forked from Minki/linux
2991be7252
Drop TIF_USERSPACE and add addr_limit to the thread_info struct. Subsequently, use that for address checking in strnlen_user() to ward off bogus -EFAULTs. Make __strnlen_user() return 0 on exception, rather than -EFAULT. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
288 lines
6.5 KiB
C
288 lines
6.5 KiB
C
/*
|
|
* include/asm-sh/processor.h
|
|
*
|
|
* Copyright (C) 1999, 2000 Niibe Yutaka
|
|
* Copyright (C) 2002, 2003 Paul Mundt
|
|
*/
|
|
|
|
#ifndef __ASM_SH_PROCESSOR_H
|
|
#define __ASM_SH_PROCESSOR_H
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/page.h>
|
|
#include <asm/types.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter").
|
|
*/
|
|
#define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; })
|
|
|
|
/* Core Processor Version Register */
|
|
#define CCN_PVR 0xff000030
|
|
#define CCN_CVR 0xff000040
|
|
#define CCN_PRR 0xff000044
|
|
|
|
/*
|
|
* CPU type and hardware bug flags. Kept separately for each CPU.
|
|
*
|
|
* Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
|
|
* in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
|
|
* for parsing the subtype in get_cpu_subtype().
|
|
*/
|
|
enum cpu_type {
|
|
/* SH-2 types */
|
|
CPU_SH7604,
|
|
|
|
/* SH-3 types */
|
|
CPU_SH7705, CPU_SH7707, CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
|
|
CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300,
|
|
|
|
/* SH-4 types */
|
|
CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
|
|
CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
|
|
CPU_SH73180, CPU_SH7770, CPU_SH7780, CPU_SH7781,
|
|
|
|
/* Unknown subtype */
|
|
CPU_SH_NONE
|
|
};
|
|
|
|
struct sh_cpuinfo {
|
|
enum cpu_type type;
|
|
unsigned long loops_per_jiffy;
|
|
|
|
struct cache_info icache;
|
|
struct cache_info dcache;
|
|
|
|
unsigned long flags;
|
|
};
|
|
|
|
extern struct sh_cpuinfo boot_cpu_data;
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern struct sh_cpuinfo cpu_data[];
|
|
#define current_cpu_data cpu_data[smp_processor_id()]
|
|
#else
|
|
#define cpu_data (&boot_cpu_data)
|
|
#define current_cpu_data boot_cpu_data
|
|
#endif
|
|
|
|
/*
|
|
* User space process size: 2GB.
|
|
*
|
|
* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
|
|
*/
|
|
#define TASK_SIZE 0x7c000000UL
|
|
|
|
/* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's.
|
|
*/
|
|
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
|
|
|
|
/*
|
|
* Bit of SR register
|
|
*
|
|
* FD-bit:
|
|
* When it's set, it means the processor doesn't have right to use FPU,
|
|
* and it results exception when the floating operation is executed.
|
|
*
|
|
* IMASK-bit:
|
|
* Interrupt level mask
|
|
*/
|
|
#define SR_FD 0x00008000
|
|
#define SR_DSP 0x00001000
|
|
#define SR_IMASK 0x000000f0
|
|
|
|
/*
|
|
* FPU structure and data
|
|
*/
|
|
|
|
struct sh_fpu_hard_struct {
|
|
unsigned long fp_regs[16];
|
|
unsigned long xfp_regs[16];
|
|
unsigned long fpscr;
|
|
unsigned long fpul;
|
|
|
|
long status; /* software status information */
|
|
};
|
|
|
|
/* Dummy fpu emulator */
|
|
struct sh_fpu_soft_struct {
|
|
unsigned long fp_regs[16];
|
|
unsigned long xfp_regs[16];
|
|
unsigned long fpscr;
|
|
unsigned long fpul;
|
|
|
|
unsigned char lookahead;
|
|
unsigned long entry_pc;
|
|
};
|
|
|
|
union sh_fpu_union {
|
|
struct sh_fpu_hard_struct hard;
|
|
struct sh_fpu_soft_struct soft;
|
|
};
|
|
|
|
/*
|
|
* Processor flags
|
|
*/
|
|
|
|
#define CPU_HAS_FPU 0x0001 /* Hardware FPU support */
|
|
#define CPU_HAS_P2_FLUSH_BUG 0x0002 /* Need to flush the cache in P2 area */
|
|
#define CPU_HAS_MMU_PAGE_ASSOC 0x0004 /* SH3: TLB way selection bit support */
|
|
#define CPU_HAS_DSP 0x0008 /* SH-DSP: DSP support */
|
|
#define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */
|
|
#define CPU_HAS_PTEA 0x0020 /* PTEA register */
|
|
|
|
struct thread_struct {
|
|
unsigned long sp;
|
|
unsigned long pc;
|
|
|
|
unsigned long trap_no, error_code;
|
|
unsigned long address;
|
|
/* Hardware debugging registers may come here */
|
|
unsigned long ubc_pc;
|
|
|
|
/* floating point info */
|
|
union sh_fpu_union fpu;
|
|
};
|
|
|
|
typedef struct {
|
|
unsigned long seg;
|
|
} mm_segment_t;
|
|
|
|
/* Count of active tasks with UBC settings */
|
|
extern int ubc_usercnt;
|
|
|
|
#define INIT_THREAD { \
|
|
sizeof(init_stack) + (long) &init_stack, /* sp */ \
|
|
0, /* pc */ \
|
|
0, 0, \
|
|
0, \
|
|
0, \
|
|
{{{0,}},} /* fpu state */ \
|
|
}
|
|
|
|
/*
|
|
* Do necessary setup to start up a newly executed thread.
|
|
*/
|
|
#define start_thread(regs, new_pc, new_sp) \
|
|
set_fs(USER_DS); \
|
|
regs->pr = 0; \
|
|
regs->sr = SR_FD; /* User mode. */ \
|
|
regs->pc = new_pc; \
|
|
regs->regs[15] = new_sp
|
|
|
|
/* Forward declaration, a strange C thing */
|
|
struct task_struct;
|
|
struct mm_struct;
|
|
|
|
/* Free all resources held by a thread. */
|
|
extern void release_thread(struct task_struct *);
|
|
|
|
/* Prepare to copy thread state - unlazy all lazy status */
|
|
#define prepare_to_copy(tsk) do { } while (0)
|
|
|
|
/*
|
|
* create a kernel thread without removing it from tasklists
|
|
*/
|
|
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
|
|
|
|
/* Copy and release all segment info associated with a VM */
|
|
#define copy_segments(p, mm) do { } while(0)
|
|
#define release_segments(mm) do { } while(0)
|
|
|
|
/*
|
|
* FPU lazy state save handling.
|
|
*/
|
|
|
|
static __inline__ void disable_fpu(void)
|
|
{
|
|
unsigned long __dummy;
|
|
|
|
/* Set FD flag in SR */
|
|
__asm__ __volatile__("stc sr, %0\n\t"
|
|
"or %1, %0\n\t"
|
|
"ldc %0, sr"
|
|
: "=&r" (__dummy)
|
|
: "r" (SR_FD));
|
|
}
|
|
|
|
static __inline__ void enable_fpu(void)
|
|
{
|
|
unsigned long __dummy;
|
|
|
|
/* Clear out FD flag in SR */
|
|
__asm__ __volatile__("stc sr, %0\n\t"
|
|
"and %1, %0\n\t"
|
|
"ldc %0, sr"
|
|
: "=&r" (__dummy)
|
|
: "r" (~SR_FD));
|
|
}
|
|
|
|
static __inline__ void release_fpu(struct pt_regs *regs)
|
|
{
|
|
regs->sr |= SR_FD;
|
|
}
|
|
|
|
static __inline__ void grab_fpu(struct pt_regs *regs)
|
|
{
|
|
regs->sr &= ~SR_FD;
|
|
}
|
|
|
|
#ifdef CONFIG_CPU_SH4
|
|
extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
|
|
#else
|
|
#define save_fpu(tsk) do { } while (0)
|
|
#endif
|
|
|
|
#define unlazy_fpu(tsk, regs) do { \
|
|
if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
|
|
save_fpu(tsk, regs); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define clear_fpu(tsk, regs) do { \
|
|
if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
|
|
clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
|
|
release_fpu(regs); \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
|
|
#define FPSCR_INIT 0x00080000
|
|
|
|
#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
|
|
#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
#define thread_saved_pc(tsk) (tsk->thread.pc)
|
|
|
|
extern unsigned long get_wchan(struct task_struct *p);
|
|
|
|
#define KSTK_EIP(tsk) ((tsk)->thread.pc)
|
|
#define KSTK_ESP(tsk) ((tsk)->thread.sp)
|
|
|
|
#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
|
|
#define cpu_relax() barrier()
|
|
|
|
#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
|
|
defined(CONFIG_CPU_SH4)
|
|
#define PREFETCH_STRIDE L1_CACHE_BYTES
|
|
#define ARCH_HAS_PREFETCH
|
|
#define ARCH_HAS_PREFETCHW
|
|
static inline void prefetch(void *x)
|
|
{
|
|
__asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
|
|
}
|
|
|
|
#define prefetchw(x) prefetch(x)
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_PROCESSOR_H */
|