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+/*
+ * File: arch/blackfin/mach-common/entry.S
+ * Based on:
+ * Author: Linus Torvalds
+ *
+ * Created: ?
+ * Description: contains the system-call and fault low-level handling routines.
+ * This also contains the timer-interrupt handler, as well as all
+ * interrupts and faults that can result in a task-switch.
+ *
+ * Modified:
+ * Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * 25-Dec-2004 - LG Soft India
+ * 1. Fix in return_from_int, to make sure any pending
+ * system call in ILAT for this process to get
+ * executed, otherwise in case context switch happens,
+ * system call of first process (i.e in ILAT) will be
+ * carried forward to the switched process.
+ * 2. Removed Constant references for the following
+ * a. IPEND
+ * b. EXCAUSE mask
+ * c. PAGE Mask
+ */
+
+/*
+ * NOTE: This code handles signal-recognition, which happens every time
+ * after a timer-interrupt and after each system call.
+ */
+
+
+#include <linux/linkage.h>
+#include <asm/blackfin.h>
+#include <asm/unistd.h>
+#include <asm/errno.h>
+#include <asm/thread_info.h> /* TIF_NEED_RESCHED */
+#include <asm/asm-offsets.h>
+
+#include <asm/mach-common/context.S>
+
+#ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
+ /*
+ * TODO: this should be proper save/restore, but for now
+ * we'll just cheat and use 0x1/0x13
+ */
+# define DEBUG_START_HWTRACE \
+ P5.l = LO(TBUFCTL); \
+ P5.h = HI(TBUFCTL); \
+ R7 = 0x13; \
+ [P5] = R7;
+# define DEBUG_STOP_HWTRACE \
+ P5.l = LO(TBUFCTL); \
+ P5.h = HI(TBUFCTL); \
+ R7 = 0x01; \
+ [P5] = R7;
+#else
+# define DEBUG_START_HWTRACE
+# define DEBUG_STOP_HWTRACE
+#endif
+
+#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
+.section .l1.text
+#else
+.text
+#endif
+
+/* Slightly simplified and streamlined entry point for CPLB misses.
+ * This one does not lower the level to IRQ5, and thus can be used to
+ * patch up CPLB misses on the kernel stack.
+ */
+ENTRY(_ex_dcplb)
+#if defined(ANOMALY_05000261)
+ /*
+ * Work around an anomaly: if we see a new DCPLB fault, return
+ * without doing anything. Then, if we get the same fault again,
+ * handle it.
+ */
+ p5.l = _last_cplb_fault_retx;
+ p5.h = _last_cplb_fault_retx;
+ r7 = [p5];
+ r6 = retx;
+ [p5] = r6;
+ cc = r6 == r7;
+ if !cc jump _return_from_exception;
+ /* fall through */
+#endif
+
+ENTRY(_ex_icplb)
+ (R7:6,P5:4) = [sp++];
+ ASTAT = [sp++];
+ SAVE_ALL_SYS
+ call __cplb_hdr;
+ DEBUG_START_HWTRACE
+ RESTORE_ALL_SYS
+ SP = RETN;
+ rtx;
+
+ENTRY(_ex_spinlock)
+ /* Transform this into a syscall - twiddle the syscall vector. */
+ p5.l = lo(EVT15);
+ p5.h = hi(EVT15);
+ r7.l = _spinlock_bh;
+ r7.h = _spinlock_bh;
+ [p5] = r7;
+ csync;
+ /* Fall through. */
+
+ENTRY(_ex_syscall)
+ DEBUG_START_HWTRACE
+ (R7:6,P5:4) = [sp++];
+ ASTAT = [sp++];
+ raise 15; /* invoked by TRAP #0, for sys call */
+ sp = retn;
+ rtx
+
+ENTRY(_spinlock_bh)
+ SAVE_ALL_SYS
+ /* To end up here, vector 15 was changed - so we have to change it
+ * back.
+ */
+ p0.l = lo(EVT15);
+ p0.h = hi(EVT15);
+ p1.l = _evt_system_call;
+ p1.h = _evt_system_call;
+ [p0] = p1;
+ csync;
+ r0 = [sp + PT_R0];
+ sp += -12;
+ call _sys_bfin_spinlock;
+ sp += 12;
+ [SP + PT_R0] = R0;
+ RESTORE_ALL_SYS
+ rti;
+
+ENTRY(_ex_soft_bp)
+ r7 = retx;
+ r7 += -2;
+ retx = r7;
+ jump.s _ex_trap_c;
+
+ENTRY(_ex_single_step)
+ r7 = retx;
+ r6 = reti;
+ cc = r7 == r6;
+ if cc jump _return_from_exception
+ r7 = syscfg;
+ bitclr (r7, 0);
+ syscfg = R7;
+
+ p5.l = lo(IPEND);
+ p5.h = hi(IPEND);
+ r6 = [p5];
+ cc = bittst(r6, 5);
+ if !cc jump _ex_trap_c;
+ p4.l = lo(EVT5);
+ p4.h = hi(EVT5);
+ r6.h = _exception_to_level5;
+ r6.l = _exception_to_level5;
+ r7 = [p4];
+ cc = r6 == r7;
+ if !cc jump _ex_trap_c;
+
+_return_from_exception:
+ DEBUG_START_HWTRACE
+ (R7:6,P5:4) = [sp++];
+ ASTAT = [sp++];
+ sp = retn;
+ rtx;
+
+ENTRY(_handle_bad_cplb)
+ /* To get here, we just tried and failed to change a CPLB
+ * so, handle things in trap_c (C code), by lowering to
+ * IRQ5, just like we normally do. Since this is not a
+ * "normal" return path, we have a do alot of stuff to
+ * the stack to get ready so, we can fall through - we
+ * need to make a CPLB exception look like a normal exception
+ */
+
+ DEBUG_START_HWTRACE
+ RESTORE_ALL_SYS
+ [--sp] = ASTAT;
+ [--sp] = (R7:6, P5:4);
+
+ENTRY(_ex_trap_c)
+ /* Call C code (trap_c) to handle the exception, which most
+ * likely involves sending a signal to the current process.
+ * To avoid double faults, lower our priority to IRQ5 first.
+ */
+ P5.h = _exception_to_level5;
+ P5.l = _exception_to_level5;
+ p4.l = lo(EVT5);
+ p4.h = hi(EVT5);
+ [p4] = p5;
+ csync;
+
+ /* Disable all interrupts, but make sure level 5 is enabled so
+ * we can switch to that level. Save the old mask. */
+ cli r6;
+ p4.l = _excpt_saved_imask;
+ p4.h = _excpt_saved_imask;
+ [p4] = r6;
+ r6 = 0x3f;
+ sti r6;
+
+ /* Save the excause into a circular buffer, in case the instruction
+ * which caused this excecptions causes others.
+ */
+ P5.l = _in_ptr_excause;
+ P5.h = _in_ptr_excause;
+ R7 = [P5];
+ R7 += 4;
+ R6 = 0xF;
+ R7 = R7 & R6;
+ [P5] = R7;
+ R6.l = _excause_circ_buf;
+ R6.h = _excause_circ_buf;
+ R7 = R7 + R6;
+ p5 = R7;
+ R6 = SEQSTAT;
+ [P5] = R6;
+
+ DEBUG_START_HWTRACE
+ (R7:6,P5:4) = [sp++];
+ ASTAT = [sp++];
+ SP = RETN;
+ raise 5;
+ rtx;
+
+ENTRY(_exception_to_level5)
+ SAVE_ALL_SYS
+
+ /* Restore interrupt mask. We haven't pushed RETI, so this
+ * doesn't enable interrupts until we return from this handler. */
+ p4.l = _excpt_saved_imask;
+ p4.h = _excpt_saved_imask;
+ r6 = [p4];
+ sti r6;
+
+ /* Restore the hardware error vector. */
+ P5.h = _evt_ivhw;
+ P5.l = _evt_ivhw;
+ p4.l = lo(EVT5);
+ p4.h = hi(EVT5);
+ [p4] = p5;
+ csync;
+
+ p2.l = lo(IPEND);
+ p2.h = hi(IPEND);
+ csync;
+ r0 = [p2]; /* Read current IPEND */
+ [sp + PT_IPEND] = r0; /* Store IPEND */
+
+ /* Pop the excause from the circular buffer and push it on the stack
+ * (in the right place - if you change the location of SEQSTAT, you
+ * must change this offset.
+ */
+.L_excep_to_5_again:
+ P5.l = _out_ptr_excause;
+ P5.h = _out_ptr_excause;
+ R7 = [P5];
+ R7 += 4;
+ R6 = 0xF;
+ R7 = R7 & R6;
+ [P5] = R7;
+ R6.l = _excause_circ_buf;
+ R6.h = _excause_circ_buf;
+ R7 = R7 + R6;
+ P5 = R7;
+ R1 = [P5];
+ [SP + 8] = r1;
+
+ r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
+ SP += -12;
+ call _trap_c;
+ SP += 12;
+
+ /* See if anything else is in the exception buffer
+ * if there is, process it
+ */
+ P5.l = _out_ptr_excause;
+ P5.h = _out_ptr_excause;
+ P4.l = _in_ptr_excause;
+ P4.h = _in_ptr_excause;
+ R6 = [P5];
+ R7 = [P4];
+ CC = R6 == R7;
+ if ! CC JUMP .L_excep_to_5_again
+
+ call _ret_from_exception;
+ RESTORE_ALL_SYS
+ rti;
+
+ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
+ /* Since the kernel stack can be anywhere, it's not guaranteed to be
+ * covered by a CPLB. Switch to an exception stack; use RETN as a
+ * scratch register (for want of a better option).
+ */
+ retn = sp;
+ sp.l = _exception_stack_top;
+ sp.h = _exception_stack_top;
+ /* Try to deal with syscalls quickly. */
+ [--sp] = ASTAT;
+ [--sp] = (R7:6, P5:4);
+ DEBUG_STOP_HWTRACE
+ r7 = SEQSTAT; /* reason code is in bit 5:0 */
+ r6.l = lo(SEQSTAT_EXCAUSE);
+ r6.h = hi(SEQSTAT_EXCAUSE);
+ r7 = r7 & r6;
+ p5.h = _extable;
+ p5.l = _extable;
+ p4 = r7;
+ p5 = p5 + (p4 << 2);
+ p4 = [p5];
+ jump (p4);
+
+.Lbadsys:
+ r7 = -ENOSYS; /* signextending enough */
+ [sp + PT_R0] = r7; /* return value from system call */
+ jump .Lsyscall_really_exit;
+
+ENTRY(_kernel_execve)
+ link SIZEOF_PTREGS;
+ p0 = sp;
+ r3 = SIZEOF_PTREGS / 4;
+ r4 = 0(x);
+0:
+ [p0++] = r4;
+ r3 += -1;
+ cc = r3 == 0;
+ if !cc jump 0b (bp);
+
+ p0 = sp;
+ sp += -16;
+ [sp + 12] = p0;
+ call _do_execve;
+ SP += 16;
+ cc = r0 == 0;
+ if ! cc jump 1f;
+ /* Success. Copy our temporary pt_regs to the top of the kernel
+ * stack and do a normal exception return.
+ */
+ r1 = sp;
+ r0 = (-KERNEL_STACK_SIZE) (x);
+ r1 = r1 & r0;
+ p2 = r1;
+ p3 = [p2];
+ r0 = KERNEL_STACK_SIZE - 4 (z);
+ p1 = r0;
+ p1 = p1 + p2;
+
+ p0 = fp;
+ r4 = [p0--];
+ r3 = SIZEOF_PTREGS / 4;
+0:
+ r4 = [p0--];
+ [p1--] = r4;
+ r3 += -1;
+ cc = r3 == 0;
+ if ! cc jump 0b (bp);
+
+ r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
+ p1 = r0;
+ p1 = p1 + p2;
+ sp = p1;
+ r0 = syscfg;
+ [SP + PT_SYSCFG] = r0;
+ [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
+
+ RESTORE_CONTEXT;
+ rti;
+1:
+ unlink;
+ rts;
+
+ENTRY(_system_call)
+ /* Store IPEND */
+ p2.l = lo(IPEND);
+ p2.h = hi(IPEND);
+ csync;
+ r0 = [p2];
+ [sp + PT_IPEND] = r0;
+
+ /* Store RETS for now */
+ r0 = rets;
+ [sp + PT_RESERVED] = r0;
+ /* Set the stack for the current process */
+ r7 = sp;
+ r6.l = lo(ALIGN_PAGE_MASK);
+ r6.h = hi(ALIGN_PAGE_MASK);
+ r7 = r7 & r6; /* thread_info */
+ p2 = r7;
+ p2 = [p2];
+
+ [p2+(TASK_THREAD+THREAD_KSP)] = sp;
+
+ /* Check the System Call */
+ r7 = __NR_syscall;
+ /* System call number is passed in P0 */
+ r6 = p0;
+ cc = r6 < r7;
+ if ! cc jump .Lbadsys;
+
+ /* are we tracing syscalls?*/
+ r7 = sp;
+ r6.l = lo(ALIGN_PAGE_MASK);
+ r6.h = hi(ALIGN_PAGE_MASK);
+ r7 = r7 & r6;
+ p2 = r7;
+ r7 = [p2+TI_FLAGS];
+ CC = BITTST(r7,TIF_SYSCALL_TRACE);
+ if CC JUMP _sys_trace;
+
+ /* Execute the appropriate system call */
+
+ p4 = p0;
+ p5.l = _sys_call_table;
+ p5.h = _sys_call_table;
+ p5 = p5 + (p4 << 2);
+ r0 = [sp + PT_R0];
+ r1 = [sp + PT_R1];
+ r2 = [sp + PT_R2];
+ p5 = [p5];
+
+ [--sp] = r5;
+ [--sp] = r4;
+ [--sp] = r3;
+ SP += -12;
+ call (p5);
+ SP += 24;
+ [sp + PT_R0] = r0;
+
+.Lresume_userspace:
+ r7 = sp;
+ r4.l = lo(ALIGN_PAGE_MASK);
+ r4.h = hi(ALIGN_PAGE_MASK);
+ r7 = r7 & r4; /* thread_info->flags */
+ p5 = r7;
+.Lresume_userspace_1:
+ /* Disable interrupts. */
+ [--sp] = reti;
+ reti = [sp++];
+
+ r7 = [p5 + TI_FLAGS];
+ r4.l = lo(_TIF_WORK_MASK);
+ r4.h = hi(_TIF_WORK_MASK);
+ r7 = r7 & r4;
+
+.Lsyscall_resched:
+ cc = BITTST(r7, TIF_NEED_RESCHED);
+ if !cc jump .Lsyscall_sigpending;
+
+ /* Reenable interrupts. */
+ [--sp] = reti;
+ r0 = [sp++];
+
+ SP += -12;
+ call _schedule;
+ SP += 12;
+
+ jump .Lresume_userspace_1;
+
+.Lsyscall_sigpending:
+ cc = BITTST(r7, TIF_RESTORE_SIGMASK);
+ if cc jump .Lsyscall_do_signals;
+ cc = BITTST(r7, TIF_SIGPENDING);
+ if !cc jump .Lsyscall_really_exit;
+.Lsyscall_do_signals:
+ /* Reenable interrupts. */
+ [--sp] = reti;
+ r0 = [sp++];
+
+ r0 = sp;
+ SP += -12;
+ call _do_signal;
+ SP += 12;
+
+.Lsyscall_really_exit:
+ r5 = [sp + PT_RESERVED];
+ rets = r5;
+ rts;
+
+_sys_trace:
+ call _syscall_trace;
+
+ /* Execute the appropriate system call */
+
+ p4 = [SP + PT_P0];
+ p5.l = _sys_call_table;
+ p5.h = _sys_call_table;
+ p5 = p5 + (p4 << 2);
+ r0 = [sp + PT_R0];
+ r1 = [sp + PT_R1];
+ r2 = [sp + PT_R2];
+ r3 = [sp + PT_R3];
+ r4 = [sp + PT_R4];
+ r5 = [sp + PT_R5];
+ p5 = [p5];
+
+ [--sp] = r5;
+ [--sp] = r4;
+ [--sp] = r3;
+ SP += -12;
+ call (p5);
+ SP += 24;
+ [sp + PT_R0] = r0;
+
+ call _syscall_trace;
+ jump .Lresume_userspace;
+
+ENTRY(_resume)
+ /*
+ * Beware - when entering resume, prev (the current task) is
+ * in r0, next (the new task) is in r1.
+ */
+ p0 = r0;
+ p1 = r1;
+ [--sp] = rets;
+ [--sp] = fp;
+ [--sp] = (r7:4, p5:3);
+
+ /* save usp */
+ p2 = usp;
+ [p0+(TASK_THREAD+THREAD_USP)] = p2;
+
+ /* save current kernel stack pointer */
+ [p0+(TASK_THREAD+THREAD_KSP)] = sp;
+
+ /* save program counter */
+ r1.l = _new_old_task;
+ r1.h = _new_old_task;
+ [p0+(TASK_THREAD+THREAD_PC)] = r1;
+
+ /* restore the kernel stack pointer */
+ sp = [p1+(TASK_THREAD+THREAD_KSP)];
+
+ /* restore user stack pointer */
+ p0 = [p1+(TASK_THREAD+THREAD_USP)];
+ usp = p0;
+
+ /* restore pc */
+ p0 = [p1+(TASK_THREAD+THREAD_PC)];
+ jump (p0);
+
+ /*
+ * Following code actually lands up in a new (old) task.
+ */
+
+_new_old_task:
+ (r7:4, p5:3) = [sp++];
+ fp = [sp++];
+ rets = [sp++];
+
+ /*
+ * When we come out of resume, r0 carries "old" task, becuase we are
+ * in "new" task.
+ */
+ rts;
+
+ENTRY(_ret_from_exception)
+ p2.l = lo(IPEND);
+ p2.h = hi(IPEND);
+
+ csync;
+ r0 = [p2];
+ [sp + PT_IPEND] = r0;
+
+1:
+ r1 = 0x37(Z);
+ r2 = ~r1;
+ r2.h = 0;
+ r0 = r2 & r0;
+ cc = r0 == 0;
+ if !cc jump 4f; /* if not return to user mode, get out */
+
+ /* Make sure any pending system call or deferred exception
+ * return in ILAT for this process to get executed, otherwise
+ * in case context switch happens, system call of
+ * first process (i.e in ILAT) will be carried
+ * forward to the switched process
+ */
+
+ p2.l = lo(ILAT);
+ p2.h = hi(ILAT);
+ r0 = [p2];
+ r1 = (EVT_IVG14 | EVT_IVG15) (z);
+ r0 = r0 & r1;
+ cc = r0 == 0;
+ if !cc jump 5f;
+
+ /* Set the stack for the current process */
+ r7 = sp;
+ r4.l = lo(ALIGN_PAGE_MASK);
+ r4.h = hi(ALIGN_PAGE_MASK);
+ r7 = r7 & r4; /* thread_info->flags */
+ p5 = r7;
+ r7 = [p5 + TI_FLAGS];
+ r4.l = lo(_TIF_WORK_MASK);
+ r4.h = hi(_TIF_WORK_MASK);
+ r7 = r7 & r4;
+ cc = r7 == 0;
+ if cc jump 4f;
+
+ p0.l = lo(EVT15);
+ p0.h = hi(EVT15);
+ p1.l = _schedule_and_signal;
+ p1.h = _schedule_and_signal;
+ [p0] = p1;
+ csync;
+ raise 15; /* raise evt14 to do signal or reschedule */
+4:
+ r0 = syscfg;
+ bitclr(r0, 0);
+ syscfg = r0;
+5:
+ rts;
+
+ENTRY(_return_from_int)
+ /* If someone else already raised IRQ 15, do nothing. */
+ csync;
+ p2.l = lo(ILAT);
+ p2.h = hi(ILAT);
+ r0 = [p2];
+ cc = bittst (r0, EVT_IVG15_P);
+ if cc jump 2f;
+
+ /* if not return to user mode, get out */
+ p2.l = lo(IPEND);
+ p2.h = hi(IPEND);
+ r0 = [p2];
+ r1 = 0x17(Z);
+ r2 = ~r1;
+ r2.h = 0;
+ r0 = r2 & r0;
+ r1 = 1;
+ r1 = r0 - r1;
+ r2 = r0 & r1;
+ cc = r2 == 0;
+ if !cc jump 2f;
+
+ /* Lower the interrupt level to 15. */
+ p0.l = lo(EVT15);
+ p0.h = hi(EVT15);
+ p1.l = _schedule_and_signal_from_int;
+ p1.h = _schedule_and_signal_from_int;
+ [p0] = p1;
+ csync;
+#if defined(ANOMALY_05000281)
+ r0.l = lo(CONFIG_BOOT_LOAD);
+ r0.h = hi(CONFIG_BOOT_LOAD);
+ reti = r0;
+#endif
+ r0 = 0x801f (z);
+ STI r0;
+ raise 15; /* raise evt15 to do signal or reschedule */
+ rti;
+2:
+ rts;
+
+ENTRY(_lower_to_irq14)
+#if defined(ANOMALY_05000281)
+ r0.l = lo(CONFIG_BOOT_LOAD);
+ r0.h = hi(CONFIG_BOOT_LOAD);
+ reti = r0;
+#endif
+ r0 = 0x401f;
+ sti r0;
+ raise 14;
+ rti;
+ENTRY(_evt14_softirq)
+#ifdef CONFIG_DEBUG_HWERR
+ r0 = 0x3f;
+ sti r0;
+#else
+ cli r0;
+#endif
+ [--sp] = RETI;
+ SP += 4;
+ rts;
+
+_schedule_and_signal_from_int:
+ /* To end up here, vector 15 was changed - so we have to change it
+ * back.
+ */
+ p0.l = lo(EVT15);
+ p0.h = hi(EVT15);
+ p1.l = _evt_system_call;
+ p1.h = _evt_system_call;
+ [p0] = p1;
+ csync;
+ p1 = rets;
+ [sp + PT_RESERVED] = p1;
+
+ p0.l = _irq_flags;
+ p0.h = _irq_flags;
+ r0 = [p0];
+ sti r0;
+
+ jump.s .Lresume_userspace;
+
+_schedule_and_signal:
+ SAVE_CONTEXT_SYSCALL
+ /* To end up here, vector 15 was changed - so we have to change it
+ * back.
+ */
+ p0.l = lo(EVT15);
+ p0.h = hi(EVT15);
+ p1.l = _evt_system_call;
+ p1.h = _evt_system_call;
+ [p0] = p1;
+ csync;
+ p0.l = 1f;
+ p0.h = 1f;
+ [sp + PT_RESERVED] = P0;
+ call .Lresume_userspace;
+1:
+ RESTORE_CONTEXT
+ rti;
+
+/* Make sure when we start, that the circular buffer is initialized properly
+ * R0 and P0 are call clobbered, so we can use them here.
+ */
+ENTRY(_init_exception_buff)
+ r0 = 0;
+ p0.h = _in_ptr_excause;
+ p0.l = _in_ptr_excause;
+ [p0] = r0;
+ p0.h = _out_ptr_excause;
+ p0.l = _out_ptr_excause;
+ [p0] = r0;
+ rts;
+
+/*
+ * Put these in the kernel data section - that should always be covered by
+ * a CPLB. This is needed to ensure we don't get double fault conditions
+ */
+
+#ifdef CONFIG_SYSCALL_TAB_L1
+.section .l1.data
+#else
+.data
+#endif
+ALIGN
+_extable:
+ /* entry for each EXCAUSE[5:0]
+ * This table bmust be in sync with the table in ./kernel/traps.c
+ * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
+ */
+ .long _ex_syscall; /* 0x00 - User Defined - Linux Syscall */
+ .long _ex_soft_bp /* 0x01 - User Defined - Software breakpoint */
+ .long _ex_trap_c /* 0x02 - User Defined */
+ .long _ex_trap_c /* 0x03 - User Defined - Atomic test and set service */
+ .long _ex_spinlock /* 0x04 - User Defined */
+ .long _ex_trap_c /* 0x05 - User Defined */
+ .long _ex_trap_c /* 0x06 - User Defined */
+ .long _ex_trap_c /* 0x07 - User Defined */
+ .long _ex_trap_c /* 0x08 - User Defined */
+ .long _ex_trap_c /* 0x09 - User Defined */
+ .long _ex_trap_c /* 0x0A - User Defined */
+ .long _ex_trap_c /* 0x0B - User Defined */
+ .long _ex_trap_c /* 0x0C - User Defined */
+ .long _ex_trap_c /* 0x0D - User Defined */
+ .long _ex_trap_c /* 0x0E - User Defined */
+ .long _ex_trap_c /* 0x0F - User Defined */
+ .long _ex_single_step /* 0x10 - HW Single step */
+ .long _ex_trap_c /* 0x11 - Trace Buffer Full */
+ .long _ex_trap_c /* 0x12 - Reserved */
+ .long _ex_trap_c /* 0x13 - Reserved */
+ .long _ex_trap_c /* 0x14 - Reserved */
+ .long _ex_trap_c /* 0x15 - Reserved */
+ .long _ex_trap_c /* 0x16 - Reserved */
+ .long _ex_trap_c /* 0x17 - Reserved */
+ .long _ex_trap_c /* 0x18 - Reserved */
+ .long _ex_trap_c /* 0x19 - Reserved */
+ .long _ex_trap_c /* 0x1A - Reserved */
+ .long _ex_trap_c /* 0x1B - Reserved */
+ .long _ex_trap_c /* 0x1C - Reserved */
+ .long _ex_trap_c /* 0x1D - Reserved */
+ .long _ex_trap_c /* 0x1E - Reserved */
+ .long _ex_trap_c /* 0x1F - Reserved */
+ .long _ex_trap_c /* 0x20 - Reserved */
+ .long _ex_trap_c /* 0x21 - Undefined Instruction */
+ .long _ex_trap_c /* 0x22 - Illegal Instruction Combination */
+ .long _ex_dcplb /* 0x23 - Data CPLB Protection Violation */
+ .long _ex_trap_c /* 0x24 - Data access misaligned */
+ .long _ex_trap_c /* 0x25 - Unrecoverable Event */
+ .long _ex_dcplb /* 0x26 - Data CPLB Miss */
+ .long _ex_trap_c /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
+ .long _ex_trap_c /* 0x28 - Emulation Watchpoint */
+ .long _ex_trap_c /* 0x29 - Instruction fetch access error (535 only) */
+ .long _ex_trap_c /* 0x2A - Instruction fetch misaligned */
+ .long _ex_icplb /* 0x2B - Instruction CPLB protection Violation */
+ .long _ex_icplb /* 0x2C - Instruction CPLB miss */
+ .long _ex_trap_c /* 0x2D - Instruction CPLB Multiple Hits */
+ .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
+ .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
+ .long _ex_trap_c /* 0x2F - Reserved */
+ .long _ex_trap_c /* 0x30 - Reserved */
+ .long _ex_trap_c /* 0x31 - Reserved */
+ .long _ex_trap_c /* 0x32 - Reserved */
+ .long _ex_trap_c /* 0x33 - Reserved */
+ .long _ex_trap_c /* 0x34 - Reserved */
+ .long _ex_trap_c /* 0x35 - Reserved */
+ .long _ex_trap_c /* 0x36 - Reserved */
+ .long _ex_trap_c /* 0x37 - Reserved */
+ .long _ex_trap_c /* 0x38 - Reserved */
+ .long _ex_trap_c /* 0x39 - Reserved */
+ .long _ex_trap_c /* 0x3A - Reserved */
+ .long _ex_trap_c /* 0x3B - Reserved */
+ .long _ex_trap_c /* 0x3C - Reserved */
+ .long _ex_trap_c /* 0x3D - Reserved */
+ .long _ex_trap_c /* 0x3E - Reserved */
+ .long _ex_trap_c /* 0x3F - Reserved */
+
+ALIGN
+ENTRY(_sys_call_table)
+ .long _sys_ni_syscall /* 0 - old "setup()" system call*/
+ .long _sys_exit
+ .long _sys_fork
+ .long _sys_read
+ .long _sys_write
+ .long _sys_open /* 5 */
+ .long _sys_close
+ .long _sys_ni_syscall /* old waitpid */
+ .long _sys_creat
+ .long _sys_link
+ .long _sys_unlink /* 10 */
+ .long _sys_execve
+ .long _sys_chdir
+ .long _sys_time
+ .long _sys_mknod
+ .long _sys_chmod /* 15 */
+ .long _sys_chown /* chown16 */
+ .long _sys_ni_syscall /* old break syscall holder */
+ .long _sys_ni_syscall /* old stat */
+ .long _sys_lseek
+ .long _sys_getpid /* 20 */
+ .long _sys_mount
+ .long _sys_ni_syscall /* old umount */
+ .long _sys_setuid
+ .long _sys_getuid
+ .long _sys_stime /* 25 */
+ .long _sys_ptrace
+ .long _sys_alarm
+ .long _sys_ni_syscall /* old fstat */
+ .long _sys_pause
+ .long _sys_ni_syscall /* old utime */ /* 30 */
+ .long _sys_ni_syscall /* old stty syscall holder */
+ .long _sys_ni_syscall /* old gtty syscall holder */
+ .long _sys_access
+ .long _sys_nice
+ .long _sys_ni_syscall /* 35 */ /* old ftime syscall holder */
+ .long _sys_sync
+ .long _sys_kill
+ .long _sys_rename
+ .long _sys_mkdir
+ .long _sys_rmdir /* 40 */
+ .long _sys_dup
+ .long _sys_pipe
+ .long _sys_times
+ .long _sys_ni_syscall /* old prof syscall holder */
+ .long _sys_brk /* 45 */
+ .long _sys_setgid
+ .long _sys_getgid
+ .long _sys_ni_syscall /* old sys_signal */
+ .long _sys_geteuid /* geteuid16 */
+ .long _sys_getegid /* getegid16 */ /* 50 */
+ .long _sys_acct
+ .long _sys_umount /* recycled never used phys() */
+ .long _sys_ni_syscall /* old lock syscall holder */
+ .long _sys_ioctl
+ .long _sys_fcntl /* 55 */
+ .long _sys_ni_syscall /* old mpx syscall holder */
+ .long _sys_setpgid
+ .long _sys_ni_syscall /* old ulimit syscall holder */
+ .long _sys_ni_syscall /* old old uname */
+ .long _sys_umask /* 60 */
+ .long _sys_chroot
+ .long _sys_ustat
+ .long _sys_dup2
+ .long _sys_getppid
+ .long _sys_getpgrp /* 65 */
+ .long _sys_setsid
+ .long _sys_ni_syscall /* old sys_sigaction */
+ .long _sys_sgetmask
+ .long _sys_ssetmask
+ .long _sys_setreuid /* setreuid16 */ /* 70 */
+ .long _sys_setregid /* setregid16 */
+ .long _sys_ni_syscall /* old sys_sigsuspend */
+ .long _sys_ni_syscall /* old sys_sigpending */
+ .long _sys_sethostname
+ .long _sys_setrlimit /* 75 */
+ .long _sys_ni_syscall /* old getrlimit */
+ .long _sys_getrusage
+ .long _sys_gettimeofday
+ .long _sys_settimeofday
+ .long _sys_getgroups /* getgroups16 */ /* 80 */
+ .long _sys_setgroups /* setgroups16 */
+ .long _sys_ni_syscall /* old_select */
+ .long _sys_symlink
+ .long _sys_ni_syscall /* old lstat */
+ .long _sys_readlink /* 85 */
+ .long _sys_uselib
+ .long _sys_ni_syscall /* sys_swapon */
+ .long _sys_reboot
+ .long _sys_ni_syscall /* old_readdir */
+ .long _sys_ni_syscall /* sys_mmap */ /* 90 */
+ .long _sys_munmap
+ .long _sys_truncate
+ .long _sys_ftruncate
+ .long _sys_fchmod
+ .long _sys_fchown /* fchown16 */ /* 95 */
+ .long _sys_getpriority
+ .long _sys_setpriority
+ .long _sys_ni_syscall /* old profil syscall holder */
+ .long _sys_statfs
+ .long _sys_fstatfs /* 100 */
+ .long _sys_ni_syscall
+ .long _sys_ni_syscall /* old sys_socketcall */
+ .long _sys_syslog
+ .long _sys_setitimer
+ .long _sys_getitimer /* 105 */
+ .long _sys_newstat
+ .long _sys_newlstat
+ .long _sys_newfstat
+ .long _sys_ni_syscall /* old uname */
+ .long _sys_ni_syscall /* iopl for i386 */ /* 110 */
+ .long _sys_vhangup
+ .long _sys_ni_syscall /* obsolete idle() syscall */
+ .long _sys_ni_syscall /* vm86old for i386 */
+ .long _sys_wait4
+ .long _sys_ni_syscall /* 115 */ /* sys_swapoff */
+ .long _sys_sysinfo
+ .long _sys_ni_syscall /* old sys_ipc */
+ .long _sys_fsync
+ .long _sys_ni_syscall /* old sys_sigreturn */
+ .long _sys_clone /* 120 */
+ .long _sys_setdomainname
+ .long _sys_newuname
+ .long _sys_ni_syscall /* old sys_modify_ldt */
+ .long _sys_adjtimex
+ .long _sys_ni_syscall /* 125 */ /* sys_mprotect */
+ .long _sys_ni_syscall /* old sys_sigprocmask */
+ .long _sys_ni_syscall /* old "creat_module" */
+ .long _sys_init_module
+ .long _sys_delete_module
+ .long _sys_ni_syscall /* 130: old "get_kernel_syms" */
+ .long _sys_quotactl
+ .long _sys_getpgid
+ .long _sys_fchdir
+ .long _sys_bdflush
+ .long _sys_ni_syscall /* 135 */ /* sys_sysfs */
+ .long _sys_personality
+ .long _sys_ni_syscall /* for afs_syscall */
+ .long _sys_setfsuid /* setfsuid16 */
+ .long _sys_setfsgid /* setfsgid16 */
+ .long _sys_llseek /* 140 */
+ .long _sys_getdents
+ .long _sys_ni_syscall /* sys_select */
+ .long _sys_flock
+ .long _sys_ni_syscall /* sys_msync */
+ .long _sys_readv /* 145 */
+ .long _sys_writev
+ .long _sys_getsid
+ .long _sys_fdatasync
+ .long _sys_sysctl
+ .long _sys_ni_syscall /* 150 */ /* sys_mlock */
+ .long _sys_ni_syscall /* sys_munlock */
+ .long _sys_ni_syscall /* sys_mlockall */
+ .long _sys_ni_syscall /* sys_munlockall */
+ .long _sys_sched_setparam
+ .long _sys_sched_getparam /* 155 */
+ .long _sys_sched_setscheduler
+ .long _sys_sched_getscheduler
+ .long _sys_sched_yield
+ .long _sys_sched_get_priority_max
+ .long _sys_sched_get_priority_min /* 160 */
+ .long _sys_sched_rr_get_interval
+ .long _sys_nanosleep
+ .long _sys_ni_syscall /* sys_mremap */
+ .long _sys_setresuid /* setresuid16 */
+ .long _sys_getresuid /* getresuid16 */ /* 165 */
+ .long _sys_ni_syscall /* for vm86 */
+ .long _sys_ni_syscall /* old "query_module" */
+ .long _sys_ni_syscall /* sys_poll */
+ .long _sys_ni_syscall /* sys_nfsservctl */
+ .long _sys_setresgid /* setresgid16 */ /* 170 */
+ .long _sys_getresgid /* getresgid16 */
+ .long _sys_prctl
+ .long _sys_rt_sigreturn
+ .long _sys_rt_sigaction
+ .long _sys_rt_sigprocmask /* 175 */
+ .long _sys_rt_sigpending
+ .long _sys_rt_sigtimedwait
+ .long _sys_rt_sigqueueinfo
+ .long _sys_rt_sigsuspend
+ .long _sys_pread64 /* 180 */
+ .long _sys_pwrite64
+ .long _sys_lchown /* lchown16 */
+ .long _sys_getcwd
+ .long _sys_capget
+ .long _sys_capset /* 185 */
+ .long _sys_sigaltstack
+ .long _sys_sendfile
+ .long _sys_ni_syscall /* streams1 */
+ .long _sys_ni_syscall /* streams2 */
+ .long _sys_vfork /* 190 */
+ .long _sys_getrlimit
+ .long _sys_mmap2
+ .long _sys_truncate64
+ .long _sys_ftruncate64
+ .long _sys_stat64 /* 195 */
+ .long _sys_lstat64
+ .long _sys_fstat64
+ .long _sys_chown
+ .long _sys_getuid
+ .long _sys_getgid /* 200 */
+ .long _sys_geteuid
+ .long _sys_getegid
+ .long _sys_setreuid
+ .long _sys_setregid
+ .long _sys_getgroups /* 205 */
+ .long _sys_setgroups
+ .long _sys_fchown
+ .long _sys_setresuid
+ .long _sys_getresuid
+ .long _sys_setresgid /* 210 */
+ .long _sys_getresgid
+ .long _sys_lchown
+ .long _sys_setuid
+ .long _sys_setgid
+ .long _sys_setfsuid /* 215 */
+ .long _sys_setfsgid
+ .long _sys_pivot_root
+ .long _sys_ni_syscall /* sys_mincore */
+ .long _sys_ni_syscall /* sys_madvise */
+ .long _sys_getdents64 /* 220 */
+ .long _sys_fcntl64
+ .long _sys_ni_syscall /* reserved for TUX */
+ .long _sys_ni_syscall
+ .long _sys_gettid
+ .long _sys_ni_syscall /* 225 */ /* sys_readahead */
+ .long _sys_setxattr
+ .long _sys_lsetxattr
+ .long _sys_fsetxattr
+ .long _sys_getxattr
+ .long _sys_lgetxattr /* 230 */
+ .long _sys_fgetxattr
+ .long _sys_listxattr
+ .long _sys_llistxattr
+ .long _sys_flistxattr
+ .long _sys_removexattr /* 235 */
+ .long _sys_lremovexattr
+ .long _sys_fremovexattr
+ .long _sys_tkill
+ .long _sys_sendfile64
+ .long _sys_futex /* 240 */
+ .long _sys_sched_setaffinity
+ .long _sys_sched_getaffinity
+ .long _sys_ni_syscall /* sys_set_thread_area */
+ .long _sys_ni_syscall /* sys_get_thread_area */
+ .long _sys_io_setup /* 245 */
+ .long _sys_io_destroy
+ .long _sys_io_getevents
+ .long _sys_io_submit
+ .long _sys_io_cancel
+ .long _sys_ni_syscall /* 250 */ /* sys_alloc_hugepages */
+ .long _sys_ni_syscall /* sys_freec_hugepages */
+ .long _sys_exit_group
+ .long _sys_lookup_dcookie
+ .long _sys_bfin_spinlock
+ .long _sys_epoll_create /* 255 */
+ .long _sys_epoll_ctl
+ .long _sys_epoll_wait
+ .long _sys_ni_syscall /* remap_file_pages */
+ .long _sys_set_tid_address
+ .long _sys_timer_create /* 260 */
+ .long _sys_timer_settime
+ .long _sys_timer_gettime
+ .long _sys_timer_getoverrun
+ .long _sys_timer_delete
+ .long _sys_clock_settime /* 265 */
+ .long _sys_clock_gettime
+ .long _sys_clock_getres
+ .long _sys_clock_nanosleep
+ .long _sys_statfs64
+ .long _sys_fstatfs64 /* 270 */
+ .long _sys_tgkill
+ .long _sys_utimes
+ .long _sys_fadvise64_64
+ .long _sys_ni_syscall /* vserver */
+ .long _sys_ni_syscall /* 275, mbind */
+ .long _sys_ni_syscall /* get_mempolicy */
+ .long _sys_ni_syscall /* set_mempolicy */
+ .long _sys_mq_open
+ .long _sys_mq_unlink
+ .long _sys_mq_timedsend /* 280 */
+ .long _sys_mq_timedreceive
+ .long _sys_mq_notify
+ .long _sys_mq_getsetattr
+ .long _sys_ni_syscall /* kexec_load */
+ .long _sys_waitid /* 285 */
+ .long _sys_add_key
+ .long _sys_request_key
+ .long _sys_keyctl
+ .long _sys_ioprio_set
+ .long _sys_ioprio_get /* 290 */
+ .long _sys_inotify_init
+ .long _sys_inotify_add_watch
+ .long _sys_inotify_rm_watch
+ .long _sys_ni_syscall /* migrate_pages */
+ .long _sys_openat /* 295 */
+ .long _sys_mkdirat
+ .long _sys_mknodat
+ .long _sys_fchownat
+ .long _sys_futimesat
+ .long _sys_fstatat64 /* 300 */
+ .long _sys_unlinkat
+ .long _sys_renameat
+ .long _sys_linkat
+ .long _sys_symlinkat
+ .long _sys_readlinkat /* 305 */
+ .long _sys_fchmodat
+ .long _sys_faccessat
+ .long _sys_pselect6
+ .long _sys_ppoll
+ .long _sys_unshare /* 310 */
+ .long _sys_sram_alloc
+ .long _sys_sram_free
+ .long _sys_dma_memcpy
+ .long _sys_accept
+ .long _sys_bind /* 315 */
+ .long _sys_connect
+ .long _sys_getpeername
+ .long _sys_getsockname
+ .long _sys_getsockopt
+ .long _sys_listen /* 320 */
+ .long _sys_recv
+ .long _sys_recvfrom
+ .long _sys_recvmsg
+ .long _sys_send
+ .long _sys_sendmsg /* 325 */
+ .long _sys_sendto
+ .long _sys_setsockopt
+ .long _sys_shutdown
+ .long _sys_socket
+ .long _sys_socketpair /* 330 */
+ .long _sys_semctl
+ .long _sys_semget
+ .long _sys_semop
+ .long _sys_msgctl
+ .long _sys_msgget /* 335 */
+ .long _sys_msgrcv
+ .long _sys_msgsnd
+ .long _sys_shmat
+ .long _sys_shmctl
+ .long _sys_shmdt /* 340 */
+ .long _sys_shmget
+ .rept NR_syscalls-(.-_sys_call_table)/4
+ .long _sys_ni_syscall
+ .endr
+_excpt_saved_imask:
+ .long 0;
+
+_exception_stack:
+ .rept 1024
+ .long 0;
+ .endr
+_exception_stack_top:
+
+#if defined(ANOMALY_05000261)
+/* Used by the assembly entry point to work around an anomaly. */
+_last_cplb_fault_retx:
+ .long 0;
+#endif
+/*
+ * Single instructions can have multiple faults, which need to be
+ * handled by traps.c, in irq5. We store the exception cause to ensure
+ * we don't miss a double fault condition
+ */
+ENTRY(_in_ptr_excause)
+ .long 0;
+ENTRY(_out_ptr_excause)
+ .long 0;
+ALIGN
+ENTRY(_excause_circ_buf)
+ .rept 4
+ .long 0
+ .endr
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