arch/sh/kernel/process_32.c

Source file repositories/reference/linux-study-clean/arch/sh/kernel/process_32.c

File Facts

System
Linux kernel
Corpus path
arch/sh/kernel/process_32.c
Extension
.c
Size
5085 bytes
Lines
198
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/kernel/process.c
 *
 * This file handles the architecture-dependent parts of process handling..
 *
 *  Copyright (C) 1995  Linus Torvalds
 *
 *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 *		     Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
 *		     Copyright (C) 2002 - 2008  Paul Mundt
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/slab.h>
#include <linux/elfcore.h>
#include <linux/fs.h>
#include <linux/ftrace.h>
#include <linux/hw_breakpoint.h>
#include <linux/prefetch.h>
#include <linux/stackprotector.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/fpu.h>
#include <asm/syscalls.h>
#include <asm/switch_to.h>

void show_regs(struct pt_regs * regs)
{
	pr_info("\n");
	show_regs_print_info(KERN_DEFAULT);

	pr_info("PC is at %pS\n", (void *)instruction_pointer(regs));
	pr_info("PR is at %pS\n", (void *)regs->pr);

	pr_info("PC  : %08lx SP  : %08lx SR  : %08lx ", regs->pc,
		regs->regs[15], regs->sr);
#ifdef CONFIG_MMU
	pr_cont("TEA : %08x\n", __raw_readl(MMU_TEA));
#else
	pr_cont("\n");
#endif

	pr_info("R0  : %08lx R1  : %08lx R2  : %08lx R3  : %08lx\n",
		regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3]);
	pr_info("R4  : %08lx R5  : %08lx R6  : %08lx R7  : %08lx\n",
		regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
	pr_info("R8  : %08lx R9  : %08lx R10 : %08lx R11 : %08lx\n",
		regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11]);
	pr_info("R12 : %08lx R13 : %08lx R14 : %08lx\n",
		regs->regs[12], regs->regs[13], regs->regs[14]);
	pr_info("MACH: %08lx MACL: %08lx GBR : %08lx PR  : %08lx\n",
		regs->mach, regs->macl, regs->gbr, regs->pr);

	show_trace(NULL, (unsigned long *)regs->regs[15], regs, KERN_DEFAULT);
	show_code(regs);
}

void start_thread(struct pt_regs *regs, unsigned long new_pc,
		  unsigned long new_sp)
{
	regs->pr = 0;
	regs->sr = SR_FD;
	regs->pc = new_pc;
	regs->regs[15] = new_sp;

	free_thread_xstate(current);
}
EXPORT_SYMBOL(start_thread);

void flush_thread(void)
{
	struct task_struct *tsk = current;

	flush_ptrace_hw_breakpoint(tsk);

#if defined(CONFIG_SH_FPU)
	/* Forget lazy FPU state */
	clear_fpu(tsk, task_pt_regs(tsk));
	clear_used_math();
#endif
}

asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

Annotation

Implementation Notes