-/*
- * arch/sh/kernel/process.c
- *
- * This file handles the architecture-dependent parts of process handling..
- *
- * Copyright (C) 1995 Linus Torvalds
- *
- * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
- * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
- * Copyright (C) 2002 - 2007 Paul Mundt
- */
-#include <linux/module.h>
#include <linux/mm.h>
-#include <linux/elfcore.h>
-#include <linux/pm.h>
-#include <linux/kallsyms.h>
-#include <linux/kexec.h>
-#include <linux/kdebug.h>
-#include <asm/uaccess.h>
-#include <asm/mmu_context.h>
-#include <asm/pgalloc.h>
-#include <asm/system.h>
-#include <asm/ubc.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
-static int hlt_counter;
-int ubc_usercnt = 0;
+struct kmem_cache *task_xstate_cachep = NULL;
+unsigned int xstate_size;
-#define HARD_IDLE_TIMEOUT (HZ / 3)
-
-void (*pm_idle)(void);
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
-void disable_hlt(void)
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
- hlt_counter++;
-}
-EXPORT_SYMBOL(disable_hlt);
+ *dst = *src;
-void enable_hlt(void)
-{
- hlt_counter--;
-}
-EXPORT_SYMBOL(enable_hlt);
-
-void default_idle(void)
-{
- if (!hlt_counter)
- cpu_sleep();
- else
- cpu_relax();
-}
-
-void cpu_idle(void)
-{
- /* endless idle loop with no priority at all */
- while (1) {
- void (*idle)(void) = pm_idle;
-
- if (!idle)
- idle = default_idle;
-
- while (!need_resched())
- idle();
-
- preempt_enable_no_resched();
- schedule();
- preempt_disable();
- check_pgt_cache();
+ if (src->thread.xstate) {
+ dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+ GFP_KERNEL);
+ if (!dst->thread.xstate)
+ return -ENOMEM;
+ memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
}
-}
-
-void machine_restart(char * __unused)
-{
- /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
- asm volatile("ldc %0, sr\n\t"
- "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
-}
-
-void machine_halt(void)
-{
- local_irq_disable();
-
- while (1)
- cpu_sleep();
-}
-
-void machine_power_off(void)
-{
- if (pm_power_off)
- pm_power_off();
-}
-
-void show_regs(struct pt_regs * regs)
-{
- printk("\n");
- printk("Pid : %d, Comm: %20s\n", current->pid, current->comm);
- print_symbol("PC is at %s\n", instruction_pointer(regs));
- printk("PC : %08lx SP : %08lx SR : %08lx ",
- regs->pc, regs->regs[15], regs->sr);
-#ifdef CONFIG_MMU
- printk("TEA : %08x ", ctrl_inl(MMU_TEA));
-#else
- printk(" ");
-#endif
- printk("%s\n", print_tainted());
-
- printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
- regs->regs[0],regs->regs[1],
- regs->regs[2],regs->regs[3]);
- printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
- regs->regs[4],regs->regs[5],
- regs->regs[6],regs->regs[7]);
- printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n",
- regs->regs[8],regs->regs[9],
- regs->regs[10],regs->regs[11]);
- printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
- regs->regs[12],regs->regs[13],
- regs->regs[14]);
- printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n",
- regs->mach, regs->macl, regs->gbr, regs->pr);
-
- show_trace(NULL, (unsigned long *)regs->regs[15], regs);
-}
-
-/*
- * Create a kernel thread
- */
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- */
-extern void kernel_thread_helper(void);
-__asm__(".align 5\n"
- "kernel_thread_helper:\n\t"
- "jsr @r5\n\t"
- " nop\n\t"
- "mov.l 1f, r1\n\t"
- "jsr @r1\n\t"
- " mov r0, r4\n\t"
- ".align 2\n\t"
- "1:.long do_exit");
-
-/* Don't use this in BL=1(cli). Or else, CPU resets! */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- regs.regs[4] = (unsigned long)arg;
- regs.regs[5] = (unsigned long)fn;
-
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.sr = (1 << 30);
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- ®s, 0, NULL, NULL);
-}
-
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
- if (current->thread.ubc_pc) {
- current->thread.ubc_pc = 0;
- ubc_usercnt -= 1;
- }
-}
-
-void flush_thread(void)
-{
-#if defined(CONFIG_SH_FPU)
- struct task_struct *tsk = current;
- /* Forget lazy FPU state */
- clear_fpu(tsk, task_pt_regs(tsk));
- clear_used_math();
-#endif
-}
-
-void release_thread(struct task_struct *dead_task)
-{
- /* do nothing */
+ return 0;
}
-/* Fill in the fpu structure for a core dump.. */
-int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
+void free_thread_xstate(struct task_struct *tsk)
{
- int fpvalid = 0;
-
-#if defined(CONFIG_SH_FPU)
- struct task_struct *tsk = current;
-
- fpvalid = !!tsk_used_math(tsk);
- if (fpvalid) {
- unlazy_fpu(tsk, regs);
- memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
+ if (tsk->thread.xstate) {
+ kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
+ tsk->thread.xstate = NULL;
}
-#endif
-
- return fpvalid;
}
-/*
- * Capture the user space registers if the task is not running (in user space)
- */
-int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
-{
- struct pt_regs ptregs;
-
- ptregs = *task_pt_regs(tsk);
- elf_core_copy_regs(regs, &ptregs);
-
- return 1;
-}
+#if THREAD_SHIFT < PAGE_SHIFT
+static struct kmem_cache *thread_info_cache;
-int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpu)
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
{
- int fpvalid = 0;
+ struct thread_info *ti;
-#if defined(CONFIG_SH_FPU)
- fpvalid = !!tsk_used_math(tsk);
- if (fpvalid) {
- unlazy_fpu(tsk, task_pt_regs(tsk));
- memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
- }
+ ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
+ if (unlikely(ti == NULL))
+ return NULL;
+#ifdef CONFIG_DEBUG_STACK_USAGE
+ memset(ti, 0, THREAD_SIZE);
#endif
-
- return fpvalid;
+ return ti;
}
-asmlinkage void ret_from_fork(void);
-
-int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
- struct task_struct *p, struct pt_regs *regs)
+void free_thread_info(struct thread_info *ti)
{
- struct thread_info *ti = task_thread_info(p);
- struct pt_regs *childregs;
-#if defined(CONFIG_SH_FPU)
- struct task_struct *tsk = current;
-
- unlazy_fpu(tsk, regs);
- p->thread.fpu = tsk->thread.fpu;
- copy_to_stopped_child_used_math(p);
-#endif
-
- childregs = task_pt_regs(p);
- *childregs = *regs;
-
- if (user_mode(regs)) {
- childregs->regs[15] = usp;
- ti->addr_limit = USER_DS;
- } else {
- childregs->regs[15] = (unsigned long)childregs;
- ti->addr_limit = KERNEL_DS;
- }
-
- if (clone_flags & CLONE_SETTLS)
- childregs->gbr = childregs->regs[0];
-
- childregs->regs[0] = 0; /* Set return value for child */
-
- p->thread.sp = (unsigned long) childregs;
- p->thread.pc = (unsigned long) ret_from_fork;
-
- p->thread.ubc_pc = 0;
-
- return 0;
+ free_thread_xstate(ti->task);
+ kmem_cache_free(thread_info_cache, ti);
}
-/* Tracing by user break controller. */
-static void ubc_set_tracing(int asid, unsigned long pc)
+void thread_info_cache_init(void)
{
-#if defined(CONFIG_CPU_SH4A)
- unsigned long val;
-
- val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE);
- val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid));
-
- ctrl_outl(val, UBC_CBR0);
- ctrl_outl(pc, UBC_CAR0);
- ctrl_outl(0x0, UBC_CAMR0);
- ctrl_outl(0x0, UBC_CBCR);
-
- val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE);
- ctrl_outl(val, UBC_CRR0);
-
- /* Read UBC register that we wrote last, for checking update */
- val = ctrl_inl(UBC_CRR0);
-
-#else /* CONFIG_CPU_SH4A */
- ctrl_outl(pc, UBC_BARA);
-
-#ifdef CONFIG_MMU
- /* We don't have any ASID settings for the SH-2! */
- if (current_cpu_data.type != CPU_SH7604)
- ctrl_outb(asid, UBC_BASRA);
-#endif
-
- ctrl_outl(0, UBC_BAMRA);
-
- if (current_cpu_data.type == CPU_SH7729 ||
- current_cpu_data.type == CPU_SH7710 ||
- current_cpu_data.type == CPU_SH7712) {
- ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA);
- ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR);
- } else {
- ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA);
- ctrl_outw(BRCR_PCBA, UBC_BRCR);
- }
-#endif /* CONFIG_CPU_SH4A */
+ thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+ THREAD_SIZE, SLAB_PANIC, NULL);
}
-
-/*
- * switch_to(x,y) should switch tasks from x to y.
- *
- */
-struct task_struct *__switch_to(struct task_struct *prev,
- struct task_struct *next)
-{
-#if defined(CONFIG_SH_FPU)
- unlazy_fpu(prev, task_pt_regs(prev));
-#endif
-
-#ifdef CONFIG_PREEMPT
- {
- unsigned long flags;
- struct pt_regs *regs;
-
- local_irq_save(flags);
- regs = task_pt_regs(prev);
- if (user_mode(regs) && regs->regs[15] >= 0xc0000000) {
- int offset = (int)regs->regs[15];
-
- /* Reset stack pointer: clear critical region mark */
- regs->regs[15] = regs->regs[1];
- if (regs->pc < regs->regs[0])
- /* Go to rewind point */
- regs->pc = regs->regs[0] + offset;
- }
- local_irq_restore(flags);
- }
-#endif
-
-#ifdef CONFIG_MMU
- /*
- * Restore the kernel mode register
- * k7 (r7_bank1)
- */
- asm volatile("ldc %0, r7_bank"
- : /* no output */
- : "r" (task_thread_info(next)));
-#endif
-
- /* If no tasks are using the UBC, we're done */
- if (ubc_usercnt == 0)
- /* If no tasks are using the UBC, we're done */;
- else if (next->thread.ubc_pc && next->mm) {
- int asid = 0;
-#ifdef CONFIG_MMU
- asid |= cpu_asid(smp_processor_id(), next->mm);
-#endif
- ubc_set_tracing(asid, next->thread.ubc_pc);
- } else {
-#if defined(CONFIG_CPU_SH4A)
- ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
- ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
#else
- ctrl_outw(0, UBC_BBRA);
- ctrl_outw(0, UBC_BBRB);
-#endif
- }
-
- return prev;
-}
-
-asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-#ifdef CONFIG_MMU
- return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
+#ifdef CONFIG_DEBUG_STACK_USAGE
+ gfp_t mask = GFP_KERNEL | __GFP_ZERO;
#else
- /* fork almost works, enough to trick you into looking elsewhere :-( */
- return -EINVAL;
+ gfp_t mask = GFP_KERNEL;
#endif
+ return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER);
}
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
- unsigned long parent_tidptr,
- unsigned long child_tidptr,
- struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- if (!newsp)
- newsp = regs->regs[15];
- return do_fork(clone_flags, newsp, regs, 0,
- (int __user *)parent_tidptr,
- (int __user *)child_tidptr);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
+void free_thread_info(struct thread_info *ti)
{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs,
- 0, NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(char *ufilename, char **uargv,
- char **uenvp, unsigned long r7,
- struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- int error;
- char *filename;
-
- filename = getname((char __user *)ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename,
- (char __user * __user *)uargv,
- (char __user * __user *)uenvp,
- regs);
- if (error == 0) {
- task_lock(current);
- current->ptrace &= ~PT_DTRACE;
- task_unlock(current);
- }
- putname(filename);
-out:
- return error;
+ free_thread_xstate(ti->task);
+ free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
}
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
-unsigned long get_wchan(struct task_struct *p)
+void arch_task_cache_init(void)
{
- unsigned long schedule_frame;
- unsigned long pc;
-
- if (!p || p == current || p->state == TASK_RUNNING)
- return 0;
-
- /*
- * The same comment as on the Alpha applies here, too ...
- */
- pc = thread_saved_pc(p);
- if (in_sched_functions(pc)) {
- schedule_frame = (unsigned long)p->thread.sp;
- return ((unsigned long *)schedule_frame)[21];
- }
+ if (!xstate_size)
+ return;
- return pc;
+ task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
+ __alignof__(union thread_xstate),
+ SLAB_PANIC | SLAB_NOTRACK, NULL);
}
-asmlinkage void break_point_trap(void)
-{
- /* Clear tracing. */
-#if defined(CONFIG_CPU_SH4A)
- ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
- ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
+#ifdef CONFIG_SH_FPU_EMU
+# define HAVE_SOFTFP 1
#else
- ctrl_outw(0, UBC_BBRA);
- ctrl_outw(0, UBC_BBRB);
+# define HAVE_SOFTFP 0
#endif
- current->thread.ubc_pc = 0;
- ubc_usercnt -= 1;
-
- force_sig(SIGTRAP, current);
-}
-
-/*
- * Generic trap handler.
- */
-asmlinkage void debug_trap_handler(unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-
- /* Rewind */
- regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
-
- if (notify_die(DIE_TRAP, "debug trap", regs, 0, regs->tra & 0xff,
- SIGTRAP) == NOTIFY_STOP)
- return;
-
- force_sig(SIGTRAP, current);
-}
-/*
- * Special handler for BUG() traps.
- */
-asmlinkage void bug_trap_handler(unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
+void init_thread_xstate(void)
{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-
- /* Rewind */
- regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
-
- if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
- SIGTRAP) == NOTIFY_STOP)
- return;
-
-#ifdef CONFIG_BUG
- if (__kernel_text_address(instruction_pointer(regs))) {
- u16 insn = *(u16 *)instruction_pointer(regs);
- if (insn == TRAPA_BUG_OPCODE)
- handle_BUG(regs);
- }
-#endif
-
- force_sig(SIGTRAP, current);
+ if (boot_cpu_data.flags & CPU_HAS_FPU)
+ xstate_size = sizeof(struct sh_fpu_hard_struct);
+ else if (HAVE_SOFTFP)
+ xstate_size = sizeof(struct sh_fpu_soft_struct);
+ else
+ xstate_size = 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff