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+/*
+ * linux/arch/nios2/kernel/entry.S
+ *
+ * Copyright (C) 2013-2014 Altera Corporation
+ * Copyright (C) 2009, Wind River Systems Inc
+ *
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
+ * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
+ * Kenneth Albanowski <kjahds@kjahds.com>,
+ * Copyright (C) 2000 Lineo Inc. (www.lineo.com)
+ * Copyright (C) 2004 Microtronix Datacom Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Linux/m68k support by Hamish Macdonald
+ *
+ * 68060 fixes by Jesper Skov
+ * ColdFire support by Greg Ungerer (gerg@snapgear.com)
+ * 5307 fixes by David W. Miller
+ * linux 2.4 support David McCullough <davidm@snapgear.com>
+ */
+
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/asm-macros.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+#include <asm/setup.h>
+#include <asm/entry.h>
+#include <asm/unistd.h>
+#include <asm/processor.h>
+
+.macro GET_THREAD_INFO reg
+.if THREAD_SIZE & 0xffff0000
+ andhi \reg, sp, %hi(~(THREAD_SIZE-1))
+.else
+ addi \reg, r0, %lo(~(THREAD_SIZE-1))
+ and \reg, \reg, sp
+.endif
+.endm
+
+.macro kuser_cmpxchg_check
+ /*
+ * Make sure our user space atomic helper is restarted if it was
+ * interrupted in a critical region.
+ * ea-4 = address of interrupted insn (ea must be preserved).
+ * sp = saved regs.
+ * cmpxchg_ldw = first critical insn, cmpxchg_stw = last critical insn.
+ * If ea <= cmpxchg_stw and ea > cmpxchg_ldw then saved EA is set to
+ * cmpxchg_ldw + 4.
+ */
+ /* et = cmpxchg_stw + 4 */
+ movui et, (KUSER_BASE + 4 + (cmpxchg_stw - __kuser_helper_start))
+ bgtu ea, et, 1f
+
+ subi et, et, (cmpxchg_stw - cmpxchg_ldw) /* et = cmpxchg_ldw + 4 */
+ bltu ea, et, 1f
+ stw et, PT_EA(sp) /* fix up EA */
+ mov ea, et
+1:
+.endm
+
+.section .rodata
+.align 4
+exception_table:
+ .word unhandled_exception /* 0 - Reset */
+ .word unhandled_exception /* 1 - Processor-only Reset */
+ .word external_interrupt /* 2 - Interrupt */
+ .word handle_trap /* 3 - Trap Instruction */
+
+ .word instruction_trap /* 4 - Unimplemented instruction */
+ .word handle_illegal /* 5 - Illegal instruction */
+ .word handle_unaligned /* 6 - Misaligned data access */
+ .word handle_unaligned /* 7 - Misaligned destination address */
+
+ .word handle_diverror /* 8 - Division error */
+ .word protection_exception_ba /* 9 - Supervisor-only instr. address */
+ .word protection_exception_instr /* 10 - Supervisor only instruction */
+ .word protection_exception_ba /* 11 - Supervisor only data address */
+
+ .word unhandled_exception /* 12 - Double TLB miss (data) */
+ .word protection_exception_pte /* 13 - TLB permission violation (x) */
+ .word protection_exception_pte /* 14 - TLB permission violation (r) */
+ .word protection_exception_pte /* 15 - TLB permission violation (w) */
+
+ .word unhandled_exception /* 16 - MPU region violation */
+
+trap_table:
+ .word handle_system_call /* 0 */
+ .word handle_trap_1 /* 1 */
+ .word handle_trap_2 /* 2 */
+ .word handle_trap_3 /* 3 */
+ .word handle_trap_reserved /* 4 */
+ .word handle_trap_reserved /* 5 */
+ .word handle_trap_reserved /* 6 */
+ .word handle_trap_reserved /* 7 */
+ .word handle_trap_reserved /* 8 */
+ .word handle_trap_reserved /* 9 */
+ .word handle_trap_reserved /* 10 */
+ .word handle_trap_reserved /* 11 */
+ .word handle_trap_reserved /* 12 */
+ .word handle_trap_reserved /* 13 */
+ .word handle_trap_reserved /* 14 */
+ .word handle_trap_reserved /* 15 */
+ .word handle_trap_reserved /* 16 */
+ .word handle_trap_reserved /* 17 */
+ .word handle_trap_reserved /* 18 */
+ .word handle_trap_reserved /* 19 */
+ .word handle_trap_reserved /* 20 */
+ .word handle_trap_reserved /* 21 */
+ .word handle_trap_reserved /* 22 */
+ .word handle_trap_reserved /* 23 */
+ .word handle_trap_reserved /* 24 */
+ .word handle_trap_reserved /* 25 */
+ .word handle_trap_reserved /* 26 */
+ .word handle_trap_reserved /* 27 */
+ .word handle_trap_reserved /* 28 */
+ .word handle_trap_reserved /* 29 */
+#ifdef CONFIG_KGDB
+ .word handle_kgdb_breakpoint /* 30 KGDB breakpoint */
+#else
+ .word instruction_trap /* 30 */
+#endif
+ .word handle_breakpoint /* 31 */
+
+.text
+.set noat
+.set nobreak
+
+ENTRY(inthandler)
+ SAVE_ALL
+
+ kuser_cmpxchg_check
+
+ /* Clear EH bit before we get a new excpetion in the kernel
+ * and after we have saved it to the exception frame. This is done
+ * whether it's trap, tlb-miss or interrupt. If we don't do this
+ * estatus is not updated the next exception.
+ */
+ rdctl r24, status
+ movi r9, %lo(~STATUS_EH)
+ and r24, r24, r9
+ wrctl status, r24
+
+ /* Read cause and vector and branch to the associated handler */
+ mov r4, sp
+ rdctl r5, exception
+ movia r9, exception_table
+ add r24, r9, r5
+ ldw r24, 0(r24)
+ jmp r24
+
+
+/***********************************************************************
+ * Handle traps
+ ***********************************************************************
+ */
+ENTRY(handle_trap)
+ ldwio r24, -4(ea) /* instruction that caused the exception */
+ srli r24, r24, 4
+ andi r24, r24, 0x7c
+ movia r9,trap_table
+ add r24, r24, r9
+ ldw r24, 0(r24)
+ jmp r24
+
+
+/***********************************************************************
+ * Handle system calls
+ ***********************************************************************
+ */
+ENTRY(handle_system_call)
+ /* Enable interrupts */
+ rdctl r10, status
+ ori r10, r10, STATUS_PIE
+ wrctl status, r10
+
+ /* Reload registers destroyed by common code. */
+ ldw r4, PT_R4(sp)
+ ldw r5, PT_R5(sp)
+
+local_restart:
+ stw r2, PT_ORIG_R2(sp)
+ /* Check that the requested system call is within limits */
+ movui r1, __NR_syscalls
+ bgeu r2, r1, ret_invsyscall
+ slli r1, r2, 2
+ movhi r11, %hiadj(sys_call_table)
+ add r1, r1, r11
+ ldw r1, %lo(sys_call_table)(r1)
+
+ /* Check if we are being traced */
+ GET_THREAD_INFO r11
+ ldw r11,TI_FLAGS(r11)
+ BTBNZ r11,r11,TIF_SYSCALL_TRACE,traced_system_call
+
+ /* Execute the system call */
+ callr r1
+
+ /* If the syscall returns a negative result:
+ * Set r7 to 1 to indicate error,
+ * Negate r2 to get a positive error code
+ * If the syscall returns zero or a positive value:
+ * Set r7 to 0.
+ * The sigreturn system calls will skip the code below by
+ * adding to register ra. To avoid destroying registers
+ */
+translate_rc_and_ret:
+ movi r1, 0
+ bge r2, zero, 3f
+ ldw r1, PT_ORIG_R2(sp)
+ addi r1, r1, 1
+ beq r1, zero, 3f
+ sub r2, zero, r2
+ movi r1, 1
+3:
+ stw r2, PT_R2(sp)
+ stw r1, PT_R7(sp)
+end_translate_rc_and_ret:
+
+ret_from_exception:
+ ldw r1, PT_ESTATUS(sp)
+ /* if so, skip resched, signals */
+ TSTBNZ r1, r1, ESTATUS_EU, Luser_return
+
+restore_all:
+ rdctl r10, status /* disable intrs */
+ andi r10, r10, %lo(~STATUS_PIE)
+ wrctl status, r10
+ RESTORE_ALL
+ eret
+
+ /* If the syscall number was invalid return ENOSYS */
+ret_invsyscall:
+ movi r2, -ENOSYS
+ br translate_rc_and_ret
+
+ /* This implements the same as above, except it calls
+ * do_syscall_trace_enter and do_syscall_trace_exit before and after the
+ * syscall in order for utilities like strace and gdb to work.
+ */
+traced_system_call:
+ SAVE_SWITCH_STACK
+ call do_syscall_trace_enter
+ RESTORE_SWITCH_STACK
+
+ /* Create system call register arguments. The 5th and 6th
+ arguments on stack are already in place at the beginning
+ of pt_regs. */
+ ldw r2, PT_R2(sp)
+ ldw r4, PT_R4(sp)
+ ldw r5, PT_R5(sp)
+ ldw r6, PT_R6(sp)
+ ldw r7, PT_R7(sp)
+
+ /* Fetch the syscall function. */
+ movui r1, __NR_syscalls
+ bgeu r2, r1, traced_invsyscall
+ slli r1, r2, 2
+ movhi r11,%hiadj(sys_call_table)
+ add r1, r1, r11
+ ldw r1, %lo(sys_call_table)(r1)
+
+ callr r1
+
+ /* If the syscall returns a negative result:
+ * Set r7 to 1 to indicate error,
+ * Negate r2 to get a positive error code
+ * If the syscall returns zero or a positive value:
+ * Set r7 to 0.
+ * The sigreturn system calls will skip the code below by
+ * adding to register ra. To avoid destroying registers
+ */
+translate_rc_and_ret2:
+ movi r1, 0
+ bge r2, zero, 4f
+ ldw r1, PT_ORIG_R2(sp)
+ addi r1, r1, 1
+ beq r1, zero, 4f
+ sub r2, zero, r2
+ movi r1, 1
+4:
+ stw r2, PT_R2(sp)
+ stw r1, PT_R7(sp)
+end_translate_rc_and_ret2:
+ SAVE_SWITCH_STACK
+ call do_syscall_trace_exit
+ RESTORE_SWITCH_STACK
+ br ret_from_exception
+
+ /* If the syscall number was invalid return ENOSYS */
+traced_invsyscall:
+ movi r2, -ENOSYS
+ br translate_rc_and_ret2
+
+Luser_return:
+ GET_THREAD_INFO r11 /* get thread_info pointer */
+ ldw r10, TI_FLAGS(r11) /* get thread_info->flags */
+ ANDI32 r11, r10, _TIF_WORK_MASK
+ beq r11, r0, restore_all /* Nothing to do */
+ BTBZ r1, r10, TIF_NEED_RESCHED, Lsignal_return
+
+ /* Reschedule work */
+ call schedule
+ br ret_from_exception
+
+Lsignal_return:
+ ANDI32 r1, r10, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME
+ beq r1, r0, restore_all
+ mov r4, sp /* pt_regs */
+ SAVE_SWITCH_STACK
+ call do_notify_resume
+ beq r2, r0, no_work_pending
+ RESTORE_SWITCH_STACK
+ /* prepare restart syscall here without leaving kernel */
+ ldw r2, PT_R2(sp) /* reload syscall number in r2 */
+ ldw r4, PT_R4(sp) /* reload syscall arguments r4-r9 */
+ ldw r5, PT_R5(sp)
+ ldw r6, PT_R6(sp)
+ ldw r7, PT_R7(sp)
+ ldw r8, PT_R8(sp)
+ ldw r9, PT_R9(sp)
+ br local_restart /* restart syscall */
+
+no_work_pending:
+ RESTORE_SWITCH_STACK
+ br ret_from_exception
+
+/***********************************************************************
+ * Handle external interrupts.
+ ***********************************************************************
+ */
+/*
+ * This is the generic interrupt handler (for all hardware interrupt
+ * sources). It figures out the vector number and calls the appropriate
+ * interrupt service routine directly.
+ */
+external_interrupt:
+ rdctl r12, ipending
+ rdctl r9, ienable
+ and r12, r12, r9
+ /* skip if no interrupt is pending */
+ beq r12, r0, ret_from_interrupt
+
+ /*
+ * Process an external hardware interrupt.
+ */
+
+ addi ea, ea, -4 /* re-issue the interrupted instruction */
+ stw ea, PT_EA(sp)
+2: movi r4, %lo(-1) /* Start from bit position 0,
+ highest priority */
+ /* This is the IRQ # for handler call */
+1: andi r10, r12, 1 /* Isolate bit we are interested in */
+ srli r12, r12, 1 /* shift count is costly without hardware
+ multiplier */
+ addi r4, r4, 1
+ beq r10, r0, 1b
+ mov r5, sp /* Setup pt_regs pointer for handler call */
+ call do_IRQ
+ rdctl r12, ipending /* check again if irq still pending */
+ rdctl r9, ienable /* Isolate possible interrupts */
+ and r12, r12, r9
+ bne r12, r0, 2b
+ /* br ret_from_interrupt */ /* fall through to ret_from_interrupt */
+
+ENTRY(ret_from_interrupt)
+ ldw r1, PT_ESTATUS(sp) /* check if returning to kernel */
+ TSTBNZ r1, r1, ESTATUS_EU, Luser_return
+
+#ifdef CONFIG_PREEMPTION
+ GET_THREAD_INFO r1
+ ldw r4, TI_PREEMPT_COUNT(r1)
+ bne r4, r0, restore_all
+ ldw r4, TI_FLAGS(r1) /* ? Need resched set */
+ BTBZ r10, r4, TIF_NEED_RESCHED, restore_all
+ ldw r4, PT_ESTATUS(sp) /* ? Interrupts off */
+ andi r10, r4, ESTATUS_EPIE
+ beq r10, r0, restore_all
+ call preempt_schedule_irq
+#endif
+ br restore_all
+
+/***********************************************************************
+ * A few syscall wrappers
+ ***********************************************************************
+ */
+/*
+ * int clone(unsigned long clone_flags, unsigned long newsp,
+ * int __user * parent_tidptr, int __user * child_tidptr,
+ * int tls_val)
+ */
+ENTRY(sys_clone)
+ SAVE_SWITCH_STACK
+ subi sp, sp, 4 /* make space for tls pointer */
+ stw r8, 0(sp) /* pass tls pointer (r8) via stack (5th argument) */
+ call nios2_clone
+ addi sp, sp, 4
+ RESTORE_SWITCH_STACK
+ ret
+
+ENTRY(sys_rt_sigreturn)
+ SAVE_SWITCH_STACK
+ mov r4, sp
+ call do_rt_sigreturn
+ RESTORE_SWITCH_STACK
+ addi ra, ra, (end_translate_rc_and_ret - translate_rc_and_ret)
+ ret
+
+/***********************************************************************
+ * A few other wrappers and stubs
+ ***********************************************************************
+ */
+protection_exception_pte:
+ rdctl r6, pteaddr
+ slli r6, r6, 10
+ call do_page_fault
+ br ret_from_exception
+
+protection_exception_ba:
+ rdctl r6, badaddr
+ call do_page_fault
+ br ret_from_exception
+
+protection_exception_instr:
+ call handle_supervisor_instr
+ br ret_from_exception
+
+handle_breakpoint:
+ call breakpoint_c
+ br ret_from_exception
+
+#ifdef CONFIG_NIOS2_ALIGNMENT_TRAP
+handle_unaligned:
+ SAVE_SWITCH_STACK
+ call handle_unaligned_c
+ RESTORE_SWITCH_STACK
+ br ret_from_exception
+#else
+handle_unaligned:
+ call handle_unaligned_c
+ br ret_from_exception
+#endif
+
+handle_illegal:
+ call handle_illegal_c
+ br ret_from_exception
+
+handle_diverror:
+ call handle_diverror_c
+ br ret_from_exception
+
+#ifdef CONFIG_KGDB
+handle_kgdb_breakpoint:
+ call kgdb_breakpoint_c
+ br ret_from_exception
+#endif
+
+handle_trap_1:
+ call handle_trap_1_c
+ br ret_from_exception
+
+handle_trap_2:
+ call handle_trap_2_c
+ br ret_from_exception
+
+handle_trap_3:
+handle_trap_reserved:
+ call handle_trap_3_c
+ br ret_from_exception
+
+/*
+ * Beware - when entering resume, prev (the current task) is
+ * in r4, next (the new task) is in r5, don't change these
+ * registers.
+ */
+ENTRY(resume)
+
+ rdctl r7, status /* save thread status reg */
+ stw r7, TASK_THREAD + THREAD_KPSR(r4)
+
+ andi r7, r7, %lo(~STATUS_PIE) /* disable interrupts */
+ wrctl status, r7
+
+ SAVE_SWITCH_STACK
+ stw sp, TASK_THREAD + THREAD_KSP(r4)/* save kernel stack pointer */
+ ldw sp, TASK_THREAD + THREAD_KSP(r5)/* restore new thread stack */
+ movia r24, _current_thread /* save thread */
+ GET_THREAD_INFO r1
+ stw r1, 0(r24)
+ RESTORE_SWITCH_STACK
+
+ ldw r7, TASK_THREAD + THREAD_KPSR(r5)/* restore thread status reg */
+ wrctl status, r7
+ ret
+
+ENTRY(ret_from_fork)
+ call schedule_tail
+ br ret_from_exception
+
+ENTRY(ret_from_kernel_thread)
+ call schedule_tail
+ mov r4,r17 /* arg */
+ callr r16 /* function */
+ br ret_from_exception
+
+/*
+ * Kernel user helpers.
+ *
+ * Each segment is 64-byte aligned and will be mapped to the <User space>.
+ * New segments (if ever needed) must be added after the existing ones.
+ * This mechanism should be used only for things that are really small and
+ * justified, and not be abused freely.
+ *
+ */
+
+ /* Filling pads with undefined instructions. */
+.macro kuser_pad sym size
+ .if ((. - \sym) & 3)
+ .rept (4 - (. - \sym) & 3)
+ .byte 0
+ .endr
+ .endif
+ .rept ((\size - (. - \sym)) / 4)
+ .word 0xdeadbeef
+ .endr
+.endm
+
+ .align 6
+ .globl __kuser_helper_start
+__kuser_helper_start:
+
+__kuser_helper_version: /* @ 0x1000 */
+ .word ((__kuser_helper_end - __kuser_helper_start) >> 6)
+
+__kuser_cmpxchg: /* @ 0x1004 */
+ /*
+ * r4 pointer to exchange variable
+ * r5 old value
+ * r6 new value
+ */
+cmpxchg_ldw:
+ ldw r2, 0(r4) /* load current value */
+ sub r2, r2, r5 /* compare with old value */
+ bne r2, zero, cmpxchg_ret
+
+ /* We had a match, store the new value */
+cmpxchg_stw:
+ stw r6, 0(r4)
+cmpxchg_ret:
+ ret
+
+ kuser_pad __kuser_cmpxchg, 64
+
+ .globl __kuser_sigtramp
+__kuser_sigtramp:
+ movi r2, __NR_rt_sigreturn
+ trap
+
+ kuser_pad __kuser_sigtramp, 64
+
+ .globl __kuser_helper_end
+__kuser_helper_end: