Helge Deller 71a71fb537 parisc: Fix syscall restarts ... On parisc syscalls which are interrupted by signals sometimes failed to restart and instead returned -ENOSYS which in the worst case lead to userspace crashes. A similiar problem existed on MIPS and was fixed by commit e967ef02 ("MIPS: Fix restart of indirect syscalls"). On parisc the current syscall restart code assumes that all syscall callers load the syscall number in the delay slot of the ble instruction. That's how it is e.g. done in the unistd.h header file: ble 0x100(%sr2, %r0) ldi #syscall_nr, %r20 Because of that assumption the current code never restored %r20 before returning to userspace. This assumption is at least not true for code which uses the glibc syscall() function, which instead uses this syntax: ble 0x100(%sr2, %r0) copy regX, %r20 where regX depend on how the compiler optimizes the code and register usage. This patch fixes this problem by adding code to analyze how the syscall number is loaded in the delay branch and - if needed - copy the syscall number to regX prior returning to userspace for the syscall restart. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>		2015-12-21 10:16:18 +01:00
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configs	rtmutex: Delete scriptable tester	2015-07-20 11:45:45 +02:00
include	parisc: Disable huge pages on Mako machines	2015-12-12 16:45:23 +01:00
kernel	parisc: Fix syscall restarts	2015-12-21 10:16:18 +01:00
lib	parisc: percpu: update comments referring to __get_cpu_var	2014-12-13 12:42:53 -08:00
math-emu	parisc: remove duplicate define	2013-11-07 22:28:15 +01:00
mm	Merge branch 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux	2015-11-22 12:50:58 -08:00
oprofile	oprofile: more whitespace fixes	2008-10-15 20:55:51 +02:00
defpalo.conf	parisc: switch to gzip-compressed vmlinuz kernel	2013-07-09 22:09:20 +02:00
install.sh	parisc: make "make install" not depend on vmlinux	2013-11-07 22:28:06 +01:00
Kconfig	parisc: Add Huge Page and HUGETLBFS support	2015-11-22 12:23:10 +01:00
Kconfig.debug	consolidate per-arch stack overflow debugging options	2013-07-04 11:25:39 -07:00
Makefile	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2015-02-19 10:07:08 -08:00
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