/usr/include/xenomai/asm-x86/syscall.h is in libxenomai-dev 2.6.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2001,2002,2003,2007 Philippe Gerum <rpm@xenomai.org>.
*
* Xenomai is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* Xenomai is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Xenomai; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _XENO_ASM_X86_SYSCALL_H
#define _XENO_ASM_X86_SYSCALL_H
#include <asm-generic/xenomai/syscall.h>
#include <asm/xenomai/tsc.h>
#define __xn_mux_code(shifted_id,op) ((op << 24)|shifted_id|(__xn_sys_mux & 0x7fff))
#define __xn_mux_shifted_id(id) ((id << 16) & 0xff0000)
#ifdef __KERNEL__
#include <linux/errno.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/xenomai/wrappers.h>
/* Register mapping for accessing syscall args. */
#define __xn_reg_mux(regs) ((regs)->x86reg_origax)
#define __xn_reg_rval(regs) ((regs)->x86reg_ax)
#ifdef __i386__
#define __xn_reg_arg1(regs) ((regs)->x86reg_bx)
#define __xn_reg_arg2(regs) ((regs)->x86reg_cx)
#define __xn_reg_arg3(regs) ((regs)->x86reg_dx)
#define __xn_reg_arg4(regs) ((regs)->x86reg_si)
#define __xn_reg_arg5(regs) ((regs)->x86reg_di)
#else /* x86_64 */
#define __xn_reg_arg1(regs) ((regs)->x86reg_di)
#define __xn_reg_arg2(regs) ((regs)->x86reg_si)
#define __xn_reg_arg3(regs) ((regs)->x86reg_dx)
#define __xn_reg_arg4(regs) ((regs)->r10) /* entry.S convention here. */
#define __xn_reg_arg5(regs) ((regs)->r8)
#endif /* x86_64 */
#define __xn_reg_mux_p(regs) ((__xn_reg_mux(regs) & 0x7fff) == __xn_sys_mux)
#define __xn_mux_id(regs) ((__xn_reg_mux(regs) >> 16) & 0xff)
#define __xn_mux_op(regs) ((__xn_reg_mux(regs) >> 24) & 0xff)
#define __xn_linux_mux_p(regs, nr) (__xn_reg_mux(regs) == (nr))
/* Purposedly used inlines and not macros for the following routines
so that we don't risk spurious side-effects on the value arg. */
static inline void __xn_success_return(struct pt_regs *regs, int v)
{
__xn_reg_rval(regs) = v;
}
static inline void __xn_error_return(struct pt_regs *regs, int v)
{
__xn_reg_rval(regs) = v;
}
static inline void __xn_status_return(struct pt_regs *regs, int v)
{
__xn_reg_rval(regs) = v;
}
static inline int __xn_interrupted_p(struct pt_regs *regs)
{
return __xn_reg_rval(regs) == -EINTR;
}
#else /* !__KERNEL__ */
/*
* Some of the following macros have been adapted from glibc's syscall
* mechanism implementation. They define an inline syscall mechanism used
* by Xenomai's real-time interfaces to invoke the skin module services
* in kernel space.
*/
#ifdef __i386__
#ifdef CONFIG_XENO_X86_SEP
/* This form relies on the kernel's vsyscall support in order to use
the SEP instructions which must be supported by the hardware. We
also depend on the NPTL providing us a pointer to the vsyscall DSO
entry point, to which we branch to instead of issuing a trap. */
#define DOSYSCALL "call *%%gs:0x10\n\t"
#else /* CONFIG_XENO_X86_SEP */
#define DOSYSCALL "int $0x80\n\t"
#endif /* CONFIG_XENO_X86_SEP */
/* The one that cannot fail. */
#define DOSYSCALLSAFE "int $0x80\n\t"
asm (".L__X'%ebx = 1\n\t"
".L__X'%ecx = 2\n\t"
".L__X'%edx = 2\n\t"
".L__X'%eax = 3\n\t"
".L__X'%esi = 3\n\t"
".L__X'%edi = 3\n\t"
".L__X'%ebp = 3\n\t"
".L__X'%esp = 3\n\t"
".macro bpushl name reg\n\t"
".if 1 - \\name\n\t"
".if 2 - \\name\n\t"
"pushl %ebx\n\t"
".else\n\t"
"xchgl \\reg, %ebx\n\t"
".endif\n\t"
".endif\n\t"
".endm\n\t"
".macro bpopl name reg\n\t"
".if 1 - \\name\n\t"
".if 2 - \\name\n\t"
"popl %ebx\n\t"
".else\n\t"
"xchgl \\reg, %ebx\n\t"
".endif\n\t"
".endif\n\t"
".endm\n\t"
".macro bmovl name reg\n\t"
".if 1 - \\name\n\t"
".if 2 - \\name\n\t"
"movl \\reg, %ebx\n\t"
".endif\n\t"
".endif\n\t"
".endm\n\t");
#define __xn_get_eip(dest) \
({ \
__label__ __here; \
__here: \
*dest = &&__here; \
})
static inline void __xn_get_ebp(void **dest)
{
asm volatile("movl %%ebp, %0": "=m"(*dest));
}
#define XENOMAI_SYS_MUX(nr, op, args...) \
({ \
unsigned __resultvar; \
asm volatile ( \
LOADARGS_##nr \
"movl %1, %%eax\n\t" \
DOSYSCALL \
RESTOREARGS_##nr \
: "=a" (__resultvar) \
: "i" (__xn_mux_code(0, op)) ASMFMT_##nr(args) \
: "memory", "cc"); \
(int) __resultvar; \
})
#define XENOMAI_SYS_MUX_SAFE(nr, op, args...) \
({ \
unsigned __resultvar; \
asm volatile ( \
LOADARGS_##nr \
"movl %1, %%eax\n\t" \
DOSYSCALLSAFE \
RESTOREARGS_##nr \
: "=a" (__resultvar) \
: "i" (__xn_mux_code(0, op)) ASMFMT_##nr(args) \
: "memory", "cc"); \
(int) __resultvar; \
})
#define XENOMAI_SKIN_MUX(nr, shifted_id, op, args...) \
({ \
int __muxcode = __xn_mux_code(shifted_id, op); \
unsigned __resultvar; \
asm volatile ( \
LOADARGS_##nr \
"movl %1, %%eax\n\t" \
DOSYSCALL \
RESTOREARGS_##nr \
: "=a" (__resultvar) \
: "m" (__muxcode) ASMFMT_##nr(args) \
: "memory", "cc"); \
(int) __resultvar; \
})
#define LOADARGS_0
#define LOADARGS_1 \
"bpushl .L__X'%k2, %k2\n\t" \
"bmovl .L__X'%k2, %k2\n\t"
#define LOADARGS_2 LOADARGS_1
#define LOADARGS_3 LOADARGS_1
#define LOADARGS_4 LOADARGS_1
#define LOADARGS_5 LOADARGS_1
#define RESTOREARGS_0
#define RESTOREARGS_1 \
"bpopl .L__X'%k2, %k2\n\t"
#define RESTOREARGS_2 RESTOREARGS_1
#define RESTOREARGS_3 RESTOREARGS_1
#define RESTOREARGS_4 RESTOREARGS_1
#define RESTOREARGS_5 RESTOREARGS_1
#define ASMFMT_0()
#define ASMFMT_1(arg1) \
, "acdSD" (arg1)
#define ASMFMT_2(arg1, arg2) \
, "adSD" (arg1), "c" (arg2)
#define ASMFMT_3(arg1, arg2, arg3) \
, "aSD" (arg1), "c" (arg2), "d" (arg3)
#define ASMFMT_4(arg1, arg2, arg3, arg4) \
, "aD" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)
#define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \
, "a" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
#define XENOMAI_SYSBIND(a1,a2,a3,a4) \
XENOMAI_SYS_MUX_SAFE(4,__xn_sys_bind,a1,a2,a3,a4)
#else /* x86_64 */
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
#define LOAD_ARGS_0() asm volatile ("" : /* */ : /* */ : "memory");
#else
#define LOAD_ARGS_0()
#endif
#define LOAD_REGS_0
#define ASM_ARGS_0
#define LOAD_ARGS_1(a1) \
long int __arg1 = (long) (a1); \
LOAD_ARGS_0()
#define LOAD_REGS_1 \
register long int _a1 asm ("rdi") = __arg1; \
LOAD_REGS_0
#define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1)
#define LOAD_ARGS_2(a1, a2) \
long int __arg2 = (long) (a2); \
LOAD_ARGS_1(a1)
#define LOAD_REGS_2 \
register long int _a2 asm ("rsi") = __arg2; \
LOAD_REGS_1
#define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2)
#define LOAD_ARGS_3(a1, a2, a3) \
long int __arg3 = (long) (a3); \
LOAD_ARGS_2 (a1, a2)
#define LOAD_REGS_3 \
register long int _a3 asm ("rdx") = __arg3; \
LOAD_REGS_2
#define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3)
#define LOAD_ARGS_4(a1, a2, a3, a4) \
long int __arg4 = (long) (a4); \
LOAD_ARGS_3 (a1, a2, a3)
#define LOAD_REGS_4 \
register long int _a4 asm ("r10") = __arg4; \
LOAD_REGS_3
#define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4)
#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
long int __arg5 = (long) (a5); \
LOAD_ARGS_4 (a1, a2, a3, a4)
#define LOAD_REGS_5 \
register long int _a5 asm ("r8") = __arg5; \
LOAD_REGS_4
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_a5)
#define DO_SYSCALL(name, nr, args...) \
({ \
unsigned long __resultvar; \
LOAD_ARGS_##nr(args) \
LOAD_REGS_##nr \
asm volatile ( \
"syscall\n\t" \
: "=a" (__resultvar) \
: "0" (name) ASM_ARGS_##nr \
: "memory", "cc", "r11", "cx"); \
(int) __resultvar; \
})
#define XENOMAI_SYS_MUX(nr, op, args...) \
DO_SYSCALL(__xn_mux_code(0,op), nr, args)
#define XENOMAI_SKIN_MUX(nr, shifted_id, op, args...) \
DO_SYSCALL(__xn_mux_code(shifted_id,op), nr, args)
#define XENOMAI_SYSBIND(a1,a2,a3,a4) \
XENOMAI_SYS_MUX(4,__xn_sys_bind,a1,a2,a3,a4)
#endif /* x86_64 */
#define XENOMAI_SYSCALL0(op) XENOMAI_SYS_MUX(0,op)
#define XENOMAI_SYSCALL1(op,a1) XENOMAI_SYS_MUX(1,op,a1)
#define XENOMAI_SYSCALL2(op,a1,a2) XENOMAI_SYS_MUX(2,op,a1,a2)
#define XENOMAI_SYSCALL3(op,a1,a2,a3) XENOMAI_SYS_MUX(3,op,a1,a2,a3)
#define XENOMAI_SYSCALL4(op,a1,a2,a3,a4) XENOMAI_SYS_MUX(4,op,a1,a2,a3,a4)
#define XENOMAI_SYSCALL5(op,a1,a2,a3,a4,a5) XENOMAI_SYS_MUX(5,op,a1,a2,a3,a4,a5)
#define XENOMAI_SKINCALL0(id,op) XENOMAI_SKIN_MUX(0,id,op)
#define XENOMAI_SKINCALL1(id,op,a1) XENOMAI_SKIN_MUX(1,id,op,a1)
#define XENOMAI_SKINCALL2(id,op,a1,a2) XENOMAI_SKIN_MUX(2,id,op,a1,a2)
#define XENOMAI_SKINCALL3(id,op,a1,a2,a3) XENOMAI_SKIN_MUX(3,id,op,a1,a2,a3)
#define XENOMAI_SKINCALL4(id,op,a1,a2,a3,a4) XENOMAI_SKIN_MUX(4,id,op,a1,a2,a3,a4)
#define XENOMAI_SKINCALL5(id,op,a1,a2,a3,a4,a5) XENOMAI_SKIN_MUX(5,id,op,a1,a2,a3,a4,a5)
#endif /* !__KERNEL__ */
#endif /* !_XENO_ASM_X86_SYSCALL_H */
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