444 lines
10 KiB
C
444 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/kernel/process.c
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*
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* Copyright (C) 1996-2000 Russell King - Converted to ARM.
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* Original Copyright (C) 1995 Linus Torvalds
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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/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/user.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/elfcore.h>
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#include <linux/pm.h>
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#include <linux/tick.h>
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#include <linux/utsname.h>
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#include <linux/uaccess.h>
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#include <linux/random.h>
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#include <linux/hw_breakpoint.h>
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#include <linux/leds.h>
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#include <asm/processor.h>
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#include <asm/thread_notify.h>
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#include <asm/stacktrace.h>
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#include <asm/system_misc.h>
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#include <asm/mach/time.h>
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#include <asm/tls.h>
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#include <asm/vdso.h>
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#include "signal.h"
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#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)
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DEFINE_PER_CPU(struct task_struct *, __entry_task);
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#endif
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#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
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#include <linux/stackprotector.h>
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unsigned long __stack_chk_guard __read_mostly;
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EXPORT_SYMBOL(__stack_chk_guard);
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#endif
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#ifndef CONFIG_CURRENT_POINTER_IN_TPIDRURO
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asmlinkage struct task_struct *__current;
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EXPORT_SYMBOL(__current);
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#endif
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static const char *processor_modes[] __maybe_unused = {
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"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
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"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
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"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "MON_32" , "ABT_32" ,
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"UK8_32" , "UK9_32" , "HYP_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
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};
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static const char *isa_modes[] __maybe_unused = {
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"ARM" , "Thumb" , "Jazelle", "ThumbEE"
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};
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/*
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* This is our default idle handler.
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*/
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void (*arm_pm_idle)(void);
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/*
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* Called from the core idle loop.
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*/
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void arch_cpu_idle(void)
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{
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if (arm_pm_idle)
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arm_pm_idle();
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else
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cpu_do_idle();
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}
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void arch_cpu_idle_prepare(void)
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{
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local_fiq_enable();
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}
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void arch_cpu_idle_enter(void)
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{
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ledtrig_cpu(CPU_LED_IDLE_START);
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#ifdef CONFIG_PL310_ERRATA_769419
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wmb();
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#endif
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}
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void arch_cpu_idle_exit(void)
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{
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ledtrig_cpu(CPU_LED_IDLE_END);
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}
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void __show_regs_alloc_free(struct pt_regs *regs)
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{
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int i;
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/* check for r0 - r12 only */
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for (i = 0; i < 13; i++) {
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pr_alert("Register r%d information:", i);
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mem_dump_obj((void *)regs->uregs[i]);
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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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unsigned long flags;
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char buf[64];
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#ifndef CONFIG_CPU_V7M
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unsigned int domain;
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#ifdef CONFIG_CPU_SW_DOMAIN_PAN
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/*
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* Get the domain register for the parent context. In user
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* mode, we don't save the DACR, so lets use what it should
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* be. For other modes, we place it after the pt_regs struct.
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*/
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if (user_mode(regs)) {
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domain = DACR_UACCESS_ENABLE;
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} else {
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domain = to_svc_pt_regs(regs)->dacr;
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}
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#else
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domain = get_domain();
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#endif
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#endif
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show_regs_print_info(KERN_DEFAULT);
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printk("PC is at %pS\n", (void *)instruction_pointer(regs));
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printk("LR is at %pS\n", (void *)regs->ARM_lr);
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printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n",
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regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr);
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printk("sp : %08lx ip : %08lx fp : %08lx\n",
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regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
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printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
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regs->ARM_r10, regs->ARM_r9,
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regs->ARM_r8);
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printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
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regs->ARM_r7, regs->ARM_r6,
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regs->ARM_r5, regs->ARM_r4);
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printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
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regs->ARM_r3, regs->ARM_r2,
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regs->ARM_r1, regs->ARM_r0);
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flags = regs->ARM_cpsr;
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buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
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buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
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buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
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buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
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buf[4] = '\0';
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#ifndef CONFIG_CPU_V7M
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{
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const char *segment;
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if ((domain & domain_mask(DOMAIN_USER)) ==
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domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
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segment = "none";
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else
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segment = "user";
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printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
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buf, interrupts_enabled(regs) ? "n" : "ff",
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fast_interrupts_enabled(regs) ? "n" : "ff",
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processor_modes[processor_mode(regs)],
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isa_modes[isa_mode(regs)], segment);
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}
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#else
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printk("xPSR: %08lx\n", regs->ARM_cpsr);
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#endif
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#ifdef CONFIG_CPU_CP15
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{
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unsigned int ctrl;
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buf[0] = '\0';
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#ifdef CONFIG_CPU_CP15_MMU
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{
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unsigned int transbase;
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asm("mrc p15, 0, %0, c2, c0\n\t"
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: "=r" (transbase));
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snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
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transbase, domain);
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}
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#endif
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asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
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printk("Control: %08x%s\n", ctrl, buf);
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}
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#endif
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}
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void show_regs(struct pt_regs * regs)
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{
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__show_regs(regs);
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dump_backtrace(regs, NULL, KERN_DEFAULT);
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}
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ATOMIC_NOTIFIER_HEAD(thread_notify_head);
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EXPORT_SYMBOL_GPL(thread_notify_head);
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/*
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* Free current thread data structures etc..
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*/
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void exit_thread(struct task_struct *tsk)
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{
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thread_notify(THREAD_NOTIFY_EXIT, task_thread_info(tsk));
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}
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void flush_thread(void)
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{
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struct thread_info *thread = current_thread_info();
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struct task_struct *tsk = current;
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flush_ptrace_hw_breakpoint(tsk);
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memset(thread->used_cp, 0, sizeof(thread->used_cp));
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memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
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memset(&thread->fpstate, 0, sizeof(union fp_state));
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flush_tls();
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thread_notify(THREAD_NOTIFY_FLUSH, thread);
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}
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asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
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int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
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{
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unsigned long clone_flags = args->flags;
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unsigned long stack_start = args->stack;
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unsigned long tls = args->tls;
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struct thread_info *thread = task_thread_info(p);
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struct pt_regs *childregs = task_pt_regs(p);
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memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
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#ifdef CONFIG_CPU_USE_DOMAINS
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/*
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* Copy the initial value of the domain access control register
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* from the current thread: thread->addr_limit will have been
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* copied from the current thread via setup_thread_stack() in
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* kernel/fork.c
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*/
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thread->cpu_domain = get_domain();
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#endif
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if (likely(!args->fn)) {
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*childregs = *current_pt_regs();
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childregs->ARM_r0 = 0;
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if (stack_start)
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childregs->ARM_sp = stack_start;
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} else {
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memset(childregs, 0, sizeof(struct pt_regs));
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thread->cpu_context.r4 = (unsigned long)args->fn_arg;
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thread->cpu_context.r5 = (unsigned long)args->fn;
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childregs->ARM_cpsr = SVC_MODE;
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}
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thread->cpu_context.pc = (unsigned long)ret_from_fork;
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thread->cpu_context.sp = (unsigned long)childregs;
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clear_ptrace_hw_breakpoint(p);
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if (clone_flags & CLONE_SETTLS)
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thread->tp_value[0] = tls;
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thread->tp_value[1] = get_tpuser();
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thread_notify(THREAD_NOTIFY_COPY, thread);
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return 0;
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}
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unsigned long __get_wchan(struct task_struct *p)
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{
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struct stackframe frame;
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unsigned long stack_page;
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int count = 0;
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frame.fp = thread_saved_fp(p);
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frame.sp = thread_saved_sp(p);
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frame.lr = 0; /* recovered from the stack */
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frame.pc = thread_saved_pc(p);
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stack_page = (unsigned long)task_stack_page(p);
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do {
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if (frame.sp < stack_page ||
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frame.sp >= stack_page + THREAD_SIZE ||
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unwind_frame(&frame) < 0)
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return 0;
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if (!in_sched_functions(frame.pc))
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return frame.pc;
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} while (count ++ < 16);
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return 0;
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}
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#ifdef CONFIG_MMU
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#ifdef CONFIG_KUSER_HELPERS
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/*
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* The vectors page is always readable from user space for the
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* atomic helpers. Insert it into the gate_vma so that it is visible
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* through ptrace and /proc/<pid>/mem.
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*/
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static struct vm_area_struct gate_vma;
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static int __init gate_vma_init(void)
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{
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vma_init(&gate_vma, NULL);
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gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
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gate_vma.vm_start = 0xffff0000;
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gate_vma.vm_end = 0xffff0000 + PAGE_SIZE;
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vm_flags_init(&gate_vma, VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYEXEC);
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return 0;
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}
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arch_initcall(gate_vma_init);
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struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
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{
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return &gate_vma;
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}
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int in_gate_area(struct mm_struct *mm, unsigned long addr)
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{
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return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
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}
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int in_gate_area_no_mm(unsigned long addr)
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{
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return in_gate_area(NULL, addr);
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}
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#define is_gate_vma(vma) ((vma) == &gate_vma)
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#else
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#define is_gate_vma(vma) 0
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#endif
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const char *arch_vma_name(struct vm_area_struct *vma)
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{
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return is_gate_vma(vma) ? "[vectors]" : NULL;
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}
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/* If possible, provide a placement hint at a random offset from the
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* stack for the sigpage and vdso pages.
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*/
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static unsigned long sigpage_addr(const struct mm_struct *mm,
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unsigned int npages)
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{
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unsigned long offset;
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unsigned long first;
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unsigned long last;
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unsigned long addr;
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unsigned int slots;
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first = PAGE_ALIGN(mm->start_stack);
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last = TASK_SIZE - (npages << PAGE_SHIFT);
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/* No room after stack? */
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if (first > last)
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return 0;
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/* Just enough room? */
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||
|
|
if (first == last)
|
||
|
|
return first;
|
||
|
|
|
||
|
|
slots = ((last - first) >> PAGE_SHIFT) + 1;
|
||
|
|
|
||
|
|
offset = get_random_u32_below(slots);
|
||
|
|
|
||
|
|
addr = first + (offset << PAGE_SHIFT);
|
||
|
|
|
||
|
|
return addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct page *signal_page;
|
||
|
|
extern struct page *get_signal_page(void);
|
||
|
|
|
||
|
|
static int sigpage_mremap(const struct vm_special_mapping *sm,
|
||
|
|
struct vm_area_struct *new_vma)
|
||
|
|
{
|
||
|
|
current->mm->context.sigpage = new_vma->vm_start;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct vm_special_mapping sigpage_mapping = {
|
||
|
|
.name = "[sigpage]",
|
||
|
|
.pages = &signal_page,
|
||
|
|
.mremap = sigpage_mremap,
|
||
|
|
};
|
||
|
|
|
||
|
|
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
|
||
|
|
{
|
||
|
|
struct mm_struct *mm = current->mm;
|
||
|
|
struct vm_area_struct *vma;
|
||
|
|
unsigned long npages;
|
||
|
|
unsigned long addr;
|
||
|
|
unsigned long hint;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
if (!signal_page)
|
||
|
|
signal_page = get_signal_page();
|
||
|
|
if (!signal_page)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
npages = 1; /* for sigpage */
|
||
|
|
npages += vdso_total_pages;
|
||
|
|
|
||
|
|
if (mmap_write_lock_killable(mm))
|
||
|
|
return -EINTR;
|
||
|
|
hint = sigpage_addr(mm, npages);
|
||
|
|
addr = get_unmapped_area(NULL, hint, npages << PAGE_SHIFT, 0, 0);
|
||
|
|
if (IS_ERR_VALUE(addr)) {
|
||
|
|
ret = addr;
|
||
|
|
goto up_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
vma = _install_special_mapping(mm, addr, PAGE_SIZE,
|
||
|
|
VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
|
||
|
|
&sigpage_mapping);
|
||
|
|
|
||
|
|
if (IS_ERR(vma)) {
|
||
|
|
ret = PTR_ERR(vma);
|
||
|
|
goto up_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
mm->context.sigpage = addr;
|
||
|
|
|
||
|
|
/* Unlike the sigpage, failure to install the vdso is unlikely
|
||
|
|
* to be fatal to the process, so no error check needed
|
||
|
|
* here.
|
||
|
|
*/
|
||
|
|
arm_install_vdso(mm, addr + PAGE_SIZE);
|
||
|
|
|
||
|
|
up_fail:
|
||
|
|
mmap_write_unlock(mm);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
#endif
|