Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 394 insertions, 0 deletions

diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
new file mode 100644
index 000000000..33b0215a4
--- /dev/null
+++ b/arch/sparc/kernel/process_32.c
@@ -0,0 +1,394 @@
+// SPDX-License-Identifier: GPL-2.0
+/*  linux/arch/sparc/kernel/process.c
+ *
+ *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
+ *  Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+#include <linux/elfcore.h>
+#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/stddef.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/smp.h>
+#include <linux/reboot.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/cpu.h>
+
+#include <asm/auxio.h>
+#include <asm/oplib.h>
+#include <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/delay.h>
+#include <asm/processor.h>
+#include <asm/psr.h>
+#include <asm/elf.h>
+#include <asm/prom.h>
+#include <asm/unistd.h>
+#include <asm/setup.h>
+
+#include "kernel.h"
+
+/* 
+ * Power management idle function 
+ * Set in pm platform drivers (apc.c and pmc.c)
+ */
+void (*sparc_idle)(void);
+
+/* 
+ * Power-off handler instantiation for pm.h compliance
+ * This is done via auxio, but could be used as a fallback
+ * handler when auxio is not present-- unused for now...
+ */
+void (*pm_power_off)(void) = machine_power_off;
+EXPORT_SYMBOL(pm_power_off);
+
+/*
+ * sysctl - toggle power-off restriction for serial console 
+ * systems in machine_power_off()
+ */
+int scons_pwroff = 1;
+
+extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
+
+struct task_struct *last_task_used_math = NULL;
+struct thread_info *current_set[NR_CPUS];
+
+/* Idle loop support. */
+void arch_cpu_idle(void)
+{
+	if (sparc_idle)
+		(*sparc_idle)();
+	raw_local_irq_enable();
+}
+
+/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
+void machine_halt(void)
+{
+	local_irq_enable();
+	mdelay(8);
+	local_irq_disable();
+	prom_halt();
+	panic("Halt failed!");
+}
+
+void machine_restart(char * cmd)
+{
+	char *p;
+	
+	local_irq_enable();
+	mdelay(8);
+	local_irq_disable();
+
+	p = strchr (reboot_command, '\n');
+	if (p) *p = 0;
+	if (cmd)
+		prom_reboot(cmd);
+	if (*reboot_command)
+		prom_reboot(reboot_command);
+	prom_feval ("reset");
+	panic("Reboot failed!");
+}
+
+void machine_power_off(void)
+{
+	if (auxio_power_register &&
+	    (!of_node_is_type(of_console_device, "serial") || scons_pwroff)) {
+		u8 power_register = sbus_readb(auxio_power_register);
+		power_register |= AUXIO_POWER_OFF;
+		sbus_writeb(power_register, auxio_power_register);
+	}
+
+	machine_halt();
+}
+
+void show_regs(struct pt_regs *r)
+{
+	struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
+
+	show_regs_print_info(KERN_DEFAULT);
+
+        printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx    %s\n",
+	       r->psr, r->pc, r->npc, r->y, print_tainted());
+	printk("PC: <%pS>\n", (void *) r->pc);
+	printk("%%G: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
+	       r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
+	       r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
+	printk("%%O: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
+	       r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
+	       r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
+	printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
+
+	printk("%%L: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
+	       rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
+	       rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
+	printk("%%I: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
+	       rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
+	       rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
+}
+
+/*
+ * The show_stack() is external API which we do not use ourselves.
+ * The oops is printed in die_if_kernel.
+ */
+void show_stack(struct task_struct *tsk, unsigned long *_ksp, const char *loglvl)
+{
+	unsigned long pc, fp;
+	unsigned long task_base;
+	struct reg_window32 *rw;
+	int count = 0;
+
+	if (!tsk)
+		tsk = current;
+
+	if (tsk == current && !_ksp)
+		__asm__ __volatile__("mov	%%fp, %0" : "=r" (_ksp));
+
+	task_base = (unsigned long) task_stack_page(tsk);
+	fp = (unsigned long) _ksp;
+	do {
+		/* Bogus frame pointer? */
+		if (fp < (task_base + sizeof(struct thread_info)) ||
+		    fp >= (task_base + (PAGE_SIZE << 1)))
+			break;
+		rw = (struct reg_window32 *) fp;
+		pc = rw->ins[7];
+		printk("%s[%08lx : ", loglvl, pc);
+		printk("%s%pS ] ", loglvl, (void *) pc);
+		fp = rw->ins[6];
+	} while (++count < 16);
+	printk("%s\n", loglvl);
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(struct task_struct *tsk)
+{
+#ifndef CONFIG_SMP
+	if (last_task_used_math == tsk) {
+#else
+	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
+#endif
+		/* Keep process from leaving FPU in a bogon state. */
+		put_psr(get_psr() | PSR_EF);
+		fpsave(&tsk->thread.float_regs[0], &tsk->thread.fsr,
+		       &tsk->thread.fpqueue[0], &tsk->thread.fpqdepth);
+#ifndef CONFIG_SMP
+		last_task_used_math = NULL;
+#else
+		clear_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU);
+#endif
+	}
+}
+
+void flush_thread(void)
+{
+	current_thread_info()->w_saved = 0;
+
+#ifndef CONFIG_SMP
+	if(last_task_used_math == current) {
+#else
+	if (test_thread_flag(TIF_USEDFPU)) {
+#endif
+		/* Clean the fpu. */
+		put_psr(get_psr() | PSR_EF);
+		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
+		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
+#ifndef CONFIG_SMP
+		last_task_used_math = NULL;
+#else
+		clear_thread_flag(TIF_USEDFPU);
+#endif
+	}
+}
+
+static inline struct sparc_stackf __user *
+clone_stackframe(struct sparc_stackf __user *dst,
+		 struct sparc_stackf __user *src)
+{
+	unsigned long size, fp;
+	struct sparc_stackf *tmp;
+	struct sparc_stackf __user *sp;
+
+	if (get_user(tmp, &src->fp))
+		return NULL;
+
+	fp = (unsigned long) tmp;
+	size = (fp - ((unsigned long) src));
+	fp = (unsigned long) dst;
+	sp = (struct sparc_stackf __user *)(fp - size); 
+
+	/* do_fork() grabs the parent semaphore, we must release it
+	 * temporarily so we can build the child clone stack frame
+	 * without deadlocking.
+	 */
+	if (__copy_user(sp, src, size))
+		sp = NULL;
+	else if (put_user(fp, &sp->fp))
+		sp = NULL;
+
+	return sp;
+}
+
+/* Copy a Sparc thread.  The fork() return value conventions
+ * under SunOS are nothing short of bletcherous:
+ * Parent -->  %o0 == childs  pid, %o1 == 0
+ * Child  -->  %o0 == parents pid, %o1 == 1
+ *
+ * NOTE: We have a separate fork kpsr/kwim because
+ *       the parent could change these values between
+ *       sys_fork invocation and when we reach here
+ *       if the parent should sleep while trying to
+ *       allocate the task_struct and kernel stack in
+ *       do_fork().
+ * XXX See comment above sys_vfork in sparc64. todo.
+ */
+extern void ret_from_fork(void);
+extern void ret_from_kernel_thread(void);
+
+int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+	unsigned long clone_flags = args->flags;
+	unsigned long sp = args->stack;
+	unsigned long tls = args->tls;
+	struct thread_info *ti = task_thread_info(p);
+	struct pt_regs *childregs, *regs = current_pt_regs();
+	char *new_stack;
+
+#ifndef CONFIG_SMP
+	if(last_task_used_math == current) {
+#else
+	if (test_thread_flag(TIF_USEDFPU)) {
+#endif
+		put_psr(get_psr() | PSR_EF);
+		fpsave(&p->thread.float_regs[0], &p->thread.fsr,
+		       &p->thread.fpqueue[0], &p->thread.fpqdepth);
+	}
+
+	/*
+	 *  p->thread_info         new_stack   childregs stack bottom
+	 *  !                      !           !             !
+	 *  V                      V (stk.fr.) V  (pt_regs)  V
+	 *  +----- - - - - - ------+===========+=============+
+	 */
+	new_stack = task_stack_page(p) + THREAD_SIZE;
+	new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
+	childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
+
+	/*
+	 * A new process must start with interrupts disabled, see schedule_tail()
+	 * and finish_task_switch(). (If we do not do it and if a timer interrupt
+	 * hits before we unlock and attempts to take the rq->lock, we deadlock.)
+	 *
+	 * Thus, kpsr |= PSR_PIL.
+	 */
+	ti->ksp = (unsigned long) new_stack;
+	p->thread.kregs = childregs;
+
+	if (unlikely(args->fn)) {
+		extern int nwindows;
+		unsigned long psr;
+		memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
+		ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
+		childregs->u_regs[UREG_G1] = (unsigned long) args->fn;
+		childregs->u_regs[UREG_G2] = (unsigned long) args->fn_arg;
+		psr = childregs->psr = get_psr();
+		ti->kpsr = psr | PSR_PIL;
+		ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
+		return 0;
+	}
+	memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
+	childregs->u_regs[UREG_FP] = sp;
+	ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
+	ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
+	ti->kwim = current->thread.fork_kwim;
+
+	if (sp != regs->u_regs[UREG_FP]) {
+		struct sparc_stackf __user *childstack;
+		struct sparc_stackf __user *parentstack;
+
+		/*
+		 * This is a clone() call with supplied user stack.
+		 * Set some valid stack frames to give to the child.
+		 */
+		childstack = (struct sparc_stackf __user *)
+			(sp & ~0xfUL);
+		parentstack = (struct sparc_stackf __user *)
+			regs->u_regs[UREG_FP];
+
+#if 0
+		printk("clone: parent stack:\n");
+		show_stackframe(parentstack);
+#endif
+
+		childstack = clone_stackframe(childstack, parentstack);
+		if (!childstack)
+			return -EFAULT;
+
+#if 0
+		printk("clone: child stack:\n");
+		show_stackframe(childstack);
+#endif
+
+		childregs->u_regs[UREG_FP] = (unsigned long)childstack;
+	}
+
+#ifdef CONFIG_SMP
+	/* FPU must be disabled on SMP. */
+	childregs->psr &= ~PSR_EF;
+	clear_tsk_thread_flag(p, TIF_USEDFPU);
+#endif
+
+	/* Set the return value for the child. */
+	childregs->u_regs[UREG_I0] = current->pid;
+	childregs->u_regs[UREG_I1] = 1;
+
+	/* Set the return value for the parent. */
+	regs->u_regs[UREG_I1] = 0;
+
+	if (clone_flags & CLONE_SETTLS)
+		childregs->u_regs[UREG_G7] = tls;
+
+	return 0;
+}
+
+unsigned long __get_wchan(struct task_struct *task)
+{
+	unsigned long pc, fp, bias = 0;
+	unsigned long task_base = (unsigned long) task;
+        unsigned long ret = 0;
+	struct reg_window32 *rw;
+	int count = 0;
+
+	fp = task_thread_info(task)->ksp + bias;
+	do {
+		/* Bogus frame pointer? */
+		if (fp < (task_base + sizeof(struct thread_info)) ||
+		    fp >= (task_base + (2 * PAGE_SIZE)))
+			break;
+		rw = (struct reg_window32 *) fp;
+		pc = rw->ins[7];
+		if (!in_sched_functions(pc)) {
+			ret = pc;
+			goto out;
+		}
+		fp = rw->ins[6] + bias;
+	} while (++count < 16);
+
+out:
+	return ret;
+}
+