include/asm-sparc/processor.h

   1 /* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem 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/btfixup.h>
  23 #include <asm/page.h>
  24
  25 /*
  26  * The sparc has no problems with write protection
  27  */
  28 #define wp_works_ok 1
  29 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  30
  31 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  32  * That one page is used to protect kernel from intruders, so that
  33  * we can make our access_ok test faster
  34  */
  35 #define TASK_SIZE       PAGE_OFFSET
  36 #ifdef __KERNEL__
  37 #define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
  38 #define STACK_TOP_MAX   STACK_TOP
  39 #endif /* __KERNEL__ */
  40
  41 struct task_struct;
  42
  43 #ifdef __KERNEL__
  44 struct fpq {
  45         unsigned long *insn_addr;
  46         unsigned long insn;
  47 };
  48 #endif
  49
  50 typedef struct {
  51         int seg;
  52 } mm_segment_t;
  53
  54 /* The Sparc processor specific thread struct. */
  55 struct thread_struct {
  56         struct pt_regs *kregs;
  57         unsigned int _pad1;
  58
  59         /* Special child fork kpsr/kwim values. */
  60         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  61         unsigned long fork_kwim;
  62
  63         /* Floating point regs */
  64         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  65         unsigned long   fsr;
  66         unsigned long   fpqdepth;
  67         struct fpq      fpqueue[16];
  68         unsigned long flags;
  69         mm_segment_t current_ds;
  70         struct exec core_exec;     /* just what it says. */
  71         int new_signal;
  72 };
  73
  74 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  75 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  76
  77 #define INIT_THREAD  { \
  78         .flags = SPARC_FLAG_KTHREAD, \
  79         .current_ds = KERNEL_DS, \
  80 }
  81
  82 /* Return saved PC of a blocked thread. */
  83 extern unsigned long thread_saved_pc(struct task_struct *t);
  84
  85 /* Do necessary setup to start up a newly executed thread. */
  86 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  87                                     unsigned long sp)
  88 {
  89         register unsigned long zero asm("g1");
  90
  91         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  92         regs->pc = ((pc & (~3)) - 4);
  93         regs->npc = regs->pc + 4;
  94         regs->y = 0;
  95         zero = 0;
  96         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  97                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  98                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  99                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 100                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 101                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 102                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 103                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 104                              "st\t%%g0, [%0 + %3 + 0x3c]"
 105                              : /* no outputs */
 106                              : "r" (regs),
 107                                "r" (sp - sizeof(struct reg_window)),
 108                                "r" (zero),
 109                                "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
 110                              : "memory");
 111 }
 112
 113 /* Free all resources held by a thread. */
 114 #define release_thread(tsk)             do { } while(0)
 115 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 116
 117 /* Prepare to copy thread state - unlazy all lazy status */
 118 #define prepare_to_copy(tsk)    do { } while (0)
 119
 120 extern unsigned long get_wchan(struct task_struct *);
 121
 122 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 123 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 124
 125 #ifdef __KERNEL__
 126
 127 extern struct task_struct *last_task_used_math;
 128
 129 #define cpu_relax()     barrier()
 130
 131 #endif
 132
 133 #endif /* __ASM_SPARC_PROCESSOR_H */