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

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  1 /* include/asm/processor.h
  2  *
  3  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
  4  */
  5 
  6 #ifndef __ASM_SPARC_PROCESSOR_H
  7 #define __ASM_SPARC_PROCESSOR_H
  8 
  9 /*
 10  * Sparc32 implementation of macro that returns current
 11  * instruction pointer ("program counter").
 12  */
 13 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
 14 
 15 #include <asm/psr.h>
 16 #include <asm/ptrace.h>
 17 #include <asm/head.h>
 18 #include <asm/signal.h>
 19 #include <asm/page.h>
 20 
 21 /*
 22  * The sparc has no problems with write protection
 23  */
 24 #define wp_works_ok 1
 25 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
 26 
 27 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
 28  * That one page is used to protect kernel from intruders, so that
 29  * we can make our access_ok test faster
 30  */
 31 #define TASK_SIZE       PAGE_OFFSET
 32 #ifdef __KERNEL__
 33 #define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
 34 #define STACK_TOP_MAX   STACK_TOP
 35 #endif /* __KERNEL__ */
 36 
 37 struct task_struct;
 38 
 39 #ifdef __KERNEL__
 40 struct fpq {
 41         unsigned long *insn_addr;
 42         unsigned long insn;
 43 };
 44 #endif
 45 
 46 typedef struct {
 47         int seg;
 48 } mm_segment_t;
 49 
 50 /* The Sparc processor specific thread struct. */
 51 struct thread_struct {
 52         struct pt_regs *kregs;
 53         unsigned int _pad1;
 54 
 55         /* Special child fork kpsr/kwim values. */
 56         unsigned long fork_kpsr __attribute__ ((aligned (8)));
 57         unsigned long fork_kwim;
 58 
 59         /* Floating point regs */
 60         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
 61         unsigned long   fsr;
 62         unsigned long   fpqdepth;
 63         struct fpq      fpqueue[16];
 64         unsigned long flags;
 65         mm_segment_t current_ds;
 66 };
 67 
 68 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
 69 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
 70 
 71 #define INIT_THREAD  { \
 72         .flags = SPARC_FLAG_KTHREAD, \
 73         .current_ds = KERNEL_DS, \
 74 }
 75 
 76 /* Return saved PC of a blocked thread. */
 77 unsigned long thread_saved_pc(struct task_struct *t);
 78 
 79 /* Do necessary setup to start up a newly executed thread. */
 80 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
 81                                     unsigned long sp)
 82 {
 83         register unsigned long zero asm("g1");
 84 
 85         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
 86         regs->pc = ((pc & (~3)) - 4);
 87         regs->npc = regs->pc + 4;
 88         regs->y = 0;
 89         zero = 0;
 90         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
 91                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
 92                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
 93                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
 94                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
 95                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
 96                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
 97                              "st\t%1, [%0 + %3 + 0x38]\n\t"
 98                              "st\t%%g0, [%0 + %3 + 0x3c]"
 99                              : /* no outputs */
100                              : "r" (regs),
101                                "r" (sp - sizeof(struct reg_window32)),
102                                "r" (zero),
103                                "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
104                              : "memory");
105 }
106 
107 /* Free all resources held by a thread. */
108 #define release_thread(tsk)             do { } while(0)
109 
110 unsigned long get_wchan(struct task_struct *);
111 
112 #define task_pt_regs(tsk) ((tsk)->thread.kregs)
113 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
114 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
115 
116 #ifdef __KERNEL__
117 
118 extern struct task_struct *last_task_used_math;
119 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
120 
121 #define cpu_relax()     barrier()
122 extern void (*sparc_idle)(void);
123 
124 #endif
125 
126 #endif /* __ASM_SPARC_PROCESSOR_H */
127 

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