ec0d7f18ab
Pull fpu state cleanups from Ingo Molnar: "This tree streamlines further aspects of FPU handling by eliminating the prepare_to_copy() complication and moving that logic to arch_dup_task_struct(). It also fixes the FPU dumps in threaded core dumps, removes and old (and now invalid) assumption plus micro-optimizes the exit path by avoiding an FPU save for dead tasks." Fixed up trivial add-add conflict in arch/sh/kernel/process.c that came in because we now do the FPU handling in arch_dup_task_struct() rather than the legacy (and now gone) prepare_to_copy(). * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, fpu: drop the fpu state during thread exit x86, xsave: remove thread_has_fpu() bug check in __sanitize_i387_state() coredump: ensure the fpu state is flushed for proper multi-threaded core dump fork: move the real prepare_to_copy() users to arch_dup_task_struct()
125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/* include/asm/processor.h
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*
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* Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef __ASM_SPARC_PROCESSOR_H
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#define __ASM_SPARC_PROCESSOR_H
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/*
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* Sparc32 implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
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#include <asm/psr.h>
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#include <asm/ptrace.h>
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#include <asm/head.h>
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#include <asm/signal.h>
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#include <asm/page.h>
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/*
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* The sparc has no problems with write protection
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*/
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#define wp_works_ok 1
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#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
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/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
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* That one page is used to protect kernel from intruders, so that
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* we can make our access_ok test faster
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*/
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#define TASK_SIZE PAGE_OFFSET
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#ifdef __KERNEL__
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#define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
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#define STACK_TOP_MAX STACK_TOP
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#endif /* __KERNEL__ */
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struct task_struct;
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#ifdef __KERNEL__
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struct fpq {
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unsigned long *insn_addr;
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unsigned long insn;
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};
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#endif
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typedef struct {
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int seg;
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} mm_segment_t;
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/* The Sparc processor specific thread struct. */
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struct thread_struct {
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struct pt_regs *kregs;
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unsigned int _pad1;
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/* Special child fork kpsr/kwim values. */
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unsigned long fork_kpsr __attribute__ ((aligned (8)));
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unsigned long fork_kwim;
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/* Floating point regs */
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unsigned long float_regs[32] __attribute__ ((aligned (8)));
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unsigned long fsr;
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unsigned long fpqdepth;
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struct fpq fpqueue[16];
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unsigned long flags;
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mm_segment_t current_ds;
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};
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#define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
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#define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
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#define INIT_THREAD { \
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.flags = SPARC_FLAG_KTHREAD, \
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.current_ds = KERNEL_DS, \
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}
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/* Return saved PC of a blocked thread. */
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extern unsigned long thread_saved_pc(struct task_struct *t);
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/* Do necessary setup to start up a newly executed thread. */
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static inline void start_thread(struct pt_regs * regs, unsigned long pc,
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unsigned long sp)
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{
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register unsigned long zero asm("g1");
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regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
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regs->pc = ((pc & (~3)) - 4);
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regs->npc = regs->pc + 4;
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regs->y = 0;
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zero = 0;
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__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
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"std\t%%g0, [%0 + %3 + 0x08]\n\t"
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"std\t%%g0, [%0 + %3 + 0x10]\n\t"
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"std\t%%g0, [%0 + %3 + 0x18]\n\t"
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"std\t%%g0, [%0 + %3 + 0x20]\n\t"
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"std\t%%g0, [%0 + %3 + 0x28]\n\t"
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"std\t%%g0, [%0 + %3 + 0x30]\n\t"
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"st\t%1, [%0 + %3 + 0x38]\n\t"
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"st\t%%g0, [%0 + %3 + 0x3c]"
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: /* no outputs */
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: "r" (regs),
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"r" (sp - sizeof(struct reg_window32)),
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"r" (zero),
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"i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
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: "memory");
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}
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/* Free all resources held by a thread. */
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#define release_thread(tsk) do { } while(0)
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extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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extern unsigned long get_wchan(struct task_struct *);
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#define task_pt_regs(tsk) ((tsk)->thread.kregs)
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#define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
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#define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
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#ifdef __KERNEL__
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extern struct task_struct *last_task_used_math;
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#define cpu_relax() barrier()
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#endif
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#endif /* __ASM_SPARC_PROCESSOR_H */
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