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. */
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)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