cregit-Linux how code gets into the kernel

Release 4.7 arch/cris/arch-v10/kernel/process.c

 *  linux/arch/cris/kernel/process.c
 *  Copyright (C) 1995  Linus Torvalds
 *  Copyright (C) 2000-2002  Axis Communications AB
 *  Authors:   Bjorn Wesen (
 *             Mikael Starvik (
 * This file handles the architecture-dependent parts of process handling..

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <arch/svinto.h>
#include <linux/init.h>
#include <arch/system.h>
#include <linux/ptrace.h>

void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */

 * We use this if we don't have any better
 * idle routine..

void default_idle(void) { #ifdef CONFIG_ETRAX_GPIO etrax_gpio_wake_up_check(); #endif local_irq_enable(); }


mikael starvikmikael starvik1583.33%150.00%
thomas gleixnerthomas gleixner316.67%150.00%

/* if the watchdog is enabled, we can simply disable interrupts and go * into an eternal loop, and the watchdog will reset the CPU after 0.1s * if on the other hand the watchdog wasn't enabled, we just enable it and wait */
void hard_reset_now (void) { /* * Don't declare this variable elsewhere. We don't want any other * code to know about it than the watchdog handler in entry.S and * this code, implementing hard reset through the watchdog. */ #if defined(CONFIG_ETRAX_WATCHDOG) extern int cause_of_death; #endif printk("*** HARD RESET ***\n"); local_irq_disable(); #if defined(CONFIG_ETRAX_WATCHDOG) cause_of_death = 0xbedead; #else /* Since we dont plan to keep on resetting the watchdog, the key can be arbitrary hence three */ *R_WATCHDOG = IO_FIELD(R_WATCHDOG, key, 3) | IO_STATE(R_WATCHDOG, enable, start); #endif while(1) /* waiting for RETRIBUTION! */ ; }


mikael starvikmikael starvik6998.57%150.00%
simon arlottsimon arlott11.43%150.00%

/* * Return saved PC of a blocked thread. */
unsigned long thread_saved_pc(struct task_struct *t) { return task_pt_regs(t)->irp; }


mikael starvikmikael starvik1894.74%150.00%
al viroal viro15.26%150.00%

/* setup the child's kernel stack with a pt_regs and switch_stack on it. * it will be un-nested during _resume and _ret_from_sys_call when the * new thread is scheduled. * * also setup the thread switching structure which is used to keep * thread-specific data during _resumes. * */ asmlinkage void ret_from_fork(void); asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, struct task_struct *p) { struct pt_regs *childregs = task_pt_regs(p); struct switch_stack *swstack = ((struct switch_stack *)childregs) - 1; /* put the pt_regs structure at the end of the new kernel stack page and fix it up * remember that the task_struct doubles as the kernel stack for the task */ if (unlikely(p->flags & PF_KTHREAD)) { memset(swstack, 0, sizeof(struct switch_stack) + sizeof(struct pt_regs)); swstack->r1 = usp; swstack->r2 = arg; childregs->dccr = 1 << I_DCCR_BITNR; swstack->return_ip = (unsigned long) ret_from_kernel_thread; p->thread.ksp = (unsigned long) swstack; p->thread.usp = 0; return 0; } *childregs = *current_pt_regs(); /* struct copy of pt_regs */ childregs->r10 = 0; /* child returns 0 after a fork/clone */ /* put the switch stack right below the pt_regs */ swstack->r9 = 0; /* parameter to ret_from_sys_call, 0 == dont restart the syscall */ /* we want to return into ret_from_sys_call after the _resume */ swstack->return_ip = (unsigned long) ret_from_fork; /* Will call ret_from_sys_call */ /* fix the user-mode stackpointer */ p->thread.usp = usp ?: rdusp(); /* and the kernel-mode one */ p->thread.ksp = (unsigned long) swstack; #ifdef DEBUG printk("copy_thread: new regs at 0x%p, as shown below:\n", childregs); show_registers(childregs); #endif return 0; }


mikael starvikmikael starvik11553.49%250.00%
al viroal viro10046.51%250.00%

unsigned long get_wchan(struct task_struct *p) { #if 0 /* YURGH. TODO. */ unsigned long ebp, esp, eip; unsigned long stack_page; int count = 0; if (!p || p == current || p->state == TASK_RUNNING) return 0; stack_page = (unsigned long)p; esp = p->thread.esp; if (!stack_page || esp < stack_page || esp > 8188+stack_page) return 0; /* include/asm-i386/system.h:switch_to() pushes ebp last. */ ebp = *(unsigned long *) esp; do { if (ebp < stack_page || ebp > 8184+stack_page) return 0; eip = *(unsigned long *) (ebp+4); if (!in_sched_functions(eip)) return eip; ebp = *(unsigned long *) ebp; } while (count++ < 16); #endif return 0; }


mikael starvikmikael starvik23100.00%2100.00%

#undef last_sched #undef first_sched
void show_regs(struct pt_regs * regs) { unsigned long usp = rdusp(); show_regs_print_info(KERN_DEFAULT); printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n", regs->irp, regs->srp, regs->dccr, usp, regs->mof ); printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", regs->r0, regs->r1, regs->r2, regs->r3); printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", regs->r4, regs->r5, regs->r6, regs->r7); printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", regs->r8, regs->r9, regs->r10, regs->r11); printk("r12: %08lx r13: %08lx oR10: %08lx\n", regs->r12, regs->r13, regs->orig_r10); }


andrew mortonandrew morton12096.00%150.00%
tejun heotejun heo54.00%150.00%

Overall Contributors

mikael starvikmikael starvik27952.54%214.29%
andrew mortonandrew morton12323.16%214.29%
al viroal viro11020.72%321.43%
tejun heotejun heo81.51%214.29%
jesper nilssonjesper nilsson40.75%214.29%
thomas gleixnerthomas gleixner30.56%17.14%
david howellsdavid howells30.56%17.14%
simon arlottsimon arlott10.19%17.14%
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