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Author SHA1 Message Date
Peter Zijlstra 46db36abc3 x86/entry: Rename ___preempt_schedule 
Because moar '_' isn't always moar readable.

git grep -l "___preempt_schedule\(_notrace\)*" | while read file;
do
	sed -ie 's/___preempt_schedule\(_notrace\)*/preempt_schedule\1_thunk/g' $file;
done

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/20200320115858.995685950@infradead.org
 2020-03-21 16:03:53 +01:00
Brian Gerst ffd75b373f x86: Remove unneeded includes 
Clean up includes of and in <asm/syscalls.h>

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-19-brgerst@gmail.com
 2020-03-21 16:03:25 +01:00
Brian Gerst 0f78ff1711 x86/entry: Drop asmlinkage from syscalls 
asmlinkage is no longer required since the syscall ABI is now fully under
x86 architecture control.  This makes the 32-bit native syscalls a bit more
effecient by passing in regs via EAX instead of on the stack.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-18-brgerst@gmail.com
 2020-03-21 16:03:25 +01:00
Brian Gerst 25c619e59b x86/entry/32: Enable pt_regs based syscalls 
Enable pt_regs based syscalls for 32-bit.  This makes the 32-bit native
kernel consistent with the 64-bit kernel, and improves the syscall
interface by not needing to push all 6 potential arguments onto the stack.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-17-brgerst@gmail.com
 2020-03-21 16:03:24 +01:00
Brian Gerst 121b32a58a x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments 
For the 32-bit syscall interface, 64-bit arguments (loff_t) are passed via
a pair of 32-bit registers.  These register pairs end up in consecutive stack
slots, which matches the C ABI for 64-bit arguments.  But when accessing the
registers directly from pt_regs, the wrapper needs to manually reassemble the
64-bit value.  These wrappers already exist for 32-bit compat, so make them
available to 32-bit native in preparation for enabling pt_regs-based syscalls.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-16-brgerst@gmail.com
 2020-03-21 16:03:24 +01:00
Brian Gerst 866128a996 x86/entry/32: Rename 32-bit specific syscalls 
Rename the syscalls that only exist for 32-bit from x86_* to ia32_* to make it
clear they are for 32-bit only.  Also rename the functions to match the syscall
name.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-15-brgerst@gmail.com
 2020-03-21 16:03:23 +01:00
Brian Gerst a845a6cf1d x86/entry/32: Clean up syscall_32.tbl 
After removal of the __ia32_ prefix, remove compat entries that are now
identical to the native entry.

Converted with this script and fixing up whitespace:

while read nr abi name entry compat; do
    if [ "${nr:0:1}" = "#" ]; then
        echo $nr $abi $name $entry $compat
        continue
    fi
    if [ "$entry" = "$compat" ]; then
        compat=""
    fi
    echo "$nr	$abi	$name		$entry		$compat"
done

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-14-brgerst@gmail.com
 2020-03-21 16:03:23 +01:00
Brian Gerst cab56d3484 x86/entry: Remove ABI prefixes from functions in syscall tables 
Move the ABI prefixes to the __SYSCALL_[abi]() macros.  This allows removal
of the need to strip the prefix for UML.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-13-brgerst@gmail.com
 2020-03-21 16:03:23 +01:00
Brian Gerst 8210efcb15 x86/entry/64: Add __SYSCALL_COMMON() 
Add a __SYSCALL_COMMON() macro to the syscall table, which simplifies syscalltbl.sh.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-12-brgerst@gmail.com
 2020-03-21 16:03:22 +01:00
Brian Gerst b5592e5c0d x86/entry: Remove syscall qualifier support 
Syscall qualifier support is no longer needed.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-11-brgerst@gmail.com
 2020-03-21 16:03:22 +01:00
Brian Gerst d3b1b776ee x86/entry/64: Remove ptregs qualifier from syscall table 
Now that the fast syscall path is removed, the ptregs qualifier is unused.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-10-brgerst@gmail.com
 2020-03-21 16:03:21 +01:00
Brian Gerst 0872098804 x86/entry: Move max syscall number calculation to syscallhdr.sh 
Instead of using an array in asm-offsets to calculate the max syscall
number, calculate it when writing out the syscall headers.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-9-brgerst@gmail.com
 2020-03-21 16:03:21 +01:00
Brian Gerst 2e487c3579 x86/entry/64: Split X32 syscall table into its own file 
Since X32 has its own syscall table now, move it to a separate file.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-8-brgerst@gmail.com
 2020-03-21 16:03:21 +01:00
Brian Gerst cc42c045af x86/entry/64: Move sys_ni_syscall stub to common.c 
so it can be available to multiple syscall tables.  Also directly return
-ENOSYS instead of bouncing to the generic sys_ni_syscall().

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-7-brgerst@gmail.com
 2020-03-21 16:03:20 +01:00
Brian Gerst 27dd84fafc x86/entry/64: Use syscall wrappers for x32_rt_sigreturn 
Add missing syscall wrapper for x32_rt_sigreturn().

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-6-brgerst@gmail.com
 2020-03-21 16:03:20 +01:00
Brian Gerst a74d187c2d x86/entry: Refactor SYS_NI macros 
Pull the common code out from the SYS_NI macros into a new __SYS_NI macro.
Also conditionalize the X64 version in preparation for enabling syscall
wrappers on 32-bit native kernels.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-5-brgerst@gmail.com
 2020-03-21 16:03:20 +01:00
Brian Gerst 6cc8d2b286 x86/entry: Refactor COND_SYSCALL macros 
Pull the common code out from the COND_SYSCALL macros into a new
__COND_SYSCALL macro.  Also conditionalize the X64 version in preparation
for enabling syscall wrappers on 32-bit native kernels.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-4-brgerst@gmail.com
 2020-03-21 16:03:19 +01:00
Brian Gerst d2b5de495e x86/entry: Refactor SYSCALL_DEFINE0 macros 
Pull the common code out from the SYSCALL_DEFINE0 macros into a new
__SYS_STUB0 macro.  Also conditionalize the X64 version in preparation for
enabling syscall wrappers on 32-bit native kernels.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-3-brgerst@gmail.com
 2020-03-21 16:03:19 +01:00
Brian Gerst 4399e0cf49 x86/entry: Refactor SYSCALL_DEFINEx macros 
Pull the common code out from the SYSCALL_DEFINEx macros into a new
__SYS_STUBx macro.  Also conditionalize the X64 version in preparation for
enabling syscall wrappers on 32-bit native kernels.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-2-brgerst@gmail.com
 2020-03-21 16:03:18 +01:00
Thomas Gleixner 810f80a61b x86/entry/64: Trace irqflags unconditionally as ON when returning to user space 
User space cannot disable interrupts any longer so trace return to user space
unconditionally as IRQS_ON.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/20200308222609.314596327@linutronix.de
 2020-03-10 13:56:32 +01:00
Thomas Gleixner 74a4882d72 x86/entry/32: Remove unused label restore_nocheck 
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/20200308222609.219366430@linutronix.de
 2020-03-10 13:56:32 +01:00
Thomas Gleixner e441a2ae0e x86/entry/32: Remove the 0/-1 distinction from exception entries 
Nothing cares about the -1 "mark as interrupt" in the errorcode of
exception entries. It's only used to fill the error code when a signal is
delivered, but this is already inconsistent vs. 64 bit as there all
exceptions which do not have an error code set it to 0. So if 32 bit
applications would care about this, then they would have noticed more than
a decade ago.

Just use 0 for all excpetions which do not have an errorcode consistently.

This does neither break /proc/$PID/syscall because this interface examines
the error code / syscall number which is on the stack and that is set to -1
(no syscall) in common_exception unconditionally for all exceptions. The
push in the entry stub is just there to fill the hardware error code slot
on the stack for consistency of the stack layout.

A transient observation of 0 is possible, but that's true for the other
exceptions which use 0 already as well and that interface is an unreliable
snapshot of dubious correctness anyway.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/87mu94m7ky.fsf@nanos.tec.linutronix.de
 2020-02-29 12:45:54 +01:00
Andy Lutomirski 65c668f5fa x86/traps: Stop using ist_enter/exit() in do_int3() 
#BP is not longer using IST and using ist_enter() and ist_exit() makes it
harder to change ist_enter() and ist_exit()'s behavior.  Instead open-code
the very small amount of required logic.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200225220217.150607679@linutronix.de
 2020-02-27 15:28:39 +01:00
Thomas Gleixner ac3607f92f x86/entry/entry_32: Route int3 through common_exception 
int3 is not using the common_exception path for purely historical reasons,
but there is no reason to keep it the only exception which is different.

Make it use common_exception so the upcoming changes to autogenerate the
entry stubs do not have to special case int3.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200225220217.042369808@linutronix.de
 2020-02-27 14:48:41 +01:00
Thomas Gleixner 17dbedb5da x86/irq: Remove useless return value from do_IRQ() 
Nothing is using it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200225220216.826870369@linutronix.de
 2020-02-27 14:48:40 +01:00