diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/process.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/process.c | 634 |
1 files changed, 0 insertions, 634 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/process.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/process.c deleted file mode 100644 index 23872fed0f..0000000000 --- a/target/linux/ubicom32/files/arch/ubicom32/kernel/process.c +++ /dev/null @@ -1,634 +0,0 @@ -/* - * arch/ubicom32/kernel/process.c - * Ubicom32 architecture-dependent process handling. - * - * (C) Copyright 2009, Ubicom, Inc. - * Copyright (C) 1995 Hamish Macdonald - * - * 68060 fixes by Jesper Skov - * - * uClinux changes - * Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com> - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port is free software: you can redistribute - * it and/or modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, either version 2 of the - * License, or (at your option) any later version. - * - * The Ubicom32 Linux Kernel Port is distributed in the hope that it - * will be useful, but WITHOUT ANY WARRANTY; without even the implied - * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - * the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with the Ubicom32 Linux Kernel Port. If not, - * see <http://www.gnu.org/licenses/>. - * - * Ubicom32 implementation derived from (with many thanks): - * arch/m68knommu - * arch/blackfin - * arch/parisc - */ - -/* - * This file handles the architecture-dependent parts of process handling.. - */ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/smp_lock.h> -#include <linux/stddef.h> -#include <linux/unistd.h> -#include <linux/ptrace.h> -#include <linux/slab.h> -#include <linux/user.h> -#include <linux/a.out.h> -#include <linux/interrupt.h> -#include <linux/reboot.h> -#include <linux/fs.h> -#include <linux/pm.h> - -#include <linux/uaccess.h> -#include <asm/system.h> -#include <asm/traps.h> -#include <asm/machdep.h> -#include <asm/setup.h> -#include <asm/pgtable.h> -#include <asm/ip5000.h> -#include <asm/range-protect.h> - -#define DUMP_RANGE_REGISTER(REG, IDX) asm volatile ( \ - " move.4 %0, "REG"_RANGE"IDX"_EN \n\t" \ - " move.4 %1, "REG"_RANGE"IDX"_LO \n\t" \ - " move.4 %2, "REG"_RANGE"IDX"_HI \n\t" \ - : "=d"(en), "=d"(lo), "=d"(hi) \ - ); \ - printk(KERN_NOTICE REG"Range"IDX": en:%08x, range: %08x-%08x\n", \ - (unsigned int)en, \ - (unsigned int)lo, \ - (unsigned int)hi) - -asmlinkage void ret_from_fork(void); - -void (*pm_power_off)(void) = machine_power_off; -EXPORT_SYMBOL(pm_power_off); - -/* machine-dependent / hardware-specific power functions */ -void (*mach_reset)(void); -void (*mach_halt)(void); -void (*mach_power_off)(void); - -/* - * cpu_idle() - * The idle thread. - * - * Our idle loop suspends and is woken up by a timer interrupt. - */ -void cpu_idle(void) -{ - while (1) { - local_irq_disable(); - while (!need_resched()) { - local_irq_enable(); - thread_suspend(); - local_irq_disable(); - } - local_irq_enable(); - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - } -} - -/* - * dump_fpu() - * - * Fill in the fpu structure for a core dump. (just a stub as we don't have - * an fpu) - */ -int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpregs) -{ - return 1; -} - -/* - * machine_restart() - * Resets the system. - */ -void machine_restart(char *__unused) -{ - /* - * Disable all threads except myself. We can do this - * directly without needing to call smp_send_stop - * because we have a unique architecture where - * one thread can disable one or more other threads. - */ - thread_disable_others(); - - /* - * Call the hardware-specific machine reset function. - */ - if (mach_reset) { - mach_reset(); - } - - printk(KERN_EMERG "System Restarting\n"); - - /* - * Set watchdog to trigger (after 1ms delay) (12 Mhz is the fixed OSC) - */ - UBICOM32_IO_TIMER->tkey = TIMER_TKEYVAL; - UBICOM32_IO_TIMER->wdcom = UBICOM32_IO_TIMER->mptval + - (12000000 / 1000); - UBICOM32_IO_TIMER->wdcfg = 0; - UBICOM32_IO_TIMER->tkey = 0; - - /* - * Wait for watchdog - */ - asm volatile ( - " move.4 MT_EN, #0 \n\t" - " pipe_flush 0 \n\t" - ); - - local_irq_disable(); - for (;;) { - thread_suspend(); - } -} - -/* - * machine_halt() - * Halt the machine. - * - * Similar to machine_power_off, but don't shut off power. Add code - * here to freeze the system for e.g. post-mortem debug purpose when - * possible. This halt has nothing to do with the idle halt. - */ -void machine_halt(void) -{ - /* - * Disable all threads except myself. We can do this - * directly without needing to call smp_send_stop - * because we have a unique architecture where - * one thread can disable one or more other threads. - */ - thread_disable_others(); - - /* - * Call the hardware-specific machine halt function. - */ - if (mach_halt) { - mach_halt(); - } - - printk(KERN_EMERG "System Halted, OK to turn off power\n"); - local_irq_disable(); - for (;;) { - thread_suspend(); - } -} - -/* - * machine_power_off() - * Turn the power off, if a power off handler is defined, otherwise, spin - * endlessly. - */ -void machine_power_off(void) -{ - /* - * Disable all threads except myself. We can do this - * directly without needing to call smp_send_stop - * because we have a unique architecture where - * one thread can disable one or more other threads. - */ - thread_disable_others(); - - /* - * Call the hardware-specific machine power off function. - */ - if (mach_power_off) { - mach_power_off(); - } - - printk(KERN_EMERG "System Halted, OK to turn off power\n"); - local_irq_disable(); - for (;;) { - thread_suspend(); - } -} - -/* - * address_is_valid() - * check if an address is valid -- (for read access) - */ -static bool address_is_valid(const void *address) -{ - int addr = (int)address; - unsigned long socm, eocm, sdram, edram; - - if (addr & 3) - return false; - - processor_ocm(&socm, &eocm); - processor_dram(&sdram, &edram); - if (addr >= socm && addr < eocm) - return true; - - if (addr >= sdram && addr < edram) - return true; - - return false; -} - -/* - * vma_path_name_is_valid() - * check if path_name of a vma is a valid string - */ -static bool vma_path_name_is_valid(const char *str) -{ -#define MAX_NAME_LEN 256 - int i = 0; - if (!address_is_valid(str)) - return false; - - for (; i < MAX_NAME_LEN; i++, str++) { - if (*str == '\0') - return true; - } - - return false; -} - -/* - * show_vmas() - * show vma info of a process - */ -void show_vmas(struct task_struct *task) -{ -#ifdef CONFIG_DEBUG_VERBOSE -#define UBICOM32_MAX_VMA_COUNT 1024 - - struct vm_area_struct *vma; - struct file *file; - char *name = ""; - int flags, loop = 0; - - printk(KERN_NOTICE "Start of vma list\n"); - - if (!address_is_valid(task) || !address_is_valid(task->mm)) - goto error; - - vma = task->mm->mmap; - while (vma) { - if (!address_is_valid(vma)) - goto error; - - flags = vma->vm_flags; - file = vma->vm_file; - - if (file) { - /* seems better to use dentry op here, but sanity check is easier this way */ - if (!address_is_valid(file) || !address_is_valid(file->f_path.dentry) || !vma_path_name_is_valid(file->f_path.dentry->d_name.name)) - goto error; - - name = (char *)file->f_path.dentry->d_name.name; - } - - /* Similar to /proc/pid/maps format */ - printk(KERN_NOTICE "%08lx-%08lx %c%c%c%c %08lx %s\n", - vma->vm_start, - vma->vm_end, - flags & VM_READ ? 'r' : '-', - flags & VM_WRITE ? 'w' : '-', - flags & VM_EXEC ? 'x' : '-', - flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', - vma->vm_pgoff << PAGE_SHIFT, - name); - - vma = vma->vm_next; - - if (loop++ > UBICOM32_MAX_VMA_COUNT) - goto error; - } - - printk(KERN_NOTICE "End of vma list\n"); - return; - -error: - printk(KERN_NOTICE "\nCorrupted vma list, abort!\n"); -#endif -} - -/* - * show_regs() - * Print out all of the registers. - */ -void show_regs(struct pt_regs *regs) -{ - unsigned int i; - unsigned int en, lo, hi; - - printk(KERN_NOTICE "regs: %p, tid: %d\n", - (void *)regs, - thread_get_self()); - - printk(KERN_NOTICE "pc: %08x, previous_pc: %08x\n\n", - (unsigned int)regs->pc, - (unsigned int)regs->previous_pc); - - printk(KERN_NOTICE "Data registers\n"); - for (i = 0; i < 16; i++) { - printk("D%02d: %08x, ", i, (unsigned int)regs->dn[i]); - if ((i % 4) == 3) { - printk("\n"); - } - } - printk("\n"); - - printk(KERN_NOTICE "Address registers\n"); - for (i = 0; i < 8; i++) { - printk("A%02d: %08x, ", i, (unsigned int)regs->an[i]); - if ((i % 4) == 3) { - printk("\n"); - } - } - printk("\n"); - - printk(KERN_NOTICE "acc0: %08x-%08x, acc1: %08x-%08x\n", - (unsigned int)regs->acc0[1], - (unsigned int)regs->acc0[0], - (unsigned int)regs->acc1[1], - (unsigned int)regs->acc1[0]); - - printk(KERN_NOTICE "mac_rc16: %08x, source3: %08x\n", - (unsigned int)regs->mac_rc16, - (unsigned int)regs->source3); - - printk(KERN_NOTICE "inst_cnt: %08x, csr: %08x\n", - (unsigned int)regs->inst_cnt, - (unsigned int)regs->csr); - - printk(KERN_NOTICE "int_mask0: %08x, int_mask1: %08x\n", - (unsigned int)regs->int_mask0, - (unsigned int)regs->int_mask1); - - /* - * Dump range registers - */ - DUMP_RANGE_REGISTER("I", "0"); - DUMP_RANGE_REGISTER("I", "1"); - DUMP_RANGE_REGISTER("I", "2"); - DUMP_RANGE_REGISTER("I", "3"); - DUMP_RANGE_REGISTER("D", "0"); - DUMP_RANGE_REGISTER("D", "1"); - DUMP_RANGE_REGISTER("D", "2"); - DUMP_RANGE_REGISTER("D", "3"); - DUMP_RANGE_REGISTER("D", "4"); - - printk(KERN_NOTICE "frame_type: %d, nesting_level: %d, thread_type %d\n\n", - (int)regs->frame_type, - (int)regs->nesting_level, - (int)regs->thread_type); -} - -/* - * kernel_thread_helper() - * On execution d0 will be 0, d1 will be the argument to be passed to the - * kernel function. d2 contains the kernel function that needs to get - * called. d3 will contain address to do_exit which need to get moved - * into a5. On return from fork the child thread d0 will be 0. We call - * this dummy function which in turn loads the argument - */ -asmlinkage void kernel_thread_helper(void); - -/* - * kernel_thread() - * Create a kernel thread - */ -int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - - regs.dn[1] = (unsigned long)arg; - regs.dn[2] = (unsigned long)fn; - regs.dn[3] = (unsigned long)do_exit; - regs.an[5] = (unsigned long)kernel_thread_helper; - regs.pc = (unsigned long)kernel_thread_helper; - regs.nesting_level = 0; - regs.thread_type = KERNEL_THREAD; - - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, - 0, ®s, 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - -/* - * flush_thread() - * XXX todo - */ -void flush_thread(void) -{ - /* XXX todo */ -} - -/* - * sys_fork() - * Not implemented on no-mmu. - */ -asmlinkage int sys_fork(struct pt_regs *regs) -{ - /* fork almost works, enough to trick you into looking elsewhere :-( */ - return -EINVAL; -} - -/* - * sys_vfork() - * By the time we get here, the non-volatile registers have also been saved - * on the stack. We do some ugly pointer stuff here.. (see also copy_thread - * which does context copy). - */ -asmlinkage int sys_vfork(struct pt_regs *regs) -{ - unsigned long old_sp = regs->an[7]; - unsigned long old_a5 = regs->an[5]; - unsigned long old_return_address; - long do_fork_return; - - /* - * Read the old retrun address from the stack. - */ - if (copy_from_user(&old_return_address, - (void *)old_sp, sizeof(unsigned long))) { - force_sig(SIGSEGV, current); - return 0; - } - - /* - * Pop the vfork call frame by setting a5 and pc to the old_return - * address and incrementing the stack pointer by 4. - */ - regs->an[5] = old_return_address; - regs->pc = old_return_address; - regs->an[7] += 4; - - do_fork_return = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, - regs->an[7], regs, 0, NULL, NULL); - - /* - * Now we have to test if the return code is an error. If it is an error - * then restore the frame and we will execute error processing in user - * space. Other wise the child and the parent will return to the correct - * places. - */ - if ((unsigned long)(do_fork_return) >= (unsigned long)(-125)) { - /* - * Error case. We need to restore the frame. - */ - regs->an[5] = old_a5; - regs->pc = old_a5; - regs->an[7] = old_sp; - } - - return do_fork_return; -} - -/* - * sys_clone() - * creates a child thread. - */ -asmlinkage int sys_clone(unsigned long clone_flags, - unsigned long newsp, - struct pt_regs *regs) -{ - if (!newsp) - newsp = regs->an[7]; - return do_fork(clone_flags, newsp, regs, 0, - NULL, NULL); -} - -/* - * copy_thread() - * low level thread copy, only used by do_fork in kernel/fork.c - */ -int copy_thread(unsigned long clone_flags, - unsigned long usp, unsigned long topstk, - struct task_struct *p, struct pt_regs *regs) - -{ - struct pt_regs *childregs; - - childregs = (struct pt_regs *) - (task_stack_page(p) + THREAD_SIZE - 8) - 1; - - *childregs = *regs; - - /* - * Set return value for child to be 0. - */ - childregs->dn[0] = 0; - - if (usp) - childregs->an[7] = usp; - else - childregs->an[7] = (unsigned long)task_stack_page(p) + - THREAD_SIZE - 8; - - /* - * Set up the switch_to frame to return to "ret_from_fork" - */ - p->thread.a5 = (unsigned long)ret_from_fork; - p->thread.sp = (unsigned long)childregs; - - return 0; -} - -/* - * sys_execve() - * executes a new program. - */ -asmlinkage int sys_execve(char *name, char **argv, - char **envp, struct pt_regs *regs) -{ - int error; - char *filename; - - lock_kernel(); - filename = getname(name); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename, argv, envp, regs); - putname(filename); - asm (" .global sys_execve_complete\n" - " sys_execve_complete:"); -out: - unlock_kernel(); - return error; -} - -/* - * Return saved PC of a blocked thread. - */ -unsigned long thread_saved_pc(struct task_struct *tsk) -{ - return tsk->thread.a5; -} - - -unsigned long get_wchan(struct task_struct *p) -{ - unsigned long pc; - - /* - * If we don't have a process, or it is not the current - * one or not RUNNING, it makes no sense to ask for a - * wchan. - */ - if (!p || p == current || p->state == TASK_RUNNING) - return 0; - - /* - * TODO: If the process is in the middle of schedule, we - * are supposed to do something different but for now we - * will return the same thing in both situations. - */ - pc = thread_saved_pc(p); - if (in_sched_functions(pc)) - return pc; - return pc; -} - - -/* - * Infrequently used interface to dump task registers to core files. - */ -int dump_task_regs(struct task_struct *task, elf_gregset_t *elfregs) -{ - struct pt_regs *regs = task_pt_regs(task); - *(struct pt_regs *)elfregs = *regs; - - return 1; -} - -/* - * __switch_to is the function that implements the contex save and - * switch within the kernel. Since this is a function call very few - * registers have to be saved to pull this off. d0 holds prev and we - * want to preserve it. prev_switch is a pointer to task->thread - * structure. This is where we will save the register state. next_switch - * is pointer to the next task's thread structure that holds the - * registers. - */ -asmlinkage void *__switch_to(struct task_struct *prev, - struct thread_struct *prev_switch, - struct thread_struct *next_switch) - __attribute__((naked)); |