Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 267 insertions, 0 deletions

diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
new file mode 100644
index 000000000..4e77a0673
--- /dev/null
+++ b/arch/m68k/kernel/process.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/arch/m68k/kernel/process.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ *
+ *  68060 fixes by Jesper Skov
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/reboot.h>
+#include <linux/init_task.h>
+#include <linux/mqueue.h>
+#include <linux/rcupdate.h>
+
+#include <linux/uaccess.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+
+
+asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
+
+void arch_cpu_idle(void)
+{
+#if defined(MACH_ATARI_ONLY)
+	/* block out HSYNC on the atari (falcon) */
+	__asm__("stop #0x2200" : : : "cc");
+#else
+	__asm__("stop #0x2000" : : : "cc");
+#endif
+}
+
+void machine_restart(char * __unused)
+{
+	if (mach_reset)
+		mach_reset();
+	for (;;);
+}
+
+void machine_halt(void)
+{
+	if (mach_halt)
+		mach_halt();
+	for (;;);
+}
+
+void machine_power_off(void)
+{
+	if (mach_power_off)
+		mach_power_off();
+	for (;;);
+}
+
+void (*pm_power_off)(void) = machine_power_off;
+EXPORT_SYMBOL(pm_power_off);
+
+void show_regs(struct pt_regs * regs)
+{
+	pr_info("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
+		regs->format, regs->vector, regs->pc, regs->sr,
+		print_tainted());
+	pr_info("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
+		regs->orig_d0, regs->d0, regs->a2, regs->a1);
+	pr_info("A0: %08lx  D5: %08lx  D4: %08lx\n", regs->a0, regs->d5,
+		regs->d4);
+	pr_info("D3: %08lx  D2: %08lx  D1: %08lx\n", regs->d3, regs->d2,
+		regs->d1);
+	if (!(regs->sr & PS_S))
+		pr_info("USP: %08lx\n", rdusp());
+}
+
+void flush_thread(void)
+{
+	current->thread.fs = __USER_DS;
+#ifdef CONFIG_FPU
+	if (!FPU_IS_EMU) {
+		unsigned long zero = 0;
+		asm volatile("frestore %0": :"m" (zero));
+	}
+#endif
+}
+
+/*
+ * Why not generic sys_clone, you ask?  m68k passes all arguments on stack.
+ * And we need all registers saved, which means a bunch of stuff pushed
+ * on top of pt_regs, which means that sys_clone() arguments would be
+ * buried.  We could, of course, copy them, but it's too costly for no
+ * good reason - generic clone() would have to copy them *again* for
+ * do_fork() anyway.  So in this case it's actually better to pass pt_regs *
+ * and extract arguments for do_fork() from there.  Eventually we might
+ * go for calling do_fork() directly from the wrapper, but only after we
+ * are finished with do_fork() prototype conversion.
+ */
+asmlinkage int m68k_clone(struct pt_regs *regs)
+{
+	/* regs will be equal to current_pt_regs() */
+	return do_fork(regs->d1, regs->d2, 0,
+		       (int __user *)regs->d3, (int __user *)regs->d4);
+}
+
+int copy_thread(unsigned long clone_flags, unsigned long usp,
+		 unsigned long arg, struct task_struct *p)
+{
+	struct fork_frame {
+		struct switch_stack sw;
+		struct pt_regs regs;
+	} *frame;
+
+	frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
+
+	p->thread.ksp = (unsigned long)frame;
+	p->thread.esp0 = (unsigned long)&frame->regs;
+
+	/*
+	 * Must save the current SFC/DFC value, NOT the value when
+	 * the parent was last descheduled - RGH  10-08-96
+	 */
+	p->thread.fs = get_fs().seg;
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		/* kernel thread */
+		memset(frame, 0, sizeof(struct fork_frame));
+		frame->regs.sr = PS_S;
+		frame->sw.a3 = usp; /* function */
+		frame->sw.d7 = arg;
+		frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
+		p->thread.usp = 0;
+		return 0;
+	}
+	memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
+		sizeof(struct fork_frame));
+	frame->regs.d0 = 0;
+	frame->sw.retpc = (unsigned long)ret_from_fork;
+	p->thread.usp = usp ?: rdusp();
+
+	if (clone_flags & CLONE_SETTLS)
+		task_thread_info(p)->tp_value = frame->regs.d5;
+
+#ifdef CONFIG_FPU
+	if (!FPU_IS_EMU) {
+		/* Copy the current fpu state */
+		asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
+
+		if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
+			if (CPU_IS_COLDFIRE) {
+				asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
+					      "fmovel %/fpiar,%1\n\t"
+					      "fmovel %/fpcr,%2\n\t"
+					      "fmovel %/fpsr,%3"
+					      :
+					      : "m" (p->thread.fp[0]),
+						"m" (p->thread.fpcntl[0]),
+						"m" (p->thread.fpcntl[1]),
+						"m" (p->thread.fpcntl[2])
+					      : "memory");
+			} else {
+				asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
+					      "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
+					      :
+					      : "m" (p->thread.fp[0]),
+						"m" (p->thread.fpcntl[0])
+					      : "memory");
+			}
+		}
+
+		/* Restore the state in case the fpu was busy */
+		asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
+	}
+#endif /* CONFIG_FPU */
+
+	return 0;
+}
+
+/* Fill in the fpu structure for a core dump.  */
+int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
+{
+	if (FPU_IS_EMU) {
+		int i;
+
+		memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
+		memcpy(fpu->fpregs, current->thread.fp, 96);
+		/* Convert internal fpu reg representation
+		 * into long double format
+		 */
+		for (i = 0; i < 24; i += 3)
+			fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
+			                 ((fpu->fpregs[i] & 0x0000ffff) << 16);
+		return 1;
+	}
+
+	if (IS_ENABLED(CONFIG_FPU)) {
+		char fpustate[216];
+
+		/* First dump the fpu context to avoid protocol violation.  */
+		asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
+		if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
+			return 0;
+
+		if (CPU_IS_COLDFIRE) {
+			asm volatile ("fmovel %/fpiar,%0\n\t"
+				      "fmovel %/fpcr,%1\n\t"
+				      "fmovel %/fpsr,%2\n\t"
+				      "fmovemd %/fp0-%/fp7,%3"
+				      :
+				      : "m" (fpu->fpcntl[0]),
+					"m" (fpu->fpcntl[1]),
+					"m" (fpu->fpcntl[2]),
+					"m" (fpu->fpregs[0])
+				      : "memory");
+		} else {
+			asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
+				      :
+				      : "m" (fpu->fpcntl[0])
+				      : "memory");
+			asm volatile ("fmovemx %/fp0-%/fp7,%0"
+				      :
+				      : "m" (fpu->fpregs[0])
+				      : "memory");
+		}
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL(dump_fpu);
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long fp, pc;
+	unsigned long stack_page;
+	int count = 0;
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	stack_page = (unsigned long)task_stack_page(p);
+	fp = ((struct switch_stack *)p->thread.ksp)->a6;
+	do {
+		if (fp < stack_page+sizeof(struct thread_info) ||
+		    fp >= 8184+stack_page)
+			return 0;
+		pc = ((unsigned long *)fp)[1];
+		if (!in_sched_functions(pc))
+			return pc;
+		fp = *(unsigned long *) fp;
+	} while (count++ < 16);
+	return 0;
+}