diff options
| author | Richard Henderson <rth@kanga.twiddle.net> | 2003-07-16 07:24:40 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@kanga.twiddle.net> | 2003-07-16 07:24:40 -0700 |
| commit | fd1f3351485ebb28d8aad17e3d0cb540190151b5 (patch) | |
| tree | c278b25eac1f8ab27eb29dc0ae39e81206544269 | |
| parent | f3596aae38f06b98f76951df36a4111df25fc6d5 (diff) | |
[ALPHA] Do ISO C90 strncpy buffer zeroing.
| -rw-r--r-- | arch/alpha/lib/strncpy.S | 59 |
1 files changed, 52 insertions, 7 deletions
diff --git a/arch/alpha/lib/strncpy.S b/arch/alpha/lib/strncpy.S index 7d64d21d5af3..338551c7113c 100644 --- a/arch/alpha/lib/strncpy.S +++ b/arch/alpha/lib/strncpy.S @@ -16,7 +16,7 @@ .text - .align 3 + .align 4 .globl strncpy .ent strncpy strncpy: @@ -24,13 +24,58 @@ strncpy: .prologue 0 mov $16, $0 # set return value now - beq $18, 0f - mov $26, $23 # set return address - br __stxncpy # do the work of the copy + beq $18, $zerolen + unop + bsr $23, __stxncpy # do the work of the copy + + unop + bne $18, $multiword # do we have full words left? + subq $24, 1, $3 # nope + subq $27, 1, $4 + + or $3, $24, $3 # clear the bits between the last + or $4, $27, $4 # written byte and the last byte in COUNT + andnot $4, $3, $4 + zap $1, $4, $1 + + stq_u $1, 0($16) + ret + + .align 4 +$multiword: + subq $24, 1, $2 # clear the final bits in the prev word + or $2, $24, $2 + zapnot $1, $2, $1 + subq $18, 1, $18 + + stq_u $1, 0($16) + addq $16, 8, $16 + unop + beq $18, 1f -0: ret - nop nop + unop nop + blbc $18, 0f + + stq_u $31, 0($16) # zero one word + subq $18, 1, $18 + addq $16, 8, $16 + beq $18, 1f + +0: stq_u $31, 0($16) # zero two words + subq $18, 2, $18 + stq_u $31, 8($16) + addq $16, 16, $16 + bne $18, 0b + +1: ldq_u $1, 0($16) # clear the leading bits in the final word + subq $27, 1, $2 + or $2, $27, $2 + + zap $1, $2, $1 + stq_u $1, 0($16) +$zerolen: + ret - .end strncpy + .end strncpy |