2008-07-22 00:04:13 +08:00
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/*
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* syscalls.h - Linux syscall interfaces (arch-specific)
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*
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2009-04-11 02:33:10 +08:00
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* Copyright (c) 2008 Jaswinder Singh Rajput
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2008-07-22 00:04:13 +08:00
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*
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* This file is released under the GPLv2.
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* See the file COPYING for more details.
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*/
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#ifndef _ASM_X86_SYSCALLS_H
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#define _ASM_X86_SYSCALLS_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <linux/signal.h>
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2009-04-11 02:33:10 +08:00
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#include <linux/types.h>
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2008-07-22 00:04:13 +08:00
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/* Common in X86_32 and X86_64 */
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/* kernel/ioport.c */
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2018-03-11 18:34:38 +08:00
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long ksys_ioperm(unsigned long from, unsigned long num, int turn_on);
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syscalls/x86: Use 'struct pt_regs' based syscall calling convention for 64-bit syscalls
Let's make use of ARCH_HAS_SYSCALL_WRAPPER=y on pure 64-bit x86-64 systems:
Each syscall defines a stub which takes struct pt_regs as its only
argument. It decodes just those parameters it needs, e.g:
asmlinkage long sys_xyzzy(const struct pt_regs *regs)
{
return SyS_xyzzy(regs->di, regs->si, regs->dx);
}
This approach avoids leaking random user-provided register content down
the call chain.
For example, for sys_recv() which is a 4-parameter syscall, the assembly
now is (in slightly reordered fashion):
<sys_recv>:
callq <__fentry__>
/* decode regs->di, ->si, ->dx and ->r10 */
mov 0x70(%rdi),%rdi
mov 0x68(%rdi),%rsi
mov 0x60(%rdi),%rdx
mov 0x38(%rdi),%rcx
[ SyS_recv() is automatically inlined by the compiler,
as it is not [yet] used anywhere else ]
/* clear %r9 and %r8, the 5th and 6th args */
xor %r9d,%r9d
xor %r8d,%r8d
/* do the actual work */
callq __sys_recvfrom
/* cleanup and return */
cltq
retq
The only valid place in an x86-64 kernel which rightfully calls
a syscall function on its own -- vsyscall -- needs to be modified
to pass struct pt_regs onwards as well.
To keep the syscall table generation working independent of
SYSCALL_PTREGS being enabled, the stubs are named the same as the
"original" syscall stubs, i.e. sys_*().
This patch is based on an original proof-of-concept
| From: Linus Torvalds <torvalds@linux-foundation.org>
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
and was split up and heavily modified by me, in particular to base it on
ARCH_HAS_SYSCALL_WRAPPER, to limit it to 64-bit-only for the time being,
and to update the vsyscall to the new calling convention.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
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: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180405095307.3730-4-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-04-05 17:53:02 +08:00
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2018-04-05 17:53:05 +08:00
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#ifdef CONFIG_X86_32
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/*
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* These definitions are only valid on pure 32-bit systems; x86-64 uses a
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* different syscall calling convention
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syscalls/x86: Use 'struct pt_regs' based syscall calling convention for 64-bit syscalls
Let's make use of ARCH_HAS_SYSCALL_WRAPPER=y on pure 64-bit x86-64 systems:
Each syscall defines a stub which takes struct pt_regs as its only
argument. It decodes just those parameters it needs, e.g:
asmlinkage long sys_xyzzy(const struct pt_regs *regs)
{
return SyS_xyzzy(regs->di, regs->si, regs->dx);
}
This approach avoids leaking random user-provided register content down
the call chain.
For example, for sys_recv() which is a 4-parameter syscall, the assembly
now is (in slightly reordered fashion):
<sys_recv>:
callq <__fentry__>
/* decode regs->di, ->si, ->dx and ->r10 */
mov 0x70(%rdi),%rdi
mov 0x68(%rdi),%rsi
mov 0x60(%rdi),%rdx
mov 0x38(%rdi),%rcx
[ SyS_recv() is automatically inlined by the compiler,
as it is not [yet] used anywhere else ]
/* clear %r9 and %r8, the 5th and 6th args */
xor %r9d,%r9d
xor %r8d,%r8d
/* do the actual work */
callq __sys_recvfrom
/* cleanup and return */
cltq
retq
The only valid place in an x86-64 kernel which rightfully calls
a syscall function on its own -- vsyscall -- needs to be modified
to pass struct pt_regs onwards as well.
To keep the syscall table generation working independent of
SYSCALL_PTREGS being enabled, the stubs are named the same as the
"original" syscall stubs, i.e. sys_*().
This patch is based on an original proof-of-concept
| From: Linus Torvalds <torvalds@linux-foundation.org>
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
and was split up and heavily modified by me, in particular to base it on
ARCH_HAS_SYSCALL_WRAPPER, to limit it to 64-bit-only for the time being,
and to update the vsyscall to the new calling convention.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
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: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180405095307.3730-4-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-04-05 17:53:02 +08:00
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*/
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2008-07-22 00:04:13 +08:00
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asmlinkage long sys_ioperm(unsigned long, unsigned long, int);
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2012-11-20 11:00:52 +08:00
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asmlinkage long sys_iopl(unsigned int);
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2008-07-22 00:04:13 +08:00
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2008-12-16 00:56:30 +08:00
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/* kernel/ldt.c */
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2017-10-19 01:21:07 +08:00
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asmlinkage long sys_modify_ldt(int, void __user *, unsigned long);
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2008-12-16 00:56:30 +08:00
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2009-04-11 02:33:10 +08:00
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/* kernel/signal.c */
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2013-08-06 06:02:40 +08:00
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asmlinkage long sys_rt_sigreturn(void);
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2009-04-11 02:33:10 +08:00
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2008-12-18 01:48:52 +08:00
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/* kernel/tls.c */
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2013-01-22 04:25:54 +08:00
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asmlinkage long sys_set_thread_area(struct user_desc __user *);
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asmlinkage long sys_get_thread_area(struct user_desc __user *);
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2008-12-18 01:48:52 +08:00
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2008-07-22 00:04:13 +08:00
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/* X86_32 only */
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2009-04-11 02:33:10 +08:00
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/* kernel/signal.c */
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2018-03-22 15:29:36 +08:00
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asmlinkage long sys_sigreturn(void);
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2008-07-22 00:04:13 +08:00
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2008-07-23 20:01:02 +08:00
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/* kernel/vm86_32.c */
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2015-07-29 13:41:21 +08:00
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struct vm86_struct;
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2013-03-28 05:18:05 +08:00
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asmlinkage long sys_vm86old(struct vm86_struct __user *);
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asmlinkage long sys_vm86(unsigned long, unsigned long);
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2008-07-23 20:01:02 +08:00
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2008-07-22 00:04:13 +08:00
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#endif /* CONFIG_X86_32 */
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#endif /* _ASM_X86_SYSCALLS_H */
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