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205 lines
5.1 KiB
205 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sh/kernel/process.c |
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* |
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* This file handles the architecture-dependent parts of process handling.. |
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* |
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* Copyright (C) 1995 Linus Torvalds |
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* |
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* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
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* Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC |
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* Copyright (C) 2002 - 2008 Paul Mundt |
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*/ |
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#include <linux/module.h> |
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#include <linux/mm.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/slab.h> |
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#include <linux/elfcore.h> |
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#include <linux/fs.h> |
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#include <linux/ftrace.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/prefetch.h> |
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#include <linux/stackprotector.h> |
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#include <linux/uaccess.h> |
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#include <asm/mmu_context.h> |
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#include <asm/fpu.h> |
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#include <asm/syscalls.h> |
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#include <asm/switch_to.h> |
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void show_regs(struct pt_regs * regs) |
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{ |
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pr_info("\n"); |
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show_regs_print_info(KERN_DEFAULT); |
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pr_info("PC is at %pS\n", (void *)instruction_pointer(regs)); |
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pr_info("PR is at %pS\n", (void *)regs->pr); |
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pr_info("PC : %08lx SP : %08lx SR : %08lx ", regs->pc, |
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regs->regs[15], regs->sr); |
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#ifdef CONFIG_MMU |
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pr_cont("TEA : %08x\n", __raw_readl(MMU_TEA)); |
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#else |
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pr_cont("\n"); |
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#endif |
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pr_info("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", |
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regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3]); |
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pr_info("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", |
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regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]); |
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pr_info("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", |
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regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11]); |
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pr_info("R12 : %08lx R13 : %08lx R14 : %08lx\n", |
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regs->regs[12], regs->regs[13], regs->regs[14]); |
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pr_info("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", |
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regs->mach, regs->macl, regs->gbr, regs->pr); |
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show_trace(NULL, (unsigned long *)regs->regs[15], regs, KERN_DEFAULT); |
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show_code(regs); |
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} |
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void start_thread(struct pt_regs *regs, unsigned long new_pc, |
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unsigned long new_sp) |
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{ |
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regs->pr = 0; |
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regs->sr = SR_FD; |
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regs->pc = new_pc; |
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regs->regs[15] = new_sp; |
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free_thread_xstate(current); |
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} |
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EXPORT_SYMBOL(start_thread); |
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void flush_thread(void) |
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{ |
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struct task_struct *tsk = current; |
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flush_ptrace_hw_breakpoint(tsk); |
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#if defined(CONFIG_SH_FPU) |
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/* Forget lazy FPU state */ |
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clear_fpu(tsk, task_pt_regs(tsk)); |
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clear_used_math(); |
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#endif |
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} |
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void release_thread(struct task_struct *dead_task) |
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{ |
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/* do nothing */ |
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} |
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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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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 thread_info *ti = task_thread_info(p); |
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struct pt_regs *childregs; |
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#if defined(CONFIG_SH_DSP) |
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struct task_struct *tsk = current; |
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if (is_dsp_enabled(tsk)) { |
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/* We can use the __save_dsp or just copy the struct: |
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* __save_dsp(p); |
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* p->thread.dsp_status.status |= SR_DSP |
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*/ |
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p->thread.dsp_status = tsk->thread.dsp_status; |
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} |
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#endif |
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memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); |
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childregs = task_pt_regs(p); |
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p->thread.sp = (unsigned long) childregs; |
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if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
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memset(childregs, 0, sizeof(struct pt_regs)); |
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p->thread.pc = (unsigned long) ret_from_kernel_thread; |
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childregs->regs[4] = arg; |
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childregs->regs[5] = usp; |
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childregs->sr = SR_MD; |
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#if defined(CONFIG_SH_FPU) |
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childregs->sr |= SR_FD; |
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#endif |
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ti->addr_limit = KERNEL_DS; |
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ti->status &= ~TS_USEDFPU; |
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p->thread.fpu_counter = 0; |
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return 0; |
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} |
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*childregs = *current_pt_regs(); |
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if (usp) |
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childregs->regs[15] = usp; |
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ti->addr_limit = USER_DS; |
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if (clone_flags & CLONE_SETTLS) |
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childregs->gbr = tls; |
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childregs->regs[0] = 0; /* Set return value for child */ |
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p->thread.pc = (unsigned long) ret_from_fork; |
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return 0; |
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} |
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/* |
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* switch_to(x,y) should switch tasks from x to y. |
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* |
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*/ |
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__notrace_funcgraph struct task_struct * |
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__switch_to(struct task_struct *prev, struct task_struct *next) |
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{ |
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struct thread_struct *next_t = &next->thread; |
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#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) |
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__stack_chk_guard = next->stack_canary; |
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#endif |
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unlazy_fpu(prev, task_pt_regs(prev)); |
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/* we're going to use this soon, after a few expensive things */ |
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if (next->thread.fpu_counter > 5) |
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prefetch(next_t->xstate); |
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#ifdef CONFIG_MMU |
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/* |
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* Restore the kernel mode register |
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* k7 (r7_bank1) |
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*/ |
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asm volatile("ldc %0, r7_bank" |
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: /* no output */ |
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: "r" (task_thread_info(next))); |
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#endif |
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/* |
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* If the task has used fpu the last 5 timeslices, just do a full |
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* restore of the math state immediately to avoid the trap; the |
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* chances of needing FPU soon are obviously high now |
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*/ |
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if (next->thread.fpu_counter > 5) |
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__fpu_state_restore(); |
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return prev; |
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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 pc; |
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if (!p || p == current || task_is_running(p)) |
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return 0; |
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/* |
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* The same comment as on the Alpha applies here, too ... |
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*/ |
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pc = thread_saved_pc(p); |
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#ifdef CONFIG_FRAME_POINTER |
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if (in_sched_functions(pc)) { |
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unsigned long schedule_frame = (unsigned long)p->thread.sp; |
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return ((unsigned long *)schedule_frame)[21]; |
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} |
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#endif |
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return pc; |
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}
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