LXR linux-old/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/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
  47struct fpq {
  48        unsigned long *insn_addr;
  49        unsigned long insn;
  50};
  51
  52typedef struct {
  53        int seg;
  54} mm_segment_t;
  55
  56/* The Sparc processor specific thread struct. */
  57struct 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_THREAD  { \
  95/* uwinmask, kregs, ksp, kpc, kpsr, kwim */ \
  96   0,        0,     0,   0,   0,    0, \
  97/* fork_kpsr, fork_kwim */ \
  98   0,         0, \
  99/* reg_window */  \
 100{ { { 0, }, { 0, } }, }, \
 101/* rwbuf_stkptrs */  \
 102{ 0, 0, 0, 0, 0, 0, 0, 0, }, \
 103/* w_saved */ \
 104   0, \
 105/* FPU regs */   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 106                   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
 107/* FPU status, FPU qdepth, FPU queue */ \
 108   0,          0,  { { 0, 0, }, }, \
 109/* flags,              current_ds, */ \
 110   SPARC_FLAG_KTHREAD, KERNEL_DS, \
 111/* core_exec */ \
 112{ 0, }, \
 113/* new_signal */ \
 114  0, \
 115}
 116
 117/* Return saved PC of a blocked thread. */
 118extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
 119{
 120        return t->kpc;
 121}
 122
 123/* Do necessary setup to start up a newly executed thread. */
 124extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
 125                                    unsigned long sp)
 126{
 127        register unsigned long zero asm("g1");
 128
 129        regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
 130        regs->pc = ((pc & (~3)) - 4);
 131        regs->npc = regs->pc + 4;
 132        regs->y = 0;
 133        zero = 0;
 134        __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
 135                             "std\t%%g0, [%0 + %3 + 0x08]\n\t"
 136                             "std\t%%g0, [%0 + %3 + 0x10]\n\t"
 137                             "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 138                             "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 139                             "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 140                             "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 141                             "st\t%1, [%0 + %3 + 0x38]\n\t"
 142                             "st\t%%g0, [%0 + %3 + 0x3c]"
 143                             : /* no outputs */
 144                             : "r" (regs),
 145                               "r" (sp - sizeof(struct reg_window)),
 146                               "r" (zero),
 147                               "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
 148                             : "memory");
 149}
 150
 151/* Free all resources held by a thread. */
 152#define release_thread(tsk)             do { } while(0)
 153extern pid_t arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 154
 155
 156#define copy_segments(tsk, mm)          do { } while (0)
 157#define release_segments(mm)            do { } while (0)
 158
 159#define get_wchan(__TSK) \
 160({      extern void scheduling_functions_start_here(void); \
 161        extern void scheduling_functions_end_here(void); \
 162        unsigned long pc, fp, bias = 0; \
 163        unsigned long task_base = (unsigned long) (__TSK); \
 164        unsigned long __ret = 0; \
 165        struct reg_window *rw; \
 166        int count = 0; \
 167        if (!(__TSK) || (__TSK) == current || \
 168            (__TSK)->state == TASK_RUNNING) \
 169                goto __out; \
 170        fp = (__TSK)->thread.ksp + bias; \
 171        do { \
 172                /* Bogus frame pointer? */ \
 173                if (fp < (task_base + sizeof(struct task_struct)) || \
 174                    fp >= (task_base + (2 * PAGE_SIZE))) \
 175                        break; \
 176                rw = (struct reg_window *) fp; \
 177                pc = rw->ins[7]; \
 178                if (pc < ((unsigned long) scheduling_functions_start_here) || \
 179                    pc >= ((unsigned long) scheduling_functions_end_here)) { \
 180                        __ret = pc; \
 181                        goto __out; \
 182                } \
 183                fp = rw->ins[6] + bias; \
 184        } while (++count < 16); \
 185__out:  __ret; \
 186})
 187
 188#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 189#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 190
 191#ifdef __KERNEL__
 192#define THREAD_SIZE (2*PAGE_SIZE)
 193
 194extern struct task_struct *last_task_used_math;
 195
 196/* Allocation and freeing of basic task resources. */
 197BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void)
 198BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *)
 199BTFIXUPDEF_CALL(void, get_task_struct, struct task_struct *)
 200
 201#define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
 202#define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
 203#define get_task_struct(tsk) BTFIXUP_CALL(get_task_struct)(tsk)
 204
 205#define init_task       (init_task_union.task)
 206#define init_stack      (init_task_union.stack)
 207
 208#define cpu_relax()     barrier()
 209
 210#endif
 211
 212#endif /* __ASM_SPARC_PROCESSOR_H */
 213