mirror of
https://github.com/torvalds/linux.git
synced 2024-12-02 00:51:44 +00:00
6710287280
Remove CONFIG_SET_FS from parisc, so we need to add __get_kernel_nofault() and __put_kernel_nofault(), define HAVE_GET_KERNEL_NOFAULT and remove set_fs(), get_fs(), load_sr2(), thread_info->addr_limit, KERNEL_DS and USER_DS. The nice side-effect of this patch is that we now can directly access userspace via sr3 without the need to use a temporary sr2 which is either copied from sr3 or set to zero (for kernel space). Signed-off-by: Helge Deller <deller@gmx.de> Suggested-by: Arnd Bergmann <arnd@kernel.org>
363 lines
8.8 KiB
ArmAsm
363 lines
8.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* User Space Access Routines
|
|
*
|
|
* Copyright (C) 2000-2002 Hewlett-Packard (John Marvin)
|
|
* Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org>
|
|
* Copyright (C) 2001 Matthieu Delahaye <delahaym at esiee.fr>
|
|
* Copyright (C) 2003 Randolph Chung <tausq with parisc-linux.org>
|
|
* Copyright (C) 2017 Helge Deller <deller@gmx.de>
|
|
* Copyright (C) 2017 John David Anglin <dave.anglin@bell.net>
|
|
*/
|
|
|
|
/*
|
|
* These routines still have plenty of room for optimization
|
|
* (word & doubleword load/store, dual issue, store hints, etc.).
|
|
*/
|
|
|
|
/*
|
|
* The following routines assume that space register 3 (sr3) contains
|
|
* the space id associated with the current users address space.
|
|
*/
|
|
|
|
|
|
.text
|
|
|
|
#include <asm/assembly.h>
|
|
#include <asm/errno.h>
|
|
#include <linux/linkage.h>
|
|
|
|
/*
|
|
* unsigned long lclear_user(void *to, unsigned long n)
|
|
*
|
|
* Returns 0 for success.
|
|
* otherwise, returns number of bytes not transferred.
|
|
*/
|
|
|
|
ENTRY_CFI(lclear_user)
|
|
comib,=,n 0,%r25,$lclu_done
|
|
$lclu_loop:
|
|
addib,<> -1,%r25,$lclu_loop
|
|
1: stbs,ma %r0,1(%sr3,%r26)
|
|
|
|
$lclu_done:
|
|
bv %r0(%r2)
|
|
copy %r25,%r28
|
|
|
|
2: b $lclu_done
|
|
ldo 1(%r25),%r25
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,2b)
|
|
ENDPROC_CFI(lclear_user)
|
|
|
|
|
|
/*
|
|
* unsigned long pa_memcpy(void *dstp, const void *srcp, unsigned long len)
|
|
*
|
|
* Inputs:
|
|
* - sr1 already contains space of source region
|
|
* - sr2 already contains space of destination region
|
|
*
|
|
* Returns:
|
|
* - number of bytes that could not be copied.
|
|
* On success, this will be zero.
|
|
*
|
|
* This code is based on a C-implementation of a copy routine written by
|
|
* Randolph Chung, which in turn was derived from the glibc.
|
|
*
|
|
* Several strategies are tried to try to get the best performance for various
|
|
* conditions. In the optimal case, we copy by loops that copy 32- or 16-bytes
|
|
* at a time using general registers. Unaligned copies are handled either by
|
|
* aligning the destination and then using shift-and-write method, or in a few
|
|
* cases by falling back to a byte-at-a-time copy.
|
|
*
|
|
* Testing with various alignments and buffer sizes shows that this code is
|
|
* often >10x faster than a simple byte-at-a-time copy, even for strangely
|
|
* aligned operands. It is interesting to note that the glibc version of memcpy
|
|
* (written in C) is actually quite fast already. This routine is able to beat
|
|
* it by 30-40% for aligned copies because of the loop unrolling, but in some
|
|
* cases the glibc version is still slightly faster. This lends more
|
|
* credibility that gcc can generate very good code as long as we are careful.
|
|
*
|
|
* Possible optimizations:
|
|
* - add cache prefetching
|
|
* - try not to use the post-increment address modifiers; they may create
|
|
* additional interlocks. Assumption is that those were only efficient on old
|
|
* machines (pre PA8000 processors)
|
|
*/
|
|
|
|
dst = arg0
|
|
src = arg1
|
|
len = arg2
|
|
end = arg3
|
|
t1 = r19
|
|
t2 = r20
|
|
t3 = r21
|
|
t4 = r22
|
|
srcspc = sr1
|
|
dstspc = sr2
|
|
|
|
t0 = r1
|
|
a1 = t1
|
|
a2 = t2
|
|
a3 = t3
|
|
a0 = t4
|
|
|
|
save_src = ret0
|
|
save_dst = ret1
|
|
save_len = r31
|
|
|
|
ENTRY_CFI(pa_memcpy)
|
|
/* Last destination address */
|
|
add dst,len,end
|
|
|
|
/* short copy with less than 16 bytes? */
|
|
cmpib,COND(>>=),n 15,len,.Lbyte_loop
|
|
|
|
/* same alignment? */
|
|
xor src,dst,t0
|
|
extru t0,31,2,t1
|
|
cmpib,<>,n 0,t1,.Lunaligned_copy
|
|
|
|
#ifdef CONFIG_64BIT
|
|
/* only do 64-bit copies if we can get aligned. */
|
|
extru t0,31,3,t1
|
|
cmpib,<>,n 0,t1,.Lalign_loop32
|
|
|
|
/* loop until we are 64-bit aligned */
|
|
.Lalign_loop64:
|
|
extru dst,31,3,t1
|
|
cmpib,=,n 0,t1,.Lcopy_loop_16_start
|
|
20: ldb,ma 1(srcspc,src),t1
|
|
21: stb,ma t1,1(dstspc,dst)
|
|
b .Lalign_loop64
|
|
ldo -1(len),len
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done)
|
|
|
|
.Lcopy_loop_16_start:
|
|
ldi 31,t0
|
|
.Lcopy_loop_16:
|
|
cmpb,COND(>>=),n t0,len,.Lword_loop
|
|
|
|
10: ldd 0(srcspc,src),t1
|
|
11: ldd 8(srcspc,src),t2
|
|
ldo 16(src),src
|
|
12: std,ma t1,8(dstspc,dst)
|
|
13: std,ma t2,8(dstspc,dst)
|
|
14: ldd 0(srcspc,src),t1
|
|
15: ldd 8(srcspc,src),t2
|
|
ldo 16(src),src
|
|
16: std,ma t1,8(dstspc,dst)
|
|
17: std,ma t2,8(dstspc,dst)
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(11b,.Lcopy16_fault)
|
|
ASM_EXCEPTIONTABLE_ENTRY(12b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(13b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(14b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(15b,.Lcopy16_fault)
|
|
ASM_EXCEPTIONTABLE_ENTRY(16b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(17b,.Lcopy_done)
|
|
|
|
b .Lcopy_loop_16
|
|
ldo -32(len),len
|
|
|
|
.Lword_loop:
|
|
cmpib,COND(>>=),n 3,len,.Lbyte_loop
|
|
20: ldw,ma 4(srcspc,src),t1
|
|
21: stw,ma t1,4(dstspc,dst)
|
|
b .Lword_loop
|
|
ldo -4(len),len
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done)
|
|
|
|
#endif /* CONFIG_64BIT */
|
|
|
|
/* loop until we are 32-bit aligned */
|
|
.Lalign_loop32:
|
|
extru dst,31,2,t1
|
|
cmpib,=,n 0,t1,.Lcopy_loop_8
|
|
20: ldb,ma 1(srcspc,src),t1
|
|
21: stb,ma t1,1(dstspc,dst)
|
|
b .Lalign_loop32
|
|
ldo -1(len),len
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done)
|
|
|
|
|
|
.Lcopy_loop_8:
|
|
cmpib,COND(>>=),n 15,len,.Lbyte_loop
|
|
|
|
10: ldw 0(srcspc,src),t1
|
|
11: ldw 4(srcspc,src),t2
|
|
12: stw,ma t1,4(dstspc,dst)
|
|
13: stw,ma t2,4(dstspc,dst)
|
|
14: ldw 8(srcspc,src),t1
|
|
15: ldw 12(srcspc,src),t2
|
|
ldo 16(src),src
|
|
16: stw,ma t1,4(dstspc,dst)
|
|
17: stw,ma t2,4(dstspc,dst)
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(11b,.Lcopy8_fault)
|
|
ASM_EXCEPTIONTABLE_ENTRY(12b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(13b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(14b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(15b,.Lcopy8_fault)
|
|
ASM_EXCEPTIONTABLE_ENTRY(16b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(17b,.Lcopy_done)
|
|
|
|
b .Lcopy_loop_8
|
|
ldo -16(len),len
|
|
|
|
.Lbyte_loop:
|
|
cmpclr,COND(<>) len,%r0,%r0
|
|
b,n .Lcopy_done
|
|
20: ldb 0(srcspc,src),t1
|
|
ldo 1(src),src
|
|
21: stb,ma t1,1(dstspc,dst)
|
|
b .Lbyte_loop
|
|
ldo -1(len),len
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done)
|
|
|
|
.Lcopy_done:
|
|
bv %r0(%r2)
|
|
sub end,dst,ret0
|
|
|
|
|
|
/* src and dst are not aligned the same way. */
|
|
/* need to go the hard way */
|
|
.Lunaligned_copy:
|
|
/* align until dst is 32bit-word-aligned */
|
|
extru dst,31,2,t1
|
|
cmpib,=,n 0,t1,.Lcopy_dstaligned
|
|
20: ldb 0(srcspc,src),t1
|
|
ldo 1(src),src
|
|
21: stb,ma t1,1(dstspc,dst)
|
|
b .Lunaligned_copy
|
|
ldo -1(len),len
|
|
|
|
ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done)
|
|
ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done)
|
|
|
|
.Lcopy_dstaligned:
|
|
|
|
/* store src, dst and len in safe place */
|
|
copy src,save_src
|
|
copy dst,save_dst
|
|
copy len,save_len
|
|
|
|
/* len now needs give number of words to copy */
|
|
SHRREG len,2,len
|
|
|
|
/*
|
|
* Copy from a not-aligned src to an aligned dst using shifts.
|
|
* Handles 4 words per loop.
|
|
*/
|
|
|
|
depw,z src,28,2,t0
|
|
subi 32,t0,t0
|
|
mtsar t0
|
|
extru len,31,2,t0
|
|
cmpib,= 2,t0,.Lcase2
|
|
/* Make src aligned by rounding it down. */
|
|
depi 0,31,2,src
|
|
|
|
cmpiclr,<> 3,t0,%r0
|
|
b,n .Lcase3
|
|
cmpiclr,<> 1,t0,%r0
|
|
b,n .Lcase1
|
|
.Lcase0:
|
|
cmpb,COND(=) %r0,len,.Lcda_finish
|
|
nop
|
|
|
|
1: ldw,ma 4(srcspc,src), a3
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
1: ldw,ma 4(srcspc,src), a0
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
b,n .Ldo3
|
|
.Lcase1:
|
|
1: ldw,ma 4(srcspc,src), a2
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
1: ldw,ma 4(srcspc,src), a3
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
ldo -1(len),len
|
|
cmpb,COND(=),n %r0,len,.Ldo0
|
|
.Ldo4:
|
|
1: ldw,ma 4(srcspc,src), a0
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
shrpw a2, a3, %sar, t0
|
|
1: stw,ma t0, 4(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done)
|
|
.Ldo3:
|
|
1: ldw,ma 4(srcspc,src), a1
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
shrpw a3, a0, %sar, t0
|
|
1: stw,ma t0, 4(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done)
|
|
.Ldo2:
|
|
1: ldw,ma 4(srcspc,src), a2
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
shrpw a0, a1, %sar, t0
|
|
1: stw,ma t0, 4(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done)
|
|
.Ldo1:
|
|
1: ldw,ma 4(srcspc,src), a3
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
shrpw a1, a2, %sar, t0
|
|
1: stw,ma t0, 4(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done)
|
|
ldo -4(len),len
|
|
cmpb,COND(<>) %r0,len,.Ldo4
|
|
nop
|
|
.Ldo0:
|
|
shrpw a2, a3, %sar, t0
|
|
1: stw,ma t0, 4(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done)
|
|
|
|
.Lcda_rdfault:
|
|
.Lcda_finish:
|
|
/* calculate new src, dst and len and jump to byte-copy loop */
|
|
sub dst,save_dst,t0
|
|
add save_src,t0,src
|
|
b .Lbyte_loop
|
|
sub save_len,t0,len
|
|
|
|
.Lcase3:
|
|
1: ldw,ma 4(srcspc,src), a0
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
1: ldw,ma 4(srcspc,src), a1
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
b .Ldo2
|
|
ldo 1(len),len
|
|
.Lcase2:
|
|
1: ldw,ma 4(srcspc,src), a1
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
1: ldw,ma 4(srcspc,src), a2
|
|
ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault)
|
|
b .Ldo1
|
|
ldo 2(len),len
|
|
|
|
|
|
/* fault exception fixup handlers: */
|
|
#ifdef CONFIG_64BIT
|
|
.Lcopy16_fault:
|
|
b .Lcopy_done
|
|
10: std,ma t1,8(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done)
|
|
#endif
|
|
|
|
.Lcopy8_fault:
|
|
b .Lcopy_done
|
|
10: stw,ma t1,4(dstspc,dst)
|
|
ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done)
|
|
ENDPROC_CFI(pa_memcpy)
|
|
|
|
.end
|