diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/process_32.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/kernel/process_32.c | 336 |
1 files changed, 0 insertions, 336 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/process_32.c b/ANDROID_3.4.5/arch/x86/kernel/process_32.c deleted file mode 100644 index ae684730..00000000 --- a/ANDROID_3.4.5/arch/x86/kernel/process_32.c +++ /dev/null @@ -1,336 +0,0 @@ -/* - * Copyright (C) 1995 Linus Torvalds - * - * Pentium III FXSR, SSE support - * Gareth Hughes <gareth@valinux.com>, May 2000 - */ - -/* - * This file handles the architecture-dependent parts of process handling.. - */ - -#include <linux/cpu.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/fs.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/elfcore.h> -#include <linux/smp.h> -#include <linux/stddef.h> -#include <linux/slab.h> -#include <linux/vmalloc.h> -#include <linux/user.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/mc146818rtc.h> -#include <linux/module.h> -#include <linux/kallsyms.h> -#include <linux/ptrace.h> -#include <linux/personality.h> -#include <linux/percpu.h> -#include <linux/prctl.h> -#include <linux/ftrace.h> -#include <linux/uaccess.h> -#include <linux/io.h> -#include <linux/kdebug.h> - -#include <asm/pgtable.h> -#include <asm/ldt.h> -#include <asm/processor.h> -#include <asm/i387.h> -#include <asm/fpu-internal.h> -#include <asm/desc.h> -#ifdef CONFIG_MATH_EMULATION -#include <asm/math_emu.h> -#endif - -#include <linux/err.h> - -#include <asm/tlbflush.h> -#include <asm/cpu.h> -#include <asm/idle.h> -#include <asm/syscalls.h> -#include <asm/debugreg.h> -#include <asm/switch_to.h> - -asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); - -/* - * Return saved PC of a blocked thread. - */ -unsigned long thread_saved_pc(struct task_struct *tsk) -{ - return ((unsigned long *)tsk->thread.sp)[3]; -} - -void __show_regs(struct pt_regs *regs, int all) -{ - unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L; - unsigned long d0, d1, d2, d3, d6, d7; - unsigned long sp; - unsigned short ss, gs; - - if (user_mode_vm(regs)) { - sp = regs->sp; - ss = regs->ss & 0xffff; - gs = get_user_gs(regs); - } else { - sp = kernel_stack_pointer(regs); - savesegment(ss, ss); - savesegment(gs, gs); - } - - show_regs_common(); - - printk(KERN_DEFAULT "EIP: %04x:[<%08lx>] EFLAGS: %08lx CPU: %d\n", - (u16)regs->cs, regs->ip, regs->flags, - smp_processor_id()); - print_symbol("EIP is at %s\n", regs->ip); - - printk(KERN_DEFAULT "EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n", - regs->ax, regs->bx, regs->cx, regs->dx); - printk(KERN_DEFAULT "ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n", - regs->si, regs->di, regs->bp, sp); - printk(KERN_DEFAULT " DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x\n", - (u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, ss); - - if (!all) - return; - - cr0 = read_cr0(); - cr2 = read_cr2(); - cr3 = read_cr3(); - cr4 = read_cr4_safe(); - printk(KERN_DEFAULT "CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", - cr0, cr2, cr3, cr4); - - get_debugreg(d0, 0); - get_debugreg(d1, 1); - get_debugreg(d2, 2); - get_debugreg(d3, 3); - printk(KERN_DEFAULT "DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n", - d0, d1, d2, d3); - - get_debugreg(d6, 6); - get_debugreg(d7, 7); - printk(KERN_DEFAULT "DR6: %08lx DR7: %08lx\n", - d6, d7); -} - -void release_thread(struct task_struct *dead_task) -{ - BUG_ON(dead_task->mm); - release_vm86_irqs(dead_task); -} - -/* - * This gets called before we allocate a new thread and copy - * the current task into it. - */ -void prepare_to_copy(struct task_struct *tsk) -{ - unlazy_fpu(tsk); -} - -int copy_thread(unsigned long clone_flags, unsigned long sp, - unsigned long unused, - struct task_struct *p, struct pt_regs *regs) -{ - struct pt_regs *childregs; - struct task_struct *tsk; - int err; - - childregs = task_pt_regs(p); - *childregs = *regs; - childregs->ax = 0; - childregs->sp = sp; - - p->thread.sp = (unsigned long) childregs; - p->thread.sp0 = (unsigned long) (childregs+1); - - p->thread.ip = (unsigned long) ret_from_fork; - - task_user_gs(p) = get_user_gs(regs); - - p->fpu_counter = 0; - p->thread.io_bitmap_ptr = NULL; - tsk = current; - err = -ENOMEM; - - memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); - - if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) { - p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr, - IO_BITMAP_BYTES, GFP_KERNEL); - if (!p->thread.io_bitmap_ptr) { - p->thread.io_bitmap_max = 0; - return -ENOMEM; - } - set_tsk_thread_flag(p, TIF_IO_BITMAP); - } - - err = 0; - - /* - * Set a new TLS for the child thread? - */ - if (clone_flags & CLONE_SETTLS) - err = do_set_thread_area(p, -1, - (struct user_desc __user *)childregs->si, 0); - - if (err && p->thread.io_bitmap_ptr) { - kfree(p->thread.io_bitmap_ptr); - p->thread.io_bitmap_max = 0; - } - return err; -} - -void -start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) -{ - set_user_gs(regs, 0); - regs->fs = 0; - regs->ds = __USER_DS; - regs->es = __USER_DS; - regs->ss = __USER_DS; - regs->cs = __USER_CS; - regs->ip = new_ip; - regs->sp = new_sp; - /* - * Free the old FP and other extended state - */ - free_thread_xstate(current); -} -EXPORT_SYMBOL_GPL(start_thread); - - -/* - * switch_to(x,y) should switch tasks from x to y. - * - * We fsave/fwait so that an exception goes off at the right time - * (as a call from the fsave or fwait in effect) rather than to - * the wrong process. Lazy FP saving no longer makes any sense - * with modern CPU's, and this simplifies a lot of things (SMP - * and UP become the same). - * - * NOTE! We used to use the x86 hardware context switching. The - * reason for not using it any more becomes apparent when you - * try to recover gracefully from saved state that is no longer - * valid (stale segment register values in particular). With the - * hardware task-switch, there is no way to fix up bad state in - * a reasonable manner. - * - * The fact that Intel documents the hardware task-switching to - * be slow is a fairly red herring - this code is not noticeably - * faster. However, there _is_ some room for improvement here, - * so the performance issues may eventually be a valid point. - * More important, however, is the fact that this allows us much - * more flexibility. - * - * The return value (in %ax) will be the "prev" task after - * the task-switch, and shows up in ret_from_fork in entry.S, - * for example. - */ -__notrace_funcgraph struct task_struct * -__switch_to(struct task_struct *prev_p, struct task_struct *next_p) -{ - struct thread_struct *prev = &prev_p->thread, - *next = &next_p->thread; - int cpu = smp_processor_id(); - struct tss_struct *tss = &per_cpu(init_tss, cpu); - fpu_switch_t fpu; - - /* never put a printk in __switch_to... printk() calls wake_up*() indirectly */ - - fpu = switch_fpu_prepare(prev_p, next_p, cpu); - - /* - * Reload esp0. - */ - load_sp0(tss, next); - - /* - * Save away %gs. No need to save %fs, as it was saved on the - * stack on entry. No need to save %es and %ds, as those are - * always kernel segments while inside the kernel. Doing this - * before setting the new TLS descriptors avoids the situation - * where we temporarily have non-reloadable segments in %fs - * and %gs. This could be an issue if the NMI handler ever - * used %fs or %gs (it does not today), or if the kernel is - * running inside of a hypervisor layer. - */ - lazy_save_gs(prev->gs); - - /* - * Load the per-thread Thread-Local Storage descriptor. - */ - load_TLS(next, cpu); - - /* - * Restore IOPL if needed. In normal use, the flags restore - * in the switch assembly will handle this. But if the kernel - * is running virtualized at a non-zero CPL, the popf will - * not restore flags, so it must be done in a separate step. - */ - if (get_kernel_rpl() && unlikely(prev->iopl != next->iopl)) - set_iopl_mask(next->iopl); - - /* - * Now maybe handle debug registers and/or IO bitmaps - */ - if (unlikely(task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV || - task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT)) - __switch_to_xtra(prev_p, next_p, tss); - - /* - * Leave lazy mode, flushing any hypercalls made here. - * This must be done before restoring TLS segments so - * the GDT and LDT are properly updated, and must be - * done before math_state_restore, so the TS bit is up - * to date. - */ - arch_end_context_switch(next_p); - - /* - * Restore %gs if needed (which is common) - */ - if (prev->gs | next->gs) - lazy_load_gs(next->gs); - - switch_fpu_finish(next_p, fpu); - - percpu_write(current_task, next_p); - - return prev_p; -} - -#define top_esp (THREAD_SIZE - sizeof(unsigned long)) -#define top_ebp (THREAD_SIZE - 2*sizeof(unsigned long)) - -unsigned long get_wchan(struct task_struct *p) -{ - unsigned long bp, sp, ip; - unsigned long stack_page; - int count = 0; - if (!p || p == current || p->state == TASK_RUNNING) - return 0; - stack_page = (unsigned long)task_stack_page(p); - sp = p->thread.sp; - if (!stack_page || sp < stack_page || sp > top_esp+stack_page) - return 0; - /* include/asm-i386/system.h:switch_to() pushes bp last. */ - bp = *(unsigned long *) sp; - do { - if (bp < stack_page || bp > top_ebp+stack_page) - return 0; - ip = *(unsigned long *) (bp+4); - if (!in_sched_functions(ip)) - return ip; - bp = *(unsigned long *) bp; - } while (count++ < 16); - return 0; -} - |