root/arch/sparc/include/asm/processor_32.h

INCLUDED FROM

DEFINITIONS

1. start_thread

   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 #include <asm/psr.h>
  11 #include <asm/ptrace.h>
  12 #include <asm/head.h>
  13 #include <asm/signal.h>
  14 #include <asm/page.h>
  15 
  16 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  17  * That one page is used to protect kernel from intruders, so that
  18  * we can make our access_ok test faster
  19  */
  20 #define TASK_SIZE       PAGE_OFFSET
  21 #ifdef __KERNEL__
  22 #define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
  23 #define STACK_TOP_MAX   STACK_TOP
  24 #endif /* __KERNEL__ */
  25 
  26 struct task_struct;
  27 
  28 #ifdef __KERNEL__
  29 struct fpq {
  30         unsigned long *insn_addr;
  31         unsigned long insn;
  32 };
  33 #endif
  34 
  35 typedef struct {
  36         int seg;
  37 } mm_segment_t;
  38 
  39 /* The Sparc processor specific thread struct. */
  40 struct thread_struct {
  41         struct pt_regs *kregs;
  42         unsigned int _pad1;
  43 
  44         /* Special child fork kpsr/kwim values. */
  45         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  46         unsigned long fork_kwim;
  47 
  48         /* Floating point regs */
  49         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  50         unsigned long   fsr;
  51         unsigned long   fpqdepth;
  52         struct fpq      fpqueue[16];
  53         unsigned long flags;
  54         mm_segment_t current_ds;
  55 };
  56 
  57 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  58 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  59 
  60 #define INIT_THREAD  { \
  61         .flags = SPARC_FLAG_KTHREAD, \
  62         .current_ds = KERNEL_DS, \
  63 }
  64 
  65 /* Do necessary setup to start up a newly executed thread. */
  66 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  67                                     unsigned long sp)
  68 {
  69         register unsigned long zero asm("g1");
  70 
  71         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  72         regs->pc = ((pc & (~3)) - 4);
  73         regs->npc = regs->pc + 4;
  74         regs->y = 0;
  75         zero = 0;
  76         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  77                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  78                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  79                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
  80                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
  81                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
  82                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
  83                              "st\t%1, [%0 + %3 + 0x38]\n\t"
  84                              "st\t%%g0, [%0 + %3 + 0x3c]"
  85                              : /* no outputs */
  86                              : "r" (regs),
  87                                "r" (sp - sizeof(struct reg_window32)),
  88                                "r" (zero),
  89                                "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
  90                              : "memory");
  91 }
  92 
  93 /* Free all resources held by a thread. */
  94 #define release_thread(tsk)             do { } while(0)
  95 
  96 unsigned long get_wchan(struct task_struct *);
  97 
  98 #define task_pt_regs(tsk) ((tsk)->thread.kregs)
  99 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 100 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 101 
 102 #ifdef __KERNEL__
 103 
 104 extern struct task_struct *last_task_used_math;
 105 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
 106 
 107 #define cpu_relax()     barrier()
 108 
 109 extern void (*sparc_idle)(void);
 110 
 111 #endif
 112 
 113 #endif /* __ASM_SPARC_PROCESSOR_H */