1 #ifndef __ASM_SH_PROCESSOR_64_H
2 #define __ASM_SH_PROCESSOR_64_H
3
4 /*
5 * include/asm-sh/processor_64.h
6 *
7 * Copyright (C) 2000, 2001 Paolo Alberelli
8 * Copyright (C) 2003 Paul Mundt
9 * Copyright (C) 2004 Richard Curnow
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15 #ifndef __ASSEMBLY__
16
17 #include <linux/compiler.h>
18 #include <asm/page.h>
19 #include <asm/types.h>
20 #include <asm/ptrace.h>
21 #include <cpu/registers.h>
22
23 /*
24 * Default implementation of macro that returns current
25 * instruction pointer ("program counter").
26 */
27 #define current_text_addr() ({ \
28 void *pc; \
29 unsigned long long __dummy = 0; \
30 __asm__("gettr tr0, %1\n\t" \
31 "pta 4, tr0\n\t" \
32 "gettr tr0, %0\n\t" \
33 "ptabs %1, tr0\n\t" \
34 :"=r" (pc), "=r" (__dummy) \
35 : "1" (__dummy)); \
36 pc; })
37
38 #endif
39
40 /*
41 * User space process size: 2GB - 4k.
42 */
43 #define TASK_SIZE 0x7ffff000UL
44
45 #define STACK_TOP TASK_SIZE
46 #define STACK_TOP_MAX STACK_TOP
47
48 /* This decides where the kernel will search for a free chunk of vm
49 * space during mmap's.
50 */
51 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
52
53 /*
54 * Bit of SR register
55 *
56 * FD-bit:
57 * When it's set, it means the processor doesn't have right to use FPU,
58 * and it results exception when the floating operation is executed.
59 *
60 * IMASK-bit:
61 * Interrupt level mask
62 *
63 * STEP-bit:
64 * Single step bit
65 *
66 */
67 #if defined(CONFIG_SH64_SR_WATCH)
68 #define SR_MMU 0x84000000
69 #else
70 #define SR_MMU 0x80000000
71 #endif
72
73 #define SR_IMASK 0x000000f0
74 #define SR_FD 0x00008000
75 #define SR_SSTEP 0x08000000
76
77 #ifndef __ASSEMBLY__
78
79 /*
80 * FPU structure and data : require 8-byte alignment as we need to access it
81 with fld.p, fst.p
82 */
83
84 struct sh_fpu_hard_struct {
85 unsigned long fp_regs[64];
86 unsigned int fpscr;
87 /* long status; * software status information */
88 };
89
90 #if 0
91 /* Dummy fpu emulator */
92 struct sh_fpu_soft_struct {
93 unsigned long long fp_regs[32];
94 unsigned int fpscr;
95 unsigned char lookahead;
96 unsigned long entry_pc;
97 };
98 #endif
99
100 union sh_fpu_union {
101 struct sh_fpu_hard_struct hard;
102 /* 'hard' itself only produces 32 bit alignment, yet we need
103 to access it using 64 bit load/store as well. */
104 unsigned long long alignment_dummy;
105 };
106
107 struct thread_struct {
108 unsigned long sp;
109 unsigned long pc;
110 /* This stores the address of the pt_regs built during a context
111 switch, or of the register save area built for a kernel mode
112 exception. It is used for backtracing the stack of a sleeping task
113 or one that traps in kernel mode. */
114 struct pt_regs *kregs;
115 /* This stores the address of the pt_regs constructed on entry from
116 user mode. It is a fixed value over the lifetime of a process, or
117 NULL for a kernel thread. */
118 struct pt_regs *uregs;
119
120 unsigned long trap_no, error_code;
121 unsigned long address;
122 /* Hardware debugging registers may come here */
123
124 /* floating point info */
125 union sh_fpu_union fpu;
126 };
127
128 #define INIT_MMAP \
129 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
130
131 #define INIT_THREAD { \
132 .sp = sizeof(init_stack) + \
133 (long) &init_stack, \
134 .pc = 0, \
135 .kregs = &fake_swapper_regs, \
136 .uregs = NULL, \
137 .trap_no = 0, \
138 .error_code = 0, \
139 .address = 0, \
140 .fpu = { { { 0, } }, } \
141 }
142
143 /*
144 * Do necessary setup to start up a newly executed thread.
145 */
146 #define SR_USER (SR_MMU | SR_FD)
147
148 #define start_thread(regs, new_pc, new_sp) \
149 set_fs(USER_DS); \
150 regs->sr = SR_USER; /* User mode. */ \
151 regs->pc = new_pc - 4; /* Compensate syscall exit */ \
152 regs->pc |= 1; /* Set SHmedia ! */ \
153 regs->regs[18] = 0; \
154 regs->regs[15] = new_sp
155
156 /* Forward declaration, a strange C thing */
157 struct task_struct;
158 struct mm_struct;
159
160 /* Free all resources held by a thread. */
161 extern void release_thread(struct task_struct *);
162 /*
163 * create a kernel thread without removing it from tasklists
164 */
165 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
166
167
168 /* Copy and release all segment info associated with a VM */
169 #define copy_segments(p, mm) do { } while (0)
170 #define release_segments(mm) do { } while (0)
171 #define forget_segments() do { } while (0)
172 #define prepare_to_copy(tsk) do { } while (0)
173 /*
174 * FPU lazy state save handling.
175 */
176
disable_fpu(void)177 static inline void disable_fpu(void)
178 {
179 unsigned long long __dummy;
180
181 /* Set FD flag in SR */
182 __asm__ __volatile__("getcon " __SR ", %0\n\t"
183 "or %0, %1, %0\n\t"
184 "putcon %0, " __SR "\n\t"
185 : "=&r" (__dummy)
186 : "r" (SR_FD));
187 }
188
enable_fpu(void)189 static inline void enable_fpu(void)
190 {
191 unsigned long long __dummy;
192
193 /* Clear out FD flag in SR */
194 __asm__ __volatile__("getcon " __SR ", %0\n\t"
195 "and %0, %1, %0\n\t"
196 "putcon %0, " __SR "\n\t"
197 : "=&r" (__dummy)
198 : "r" (~SR_FD));
199 }
200
201 /* Round to nearest, no exceptions on inexact, overflow, underflow,
202 zero-divide, invalid. Configure option for whether to flush denorms to
203 zero, or except if a denorm is encountered. */
204 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
205 #define FPSCR_INIT 0x00040000
206 #else
207 #define FPSCR_INIT 0x00000000
208 #endif
209
210 #ifdef CONFIG_SH_FPU
211 /* Initialise the FP state of a task */
212 void fpinit(struct sh_fpu_hard_struct *fpregs);
213 #else
214 #define fpinit(fpregs) do { } while (0)
215 #endif
216
217 extern struct task_struct *last_task_used_math;
218
219 /*
220 * Return saved PC of a blocked thread.
221 */
222 #define thread_saved_pc(tsk) (tsk->thread.pc)
223
224 extern unsigned long get_wchan(struct task_struct *p);
225
226 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
227 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
228
229 #define user_stack_pointer(regs) ((regs)->regs[15])
230
231 #endif /* __ASSEMBLY__ */
232 #endif /* __ASM_SH_PROCESSOR_64_H */
233