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Diffstat (limited to '')
| -rw-r--r-- | include/asm-sparc/processor_32.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/include/asm-sparc/processor_32.h b/include/asm-sparc/processor_32.h new file mode 100644 index 000000000000..562c0d69c537 --- /dev/null +++ b/include/asm-sparc/processor_32.h @@ -0,0 +1,128 @@ +/* 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 <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 +#ifdef __KERNEL__ +#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE) +#define STACK_TOP_MAX STACK_TOP +#endif /* __KERNEL__ */ + +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; +}; + +#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 */ |