File: /usr/src/linux/include/asm-sparc/processor.h
1 /* $Id: processor.h,v 1.82 2001/09/20 00:35:34 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 #include <asm/atomic.h>
26
27 /*
28 * Bus types
29 */
30 #define EISA_bus 0
31 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
32 #define MCA_bus 0
33 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
34
35 /*
36 * The sparc has no problems with write protection
37 */
38 #define wp_works_ok 1
39 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
40
41 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
42 * That one page is used to protect kernel from intruders, so that
43 * we can make our access_ok test faster
44 */
45 #define TASK_SIZE PAGE_OFFSET
46
47 struct fpq {
48 unsigned long *insn_addr;
49 unsigned long insn;
50 };
51
52 typedef struct {
53 int seg;
54 } mm_segment_t;
55
56 /* The Sparc processor specific thread struct. */
57 struct thread_struct {
58 unsigned long uwinmask __attribute__ ((aligned (8)));
59 struct pt_regs *kregs;
60
61 /* Context switch saved kernel state. */
62 unsigned long ksp __attribute__ ((aligned (8)));
63 unsigned long kpc;
64 unsigned long kpsr;
65 unsigned long kwim;
66
67 /* Special child fork kpsr/kwim values. */
68 unsigned long fork_kpsr __attribute__ ((aligned (8)));
69 unsigned long fork_kwim;
70
71 /* A place to store user windows and stack pointers
72 * when the stack needs inspection.
73 */
74 #define NSWINS 8
75 struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));
76 unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));
77 unsigned long w_saved;
78
79 /* Floating point regs */
80 unsigned long float_regs[32] __attribute__ ((aligned (8)));
81 unsigned long fsr;
82 unsigned long fpqdepth;
83 struct fpq fpqueue[16];
84 unsigned long flags;
85 mm_segment_t current_ds;
86 struct exec core_exec; /* just what it says. */
87 int new_signal;
88 atomic_t refcount; /* used for sun4c only */
89 };
90
91 #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
92 #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
93
94 #define INIT_THREAD { \
95 /* uwinmask, kregs, ksp, kpc, kpsr, kwim */ \
96 0, 0, 0, 0, 0, 0, \
97 /* fork_kpsr, fork_kwim */ \
98 0, 0, \
99 /* reg_window */ \
100 { { { 0, }, { 0, } }, }, \
101 /* rwbuf_stkptrs */ \
102 { 0, 0, 0, 0, 0, 0, 0, 0, }, \
103 /* w_saved */ \
104 0, \
105 /* FPU regs */ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
106 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
107 /* FPU status, FPU qdepth, FPU queue */ \
108 0, 0, { { 0, 0, }, }, \
109 /* flags, current_ds, */ \
110 SPARC_FLAG_KTHREAD, KERNEL_DS, \
111 /* core_exec */ \
112 { 0, }, \
113 /* new_signal */ \
114 0, \
115 }
116
117 /* Return saved PC of a blocked thread. */
118 extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
119 {
120 return t->kpc;
121 }
122
123 /* Do necessary setup to start up a newly executed thread. */
124 extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
125 unsigned long sp)
126 {
127 register unsigned long zero asm("g1");
128
129 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
130 regs->pc = ((pc & (~3)) - 4);
131 regs->npc = regs->pc + 4;
132 regs->y = 0;
133 zero = 0;
134 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
135 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
136 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
137 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
138 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
139 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
140 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
141 "st\t%1, [%0 + %3 + 0x38]\n\t"
142 "st\t%%g0, [%0 + %3 + 0x3c]"
143 : : "r" (regs), "r" (sp - REGWIN_SZ), "r" (zero),
144 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])));
145 }
146
147 /* Free all resources held by a thread. */
148 #define release_thread(tsk) do { } while(0)
149 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
150
151
152 #define copy_segments(tsk, mm) do { } while (0)
153 #define release_segments(mm) do { } while (0)
154
155 #define get_wchan(__TSK) \
156 ({ extern void scheduling_functions_start_here(void); \
157 extern void scheduling_functions_end_here(void); \
158 unsigned long pc, fp, bias = 0; \
159 unsigned long task_base = (unsigned long) (__TSK); \
160 unsigned long __ret = 0; \
161 struct reg_window *rw; \
162 int count = 0; \
163 if (!(__TSK) || (__TSK) == current || \
164 (__TSK)->state == TASK_RUNNING) \
165 goto __out; \
166 fp = (__TSK)->thread.ksp + bias; \
167 do { \
168 /* Bogus frame pointer? */ \
169 if (fp < (task_base + sizeof(struct task_struct)) || \
170 fp >= (task_base + (2 * PAGE_SIZE))) \
171 break; \
172 rw = (struct reg_window *) fp; \
173 pc = rw->ins[7]; \
174 if (pc < ((unsigned long) scheduling_functions_start_here) || \
175 pc >= ((unsigned long) scheduling_functions_end_here)) { \
176 __ret = pc; \
177 goto __out; \
178 } \
179 fp = rw->ins[6] + bias; \
180 } while (++count < 16); \
181 __out: __ret; \
182 })
183
184 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
185 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
186
187 #ifdef __KERNEL__
188 #define THREAD_SIZE (2*PAGE_SIZE)
189
190 extern struct task_struct *last_task_used_math;
191
192 /* Allocation and freeing of basic task resources. */
193 BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void)
194 BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *)
195 BTFIXUPDEF_CALL(void, get_task_struct, struct task_struct *)
196
197 #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
198 #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
199 #define get_task_struct(tsk) BTFIXUP_CALL(get_task_struct)(tsk)
200
201 #define init_task (init_task_union.task)
202 #define init_stack (init_task_union.stack)
203
204 #endif
205
206 #endif /* __ASM_SPARC_PROCESSOR_H */
207