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 /* The Sparc processor specific thread struct. */ 36 struct thread_struct { 37 struct pt_regs *kregs; 38 unsigned int _pad1; 39 40 /* Special child fork kpsr/kwim values. */ 41 unsigned long fork_kpsr __attribute__ ((aligned (8))); 42 unsigned long fork_kwim; 43 44 /* Floating point regs */ 45 unsigned long float_regs[32] __attribute__ ((aligned (8))); 46 unsigned long fsr; 47 unsigned long fpqdepth; 48 struct fpq fpqueue[16]; 49 }; 50 51 #define INIT_THREAD { \ 52 .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \ 53 } 54 55 /* Do necessary setup to start up a newly executed thread. */ 56 static inline void start_thread(struct pt_regs * regs, unsigned long pc, 57 unsigned long sp) 58 { 59 register unsigned long zero asm("g1"); 60 61 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S; 62 regs->pc = ((pc & (~3)) - 4); 63 regs->npc = regs->pc + 4; 64 regs->y = 0; 65 zero = 0; 66 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t" 67 "std\t%%g0, [%0 + %3 + 0x08]\n\t" 68 "std\t%%g0, [%0 + %3 + 0x10]\n\t" 69 "std\t%%g0, [%0 + %3 + 0x18]\n\t" 70 "std\t%%g0, [%0 + %3 + 0x20]\n\t" 71 "std\t%%g0, [%0 + %3 + 0x28]\n\t" 72 "std\t%%g0, [%0 + %3 + 0x30]\n\t" 73 "st\t%1, [%0 + %3 + 0x38]\n\t" 74 "st\t%%g0, [%0 + %3 + 0x3c]" 75 : /* no outputs */ 76 : "r" (regs), 77 "r" (sp - sizeof(struct reg_window32)), 78 "r" (zero), 79 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])) 80 : "memory"); 81 } 82 83 unsigned long __get_wchan(struct task_struct *); 84 85 #define task_pt_regs(tsk) ((tsk)->thread.kregs) 86 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc) 87 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP]) 88 89 #ifdef __KERNEL__ 90 91 extern struct task_struct *last_task_used_math; 92 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt); 93 94 #define cpu_relax() barrier() 95 96 extern void (*sparc_idle)(void); 97 98 #endif 99 100 #endif /* __ASM_SPARC_PROCESSOR_H */ 101