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* x86/syscalls: Add syscall entry qualifiersAndy Lutomirski2016-01-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | This will let us specify something like 'sys_xyz/foo' instead of 'sys_xyz' in the syscall table, where the 'foo' qualifier conveys some extra information to the C code. The intent is to allow things like sys_execve/ptregs to indicate that sys_execve() touches pt_regs. 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: Frederic Weisbecker <fweisbec@gmail.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/2de06e33dce62556b3ec662006fcb295504e296e.1454022279.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86/syscalls: Move compat syscall entry handling into syscalltbl.shAndy Lutomirski2016-01-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | Rather than duplicating the compat entry handling in all consumers of syscalls_BITS.h, handle it directly in syscalltbl.sh. Now we generate entries in syscalls_32.h like: __SYSCALL_I386(5, sys_open) __SYSCALL_I386(5, compat_sys_open) and all of its consumers implicitly get the right entry point. 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: Frederic Weisbecker <fweisbec@gmail.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/b7c2b501dc0e6e43050e916b95807c3e2e16e9bb.1454022279.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86/syscalls: Give sys_call_ptr_t a useful typeAndy Lutomirski2015-10-091-2/+2
| | | | | | | | | | | | | | | | | | | Syscalls are asmlinkage functions (on 32-bit kernels), take six args of type unsigned long, and return long. Note that uml could probably be slightly cleaned up on top of this patch. 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: 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: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/4d3ecc4a169388d47009175408b2961961744e6f.1444091585.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86/entry/syscalls: Move syscall table declarations into asm/syscalls.hAndy Lutomirski2015-10-091-2/+1
| | | | | | | | | | | | | | | | | | | The header was missing some compat declarations. Also make sys_call_ptr_t have a consistent type. 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: 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: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/3166aaff0fb43897998fcb6ef92991533f8c5c6c.1444091585.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86, um: actually mark system call tables readonlyDaniel Borkmann2015-01-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit a074335a370e ("x86, um: Mark system call tables readonly") was supposed to mark the sys_call_table in UML as RO by adding the const, but it doesn't have the desired effect as it's nevertheless being placed into the data section since __cacheline_aligned enforces sys_call_table being placed into .data..cacheline_aligned instead. We need to use the ____cacheline_aligned version instead to fix this issue. Before: $ nm -v arch/x86/um/sys_call_table_64.o | grep -1 "sys_call_table" U sys_writev 0000000000000000 D sys_call_table 0000000000000000 D syscall_table_size After: $ nm -v arch/x86/um/sys_call_table_64.o | grep -1 "sys_call_table" U sys_writev 0000000000000000 R sys_call_table 0000000000000000 D syscall_table_size Fixes: a074335a370e ("x86, um: Mark system call tables readonly") Cc: H. Peter Anvin <hpa@zytor.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: Richard Weinberger <richard@nod.at>
* x86: get rid of pt_regs argument in vm86/vm86oldAl Viro2013-02-031-3/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* x86: get rid of pt_regs argument of iopl(2)Al Viro2013-02-031-1/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* introduce generic sys_sigaltstack(), switch x86 and um to itAl Viro2012-12-191-1/+0
| | | | | | | Conditional on CONFIG_GENERIC_SIGALTSTACK; architectures that do not select it are completely unaffected Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* x86, um: switch to generic fork/vfork/cloneAl Viro2012-11-281-3/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* x86, um/x86: switch to generic sys_execve and kernel_execveAl Viro2012-09-301-1/+0
| | | | | | | | | 32bit wrapper is lost on that; 64bit one is *not*, since we need to arrange for full pt_regs on stack when we call sys_execve() and we need to load callee-saved ones from there afterwards. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* um: kill thread->forkingAl Viro2012-09-201-1/+1
| | | | | | | | | | we only use that to tell copy_thread() done by syscall from that done by kernel_thread(). However, it's easier to do simply by checking PF_KTHREAD in thread flags. Merge sys_clone() guts for 32bit and 64bit, while we are at it... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* x86, um: Correct syscall table type attributes breaking gcc 4.8Martin Pelikan2012-06-091-2/+2
| | | | | | | | | | | The latest GCC 4.8 does some more checking on type attributes that break the build for ARCH=um -> fill them in. Specifically, the "asmlinkage" attributes is now tested for consistency. Signed-off-by: Martin Pelikan <pelikan@storkhole.cz> Link: http://lkml.kernel.org/r/1339269731-10772-1-git-send-email-pelikan@storkhole.cz Acked-by: Richard Weinberger <richard@nod.at> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* x86, um: Fix typo in 32-bit system call modificationsH. Peter Anvin2011-12-091-1/+1
| | | | | | | | We override sys_iopl(), not stub_iopl(); the latter is a 64-bitism that doesn't apply to i386 in the first place. Reported-by: Richard Weinberger <richard@nod.at> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* x86, um: Mark system call tables readonlyH. Peter Anvin2011-12-051-1/+1
| | | | | | | | | | | | Mark the system call tables readonly, as they already are on native, and the 32-bit UM version was in the previous assembly version. The 32-bit version lost it due to copy and paste from the 64-bit version, which was missing the const. Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Link: http://lkml.kernel.org/r/tip-45db1c6176c8171d9ae6fa6d82e07d115a5950ca@git.kernel.org Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* x86, um: Use the same style generated syscall tables as nativeH. Peter Anvin2011-12-051-0/+55
Now when the native kernel uses a single style of generated system call table, follow suite for UML and implement the same style, all in C. This requires __NR_syscall_max and NR_syscalls to be generated; on native this is done in asm-headers.h but that file is common to all UML architectures; therefore put it in user-headers.h instead which already have accommodations for architecture-specific values. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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