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[S390] broken copy_in_user function.
The copy_in_user primitive does not work as advertised. If the source and target area are available copy_in_user copies one byte too much. If one of the memory areas is not available it does not copy as much data as it can, but up to 257 bytes less. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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dc709bd190
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2 changed files with 36 additions and 34 deletions
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@ -88,30 +88,31 @@ __copy_to_user_asm:
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.globl __copy_in_user_asm
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# %r2 = from, %r3 = n, %r4 = to
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__copy_in_user_asm:
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ahi %r3,-1
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jo 6f
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sacf 256
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bras 1,1f
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mvc 0(1,%r4),0(%r2)
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0: mvc 0(256,%r4),0(%r2)
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la %r2,256(%r2)
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la %r4,256(%r4)
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1: ahi %r3,-256
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jnm 0b
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2: ex %r3,0(%r1)
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sacf 0
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slr %r2,%r2
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br 14
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3: mvc 0(1,%r4),0(%r2)
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bras %r1,4f
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0: ahi %r3,257
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1: mvc 0(1,%r4),0(%r2)
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la %r2,1(%r2)
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la %r4,1(%r4)
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ahi %r3,-1
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jnz 1b
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2: lr %r2,%r3
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br %r14
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3: mvc 0(256,%r4),0(%r2)
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la %r2,256(%r2)
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la %r4,256(%r4)
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4: ahi %r3,-256
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jnm 3b
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4: lr %r2,%r3
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5: ex %r3,4(%r1)
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sacf 0
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6: slr %r2,%r2
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br %r14
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.section __ex_table,"a"
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.long 0b,3b
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.long 2b,3b
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.long 3b,4b
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.long 1b,2b
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.long 3b,0b
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.long 5b,0b
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.previous
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.align 4
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@ -88,30 +88,31 @@ __copy_to_user_asm:
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.globl __copy_in_user_asm
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# %r2 = from, %r3 = n, %r4 = to
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__copy_in_user_asm:
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aghi %r3,-1
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jo 6f
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sacf 256
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bras 1,1f
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mvc 0(1,%r4),0(%r2)
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0: mvc 0(256,%r4),0(%r2)
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la %r2,256(%r2)
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la %r4,256(%r4)
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1: aghi %r3,-256
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jnm 0b
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2: ex %r3,0(%r1)
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sacf 0
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slgr %r2,%r2
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br 14
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3: mvc 0(1,%r4),0(%r2)
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bras %r1,4f
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0: aghi %r3,257
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1: mvc 0(1,%r4),0(%r2)
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la %r2,1(%r2)
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la %r4,1(%r4)
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aghi %r3,-1
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jnm 3b
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4: lgr %r2,%r3
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sacf 0
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jnz 1b
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2: lgr %r2,%r3
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br %r14
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3: mvc 0(256,%r4),0(%r2)
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la %r2,256(%r2)
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la %r4,256(%r4)
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4: aghi %r3,-256
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jnm 3b
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5: ex %r3,4(%r1)
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sacf 0
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6: slgr %r2,%r2
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br 14
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.section __ex_table,"a"
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.quad 0b,3b
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.quad 2b,3b
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.quad 3b,4b
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.quad 1b,2b
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.quad 3b,0b
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.quad 5b,0b
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.previous
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.align 4
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