diff options
Diffstat (limited to 'arch/sh/kernel/process.c')
| -rw-r--r-- | arch/sh/kernel/process.c | 541 |
1 files changed, 46 insertions, 495 deletions
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c index 6dce9d0b81f..53bc6c4c84e 100644 --- a/arch/sh/kernel/process.c +++ b/arch/sh/kernel/process.c @@ -1,525 +1,76 @@ -/* $Id: process.c,v 1.28 2004/05/05 16:54:23 lethal Exp $ - * - * linux/arch/sh/kernel/process.c - * - * Copyright (C) 1995 Linus Torvalds - * - * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima - */ - -/* - * This file handles the architecture-dependent parts of process handling.. - */ - -#include <linux/module.h> -#include <linux/unistd.h> #include <linux/mm.h> -#include <linux/elfcore.h> +#include <linux/kernel.h> #include <linux/slab.h> -#include <linux/a.out.h> -#include <linux/ptrace.h> -#include <linux/platform.h> -#include <linux/kallsyms.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/mmu_context.h> -#include <asm/elf.h> -#if defined(CONFIG_SH_HS7751RVOIP) -#include <asm/hs7751rvoip/hs7751rvoip.h> -#elif defined(CONFIG_SH_RTS7751R2D) -#include <asm/rts7751r2d/rts7751r2d.h> -#endif - -static int hlt_counter=0; - -int ubc_usercnt = 0; - -#define HARD_IDLE_TIMEOUT (HZ / 3) +#include <linux/sched.h> +#include <linux/export.h> +#include <linux/stackprotector.h> +#include <asm/fpu.h> -void disable_hlt(void) -{ - hlt_counter++; -} - -EXPORT_SYMBOL(disable_hlt); - -void enable_hlt(void) -{ - hlt_counter--; -} - -EXPORT_SYMBOL(enable_hlt); - -void default_idle(void) -{ - /* endless idle loop with no priority at all */ - while (1) { - if (hlt_counter) { - while (1) - if (need_resched()) - break; - } else { - while (!need_resched()) - cpu_sleep(); - } - - schedule(); - } -} - -void cpu_idle(void) -{ - default_idle(); -} - -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) -{ -#if defined(CONFIG_SH_HS7751RVOIP) - unsigned short value; - - value = ctrl_inw(PA_OUTPORTR); - ctrl_outw((value & 0xffdf), PA_OUTPORTR); -#elif defined(CONFIG_SH_RTS7751R2D) - ctrl_outw(0x0001, PA_POWOFF); -#endif - while (1) - cpu_sleep(); -} - -void machine_power_off(void) -{ -#if defined(CONFIG_SH_HS7751RVOIP) - unsigned short value; - - value = ctrl_inw(PA_OUTPORTR); - ctrl_outw((value & 0xffdf), PA_OUTPORTR); -#elif defined(CONFIG_SH_RTS7751R2D) - ctrl_outw(0x0001, PA_POWOFF); -#endif -} +struct kmem_cache *task_xstate_cachep = NULL; +unsigned int xstate_size; -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", regs->pc); - 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(" "); +#ifdef CONFIG_CC_STACKPROTECTOR +unsigned long __stack_chk_guard __read_mostly; +EXPORT_SYMBOL(__stack_chk_guard); #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); - - /* - * If we're in kernel mode, dump the stack too.. - */ - if (!user_mode(regs)) { - extern void show_task(unsigned long *sp); - unsigned long sp = regs->regs[15]; - - show_task((unsigned long *)sp); - } -} - -/* - * 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"); - -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) -{ /* Don't use this in BL=1(cli). Or else, CPU resets! */ - 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.. + * this gets called so that we can store lazy state into memory and copy the + * current task into the new thread. */ -void exit_thread(void) +int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) { - 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; - struct pt_regs *regs = (struct pt_regs *) - ((unsigned long)tsk->thread_info - + THREAD_SIZE - sizeof(struct pt_regs) - - sizeof(unsigned long)); - - /* Forget lazy FPU state */ - clear_fpu(tsk, regs); - clear_used_math(); +#ifdef CONFIG_SUPERH32 + unlazy_fpu(src, task_pt_regs(src)); #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)); + *dst = *src; + + 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); } -#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 = *(struct pt_regs *) - ((unsigned long)tsk->thread_info + THREAD_SIZE - - sizeof(struct pt_regs) -#ifdef CONFIG_SH_DSP - - sizeof(struct pt_dspregs) -#endif - - sizeof(unsigned long)); - elf_core_copy_regs(regs, &ptregs); - - return 1; + return 0; } -int -dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *fpu) +void free_thread_xstate(struct task_struct *tsk) { - int fpvalid = 0; - -#if defined(CONFIG_SH_FPU) - fpvalid = !!tsk_used_math(tsk); - if (fpvalid) { - struct pt_regs *regs = (struct pt_regs *) - ((unsigned long)tsk->thread_info - + THREAD_SIZE - sizeof(struct pt_regs) - - sizeof(unsigned long)); - 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; } -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 arch_release_task_struct(struct task_struct *tsk) { - 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 = ((struct pt_regs *) - (THREAD_SIZE + (unsigned long) p->thread_info) -#ifdef CONFIG_SH_DSP - - sizeof(struct pt_dspregs) -#endif - - sizeof(unsigned long)) - 1; - *childregs = *regs; - - if (user_mode(regs)) { - childregs->regs[15] = usp; - } else { - childregs->regs[15] = (unsigned long)p->thread_info + THREAD_SIZE; - } - 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(tsk); } -/* - * fill in the user structure for a core dump.. - */ -void dump_thread(struct pt_regs * regs, struct user * dump) +void arch_task_cache_init(void) { - dump->magic = CMAGIC; - dump->start_code = current->mm->start_code; - dump->start_data = current->mm->start_data; - dump->start_stack = regs->regs[15] & ~(PAGE_SIZE - 1); - dump->u_tsize = (current->mm->end_code - dump->start_code) >> PAGE_SHIFT; - dump->u_dsize = (current->mm->brk + (PAGE_SIZE-1) - dump->start_data) >> PAGE_SHIFT; - dump->u_ssize = (current->mm->start_stack - dump->start_stack + - PAGE_SIZE - 1) >> PAGE_SHIFT; - /* Debug registers will come here. */ - - dump->regs = *regs; + if (!xstate_size) + return; - dump->u_fpvalid = dump_fpu(regs, &dump->fpu); -} - -/* Tracing by user break controller. */ -static void -ubc_set_tracing(int asid, unsigned long pc) -{ - ctrl_outl(pc, UBC_BARA); - - /* We don't have any ASID settings for the SH-2! */ - if (cpu_data->type != CPU_SH7604) - ctrl_outb(asid, UBC_BASRA); - - ctrl_outl(0, UBC_BAMRA); - - if (cpu_data->type == CPU_SH7729) { - 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); - } + task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size, + __alignof__(union thread_xstate), + SLAB_PANIC | SLAB_NOTRACK, 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) - struct pt_regs *regs = (struct pt_regs *) - ((unsigned long)prev->thread_info - + THREAD_SIZE - sizeof(struct pt_regs) - - sizeof(unsigned long)); - unlazy_fpu(prev, regs); -#endif - -#ifdef CONFIG_PREEMPT - { - unsigned long flags; - struct pt_regs *regs; - - local_irq_save(flags); - regs = (struct pt_regs *) - ((unsigned long)prev->thread_info - + THREAD_SIZE - sizeof(struct pt_regs) -#ifdef CONFIG_SH_DSP - - sizeof(struct pt_dspregs) -#endif - - sizeof(unsigned long)); - 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 - - /* - * Restore the kernel mode register - * k7 (r7_bank1) - */ - asm volatile("ldc %0, r7_bank" - : /* no output */ - : "r" (next->thread_info)); - -#ifdef CONFIG_MMU - /* 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) { - ubc_set_tracing(next->mm->context & MMU_CONTEXT_ASID_MASK, - next->thread.ubc_pc); - } 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 - return do_fork(SIGCHLD, regs.regs[15], ®s, 0, NULL, NULL); +#ifdef CONFIG_SH_FPU_EMU +# define HAVE_SOFTFP 1 #else - /* fork almost works, enough to trick you into looking elsewhere :-( */ - return -EINVAL; +# define HAVE_SOFTFP 0 #endif -} - -asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, - unsigned long parent_tidptr, - unsigned long child_tidptr, - struct pt_regs regs) -{ - if (!newsp) - newsp = regs.regs[15]; - return do_fork(clone_flags, newsp, ®s, 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) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.regs[15], ®s, - 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) -{ - 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, - ®s); - 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 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 *)(long)p->thread.sp)[1]; - return (unsigned long)((unsigned long *)schedule_frame)[1]; - } - return pc; -} - -asmlinkage void break_point_trap(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs regs) -{ - /* Clear tracing. */ - ctrl_outw(0, UBC_BBRA); - ctrl_outw(0, UBC_BBRB); - current->thread.ubc_pc = 0; - ubc_usercnt -= 1; - - force_sig(SIGTRAP, current); -} -asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs regs) +void init_thread_xstate(void) { - regs.pc -= 2; - 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; } |