1 /* $Id: processor.h,v 1.77 2000/01/21 11:39:17 jj Exp $
2 * include/asm-sparc/processor.h
4 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
7 #ifndef __ASM_SPARC_PROCESSOR_H
8 #define __ASM_SPARC_PROCESSOR_H
11 * Sparc32 implementation of macro that returns current
12 * instruction pointer ("program counter").
14 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
16 #include <linux/a.out.h>
19 #include <asm/ptrace.h>
21 #include <asm/signal.h>
22 #include <asm/segment.h>
23 #include <asm/btfixup.h>
25 #include <asm/atomic.h>
31 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
33 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
36 * The sparc has no problems with write protection
39 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
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
45 #define TASK_SIZE PAGE_OFFSET
48 unsigned long *insn_addr
;
56 /* The Sparc processor specific thread struct. */
57 struct thread_struct
{
58 unsigned long uwinmask
__attribute__ ((aligned (8)));
59 struct pt_regs
*kregs
;
61 /* Context switch saved kernel state. */
62 unsigned long ksp
__attribute__ ((aligned (8)));
67 /* Special child fork kpsr/kwim values. */
68 unsigned long fork_kpsr
__attribute__ ((aligned (8)));
69 unsigned long fork_kwim
;
71 /* A place to store user windows and stack pointers
72 * when the stack needs inspection.
75 struct reg_window reg_window
[NSWINS
] __attribute__ ((aligned (8)));
76 unsigned long rwbuf_stkptrs
[NSWINS
] __attribute__ ((aligned (8)));
77 unsigned long w_saved
;
79 /* Floating point regs */
80 unsigned long float_regs
[32] __attribute__ ((aligned (8)));
82 unsigned long fpqdepth
;
83 struct fpq fpqueue
[16];
85 mm_segment_t current_ds
;
86 struct exec core_exec
; /* just what it says. */
88 atomic_t refcount
; /* used for sun4c only */
91 #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
92 #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
94 #define INIT_MMAP { &init_mm, (0), (0), \
95 NULL, __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
97 #define INIT_THREAD { \
98 /* uwinmask, kregs, ksp, kpc, kpsr, kwim */ \
100 /* fork_kpsr, fork_kwim */ \
103 { { { 0, }, { 0, } }, }, \
104 /* rwbuf_stkptrs */ \
105 { 0, 0, 0, 0, 0, 0, 0, 0, }, \
108 /* FPU regs */ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
109 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
110 /* FPU status, FPU qdepth, FPU queue */ \
111 0, 0, { { 0, 0, }, }, \
112 /* flags, current_ds, */ \
113 SPARC_FLAG_KTHREAD, KERNEL_DS, \
120 /* Return saved PC of a blocked thread. */
121 extern __inline__
unsigned long thread_saved_pc(struct thread_struct
*t
)
126 /* Do necessary setup to start up a newly executed thread. */
127 extern __inline__
void start_thread(struct pt_regs
* regs
, unsigned long pc
,
130 register unsigned long zero
asm("g1");
132 regs
->psr
= (regs
->psr
& (PSR_CWP
)) | PSR_S
;
133 regs
->pc
= ((pc
& (~3)) - 4);
134 regs
->npc
= regs
->pc
+ 4;
137 __asm__
__volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
138 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
139 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
140 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
141 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
142 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
143 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
144 "st\t%1, [%0 + %3 + 0x38]\n\t"
145 "st\t%%g0, [%0 + %3 + 0x3c]"
146 : : "r" (regs
), "r" (sp
- REGWIN_SZ
), "r" (zero
),
147 "i" ((const unsigned long)(&((struct pt_regs
*)0)->u_regs
[0])));
150 /* Free all resources held by a thread. */
151 #define release_thread(tsk) do { } while(0)
152 extern pid_t
kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
);
155 #define copy_segments(__tsk, __mm) \
156 if((__tsk) == current && \
159 #define release_segments(mm) do { } while (0)
160 #define forget_segments() do { } while (0)
162 #define get_wchan(__TSK) \
163 ({ extern void scheduling_functions_start_here(void); \
164 extern void scheduling_functions_end_here(void); \
165 unsigned long pc, fp, bias = 0; \
166 unsigned long task_base = (unsigned long) (__TSK); \
167 unsigned long __ret = 0; \
168 struct reg_window *rw; \
170 if (!(__TSK) || (__TSK) == current || \
171 (__TSK)->state == TASK_RUNNING) \
173 fp = (__TSK)->thread.ksp + bias; \
175 /* Bogus frame pointer? */ \
176 if (fp < (task_base + sizeof(struct task_struct)) || \
177 fp >= (task_base + (2 * PAGE_SIZE))) \
179 rw = (struct reg_window *) fp; \
181 if (pc < ((unsigned long) scheduling_functions_start_here) || \
182 pc >= ((unsigned long) scheduling_functions_end_here)) { \
186 fp = rw->ins[6] + bias; \
187 } while (++count < 16); \
191 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
192 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
195 #define THREAD_SIZE (2*PAGE_SIZE)
197 extern struct task_struct
*last_task_used_math
;
199 /* Allocation and freeing of basic task resources. */
200 BTFIXUPDEF_CALL(struct task_struct
*, alloc_task_struct
, void)
201 BTFIXUPDEF_CALL(void, free_task_struct
, struct task_struct
*)
202 BTFIXUPDEF_CALL(void, get_task_struct
, struct task_struct
*)
204 #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
205 #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
206 #define get_task_struct(tsk) BTFIXUP_CALL(get_task_struct)(tsk)
208 #define init_task (init_task_union.task)
209 #define init_stack (init_task_union.stack)
213 #endif /* __ASM_SPARC_PROCESSOR_H */