forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
199 lines
5.2 KiB
199 lines
5.2 KiB
/* |
|
* entry.S -- interrupt and exception processing for ColdFire |
|
* |
|
* 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/linkage.h> |
|
#include <asm/unistd.h> |
|
#include <asm/thread_info.h> |
|
#include <asm/errno.h> |
|
#include <asm/setup.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 sys_call_table |
|
.globl inthandler |
|
|
|
enosys: |
|
mov.l #sys_ni_syscall,%d3 |
|
bra 1f |
|
|
|
ENTRY(system_call) |
|
SAVE_ALL_SYS |
|
move #0x2000,%sr /* enable intrs again */ |
|
GET_CURRENT(%d2) |
|
|
|
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@(TINFO_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 |
|
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_PREEMPTION |
|
movel %sp,%d1 /* get thread_info pointer */ |
|
andl #-THREAD_SIZE,%d1 /* at base of kernel stack */ |
|
movel %d1,%a0 |
|
movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */ |
|
andl #(1<<TIF_NEED_RESCHED),%d1 |
|
jeq Lkernel_return |
|
|
|
movel %a0@(TINFO_PREEMPT),%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 |
|
moveb %a0@(TINFO_FLAGS+3),%d1 /* thread_info->flags (low 8 bits) */ |
|
jne Lwork_to_do /* still work to do */ |
|
|
|
Lreturn: |
|
RESTORE_USER |
|
|
|
Lwork_to_do: |
|
movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */ |
|
move #0x2000,%sr /* enable intrs again */ |
|
btst #TIF_NEED_RESCHED,%d1 |
|
jne reschedule |
|
|
|
Lsignal_return: |
|
subql #4,%sp /* dummy return address */ |
|
SAVE_SWITCH_STACK |
|
pea %sp@(SWITCH_STACK_SIZE) |
|
jsr do_notify_resume |
|
addql #4,%sp |
|
RESTORE_SWITCH_STACK |
|
addql #4,%sp |
|
jmp Luser_return |
|
|
|
/* |
|
* This is the generic interrupt handler (for all hardware interrupt |
|
* sources). Calls up to high level code to do all the work. |
|
*/ |
|
ENTRY(inthandler) |
|
SAVE_ALL_INT |
|
GET_CURRENT(%d2) |
|
|
|
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. |
|
*/ |
|
ENTRY(resume) |
|
movew %sr,%d1 /* save current status */ |
|
movew %d1,%a0@(TASK_THREAD+THREAD_SR) |
|
movel %a0,%d1 /* get prev thread in d1 */ |
|
SAVE_SWITCH_STACK |
|
movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */ |
|
RDUSP /* movel %usp,%a3 */ |
|
movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */ |
|
#ifdef CONFIG_MMU |
|
movel %a1,%a2 /* set new current */ |
|
#endif |
|
movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */ |
|
WRUSP /* movel %a3,%usp */ |
|
movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */ |
|
movew %a1@(TASK_THREAD+THREAD_SR),%d7 /* restore new status */ |
|
movew %d7,%sr |
|
RESTORE_SWITCH_STACK |
|
rts |
|
|
|
|