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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ae5de0ff0b
Both csum_partial() and the csum_partial_copy*() family of routines forget to do a final fold on the computed checksum value on sparc64. So do the standard Sparc "add + set condition codes, add carry" sequence, then make sure the high 32-bits of the return value are clear. Based upon some excellent detective work and debugging done by Richard Braun and Samuel Thibault. Signed-off-by: David S. Miller <davem@davemloft.net>
310 lines
6.9 KiB
ArmAsm
310 lines
6.9 KiB
ArmAsm
/* csum_copy.S: Checksum+copy code for sparc64
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*
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* Copyright (C) 2005 David S. Miller <davem@davemloft.net>
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*/
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#ifdef __KERNEL__
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#define GLOBAL_SPARE %g7
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#else
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#define GLOBAL_SPARE %g5
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#endif
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#ifndef EX_LD
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#define EX_LD(x) x
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#endif
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#ifndef EX_ST
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#define EX_ST(x) x
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#endif
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#ifndef EX_RETVAL
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#define EX_RETVAL(x) x
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#endif
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#ifndef LOAD
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#define LOAD(type,addr,dest) type [addr], dest
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#endif
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#ifndef STORE
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#define STORE(type,src,addr) type src, [addr]
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#endif
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#ifndef FUNC_NAME
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#define FUNC_NAME csum_partial_copy_nocheck
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#endif
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.register %g2, #scratch
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.register %g3, #scratch
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.text
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90:
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/* We checked for zero length already, so there must be
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* at least one byte.
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*/
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be,pt %icc, 1f
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nop
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EX_LD(LOAD(ldub, %o0 + 0x00, %o4))
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add %o0, 1, %o0
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sub %o2, 1, %o2
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EX_ST(STORE(stb, %o4, %o1 + 0x00))
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add %o1, 1, %o1
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1: andcc %o0, 0x2, %g0
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be,pn %icc, 80f
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cmp %o2, 2
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blu,pn %icc, 60f
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nop
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EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
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add %o0, 2, %o0
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sub %o2, 2, %o2
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EX_ST(STORE(sth, %o5, %o1 + 0x00))
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add %o1, 2, %o1
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ba,pt %xcc, 80f
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add %o5, %o4, %o4
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.globl FUNC_NAME
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FUNC_NAME: /* %o0=src, %o1=dst, %o2=len, %o3=sum */
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LOAD(prefetch, %o0 + 0x000, #n_reads)
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xor %o0, %o1, %g1
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clr %o4
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andcc %g1, 0x3, %g0
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bne,pn %icc, 95f
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LOAD(prefetch, %o0 + 0x040, #n_reads)
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brz,pn %o2, 70f
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andcc %o0, 0x3, %g0
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/* We "remember" whether the lowest bit in the address
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* was set in GLOBAL_SPARE. Because if it is, we have to swap
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* upper and lower 8 bit fields of the sum we calculate.
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*/
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bne,pn %icc, 90b
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andcc %o0, 0x1, GLOBAL_SPARE
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80:
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LOAD(prefetch, %o0 + 0x080, #n_reads)
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andncc %o2, 0x3f, %g3
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LOAD(prefetch, %o0 + 0x0c0, #n_reads)
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sub %o2, %g3, %o2
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brz,pn %g3, 2f
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LOAD(prefetch, %o0 + 0x100, #n_reads)
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/* So that we don't need to use the non-pairing
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* add-with-carry instructions we accumulate 32-bit
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* values into a 64-bit register. At the end of the
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* loop we fold it down to 32-bits and so on.
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*/
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ba,pt %xcc, 1f
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LOAD(prefetch, %o0 + 0x140, #n_reads)
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.align 32
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1: EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
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EX_LD(LOAD(lduw, %o0 + 0x04, %g1))
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EX_LD(LOAD(lduw, %o0 + 0x08, %g2))
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x00))
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EX_LD(LOAD(lduw, %o0 + 0x0c, %o5))
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add %o4, %g1, %o4
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EX_ST(STORE(stw, %g1, %o1 + 0x04))
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EX_LD(LOAD(lduw, %o0 + 0x10, %g1))
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add %o4, %g2, %o4
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EX_ST(STORE(stw, %g2, %o1 + 0x08))
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EX_LD(LOAD(lduw, %o0 + 0x14, %g2))
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x0c))
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EX_LD(LOAD(lduw, %o0 + 0x18, %o5))
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add %o4, %g1, %o4
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EX_ST(STORE(stw, %g1, %o1 + 0x10))
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EX_LD(LOAD(lduw, %o0 + 0x1c, %g1))
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add %o4, %g2, %o4
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EX_ST(STORE(stw, %g2, %o1 + 0x14))
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EX_LD(LOAD(lduw, %o0 + 0x20, %g2))
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x18))
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EX_LD(LOAD(lduw, %o0 + 0x24, %o5))
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add %o4, %g1, %o4
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EX_ST(STORE(stw, %g1, %o1 + 0x1c))
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EX_LD(LOAD(lduw, %o0 + 0x28, %g1))
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add %o4, %g2, %o4
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EX_ST(STORE(stw, %g2, %o1 + 0x20))
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EX_LD(LOAD(lduw, %o0 + 0x2c, %g2))
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x24))
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EX_LD(LOAD(lduw, %o0 + 0x30, %o5))
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add %o4, %g1, %o4
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EX_ST(STORE(stw, %g1, %o1 + 0x28))
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EX_LD(LOAD(lduw, %o0 + 0x34, %g1))
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add %o4, %g2, %o4
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EX_ST(STORE(stw, %g2, %o1 + 0x2c))
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EX_LD(LOAD(lduw, %o0 + 0x38, %g2))
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x30))
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EX_LD(LOAD(lduw, %o0 + 0x3c, %o5))
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add %o4, %g1, %o4
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EX_ST(STORE(stw, %g1, %o1 + 0x34))
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LOAD(prefetch, %o0 + 0x180, #n_reads)
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add %o4, %g2, %o4
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EX_ST(STORE(stw, %g2, %o1 + 0x38))
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subcc %g3, 0x40, %g3
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add %o0, 0x40, %o0
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x3c))
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bne,pt %icc, 1b
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add %o1, 0x40, %o1
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2: and %o2, 0x3c, %g3
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brz,pn %g3, 2f
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sub %o2, %g3, %o2
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1: EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
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subcc %g3, 0x4, %g3
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add %o0, 0x4, %o0
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add %o4, %o5, %o4
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EX_ST(STORE(stw, %o5, %o1 + 0x00))
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bne,pt %icc, 1b
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add %o1, 0x4, %o1
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2:
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/* fold 64-->32 */
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srlx %o4, 32, %o5
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srl %o4, 0, %o4
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add %o4, %o5, %o4
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srlx %o4, 32, %o5
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srl %o4, 0, %o4
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add %o4, %o5, %o4
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/* fold 32-->16 */
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sethi %hi(0xffff0000), %g1
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srl %o4, 16, %o5
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andn %o4, %g1, %g2
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add %o5, %g2, %o4
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srl %o4, 16, %o5
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andn %o4, %g1, %g2
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add %o5, %g2, %o4
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60:
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/* %o4 has the 16-bit sum we have calculated so-far. */
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cmp %o2, 2
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blu,pt %icc, 1f
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nop
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EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
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sub %o2, 2, %o2
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add %o0, 2, %o0
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add %o4, %o5, %o4
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EX_ST(STORE(sth, %o5, %o1 + 0x00))
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add %o1, 0x2, %o1
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1: brz,pt %o2, 1f
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nop
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EX_LD(LOAD(ldub, %o0 + 0x00, %o5))
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sub %o2, 1, %o2
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add %o0, 1, %o0
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EX_ST(STORE(stb, %o5, %o1 + 0x00))
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sllx %o5, 8, %o5
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add %o1, 1, %o1
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add %o4, %o5, %o4
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1:
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/* fold 32-->16 */
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sethi %hi(0xffff0000), %g1
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srl %o4, 16, %o5
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andn %o4, %g1, %g2
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add %o5, %g2, %o4
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srl %o4, 16, %o5
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andn %o4, %g1, %g2
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add %o5, %g2, %o4
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1: brz,pt GLOBAL_SPARE, 1f
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nop
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/* We started with an odd byte, byte-swap the result. */
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srl %o4, 8, %o5
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and %o4, 0xff, %g1
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sll %g1, 8, %g1
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or %o5, %g1, %o4
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1: addcc %o3, %o4, %o3
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addc %g0, %o3, %o3
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70:
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retl
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srl %o3, 0, %o0
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95: mov 0, GLOBAL_SPARE
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brlez,pn %o2, 4f
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andcc %o0, 1, %o5
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be,a,pt %icc, 1f
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srl %o2, 1, %g1
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sub %o2, 1, %o2
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EX_LD(LOAD(ldub, %o0, GLOBAL_SPARE))
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add %o0, 1, %o0
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EX_ST(STORE(stb, GLOBAL_SPARE, %o1))
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srl %o2, 1, %g1
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add %o1, 1, %o1
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1: brz,a,pn %g1, 3f
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andcc %o2, 1, %g0
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andcc %o0, 2, %g0
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be,a,pt %icc, 1f
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srl %g1, 1, %g1
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EX_LD(LOAD(lduh, %o0, %o4))
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sub %o2, 2, %o2
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srl %o4, 8, %g2
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sub %g1, 1, %g1
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EX_ST(STORE(stb, %g2, %o1))
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add %o4, GLOBAL_SPARE, GLOBAL_SPARE
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EX_ST(STORE(stb, %o4, %o1 + 1))
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add %o0, 2, %o0
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srl %g1, 1, %g1
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add %o1, 2, %o1
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1: brz,a,pn %g1, 2f
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andcc %o2, 2, %g0
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EX_LD(LOAD(lduw, %o0, %o4))
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5: srl %o4, 24, %g2
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srl %o4, 16, %g3
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EX_ST(STORE(stb, %g2, %o1))
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srl %o4, 8, %g2
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EX_ST(STORE(stb, %g3, %o1 + 1))
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add %o0, 4, %o0
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EX_ST(STORE(stb, %g2, %o1 + 2))
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addcc %o4, GLOBAL_SPARE, GLOBAL_SPARE
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EX_ST(STORE(stb, %o4, %o1 + 3))
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addc GLOBAL_SPARE, %g0, GLOBAL_SPARE
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add %o1, 4, %o1
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subcc %g1, 1, %g1
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bne,a,pt %icc, 5b
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EX_LD(LOAD(lduw, %o0, %o4))
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sll GLOBAL_SPARE, 16, %g2
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srl GLOBAL_SPARE, 16, GLOBAL_SPARE
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srl %g2, 16, %g2
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andcc %o2, 2, %g0
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add %g2, GLOBAL_SPARE, GLOBAL_SPARE
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2: be,a,pt %icc, 3f
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andcc %o2, 1, %g0
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EX_LD(LOAD(lduh, %o0, %o4))
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andcc %o2, 1, %g0
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srl %o4, 8, %g2
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add %o0, 2, %o0
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EX_ST(STORE(stb, %g2, %o1))
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add GLOBAL_SPARE, %o4, GLOBAL_SPARE
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EX_ST(STORE(stb, %o4, %o1 + 1))
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add %o1, 2, %o1
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3: be,a,pt %icc, 1f
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sll GLOBAL_SPARE, 16, %o4
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EX_LD(LOAD(ldub, %o0, %g2))
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sll %g2, 8, %o4
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EX_ST(STORE(stb, %g2, %o1))
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add GLOBAL_SPARE, %o4, GLOBAL_SPARE
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sll GLOBAL_SPARE, 16, %o4
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1: addcc %o4, GLOBAL_SPARE, GLOBAL_SPARE
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srl GLOBAL_SPARE, 16, %o4
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addc %g0, %o4, GLOBAL_SPARE
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brz,pt %o5, 4f
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srl GLOBAL_SPARE, 8, %o4
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and GLOBAL_SPARE, 0xff, %g2
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and %o4, 0xff, %o4
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sll %g2, 8, %g2
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or %g2, %o4, GLOBAL_SPARE
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4: addcc %o3, GLOBAL_SPARE, %o3
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addc %g0, %o3, %o0
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retl
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srl %o0, 0, %o0
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.size FUNC_NAME, .-FUNC_NAME
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