+++ /dev/null
-/*
- * linux/arch/m68knommu/platform/5307/entry.S
- *
- * Copyright (C) 1999-2007, 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) 2004-2006 Macq Electronique SA. (www.macqel.com)
- *
- * Based on:
- *
- * linux/arch/m68k/kernel/entry.S
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file README.legal 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>
- * Bug, speed and maintainability fixes by Philippe De Muyter <phdm@macqel.be>
- */
-
-#include <linux/sys.h>
-#include <linux/linkage.h>
-#include <asm/unistd.h>
-#include <asm/thread_info.h>
-#include <asm/errno.h>
-#include <asm/setup.h>
-#include <asm/segment.h>
-#include <asm/asm-offsets.h>
-#include <asm/entry.h>
-
-#ifdef CONFIG_COLDFIRE_SW_A7
-/*
- * Define software copies of the supervisor and user stack pointers.
- */
-.bss
-sw_ksp:
-.long 0
-sw_usp:
-.long 0
-#endif /* CONFIG_COLDFIRE_SW_A7 */
-
-.text
-
-.globl system_call
-.globl resume
-.globl ret_from_exception
-.globl ret_from_signal
-.globl sys_call_table
-.globl inthandler
-.globl fasthandler
-
-enosys:
- mov.l #sys_ni_syscall,%d3
- bra 1f
-
-ENTRY(system_call)
- SAVE_ALL
- move #0x2000,%sr /* enable intrs again */
-
- cmpl #NR_syscalls,%d0
- jcc enosys
- lea sys_call_table,%a0
- lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */
- movel %a0@(%d0),%d3
- jeq enosys
-
-1:
- movel %sp,%d2 /* get thread_info pointer */
- andl #-THREAD_SIZE,%d2 /* at start of kernel stack */
- movel %d2,%a0
- movel %a0@,%a1 /* save top of frame */
- movel %sp,%a1@(TASK_THREAD+THREAD_ESP0)
- btst #(TIF_SYSCALL_TRACE%8),%a0@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
- bnes 1f
-
- movel %d3,%a0
- jbsr %a0@
- movel %d0,%sp@(PT_OFF_D0) /* save the return value */
- jra ret_from_exception
-1:
- movel #-ENOSYS,%d2 /* strace needs -ENOSYS in PT_OFF_D0 */
- movel %d2,PT_OFF_D0(%sp) /* on syscall entry */
- subql #4,%sp
- SAVE_SWITCH_STACK
- jbsr syscall_trace_enter
- RESTORE_SWITCH_STACK
- addql #4,%sp
- movel %d3,%a0
- jbsr %a0@
- movel %d0,%sp@(PT_OFF_D0) /* save the return value */
- subql #4,%sp /* dummy return address */
- SAVE_SWITCH_STACK
- jbsr syscall_trace_leave
-
-ret_from_signal:
- RESTORE_SWITCH_STACK
- addql #4,%sp
-
-ret_from_exception:
- move #0x2700,%sr /* disable intrs */
- btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel */
- jeq Luser_return /* if so, skip resched, signals */
-
-#ifdef CONFIG_PREEMPT
- movel %sp,%d1 /* get thread_info pointer */
- andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
- movel %d1,%a0
- movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
- andl #(1<<TIF_NEED_RESCHED),%d1
- jeq Lkernel_return
-
- movel %a0@(TI_PREEMPTCOUNT),%d1
- cmpl #0,%d1
- jne Lkernel_return
-
- pea Lkernel_return
- jmp preempt_schedule_irq /* preempt the kernel */
-#endif
-
-Lkernel_return:
- moveml %sp@,%d1-%d5/%a0-%a2
- lea %sp@(32),%sp /* space for 8 regs */
- movel %sp@+,%d0
- addql #4,%sp /* orig d0 */
- addl %sp@+,%sp /* stk adj */
- rte
-
-Luser_return:
- movel %sp,%d1 /* get thread_info pointer */
- andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
- movel %d1,%a0
- movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
- jne Lwork_to_do /* still work to do */
-
-Lreturn:
- RESTORE_USER
-
-Lwork_to_do:
- movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
- move #0x2000,%sr /* enable intrs again */
- btst #TIF_NEED_RESCHED,%d1
- jne reschedule
-
- /* GERG: do we need something here for TRACEing?? */
-
-Lsignal_return:
- subql #4,%sp /* dummy return address */
- SAVE_SWITCH_STACK
- pea %sp@(SWITCH_STACK_SIZE)
- jsr do_signal
- addql #4,%sp
- RESTORE_SWITCH_STACK
- addql #4,%sp
- jmp Luser_return
-
-/*
- * This is the generic interrupt handler (for all hardware interrupt
- * sources). Calls upto high level code to do all the work.
- */
-ENTRY(inthandler)
- SAVE_ALL
- moveq #-1,%d0
- movel %d0,%sp@(PT_OFF_ORIG_D0)
-
- movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */
- andl #0x03fc,%d0 /* mask out vector only */
-
- movel %sp,%sp@- /* push regs arg */
- lsrl #2,%d0 /* calculate real vector # */
- movel %d0,%sp@- /* push vector number */
- jbsr do_IRQ /* call high level irq handler */
- lea %sp@(8),%sp /* pop args off stack */
-
- bra ret_from_exception
-
-/*
- * Beware - when entering resume, prev (the current task) is
- * in a0, next (the new task) is in a1,so don't change these
- * registers until their contents are no longer needed.
- * This is always called in supervisor mode, so don't bother to save
- * and restore sr; user's process sr is actually in the stack.
- */
-ENTRY(resume)
- movel %a0, %d1 /* get prev thread in d1 */
- RDUSP
- movel %a2,%a0@(TASK_THREAD+THREAD_USP)
-
- SAVE_SWITCH_STACK
- movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */
- movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */
- RESTORE_SWITCH_STACK
-
- movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore thread user stack */
- WRUSP
- rts
git.openpandora.org / pandora-kernel.git / blobdiff