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Problem report from Brian Cuthie regarding incorrect calculation

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of BSS size.  The conversion from a count of u8's to a count of
u32's was shifting in the wrong direction.  This error had been in
the start code a long time.  It had not caused problems because
the BSS is typically much smaller than the C heap which typically
follows it in memory.  Plus since this code was executed at start
time, all that really happened was an extra zeroing of some memory.
This commit is contained in:
Joel Sherrill
1998-02-06 13:47:09 +00:00
parent 02d19d8123
commit f02ffcaa6a
1 changed files with 2 additions and 1 deletions
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c/src/lib/libbsp/i386/pc386/start/start.s
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@@ -165,7 +165,8 @@ SYM (zero_bss):
movl $ SYM (_end), ecx # find end of .bss
movl $ SYM (_bss_start), edi # edi = beginning of .bss
subl edi, ecx # ecx = size of .bss in bytes
shll ecx # size of .bss in longs
shrl ecx # size of .bss in longs
shrl ecx
xorl eax, eax # value to clear out memory
repne # while ecx != 0
stosl # clear a long in the bss