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Linux/arch/arm/lib/csumpartial.S

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Diff markup

Differences between /arch/arm/lib/csumpartial.S (Version linux-6.12-rc7) and /arch/sparc64/lib/csumpartial.S (Version linux-4.15.18)


  1 /* SPDX-License-Identifier: GPL-2.0-only */       
  2 /*                                                
  3  *  linux/arch/arm/lib/csumpartial.S              
  4  *                                                
  5  *  Copyright (C) 1995-1998 Russell King          
  6  */                                               
  7 #include <linux/linkage.h>                        
  8 #include <asm/assembler.h>                        
  9                                                   
 10                 .text                             
 11                                                   
 12 /*                                                
 13  * Function: __u32 csum_partial(const char *sr    
 14  * Params  : r0 = buffer, r1 = len, r2 = check    
 15  * Returns : r0 = new checksum                    
 16  */                                               
 17                                                   
 18 buf     .req    r0                                
 19 len     .req    r1                                
 20 sum     .req    r2                                
 21 td0     .req    r3                                
 22 td1     .req    r4      @ save before use         
 23 td2     .req    r5      @ save before use         
 24 td3     .req    lr                                
 25                                                   
 26 .Lzero:         mov     r0, sum                   
 27                 add     sp, sp, #4                
 28                 ldr     pc, [sp], #4              
 29                                                   
 30                 /*                                
 31                  * Handle 0 to 7 bytes, with a    
 32                  * destination pointers.  Note    
 33                  */                               
 34 .Lless8:                teq     len, #0           
 35                 beq     .Lzero                    
 36                                                   
 37                 /* we must have at least one b    
 38                 tst     buf, #1                   
 39                 movne   sum, sum, ror #8          
 40                 ldrbne  td0, [buf], #1            
 41                 subne   len, len, #1              
 42                 adcsne  sum, sum, td0, put_byt    
 43                                                   
 44 .Lless4:                tst     len, #6           
 45                 beq     .Lless8_byte              
 46                                                   
 47                 /* we are now half-word aligne    
 48                                                   
 49 .Lless8_wordlp:                                   
 50 #if __LINUX_ARM_ARCH__ >= 4                       
 51                 ldrh    td0, [buf], #2            
 52                 sub     len, len, #2              
 53 #else                                             
 54                 ldrb    td0, [buf], #1            
 55                 ldrb    td3, [buf], #1            
 56                 sub     len, len, #2              
 57 #ifndef __ARMEB__                                 
 58                 orr     td0, td0, td3, lsl #8     
 59 #else                                             
 60                 orr     td0, td3, td0, lsl #8     
 61 #endif                                            
 62 #endif                                            
 63                 adcs    sum, sum, td0             
 64                 tst     len, #6                   
 65                 bne     .Lless8_wordlp            
 66                                                   
 67 .Lless8_byte:   tst     len, #1                   
 68                 ldrbne  td0, [buf], #1            
 69                 adcsne  sum, sum, td0, put_byt    
 70                                                   
 71 .Ldone:         adc     r0, sum, #0               
 72                 ldr     td0, [sp], #4             
 73                 tst     td0, #1                   
 74                 movne   r0, r0, ror #8            
 75                 ldr     pc, [sp], #4              
 76                                                   
 77 .Lnot_aligned:  tst     buf, #1                   
 78                 ldrbne  td0, [buf], #1            
 79                 subne   len, len, #1              
 80                 adcsne  sum, sum, td0, put_byt    
 81                                                   
 82                 tst     buf, #2                   
 83 #if __LINUX_ARM_ARCH__ >= 4                       
 84                 ldrhne  td0, [buf], #2            
 85                 subne   len, len, #2              
 86 #else                                             
 87                 ldrbne  td0, [buf], #1            
 88                 ldrbne  ip, [buf], #1             
 89                 subne   len, len, #2              
 90 #ifndef __ARMEB__                                 
 91                 orrne   td0, td0, ip, lsl #8      
 92 #else                                             
 93                 orrne   td0, ip, td0, lsl #8      
 94 #endif                                            
 95 #endif                                            
 96                 adcsne  sum, sum, td0             
 97                 ret     lr                        
 98                                                   
 99 ENTRY(csum_partial)                               
100                 stmfd   sp!, {buf, lr}            
101                 cmp     len, #8                   
102                 blo     .Lless8                   
103                                                   
104                 tst     buf, #1                   
105                 movne   sum, sum, ror #8          
106                                                   
107                 adds    sum, sum, #0              
108                 tst     buf, #3                   
109                 blne    .Lnot_aligned             
110                                                   
111 1:              bics    ip, len, #31              
112                 beq     3f                        
113                                                   
114                 stmfd   sp!, {r4 - r5}            
115 2:              ldmia   buf!, {td0, td1, td2,     
116                 adcs    sum, sum, td0             
117                 adcs    sum, sum, td1             
118                 adcs    sum, sum, td2             
119                 adcs    sum, sum, td3             
120                 ldmia   buf!, {td0, td1, td2,     
121                 adcs    sum, sum, td0             
122                 adcs    sum, sum, td1             
123                 adcs    sum, sum, td2             
124                 adcs    sum, sum, td3             
125                 sub     ip, ip, #32               
126                 teq     ip, #0                    
127                 bne     2b                        
128                 ldmfd   sp!, {r4 - r5}            
129                                                   
130 3:              tst     len, #0x1c                
131                 beq     .Lless4                   
132                                                   
133 4:              ldr     td0, [buf], #4            
134                 sub     len, len, #4              
135                 adcs    sum, sum, td0             
136                 tst     len, #0x1c                
137                 bne     4b                        
138                 b       .Lless4                   
139 ENDPROC(csum_partial)                             
                                                      

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