/* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $ * include/asm-sparc/processor.h * * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu) */ #ifndef __ASM_SPARC_PROCESSOR_H #define __ASM_SPARC_PROCESSOR_H /* * Sparc32 implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; }) #include <linux/a.out.h> #include <asm/psr.h> #include <asm/ptrace.h> #include <asm/head.h> #include <asm/signal.h> #include <asm/btfixup.h> #include <asm/page.h> /* * The sparc has no problems with write protection */ #define wp_works_ok 1 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */ /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too... * That one page is used to protect kernel from intruders, so that * we can make our access_ok test faster */ #define TASK_SIZE PAGE_OFFSET struct task_struct; #ifdef __KERNEL__ struct fpq { unsigned long *insn_addr; unsigned long insn; }; #endif typedef struct { int seg; } mm_segment_t; /* The Sparc processor specific thread struct. */ struct thread_struct { struct pt_regs *kregs; unsigned int _pad1; /* Special child fork kpsr/kwim values. */ unsigned long fork_kpsr __attribute__ ((aligned (8))); unsigned long fork_kwim; /* Floating point regs */ unsigned long float_regs[32] __attribute__ ((aligned (8))); unsigned long fsr; unsigned long fpqdepth; struct fpq fpqueue[16]; unsigned long flags; mm_segment_t current_ds; struct exec core_exec; /* just what it says. */ int new_signal; }; #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */ #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */ #define INIT_THREAD { \ .flags = SPARC_FLAG_KTHREAD, \ .current_ds = KERNEL_DS, \ } /* Return saved PC of a blocked thread. */ extern unsigned long thread_saved_pc(struct task_struct *t); /* Do necessary setup to start up a newly executed thread. */ static inline void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) { register unsigned long zero asm("g1"); regs->psr = (regs->psr & (PSR_CWP)) | PSR_S; regs->pc = ((pc & (~3)) - 4); regs->npc = regs->pc + 4; regs->y = 0; zero = 0; __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t" "std\t%%g0, [%0 + %3 + 0x08]\n\t" "std\t%%g0, [%0 + %3 + 0x10]\n\t" "std\t%%g0, [%0 + %3 + 0x18]\n\t" "std\t%%g0, [%0 + %3 + 0x20]\n\t" "std\t%%g0, [%0 + %3 + 0x28]\n\t" "std\t%%g0, [%0 + %3 + 0x30]\n\t" "st\t%1, [%0 + %3 + 0x38]\n\t" "st\t%%g0, [%0 + %3 + 0x3c]" : /* no outputs */ : "r" (regs), "r" (sp - sizeof(struct reg_window)), "r" (zero), "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])) : "memory"); } /* Free all resources held by a thread. */ #define release_thread(tsk) do { } while(0) extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); /* Prepare to copy thread state - unlazy all lazy status */ #define prepare_to_copy(tsk) do { } while (0) extern unsigned long get_wchan(struct task_struct *); #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc) #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP]) #ifdef __KERNEL__ extern struct task_struct *last_task_used_math; #define cpu_relax() barrier() #endif #endif /* __ASM_SPARC_PROCESSOR_H */