1 /* include/asm-sparc/processor.h
3 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
6 #ifndef __ASM_SPARC_PROCESSOR_H
7 #define __ASM_SPARC_PROCESSOR_H
10 * Sparc32 implementation of macro that returns current
11 * instruction pointer ("program counter").
13 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
16 #include <asm/ptrace.h>
18 #include <asm/signal.h>
19 #include <asm/btfixup.h>
23 * The sparc has no problems with write protection
26 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
28 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
29 * That one page is used to protect kernel from intruders, so that
30 * we can make our access_ok test faster
32 #define TASK_SIZE PAGE_OFFSET
34 #define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
35 #define STACK_TOP_MAX STACK_TOP
36 #endif /* __KERNEL__ */
42 unsigned long *insn_addr;
51 /* The Sparc processor specific thread struct. */
52 struct thread_struct {
53 struct pt_regs *kregs;
56 /* Special child fork kpsr/kwim values. */
57 unsigned long fork_kpsr __attribute__ ((aligned (8)));
58 unsigned long fork_kwim;
60 /* Floating point regs */
61 unsigned long float_regs[32] __attribute__ ((aligned (8)));
63 unsigned long fpqdepth;
64 struct fpq fpqueue[16];
66 mm_segment_t current_ds;
69 #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
70 #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
72 #define INIT_THREAD { \
73 .flags = SPARC_FLAG_KTHREAD, \
74 .current_ds = KERNEL_DS, \
77 /* Return saved PC of a blocked thread. */
78 extern unsigned long thread_saved_pc(struct task_struct *t);
80 /* Do necessary setup to start up a newly executed thread. */
81 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
84 register unsigned long zero asm("g1");
86 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
87 regs->pc = ((pc & (~3)) - 4);
88 regs->npc = regs->pc + 4;
91 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
92 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
93 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
94 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
95 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
96 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
97 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
98 "st\t%1, [%0 + %3 + 0x38]\n\t"
99 "st\t%%g0, [%0 + %3 + 0x3c]"
102 "r" (sp - sizeof(struct reg_window)),
104 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
108 /* Free all resources held by a thread. */
109 #define release_thread(tsk) do { } while(0)
110 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
112 /* Prepare to copy thread state - unlazy all lazy status */
113 #define prepare_to_copy(tsk) do { } while (0)
115 extern unsigned long get_wchan(struct task_struct *);
117 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
118 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
122 extern struct task_struct *last_task_used_math;
124 #define cpu_relax() barrier()
128 #endif /* __ASM_SPARC_PROCESSOR_H */