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 */ 120