Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 231 insertions, 0 deletions

diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
new file mode 100644
index 000000000..27fddb56b
--- /dev/null
+++ b/arch/sh/kernel/process_32.c
@@ -0,0 +1,231 @@
+/*
+ * 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
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#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)
+{
+	printk("\n");
+	show_regs_print_info(KERN_DEFAULT);
+
+	printk("PC is at %pS\n", (void *)instruction_pointer(regs));
+	printk("PR is at %pS\n", (void *)regs->pr);
+
+	printk("PC  : %08lx SP  : %08lx SR  : %08lx ",
+	       regs->pc, regs->regs[15], regs->sr);
+#ifdef CONFIG_MMU
+	printk("TEA : %08x\n", __raw_readl(MMU_TEA));
+#else
+	printk("\n");
+#endif
+
+	printk("R0  : %08lx R1  : %08lx R2  : %08lx R3  : %08lx\n",
+	       regs->regs[0],regs->regs[1],
+	       regs->regs[2],regs->regs[3]);
+	printk("R4  : %08lx R5  : %08lx R6  : %08lx R7  : %08lx\n",
+	       regs->regs[4],regs->regs[5],
+	       regs->regs[6],regs->regs[7]);
+	printk("R8  : %08lx R9  : %08lx R10 : %08lx R11 : %08lx\n",
+	       regs->regs[8],regs->regs[9],
+	       regs->regs[10],regs->regs[11]);
+	printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
+	       regs->regs[12],regs->regs[13],
+	       regs->regs[14]);
+	printk("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);
+	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
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+	/* do nothing */
+}
+
+/* Fill in the fpu structure for a core dump.. */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
+{
+	int fpvalid = 0;
+
+#if defined(CONFIG_SH_FPU)
+	struct task_struct *tsk = current;
+
+	fpvalid = !!tsk_used_math(tsk);
+	if (fpvalid)
+		fpvalid = !fpregs_get(tsk, NULL, 0,
+				      sizeof(struct user_fpu_struct),
+				      fpu, NULL);
+#endif
+
+	return fpvalid;
+}
+EXPORT_SYMBOL(dump_fpu);
+
+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 thread_info *ti = task_thread_info(p);
+	struct pt_regs *childregs;
+
+#if defined(CONFIG_SH_DSP)
+	struct task_struct *tsk = current;
+
+	if (is_dsp_enabled(tsk)) {
+		/* We can use the __save_dsp or just copy the struct:
+		 * __save_dsp(p);
+		 * p->thread.dsp_status.status |= SR_DSP
+		 */
+		p->thread.dsp_status = tsk->thread.dsp_status;
+	}
+#endif
+
+	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
+
+	childregs = task_pt_regs(p);
+	p->thread.sp = (unsigned long) childregs;
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+		childregs->regs[4] = arg;
+		childregs->regs[5] = usp;
+		childregs->sr = SR_MD;
+#if defined(CONFIG_SH_FPU)
+		childregs->sr |= SR_FD;
+#endif
+		ti->addr_limit = KERNEL_DS;
+		ti->status &= ~TS_USEDFPU;
+		p->thread.fpu_counter = 0;
+		return 0;
+	}
+	*childregs = *current_pt_regs();
+
+	if (usp)
+		childregs->regs[15] = usp;
+	ti->addr_limit = USER_DS;
+
+	if (clone_flags & CLONE_SETTLS)
+		childregs->gbr = childregs->regs[0];
+
+	childregs->regs[0] = 0; /* Set return value for child */
+	p->thread.pc = (unsigned long) ret_from_fork;
+	return 0;
+}
+
+/*
+ *	switch_to(x,y) should switch tasks from x to y.
+ *
+ */
+__notrace_funcgraph struct task_struct *
+__switch_to(struct task_struct *prev, struct task_struct *next)
+{
+	struct thread_struct *next_t = &next->thread;
+
+#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
+	__stack_chk_guard = next->stack_canary;
+#endif
+
+	unlazy_fpu(prev, task_pt_regs(prev));
+
+	/* we're going to use this soon, after a few expensive things */
+	if (next->thread.fpu_counter > 5)
+		prefetch(next_t->xstate);
+
+#ifdef CONFIG_MMU
+	/*
+	 * Restore the kernel mode register
+	 *	k7 (r7_bank1)
+	 */
+	asm volatile("ldc	%0, r7_bank"
+		     : /* no output */
+		     : "r" (task_thread_info(next)));
+#endif
+
+	/*
+	 * If the task has used fpu the last 5 timeslices, just do a full
+	 * restore of the math state immediately to avoid the trap; the
+	 * chances of needing FPU soon are obviously high now
+	 */
+	if (next->thread.fpu_counter > 5)
+		__fpu_state_restore();
+
+	return prev;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long pc;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	/*
+	 * The same comment as on the Alpha applies here, too ...
+	 */
+	pc = thread_saved_pc(p);
+
+#ifdef CONFIG_FRAME_POINTER
+	if (in_sched_functions(pc)) {
+		unsigned long schedule_frame = (unsigned long)p->thread.sp;
+		return ((unsigned long *)schedule_frame)[21];
+	}
+#endif
+
+	return pc;
+}