/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* IP/TCP/UDP checksumming routines
*
* Authors: Jorge Cwik, <[email protected]>
* Arnt Gulbrandsen, <[email protected]>
* Tom May, <[email protected]>
* Pentium Pro/II routines:
* Alexander Kjeldaas <[email protected]>
* Finn Arne Gangstad <[email protected]>
* Lots of code moved from tcp.c and ip.c; see those files
* for more names.
*
* Changes: Ingo Molnar, converted csum_partial_copy() to 2.1 exception
* handling.
* Andi Kleen, add zeroing on error
* converted to pure assembler
*/
#include <linux/export.h>
#include <linux/linkage.h>
#include <asm/errno.h>
#include <asm/asm.h>
#include <asm/nospec-branch.h>
/*
* computes a partial checksum, e.g. for TCP/UDP fragments
*/
/*
unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
*/
.text
#ifndef CONFIG_X86_USE_PPRO_CHECKSUM
/*
* Experiments with Ethernet and SLIP connections show that buff
* is aligned on either a 2-byte or 4-byte boundary. We get at
* least a twofold speedup on 486 and Pentium if it is 4-byte aligned.
* Fortunately, it is easy to convert 2-byte alignment to 4-byte
* alignment for the unrolled loop.
*/
SYM_FUNC_START(csum_partial)
pushl %esi
pushl %ebx
movl 20(%esp),%eax # Function arg: unsigned int sum
movl 16(%esp),%ecx # Function arg: int len
movl 12(%esp),%esi # Function arg: unsigned char *buff
testl $3, %esi # Check alignment.
jz 2f # Jump if alignment is ok.
testl $1, %esi # Check alignment.
jz 10f # Jump if alignment is boundary of 2 bytes.
# buf is odd
dec %ecx
jl 8f
movzbl (%esi), %ebx
adcl %ebx, %eax
roll $8, %eax
inc %esi
testl $2, %esi
jz 2f
10:
subl $2, %ecx # Alignment uses up two bytes.
jae 1f # Jump if we had at least two bytes.
addl $2, %ecx # ecx was < 2. Deal with it.
jmp 4f
1: movw (%esi), %bx
addl $2, %esi
addw %bx, %ax
adcl $0, %eax
2:
movl %ecx, %edx
shrl $5, %ecx
jz 2f
testl %esi, %esi
1: movl (%esi), %ebx
adcl %ebx, %eax
movl 4(%esi), %ebx
adcl %ebx, %eax
movl 8(%esi), %ebx
adcl %ebx, %eax
movl 12(%esi), %ebx
adcl %ebx, %eax
movl 16(%esi), %ebx
adcl %ebx, %eax
movl 20(%esi), %ebx
adcl %ebx, %eax
movl 24(%esi), %ebx
adcl %ebx, %eax
movl 28(%esi), %ebx
adcl %ebx, %eax
lea 32(%esi), %esi
dec %ecx
jne 1b
adcl $0, %eax
2: movl %edx, %ecx
andl $0x1c, %edx
je 4f
shrl $2, %edx # This clears CF
3: adcl (%esi), %eax
lea 4(%esi), %esi
dec %edx
jne 3b
adcl $0, %eax
4: andl $3, %ecx
jz 7f
cmpl $2, %ecx
jb 5f
movw (%esi),%cx
leal 2(%esi),%esi
je 6f
shll $16,%ecx
5: movb (%esi),%cl
6: addl %ecx,%eax
adcl $0, %eax
7:
testb $1, 12(%esp)
jz 8f
roll $8, %eax
8:
popl %ebx
popl %esi
RET
SYM_FUNC_END(csum_partial)
#else
/* Version for PentiumII/PPro */
SYM_FUNC_START(csum_partial)
pushl %esi
pushl %ebx
movl 20(%esp),%eax # Function arg: unsigned int sum
movl 16(%esp),%ecx # Function arg: int len
movl 12(%esp),%esi # Function arg: const unsigned char *buf
testl $3, %esi
jnz 25f
10:
movl %ecx, %edx
movl %ecx, %ebx
andl $0x7c, %ebx
shrl $7, %ecx
addl %ebx,%esi
shrl $2, %ebx
negl %ebx
lea 45f(%ebx,%ebx,2), %ebx
testl %esi, %esi
JMP_NOSPEC ebx
# Handle 2-byte-aligned regions
20: addw (%esi), %ax
lea 2(%esi), %esi
adcl $0, %eax
jmp 10b
25:
testl $1, %esi
jz 30f
# buf is odd
dec %ecx
jl 90f
movzbl (%esi), %ebx
addl %ebx, %eax
adcl $0, %eax
roll $8, %eax
inc %esi
testl $2, %esi
jz 10b
30: subl $2, %ecx
ja 20b
je 32f
addl $2, %ecx
jz 80f
movzbl (%esi),%ebx # csumming 1 byte, 2-aligned
addl %ebx, %eax
adcl $0, %eax
jmp 80f
32:
addw (%esi), %ax # csumming 2 bytes, 2-aligned
adcl $0, %eax
jmp 80f
40:
addl -128(%esi), %eax
adcl -124(%esi), %eax
adcl -120(%esi), %eax
adcl -116(%esi), %eax
adcl -112(%esi), %eax
adcl -108(%esi), %eax
adcl -104(%esi), %eax
adcl -100(%esi), %eax
adcl -96(%esi), %eax
adcl -92(%esi), %eax
adcl -88(%esi), %eax
adcl -84(%esi), %eax
adcl -80(%esi), %eax
adcl -76(%esi), %eax
adcl -72(%esi), %eax
adcl -68(%esi), %eax
adcl -64(%esi), %eax
adcl -60(%esi), %eax
adcl -56(%esi), %eax
adcl -52(%esi), %eax
adcl -48(%esi), %eax
adcl -44(%esi), %eax
adcl -40(%esi), %eax
adcl -36(%esi), %eax
adcl -32(%esi), %eax
adcl -28(%esi), %eax
adcl -24(%esi), %eax
adcl -20(%esi), %eax
adcl -16(%esi), %eax
adcl -12(%esi), %eax
adcl -8(%esi), %eax
adcl -4(%esi), %eax
45:
lea 128(%esi), %esi
adcl $0, %eax
dec %ecx
jge 40b
movl %edx, %ecx
50: andl $3, %ecx
jz 80f
# Handle the last 1-3 bytes without jumping
notl %ecx # 1->2, 2->1, 3->0, higher bits are masked
movl $0xffffff,%ebx # by the shll and shrl instructions
shll $3,%ecx
shrl %cl,%ebx
andl -128(%esi),%ebx # esi is 4-aligned so should be ok
addl %ebx,%eax
adcl $0,%eax
80:
testb $1, 12(%esp)
jz 90f
roll $8, %eax
90:
popl %ebx
popl %esi
RET
SYM_FUNC_END(csum_partial)
#endif
EXPORT_SYMBOL(csum_partial)
/*
unsigned int csum_partial_copy_generic (const char *src, char *dst,
int len)
*/
/*
* Copy from ds while checksumming, otherwise like csum_partial
*/
#define EXC(y...) \
9999: y; \
_ASM_EXTABLE_TYPE(9999b, 7f, EX_TYPE_UACCESS | EX_FLAG_CLEAR_AX)
#ifndef CONFIG_X86_USE_PPRO_CHECKSUM
#define ARGBASE 16
#define FP 12
SYM_FUNC_START(csum_partial_copy_generic)
subl $4,%esp
pushl %edi
pushl %esi
pushl %ebx
movl ARGBASE+12(%esp),%ecx # len
movl ARGBASE+4(%esp),%esi # src
movl ARGBASE+8(%esp),%edi # dst
movl $-1, %eax # sum
testl $2, %edi # Check alignment.
jz 2f # Jump if alignment is ok.
subl $2, %ecx # Alignment uses up two bytes.
jae 1f # Jump if we had at least two bytes.
addl $2, %ecx # ecx was < 2. Deal with it.
jmp 4f
EXC(1: movw (%esi), %bx )
addl $2, %esi
EXC( movw %bx, (%edi) )
addl $2, %edi
addw %bx, %ax
adcl $0, %eax
2:
movl %ecx, FP(%esp)
shrl $5, %ecx
jz 2f
testl %esi, %esi # what's wrong with clc?
EXC(1: movl (%esi), %ebx )
EXC( movl 4(%esi), %edx )
adcl %ebx, %eax
EXC( movl %ebx, (%edi) )
adcl %edx, %eax
EXC( movl %edx, 4(%edi) )
EXC( movl 8(%esi), %ebx )
EXC( movl 12(%esi), %edx )
adcl %ebx, %eax
EXC( movl %ebx, 8(%edi) )
adcl %edx, %eax
EXC( movl %edx, 12(%edi) )
EXC( movl 16(%esi), %ebx )
EXC( movl 20(%esi), %edx )
adcl %ebx, %eax
EXC( movl %ebx, 16(%edi) )
adcl %edx, %eax
EXC( movl %edx, 20(%edi) )
EXC( movl 24(%esi), %ebx )
EXC( movl 28(%esi), %edx )
adcl %ebx, %eax
EXC( movl %ebx, 24(%edi) )
adcl %edx, %eax
EXC( movl %edx, 28(%edi) )
lea 32(%esi), %esi
lea 32(%edi), %edi
dec %ecx
jne 1b
adcl $0, %eax
2: movl FP(%esp), %edx
movl %edx, %ecx
andl $0x1c, %edx
je 4f
shrl $2, %edx # This clears CF
EXC(3: movl (%esi), %ebx )
adcl %ebx, %eax
EXC( movl %ebx, (%edi) )
lea 4(%esi), %esi
lea 4(%edi), %edi
dec %edx
jne 3b
adcl $0, %eax
4: andl $3, %ecx
jz 7f
cmpl $2, %ecx
jb 5f
EXC( movw (%esi), %cx )
leal 2(%esi), %esi
EXC( movw %cx, (%edi) )
leal 2(%edi), %edi
je 6f
shll $16,%ecx
EXC(5: movb (%esi), %cl )
EXC( movb %cl, (%edi) )
6: addl %ecx, %eax
adcl $0, %eax
7:
popl %ebx
popl %esi
popl %edi
popl %ecx # equivalent to addl $4,%esp
RET
SYM_FUNC_END(csum_partial_copy_generic)
#else
/* Version for PentiumII/PPro */
#define ROUND1(x) \
EXC(movl x(%esi), %ebx ) ; \
addl %ebx, %eax ; \
EXC(movl %ebx, x(%edi) ) ;
#define ROUND(x) \
EXC(movl x(%esi), %ebx ) ; \
adcl %ebx, %eax ; \
EXC(movl %ebx, x(%edi) ) ;
#define ARGBASE 12
SYM_FUNC_START(csum_partial_copy_generic)
pushl %ebx
pushl %edi
pushl %esi
movl ARGBASE+4(%esp),%esi #src
movl ARGBASE+8(%esp),%edi #dst
movl ARGBASE+12(%esp),%ecx #len
movl $-1, %eax #sum
# movl %ecx, %edx
movl %ecx, %ebx
movl %esi, %edx
shrl $6, %ecx
andl $0x3c, %ebx
negl %ebx
subl %ebx, %esi
subl %ebx, %edi
lea -1(%esi),%edx
andl $-32,%edx
lea 3f(%ebx,%ebx), %ebx
testl %esi, %esi
JMP_NOSPEC ebx
1: addl $64,%esi
addl $64,%edi
EXC(movb -32(%edx),%bl) ; EXC(movb (%edx),%bl)
ROUND1(-64) ROUND(-60) ROUND(-56) ROUND(-52)
ROUND (-48) ROUND(-44) ROUND(-40) ROUND(-36)
ROUND (-32) ROUND(-28) ROUND(-24) ROUND(-20)
ROUND (-16) ROUND(-12) ROUND(-8) ROUND(-4)
3: adcl $0,%eax
addl $64, %edx
dec %ecx
jge 1b
4: movl ARGBASE+12(%esp),%edx #len
andl $3, %edx
jz 7f
cmpl $2, %edx
jb 5f
EXC( movw (%esi), %dx )
leal 2(%esi), %esi
EXC( movw %dx, (%edi) )
leal 2(%edi), %edi
je 6f
shll $16,%edx
5:
EXC( movb (%esi), %dl )
EXC( movb %dl, (%edi) )
6: addl %edx, %eax
adcl $0, %eax
7:
popl %esi
popl %edi
popl %ebx
RET
SYM_FUNC_END(csum_partial_copy_generic)
#undef ROUND
#undef ROUND1
#endif
EXPORT_SYMBOL(csum_partial_copy_generic)
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