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 /* Free all resources held by a thread. */
84 #define release_thread(tsk)		do { } while(0)
85 
86 unsigned long __get_wchan(struct task_struct *);
87 
88 #define task_pt_regs(tsk) ((tsk)->thread.kregs)
89 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
90 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
91 
92 #ifdef __KERNEL__
93 
94 extern struct task_struct *last_task_used_math;
95 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
96 
97 #define cpu_relax()	barrier()
98 
99 extern void (*sparc_idle)(void);
100 
101 #endif
102 
103 #endif /* __ASM_SPARC_PROCESSOR_H */
104