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1/* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $
2 * include/asm-sparc/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 <linux/a.out.h>
17
18#include <asm/psr.h>
19#include <asm/ptrace.h>
20#include <asm/head.h>
21#include <asm/signal.h>
22#include <asm/segment.h>
23#include <asm/btfixup.h>
24#include <asm/page.h>
25
26/*
27 * The sparc has no problems with write protection
28 */
29#define wp_works_ok 1
30#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
31
32/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
33 * That one page is used to protect kernel from intruders, so that
34 * we can make our access_ok test faster
35 */
36#define TASK_SIZE PAGE_OFFSET
37
38struct task_struct;
39
40#ifdef __KERNEL__
41struct fpq {
42 unsigned long *insn_addr;
43 unsigned long insn;
44};
45#endif
46
47typedef struct {
48 int seg;
49} mm_segment_t;
50
51/* The Sparc processor specific thread struct. */
52struct thread_struct {
53 struct pt_regs *kregs;
54 unsigned int _pad1;
55
56 /* Special child fork kpsr/kwim values. */
57 unsigned long fork_kpsr __attribute__ ((aligned (8)));
58 unsigned long fork_kwim;
59
60 /* Floating point regs */
61 unsigned long float_regs[32] __attribute__ ((aligned (8)));
62 unsigned long fsr;
63 unsigned long fpqdepth;
64 struct fpq fpqueue[16];
65 unsigned long flags;
66 mm_segment_t current_ds;
67 struct exec core_exec; /* just what it says. */
68 int new_signal;
69};
70
71#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
72#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
73
74#define INIT_THREAD { \
75 .flags = SPARC_FLAG_KTHREAD, \
76 .current_ds = KERNEL_DS, \
77}
78
79/* Return saved PC of a blocked thread. */
80extern unsigned long thread_saved_pc(struct task_struct *t);
81
82/* Do necessary setup to start up a newly executed thread. */
83extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
84 unsigned long sp)
85{
86 register unsigned long zero asm("g1");
87
88 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
89 regs->pc = ((pc & (~3)) - 4);
90 regs->npc = regs->pc + 4;
91 regs->y = 0;
92 zero = 0;
93 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
94 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
95 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
96 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
97 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
98 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
99 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
100 "st\t%1, [%0 + %3 + 0x38]\n\t"
101 "st\t%%g0, [%0 + %3 + 0x3c]"
102 : /* no outputs */
103 : "r" (regs),
104 "r" (sp - sizeof(struct reg_window)),
105 "r" (zero),
106 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
107 : "memory");
108}
109
110/* Free all resources held by a thread. */
111#define release_thread(tsk) do { } while(0)
112extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
113
114/* Prepare to copy thread state - unlazy all lazy status */
115#define prepare_to_copy(tsk) do { } while (0)
116
117extern unsigned long get_wchan(struct task_struct *);
118
119#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
120#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
121
122#ifdef __KERNEL__
123
124extern struct task_struct *last_task_used_math;
125
126#define cpu_relax() barrier()
127
128#endif
129
130#endif /* __ASM_SPARC_PROCESSOR_H */