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/btfixup.h> 20#include <asm/page.h> 21 22/* 23 * The sparc has no problems with write protection 24 */ 25#define wp_works_ok 1 26#define wp_works_ok__is_a_macro /* for versions in ksyms.c */ 27 28/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too... 29 * That one page is used to protect kernel from intruders, so that 30 * we can make our access_ok test faster 31 */ 32#define TASK_SIZE PAGE_OFFSET 33#ifdef __KERNEL__ 34#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE) 35#define STACK_TOP_MAX STACK_TOP 36#endif /* __KERNEL__ */ 37 38struct task_struct; 39 40#ifdef __KERNEL__ 41struct fpq { 42 unsigned long *insn_addr; 43 unsigned long insn; 44}; 45#endif 46 47typedef struct { 48 int seg; 49} mm_segment_t; 50 51/* The Sparc processor specific thread struct. */ 52struct thread_struct { 53 struct pt_regs *kregs; 54 unsigned int _pad1; 55 56 /* Special child fork kpsr/kwim values. */ 57 unsigned long fork_kpsr __attribute__ ((aligned (8))); 58 unsigned long fork_kwim; 59 60 /* Floating point regs */ 61 unsigned long float_regs[32] __attribute__ ((aligned (8))); 62 unsigned long fsr; 63 unsigned long fpqdepth; 64 struct fpq fpqueue[16]; 65 unsigned long flags; 66 mm_segment_t current_ds; 67}; 68 69#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */ 70#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */ 71 72#define INIT_THREAD { \ 73 .flags = SPARC_FLAG_KTHREAD, \ 74 .current_ds = KERNEL_DS, \ 75} 76 77/* Return saved PC of a blocked thread. */ 78extern unsigned long thread_saved_pc(struct task_struct *t); 79 80/* Do necessary setup to start up a newly executed thread. */ 81static inline void start_thread(struct pt_regs * regs, unsigned long pc, 82 unsigned long sp) 83{ 84 register unsigned long zero asm("g1"); 85 86 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S; 87 regs->pc = ((pc & (~3)) - 4); 88 regs->npc = regs->pc + 4; 89 regs->y = 0; 90 zero = 0; 91 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t" 92 "std\t%%g0, [%0 + %3 + 0x08]\n\t" 93 "std\t%%g0, [%0 + %3 + 0x10]\n\t" 94 "std\t%%g0, [%0 + %3 + 0x18]\n\t" 95 "std\t%%g0, [%0 + %3 + 0x20]\n\t" 96 "std\t%%g0, [%0 + %3 + 0x28]\n\t" 97 "std\t%%g0, [%0 + %3 + 0x30]\n\t" 98 "st\t%1, [%0 + %3 + 0x38]\n\t" 99 "st\t%%g0, [%0 + %3 + 0x3c]" 100 : /* no outputs */ 101 : "r" (regs), 102 "r" (sp - sizeof(struct reg_window32)), 103 "r" (zero), 104 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])) 105 : "memory"); 106} 107 108/* Free all resources held by a thread. */ 109#define release_thread(tsk) do { } while(0) 110extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 111 112/* Prepare to copy thread state - unlazy all lazy status */ 113#define prepare_to_copy(tsk) do { } while (0) 114 115extern unsigned long get_wchan(struct task_struct *); 116 117#define task_pt_regs(tsk) ((tsk)->thread.kregs) 118#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc) 119#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP]) 120 121#ifdef __KERNEL__ 122 123extern struct task_struct *last_task_used_math; 124 125#define cpu_relax() barrier() 126 127#endif 128 129#endif /* __ASM_SPARC_PROCESSOR_H */ 130