/usr/include/xenomai/asm-arm/system.h is in libxenomai-dev 2.6.4+dfsg-1.
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) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.org>.
*
* ARM port
* Copyright (C) 2005 Stelian Pop
*
* 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_ARM_SYSTEM_H
#define _XENO_ASM_ARM_SYSTEM_H
#ifdef __KERNEL__
#include <linux/ptrace.h>
#include <asm-generic/xenomai/system.h>
#include <asm/xenomai/syscall.h>
#define XNARCH_THREAD_STACKSZ 4096
#define xnarch_stack_size(tcb) ((tcb)->stacksize)
#define xnarch_stack_base(tcb) ((tcb)->stackbase)
#define xnarch_stack_end(tcb) ((caddr_t)(tcb)->stackbase - (tcb)->stacksize)
#define xnarch_user_task(tcb) ((tcb)->user_task)
#define xnarch_user_pid(tcb) ((tcb)->user_task->pid)
struct xnthread;
struct task_struct;
typedef struct xnarchtcb { /* Per-thread arch-dependent block */
/* Kernel mode side */
#ifdef CONFIG_XENO_HW_FPU
rthal_fpenv_t fpuenv;
rthal_fpenv_t *fpup; /* Pointer to the FPU backup area */
struct task_struct *user_fpu_owner;
/* Pointer the the FPU owner in userspace:
- NULL for RT K threads,
- last_task_used_math for Linux US threads (only current or NULL when MP)
- current for RT US threads.
*/
unsigned is_root;
#define xnarch_fpu_ptr(tcb) ((tcb)->fpup)
#else /* !CONFIG_XENO_HW_FPU */
#define xnarch_fpu_ptr(tcb) NULL
#endif /* CONFIG_XENO_HW_FPU */
unsigned stacksize; /* Aligned size of stack (bytes) */
unsigned long *stackbase; /* Stack space */
/* User mode side */
struct task_struct *user_task; /* Shadowed user-space task */
struct task_struct *active_task; /* Active user-space task */
struct mm_struct *mm;
struct mm_struct *active_mm;
struct thread_info ti; /* Holds kernel-based thread info */
struct thread_info *tip; /* Pointer to the active thread info (ti or user->thread_info). */
#ifdef XNARCH_HAVE_MAYDAY
struct {
unsigned long pc;
unsigned long r0;
#ifdef CONFIG_XENO_ARM_EABI
unsigned long r7;
#endif
#ifdef CONFIG_ARM_THUMB
unsigned long psr;
#endif
} mayday;
#endif
/* Init block */
struct xnthread *self;
int imask;
const char *name;
void (*entry)(void *cookie);
void *cookie;
} xnarchtcb_t;
typedef struct xnarch_fltinfo {
unsigned exception;
struct pt_regs *regs;
} xnarch_fltinfo_t;
#define xnarch_fault_trap(fi) ((fi)->exception)
#define xnarch_fault_code(fi) (0)
#define xnarch_fault_pc(fi) ((fi)->regs->ARM_pc - (thumb_mode((fi)->regs) ? 2 : 4)) /* XXX ? */
#ifndef CONFIG_XENO_HW_FPU
/* It is normal on ARM for user-space support running with a kernel compiled
with FPU support to make FPU faults, even on the context of real-time threads
which do not otherwise use FPU, so we simply ignore these faults. */
#define xnarch_fault_fpu_p(fi) (0)
#else /* CONFIG_XENO_HW_FPU */
static inline int xnarch_fault_fpu_p(struct xnarch_fltinfo *fi)
{
/* This function does the same thing to decode the faulting instruct as
"call_fpe" in arch/arm/entry-armv.S */
static unsigned copro_to_exc[16] = {
IPIPE_TRAP_UNDEFINSTR,
/* FPE */
IPIPE_TRAP_FPU, IPIPE_TRAP_FPU,
IPIPE_TRAP_UNDEFINSTR,
#ifdef CONFIG_CRUNCH
IPIPE_TRAP_FPU, IPIPE_TRAP_FPU, IPIPE_TRAP_FPU,
#else /* !CONFIG_CRUNCH */
IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR,
#endif /* !CONFIG_CRUNCH */
IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR,
#ifdef CONFIG_VFP
IPIPE_TRAP_VFP, IPIPE_TRAP_VFP,
#else /* !CONFIG_VFP */
IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR,
#endif /* !CONFIG_VFP */
IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR,
IPIPE_TRAP_UNDEFINSTR, IPIPE_TRAP_UNDEFINSTR,
};
unsigned instr, exc, cp;
char *pc;
if (fi->exception == IPIPE_TRAP_FPU)
return 1;
#ifdef CONFIG_VFP
if (fi->exception == IPIPE_TRAP_VFP)
goto trap_vfp;
#endif
/* When an FPU fault occurs in user-mode, it will be properly resolved
before __ipipe_dispatch_event is called. */
if (fi->exception != IPIPE_TRAP_UNDEFINSTR || xnarch_fault_um(fi))
return 0;
pc = (char *) xnarch_fault_pc(fi);
if (unlikely(thumb_mode(fi->regs))) {
unsigned short thumbh, thumbl;
#if defined(CONFIG_ARM_THUMB) && __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_V7)
#if __LINUX_ARM_ARCH__ < 7
if (cpu_architecture() < CPU_ARCH_ARMv7)
#else
if (0)
#endif /* arch < 7 */
#endif /* thumb && arch >= 6 && cpu_v7 */
return 0;
thumbh = *(unsigned short *) pc;
thumbl = *((unsigned short *) pc + 1);
if ((thumbh & 0x0000f800) < 0x0000e800)
return 0;
instr = (thumbh << 16) | thumbl;
#ifdef CONFIG_NEON
if ((instr & 0xef000000) == 0xef000000
|| (instr & 0xff100000) == 0xf9000000)
goto trap_vfp;
#endif
} else {
instr = *(unsigned *) pc;
#ifdef CONFIG_NEON
if ((instr & 0xfe000000) == 0xf2000000
|| (instr & 0xff100000) == 0xf4000000)
goto trap_vfp;
#endif
}
if ((instr & 0x0c000000) != 0x0c000000)
return 0;
cp = (instr & 0x00000f00) >> 8;
#ifdef CONFIG_IWMMXT
/* We need something equivalent to _TIF_USING_IWMMXT for Xenomai kernel
threads */
if (cp <= 1) {
fi->exception = IPIPE_TRAP_FPU;
return 1;
}
#endif
exc = copro_to_exc[cp];
#ifdef CONFIG_VFP
if (exc == IPIPE_TRAP_VFP) {
trap_vfp:
/* If an exception is pending, the VFP fault is not really an
"FPU unavailable" fault, so we return undefinstr in that
case, the nucleus will let linux handle the fault. */
exc = rthal_vfp_fmrx(FPEXC);
if (exc & (FPEXC_EX|FPEXC_DEX)
|| ((exc & FPEXC_EN) && rthal_vfp_fmrx(FPSCR) & FPSCR_IXE))
exc = IPIPE_TRAP_UNDEFINSTR;
else
exc = IPIPE_TRAP_VFP;
}
#endif
fi->exception = exc;
return exc != IPIPE_TRAP_UNDEFINSTR;
}
#endif /* CONFIG_XENO_HW_FPU */
/* The following predicates are only usable over a regular Linux stack
context. */
#define xnarch_fault_pf_p(fi) ((fi)->exception == IPIPE_TRAP_ACCESS)
#define xnarch_fault_bp_p(fi) ((current->ptrace & PT_PTRACED) && \
((fi)->exception == IPIPE_TRAP_BREAK))
#define xnarch_fault_notify(fi) (!xnarch_fault_bp_p(fi))
#ifdef __cplusplus
extern "C" {
#endif
static inline void *xnarch_alloc_host_mem (u_long bytes)
{
if (bytes > 128*1024)
return vmalloc(bytes);
return kmalloc(bytes,GFP_KERNEL);
}
static inline void xnarch_free_host_mem (void *chunk, u_long bytes)
{
if (bytes > 128*1024)
vfree(chunk);
else
kfree(chunk);
}
static inline void *xnarch_alloc_stack_mem(u_long bytes)
{
return kmalloc(bytes, GFP_KERNEL);
}
static inline void xnarch_free_stack_mem(void *chunk, u_long bytes)
{
kfree(chunk);
}
#ifdef __cplusplus
}
#endif
#else /* !__KERNEL__ */
#include <nucleus/system.h>
#include <bits/local_lim.h>
#endif /* __KERNEL__ */
#endif /* !_XENO_ASM_ARM_SYSTEM_H */
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