Linux kernel mirror (for testing)
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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
32struct task_struct;
33
34#ifdef __KERNEL__
35struct fpq {
36 unsigned long *insn_addr;
37 unsigned long insn;
38};
39#endif
40
41typedef struct {
42 int seg;
43} mm_segment_t;
44
45/* The Sparc processor specific thread struct. */
46struct 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. */
72static 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
102unsigned 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
110extern struct task_struct *last_task_used_math;
111int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
112
113#define cpu_relax() barrier()
114
115extern void (*sparc_idle)(void);
116
117#endif
118
119#endif /* __ASM_SPARC_PROCESSOR_H */