checksum.S
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上传日期:2013-04-10
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- /* checksum.S: Sparc optimized checksum code.
- *
- * Copyright(C) 1995 Linus Torvalds
- * Copyright(C) 1995 Miguel de Icaza
- * Copyright(C) 1996 David S. Miller
- * Copyright(C) 1997 Jakub Jelinek
- *
- * derived from:
- * Linux/Alpha checksum c-code
- * Linux/ix86 inline checksum assembly
- * RFC1071 Computing the Internet Checksum (esp. Jacobsons m68k code)
- * David Mosberger-Tang for optimized reference c-code
- * BSD4.4 portable checksum routine
- */
- #include <asm/cprefix.h>
- #include <asm/errno.h>
- #define CSUM_BIGCHUNK(buf, offset, sum, t0, t1, t2, t3, t4, t5)
- ldd [buf + offset + 0x00], t0;
- ldd [buf + offset + 0x08], t2;
- addxcc t0, sum, sum;
- addxcc t1, sum, sum;
- ldd [buf + offset + 0x10], t4;
- addxcc t2, sum, sum;
- addxcc t3, sum, sum;
- ldd [buf + offset + 0x18], t0;
- addxcc t4, sum, sum;
- addxcc t5, sum, sum;
- addxcc t0, sum, sum;
- addxcc t1, sum, sum;
- #define CSUM_LASTCHUNK(buf, offset, sum, t0, t1, t2, t3)
- ldd [buf - offset - 0x08], t0;
- ldd [buf - offset - 0x00], t2;
- addxcc t0, sum, sum;
- addxcc t1, sum, sum;
- addxcc t2, sum, sum;
- addxcc t3, sum, sum;
- /* Do end cruft out of band to get better cache patterns. */
- csum_partial_end_cruft:
- be 1f ! caller asks %o1 & 0x8
- andcc %o1, 4, %g0 ! nope, check for word remaining
- ldd [%o0], %g2 ! load two
- addcc %g2, %o2, %o2 ! add first word to sum
- addxcc %g3, %o2, %o2 ! add second word as well
- add %o0, 8, %o0 ! advance buf ptr
- addx %g0, %o2, %o2 ! add in final carry
- andcc %o1, 4, %g0 ! check again for word remaining
- 1: be 1f ! nope, skip this code
- andcc %o1, 3, %o1 ! check for trailing bytes
- ld [%o0], %g2 ! load it
- addcc %g2, %o2, %o2 ! add to sum
- add %o0, 4, %o0 ! advance buf ptr
- addx %g0, %o2, %o2 ! add in final carry
- andcc %o1, 3, %g0 ! check again for trailing bytes
- 1: be 1f ! no trailing bytes, return
- addcc %o1, -1, %g0 ! only one byte remains?
- bne 2f ! at least two bytes more
- subcc %o1, 2, %o1 ! only two bytes more?
- b 4f ! only one byte remains
- or %g0, %g0, %o4 ! clear fake hword value
- 2: lduh [%o0], %o4 ! get hword
- be 6f ! jmp if only hword remains
- add %o0, 2, %o0 ! advance buf ptr either way
- sll %o4, 16, %o4 ! create upper hword
- 4: ldub [%o0], %o5 ! get final byte
- sll %o5, 8, %o5 ! put into place
- or %o5, %o4, %o4 ! coalese with hword (if any)
- 6: addcc %o4, %o2, %o2 ! add to sum
- 1: retl ! get outta here
- addx %g0, %o2, %o0 ! add final carry into retval
- /* Also do alignment out of band to get better cache patterns. */
- csum_partial_fix_alignment:
- cmp %o1, 6
- bl cpte - 0x4
- andcc %o0, 0x2, %g0
- be 1f
- andcc %o0, 0x4, %g0
- lduh [%o0 + 0x00], %g2
- sub %o1, 2, %o1
- add %o0, 2, %o0
- sll %g2, 16, %g2
- addcc %g2, %o2, %o2
- srl %o2, 16, %g3
- addx %g0, %g3, %g2
- sll %o2, 16, %o2
- sll %g2, 16, %g3
- srl %o2, 16, %o2
- andcc %o0, 0x4, %g0
- or %g3, %o2, %o2
- 1: be cpa
- andcc %o1, 0xffffff80, %o3
- ld [%o0 + 0x00], %g2
- sub %o1, 4, %o1
- addcc %g2, %o2, %o2
- add %o0, 4, %o0
- addx %g0, %o2, %o2
- b cpa
- andcc %o1, 0xffffff80, %o3
- /* The common case is to get called with a nicely aligned
- * buffer of size 0x20. Follow the code path for that case.
- */
- .globl C_LABEL(csum_partial)
- C_LABEL(csum_partial): /* %o0=buf, %o1=len, %o2=sum */
- andcc %o0, 0x7, %g0 ! alignment problems?
- bne csum_partial_fix_alignment ! yep, handle it
- sethi %hi(cpte - 8), %g7 ! prepare table jmp ptr
- andcc %o1, 0xffffff80, %o3 ! num loop iterations
- cpa: be 3f ! none to do
- andcc %o1, 0x70, %g1 ! clears carry flag too
- 5: CSUM_BIGCHUNK(%o0, 0x00, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
- CSUM_BIGCHUNK(%o0, 0x20, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
- CSUM_BIGCHUNK(%o0, 0x40, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
- CSUM_BIGCHUNK(%o0, 0x60, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
- addx %g0, %o2, %o2 ! sink in final carry
- subcc %o3, 128, %o3 ! detract from loop iters
- bne 5b ! more to do
- add %o0, 128, %o0 ! advance buf ptr
- andcc %o1, 0x70, %g1 ! clears carry flag too
- 3: be cpte ! nope
- andcc %o1, 0xf, %g0 ! anything left at all?
- srl %g1, 1, %o4 ! compute offset
- sub %g7, %g1, %g7 ! adjust jmp ptr
- sub %g7, %o4, %g7 ! final jmp ptr adjust
- jmp %g7 + %lo(cpte - 8) ! enter the table
- add %o0, %g1, %o0 ! advance buf ptr
- cptbl: CSUM_LASTCHUNK(%o0, 0x68, %o2, %g2, %g3, %g4, %g5)
- CSUM_LASTCHUNK(%o0, 0x58, %o2, %g2, %g3, %g4, %g5)
- CSUM_LASTCHUNK(%o0, 0x48, %o2, %g2, %g3, %g4, %g5)
- CSUM_LASTCHUNK(%o0, 0x38, %o2, %g2, %g3, %g4, %g5)
- CSUM_LASTCHUNK(%o0, 0x28, %o2, %g2, %g3, %g4, %g5)
- CSUM_LASTCHUNK(%o0, 0x18, %o2, %g2, %g3, %g4, %g5)
- CSUM_LASTCHUNK(%o0, 0x08, %o2, %g2, %g3, %g4, %g5)
- addx %g0, %o2, %o2 ! fetch final carry
- andcc %o1, 0xf, %g0 ! anything left at all?
- cpte: bne csum_partial_end_cruft ! yep, handle it
- andcc %o1, 8, %g0 ! check how much
- cpout: retl ! get outta here
- mov %o2, %o0 ! return computed csum
- .globl C_LABEL(__csum_partial_copy_start), C_LABEL(__csum_partial_copy_end)
- C_LABEL(__csum_partial_copy_start):
- #define EX(x,y,a,b,z)
- 98: x,y;
- .section .fixup,z##alloc,z##execinstr;
- .align 4;
- 99: ba 30f;
- a, b, %o3;
- .section __ex_table,z##alloc;
- .align 4;
- .word 98b, 99b;
- .text;
- .align 4
- #define EX2(x,y,z)
- 98: x,y;
- .section __ex_table,z##alloc;
- .align 4;
- .word 98b, 30f;
- .text;
- .align 4
- #define EX3(x,y,z)
- 98: x,y;
- .section __ex_table,z##alloc;
- .align 4;
- .word 98b, 96f;
- .text;
- .align 4
- #define EXT(start,end,handler,z)
- .section __ex_table,z##alloc;
- .align 4;
- .word start, 0, end, handler;
- .text;
- .align 4
- /* This aligned version executes typically in 8.5 superscalar cycles, this
- * is the best I can do. I say 8.5 because the final add will pair with
- * the next ldd in the main unrolled loop. Thus the pipe is always full.
- * If you change these macros (including order of instructions),
- * please check the fixup code below as well.
- */
- #define CSUMCOPY_BIGCHUNK_ALIGNED(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7)
- ldd [src + off + 0x00], t0;
- ldd [src + off + 0x08], t2;
- addxcc t0, sum, sum;
- ldd [src + off + 0x10], t4;
- addxcc t1, sum, sum;
- ldd [src + off + 0x18], t6;
- addxcc t2, sum, sum;
- std t0, [dst + off + 0x00];
- addxcc t3, sum, sum;
- std t2, [dst + off + 0x08];
- addxcc t4, sum, sum;
- std t4, [dst + off + 0x10];
- addxcc t5, sum, sum;
- std t6, [dst + off + 0x18];
- addxcc t6, sum, sum;
- addxcc t7, sum, sum;
- /* 12 superscalar cycles seems to be the limit for this case,
- * because of this we thus do all the ldd's together to get
- * Viking MXCC into streaming mode. Ho hum...
- */
- #define CSUMCOPY_BIGCHUNK(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7)
- ldd [src + off + 0x00], t0;
- ldd [src + off + 0x08], t2;
- ldd [src + off + 0x10], t4;
- ldd [src + off + 0x18], t6;
- st t0, [dst + off + 0x00];
- addxcc t0, sum, sum;
- st t1, [dst + off + 0x04];
- addxcc t1, sum, sum;
- st t2, [dst + off + 0x08];
- addxcc t2, sum, sum;
- st t3, [dst + off + 0x0c];
- addxcc t3, sum, sum;
- st t4, [dst + off + 0x10];
- addxcc t4, sum, sum;
- st t5, [dst + off + 0x14];
- addxcc t5, sum, sum;
- st t6, [dst + off + 0x18];
- addxcc t6, sum, sum;
- st t7, [dst + off + 0x1c];
- addxcc t7, sum, sum;
- /* Yuck, 6 superscalar cycles... */
- #define CSUMCOPY_LASTCHUNK(src, dst, sum, off, t0, t1, t2, t3)
- ldd [src - off - 0x08], t0;
- ldd [src - off - 0x00], t2;
- addxcc t0, sum, sum;
- st t0, [dst - off - 0x08];
- addxcc t1, sum, sum;
- st t1, [dst - off - 0x04];
- addxcc t2, sum, sum;
- st t2, [dst - off - 0x00];
- addxcc t3, sum, sum;
- st t3, [dst - off + 0x04];
- /* Handle the end cruft code out of band for better cache patterns. */
- cc_end_cruft:
- be 1f
- andcc %o3, 4, %g0
- EX(ldd [%o0 + 0x00], %g2, and %o3, 0xf,#)
- add %o1, 8, %o1
- addcc %g2, %g7, %g7
- add %o0, 8, %o0
- addxcc %g3, %g7, %g7
- EX2(st %g2, [%o1 - 0x08],#)
- addx %g0, %g7, %g7
- andcc %o3, 4, %g0
- EX2(st %g3, [%o1 - 0x04],#)
- 1: be 1f
- andcc %o3, 3, %o3
- EX(ld [%o0 + 0x00], %g2, add %o3, 4,#)
- add %o1, 4, %o1
- addcc %g2, %g7, %g7
- EX2(st %g2, [%o1 - 0x04],#)
- addx %g0, %g7, %g7
- andcc %o3, 3, %g0
- add %o0, 4, %o0
- 1: be 1f
- addcc %o3, -1, %g0
- bne 2f
- subcc %o3, 2, %o3
- b 4f
- or %g0, %g0, %o4
- 2: EX(lduh [%o0 + 0x00], %o4, add %o3, 2,#)
- add %o0, 2, %o0
- EX2(sth %o4, [%o1 + 0x00],#)
- be 6f
- add %o1, 2, %o1
- sll %o4, 16, %o4
- 4: EX(ldub [%o0 + 0x00], %o5, add %g0, 1,#)
- EX2(stb %o5, [%o1 + 0x00],#)
- sll %o5, 8, %o5
- or %o5, %o4, %o4
- 6: addcc %o4, %g7, %g7
- 1: retl
- addx %g0, %g7, %o0
- /* Also, handle the alignment code out of band. */
- cc_dword_align:
- cmp %g1, 6
- bl,a ccte
- andcc %g1, 0xf, %o3
- andcc %o0, 0x1, %g0
- bne ccslow
- andcc %o0, 0x2, %g0
- be 1f
- andcc %o0, 0x4, %g0
- EX(lduh [%o0 + 0x00], %g4, add %g1, 0,#)
- sub %g1, 2, %g1
- EX2(sth %g4, [%o1 + 0x00],#)
- add %o0, 2, %o0
- sll %g4, 16, %g4
- addcc %g4, %g7, %g7
- add %o1, 2, %o1
- srl %g7, 16, %g3
- addx %g0, %g3, %g4
- sll %g7, 16, %g7
- sll %g4, 16, %g3
- srl %g7, 16, %g7
- andcc %o0, 0x4, %g0
- or %g3, %g7, %g7
- 1: be 3f
- andcc %g1, 0xffffff80, %g0
- EX(ld [%o0 + 0x00], %g4, add %g1, 0,#)
- sub %g1, 4, %g1
- EX2(st %g4, [%o1 + 0x00],#)
- add %o0, 4, %o0
- addcc %g4, %g7, %g7
- add %o1, 4, %o1
- addx %g0, %g7, %g7
- b 3f
- andcc %g1, 0xffffff80, %g0
- /* Sun, you just can't beat me, you just can't. Stop trying,
- * give up. I'm serious, I am going to kick the living shit
- * out of you, game over, lights out.
- */
- .align 8
- .globl C_LABEL(__csum_partial_copy_sparc_generic)
- C_LABEL(__csum_partial_copy_sparc_generic):
- /* %o0=src, %o1=dest, %g1=len, %g7=sum */
- xor %o0, %o1, %o4 ! get changing bits
- andcc %o4, 3, %g0 ! check for mismatched alignment
- bne ccslow ! better this than unaligned/fixups
- andcc %o0, 7, %g0 ! need to align things?
- bne cc_dword_align ! yes, we check for short lengths there
- andcc %g1, 0xffffff80, %g0 ! can we use unrolled loop?
- 3: be 3f ! nope, less than one loop remains
- andcc %o1, 4, %g0 ! dest aligned on 4 or 8 byte boundry?
- be ccdbl + 4 ! 8 byte aligned, kick ass
- 5: CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- 10: EXT(5b, 10b, 20f,#) ! note for exception handling
- sub %g1, 128, %g1 ! detract from length
- addx %g0, %g7, %g7 ! add in last carry bit
- andcc %g1, 0xffffff80, %g0 ! more to csum?
- add %o0, 128, %o0 ! advance src ptr
- bne 5b ! we did not go negative, continue looping
- add %o1, 128, %o1 ! advance dest ptr
- 3: andcc %g1, 0x70, %o2 ! can use table?
- ccmerge:be ccte ! nope, go and check for end cruft
- andcc %g1, 0xf, %o3 ! get low bits of length (clears carry btw)
- srl %o2, 1, %o4 ! begin negative offset computation
- sethi %hi(12f), %o5 ! set up table ptr end
- add %o0, %o2, %o0 ! advance src ptr
- sub %o5, %o4, %o5 ! continue table calculation
- sll %o2, 1, %g2 ! constant multiplies are fun...
- sub %o5, %g2, %o5 ! some more adjustments
- jmp %o5 + %lo(12f) ! jump into it, duff style, wheee...
- add %o1, %o2, %o1 ! advance dest ptr (carry is clear btw)
- cctbl: CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x68,%g2,%g3,%g4,%g5)
- CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x58,%g2,%g3,%g4,%g5)
- CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x48,%g2,%g3,%g4,%g5)
- CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x38,%g2,%g3,%g4,%g5)
- CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x28,%g2,%g3,%g4,%g5)
- CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x18,%g2,%g3,%g4,%g5)
- CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x08,%g2,%g3,%g4,%g5)
- 12: EXT(cctbl, 12b, 22f,#) ! note for exception table handling
- addx %g0, %g7, %g7
- andcc %o3, 0xf, %g0 ! check for low bits set
- ccte: bne cc_end_cruft ! something left, handle it out of band
- andcc %o3, 8, %g0 ! begin checks for that code
- retl ! return
- mov %g7, %o0 ! give em the computed checksum
- ccdbl: CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
- 11: EXT(ccdbl, 11b, 21f,#) ! note for exception table handling
- sub %g1, 128, %g1 ! detract from length
- addx %g0, %g7, %g7 ! add in last carry bit
- andcc %g1, 0xffffff80, %g0 ! more to csum?
- add %o0, 128, %o0 ! advance src ptr
- bne ccdbl ! we did not go negative, continue looping
- add %o1, 128, %o1 ! advance dest ptr
- b ccmerge ! finish it off, above
- andcc %g1, 0x70, %o2 ! can use table? (clears carry btw)
- ccslow: cmp %g1, 0
- mov 0, %g5
- bleu 4f
- andcc %o0, 1, %o5
- be,a 1f
- srl %g1, 1, %g4
- sub %g1, 1, %g1
- EX(ldub [%o0], %g5, add %g1, 1,#)
- add %o0, 1, %o0
- EX2(stb %g5, [%o1],#)
- srl %g1, 1, %g4
- add %o1, 1, %o1
- 1: cmp %g4, 0
- be,a 3f
- andcc %g1, 1, %g0
- andcc %o0, 2, %g0
- be,a 1f
- srl %g4, 1, %g4
- EX(lduh [%o0], %o4, add %g1, 0,#)
- sub %g1, 2, %g1
- srl %o4, 8, %g2
- sub %g4, 1, %g4
- EX2(stb %g2, [%o1],#)
- add %o4, %g5, %g5
- EX2(stb %o4, [%o1 + 1],#)
- add %o0, 2, %o0
- srl %g4, 1, %g4
- add %o1, 2, %o1
- 1: cmp %g4, 0
- be,a 2f
- andcc %g1, 2, %g0
- EX3(ld [%o0], %o4,#)
- 5: srl %o4, 24, %g2
- srl %o4, 16, %g3
- EX2(stb %g2, [%o1],#)
- srl %o4, 8, %g2
- EX2(stb %g3, [%o1 + 1],#)
- add %o0, 4, %o0
- EX2(stb %g2, [%o1 + 2],#)
- addcc %o4, %g5, %g5
- EX2(stb %o4, [%o1 + 3],#)
- addx %g5, %g0, %g5 ! I am now to lazy to optimize this (question it
- add %o1, 4, %o1 ! is worthy). Maybe some day - with the sll/srl
- subcc %g4, 1, %g4 ! tricks
- bne,a 5b
- EX3(ld [%o0], %o4,#)
- sll %g5, 16, %g2
- srl %g5, 16, %g5
- srl %g2, 16, %g2
- andcc %g1, 2, %g0
- add %g2, %g5, %g5
- 2: be,a 3f
- andcc %g1, 1, %g0
- EX(lduh [%o0], %o4, and %g1, 3,#)
- andcc %g1, 1, %g0
- srl %o4, 8, %g2
- add %o0, 2, %o0
- EX2(stb %g2, [%o1],#)
- add %g5, %o4, %g5
- EX2(stb %o4, [%o1 + 1],#)
- add %o1, 2, %o1
- 3: be,a 1f
- sll %g5, 16, %o4
- EX(ldub [%o0], %g2, add %g0, 1,#)
- sll %g2, 8, %o4
- EX2(stb %g2, [%o1],#)
- add %g5, %o4, %g5
- sll %g5, 16, %o4
- 1: addcc %o4, %g5, %g5
- srl %g5, 16, %o4
- addx %g0, %o4, %g5
- orcc %o5, %g0, %g0
- be 4f
- srl %g5, 8, %o4
- and %g5, 0xff, %g2
- and %o4, 0xff, %o4
- sll %g2, 8, %g2
- or %g2, %o4, %g5
- 4: addcc %g7, %g5, %g7
- retl
- addx %g0, %g7, %o0
- C_LABEL(__csum_partial_copy_end):
- /* We do these strange calculations for the csum_*_from_user case only, ie.
- * we only bother with faults on loads... */
- /* o2 = ((g2%20)&3)*8
- * o3 = g1 - (g2/20)*32 - o2 */
- 20:
- cmp %g2, 20
- blu,a 1f
- and %g2, 3, %o2
- sub %g1, 32, %g1
- b 20b
- sub %g2, 20, %g2
- 1:
- sll %o2, 3, %o2
- b 31f
- sub %g1, %o2, %o3
- /* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8)
- * o3 = g1 - (g2/16)*32 - o2 */
- 21:
- andcc %g2, 15, %o3
- srl %g2, 4, %g2
- be,a 1f
- clr %o2
- add %o3, 1, %o3
- and %o3, 14, %o3
- sll %o3, 3, %o2
- 1:
- sll %g2, 5, %g2
- sub %g1, %g2, %o3
- b 31f
- sub %o3, %o2, %o3
- /* o0 += (g2/10)*16 - 0x70
- * 01 += (g2/10)*16 - 0x70
- * o2 = (g2 % 10) ? 8 : 0
- * o3 += 0x70 - (g2/10)*16 - o2 */
- 22:
- cmp %g2, 10
- blu,a 1f
- sub %o0, 0x70, %o0
- add %o0, 16, %o0
- add %o1, 16, %o1
- sub %o3, 16, %o3
- b 22b
- sub %g2, 10, %g2
- 1:
- sub %o1, 0x70, %o1
- add %o3, 0x70, %o3
- clr %o2
- tst %g2
- bne,a 1f
- mov 8, %o2
- 1:
- b 31f
- sub %o3, %o2, %o3
- 96:
- and %g1, 3, %g1
- sll %g4, 2, %g4
- add %g1, %g4, %o3
- 30:
- /* %o1 is dst
- * %o3 is # bytes to zero out
- * %o4 is faulting address
- * %o5 is %pc where fault occurred */
- clr %o2
- 31:
- /* %o0 is src
- * %o1 is dst
- * %o2 is # of bytes to copy from src to dst
- * %o3 is # bytes to zero out
- * %o4 is faulting address
- * %o5 is %pc where fault occurred */
- save %sp, -104, %sp
- mov %i5, %o0
- mov %i7, %o1
- mov %i4, %o2
- call C_LABEL(lookup_fault)
- mov %g7, %i4
- cmp %o0, 2
- bne 1f
- add %g0, -EFAULT, %i5
- tst %i2
- be 2f
- mov %i0, %o1
- mov %i1, %o0
- 5:
- call C_LABEL(__memcpy)
- mov %i2, %o2
- tst %o0
- bne,a 2f
- add %i3, %i2, %i3
- add %i1, %i2, %i1
- 2:
- mov %i1, %o0
- 6:
- call C_LABEL(__bzero)
- mov %i3, %o1
- 1:
- ld [%sp + 168], %o2 ! struct_ptr of parent
- st %i5, [%o2]
- ret
- restore
- .section __ex_table,#alloc
- .align 4
- .word 5b,2
- .word 6b,2