LXR linux/arch/sparc/include/asm/processor

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* include/asm/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 <asm/psr.h>
  17#include <asm/ptrace.h>
  18#include <asm/head.h>
  19#include <asm/signal.h>
  20#include <asm/page.h>
  21
  22/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  23 * That one page is used to protect kernel from intruders, so that
  24 * we can make our access_ok test faster
  25 */
  26#define TASK_SIZE       PAGE_OFFSET
  27#ifdef __KERNEL__
  28#define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
  29#define STACK_TOP_MAX   STACK_TOP
  30#endif /* __KERNEL__ */
  31
  32struct task_struct;
  33
  34#ifdef __KERNEL__
  35struct fpq {
  36        unsigned long *insn_addr;
  37        unsigned long insn;
  38};
  39#endif
  40
  41typedef struct {
  42        int seg;
  43} mm_segment_t;
  44
  45/* The Sparc processor specific thread struct. */
  46struct thread_struct {
  47        struct pt_regs *kregs;
  48        unsigned int _pad1;
  49
  50        /* Special child fork kpsr/kwim values. */
  51        unsigned long fork_kpsr __attribute__ ((aligned (8)));
  52        unsigned long fork_kwim;
  53
  54        /* Floating point regs */
  55        unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  56        unsigned long   fsr;
  57        unsigned long   fpqdepth;
  58        struct fpq      fpqueue[16];
  59        unsigned long flags;
  60        mm_segment_t current_ds;
  61};
  62
  63#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  64#define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  65
  66#define INIT_THREAD  { \
  67        .flags = SPARC_FLAG_KTHREAD, \
  68        .current_ds = KERNEL_DS, \
  69}
  70
  71/* Do necessary setup to start up a newly executed thread. */
  72static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  73                                    unsigned long sp)
  74{
  75        register unsigned long zero asm("g1");
  76
  77        regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  78        regs->pc = ((pc & (~3)) - 4);
  79        regs->npc = regs->pc + 4;
  80        regs->y = 0;
  81        zero = 0;
  82        __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  83                             "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  84                             "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  85                             "std\t%%g0, [%0 + %3 + 0x18]\n\t"
  86                             "std\t%%g0, [%0 + %3 + 0x20]\n\t"
  87                             "std\t%%g0, [%0 + %3 + 0x28]\n\t"
  88                             "std\t%%g0, [%0 + %3 + 0x30]\n\t"
  89                             "st\t%1, [%0 + %3 + 0x38]\n\t"
  90                             "st\t%%g0, [%0 + %3 + 0x3c]"
  91                             : /* no outputs */
  92                             : "r" (regs),
  93                               "r" (sp - sizeof(struct reg_window32)),
  94                               "r" (zero),
  95                               "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
  96                             : "memory");
  97}
  98
  99/* Free all resources held by a thread. */
 100#define release_thread(tsk)             do { } while(0)
 101
 102unsigned long get_wchan(struct task_struct *);
 103
 104#define task_pt_regs(tsk) ((tsk)->thread.kregs)
 105#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 106#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 107
 108#ifdef __KERNEL__
 109
 110extern struct task_struct *last_task_used_math;
 111int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
 112
 113#define cpu_relax()     barrier()
 114
 115extern void (*sparc_idle)(void);
 116
 117#endif
 118
 119#endif /* __ASM_SPARC_PROCESSOR_H */
 120