Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 396 insertions, 0 deletions

diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
new file mode 100644
index 000000000..bcdfc6168
--- /dev/null
+++ b/arch/sparc/kernel/traps_32.c
@@ -0,0 +1,396 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/sparc/kernel/traps.c
+ *
+ * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
+ */
+
+/*
+ * I hate traps on the sparc, grrr...
+ */
+
+#include <linux/sched/mm.h>
+#include <linux/sched/debug.h>
+#include <linux/mm_types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/smp.h>
+#include <linux/kdebug.h>
+#include <linux/export.h>
+
+#include <asm/delay.h>
+#include <asm/ptrace.h>
+#include <asm/oplib.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/unistd.h>
+#include <asm/traps.h>
+
+#include "entry.h"
+#include "kernel.h"
+
+/* #define TRAP_DEBUG */
+
+static void instruction_dump(unsigned long *pc)
+{
+	int i;
+	
+	if((((unsigned long) pc) & 3))
+                return;
+
+	for(i = -3; i < 6; i++)
+		printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
+	printk("\n");
+}
+
+#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
+#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
+
+void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
+{
+	static int die_counter;
+	int count = 0;
+
+	/* Amuse the user. */
+	printk(
+"              \\|/ ____ \\|/\n"
+"              \"@'/ ,. \\`@\"\n"
+"              /_| \\__/ |_\\\n"
+"                 \\__U_/\n");
+
+	printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
+	show_regs(regs);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+
+	__SAVE; __SAVE; __SAVE; __SAVE;
+	__SAVE; __SAVE; __SAVE; __SAVE;
+	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
+	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
+
+	{
+		struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
+
+		/* Stop the back trace when we hit userland or we
+		 * find some badly aligned kernel stack. Set an upper
+		 * bound in case our stack is trashed and we loop.
+		 */
+		while(rw					&&
+		      count++ < 30				&&
+                      (((unsigned long) rw) >= PAGE_OFFSET)	&&
+		      !(((unsigned long) rw) & 0x7)) {
+			printk("Caller[%08lx]: %pS\n", rw->ins[7],
+			       (void *) rw->ins[7]);
+			rw = (struct reg_window32 *)rw->ins[6];
+		}
+	}
+	printk("Instruction DUMP:");
+	instruction_dump ((unsigned long *) regs->pc);
+	if(regs->psr & PSR_PS)
+		do_exit(SIGKILL);
+	do_exit(SIGSEGV);
+}
+
+void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
+{
+	if(type < 0x80) {
+		/* Sun OS's puke from bad traps, Linux survives! */
+		printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
+		die_if_kernel("Whee... Hello Mr. Penguin", regs);
+	}	
+
+	if(regs->psr & PSR_PS)
+		die_if_kernel("Kernel bad trap", regs);
+
+	force_sig_fault(SIGILL, ILL_ILLTRP,
+			(void __user *)regs->pc, type - 0x80, current);
+}
+
+void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			    unsigned long psr)
+{
+	if(psr & PSR_PS)
+		die_if_kernel("Kernel illegal instruction", regs);
+#ifdef TRAP_DEBUG
+	printk("Ill instr. at pc=%08lx instruction is %08lx\n",
+	       regs->pc, *(unsigned long *)regs->pc);
+#endif
+
+	send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current);
+}
+
+void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			 unsigned long psr)
+{
+	if(psr & PSR_PS)
+		die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
+	send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current);
+}
+
+/* XXX User may want to be allowed to do this. XXX */
+
+void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			    unsigned long psr)
+{
+	if(regs->psr & PSR_PS) {
+		printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
+		       regs->u_regs[UREG_RETPC]);
+		die_if_kernel("BOGUS", regs);
+		/* die_if_kernel("Kernel MNA access", regs); */
+	}
+#if 0
+	show_regs (regs);
+	instruction_dump ((unsigned long *) regs->pc);
+	printk ("do_MNA!\n");
+#endif
+	send_sig_fault(SIGBUS, BUS_ADRALN,
+		       /* FIXME: Should dig out mna address */ (void *)0,
+		       0, current);
+}
+
+static unsigned long init_fsr = 0x0UL;
+static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
+                { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
+
+void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		 unsigned long psr)
+{
+	/* Sanity check... */
+	if(psr & PSR_PS)
+		die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
+
+	put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */
+	regs->psr |= PSR_EF;
+#ifndef CONFIG_SMP
+	if(last_task_used_math == current)
+		return;
+	if(last_task_used_math) {
+		/* Other processes fpu state, save away */
+		struct task_struct *fptask = last_task_used_math;
+		fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
+		       &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
+	}
+	last_task_used_math = current;
+	if(used_math()) {
+		fpload(&current->thread.float_regs[0], &current->thread.fsr);
+	} else {
+		/* Set initial sane state. */
+		fpload(&init_fregs[0], &init_fsr);
+		set_used_math();
+	}
+#else
+	if(!used_math()) {
+		fpload(&init_fregs[0], &init_fsr);
+		set_used_math();
+	} else {
+		fpload(&current->thread.float_regs[0], &current->thread.fsr);
+	}
+	set_thread_flag(TIF_USEDFPU);
+#endif
+}
+
+static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
+static unsigned long fake_fsr;
+static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
+static unsigned long fake_depth;
+
+void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		 unsigned long psr)
+{
+	static int calls;
+	unsigned long fsr;
+	int ret = 0;
+	int code;
+#ifndef CONFIG_SMP
+	struct task_struct *fpt = last_task_used_math;
+#else
+	struct task_struct *fpt = current;
+#endif
+	put_psr(get_psr() | PSR_EF);
+	/* If nobody owns the fpu right now, just clear the
+	 * error into our fake static buffer and hope it don't
+	 * happen again.  Thank you crashme...
+	 */
+#ifndef CONFIG_SMP
+	if(!fpt) {
+#else
+	if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
+#endif
+		fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
+		regs->psr &= ~PSR_EF;
+		return;
+	}
+	fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
+	       &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
+#ifdef DEBUG_FPU
+	printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
+#endif
+
+	switch ((fpt->thread.fsr & 0x1c000)) {
+	/* switch on the contents of the ftt [floating point trap type] field */
+#ifdef DEBUG_FPU
+	case (1 << 14):
+		printk("IEEE_754_exception\n");
+		break;
+#endif
+	case (2 << 14):  /* unfinished_FPop (underflow & co) */
+	case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */
+		ret = do_mathemu(regs, fpt);
+		break;
+#ifdef DEBUG_FPU
+	case (4 << 14):
+		printk("sequence_error (OS bug...)\n");
+		break;
+	case (5 << 14):
+		printk("hardware_error (uhoh!)\n");
+		break;
+	case (6 << 14):
+		printk("invalid_fp_register (user error)\n");
+		break;
+#endif /* DEBUG_FPU */
+	}
+	/* If we successfully emulated the FPop, we pretend the trap never happened :-> */
+	if (ret) {
+		fpload(&current->thread.float_regs[0], &current->thread.fsr);
+		return;
+	}
+	/* nope, better SIGFPE the offending process... */
+	       
+#ifdef CONFIG_SMP
+	clear_tsk_thread_flag(fpt, TIF_USEDFPU);
+#endif
+	if(psr & PSR_PS) {
+		/* The first fsr store/load we tried trapped,
+		 * the second one will not (we hope).
+		 */
+		printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
+		       regs->pc);
+		regs->pc = regs->npc;
+		regs->npc += 4;
+		calls++;
+		if(calls > 2)
+			die_if_kernel("Too many Penguin-FPU traps from kernel mode",
+				      regs);
+		return;
+	}
+
+	fsr = fpt->thread.fsr;
+	code = FPE_FLTUNK;
+	if ((fsr & 0x1c000) == (1 << 14)) {
+		if (fsr & 0x10)
+			code = FPE_FLTINV;
+		else if (fsr & 0x08)
+			code = FPE_FLTOVF;
+		else if (fsr & 0x04)
+			code = FPE_FLTUND;
+		else if (fsr & 0x02)
+			code = FPE_FLTDIV;
+		else if (fsr & 0x01)
+			code = FPE_FLTRES;
+	}
+	send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt);
+#ifndef CONFIG_SMP
+	last_task_used_math = NULL;
+#endif
+	regs->psr &= ~PSR_EF;
+	if(calls > 0)
+		calls=0;
+}
+
+void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			 unsigned long psr)
+{
+	if(psr & PSR_PS)
+		die_if_kernel("Penguin overflow trap from kernel mode", regs);
+	send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current);
+}
+
+void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		       unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+	printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
+	       pc, npc, psr);
+#endif
+	if(psr & PSR_PS)
+		panic("Tell me what a watchpoint trap is, and I'll then deal "
+		      "with such a beast...");
+}
+
+void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		       unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+	printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
+	       pc, npc, psr);
+#endif
+	force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc, 0, current);
+}
+
+void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			unsigned long psr)
+{
+	send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
+}
+
+void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			 unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+	printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
+	       pc, npc, psr);
+#endif
+	send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
+}
+
+void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		       unsigned long psr)
+{
+	send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current);
+}
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+void do_BUG(const char *file, int line)
+{
+        // bust_spinlocks(1);   XXX Not in our original BUG()
+        printk("kernel BUG at %s:%d!\n", file, line);
+}
+EXPORT_SYMBOL(do_BUG);
+#endif
+
+/* Since we have our mappings set up, on multiprocessors we can spin them
+ * up here so that timer interrupts work during initialization.
+ */
+
+void trap_init(void)
+{
+	extern void thread_info_offsets_are_bolixed_pete(void);
+
+	/* Force linker to barf if mismatched */
+	if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||
+	    TI_TASK        != offsetof(struct thread_info, task) ||
+	    TI_FLAGS       != offsetof(struct thread_info, flags) ||
+	    TI_CPU         != offsetof(struct thread_info, cpu) ||
+	    TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||
+	    TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||
+	    TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||
+	    TI_KSP         != offsetof(struct thread_info, ksp) ||
+	    TI_KPC         != offsetof(struct thread_info, kpc) ||
+	    TI_KPSR        != offsetof(struct thread_info, kpsr) ||
+	    TI_KWIM        != offsetof(struct thread_info, kwim) ||
+	    TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
+	    TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
+	    TI_W_SAVED     != offsetof(struct thread_info, w_saved))
+		thread_info_offsets_are_bolixed_pete();
+
+	/* Attach to the address space of init_task. */
+	mmgrab(&init_mm);
+	current->active_mm = &init_mm;
+
+	/* NOTE: Other cpus have this done as they are started
+	 *       up on SMP.
+	 */
+}