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/* $OpenBSD: locore.S,v 1.18 1998/09/15 10:58:53 pefo Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Digital Equipment Corporation and Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (C) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/loMem.s,
* v 1.1 89/07/11 17:55:04 nelson Exp SPRITE (DECWRL)
* from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsm.s,
* v 9.2 90/01/29 18:00:39 shirriff Exp SPRITE (DECWRL)
* from: Header: /sprite/src/kernel/vm/ds3100.md/vmPmaxAsm.s,
* v 1.1 89/07/10 14:27:41 nelson Exp SPRITE (DECWRL)
*
* from: @(#)locore.s 8.5 (Berkeley) 1/4/94
* JNPR: support.S,v 1.5.2.2 2007/08/29 10:03:49 girish
* $FreeBSD: release/9.1.0/sys/mips/mips/support.S 210626 2010-07-29 19:47:15Z jchandra $
*/
/*
* Copyright (c) 1997 Jonathan Stone (hereinafter referred to as the author)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Jonathan R. Stone for
* the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Contains code that is the first executed at boot time plus
* assembly language support routines.
*/
#include "opt_cputype.h"
#include "opt_ddb.h"
#include <sys/errno.h>
#include <machine/asm.h>
#include <machine/cpu.h>
#include <machine/regnum.h>
#include <machine/cpuregs.h>
#include "assym.s"
.set noreorder # Noreorder is default style!
/*
* Primitives
*/
.text
/*
* See if access to addr with a len type instruction causes a machine check.
* len is length of access (1=byte, 2=short, 4=int)
*
* badaddr(addr, len)
* char *addr;
* int len;
*/
LEAF(badaddr)
PTR_LA v0, baderr
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
bne a1, 1, 2f
PTR_S v0, U_PCB_ONFAULT(v1)
b 5f
lbu v0, (a0)
2:
bne a1, 2, 4f
nop
b 5f
lhu v0, (a0)
4:
lw v0, (a0)
5:
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
move v0, zero # made it w/o errors
baderr:
j ra
li v0, 1 # trap sends us here
END(badaddr)
/*
* int copystr(void *kfaddr, void *kdaddr, size_t maxlen, size_t *lencopied)
* Copy a NIL-terminated string, at most maxlen characters long. Return the
* number of characters copied (including the NIL) in *lencopied. If the
* string is too long, return ENAMETOOLONG; else return 0.
*/
LEAF(copystr)
move t0, a2
beq a2, zero, 4f
1:
lbu v0, 0(a0)
PTR_SUBU a2, a2, 1
beq v0, zero, 2f
sb v0, 0(a1) # each byte until NIL
PTR_ADDU a0, a0, 1
bne a2, zero, 1b # less than maxlen
PTR_ADDU a1, a1, 1
4:
li v0, ENAMETOOLONG # run out of space
2:
beq a3, zero, 3f # return num. of copied bytes
PTR_SUBU a2, t0, a2 # if the 4th arg was non-NULL
PTR_S a2, 0(a3)
3:
j ra # v0 is 0 or ENAMETOOLONG
nop
END(copystr)
/*
* fillw(pat, addr, count)
*/
LEAF(fillw)
1:
PTR_ADDU a2, a2, -1
sh a0, 0(a1)
bne a2,zero, 1b
PTR_ADDU a1, a1, 2
jr ra
nop
END(fillw)
/*
* Optimized memory zero code.
* mem_zero_page(addr);
*/
LEAF(mem_zero_page)
li v0, PAGE_SIZE
1:
PTR_SUBU v0, 8
sd zero, 0(a0)
bne zero, v0, 1b
PTR_ADDU a0, 8
jr ra
nop
END(mem_zero_page)
/*
* Block I/O routines mainly used by I/O drivers.
*
* Args as: a0 = port
* a1 = memory address
* a2 = count
*/
LEAF(insb)
beq a2, zero, 2f
PTR_ADDU a2, a1
1:
lbu v0, 0(a0)
PTR_ADDU a1, 1
bne a1, a2, 1b
sb v0, -1(a1)
2:
jr ra
nop
END(insb)
LEAF(insw)
beq a2, zero, 2f
PTR_ADDU a2, a2
PTR_ADDU a2, a1
1:
lhu v0, 0(a0)
PTR_ADDU a1, 2
bne a1, a2, 1b
sh v0, -2(a1)
2:
jr ra
nop
END(insw)
LEAF(insl)
beq a2, zero, 2f
sll a2, 2
PTR_ADDU a2, a1
1:
lw v0, 0(a0)
PTR_ADDU a1, 4
bne a1, a2, 1b
sw v0, -4(a1)
2:
jr ra
nop
END(insl)
LEAF(outsb)
beq a2, zero, 2f
PTR_ADDU a2, a1
1:
lbu v0, 0(a1)
PTR_ADDU a1, 1
bne a1, a2, 1b
sb v0, 0(a0)
2:
jr ra
nop
END(outsb)
LEAF(outsw)
beq a2, zero, 2f
addu a2, a2
li v0, 1
and v0, a1
bne v0, zero, 3f # arghh, unaligned.
addu a2, a1
1:
lhu v0, 0(a1)
addiu a1, 2
bne a1, a2, 1b
sh v0, 0(a0)
2:
jr ra
nop
3:
LWHI v0, 0(a1)
LWLO v0, 3(a1)
addiu a1, 2
bne a1, a2, 3b
sh v0, 0(a0)
jr ra
nop
END(outsw)
LEAF(outsl)
beq a2, zero, 2f
sll a2, 2
li v0, 3
and v0, a1
bne v0, zero, 3f # arghh, unaligned.
addu a2, a1
1:
lw v0, 0(a1)
addiu a1, 4
bne a1, a2, 1b
sw v0, 0(a0)
2:
jr ra
nop
3:
LWHI v0, 0(a1)
LWLO v0, 3(a1)
addiu a1, 4
bne a1, a2, 3b
sw v0, 0(a0)
jr ra
nop
END(outsl)
/*
* Copy a null terminated string from the user address space into
* the kernel address space.
*
* copyinstr(fromaddr, toaddr, maxlength, &lencopied)
* caddr_t fromaddr;
* caddr_t toaddr;
* u_int maxlength;
* u_int *lencopied;
*/
NON_LEAF(copyinstr, CALLFRAME_SIZ, ra)
PTR_SUBU sp, sp, CALLFRAME_SIZ
.mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
PTR_LA v0, copyerr
blt a0, zero, _C_LABEL(copyerr) # make sure address is in user space
REG_S ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
jal _C_LABEL(copystr)
PTR_S v0, U_PCB_ONFAULT(v1)
REG_L ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
PTR_ADDU sp, sp, CALLFRAME_SIZ
END(copyinstr)
/*
* Copy a null terminated string from the kernel address space into
* the user address space.
*
* copyoutstr(fromaddr, toaddr, maxlength, &lencopied)
* caddr_t fromaddr;
* caddr_t toaddr;
* u_int maxlength;
* u_int *lencopied;
*/
NON_LEAF(copyoutstr, CALLFRAME_SIZ, ra)
PTR_SUBU sp, sp, CALLFRAME_SIZ
.mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
PTR_LA v0, copyerr
blt a1, zero, _C_LABEL(copyerr) # make sure address is in user space
REG_S ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
jal _C_LABEL(copystr)
PTR_S v0, U_PCB_ONFAULT(v1)
REG_L ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
PTR_ADDU sp, sp, CALLFRAME_SIZ
END(copyoutstr)
/*
* Copy specified amount of data from user space into the kernel
* copyin(from, to, len)
* caddr_t *from; (user source address)
* caddr_t *to; (kernel destination address)
* unsigned len;
*/
NON_LEAF(copyin, CALLFRAME_SIZ, ra)
PTR_SUBU sp, sp, CALLFRAME_SIZ
.mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
PTR_LA v0, copyerr
blt a0, zero, _C_LABEL(copyerr) # make sure address is in user space
REG_S ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
jal _C_LABEL(bcopy)
PTR_S v0, U_PCB_ONFAULT(v1)
REG_L ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1) # bcopy modified v1, so reload
PTR_S zero, U_PCB_ONFAULT(v1)
PTR_ADDU sp, sp, CALLFRAME_SIZ
j ra
move v0, zero
END(copyin)
/*
* Copy specified amount of data from kernel to the user space
* copyout(from, to, len)
* caddr_t *from; (kernel source address)
* caddr_t *to; (user destination address)
* unsigned len;
*/
NON_LEAF(copyout, CALLFRAME_SIZ, ra)
PTR_SUBU sp, sp, CALLFRAME_SIZ
.mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
PTR_LA v0, copyerr
blt a1, zero, _C_LABEL(copyerr) # make sure address is in user space
REG_S ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
jal _C_LABEL(bcopy)
PTR_S v0, U_PCB_ONFAULT(v1)
REG_L ra, CALLFRAME_RA(sp)
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1) # bcopy modified v1, so reload
PTR_S zero, U_PCB_ONFAULT(v1)
PTR_ADDU sp, sp, CALLFRAME_SIZ
j ra
move v0, zero
END(copyout)
LEAF(copyerr)
REG_L ra, CALLFRAME_RA(sp)
PTR_ADDU sp, sp, CALLFRAME_SIZ
j ra
li v0, EFAULT # return error
END(copyerr)
/*
* {fu,su},{ibyte,isword,iword}, fetch or store a byte, short or word to
* user text space.
* {fu,su},{byte,sword,word}, fetch or store a byte, short or word to
* user data space.
*/
#ifdef __mips_n64
LEAF(fuword64)
ALEAF(fuword)
ALEAF(fuiword)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
ld v0, 0(a0) # fetch word
j ra
PTR_S zero, U_PCB_ONFAULT(v1)
END(fuword64)
#endif
LEAF(fuword32)
#ifndef __mips_n64
ALEAF(fuword)
ALEAF(fuiword)
#endif
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
lw v0, 0(a0) # fetch word
j ra
PTR_S zero, U_PCB_ONFAULT(v1)
END(fuword32)
LEAF(fusword)
ALEAF(fuisword)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
lhu v0, 0(a0) # fetch short
j ra
PTR_S zero, U_PCB_ONFAULT(v1)
END(fusword)
LEAF(fubyte)
ALEAF(fuibyte)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
lbu v0, 0(a0) # fetch byte
j ra
PTR_S zero, U_PCB_ONFAULT(v1)
END(fubyte)
LEAF(suword32)
#ifndef __mips_n64
XLEAF(suword)
#endif
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
sw a1, 0(a0) # store word
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
move v0, zero
END(suword32)
#ifdef __mips_n64
LEAF(suword64)
XLEAF(suword)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
sd a1, 0(a0) # store word
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
move v0, zero
END(suword64)
#endif
/*
* casuword(9)
* <v0>u_long casuword(<a0>u_long *p, <a1>u_long oldval, <a2>u_long newval)
*/
/*
* casuword32(9)
* <v0>uint32_t casuword(<a0>uint32_t *p, <a1>uint32_t oldval,
* <a2>uint32_t newval)
*/
LEAF(casuword32)
#ifndef __mips_n64
XLEAF(casuword)
#endif
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
1:
move t0, a2
ll v0, 0(a0)
bne a1, v0, 2f
nop
sc t0, 0(a0) # store word
beqz t0, 1b
nop
j 3f
nop
2:
li v0, -1
3:
PTR_S zero, U_PCB_ONFAULT(v1)
jr ra
nop
END(casuword32)
#ifdef __mips_n64
LEAF(casuword64)
XLEAF(casuword)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
1:
move t0, a2
lld v0, 0(a0)
bne a1, v0, 2f
nop
scd t0, 0(a0) # store double word
beqz t0, 1b
nop
j 3f
nop
2:
li v0, -1
3:
PTR_S zero, U_PCB_ONFAULT(v1)
jr ra
nop
END(casuword64)
#endif
#if 0
/* unused in FreeBSD */
/*
* Have to flush instruction cache afterwards.
*/
LEAF(suiword)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
sw a1, 0(a0) # store word
PTR_S zero, U_PCB_ONFAULT(v1)
j _C_LABEL(Mips_SyncICache) # FlushICache sets v0 = 0. (Ugly)
li a1, 4 # size of word
END(suiword)
#endif
/*
* Will have to flush the instruction cache if byte merging is done in hardware.
*/
LEAF(susword)
ALEAF(suisword)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
sh a1, 0(a0) # store short
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
move v0, zero
END(susword)
LEAF(subyte)
ALEAF(suibyte)
PTR_LA v0, fswberr
blt a0, zero, fswberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
sb a1, 0(a0) # store byte
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
move v0, zero
END(subyte)
LEAF(fswberr)
j ra
li v0, -1
END(fswberr)
/*
* fuswintr and suswintr are just like fusword and susword except that if
* the page is not in memory or would cause a trap, then we return an error.
* The important thing is to prevent sleep() and switch().
*/
LEAF(fuswintr)
PTR_LA v0, fswintrberr
blt a0, zero, fswintrberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
lhu v0, 0(a0) # fetch short
j ra
PTR_S zero, U_PCB_ONFAULT(v1)
END(fuswintr)
LEAF(suswintr)
PTR_LA v0, fswintrberr
blt a0, zero, fswintrberr # make sure address is in user space
nop
GET_CPU_PCPU(v1)
PTR_L v1, PC_CURPCB(v1)
PTR_S v0, U_PCB_ONFAULT(v1)
sh a1, 0(a0) # store short
PTR_S zero, U_PCB_ONFAULT(v1)
j ra
move v0, zero
END(suswintr)
LEAF(fswintrberr)
j ra
li v0, -1
END(fswintrberr)
/*
* memcpy(to, from, len)
* {ov}bcopy(from, to, len)
*/
LEAF(memcpy)
.set noreorder
move v0, a0 # swap from and to
move a0, a1
move a1, v0
ALEAF(bcopy)
ALEAF(ovbcopy)
.set noreorder
PTR_ADDU t0, a0, a2 # t0 = end of s1 region
sltu t1, a1, t0
sltu t2, a0, a1
and t1, t1, t2 # t1 = true if from < to < (from+len)
beq t1, zero, forward # non overlapping, do forward copy
slt t2, a2, 12 # check for small copy
ble a2, zero, 2f
PTR_ADDU t1, a1, a2 # t1 = end of to region
1:
lb v1, -1(t0) # copy bytes backwards,
PTR_SUBU t0, t0, 1 # doesnt happen often so do slow way
PTR_SUBU t1, t1, 1
bne t0, a0, 1b
sb v1, 0(t1)
2:
j ra
nop
forward:
bne t2, zero, smallcpy # do a small bcopy
xor v1, a0, a1 # compare low two bits of addresses
and v1, v1, 3
PTR_SUBU a3, zero, a1 # compute # bytes to word align address
beq v1, zero, aligned # addresses can be word aligned
and a3, a3, 3
beq a3, zero, 1f
PTR_SUBU a2, a2, a3 # subtract from remaining count
LWHI v1, 0(a0) # get next 4 bytes (unaligned)
LWLO v1, 3(a0)
PTR_ADDU a0, a0, a3
SWHI v1, 0(a1) # store 1, 2, or 3 bytes to align a1
PTR_ADDU a1, a1, a3
1:
and v1, a2, 3 # compute number of words left
PTR_SUBU a3, a2, v1
move a2, v1
PTR_ADDU a3, a3, a0 # compute ending address
2:
LWHI v1, 0(a0) # copy words a0 unaligned, a1 aligned
LWLO v1, 3(a0)
PTR_ADDU a0, a0, 4
sw v1, 0(a1)
PTR_ADDU a1, a1, 4
bne a0, a3, 2b
nop # We have to do this mmu-bug.
b smallcpy
nop
aligned:
beq a3, zero, 1f
PTR_SUBU a2, a2, a3 # subtract from remaining count
LWHI v1, 0(a0) # copy 1, 2, or 3 bytes to align
PTR_ADDU a0, a0, a3
SWHI v1, 0(a1)
PTR_ADDU a1, a1, a3
1:
and v1, a2, 3 # compute number of whole words left
PTR_SUBU a3, a2, v1
move a2, v1
PTR_ADDU a3, a3, a0 # compute ending address
2:
lw v1, 0(a0) # copy words
PTR_ADDU a0, a0, 4
sw v1, 0(a1)
bne a0, a3, 2b
PTR_ADDU a1, a1, 4
smallcpy:
ble a2, zero, 2f
PTR_ADDU a3, a2, a0 # compute ending address
1:
lbu v1, 0(a0) # copy bytes
PTR_ADDU a0, a0, 1
sb v1, 0(a1)
bne a0, a3, 1b
PTR_ADDU a1, a1, 1 # MMU BUG ? can not do -1(a1) at 0x80000000!!
2:
j ra
nop
END(memcpy)
/*
* memset(void *s1, int c, int len)
* NetBSD: memset.S,v 1.3 2001/10/16 15:40:53 uch Exp
*/
LEAF(memset)
.set noreorder
blt a2, 12, memsetsmallclr # small amount to clear?
move v0, a0 # save s1 for result
sll t1, a1, 8 # compute c << 8 in t1
or t1, t1, a1 # compute c << 8 | c in 11
sll t2, t1, 16 # shift that left 16
or t1, t2, t1 # or together
PTR_SUBU t0, zero, a0 # compute # bytes to word align address
and t0, t0, 3
beq t0, zero, 1f # skip if word aligned
PTR_SUBU a2, a2, t0 # subtract from remaining count
SWHI t1, 0(a0) # store 1, 2, or 3 bytes to align
PTR_ADDU a0, a0, t0
1:
and v1, a2, 3 # compute number of whole words left
PTR_SUBU t0, a2, v1
PTR_SUBU a2, a2, t0
PTR_ADDU t0, t0, a0 # compute ending address
2:
PTR_ADDU a0, a0, 4 # clear words
#ifdef MIPS3_5900
nop
nop
nop
nop
#endif
bne a0, t0, 2b # unrolling loop does not help
sw t1, -4(a0) # since we are limited by memory speed
memsetsmallclr:
ble a2, zero, 2f
PTR_ADDU t0, a2, a0 # compute ending address
1:
PTR_ADDU a0, a0, 1 # clear bytes
#ifdef MIPS3_5900
nop
nop
nop
nop
#endif
bne a0, t0, 1b
sb a1, -1(a0)
2:
j ra
nop
.set reorder
END(memset)
/*
* bzero(s1, n)
*/
LEAF(bzero)
ALEAF(blkclr)
.set noreorder
blt a1, 12, smallclr # small amount to clear?
PTR_SUBU a3, zero, a0 # compute # bytes to word align address
and a3, a3, 3
beq a3, zero, 1f # skip if word aligned
PTR_SUBU a1, a1, a3 # subtract from remaining count
SWHI zero, 0(a0) # clear 1, 2, or 3 bytes to align
PTR_ADDU a0, a0, a3
1:
and v0, a1, 3 # compute number of words left
PTR_SUBU a3, a1, v0
move a1, v0
PTR_ADDU a3, a3, a0 # compute ending address
2:
PTR_ADDU a0, a0, 4 # clear words
bne a0, a3, 2b # unrolling loop does not help
sw zero, -4(a0) # since we are limited by memory speed
smallclr:
ble a1, zero, 2f
PTR_ADDU a3, a1, a0 # compute ending address
1:
PTR_ADDU a0, a0, 1 # clear bytes
bne a0, a3, 1b
sb zero, -1(a0)
2:
j ra
nop
END(bzero)
/*
* bcmp(s1, s2, n)
*/
LEAF(bcmp)
.set noreorder
blt a2, 16, smallcmp # is it worth any trouble?
xor v0, a0, a1 # compare low two bits of addresses
and v0, v0, 3
PTR_SUBU a3, zero, a1 # compute # bytes to word align address
bne v0, zero, unalignedcmp # not possible to align addresses
and a3, a3, 3
beq a3, zero, 1f
PTR_SUBU a2, a2, a3 # subtract from remaining count
move v0, v1 # init v0,v1 so unmodified bytes match
LWHI v0, 0(a0) # read 1, 2, or 3 bytes
LWHI v1, 0(a1)
PTR_ADDU a1, a1, a3
bne v0, v1, nomatch
PTR_ADDU a0, a0, a3
1:
and a3, a2, ~3 # compute number of whole words left
PTR_SUBU a2, a2, a3 # which has to be >= (16-3) & ~3
PTR_ADDU a3, a3, a0 # compute ending address
2:
lw v0, 0(a0) # compare words
lw v1, 0(a1)
PTR_ADDU a0, a0, 4
bne v0, v1, nomatch
PTR_ADDU a1, a1, 4
bne a0, a3, 2b
nop
b smallcmp # finish remainder
nop
unalignedcmp:
beq a3, zero, 2f
PTR_SUBU a2, a2, a3 # subtract from remaining count
PTR_ADDU a3, a3, a0 # compute ending address
1:
lbu v0, 0(a0) # compare bytes until a1 word aligned
lbu v1, 0(a1)
PTR_ADDU a0, a0, 1
bne v0, v1, nomatch
PTR_ADDU a1, a1, 1
bne a0, a3, 1b
nop
2:
and a3, a2, ~3 # compute number of whole words left
PTR_SUBU a2, a2, a3 # which has to be >= (16-3) & ~3
PTR_ADDU a3, a3, a0 # compute ending address
3:
LWHI v0, 0(a0) # compare words a0 unaligned, a1 aligned
LWLO v0, 3(a0)
lw v1, 0(a1)
PTR_ADDU a0, a0, 4
bne v0, v1, nomatch
PTR_ADDU a1, a1, 4
bne a0, a3, 3b
nop
smallcmp:
ble a2, zero, match
PTR_ADDU a3, a2, a0 # compute ending address
1:
lbu v0, 0(a0)
lbu v1, 0(a1)
PTR_ADDU a0, a0, 1
bne v0, v1, nomatch
PTR_ADDU a1, a1, 1
bne a0, a3, 1b
nop
match:
j ra
move v0, zero
nomatch:
j ra
li v0, 1
END(bcmp)
/*
* bit = ffs(value)
*/
LEAF(ffs)
.set noreorder
beq a0, zero, 2f
move v0, zero
1:
and v1, a0, 1 # bit set?
addu v0, v0, 1
beq v1, zero, 1b # no, continue
srl a0, a0, 1
2:
j ra
nop
END(ffs)
LEAF(get_current_fp)
j ra
move v0, s8
END(get_current_fp)
LEAF(loadandclear)
.set noreorder
1:
ll v0, 0(a0)
move t0, zero
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(loadandclear)
#if 0
/*
* u_int32_t atomic_cmpset_32(u_int32_t *p, u_int32_t cmpval, u_int32_t newval)
* Atomically compare the value stored at p with cmpval
* and if the two values are equal, update value *p with
* newval. Return zero if compare failed, non-zero otherwise
*
*/
LEAF(atomic_cmpset_32)
.set noreorder
1:
ll t0, 0(a0)
move v0, zero
bne t0, a1, 2f
move t1, a2
sc t1, 0(a0)
beq t1, zero, 1b
or v0, v0, 1
2:
j ra
nop
END(atomic_cmpset_32)
/**
* u_int32_t
* atomic_readandclear_32(u_int32_t *a)
* {
* u_int32_t retval;
* retval = *a;
* *a = 0;
* }
*/
LEAF(atomic_readandclear_32)
.set noreorder
1:
ll t0, 0(a0)
move t1, zero
move v0, t0
sc t1, 0(a0)
beq t1, zero, 1b
nop
j ra
nop
END(atomic_readandclear_32)
/**
* void
* atomic_set_32(u_int32_t *a, u_int32_t b)
* {
* *a |= b;
* }
*/
LEAF(atomic_set_32)
.set noreorder
1:
ll t0, 0(a0)
or t0, t0, a1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_set_32)
/**
* void
* atomic_add_32(uint32_t *a, uint32_t b)
* {
* *a += b;
* }
*/
LEAF(atomic_add_32)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
1:
ll t0, 0(a0)
addu t0, t0, a1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_add_32)
/**
* void
* atomic_clear_32(u_int32_t *a, u_int32_t b)
* {
* *a &= ~b;
* }
*/
LEAF(atomic_clear_32)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
nor a1, zero, a1
1:
ll t0, 0(a0)
and t0, t0, a1 # t1 has the new lower 16 bits
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_clear_32)
/**
* void
* atomic_subtract_32(uint16_t *a, uint16_t b)
* {
* *a -= b;
* }
*/
LEAF(atomic_subtract_32)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
1:
ll t0, 0(a0)
subu t0, t0, a1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_subtract_32)
#endif
/**
* void
* atomic_set_16(u_int16_t *a, u_int16_t b)
* {
* *a |= b;
* }
*/
LEAF(atomic_set_16)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
andi a1, a1, 0xffff
1:
ll t0, 0(a0)
or t0, t0, a1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_set_16)
/**
* void
* atomic_clear_16(u_int16_t *a, u_int16_t b)
* {
* *a &= ~b;
* }
*/
LEAF(atomic_clear_16)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
nor a1, zero, a1
1:
ll t0, 0(a0)
move t1, t0
andi t1, t1, 0xffff # t1 has the original lower 16 bits
and t1, t1, a1 # t1 has the new lower 16 bits
srl t0, t0, 16 # preserve original top 16 bits
sll t0, t0, 16
or t0, t0, t1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_clear_16)
/**
* void
* atomic_subtract_16(uint16_t *a, uint16_t b)
* {
* *a -= b;
* }
*/
LEAF(atomic_subtract_16)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
1:
ll t0, 0(a0)
move t1, t0
andi t1, t1, 0xffff # t1 has the original lower 16 bits
subu t1, t1, a1
andi t1, t1, 0xffff # t1 has the new lower 16 bits
srl t0, t0, 16 # preserve original top 16 bits
sll t0, t0, 16
or t0, t0, t1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_subtract_16)
/**
* void
* atomic_add_16(uint16_t *a, uint16_t b)
* {
* *a += b;
* }
*/
LEAF(atomic_add_16)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
1:
ll t0, 0(a0)
move t1, t0
andi t1, t1, 0xffff # t1 has the original lower 16 bits
addu t1, t1, a1
andi t1, t1, 0xffff # t1 has the new lower 16 bits
srl t0, t0, 16 # preserve original top 16 bits
sll t0, t0, 16
or t0, t0, t1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_add_16)
/**
* void
* atomic_add_8(uint8_t *a, uint8_t b)
* {
* *a += b;
* }
*/
LEAF(atomic_add_8)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
1:
ll t0, 0(a0)
move t1, t0
andi t1, t1, 0xff # t1 has the original lower 8 bits
addu t1, t1, a1
andi t1, t1, 0xff # t1 has the new lower 8 bits
srl t0, t0, 8 # preserve original top 24 bits
sll t0, t0, 8
or t0, t0, t1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_add_8)
/**
* void
* atomic_subtract_8(uint8_t *a, uint8_t b)
* {
* *a += b;
* }
*/
LEAF(atomic_subtract_8)
.set noreorder
srl a0, a0, 2 # round down address to be 32-bit aligned
sll a0, a0, 2
1:
ll t0, 0(a0)
move t1, t0
andi t1, t1, 0xff # t1 has the original lower 8 bits
subu t1, t1, a1
andi t1, t1, 0xff # t1 has the new lower 8 bits
srl t0, t0, 8 # preserve original top 24 bits
sll t0, t0, 8
or t0, t0, t1
sc t0, 0(a0)
beq t0, zero, 1b
nop
j ra
nop
END(atomic_subtract_8)
/*
* atomic 64-bit register read/write assembly language support routines.
*/
.set noreorder # Noreorder is default style!
#if !defined(__mips_n64) && !defined(__mips_n32)
/*
* I don't know if these routines have the right number of
* NOPs in it for all processors. XXX
*
* Maybe it would be better to just leave this undefined in that case.
*/
LEAF(atomic_store_64)
mfc0 t1, MIPS_COP_0_STATUS
and t2, t1, ~MIPS_SR_INT_IE
mtc0 t2, MIPS_COP_0_STATUS
nop
nop
nop
nop
ld t0, (a1)
nop
nop
sd t0, (a0)
nop
nop
mtc0 t1,MIPS_COP_0_STATUS
nop
nop
nop
nop
j ra
nop
END(atomic_store_64)
LEAF(atomic_load_64)
mfc0 t1, MIPS_COP_0_STATUS
and t2, t1, ~MIPS_SR_INT_IE
mtc0 t2, MIPS_COP_0_STATUS
nop
nop
nop
nop
ld t0, (a0)
nop
nop
sd t0, (a1)
nop
nop
mtc0 t1,MIPS_COP_0_STATUS
nop
nop
nop
nop
j ra
nop
END(atomic_load_64)
#endif
#if defined(DDB) || defined(DEBUG)
LEAF(kdbpeek)
PTR_LA v1, ddberr
and v0, a0, 3 # unaligned ?
GET_CPU_PCPU(t1)
PTR_L t1, PC_CURPCB(t1)
bne v0, zero, 1f
PTR_S v1, U_PCB_ONFAULT(t1)
lw v0, (a0)
jr ra
PTR_S zero, U_PCB_ONFAULT(t1)
1:
LWHI v0, 0(a0)
LWLO v0, 3(a0)
jr ra
PTR_S zero, U_PCB_ONFAULT(t1)
END(kdbpeek)
ddberr:
jr ra
nop
#if defined(DDB)
LEAF(kdbpoke)
PTR_LA v1, ddberr
and v0, a0, 3 # unaligned ?
GET_CPU_PCPU(t1)
PTR_L t1, PC_CURPCB(t1)
bne v0, zero, 1f
PTR_S v1, U_PCB_ONFAULT(t1)
sw a1, (a0)
jr ra
PTR_S zero, U_PCB_ONFAULT(t1)
1:
SWHI a1, 0(a0)
SWLO a1, 3(a0)
jr ra
PTR_S zero, U_PCB_ONFAULT(t1)
END(kdbpoke)
.data
.globl esym
esym: .word 0
#endif /* DDB */
#endif /* DDB || DEBUG */
.text
LEAF(breakpoint)
break MIPS_BREAK_SOVER_VAL
jr ra
nop
END(breakpoint)
LEAF(setjmp)
mfc0 v0, MIPS_COP_0_STATUS # Later the "real" spl value!
REG_S s0, (SZREG * PREG_S0)(a0)
REG_S s1, (SZREG * PREG_S1)(a0)
REG_S s2, (SZREG * PREG_S2)(a0)
REG_S s3, (SZREG * PREG_S3)(a0)
REG_S s4, (SZREG * PREG_S4)(a0)
REG_S s5, (SZREG * PREG_S5)(a0)
REG_S s6, (SZREG * PREG_S6)(a0)
REG_S s7, (SZREG * PREG_S7)(a0)
REG_S s8, (SZREG * PREG_S8)(a0)
REG_S sp, (SZREG * PREG_SP)(a0)
REG_S ra, (SZREG * PREG_RA)(a0)
REG_S v0, (SZREG * PREG_SR)(a0)
jr ra
li v0, 0 # setjmp return
END(setjmp)
LEAF(longjmp)
REG_L v0, (SZREG * PREG_SR)(a0)
REG_L ra, (SZREG * PREG_RA)(a0)
REG_L s0, (SZREG * PREG_S0)(a0)
REG_L s1, (SZREG * PREG_S1)(a0)
REG_L s2, (SZREG * PREG_S2)(a0)
REG_L s3, (SZREG * PREG_S3)(a0)
REG_L s4, (SZREG * PREG_S4)(a0)
REG_L s5, (SZREG * PREG_S5)(a0)
REG_L s6, (SZREG * PREG_S6)(a0)
REG_L s7, (SZREG * PREG_S7)(a0)
REG_L s8, (SZREG * PREG_S8)(a0)
REG_L sp, (SZREG * PREG_SP)(a0)
mtc0 v0, MIPS_COP_0_STATUS # Later the "real" spl value!
ITLBNOPFIX
jr ra
li v0, 1 # longjmp return
END(longjmp)
LEAF(fusufault)
GET_CPU_PCPU(t0)
lw t0, PC_CURTHREAD(t0)
lw t0, TD_PCB(t0)
li v0, -1
j ra
END(fusufault)
/* Define a new md function 'casuptr'. This atomically compares and sets
a pointer that is in user space. It will be used as the basic primitive
for a kernel supported user space lock implementation. */
LEAF(casuptr)
PTR_LI t0, VM_MAXUSER_ADDRESS /* verify address validity */
blt a0, t0, fusufault /* trap faults */
nop
GET_CPU_PCPU(t1)
lw t1, PC_CURTHREAD(t1)
lw t1, TD_PCB(t1)
PTR_LA t2, fusufault
PTR_S t2, U_PCB_ONFAULT(t1)
1:
ll v0, 0(a0) /* try to load the old value */
beq v0, a1, 2f /* compare */
move t0, a2 /* setup value to write */
sc t0, 0(a0) /* write if address still locked */
beq t0, zero, 1b /* if it failed, spin */
2:
PTR_S zero, U_PCB_ONFAULT(t1) /* clean up */
j ra
END(casuptr)
#ifdef CPU_CNMIPS
/*
* void octeon_enable_shadow(void)
* turns on access to CC and CCRes
*/
LEAF(octeon_enable_shadow)
li t1, 0x0000000f
mtc0 t1, MIPS_COP_0_INFO
jr ra
nop
END(octeon_enable_shadow)
LEAF(octeon_get_shadow)
mfc0 v0, MIPS_COP_0_INFO
jr ra
nop
END(octeon_get_shadow)
/*
* octeon_set_control(addr, uint32_t val)
*/
LEAF(octeon_set_control)
.set push
or t1, a1, zero
/* dmfc0 a1, 9, 7*/
.word 0x40254807
sd a1, 0(a0)
or a1, t1, zero
/* dmtc0 a1, 9, 7*/
.word 0x40a54807
jr ra
nop
.set pop
END(octeon_set_control)
/*
* octeon_get_control(addr)
*/
LEAF(octeon_get_control)
.set push
.set mips64r2
/* dmfc0 a1, 9, 7 */
.word 0x40254807
sd a1, 0(a0)
jr ra
nop
.set pop
END(octeon_get_control)
#endif
LEAF(mips3_ld)
.set push
.set noreorder
.set mips64
#if defined(__mips_o32)
mfc0 t0, MIPS_COP_0_STATUS # turn off interrupts
and t1, t0, ~(MIPS_SR_INT_IE)
mtc0 t1, MIPS_COP_0_STATUS
COP0_SYNC
nop
nop
nop
ld v0, 0(a0)
#if _BYTE_ORDER == _BIG_ENDIAN
dsll v1, v0, 32
dsra v1, v1, 32 # low word in v1
dsra v0, v0, 32 # high word in v0
#else
dsra v1, v0, 32 # high word in v1
dsll v0, v0, 32
dsra v0, v0, 32 # low word in v0
#endif
mtc0 t0, MIPS_COP_0_STATUS # restore intr status.
COP0_SYNC
nop
#else /* !__mips_o32 */
ld v0, 0(a0)
#endif /* !__mips_o32 */
jr ra
nop
.set pop
END(mips3_ld)
LEAF(mips3_sd)
.set push
.set mips64
.set noreorder
#if defined(__mips_o32)
mfc0 t0, MIPS_COP_0_STATUS # turn off interrupts
and t1, t0, ~(MIPS_SR_INT_IE)
mtc0 t1, MIPS_COP_0_STATUS
COP0_SYNC
nop
nop
nop
# NOTE: a1 is padding!
#if _BYTE_ORDER == _BIG_ENDIAN
dsll a2, a2, 32 # high word in a2
dsll a3, a3, 32 # low word in a3
dsrl a3, a3, 32
#else
dsll a2, a2, 32 # low word in a2
dsrl a2, a2, 32
dsll a3, a3, 32 # high word in a3
#endif
or a1, a2, a3
sd a1, 0(a0)
mtc0 t0, MIPS_COP_0_STATUS # restore intr status.
COP0_SYNC
nop
#else /* !__mips_o32 */
sd a1, 0(a0)
#endif /* !__mips_o32 */
jr ra
nop
.set pop
END(mips3_sd)