diff options
Diffstat (limited to 'arch/sh/kernel/process.c')
| -rw-r--r-- | arch/sh/kernel/process.c | 558 |
1 files changed, 0 insertions, 558 deletions
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c deleted file mode 100644 index 6d7f2b07e491..000000000000 --- a/arch/sh/kernel/process.c +++ /dev/null @@ -1,558 +0,0 @@ -/* - * 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 <linux/tick.h> -#include <linux/reboot.h> -#include <linux/fs.h> -#include <linux/preempt.h> -#include <asm/uaccess.h> -#include <asm/mmu_context.h> -#include <asm/pgalloc.h> -#include <asm/system.h> -#include <asm/ubc.h> - -static int hlt_counter; -int ubc_usercnt = 0; - -void (*pm_idle)(void); -void (*pm_power_off)(void); -EXPORT_SYMBOL(pm_power_off); - -void disable_hlt(void) -{ - hlt_counter++; -} -EXPORT_SYMBOL(disable_hlt); - -void enable_hlt(void) -{ - hlt_counter--; -} -EXPORT_SYMBOL(enable_hlt); - -static int __init nohlt_setup(char *__unused) -{ - hlt_counter = 1; - return 1; -} -__setup("nohlt", nohlt_setup); - -static int __init hlt_setup(char *__unused) -{ - hlt_counter = 0; - return 1; -} -__setup("hlt", hlt_setup); - -void default_idle(void) -{ - if (!hlt_counter) { - clear_thread_flag(TIF_POLLING_NRFLAG); - smp_mb__after_clear_bit(); - set_bl_bit(); - while (!need_resched()) - cpu_sleep(); - clear_bl_bit(); - set_thread_flag(TIF_POLLING_NRFLAG); - } else - while (!need_resched()) - cpu_relax(); -} - -void cpu_idle(void) -{ - set_thread_flag(TIF_POLLING_NRFLAG); - - /* endless idle loop with no priority at all */ - while (1) { - void (*idle)(void) = pm_idle; - - if (!idle) - idle = default_idle; - - tick_nohz_stop_sched_tick(); - while (!need_resched()) - idle(); - tick_nohz_restart_sched_tick(); - - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - check_pgt_cache(); - } -} - -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", task_pid_nr(current), 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 */ -} - -/* Fill in the fpu structure for a core dump.. */ -int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) -{ - 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)); - } -#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; -} - -int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpu) -{ - int fpvalid = 0; - -#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)); - } -#endif - - return fpvalid; -} - -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) -{ - 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; -} - -/* Tracing by user break controller. */ -static void ubc_set_tracing(int asid, unsigned long pc) -{ -#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 - 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 */ -} - -/* - * 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 - -#if defined(CONFIG_GUSA) && defined(CONFIG_PREEMPT) - { - struct pt_regs *regs; - - preempt_disable(); - 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; - } - preempt_enable_no_resched(); - } -#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) -{ -#ifdef CONFIG_MMU - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); - return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); -#else - /* fork almost works, enough to trick you into looking elsewhere :-( */ - return -EINVAL; -#endif -} - -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) -{ - 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 __user *ufilename, char __user * __user *uargv, - char __user * __user *uenvp, unsigned long r7, - struct pt_regs __regs) -{ - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); - int error; - char *filename; - - filename = getname(ufilename); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - - error = do_execve(filename, uargv, uenvp, regs); - if (error == 0) { - task_lock(current); - current->ptrace &= ~PT_DTRACE; - task_unlock(current); - } - putname(filename); -out: - return error; -} - -unsigned long get_wchan(struct task_struct *p) -{ - 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); - -#ifdef CONFIG_FRAME_POINTER - if (in_sched_functions(pc)) { - unsigned long schedule_frame = (unsigned long)p->thread.sp; - return ((unsigned long *)schedule_frame)[21]; - } -#endif - - return pc; -} - -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); -#else - ctrl_outw(0, UBC_BBRA); - ctrl_outw(0, UBC_BBRB); -#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) -{ - 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); -} |