diff options
Diffstat (limited to 'arch/sh/kernel/process.c')
| -rw-r--r-- | arch/sh/kernel/process.c | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c new file mode 100644 index 000000000000..3d024590c24e --- /dev/null +++ b/arch/sh/kernel/process.c @@ -0,0 +1,531 @@ +/* $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/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) + +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)); +} + +EXPORT_SYMBOL(machine_restart); + +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(); +} + +EXPORT_SYMBOL(machine_halt); + +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 +} + +EXPORT_SYMBOL(machine_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", 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(" "); +#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.. + */ +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; + 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(); +#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 = *(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; +} + +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) { + 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)); + } +#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 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; +} + +/* + * fill in the user structure for a core dump.. + */ +void dump_thread(struct pt_regs * regs, struct user * dump) +{ + 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; + + 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); + } +} + +/* + * 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); +#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) +{ + 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) +{ + regs.pc -= 2; + force_sig(SIGTRAP, current); +} |