1 files changed, 0 insertions, 421 deletions
diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c
deleted file mode 100644
index 83a7186198d7..000000000000
--- a/arch/tile/kernel/traps.c
+++ /dev/null
@@ -1,421 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   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, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <linux/kdebug.h>
-#include <linux/module.h>
-#include <linux/reboot.h>
-#include <linux/uaccess.h>
-#include <linux/ptrace.h>
-#include <linux/hardirq.h>
-#include <linux/nmi.h>
-#include <asm/stack.h>
-#include <asm/traps.h>
-#include <asm/setup.h>
-
-#include <arch/interrupts.h>
-#include <arch/spr_def.h>
-#include <arch/opcode.h>
-
-void __init trap_init(void)
-{
-	/* Nothing needed here since we link code at .intrpt */
-}
-
-int unaligned_fixup = 1;
-
-static int __init setup_unaligned_fixup(char *str)
-{
-	/*
-	 * Say "=-1" to completely disable it.  If you just do "=0", we
-	 * will still parse the instruction, then fire a SIGBUS with
-	 * the correct address from inside the single_step code.
-	 */
-	if (kstrtoint(str, 0, &unaligned_fixup) != 0)
-		return 0;
-
-	pr_info("Fixups for unaligned data accesses are %s\n",
-		unaligned_fixup >= 0 ?
-		(unaligned_fixup ? "enabled" : "disabled") :
-		"completely disabled");
-	return 1;
-}
-__setup("unaligned_fixup=", setup_unaligned_fixup);
-
-#if CHIP_HAS_TILE_DMA()
-
-static int dma_disabled;
-
-static int __init nodma(char *str)
-{
-	pr_info("User-space DMA is disabled\n");
-	dma_disabled = 1;
-	return 1;
-}
-__setup("nodma", nodma);
-
-/* How to decode SPR_GPV_REASON */
-#define IRET_ERROR (1U << 31)
-#define MT_ERROR   (1U << 30)
-#define MF_ERROR   (1U << 29)
-#define SPR_INDEX  ((1U << 15) - 1)
-#define SPR_MPL_SHIFT  9  /* starting bit position for MPL encoded in SPR */
-
-/*
- * See if this GPV is just to notify the kernel of SPR use and we can
- * retry the user instruction after adjusting some MPLs suitably.
- */
-static int retry_gpv(unsigned int gpv_reason)
-{
-	int mpl;
-
-	if (gpv_reason & IRET_ERROR)
-		return 0;
-
-	BUG_ON((gpv_reason & (MT_ERROR|MF_ERROR)) == 0);
-	mpl = (gpv_reason & SPR_INDEX) >> SPR_MPL_SHIFT;
-	if (mpl == INT_DMA_NOTIFY && !dma_disabled) {
-		/* User is turning on DMA. Allow it and retry. */
-		printk(KERN_DEBUG "Process %d/%s is now enabled for DMA\n",
-		       current->pid, current->comm);
-		BUG_ON(current->thread.tile_dma_state.enabled);
-		current->thread.tile_dma_state.enabled = 1;
-		grant_dma_mpls();
-		return 1;
-	}
-
-	return 0;
-}
-
-#endif /* CHIP_HAS_TILE_DMA() */
-
-extern tile_bundle_bits bpt_code;
-
-asm(".pushsection .rodata.bpt_code,\"a\";"
-    ".align 8;"
-    "bpt_code: bpt;"
-    ".size bpt_code,.-bpt_code;"
-    ".popsection");
-
-static int special_ill(tile_bundle_bits bundle, int *sigp, int *codep)
-{
-	int sig, code, maxcode;
-
-	if (bundle == bpt_code) {
-		*sigp = SIGTRAP;
-		*codep = TRAP_BRKPT;
-		return 1;
-	}
-
-	/* If it's a "raise" bundle, then "ill" must be in pipe X1. */
-#ifdef __tilegx__
-	if ((bundle & TILEGX_BUNDLE_MODE_MASK) != 0)
-		return 0;
-	if (get_Opcode_X1(bundle) != RRR_0_OPCODE_X1)
-		return 0;
-	if (get_RRROpcodeExtension_X1(bundle) != UNARY_RRR_0_OPCODE_X1)
-		return 0;
-	if (get_UnaryOpcodeExtension_X1(bundle) != ILL_UNARY_OPCODE_X1)
-		return 0;
-#else
-	if (bundle & TILEPRO_BUNDLE_Y_ENCODING_MASK)
-		return 0;
-	if (get_Opcode_X1(bundle) != SHUN_0_OPCODE_X1)
-		return 0;
-	if (get_UnShOpcodeExtension_X1(bundle) != UN_0_SHUN_0_OPCODE_X1)
-		return 0;
-	if (get_UnOpcodeExtension_X1(bundle) != ILL_UN_0_SHUN_0_OPCODE_X1)
-		return 0;
-#endif
-
-	/* Check that the magic distinguishers are set to mean "raise". */
-	if (get_Dest_X1(bundle) != 29 || get_SrcA_X1(bundle) != 37)
-		return 0;
-
-	/* There must be an "addli zero, zero, VAL" in X0. */
-	if (get_Opcode_X0(bundle) != ADDLI_OPCODE_X0)
-		return 0;
-	if (get_Dest_X0(bundle) != TREG_ZERO)
-		return 0;
-	if (get_SrcA_X0(bundle) != TREG_ZERO)
-		return 0;
-
-	/*
-	 * Validate the proposed signal number and si_code value.
-	 * Note that we embed these in the static instruction itself
-	 * so that we perturb the register state as little as possible
-	 * at the time of the actual fault; it's unlikely you'd ever
-	 * need to dynamically choose which kind of fault to raise
-	 * from user space.
-	 */
-	sig = get_Imm16_X0(bundle) & 0x3f;
-	switch (sig) {
-	case SIGILL:
-		maxcode = NSIGILL;
-		break;
-	case SIGFPE:
-		maxcode = NSIGFPE;
-		break;
-	case SIGSEGV:
-		maxcode = NSIGSEGV;
-		break;
-	case SIGBUS:
-		maxcode = NSIGBUS;
-		break;
-	case SIGTRAP:
-		maxcode = NSIGTRAP;
-		break;
-	default:
-		return 0;
-	}
-	code = (get_Imm16_X0(bundle) >> 6) & 0xf;
-	if (code <= 0 || code > maxcode)
-		return 0;
-
-	/* Make it the requested signal. */
-	*sigp = sig;
-	*codep = code;
-	return 1;
-}
-
-static const char *const int_name[] = {
-	[INT_MEM_ERROR] = "Memory error",
-	[INT_ILL] = "Illegal instruction",
-	[INT_GPV] = "General protection violation",
-	[INT_UDN_ACCESS] = "UDN access",
-	[INT_IDN_ACCESS] = "IDN access",
-#if CHIP_HAS_SN()
-	[INT_SN_ACCESS] = "SN access",
-#endif
-	[INT_SWINT_3] = "Software interrupt 3",
-	[INT_SWINT_2] = "Software interrupt 2",
-	[INT_SWINT_0] = "Software interrupt 0",
-	[INT_UNALIGN_DATA] = "Unaligned data",
-	[INT_DOUBLE_FAULT] = "Double fault",
-#ifdef __tilegx__
-	[INT_ILL_TRANS] = "Illegal virtual address",
-#endif
-};
-
-static int do_bpt(struct pt_regs *regs)
-{
-	unsigned long bundle, bcode, bpt;
-
-	bundle = *(unsigned long *)instruction_pointer(regs);
-
-	/*
-	 * bpt shoule be { bpt; nop }, which is 0x286a44ae51485000ULL.
-	 * we encode the unused least significant bits for other purpose.
-	 */
-	bpt = bundle & ~((1ULL << 12) - 1);
-	if (bpt != TILE_BPT_BUNDLE)
-		return 0;
-
-	bcode = bundle & ((1ULL << 12) - 1);
-	/*
-	 * notify the kprobe handlers, if instruction is likely to
-	 * pertain to them.
-	 */
-	switch (bcode) {
-	/* breakpoint_insn */
-	case 0:
-		notify_die(DIE_BREAK, "debug", regs, bundle,
-			INT_ILL, SIGTRAP);
-		break;
-	/* compiled_bpt */
-	case DIE_COMPILED_BPT:
-		notify_die(DIE_COMPILED_BPT, "debug", regs, bundle,
-			INT_ILL, SIGTRAP);
-		break;
-	/* breakpoint2_insn */
-	case DIE_SSTEPBP:
-		notify_die(DIE_SSTEPBP, "single_step", regs, bundle,
-			INT_ILL, SIGTRAP);
-		break;
-	default:
-		return 0;
-	}
-
-	return 1;
-}
-
-void __kprobes do_trap(struct pt_regs *regs, int fault_num,
-		       unsigned long reason)
-{
-	siginfo_t info;
-	int signo, code;
-	unsigned long address = 0;
-	tile_bundle_bits instr;
-	int is_kernel = !user_mode(regs);
-
-	clear_siginfo(&info);
-
-	/* Handle breakpoints, etc. */
-	if (is_kernel && fault_num == INT_ILL && do_bpt(regs))
-		return;
-
-	/* Re-enable interrupts, if they were previously enabled. */
-	if (!(regs->flags & PT_FLAGS_DISABLE_IRQ))
-		local_irq_enable();
-
-	/*
-	 * If it hits in kernel mode and we can't fix it up, just exit the
-	 * current process and hope for the best.
-	 */
-	if (is_kernel) {
-		const char *name;
-		char buf[100];
-		if (fixup_exception(regs))  /* ILL_TRANS or UNALIGN_DATA */
-			return;
-		if (fault_num >= 0 &&
-		    fault_num < ARRAY_SIZE(int_name) &&
-		    int_name[fault_num] != NULL)
-			name = int_name[fault_num];
-		else
-			name = "Unknown interrupt";
-		if (fault_num == INT_GPV)
-			snprintf(buf, sizeof(buf), "; GPV_REASON %#lx", reason);
-#ifdef __tilegx__
-		else if (fault_num == INT_ILL_TRANS)
-			snprintf(buf, sizeof(buf), "; address %#lx", reason);
-#endif
-		else
-			buf[0] = '\0';
-		pr_alert("Kernel took bad trap %d (%s) at PC %#lx%s\n",
-			 fault_num, name, regs->pc, buf);
-		show_regs(regs);
-		do_exit(SIGKILL);  /* FIXME: implement i386 die() */
-	}
-
-	switch (fault_num) {
-	case INT_MEM_ERROR:
-		signo = SIGBUS;
-		code = BUS_OBJERR;
-		break;
-	case INT_ILL:
-		if (copy_from_user(&instr, (void __user *)regs->pc,
-				   sizeof(instr))) {
-			pr_err("Unreadable instruction for INT_ILL: %#lx\n",
-			       regs->pc);
-			do_exit(SIGKILL);
-		}
-		if (!special_ill(instr, &signo, &code)) {
-			signo = SIGILL;
-			code = ILL_ILLOPC;
-		}
-		address = regs->pc;
-		break;
-	case INT_GPV:
-#if CHIP_HAS_TILE_DMA()
-		if (retry_gpv(reason))
-			return;
-#endif
-		/*FALLTHROUGH*/
-	case INT_UDN_ACCESS:
-	case INT_IDN_ACCESS:
-#if CHIP_HAS_SN()
-	case INT_SN_ACCESS:
-#endif
-		signo = SIGILL;
-		code = ILL_PRVREG;
-		address = regs->pc;
-		break;
-	case INT_SWINT_3:
-	case INT_SWINT_2:
-	case INT_SWINT_0:
-		signo = SIGILL;
-		code = ILL_ILLTRP;
-		address = regs->pc;
-		break;
-	case INT_UNALIGN_DATA:
-#ifndef __tilegx__  /* Emulated support for single step debugging */
-		if (unaligned_fixup >= 0) {
-			struct single_step_state *state =
-				current_thread_info()->step_state;
-			if (!state ||
-			    (void __user *)(regs->pc) != state->buffer) {
-				single_step_once(regs);
-				return;
-			}
-		}
-#endif
-		signo = SIGBUS;
-		code = BUS_ADRALN;
-		address = 0;
-		break;
-	case INT_DOUBLE_FAULT:
-		/*
-		 * For double fault, "reason" is actually passed as
-		 * SYSTEM_SAVE_K_2, the hypervisor's double-fault info, so
-		 * we can provide the original fault number rather than
-		 * the uninteresting "INT_DOUBLE_FAULT" so the user can
-		 * learn what actually struck while PL0 ICS was set.
-		 */
-		fault_num = reason;
-		signo = SIGILL;
-		code = ILL_DBLFLT;
-		address = regs->pc;
-		break;
-#ifdef __tilegx__
-	case INT_ILL_TRANS: {
-		/* Avoid a hardware erratum with the return address stack. */
-		fill_ra_stack();
-
-		signo = SIGSEGV;
-		address = reason;
-		code = SEGV_MAPERR;
-		break;
-	}
-#endif
-	default:
-		panic("Unexpected do_trap interrupt number %d", fault_num);
-	}
-
-	info.si_signo = signo;
-	info.si_code = code;
-	info.si_addr = (void __user *)address;
-	if (signo == SIGILL)
-		info.si_trapno = fault_num;
-	if (signo != SIGTRAP)
-		trace_unhandled_signal("trap", regs, address, signo);
-	force_sig_info(signo, &info, current);
-}
-
-void do_nmi(struct pt_regs *regs, int fault_num, unsigned long reason)
-{
-	nmi_enter();
-	switch (reason) {
-#ifdef arch_trigger_cpumask_backtrace
-	case TILE_NMI_DUMP_STACK:
-		nmi_cpu_backtrace(regs);
-		break;
-#endif
-	default:
-		panic("Unexpected do_nmi type %ld", reason);
-	}
-	nmi_exit();
-}
-
-/* Deprecated function currently only used here. */
-extern void _dump_stack(int dummy, ulong pc, ulong lr, ulong sp, ulong r52);
-
-void kernel_double_fault(int dummy, ulong pc, ulong lr, ulong sp, ulong r52)
-{
-	_dump_stack(dummy, pc, lr, sp, r52);
-	pr_emerg("Double fault: exiting\n");
-	machine_halt();
-}