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we could use 'A' here but then it would require the new acid.
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to make it easier to write portable acid code, we
introduce 'A' format in the same meaning as in db(1):
A Print the value of dot in hexadecimal. Dot is
unaffected.
both 'a' (symbolic) and 'A' will both have 64 or 32 bit
size depending on the mach, so pointer array indexing
works the same.
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we cannot call gc() in execute() because it will gc
anonyous intermediate results which happens when we
construct a list and the elements are calculated by
calling a function thru ocall() which calls execute().
also, the _thiscmd symbol; which is used to keep
a reference to a statement so it wont get garbage
collected; does not work as yyparse() is recursive
(include statements).
we add execrec() function which *only* gets called from
yyparse() when evaluating a statement. it will
keep a stack on the _thiscmd symbol handling the yyparse()
recursion.
we also only call gc() in execrec() before calling
execute(). so execute() will never gc() while evaluating
a statement which prevents the intermediate results
from getting collected.
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file offset is 64 bit signed integer, negative offsets
are invalid and rejected by the kernel. to still access
kernel memory on amd64, we unconditionally clear the sign
bit of the 64 bit offset in libmach and devproc sign
extends the offset back to a 64 bit address.
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when using the jpg(1) programs interactively, draw the
image in the center of it. this avoids wasting space
with always on borders on small windows and looks better
when used in fullscreen.
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we used to override/reuse mtrr slots over 4GB as the
kernel wasnt able to use that memory. pc64 can.
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setregisters
on intel processors, a general protection exception is fired if a non-canonical address is loaded into PC during SYSRET. this will cause the kernel to panic.
see http://www.kb.cert.org/vuls/id/649219 and the intel software developer manual for more information.
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note, arenas and blocks still use ulong for sizes. so
we have to check for overflow when attempting to merge
arenas.
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kmapindex has to be per process, not per mach, as the process
can be switched to another processor while the mapping is
established.
to bootstrap the first process, we have to temporarily set up
so the kmap MMU's can be attached to the process. previously
we assumed that the first two pages for the initial process
where below 2GB and could be accessed with KADDR() directly.
with 16GB machine, all the 2GB above KZERO are dedicated to
the kernel so the user pages returned by newpage() need to
be mapped.
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we have to use (void*)0 instead of (int)0 otherwise the
upper bits are uninitialized on amd64.
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no need for switch here, just calculate the values. also fixes
6l warning about uninitialized min/max (compiler assumes none
of the case statements could match).
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the Mach page size is used to calculate segment alignment. its
not the real effective page size used by the kernel.
this fixes acid.
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this doubling affects all segment types, not just bss.
(tho text/data are usually small...)
and theres no telling if the segment will actually
grow in the future justifying the reduction of memmove
overhead in ibrk().
some ape programs are approaching the 16mb ssegmap size
so that code might trigger.
removing the smarts...
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just copies from pc kernel. should refactor into common
pc code.
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we have to keep kmap page tables in ther own list
because user tables are subject to (virtual) tlb flushing.
we never free kmap page tables except in mmurelease()
where we just link the kmap mmu list in front of the user
mmus and call mmufree() which will free all the mmu's
of the process.
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as erik quanstro suggests, theres not much of a point in
storing the full 64bit pc as one cannot get a code segment
bigger than 4G and amd64 makes it hard to use a pc that
isnt 64bit sign extension of 32bit.
instead, we only store ulong (as originally), but sign
extend back when returning in getmalloctag() and
getrealloctag().
getrealloctag() used to be broken. its now fixed.
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we free the wrong pointer in the waserror() block.
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