arch/sparc/include/asm/processor_32.h

   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
  32 struct task_struct;
  33
  34 #ifdef __KERNEL__
  35 struct fpq {
  36         unsigned long *insn_addr;
  37         unsigned long insn;
  38 };
  39 #endif
  40
  41 typedef struct {
  42         int seg;
  43 } mm_segment_t;
  44
  45 /* The Sparc processor specific thread struct. */
  46 struct 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. */
  72 static 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
 102 unsigned 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
 110 extern struct task_struct *last_task_used_math;
 111 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
 112
 113 #define cpu_relax()     barrier()
 114
 115 extern void (*sparc_idle)(void);
 116
 117 #endif
 118
 119 #endif /* __ASM_SPARC_PROCESSOR_H */