/*
* 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 - 2000, 2001 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2001 MIPS Technologies, Inc.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/sys.h>
#include <asm/addrspace.h>
#include <asm/asm.h>
#include <asm/cacheops.h>
#include <asm/current.h>
#include <asm/errno.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/pgtable-bits.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>
.text
.align 5
.set push
.set reorder
FEXPORT(ret_from_irq)
FEXPORT(ret_from_exception)
lw t0, PT_STATUS(sp) # returning to kernel mode?
andi t0, t0, KU_USER
beqz t0, restore_all
FEXPORT(ret_from_sys_call) # here to prevent code duplication
ret_from_schedule:
mfc0 t0, CP0_STATUS # need_resched and signals atomic test
ori t0, t0, 1
xori t0, t0, 1
mtc0 t0, CP0_STATUS
SSNOP; SSNOP; SSNOP
lw v0, TASK_NEED_RESCHED($28)
lw v1, TASK_SIGPENDING($28)
bnez v0, reschedule
bnez v1, signal_return
restore_all: .set noat
RESTORE_ALL_AND_RET
.set at
/* Put this behind restore_all for the sake of the branch prediction. */
signal_return:
.type signal_return, @function
mfc0 t0, CP0_STATUS
ori t0, t0, 1
mtc0 t0, CP0_STATUS
move a0, zero
move a1, sp
jal do_signal
b restore_all
reschedule:
jal schedule
b ret_from_schedule
/*
* 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(irq_err_count)
lw t0,%lo(irq_err_count)(t1)
addiu t0,1
sw t0,%lo(irq_err_count)(t1)
j ret_from_irq
END(spurious_interrupt)
__INIT
.set reorder
NESTED(except_vec1_generic, 0, sp)
PANIC("Exception vector 1 called")
END(except_vec1_generic)
/*
* General exception vector. Used for all CPUs except R4000
* and R4400 SC and MC versions.
*/
NESTED(except_vec3_generic, 0, sp)
#if R5432_CP0_INTERRUPT_WAR
mfc0 k0, CP0_INDEX
#endif
mfc0 k1, CP0_CAUSE
la k0, exception_handlers
andi k1, k1, 0x7c
addu k0, k0, k1
lw k0, (k0)
jr k0
END(except_vec3_generic)
.set at
/* General exception vector R4000 version. */
NESTED(except_vec3_r4000, 0, sp)
.set push
.set mips3
.set noat
mfc0 k1, CP0_CAUSE
li k0, 31<<2
andi k1, k1, 0x7c
.set noreorder
beq k1, k0, handle_vced
li k0, 14<<2
beq k1, k0, handle_vcei
la k0, exception_handlers
.set reorder
addu k0, k0, k1
lw k0, (k0)
jr k0
/*
* Big shit, we now may have two dirty primary cache lines for
* the same physical address. We can savely invalidate the
* line pointed to by c0_badvaddr because after return from
* this exception handler the load / store will be re-executed.
*/
handle_vced:
mfc0 k0, CP0_BADVADDR
li k1, -4
and k0, k1
mtc0 zero, CP0_TAGLO
cache Index_Store_Tag_D,(k0)
cache Hit_Writeback_Inv_SD,(k0)
#ifdef CONFIG_PROC_FS
lui k0, %hi(vced_count)
lw k1, %lo(vced_count)(k0)
addiu k1, 1
sw k1, %lo(vced_count)(k0)
#endif
eret
handle_vcei:
mfc0 k0, CP0_BADVADDR
cache Hit_Writeback_Inv_SD, (k0) # also cleans pi
#ifdef CONFIG_PROC_FS
lui k0, %hi(vcei_count)
lw k1, %lo(vcei_count)(k0)
addiu k1, 1
sw k1, %lo(vcei_count)(k0)
#endif
eret
.set pop
END(except_vec3_r4000)
__FINIT
/*
* 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; \
FEXPORT(handle_##exception##_int); \
__BUILD_clear_##clear(exception); \
.set at; \
__BUILD_##verbose(exception); \
jal do_##handler; \
move a0, sp; \
j ret_from_exception; \
nop; \
END(handle_##exception)
BUILD_HANDLER(adel,ade,ade,silent) /* #4 */
BUILD_HANDLER(ades,ade,ade,silent) /* #5 */
BUILD_HANDLER(ibe,be,cli,silent) /* #6 */
BUILD_HANDLER(dbe,be,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(mdmx,mdmx,sti,silent) /* #22 */
BUILD_HANDLER(watch,watch,sti,silent) /* #23 */
BUILD_HANDLER(mcheck,mcheck,cli,silent) /* #24 */
BUILD_HANDLER(reserved,reserved,sti,silent) /* 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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