8d3e09b433
Pull regset conversion fix from Al Viro: "Fix a regression from an unnoticed bisect hazard in the regset series. A bunch of old (aout, originally) primitives used by coredumps became dead code after fdpic conversion to regsets. Removal of that dead code had been the first commit in the followups to regset series; unfortunately, it happened to hide the bisect hazard on sh (extern for fpregs_get() had not been updated in the main series when it should have been; followup simply made fpregs_get() static). And without that followup commit this bisect hazard became breakage in the mainline" Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: kill unused dump_fpu() instances
271 lines
6.9 KiB
C
271 lines
6.9 KiB
C
/*
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* Architecture-dependent parts of process handling.
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*
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* Copyright (C) 2013 Altera Corporation
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* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2009 Wind River Systems Inc
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* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
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* Copyright (C) 2004 Microtronix Datacom Ltd
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/export.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/mm_types.h>
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#include <linux/tick.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/traps.h>
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#include <asm/cpuinfo.h>
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asmlinkage void ret_from_fork(void);
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asmlinkage void ret_from_kernel_thread(void);
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void (*pm_power_off)(void) = NULL;
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EXPORT_SYMBOL(pm_power_off);
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void arch_cpu_idle(void)
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{
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local_irq_enable();
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}
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/*
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* The development boards have no way to pull a board reset. Just jump to the
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* cpu reset address and let the boot loader or the code in head.S take care of
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* resetting peripherals.
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*/
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void machine_restart(char *__unused)
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{
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pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);
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local_irq_disable();
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__asm__ __volatile__ (
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"jmp %0\n\t"
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:
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: "r" (cpuinfo.reset_addr)
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: "r4");
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}
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void machine_halt(void)
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{
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pr_notice("Machine halt...\n");
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local_irq_disable();
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for (;;)
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;
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}
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/*
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* There is no way to power off the development boards. So just spin for now. If
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* we ever have a way of resetting a board using a GPIO we should add that here.
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*/
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void machine_power_off(void)
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{
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pr_notice("Machine power off...\n");
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local_irq_disable();
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for (;;)
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;
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}
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void show_regs(struct pt_regs *regs)
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{
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pr_notice("\n");
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show_regs_print_info(KERN_DEFAULT);
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pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",
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regs->r1, regs->r2, regs->r3, regs->r4);
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pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",
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regs->r5, regs->r6, regs->r7, regs->r8);
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pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",
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regs->r9, regs->r10, regs->r11, regs->r12);
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pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",
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regs->r13, regs->r14, regs->r15);
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pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n",
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regs->ra, regs->fp, regs->sp, regs->gp);
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pr_notice("ea: %08lx estatus: %08lx\n",
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regs->ea, regs->estatus);
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}
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void flush_thread(void)
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{
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}
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int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg,
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struct task_struct *p, unsigned long tls)
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{
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struct pt_regs *childregs = task_pt_regs(p);
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struct pt_regs *regs;
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struct switch_stack *stack;
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struct switch_stack *childstack =
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((struct switch_stack *)childregs) - 1;
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if (unlikely(p->flags & PF_KTHREAD)) {
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memset(childstack, 0,
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sizeof(struct switch_stack) + sizeof(struct pt_regs));
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childstack->r16 = usp; /* fn */
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childstack->r17 = arg;
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childstack->ra = (unsigned long) ret_from_kernel_thread;
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childregs->estatus = STATUS_PIE;
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childregs->sp = (unsigned long) childstack;
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p->thread.ksp = (unsigned long) childstack;
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p->thread.kregs = childregs;
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return 0;
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}
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regs = current_pt_regs();
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*childregs = *regs;
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childregs->r2 = 0; /* Set the return value for the child. */
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childregs->r7 = 0;
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stack = ((struct switch_stack *) regs) - 1;
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*childstack = *stack;
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childstack->ra = (unsigned long)ret_from_fork;
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p->thread.kregs = childregs;
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p->thread.ksp = (unsigned long) childstack;
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if (usp)
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childregs->sp = usp;
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/* Initialize tls register. */
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if (clone_flags & CLONE_SETTLS)
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childstack->r23 = tls;
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return 0;
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}
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/*
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* Generic dumping code. Used for panic and debug.
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*/
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void dump(struct pt_regs *fp)
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{
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unsigned long *sp;
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unsigned char *tp;
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int i;
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pr_emerg("\nCURRENT PROCESS:\n\n");
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pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid);
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if (current->mm) {
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pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
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(int) current->mm->start_code,
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(int) current->mm->end_code,
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(int) current->mm->start_data,
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(int) current->mm->end_data,
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(int) current->mm->end_data,
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(int) current->mm->brk);
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pr_emerg("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
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(int) current->mm->start_stack,
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(int)(((unsigned long) current) + THREAD_SIZE));
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}
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pr_emerg("PC: %08lx\n", fp->ea);
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pr_emerg("SR: %08lx SP: %08lx\n",
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(long) fp->estatus, (long) fp);
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pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n",
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fp->r1, fp->r2, fp->r3);
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pr_emerg("r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
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fp->r4, fp->r5, fp->r6, fp->r7);
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pr_emerg("r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
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fp->r8, fp->r9, fp->r10, fp->r11);
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pr_emerg("r12: %08lx r13: %08lx r14: %08lx r15: %08lx\n",
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fp->r12, fp->r13, fp->r14, fp->r15);
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pr_emerg("or2: %08lx ra: %08lx fp: %08lx sp: %08lx\n",
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fp->orig_r2, fp->ra, fp->fp, fp->sp);
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pr_emerg("\nUSP: %08x TRAPFRAME: %08x\n",
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(unsigned int) fp->sp, (unsigned int) fp);
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pr_emerg("\nCODE:");
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tp = ((unsigned char *) fp->ea) - 0x20;
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for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
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if ((i % 0x10) == 0)
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pr_emerg("\n%08x: ", (int) (tp + i));
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pr_emerg("%08x ", (int) *sp++);
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}
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pr_emerg("\n");
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pr_emerg("\nKERNEL STACK:");
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tp = ((unsigned char *) fp) - 0x40;
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for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
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if ((i % 0x10) == 0)
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pr_emerg("\n%08x: ", (int) (tp + i));
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pr_emerg("%08x ", (int) *sp++);
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}
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pr_emerg("\n");
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pr_emerg("\n");
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pr_emerg("\nUSER STACK:");
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tp = (unsigned char *) (fp->sp - 0x10);
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for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
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if ((i % 0x10) == 0)
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pr_emerg("\n%08x: ", (int) (tp + i));
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pr_emerg("%08x ", (int) *sp++);
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}
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pr_emerg("\n\n");
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}
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long fp, pc;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_page = (unsigned long)p;
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fp = ((struct switch_stack *)p->thread.ksp)->fp; /* ;dgt2 */
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do {
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if (fp < stack_page+sizeof(struct task_struct) ||
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fp >= 8184+stack_page) /* ;dgt2;tmp */
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return 0;
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pc = ((unsigned long *)fp)[1];
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if (!in_sched_functions(pc))
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return pc;
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fp = *(unsigned long *) fp;
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} while (count++ < 16); /* ;dgt2;tmp */
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return 0;
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}
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/*
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* Do necessary setup to start up a newly executed thread.
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* Will startup in user mode (status_extension = 0).
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*/
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void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
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{
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memset((void *) regs, 0, sizeof(struct pt_regs));
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regs->estatus = ESTATUS_EPIE | ESTATUS_EU;
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regs->ea = pc;
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regs->sp = sp;
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}
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asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp,
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int __user *parent_tidptr, int __user *child_tidptr,
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unsigned long tls)
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{
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struct kernel_clone_args args = {
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.flags = (lower_32_bits(clone_flags) & ~CSIGNAL),
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.pidfd = parent_tidptr,
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.child_tid = child_tidptr,
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.parent_tid = parent_tidptr,
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.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL),
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.stack = newsp,
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.tls = tls,
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};
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return _do_fork(&args);
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}
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