summaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/process.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kernel/process.c')
-rw-r--r--arch/arm64/kernel/process.c388
1 files changed, 388 insertions, 0 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
new file mode 100644
index 000000000..c6b1f3b96
--- /dev/null
+++ b/arch/arm64/kernel/process.c
@@ -0,0 +1,388 @@
+/*
+ * Based on arch/arm/kernel/process.c
+ *
+ * Original Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 1996-2000 Russell King - Converted to ARM.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+
+#include <linux/compat.h>
+#include <linux/efi.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/user.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/elfcore.h>
+#include <linux/pm.h>
+#include <linux/tick.h>
+#include <linux/utsname.h>
+#include <linux/uaccess.h>
+#include <linux/random.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/personality.h>
+#include <linux/notifier.h>
+
+#include <asm/compat.h>
+#include <asm/cacheflush.h>
+#include <asm/fpsimd.h>
+#include <asm/mmu_context.h>
+#include <asm/processor.h>
+#include <asm/stacktrace.h>
+
+#ifdef CONFIG_CC_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+void soft_restart(unsigned long addr)
+{
+ setup_mm_for_reboot();
+ cpu_soft_restart(virt_to_phys(cpu_reset), addr);
+ /* Should never get here */
+ BUG();
+}
+
+/*
+ * Function pointers to optional machine specific functions
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL_GPL(pm_power_off);
+
+void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
+
+/*
+ * This is our default idle handler.
+ */
+void arch_cpu_idle(void)
+{
+ /*
+ * This should do all the clock switching and wait for interrupt
+ * tricks
+ */
+ cpu_do_idle();
+ local_irq_enable();
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void arch_cpu_idle_dead(void)
+{
+ cpu_die();
+}
+#endif
+
+/*
+ * Called by kexec, immediately prior to machine_kexec().
+ *
+ * This must completely disable all secondary CPUs; simply causing those CPUs
+ * to execute e.g. a RAM-based pin loop is not sufficient. This allows the
+ * kexec'd kernel to use any and all RAM as it sees fit, without having to
+ * avoid any code or data used by any SW CPU pin loop. The CPU hotplug
+ * functionality embodied in disable_nonboot_cpus() to achieve this.
+ */
+void machine_shutdown(void)
+{
+ disable_nonboot_cpus();
+}
+
+/*
+ * Halting simply requires that the secondary CPUs stop performing any
+ * activity (executing tasks, handling interrupts). smp_send_stop()
+ * achieves this.
+ */
+void machine_halt(void)
+{
+ local_irq_disable();
+ smp_send_stop();
+ while (1);
+}
+
+/*
+ * Power-off simply requires that the secondary CPUs stop performing any
+ * activity (executing tasks, handling interrupts). smp_send_stop()
+ * achieves this. When the system power is turned off, it will take all CPUs
+ * with it.
+ */
+void machine_power_off(void)
+{
+ local_irq_disable();
+ smp_send_stop();
+ if (pm_power_off)
+ pm_power_off();
+}
+
+/*
+ * Restart requires that the secondary CPUs stop performing any activity
+ * while the primary CPU resets the system. Systems with a single CPU can
+ * use soft_restart() as their machine descriptor's .restart hook, since that
+ * will cause the only available CPU to reset. Systems with multiple CPUs must
+ * provide a HW restart implementation, to ensure that all CPUs reset at once.
+ * This is required so that any code running after reset on the primary CPU
+ * doesn't have to co-ordinate with other CPUs to ensure they aren't still
+ * executing pre-reset code, and using RAM that the primary CPU's code wishes
+ * to use. Implementing such co-ordination would be essentially impossible.
+ */
+void machine_restart(char *cmd)
+{
+ /* Disable interrupts first */
+ local_irq_disable();
+ smp_send_stop();
+
+ /*
+ * UpdateCapsule() depends on the system being reset via
+ * ResetSystem().
+ */
+ if (efi_enabled(EFI_RUNTIME_SERVICES))
+ efi_reboot(reboot_mode, NULL);
+
+ /* Now call the architecture specific reboot code. */
+ if (arm_pm_restart)
+ arm_pm_restart(reboot_mode, cmd);
+ else
+ do_kernel_restart(cmd);
+
+ /*
+ * Whoops - the architecture was unable to reboot.
+ */
+ printk("Reboot failed -- System halted\n");
+ while (1);
+}
+
+void __show_regs(struct pt_regs *regs)
+{
+ int i, top_reg;
+ u64 lr, sp;
+
+ if (compat_user_mode(regs)) {
+ lr = regs->compat_lr;
+ sp = regs->compat_sp;
+ top_reg = 12;
+ } else {
+ lr = regs->regs[30];
+ sp = regs->sp;
+ top_reg = 29;
+ }
+
+ show_regs_print_info(KERN_DEFAULT);
+ print_symbol("PC is at %s\n", instruction_pointer(regs));
+ print_symbol("LR is at %s\n", lr);
+ printk("pc : [<%016llx>] lr : [<%016llx>] pstate: %08llx\n",
+ regs->pc, lr, regs->pstate);
+ printk("sp : %016llx\n", sp);
+ for (i = top_reg; i >= 0; i--) {
+ printk("x%-2d: %016llx ", i, regs->regs[i]);
+ if (i % 2 == 0)
+ printk("\n");
+ }
+ printk("\n");
+}
+
+void show_regs(struct pt_regs * regs)
+{
+ printk("\n");
+ __show_regs(regs);
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+}
+
+static void tls_thread_flush(void)
+{
+ asm ("msr tpidr_el0, xzr");
+
+ if (is_compat_task()) {
+ current->thread.tp_value = 0;
+
+ /*
+ * We need to ensure ordering between the shadow state and the
+ * hardware state, so that we don't corrupt the hardware state
+ * with a stale shadow state during context switch.
+ */
+ barrier();
+ asm ("msr tpidrro_el0, xzr");
+ }
+}
+
+void flush_thread(void)
+{
+ fpsimd_flush_thread();
+ tls_thread_flush();
+ flush_ptrace_hw_breakpoint(current);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+ fpsimd_preserve_current_state();
+ *dst = *src;
+ return 0;
+}
+
+asmlinkage void ret_from_fork(void) asm("ret_from_fork");
+
+int copy_thread(unsigned long clone_flags, unsigned long stack_start,
+ unsigned long stk_sz, struct task_struct *p)
+{
+ struct pt_regs *childregs = task_pt_regs(p);
+ unsigned long tls = p->thread.tp_value;
+
+ memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
+
+ if (likely(!(p->flags & PF_KTHREAD))) {
+ *childregs = *current_pt_regs();
+ childregs->regs[0] = 0;
+ if (is_compat_thread(task_thread_info(p))) {
+ if (stack_start)
+ childregs->compat_sp = stack_start;
+ } else {
+ /*
+ * Read the current TLS pointer from tpidr_el0 as it may be
+ * out-of-sync with the saved value.
+ */
+ asm("mrs %0, tpidr_el0" : "=r" (tls));
+ if (stack_start) {
+ /* 16-byte aligned stack mandatory on AArch64 */
+ if (stack_start & 15)
+ return -EINVAL;
+ childregs->sp = stack_start;
+ }
+ }
+ /*
+ * If a TLS pointer was passed to clone (4th argument), use it
+ * for the new thread.
+ */
+ if (clone_flags & CLONE_SETTLS)
+ tls = childregs->regs[3];
+ } else {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->pstate = PSR_MODE_EL1h;
+ p->thread.cpu_context.x19 = stack_start;
+ p->thread.cpu_context.x20 = stk_sz;
+ }
+ p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+ p->thread.cpu_context.sp = (unsigned long)childregs;
+ p->thread.tp_value = tls;
+
+ ptrace_hw_copy_thread(p);
+
+ return 0;
+}
+
+static void tls_thread_switch(struct task_struct *next)
+{
+ unsigned long tpidr, tpidrro;
+
+ if (!is_compat_task()) {
+ asm("mrs %0, tpidr_el0" : "=r" (tpidr));
+ current->thread.tp_value = tpidr;
+ }
+
+ if (is_compat_thread(task_thread_info(next))) {
+ tpidr = 0;
+ tpidrro = next->thread.tp_value;
+ } else {
+ tpidr = next->thread.tp_value;
+ tpidrro = 0;
+ }
+
+ asm(
+ " msr tpidr_el0, %0\n"
+ " msr tpidrro_el0, %1"
+ : : "r" (tpidr), "r" (tpidrro));
+}
+
+/*
+ * Thread switching.
+ */
+struct task_struct *__switch_to(struct task_struct *prev,
+ struct task_struct *next)
+{
+ struct task_struct *last;
+
+ fpsimd_thread_switch(next);
+ tls_thread_switch(next);
+ hw_breakpoint_thread_switch(next);
+ contextidr_thread_switch(next);
+
+ /*
+ * Complete any pending TLB or cache maintenance on this CPU in case
+ * the thread migrates to a different CPU.
+ */
+ dsb(ish);
+
+ /* the actual thread switch */
+ last = cpu_switch_to(prev, next);
+
+ return last;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+ struct stackframe frame;
+ unsigned long stack_page;
+ int count = 0;
+ if (!p || p == current || p->state == TASK_RUNNING)
+ return 0;
+
+ frame.fp = thread_saved_fp(p);
+ frame.sp = thread_saved_sp(p);
+ frame.pc = thread_saved_pc(p);
+ stack_page = (unsigned long)task_stack_page(p);
+ do {
+ if (frame.sp < stack_page ||
+ frame.sp >= stack_page + THREAD_SIZE ||
+ unwind_frame(&frame))
+ return 0;
+ if (!in_sched_functions(frame.pc))
+ return frame.pc;
+ } while (count ++ < 16);
+ return 0;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+ if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+ sp -= get_random_int() & ~PAGE_MASK;
+ return sp & ~0xf;
+}
+
+static unsigned long randomize_base(unsigned long base)
+{
+ unsigned long range_end = base + (STACK_RND_MASK << PAGE_SHIFT) + 1;
+ return randomize_range(base, range_end, 0) ? : base;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+ return randomize_base(mm->brk);
+}