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