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Linux/arch/sparc/lib/bzero.S

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Diff markup

Differences between /arch/sparc/lib/bzero.S (Architecture i386) and /arch/sparc/lib/bzero.S (Architecture sparc)


  1 /* SPDX-License-Identifier: GPL-2.0 */              1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /* bzero.S: Simple prefetching memset, bzero,       2 /* bzero.S: Simple prefetching memset, bzero, and clear_user
  3  *          implementations.                        3  *          implementations.
  4  *                                                  4  *
  5  * Copyright (C) 2005 David S. Miller <davem@da      5  * Copyright (C) 2005 David S. Miller <davem@davemloft.net>
  6  */                                                 6  */
  7                                                     7 
  8 #include <linux/export.h>                           8 #include <linux/export.h>
  9 #include <linux/linkage.h>                          9 #include <linux/linkage.h>
 10                                                    10 
 11         .text                                      11         .text
 12                                                    12 
 13 ENTRY(memset) /* %o0=buf, %o1=pat, %o2=len */      13 ENTRY(memset) /* %o0=buf, %o1=pat, %o2=len */
 14         and             %o1, 0xff, %o3             14         and             %o1, 0xff, %o3
 15         mov             %o2, %o1                   15         mov             %o2, %o1
 16         sllx            %o3, 8, %g1                16         sllx            %o3, 8, %g1
 17         or              %g1, %o3, %o2              17         or              %g1, %o3, %o2
 18         sllx            %o2, 16, %g1               18         sllx            %o2, 16, %g1
 19         or              %g1, %o2, %o2              19         or              %g1, %o2, %o2
 20         sllx            %o2, 32, %g1               20         sllx            %o2, 32, %g1
 21         ba,pt           %xcc, 1f                   21         ba,pt           %xcc, 1f
 22          or             %g1, %o2, %o2              22          or             %g1, %o2, %o2
 23                                                    23 
 24 ENTRY(__bzero) /* %o0=buf, %o1=len */              24 ENTRY(__bzero) /* %o0=buf, %o1=len */
 25         clr             %o2                        25         clr             %o2
 26 1:      mov             %o0, %o3                   26 1:      mov             %o0, %o3
 27         brz,pn          %o1, __bzero_done          27         brz,pn          %o1, __bzero_done
 28          cmp            %o1, 16                    28          cmp            %o1, 16
 29         bl,pn           %icc, __bzero_tiny         29         bl,pn           %icc, __bzero_tiny
 30          prefetch       [%o0 + 0x000], #n_writ     30          prefetch       [%o0 + 0x000], #n_writes
 31         andcc           %o0, 0x3, %g0              31         andcc           %o0, 0x3, %g0
 32         be,pt           %icc, 2f                   32         be,pt           %icc, 2f
 33 1:       stb            %o2, [%o0 + 0x00]          33 1:       stb            %o2, [%o0 + 0x00]
 34         add             %o0, 1, %o0                34         add             %o0, 1, %o0
 35         andcc           %o0, 0x3, %g0              35         andcc           %o0, 0x3, %g0
 36         bne,pn          %icc, 1b                   36         bne,pn          %icc, 1b
 37          sub            %o1, 1, %o1                37          sub            %o1, 1, %o1
 38 2:      andcc           %o0, 0x7, %g0              38 2:      andcc           %o0, 0x7, %g0
 39         be,pt           %icc, 3f                   39         be,pt           %icc, 3f
 40          stw            %o2, [%o0 + 0x00]          40          stw            %o2, [%o0 + 0x00]
 41         sub             %o1, 4, %o1                41         sub             %o1, 4, %o1
 42         add             %o0, 4, %o0                42         add             %o0, 4, %o0
 43 3:      and             %o1, 0x38, %g1             43 3:      and             %o1, 0x38, %g1
 44         cmp             %o1, 0x40                  44         cmp             %o1, 0x40
 45         andn            %o1, 0x3f, %o4             45         andn            %o1, 0x3f, %o4
 46         bl,pn           %icc, 5f                   46         bl,pn           %icc, 5f
 47          and            %o1, 0x7, %o1              47          and            %o1, 0x7, %o1
 48         prefetch        [%o0 + 0x040], #n_writ     48         prefetch        [%o0 + 0x040], #n_writes
 49         prefetch        [%o0 + 0x080], #n_writ     49         prefetch        [%o0 + 0x080], #n_writes
 50         prefetch        [%o0 + 0x0c0], #n_writ     50         prefetch        [%o0 + 0x0c0], #n_writes
 51         prefetch        [%o0 + 0x100], #n_writ     51         prefetch        [%o0 + 0x100], #n_writes
 52         prefetch        [%o0 + 0x140], #n_writ     52         prefetch        [%o0 + 0x140], #n_writes
 53 4:      prefetch        [%o0 + 0x180], #n_writ     53 4:      prefetch        [%o0 + 0x180], #n_writes
 54         stx             %o2, [%o0 + 0x00]          54         stx             %o2, [%o0 + 0x00]
 55         stx             %o2, [%o0 + 0x08]          55         stx             %o2, [%o0 + 0x08]
 56         stx             %o2, [%o0 + 0x10]          56         stx             %o2, [%o0 + 0x10]
 57         stx             %o2, [%o0 + 0x18]          57         stx             %o2, [%o0 + 0x18]
 58         stx             %o2, [%o0 + 0x20]          58         stx             %o2, [%o0 + 0x20]
 59         stx             %o2, [%o0 + 0x28]          59         stx             %o2, [%o0 + 0x28]
 60         stx             %o2, [%o0 + 0x30]          60         stx             %o2, [%o0 + 0x30]
 61         stx             %o2, [%o0 + 0x38]          61         stx             %o2, [%o0 + 0x38]
 62         subcc           %o4, 0x40, %o4             62         subcc           %o4, 0x40, %o4
 63         bne,pt          %icc, 4b                   63         bne,pt          %icc, 4b
 64          add            %o0, 0x40, %o0             64          add            %o0, 0x40, %o0
 65         brz,pn          %g1, 6f                    65         brz,pn          %g1, 6f
 66          nop                                       66          nop
 67 5:      stx             %o2, [%o0 + 0x00]          67 5:      stx             %o2, [%o0 + 0x00]
 68         subcc           %g1, 8, %g1                68         subcc           %g1, 8, %g1
 69         bne,pt          %icc, 5b                   69         bne,pt          %icc, 5b
 70          add            %o0, 0x8, %o0              70          add            %o0, 0x8, %o0
 71 6:      brz,pt          %o1, __bzero_done          71 6:      brz,pt          %o1, __bzero_done
 72          nop                                       72          nop
 73 __bzero_tiny:                                      73 __bzero_tiny:
 74 1:      stb             %o2, [%o0 + 0x00]          74 1:      stb             %o2, [%o0 + 0x00]
 75         subcc           %o1, 1, %o1                75         subcc           %o1, 1, %o1
 76         bne,pt          %icc, 1b                   76         bne,pt          %icc, 1b
 77          add            %o0, 1, %o0                77          add            %o0, 1, %o0
 78 __bzero_done:                                      78 __bzero_done:
 79         retl                                       79         retl
 80          mov            %o3, %o0                   80          mov            %o3, %o0
 81 ENDPROC(__bzero)                                   81 ENDPROC(__bzero)
 82 ENDPROC(memset)                                    82 ENDPROC(memset)
 83 EXPORT_SYMBOL(__bzero)                             83 EXPORT_SYMBOL(__bzero)
 84 EXPORT_SYMBOL(memset)                              84 EXPORT_SYMBOL(memset)
 85                                                    85 
 86 #define EX_ST(x,y)              \                  86 #define EX_ST(x,y)              \
 87 98:     x,y;                    \                  87 98:     x,y;                    \
 88         .section __ex_table,"a";\                  88         .section __ex_table,"a";\
 89         .align 4;               \                  89         .align 4;               \
 90         .word 98b, __retl_o1;   \                  90         .word 98b, __retl_o1;   \
 91         .text;                  \                  91         .text;                  \
 92         .align 4;                                  92         .align 4;
 93                                                    93 
 94 ENTRY(__clear_user) /* %o0=buf, %o1=len */         94 ENTRY(__clear_user) /* %o0=buf, %o1=len */
 95         brz,pn          %o1, __clear_user_done     95         brz,pn          %o1, __clear_user_done
 96          cmp            %o1, 16                    96          cmp            %o1, 16
 97         bl,pn           %icc, __clear_user_tin     97         bl,pn           %icc, __clear_user_tiny
 98          EX_ST(prefetcha [%o0 + 0x00] %asi, #n     98          EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes)
 99         andcc           %o0, 0x3, %g0              99         andcc           %o0, 0x3, %g0
100         be,pt           %icc, 2f                  100         be,pt           %icc, 2f
101 1:       EX_ST(stba     %g0, [%o0 + 0x00] %asi    101 1:       EX_ST(stba     %g0, [%o0 + 0x00] %asi)
102         add             %o0, 1, %o0               102         add             %o0, 1, %o0
103         andcc           %o0, 0x3, %g0             103         andcc           %o0, 0x3, %g0
104         bne,pn          %icc, 1b                  104         bne,pn          %icc, 1b
105          sub            %o1, 1, %o1               105          sub            %o1, 1, %o1
106 2:      andcc           %o0, 0x7, %g0             106 2:      andcc           %o0, 0x7, %g0
107         be,pt           %icc, 3f                  107         be,pt           %icc, 3f
108          EX_ST(stwa     %g0, [%o0 + 0x00] %asi    108          EX_ST(stwa     %g0, [%o0 + 0x00] %asi)
109         sub             %o1, 4, %o1               109         sub             %o1, 4, %o1
110         add             %o0, 4, %o0               110         add             %o0, 4, %o0
111 3:      and             %o1, 0x38, %g1            111 3:      and             %o1, 0x38, %g1
112         cmp             %o1, 0x40                 112         cmp             %o1, 0x40
113         andn            %o1, 0x3f, %o4            113         andn            %o1, 0x3f, %o4
114         bl,pn           %icc, 5f                  114         bl,pn           %icc, 5f
115          and            %o1, 0x7, %o1             115          and            %o1, 0x7, %o1
116         EX_ST(prefetcha [%o0 + 0x040] %asi, #n    116         EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes)
117         EX_ST(prefetcha [%o0 + 0x080] %asi, #n    117         EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes)
118         EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n    118         EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes)
119         EX_ST(prefetcha [%o0 + 0x100] %asi, #n    119         EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes)
120         EX_ST(prefetcha [%o0 + 0x140] %asi, #n    120         EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes)
121 4:      EX_ST(prefetcha [%o0 + 0x180] %asi, #n    121 4:      EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes)
122         EX_ST(stxa      %g0, [%o0 + 0x00] %asi    122         EX_ST(stxa      %g0, [%o0 + 0x00] %asi)
123         EX_ST(stxa      %g0, [%o0 + 0x08] %asi    123         EX_ST(stxa      %g0, [%o0 + 0x08] %asi)
124         EX_ST(stxa      %g0, [%o0 + 0x10] %asi    124         EX_ST(stxa      %g0, [%o0 + 0x10] %asi)
125         EX_ST(stxa      %g0, [%o0 + 0x18] %asi    125         EX_ST(stxa      %g0, [%o0 + 0x18] %asi)
126         EX_ST(stxa      %g0, [%o0 + 0x20] %asi    126         EX_ST(stxa      %g0, [%o0 + 0x20] %asi)
127         EX_ST(stxa      %g0, [%o0 + 0x28] %asi    127         EX_ST(stxa      %g0, [%o0 + 0x28] %asi)
128         EX_ST(stxa      %g0, [%o0 + 0x30] %asi    128         EX_ST(stxa      %g0, [%o0 + 0x30] %asi)
129         EX_ST(stxa      %g0, [%o0 + 0x38] %asi    129         EX_ST(stxa      %g0, [%o0 + 0x38] %asi)
130         subcc           %o4, 0x40, %o4            130         subcc           %o4, 0x40, %o4
131         bne,pt          %icc, 4b                  131         bne,pt          %icc, 4b
132          add            %o0, 0x40, %o0            132          add            %o0, 0x40, %o0
133         brz,pn          %g1, 6f                   133         brz,pn          %g1, 6f
134          nop                                      134          nop
135 5:      EX_ST(stxa      %g0, [%o0 + 0x00] %asi    135 5:      EX_ST(stxa      %g0, [%o0 + 0x00] %asi)
136         subcc           %g1, 8, %g1               136         subcc           %g1, 8, %g1
137         bne,pt          %icc, 5b                  137         bne,pt          %icc, 5b
138          add            %o0, 0x8, %o0             138          add            %o0, 0x8, %o0
139 6:      brz,pt          %o1, __clear_user_done    139 6:      brz,pt          %o1, __clear_user_done
140          nop                                      140          nop
141 __clear_user_tiny:                                141 __clear_user_tiny:
142 1:      EX_ST(stba      %g0, [%o0 + 0x00] %asi    142 1:      EX_ST(stba      %g0, [%o0 + 0x00] %asi)
143         subcc           %o1, 1, %o1               143         subcc           %o1, 1, %o1
144         bne,pt          %icc, 1b                  144         bne,pt          %icc, 1b
145          add            %o0, 1, %o0               145          add            %o0, 1, %o0
146 __clear_user_done:                                146 __clear_user_done:
147         retl                                      147         retl
148          clr            %o0                       148          clr            %o0
149 ENDPROC(__clear_user)                             149 ENDPROC(__clear_user)
150 EXPORT_SYMBOL(__clear_user)                       150 EXPORT_SYMBOL(__clear_user)
                                                      

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