Linux kernel mirror (for testing)
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1/* include/asm/processor.h
2 *
3 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
4 */
5
6#ifndef __ASM_SPARC_PROCESSOR_H
7#define __ASM_SPARC_PROCESSOR_H
8
9/*
10 * Sparc32 implementation of macro that returns current
11 * instruction pointer ("program counter").
12 */
13#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
14
15#include <asm/psr.h>
16#include <asm/ptrace.h>
17#include <asm/head.h>
18#include <asm/signal.h>
19#include <asm/page.h>
20
21/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
22 * That one page is used to protect kernel from intruders, so that
23 * we can make our access_ok test faster
24 */
25#define TASK_SIZE PAGE_OFFSET
26#ifdef __KERNEL__
27#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
28#define STACK_TOP_MAX STACK_TOP
29#endif /* __KERNEL__ */
30
31struct task_struct;
32
33#ifdef __KERNEL__
34struct fpq {
35 unsigned long *insn_addr;
36 unsigned long insn;
37};
38#endif
39
40typedef struct {
41 int seg;
42} mm_segment_t;
43
44/* The Sparc processor specific thread struct. */
45struct thread_struct {
46 struct pt_regs *kregs;
47 unsigned int _pad1;
48
49 /* Special child fork kpsr/kwim values. */
50 unsigned long fork_kpsr __attribute__ ((aligned (8)));
51 unsigned long fork_kwim;
52
53 /* Floating point regs */
54 unsigned long float_regs[32] __attribute__ ((aligned (8)));
55 unsigned long fsr;
56 unsigned long fpqdepth;
57 struct fpq fpqueue[16];
58 unsigned long flags;
59 mm_segment_t current_ds;
60};
61
62#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
63#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
64
65#define INIT_THREAD { \
66 .flags = SPARC_FLAG_KTHREAD, \
67 .current_ds = KERNEL_DS, \
68}
69
70/* Do necessary setup to start up a newly executed thread. */
71static inline void start_thread(struct pt_regs * regs, unsigned long pc,
72 unsigned long sp)
73{
74 register unsigned long zero asm("g1");
75
76 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
77 regs->pc = ((pc & (~3)) - 4);
78 regs->npc = regs->pc + 4;
79 regs->y = 0;
80 zero = 0;
81 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
82 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
83 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
84 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
85 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
86 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
87 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
88 "st\t%1, [%0 + %3 + 0x38]\n\t"
89 "st\t%%g0, [%0 + %3 + 0x3c]"
90 : /* no outputs */
91 : "r" (regs),
92 "r" (sp - sizeof(struct reg_window32)),
93 "r" (zero),
94 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
95 : "memory");
96}
97
98/* Free all resources held by a thread. */
99#define release_thread(tsk) do { } while(0)
100
101unsigned long get_wchan(struct task_struct *);
102
103#define task_pt_regs(tsk) ((tsk)->thread.kregs)
104#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
105#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
106
107#ifdef __KERNEL__
108
109extern struct task_struct *last_task_used_math;
110int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
111
112#define cpu_relax() barrier()
113
114extern void (*sparc_idle)(void);
115
116#endif
117
118#endif /* __ASM_SPARC_PROCESSOR_H */