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 /*
22 * The sparc has no problems with write protection
23 */
24 #define wp_works_ok 1
25 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
26
27 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
28 * That one page is used to protect kernel from intruders, so that
29 * we can make our access_ok test faster
30 */
31 #define TASK_SIZE PAGE_OFFSET
32 #ifdef __KERNEL__
33 #define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
34 #define STACK_TOP_MAX STACK_TOP
35 #endif /* __KERNEL__ */
36
37 struct task_struct;
38
39 #ifdef __KERNEL__
40 struct fpq {
41 unsigned long *insn_addr;
42 unsigned long insn;
43 };
44 #endif
45
46 typedef struct {
47 int seg;
48 } mm_segment_t;
49
50 /* The Sparc processor specific thread struct. */
51 struct thread_struct {
52 struct pt_regs *kregs;
53 unsigned int _pad1;
54
55 /* Special child fork kpsr/kwim values. */
56 unsigned long fork_kpsr __attribute__ ((aligned (8)));
57 unsigned long fork_kwim;
58
59 /* Floating point regs */
60 unsigned long float_regs[32] __attribute__ ((aligned (8)));
61 unsigned long fsr;
62 unsigned long fpqdepth;
63 struct fpq fpqueue[16];
64 unsigned long flags;
65 mm_segment_t current_ds;
66 };
67
68 #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
69 #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
70
71 #define INIT_THREAD { \
72 .flags = SPARC_FLAG_KTHREAD, \
73 .current_ds = KERNEL_DS, \
74 }
75
76 /* Return saved PC of a blocked thread. */
77 unsigned long thread_saved_pc(struct task_struct *t);
78
79 /* Do necessary setup to start up a newly executed thread. */
start_thread(struct pt_regs * regs,unsigned long pc,unsigned long sp)80 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
81 unsigned long sp)
82 {
83 register unsigned long zero asm("g1");
84
85 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
86 regs->pc = ((pc & (~3)) - 4);
87 regs->npc = regs->pc + 4;
88 regs->y = 0;
89 zero = 0;
90 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
91 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
92 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
93 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
94 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
95 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
96 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
97 "st\t%1, [%0 + %3 + 0x38]\n\t"
98 "st\t%%g0, [%0 + %3 + 0x3c]"
99 : /* no outputs */
100 : "r" (regs),
101 "r" (sp - sizeof(struct reg_window32)),
102 "r" (zero),
103 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
104 : "memory");
105 }
106
107 /* Free all resources held by a thread. */
108 #define release_thread(tsk) do { } while(0)
109
110 unsigned long get_wchan(struct task_struct *);
111
112 #define task_pt_regs(tsk) ((tsk)->thread.kregs)
113 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
114 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
115
116 #ifdef __KERNEL__
117
118 extern struct task_struct *last_task_used_math;
119 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
120
121 #define cpu_relax() barrier()
122 #define cpu_relax_lowlatency() cpu_relax()
123
124 extern void (*sparc_idle)(void);
125
126 #endif
127
128 #endif /* __ASM_SPARC_PROCESSOR_H */
129