include/asm-sparc/processor.h

   1 /* $Id: processor.h,v 1.77 2000/01/21 11:39:17 jj Exp $
   2  * include/asm-sparc/processor.h
   3  *
   4  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #ifndef __ASM_SPARC_PROCESSOR_H
   8 #define __ASM_SPARC_PROCESSOR_H
   9
  10 /*
  11  * Sparc32 implementation of macro that returns current
  12  * instruction pointer ("program counter").
  13  */
  14 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
  15
  16 #include <linux/a.out.h>
  17
  18 #include <asm/psr.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/head.h>
  21 #include <asm/signal.h>
  22 #include <asm/segment.h>
  23 #include <asm/btfixup.h>
  24 #include <asm/page.h>
  25 #include <asm/atomic.h>
  26
  27 /*
  28  * Bus types
  29  */
  30 #define EISA_bus 0
  31 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
  32 #define MCA_bus 0
  33 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  34
  35 /*
  36  * The sparc has no problems with write protection
  37  */
  38 #define wp_works_ok 1
  39 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  40
  41 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  42  * That one page is used to protect kernel from intruders, so that
  43  * we can make our access_ok test faster
  44  */
  45 #define TASK_SIZE       PAGE_OFFSET
  46
  47 struct fpq {
  48         unsigned long *insn_addr;
  49         unsigned long insn;
  50 };
  51
  52 typedef struct {
  53         int seg;
  54 } mm_segment_t;
  55
  56 /* The Sparc processor specific thread struct. */
  57 struct thread_struct {
  58         unsigned long uwinmask __attribute__ ((aligned (8)));
  59         struct pt_regs *kregs;
  60
  61         /* Context switch saved kernel state. */
  62         unsigned long ksp __attribute__ ((aligned (8)));
  63         unsigned long kpc;
  64         unsigned long kpsr;
  65         unsigned long kwim;
  66
  67         /* Special child fork kpsr/kwim values. */
  68         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  69         unsigned long fork_kwim;
  70
  71         /* A place to store user windows and stack pointers
  72          * when the stack needs inspection.
  73          */
  74 #define NSWINS 8
  75         struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));
  76         unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));
  77         unsigned long w_saved;
  78
  79         /* Floating point regs */
  80         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  81         unsigned long   fsr;
  82         unsigned long   fpqdepth;
  83         struct fpq      fpqueue[16];
  84         unsigned long flags;
  85         mm_segment_t current_ds;
  86         struct exec core_exec;     /* just what it says. */
  87         int new_signal;
  88         atomic_t refcount;      /* used for sun4c only */
  89 };
  90
  91 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  92 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  93
  94 #define INIT_MMAP { &init_mm, (0), (0), \
  95                     NULL, __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
  96
  97 #define INIT_THREAD  { \
  98 /* uwinmask, kregs, ksp, kpc, kpsr, kwim */ \
  99    0,        0,     0,   0,   0,    0, \
 100 /* fork_kpsr, fork_kwim */ \
 101    0,         0, \
 102 /* reg_window */  \
 103 { { { 0, }, { 0, } }, }, \
 104 /* rwbuf_stkptrs */  \
 105 { 0, 0, 0, 0, 0, 0, 0, 0, }, \
 106 /* w_saved */ \
 107    0, \
 108 /* FPU regs */   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 109                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
 110 /* FPU status, FPU qdepth, FPU queue */ \
 111    0,          0,  { { 0, 0, }, }, \
 112 /* flags,              current_ds, */ \
 113    SPARC_FLAG_KTHREAD, KERNEL_DS, \
 114 /* core_exec */ \
 115 { 0, }, \
 116 /* new_signal */ \
 117   0, \
 118 }
 119
 120 /* Return saved PC of a blocked thread. */
 121 extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
 122 {
 123         return t->kpc;
 124 }
 125
 126 /* Do necessary setup to start up a newly executed thread. */
 127 extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
 128                                     unsigned long sp)
 129 {
 130         register unsigned long zero asm("g1");
 131
 132         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
 133         regs->pc = ((pc & (~3)) - 4);
 134         regs->npc = regs->pc + 4;
 135         regs->y = 0;
 136         zero = 0;
 137         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
 138                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
 139                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
 140                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 141                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 142                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 143                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 144                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 145                              "st\t%%g0, [%0 + %3 + 0x3c]"
 146                              : : "r" (regs), "r" (sp - REGWIN_SZ), "r" (zero),
 147                              "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])));
 148 }
 149
 150 /* Free all resources held by a thread. */
 151 #define release_thread(tsk)             do { } while(0)
 152 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 153
 154
 155 #define copy_segments(__tsk, __mm)              \
 156         if((__tsk) == current &&                \
 157            (__mm) != NULL)                      \
 158                 flush_user_windows()
 159 #define release_segments(mm)            do { } while (0)
 160 #define forget_segments()               do { } while (0)
 161
 162 #define get_wchan(__TSK) \
 163 ({      extern void scheduling_functions_start_here(void); \
 164         extern void scheduling_functions_end_here(void); \
 165         unsigned long pc, fp, bias = 0; \
 166         unsigned long task_base = (unsigned long) (__TSK); \
 167         unsigned long __ret = 0; \
 168         struct reg_window *rw; \
 169         int count = 0; \
 170         if (!(__TSK) || (__TSK) == current || \
 171             (__TSK)->state == TASK_RUNNING) \
 172                 goto __out; \
 173         fp = (__TSK)->thread.ksp + bias; \
 174         do { \
 175                 /* Bogus frame pointer? */ \
 176                 if (fp < (task_base + sizeof(struct task_struct)) || \
 177                     fp >= (task_base + (2 * PAGE_SIZE))) \
 178                         break; \
 179                 rw = (struct reg_window *) fp; \
 180                 pc = rw->ins[7]; \
 181                 if (pc < ((unsigned long) scheduling_functions_start_here) || \
 182                     pc >= ((unsigned long) scheduling_functions_end_here)) { \
 183                         __ret = pc; \
 184                         goto __out; \
 185                 } \
 186                 fp = rw->ins[6] + bias; \
 187         } while (++count < 16); \
 188 __out:  __ret; \
 189 })
 190
 191 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 192 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 193
 194 #ifdef __KERNEL__
 195 #define THREAD_SIZE (2*PAGE_SIZE)
 196
 197 extern struct task_struct *last_task_used_math;
 198
 199 /* Allocation and freeing of basic task resources. */
 200 BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void)
 201 BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *)
 202 BTFIXUPDEF_CALL(void, get_task_struct, struct task_struct *)
 203
 204 #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
 205 #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
 206 #define get_task_struct(tsk) BTFIXUP_CALL(get_task_struct)(tsk)
 207
 208 #define init_task       (init_task_union.task)
 209 #define init_stack      (init_task_union.stack)
 210
 211 #endif
 212
 213 #endif /* __ASM_SPARC_PROCESSOR_H */