdso only for native 32-bit or 32-bit compat is
enabled. x32 should not force it to build.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-7-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:56 +02:00
601275c3e0
x86/compat: Factor out ia32 compat code from compat_arch_ptrace()
...
Move the ia32-specific code in compat_arch_ptrace() into its
own function.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-6-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:56 +02:00
7da770785f
x86/compat: Rename 'start_thread_ia32' to 'compat_start_thread'
...
This function is shared between the 32-bit compat and x32 ABIs.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-5-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:56 +02:00
b829d1be20
x86/compat: Move ucontext_x32 to sigframe.h
...
ia32.h should only contain the code for 32-bit compatability.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-4-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:55 +02:00
b2e02b820d
x86/compat: Make mmap_is_ia32() common compat
...
TIF_ADDR32 is set for both ia32 and x32 tasks, so change from
CONFIG_IA32_EMULATION to CONFIG_COMPAT. Use config_enabled()
to make the function more readable.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-3-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:55 +02:00
c0bfd26e13
x86/compat: Move copy_siginfo_*_user32() to signal_compat.c
...
copy_siginfo_to_user32() and copy_siginfo_from_user32() are used
by both the 32-bit compat and x32 ABIs. Move them to
signal_compat.c.
Signed-off-by: Brian Gerst <brgerst@gmail.com >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/1434974121-32575-2-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:28:55 +02:00
5a33fcb8d9
x86/asm/tsc: Save an instruction in DECLARE_ARGS users
...
Before, the code to do RDTSC looked like:
rdtsc
shl $0x20, %rdx
mov %eax, %eax
or %rdx, %rax
The "mov %eax, %eax" is required to clear the high 32 bits of RAX.
By declaring low and high as 64-bit variables, the code is
simplified to:
rdtsc
shl $0x20,%rdx
or %rdx,%rax
Yes, it's a 2-byte instruction that's not on a critical path,
but there are principles to be upheld.
Every user of EAX_EDX_RET has been checked. I tried to check
users of EAX_EDX_ARGS, but there weren't any, so I deleted it to
be safe.
( There's no benefit to making "high" 64 bits, but it was the
simplest way to proceed. )
Signed-off-by: George Spelvin <linux@horizon.com >
Signed-off-by: Borislav Petkov <bp@suse.de >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: jacob.jun.pan@linux.intel.com
Link: http://lkml.kernel.org/r/20150618075906.4615.qmail@ns.horizon.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2015-07-06 15:23:30 +02:00
Andy Lutomirski
Steven Rostedt
Brian Gerst
George Spelvin