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/*
* Low level exception handling
*
* 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.
*
* Copyright (C) 1994, 1995 by Ralf Baechle
*
* $Id: entry.S,v 1.17 1999/12/04 03:58:59 ralf Exp $
*/
/*
* entry.S 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. The ISA dependent TLB
* code is in arch/mips/<ISA-level>/<cputype>.S
*/
#include <linux/config.h>
#include <linux/sys.h>
#include <asm/asm.h>
#include <asm/current.h>
#include <asm/errno.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/stackframe.h>
#include <asm/processor.h>
#include <asm/regdef.h>
#include <asm/fpregdef.h>
#include <asm/unistd.h>
#include <asm/isadep.h>
/*
* Heia ... The %lo, %hi and %HI stuff is too strong for the ELF assembler
* and the ABI to cope with ...
*/
.text
.align 4
.set push
.set reorder
EXPORT(ret_from_fork)
jal schedule_tail
move a0, v0 # prev
j ret_from_sys_call
nop
EXPORT(handle_bottom_half)
jal do_bottom_half
b 9f
reschedule: jal schedule
EXPORT(ret_from_sys_call)
EXPORT(ret_from_irq)
.type ret_from_irq,@function
lw t0,bh_mask
lw t1,bh_active # unused delay slot
and t0,t1
bnez t0,handle_bottom_half
9: lw t0,PT_STATUS(sp) # returning to kernel mode?
lw t2, TASK_NEED_RESCHED($28)
andi t1, t0, KU_USER
beqz t1, return # -> yes
bnez t2, reschedule
lw v0, TASK_SIGPENDING($28)
move a0, zero
beqz v0, return
move a1, sp
jal do_signal
EXPORT(return) .set noat
RESTORE_ALL_AND_RET
.set at
/*
* Common spurious interrupt handler.
*/
.text
.align 5
LEAF(spurious_interrupt)
/*
* Someone tried to fool us by sending an interrupt but we
* couldn't find a cause for it.
*/
lui t1,%hi(spurious_count)
.set reorder
lw t0,%lo(spurious_count)(t1)
.set noreorder
addiu t0,1
j ret_from_irq
sw t0,%lo(spurious_count)(t1)
END(spurious_interrupt)
/*
* Build a default exception handler for the exceptions that don't need
* special handlers. If you didn't know yet - I *like* playing games with
* the C preprocessor ...
*/
#define __BUILD_clear_none(exception)
#define __BUILD_clear_sti(exception) \
STI
#define __BUILD_clear_cli(exception) \
CLI
#define __BUILD_clear_fpe(exception) \
cfc1 a1,fcr31; \
li a2,~(0x3f<<12); \
and a2,a1; \
ctc1 a2,fcr31; \
STI
#define __BUILD_clear_ade(exception) \
.set reorder; \
MFC0 t0,CP0_BADVADDR; \
.set noreorder; \
REG_S t0,PT_BVADDR(sp); \
KMODE
#define __BUILD_silent(exception)
#define fmt "Got %s at %08lx.\n"
#define __BUILD_verbose(exception) \
la a1,8f; \
TEXT (#exception); \
REG_L a2,PT_EPC(sp); \
PRINT(fmt)
#define __BUILD_count(exception) \
.set reorder; \
lw t0,exception_count_##exception; \
.set noreorder; \
addiu t0, 1; \
sw t0,exception_count_##exception; \
.data; \
EXPORT(exception_count_##exception); \
.word 0; \
.previous;
#define BUILD_HANDLER(exception,handler,clear,verbose) \
.align 5; \
NESTED(handle_##exception, PT_SIZE, sp); \
.set noat; \
SAVE_ALL; \
__BUILD_clear_##clear(exception); \
.set at; \
__BUILD_##verbose(exception); \
jal do_##handler; \
move a0,sp; \
j ret_from_sys_call; \
nop; \
END(handle_##exception)
BUILD_HANDLER(adel,ade,ade,silent) /* #4 */
BUILD_HANDLER(ades,ade,ade,silent) /* #5 */
BUILD_HANDLER(ibe,ibe,cli,verbose) /* #6 */
BUILD_HANDLER(dbe,dbe,cli,silent) /* #7 */
BUILD_HANDLER(bp,bp,sti,silent) /* #9 */
BUILD_HANDLER(ri,ri,sti,silent) /* #10 */
BUILD_HANDLER(cpu,cpu,sti,silent) /* #11 */
BUILD_HANDLER(ov,ov,sti,silent) /* #12 */
BUILD_HANDLER(tr,tr,sti,silent) /* #13 */
BUILD_HANDLER(fpe,fpe,fpe,silent) /* #15 */
BUILD_HANDLER(watch,watch,sti,verbose) /* #23 */
BUILD_HANDLER(reserved,reserved,sti,verbose) /* others */
.set pop
/*
* Table of syscalls
*/
.data
.align PTRLOG
EXPORT(sys_call_table)
#define SYS(call, narg) PTR call
/* Reserved space for all SVR4 syscalls. */
.space (1000)*PTRSIZE
#ifdef CONFIG_BINFMT_IRIX
/* 32bit IRIX5 system calls. */
#include "irix5sys.h"
#else
.space (1000)*PTRSIZE /* No IRIX syscalls */
#endif
/* Reserved space for all the BSD43 and POSIX syscalls. */
.space (2000)*PTRSIZE
/* Linux flavoured syscalls. */
#include "syscalls.h"
/*
* Number of arguments of each syscall
*/
EXPORT(sys_narg_table)
#undef SYS
#define SYS(call, narg) .byte narg
/* Reserved space for all SVR4 flavoured syscalls. */
.space (1000)
#ifdef CONFIG_BINFMT_IRIX
/* 32bit IRIX5 system calls. */
#include "irix5sys.h"
#else
.space (1000) /* No IRIX syscalls */
#endif
/* Reserved space for all the BSD43 and POSIX syscalls. */
.space (2000)
/* Linux flavoured syscalls. */
#include "syscalls.h"
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