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xianfeng |
/* checksum.S: Sparc optimized checksum code.
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*
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* Copyright(C) 1995 Linus Torvalds
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* Copyright(C) 1995 Miguel de Icaza
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* Copyright(C) 1996 David S. Miller
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* Copyright(C) 1997 Jakub Jelinek
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*
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* derived from:
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* Linux/Alpha checksum c-code
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* Linux/ix86 inline checksum assembly
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* RFC1071 Computing the Internet Checksum (esp. Jacobsons m68k code)
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* David Mosberger-Tang for optimized reference c-code
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* BSD4.4 portable checksum routine
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*/
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#include
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#define CSUM_BIGCHUNK(buf, offset, sum, t0, t1, t2, t3, t4, t5) \
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ldd [buf + offset + 0x00], t0; \
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ldd [buf + offset + 0x08], t2; \
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addxcc t0, sum, sum; \
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addxcc t1, sum, sum; \
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ldd [buf + offset + 0x10], t4; \
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addxcc t2, sum, sum; \
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addxcc t3, sum, sum; \
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ldd [buf + offset + 0x18], t0; \
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addxcc t4, sum, sum; \
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addxcc t5, sum, sum; \
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addxcc t0, sum, sum; \
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addxcc t1, sum, sum;
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#define CSUM_LASTCHUNK(buf, offset, sum, t0, t1, t2, t3) \
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ldd [buf - offset - 0x08], t0; \
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ldd [buf - offset - 0x00], t2; \
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addxcc t0, sum, sum; \
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addxcc t1, sum, sum; \
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addxcc t2, sum, sum; \
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addxcc t3, sum, sum;
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/* Do end cruft out of band to get better cache patterns. */
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csum_partial_end_cruft:
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be 1f ! caller asks %o1 & 0x8
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andcc %o1, 4, %g0 ! nope, check for word remaining
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ldd [%o0], %g2 ! load two
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addcc %g2, %o2, %o2 ! add first word to sum
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addxcc %g3, %o2, %o2 ! add second word as well
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add %o0, 8, %o0 ! advance buf ptr
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addx %g0, %o2, %o2 ! add in final carry
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andcc %o1, 4, %g0 ! check again for word remaining
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1: be 1f ! nope, skip this code
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andcc %o1, 3, %o1 ! check for trailing bytes
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ld [%o0], %g2 ! load it
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addcc %g2, %o2, %o2 ! add to sum
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add %o0, 4, %o0 ! advance buf ptr
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addx %g0, %o2, %o2 ! add in final carry
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andcc %o1, 3, %g0 ! check again for trailing bytes
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1: be 1f ! no trailing bytes, return
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addcc %o1, -1, %g0 ! only one byte remains?
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bne 2f ! at least two bytes more
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subcc %o1, 2, %o1 ! only two bytes more?
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b 4f ! only one byte remains
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or %g0, %g0, %o4 ! clear fake hword value
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2: lduh [%o0], %o4 ! get hword
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be 6f ! jmp if only hword remains
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add %o0, 2, %o0 ! advance buf ptr either way
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sll %o4, 16, %o4 ! create upper hword
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4: ldub [%o0], %o5 ! get final byte
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sll %o5, 8, %o5 ! put into place
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or %o5, %o4, %o4 ! coalese with hword (if any)
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6: addcc %o4, %o2, %o2 ! add to sum
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1: retl ! get outta here
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addx %g0, %o2, %o0 ! add final carry into retval
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/* Also do alignment out of band to get better cache patterns. */
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csum_partial_fix_alignment:
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cmp %o1, 6
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bl cpte - 0x4
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andcc %o0, 0x2, %g0
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be 1f
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andcc %o0, 0x4, %g0
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lduh [%o0 + 0x00], %g2
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sub %o1, 2, %o1
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add %o0, 2, %o0
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sll %g2, 16, %g2
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addcc %g2, %o2, %o2
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srl %o2, 16, %g3
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addx %g0, %g3, %g2
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sll %o2, 16, %o2
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sll %g2, 16, %g3
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srl %o2, 16, %o2
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andcc %o0, 0x4, %g0
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or %g3, %o2, %o2
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1: be cpa
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andcc %o1, 0xffffff80, %o3
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ld [%o0 + 0x00], %g2
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sub %o1, 4, %o1
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addcc %g2, %o2, %o2
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add %o0, 4, %o0
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addx %g0, %o2, %o2
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b cpa
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andcc %o1, 0xffffff80, %o3
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/* The common case is to get called with a nicely aligned
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* buffer of size 0x20. Follow the code path for that case.
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*/
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.globl csum_partial
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csum_partial: /* %o0=buf, %o1=len, %o2=sum */
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andcc %o0, 0x7, %g0 ! alignment problems?
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bne csum_partial_fix_alignment ! yep, handle it
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sethi %hi(cpte - 8), %g7 ! prepare table jmp ptr
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andcc %o1, 0xffffff80, %o3 ! num loop iterations
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cpa: be 3f ! none to do
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andcc %o1, 0x70, %g1 ! clears carry flag too
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5: CSUM_BIGCHUNK(%o0, 0x00, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
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CSUM_BIGCHUNK(%o0, 0x20, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
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CSUM_BIGCHUNK(%o0, 0x40, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
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CSUM_BIGCHUNK(%o0, 0x60, %o2, %o4, %o5, %g2, %g3, %g4, %g5)
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addx %g0, %o2, %o2 ! sink in final carry
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subcc %o3, 128, %o3 ! detract from loop iters
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bne 5b ! more to do
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add %o0, 128, %o0 ! advance buf ptr
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andcc %o1, 0x70, %g1 ! clears carry flag too
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3: be cpte ! nope
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andcc %o1, 0xf, %g0 ! anything left at all?
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srl %g1, 1, %o4 ! compute offset
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sub %g7, %g1, %g7 ! adjust jmp ptr
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sub %g7, %o4, %g7 ! final jmp ptr adjust
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jmp %g7 + %lo(cpte - 8) ! enter the table
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add %o0, %g1, %o0 ! advance buf ptr
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cptbl: CSUM_LASTCHUNK(%o0, 0x68, %o2, %g2, %g3, %g4, %g5)
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CSUM_LASTCHUNK(%o0, 0x58, %o2, %g2, %g3, %g4, %g5)
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CSUM_LASTCHUNK(%o0, 0x48, %o2, %g2, %g3, %g4, %g5)
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CSUM_LASTCHUNK(%o0, 0x38, %o2, %g2, %g3, %g4, %g5)
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CSUM_LASTCHUNK(%o0, 0x28, %o2, %g2, %g3, %g4, %g5)
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CSUM_LASTCHUNK(%o0, 0x18, %o2, %g2, %g3, %g4, %g5)
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CSUM_LASTCHUNK(%o0, 0x08, %o2, %g2, %g3, %g4, %g5)
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addx %g0, %o2, %o2 ! fetch final carry
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andcc %o1, 0xf, %g0 ! anything left at all?
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cpte: bne csum_partial_end_cruft ! yep, handle it
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andcc %o1, 8, %g0 ! check how much
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cpout: retl ! get outta here
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mov %o2, %o0 ! return computed csum
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.globl __csum_partial_copy_start, __csum_partial_copy_end
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__csum_partial_copy_start:
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/* Work around cpp -rob */
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#define ALLOC #alloc
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#define EXECINSTR #execinstr
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#define EX(x,y,a,b) \
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98: x,y; \
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.section .fixup,ALLOC,EXECINSTR; \
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.align 4; \
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99: ba 30f; \
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a, b, %o3; \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word 98b, 99b; \
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.text; \
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.align 4
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162 |
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#define EX2(x,y) \
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98: x,y; \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word 98b, 30f; \
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.text; \
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168 |
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.align 4
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170 |
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#define EX3(x,y) \
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98: x,y; \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word 98b, 96f; \
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.text; \
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.align 4
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178 |
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#define EXT(start,end,handler) \
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.section __ex_table,ALLOC; \
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180 |
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.align 4; \
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181 |
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.word start, 0, end, handler; \
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182 |
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.text; \
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183 |
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.align 4
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184 |
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185 |
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/* This aligned version executes typically in 8.5 superscalar cycles, this
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186 |
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* is the best I can do. I say 8.5 because the final add will pair with
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* the next ldd in the main unrolled loop. Thus the pipe is always full.
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188 |
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* If you change these macros (including order of instructions),
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189 |
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* please check the fixup code below as well.
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190 |
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*/
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191 |
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#define CSUMCOPY_BIGCHUNK_ALIGNED(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7) \
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192 |
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ldd [src + off + 0x00], t0; \
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ldd [src + off + 0x08], t2; \
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194 |
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addxcc t0, sum, sum; \
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ldd [src + off + 0x10], t4; \
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196 |
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addxcc t1, sum, sum; \
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197 |
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ldd [src + off + 0x18], t6; \
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198 |
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addxcc t2, sum, sum; \
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199 |
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std t0, [dst + off + 0x00]; \
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200 |
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addxcc t3, sum, sum; \
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201 |
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std t2, [dst + off + 0x08]; \
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202 |
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addxcc t4, sum, sum; \
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203 |
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std t4, [dst + off + 0x10]; \
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204 |
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addxcc t5, sum, sum; \
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205 |
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std t6, [dst + off + 0x18]; \
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206 |
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addxcc t6, sum, sum; \
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207 |
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addxcc t7, sum, sum;
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208 |
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209 |
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/* 12 superscalar cycles seems to be the limit for this case,
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210 |
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* because of this we thus do all the ldd's together to get
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211 |
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* Viking MXCC into streaming mode. Ho hum...
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212 |
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*/
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213 |
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#define CSUMCOPY_BIGCHUNK(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7) \
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ldd [src + off + 0x00], t0; \
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215 |
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ldd [src + off + 0x08], t2; \
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216 |
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ldd [src + off + 0x10], t4; \
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217 |
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ldd [src + off + 0x18], t6; \
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218 |
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st t0, [dst + off + 0x00]; \
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219 |
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addxcc t0, sum, sum; \
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220 |
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st t1, [dst + off + 0x04]; \
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221 |
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addxcc t1, sum, sum; \
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222 |
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st t2, [dst + off + 0x08]; \
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223 |
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addxcc t2, sum, sum; \
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224 |
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st t3, [dst + off + 0x0c]; \
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225 |
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addxcc t3, sum, sum; \
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226 |
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st t4, [dst + off + 0x10]; \
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227 |
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addxcc t4, sum, sum; \
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228 |
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st t5, [dst + off + 0x14]; \
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229 |
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addxcc t5, sum, sum; \
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230 |
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st t6, [dst + off + 0x18]; \
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231 |
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addxcc t6, sum, sum; \
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232 |
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st t7, [dst + off + 0x1c]; \
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233 |
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addxcc t7, sum, sum;
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234 |
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|
235 |
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/* Yuck, 6 superscalar cycles... */
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236 |
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#define CSUMCOPY_LASTCHUNK(src, dst, sum, off, t0, t1, t2, t3) \
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237 |
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ldd [src - off - 0x08], t0; \
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238 |
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ldd [src - off - 0x00], t2; \
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239 |
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addxcc t0, sum, sum; \
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240 |
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st t0, [dst - off - 0x08]; \
|
241 |
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addxcc t1, sum, sum; \
|
242 |
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st t1, [dst - off - 0x04]; \
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243 |
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addxcc t2, sum, sum; \
|
244 |
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st t2, [dst - off - 0x00]; \
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245 |
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addxcc t3, sum, sum; \
|
246 |
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st t3, [dst - off + 0x04];
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247 |
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|
248 |
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/* Handle the end cruft code out of band for better cache patterns. */
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249 |
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cc_end_cruft:
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250 |
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be 1f
|
251 |
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andcc %o3, 4, %g0
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252 |
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EX(ldd [%o0 + 0x00], %g2, and %o3, 0xf)
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253 |
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add %o1, 8, %o1
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254 |
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addcc %g2, %g7, %g7
|
255 |
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add %o0, 8, %o0
|
256 |
|
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addxcc %g3, %g7, %g7
|
257 |
|
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EX2(st %g2, [%o1 - 0x08])
|
258 |
|
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addx %g0, %g7, %g7
|
259 |
|
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andcc %o3, 4, %g0
|
260 |
|
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EX2(st %g3, [%o1 - 0x04])
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261 |
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1: be 1f
|
262 |
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andcc %o3, 3, %o3
|
263 |
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EX(ld [%o0 + 0x00], %g2, add %o3, 4)
|
264 |
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add %o1, 4, %o1
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265 |
|
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addcc %g2, %g7, %g7
|
266 |
|
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EX2(st %g2, [%o1 - 0x04])
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267 |
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addx %g0, %g7, %g7
|
268 |
|
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andcc %o3, 3, %g0
|
269 |
|
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add %o0, 4, %o0
|
270 |
|
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1: be 1f
|
271 |
|
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addcc %o3, -1, %g0
|
272 |
|
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bne 2f
|
273 |
|
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subcc %o3, 2, %o3
|
274 |
|
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b 4f
|
275 |
|
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or %g0, %g0, %o4
|
276 |
|
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2: EX(lduh [%o0 + 0x00], %o4, add %o3, 2)
|
277 |
|
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add %o0, 2, %o0
|
278 |
|
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EX2(sth %o4, [%o1 + 0x00])
|
279 |
|
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be 6f
|
280 |
|
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add %o1, 2, %o1
|
281 |
|
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sll %o4, 16, %o4
|
282 |
|
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4: EX(ldub [%o0 + 0x00], %o5, add %g0, 1)
|
283 |
|
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EX2(stb %o5, [%o1 + 0x00])
|
284 |
|
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sll %o5, 8, %o5
|
285 |
|
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or %o5, %o4, %o4
|
286 |
|
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6: addcc %o4, %g7, %g7
|
287 |
|
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1: retl
|
288 |
|
|
addx %g0, %g7, %o0
|
289 |
|
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|
290 |
|
|
/* Also, handle the alignment code out of band. */
|
291 |
|
|
cc_dword_align:
|
292 |
|
|
cmp %g1, 6
|
293 |
|
|
bl,a ccte
|
294 |
|
|
andcc %g1, 0xf, %o3
|
295 |
|
|
andcc %o0, 0x1, %g0
|
296 |
|
|
bne ccslow
|
297 |
|
|
andcc %o0, 0x2, %g0
|
298 |
|
|
be 1f
|
299 |
|
|
andcc %o0, 0x4, %g0
|
300 |
|
|
EX(lduh [%o0 + 0x00], %g4, add %g1, 0)
|
301 |
|
|
sub %g1, 2, %g1
|
302 |
|
|
EX2(sth %g4, [%o1 + 0x00])
|
303 |
|
|
add %o0, 2, %o0
|
304 |
|
|
sll %g4, 16, %g4
|
305 |
|
|
addcc %g4, %g7, %g7
|
306 |
|
|
add %o1, 2, %o1
|
307 |
|
|
srl %g7, 16, %g3
|
308 |
|
|
addx %g0, %g3, %g4
|
309 |
|
|
sll %g7, 16, %g7
|
310 |
|
|
sll %g4, 16, %g3
|
311 |
|
|
srl %g7, 16, %g7
|
312 |
|
|
andcc %o0, 0x4, %g0
|
313 |
|
|
or %g3, %g7, %g7
|
314 |
|
|
1: be 3f
|
315 |
|
|
andcc %g1, 0xffffff80, %g0
|
316 |
|
|
EX(ld [%o0 + 0x00], %g4, add %g1, 0)
|
317 |
|
|
sub %g1, 4, %g1
|
318 |
|
|
EX2(st %g4, [%o1 + 0x00])
|
319 |
|
|
add %o0, 4, %o0
|
320 |
|
|
addcc %g4, %g7, %g7
|
321 |
|
|
add %o1, 4, %o1
|
322 |
|
|
addx %g0, %g7, %g7
|
323 |
|
|
b 3f
|
324 |
|
|
andcc %g1, 0xffffff80, %g0
|
325 |
|
|
|
326 |
|
|
/* Sun, you just can't beat me, you just can't. Stop trying,
|
327 |
|
|
* give up. I'm serious, I am going to kick the living shit
|
328 |
|
|
* out of you, game over, lights out.
|
329 |
|
|
*/
|
330 |
|
|
.align 8
|
331 |
|
|
.globl __csum_partial_copy_sparc_generic
|
332 |
|
|
__csum_partial_copy_sparc_generic:
|
333 |
|
|
/* %o0=src, %o1=dest, %g1=len, %g7=sum */
|
334 |
|
|
xor %o0, %o1, %o4 ! get changing bits
|
335 |
|
|
andcc %o4, 3, %g0 ! check for mismatched alignment
|
336 |
|
|
bne ccslow ! better this than unaligned/fixups
|
337 |
|
|
andcc %o0, 7, %g0 ! need to align things?
|
338 |
|
|
bne cc_dword_align ! yes, we check for short lengths there
|
339 |
|
|
andcc %g1, 0xffffff80, %g0 ! can we use unrolled loop?
|
340 |
|
|
3: be 3f ! nope, less than one loop remains
|
341 |
|
|
andcc %o1, 4, %g0 ! dest aligned on 4 or 8 byte boundary?
|
342 |
|
|
be ccdbl + 4 ! 8 byte aligned, kick ass
|
343 |
|
|
5: CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
344 |
|
|
CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
345 |
|
|
CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
346 |
|
|
CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
347 |
|
|
10: EXT(5b, 10b, 20f) ! note for exception handling
|
348 |
|
|
sub %g1, 128, %g1 ! detract from length
|
349 |
|
|
addx %g0, %g7, %g7 ! add in last carry bit
|
350 |
|
|
andcc %g1, 0xffffff80, %g0 ! more to csum?
|
351 |
|
|
add %o0, 128, %o0 ! advance src ptr
|
352 |
|
|
bne 5b ! we did not go negative, continue looping
|
353 |
|
|
add %o1, 128, %o1 ! advance dest ptr
|
354 |
|
|
3: andcc %g1, 0x70, %o2 ! can use table?
|
355 |
|
|
ccmerge:be ccte ! nope, go and check for end cruft
|
356 |
|
|
andcc %g1, 0xf, %o3 ! get low bits of length (clears carry btw)
|
357 |
|
|
srl %o2, 1, %o4 ! begin negative offset computation
|
358 |
|
|
sethi %hi(12f), %o5 ! set up table ptr end
|
359 |
|
|
add %o0, %o2, %o0 ! advance src ptr
|
360 |
|
|
sub %o5, %o4, %o5 ! continue table calculation
|
361 |
|
|
sll %o2, 1, %g2 ! constant multiplies are fun...
|
362 |
|
|
sub %o5, %g2, %o5 ! some more adjustments
|
363 |
|
|
jmp %o5 + %lo(12f) ! jump into it, duff style, wheee...
|
364 |
|
|
add %o1, %o2, %o1 ! advance dest ptr (carry is clear btw)
|
365 |
|
|
cctbl: CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x68,%g2,%g3,%g4,%g5)
|
366 |
|
|
CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x58,%g2,%g3,%g4,%g5)
|
367 |
|
|
CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x48,%g2,%g3,%g4,%g5)
|
368 |
|
|
CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x38,%g2,%g3,%g4,%g5)
|
369 |
|
|
CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x28,%g2,%g3,%g4,%g5)
|
370 |
|
|
CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x18,%g2,%g3,%g4,%g5)
|
371 |
|
|
CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x08,%g2,%g3,%g4,%g5)
|
372 |
|
|
12: EXT(cctbl, 12b, 22f) ! note for exception table handling
|
373 |
|
|
addx %g0, %g7, %g7
|
374 |
|
|
andcc %o3, 0xf, %g0 ! check for low bits set
|
375 |
|
|
ccte: bne cc_end_cruft ! something left, handle it out of band
|
376 |
|
|
andcc %o3, 8, %g0 ! begin checks for that code
|
377 |
|
|
retl ! return
|
378 |
|
|
mov %g7, %o0 ! give em the computed checksum
|
379 |
|
|
ccdbl: CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
380 |
|
|
CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
381 |
|
|
CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
382 |
|
|
CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
|
383 |
|
|
11: EXT(ccdbl, 11b, 21f) ! note for exception table handling
|
384 |
|
|
sub %g1, 128, %g1 ! detract from length
|
385 |
|
|
addx %g0, %g7, %g7 ! add in last carry bit
|
386 |
|
|
andcc %g1, 0xffffff80, %g0 ! more to csum?
|
387 |
|
|
add %o0, 128, %o0 ! advance src ptr
|
388 |
|
|
bne ccdbl ! we did not go negative, continue looping
|
389 |
|
|
add %o1, 128, %o1 ! advance dest ptr
|
390 |
|
|
b ccmerge ! finish it off, above
|
391 |
|
|
andcc %g1, 0x70, %o2 ! can use table? (clears carry btw)
|
392 |
|
|
|
393 |
|
|
ccslow: cmp %g1, 0
|
394 |
|
|
mov 0, %g5
|
395 |
|
|
bleu 4f
|
396 |
|
|
andcc %o0, 1, %o5
|
397 |
|
|
be,a 1f
|
398 |
|
|
srl %g1, 1, %g4
|
399 |
|
|
sub %g1, 1, %g1
|
400 |
|
|
EX(ldub [%o0], %g5, add %g1, 1)
|
401 |
|
|
add %o0, 1, %o0
|
402 |
|
|
EX2(stb %g5, [%o1])
|
403 |
|
|
srl %g1, 1, %g4
|
404 |
|
|
add %o1, 1, %o1
|
405 |
|
|
1: cmp %g4, 0
|
406 |
|
|
be,a 3f
|
407 |
|
|
andcc %g1, 1, %g0
|
408 |
|
|
andcc %o0, 2, %g0
|
409 |
|
|
be,a 1f
|
410 |
|
|
srl %g4, 1, %g4
|
411 |
|
|
EX(lduh [%o0], %o4, add %g1, 0)
|
412 |
|
|
sub %g1, 2, %g1
|
413 |
|
|
srl %o4, 8, %g2
|
414 |
|
|
sub %g4, 1, %g4
|
415 |
|
|
EX2(stb %g2, [%o1])
|
416 |
|
|
add %o4, %g5, %g5
|
417 |
|
|
EX2(stb %o4, [%o1 + 1])
|
418 |
|
|
add %o0, 2, %o0
|
419 |
|
|
srl %g4, 1, %g4
|
420 |
|
|
add %o1, 2, %o1
|
421 |
|
|
1: cmp %g4, 0
|
422 |
|
|
be,a 2f
|
423 |
|
|
andcc %g1, 2, %g0
|
424 |
|
|
EX3(ld [%o0], %o4)
|
425 |
|
|
5: srl %o4, 24, %g2
|
426 |
|
|
srl %o4, 16, %g3
|
427 |
|
|
EX2(stb %g2, [%o1])
|
428 |
|
|
srl %o4, 8, %g2
|
429 |
|
|
EX2(stb %g3, [%o1 + 1])
|
430 |
|
|
add %o0, 4, %o0
|
431 |
|
|
EX2(stb %g2, [%o1 + 2])
|
432 |
|
|
addcc %o4, %g5, %g5
|
433 |
|
|
EX2(stb %o4, [%o1 + 3])
|
434 |
|
|
addx %g5, %g0, %g5 ! I am now to lazy to optimize this (question it
|
435 |
|
|
add %o1, 4, %o1 ! is worthy). Maybe some day - with the sll/srl
|
436 |
|
|
subcc %g4, 1, %g4 ! tricks
|
437 |
|
|
bne,a 5b
|
438 |
|
|
EX3(ld [%o0], %o4)
|
439 |
|
|
sll %g5, 16, %g2
|
440 |
|
|
srl %g5, 16, %g5
|
441 |
|
|
srl %g2, 16, %g2
|
442 |
|
|
andcc %g1, 2, %g0
|
443 |
|
|
add %g2, %g5, %g5
|
444 |
|
|
2: be,a 3f
|
445 |
|
|
andcc %g1, 1, %g0
|
446 |
|
|
EX(lduh [%o0], %o4, and %g1, 3)
|
447 |
|
|
andcc %g1, 1, %g0
|
448 |
|
|
srl %o4, 8, %g2
|
449 |
|
|
add %o0, 2, %o0
|
450 |
|
|
EX2(stb %g2, [%o1])
|
451 |
|
|
add %g5, %o4, %g5
|
452 |
|
|
EX2(stb %o4, [%o1 + 1])
|
453 |
|
|
add %o1, 2, %o1
|
454 |
|
|
3: be,a 1f
|
455 |
|
|
sll %g5, 16, %o4
|
456 |
|
|
EX(ldub [%o0], %g2, add %g0, 1)
|
457 |
|
|
sll %g2, 8, %o4
|
458 |
|
|
EX2(stb %g2, [%o1])
|
459 |
|
|
add %g5, %o4, %g5
|
460 |
|
|
sll %g5, 16, %o4
|
461 |
|
|
1: addcc %o4, %g5, %g5
|
462 |
|
|
srl %g5, 16, %o4
|
463 |
|
|
addx %g0, %o4, %g5
|
464 |
|
|
orcc %o5, %g0, %g0
|
465 |
|
|
be 4f
|
466 |
|
|
srl %g5, 8, %o4
|
467 |
|
|
and %g5, 0xff, %g2
|
468 |
|
|
and %o4, 0xff, %o4
|
469 |
|
|
sll %g2, 8, %g2
|
470 |
|
|
or %g2, %o4, %g5
|
471 |
|
|
4: addcc %g7, %g5, %g7
|
472 |
|
|
retl
|
473 |
|
|
addx %g0, %g7, %o0
|
474 |
|
|
__csum_partial_copy_end:
|
475 |
|
|
|
476 |
|
|
/* We do these strange calculations for the csum_*_from_user case only, ie.
|
477 |
|
|
* we only bother with faults on loads... */
|
478 |
|
|
|
479 |
|
|
/* o2 = ((g2%20)&3)*8
|
480 |
|
|
* o3 = g1 - (g2/20)*32 - o2 */
|
481 |
|
|
20:
|
482 |
|
|
cmp %g2, 20
|
483 |
|
|
blu,a 1f
|
484 |
|
|
and %g2, 3, %o2
|
485 |
|
|
sub %g1, 32, %g1
|
486 |
|
|
b 20b
|
487 |
|
|
sub %g2, 20, %g2
|
488 |
|
|
1:
|
489 |
|
|
sll %o2, 3, %o2
|
490 |
|
|
b 31f
|
491 |
|
|
sub %g1, %o2, %o3
|
492 |
|
|
|
493 |
|
|
/* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8)
|
494 |
|
|
* o3 = g1 - (g2/16)*32 - o2 */
|
495 |
|
|
21:
|
496 |
|
|
andcc %g2, 15, %o3
|
497 |
|
|
srl %g2, 4, %g2
|
498 |
|
|
be,a 1f
|
499 |
|
|
clr %o2
|
500 |
|
|
add %o3, 1, %o3
|
501 |
|
|
and %o3, 14, %o3
|
502 |
|
|
sll %o3, 3, %o2
|
503 |
|
|
1:
|
504 |
|
|
sll %g2, 5, %g2
|
505 |
|
|
sub %g1, %g2, %o3
|
506 |
|
|
b 31f
|
507 |
|
|
sub %o3, %o2, %o3
|
508 |
|
|
|
509 |
|
|
/* o0 += (g2/10)*16 - 0x70
|
510 |
|
|
* 01 += (g2/10)*16 - 0x70
|
511 |
|
|
* o2 = (g2 % 10) ? 8 : 0
|
512 |
|
|
* o3 += 0x70 - (g2/10)*16 - o2 */
|
513 |
|
|
22:
|
514 |
|
|
cmp %g2, 10
|
515 |
|
|
blu,a 1f
|
516 |
|
|
sub %o0, 0x70, %o0
|
517 |
|
|
add %o0, 16, %o0
|
518 |
|
|
add %o1, 16, %o1
|
519 |
|
|
sub %o3, 16, %o3
|
520 |
|
|
b 22b
|
521 |
|
|
sub %g2, 10, %g2
|
522 |
|
|
1:
|
523 |
|
|
sub %o1, 0x70, %o1
|
524 |
|
|
add %o3, 0x70, %o3
|
525 |
|
|
clr %o2
|
526 |
|
|
tst %g2
|
527 |
|
|
bne,a 1f
|
528 |
|
|
mov 8, %o2
|
529 |
|
|
1:
|
530 |
|
|
b 31f
|
531 |
|
|
sub %o3, %o2, %o3
|
532 |
|
|
96:
|
533 |
|
|
and %g1, 3, %g1
|
534 |
|
|
sll %g4, 2, %g4
|
535 |
|
|
add %g1, %g4, %o3
|
536 |
|
|
30:
|
537 |
|
|
/* %o1 is dst
|
538 |
|
|
* %o3 is # bytes to zero out
|
539 |
|
|
* %o4 is faulting address
|
540 |
|
|
* %o5 is %pc where fault occurred */
|
541 |
|
|
clr %o2
|
542 |
|
|
31:
|
543 |
|
|
/* %o0 is src
|
544 |
|
|
* %o1 is dst
|
545 |
|
|
* %o2 is # of bytes to copy from src to dst
|
546 |
|
|
* %o3 is # bytes to zero out
|
547 |
|
|
* %o4 is faulting address
|
548 |
|
|
* %o5 is %pc where fault occurred */
|
549 |
|
|
save %sp, -104, %sp
|
550 |
|
|
mov %i5, %o0
|
551 |
|
|
mov %i7, %o1
|
552 |
|
|
mov %i4, %o2
|
553 |
|
|
call lookup_fault
|
554 |
|
|
mov %g7, %i4
|
555 |
|
|
cmp %o0, 2
|
556 |
|
|
bne 1f
|
557 |
|
|
add %g0, -EFAULT, %i5
|
558 |
|
|
tst %i2
|
559 |
|
|
be 2f
|
560 |
|
|
mov %i0, %o1
|
561 |
|
|
mov %i1, %o0
|
562 |
|
|
5:
|
563 |
|
|
call __memcpy
|
564 |
|
|
mov %i2, %o2
|
565 |
|
|
tst %o0
|
566 |
|
|
bne,a 2f
|
567 |
|
|
add %i3, %i2, %i3
|
568 |
|
|
add %i1, %i2, %i1
|
569 |
|
|
2:
|
570 |
|
|
mov %i1, %o0
|
571 |
|
|
6:
|
572 |
|
|
call __bzero
|
573 |
|
|
mov %i3, %o1
|
574 |
|
|
1:
|
575 |
|
|
ld [%sp + 168], %o2 ! struct_ptr of parent
|
576 |
|
|
st %i5, [%o2]
|
577 |
|
|
ret
|
578 |
|
|
restore
|
579 |
|
|
|
580 |
|
|
.section __ex_table,#alloc
|
581 |
|
|
.align 4
|
582 |
|
|
.word 5b,2
|
583 |
|
|
.word 6b,2
|