CVS log for src/sys/arch/i386/i386/copy.S

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Keyword substitution: kv
Default branch: MAIN

Make copystr() a MI C function, part of libkern and shared on all
architectures.

Notes:

 - On alpha and ia64 the function is kept but gets renamed locally to avoid
   symbol collision. This is because on these two arches, I am not sure
   whether the ASM callers do not rely on fixed registers, so I prefer to
   keep the ASM body for now.
 - On Vax, only the symbol is removed, because the body is used from other
   functions.
 - On RISC-V, this change fixes a bug: copystr() was just a wrapper around
   strlcpy(), but strlcpy() makes the operation less safe (strlen on the
   source beyond its size).
 - The kASan, kCSan and kMSan wrappers are removed, because now that
   copystr() is in C, the compiler transformations are applied to it,
   without the need for manual wrappers.

Could test on amd64 only, but should be fine.

Sync with HEAD

Pull up following revision(s) (requested by maxv in ticket #1693):

	sys/arch/amd64/amd64/copy.S: revision 1.33
	sys/arch/i386/i386/copy.S: revision 1.31

Hum. Fix a potentially catastrophic bug: kcopy() sets DF=1 if the areas
overlap, but doesn't clear it if the copy faults. If this happens, we
return to the caller with DF=1, and each future memory copy will be
backwards.

I wonder if there really are places where kcopy() is called with
overlapping areas.

Pull up following revision(s) (requested by maxv in ticket #1693):

	sys/arch/amd64/amd64/copy.S: revision 1.33
	sys/arch/i386/i386/copy.S: revision 1.31

Hum. Fix a potentially catastrophic bug: kcopy() sets DF=1 if the areas
overlap, but doesn't clear it if the copy faults. If this happens, we
return to the caller with DF=1, and each future memory copy will be
backwards.

I wonder if there really are places where kcopy() is called with
overlapping areas.

Pull up following revision(s) (requested by maxv in ticket #1693):

	sys/arch/amd64/amd64/copy.S: revision 1.33
	sys/arch/i386/i386/copy.S: revision 1.31

Hum. Fix a potentially catastrophic bug: kcopy() sets DF=1 if the areas
overlap, but doesn't clear it if the copy faults. If this happens, we
return to the caller with DF=1, and each future memory copy will be
backwards.

I wonder if there really are places where kcopy() is called with
overlapping areas.

Pull up following revision(s) (requested by maxv in ticket #1257):

	sys/arch/amd64/amd64/copy.S: revision 1.33
	sys/arch/i386/i386/copy.S: revision 1.31

Hum. Fix a potentially catastrophic bug: kcopy() sets DF=1 if the areas
overlap, but doesn't clear it if the copy faults. If this happens, we
return to the caller with DF=1, and each future memory copy will be
backwards.

I wonder if there really are places where kcopy() is called with
overlapping areas.

Hum. Fix a potentially catastrophic bug: kcopy() sets DF=1 if the areas
overlap, but doesn't clear it if the copy faults. If this happens, we
return to the caller with DF=1, and each future memory copy will be
backwards.

I wonder if there really are places where kcopy() is called with
overlapping areas.

Fix a think-o / paste-o in the max user address check, pointed out
by maxv@.

Overhaul the API used to fetch and store individual memory cells in
userspace.  The old fetch(9) and store(9) APIs (fubyte(), fuword(),
subyte(), suword(), etc.) are retired and replaced with new ufetch(9)
and ustore(9) APIs that can return proper error codes, etc. and are
implemented consistently across all platforms.  The interrupt-safe
variants are no longer supported (and several of the existing attempts
at fuswintr(), etc. were buggy and not actually interrupt-safe).

Also augmement the ucas(9) API, making it consistently available on
all plaforms, supporting uniprocessor and multiprocessor systems, even
those that do not have CAS or LL/SC primitives.

Welcome to NetBSD 8.99.37.

Sync with HEAD

Drop NENTRY() from the x86 kernels, use ENTRY(). With PMCs (and other hardware
tracing facilities) we have a much better ways of monitoring the CPU activity
than GPROF, without software modification.

Also I think GPROF has never worked, because the 'start' functions of both
i386 and amd64 use ENTRY(), and it would have caused a function call while the
kernel was not yet relocated.

Pull up following revision(s) (requested by maxv519):
	sys/arch/i386/conf/largepages.inc: file removal
	sys/arch/i386/conf/kern.ldscript.4MB: file removal
	sys/arch/i386/i386/copy.S: revision 1.26
Sync with amd64, in particular, add END() markers, don't fall through
functions, narrow the copy windows, and remove suword.
Remove these files. No one cares about this on i386, and there is no
point in keeping undocumented options nobody understands anyway.

Add SMAP support for i386.

Sync with amd64, in particular, add END() markers, don't fall through
functions, narrow the copy windows, and remove suword.

update from HEAD

Sync with HEAD

Sync with HEAD

x86_copyargs takes as third argument a size, but still copies two chunks of
16 and 24 bytes, without checking the userland<->kernel limit accordingly.
Fix it by just checking the maximum size direcly.

It means that even if 16 bytes are copied, the kernel now makes sure 40
bytes are in userland. We could make it more fine-grained, but it would
probably unoptimize the function, and we don't care enough.

Sync with HEAD

KNF a little, use C-style comments, and remove susword/fusword. No
functional changes.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Fix a comment describing the check performed by copyin(); the value
checked against VM_MAXUSER_ADDRESS is derived from the source address,
not the destination address. OK rmind@.

Cure sync hiccups. Code with compile errors is not really useful, heh.

sync with head

Sync with HEAD.

sync with head.

return the error from fault handler in ucas_fault
rather than forcing EFAULT.

sync with head

- Use uvm_lwp_setuarea() instead of directly setting address to lwp_t::l_addr.
- Replace most remaining uses of l_addr with uvm_lwp_getuarea() or lwp_getpcb().
- Amend assembly in ports where it accesses PCB via struct user.
- Rename L_ADDR to L_PCB in few places.  Reduce sys/user.h inclusions.

return_address(9) can be called from interrupt context; handle its
page faults appropriately.

Add return_address(9) for reading the Nth return address from the call
stack.

Sync with HEAD.

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

Add few comments.

Sync with HEAD.

Pull up following revision(s) (requested by rmind in ticket #493):
	sys/arch/amd64/amd64/copy.S: revision 1.13
	sys/arch/i386/i386/copy.S: revision 1.17
	sys/sys/systm.h: revision 1.234
Add ucas (CAS for user-space address) support for i386 and amd64.
API provides ucas_int() and ucas_ptr() for now.
Reviewed by <ad>.

Add ucas (CAS for user-space address) support for i386 and amd64.
API provides ucas_int() and ucas_ptr() for now.

Reviewed by <ad>.

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

Make this preemption safe.

fillw() is no longer used.

sync with head

sync with HEAD

Sync with HEAD.

Sync with head.

Sync with HEAD

sync with head.

Use __KERNEL_RCSID().  For these .S files, the following style was
adopted, a la .C files and <sys/cdefs.h>:
  *  move <machine/asm.h> to the top
  *  use __KERNEL_RCSID() immediately after it

Sync with HEAD.

sync with head

Sync with HEAD.

Sync with HEAD.

instead of setting pcb_onfault on every calls of copyin and friends,
make the fault handler investigate program counter of faulting code.
inspired from linux.

Sync with HEAD.

Sync with HEAD

When copying system call arguments into kernel space, either copy 4
arguments (enough for the majority of calls) or the maximum of 10 (8 plus
2 for sys__syscall).
Avoids all the unlikely-to-be-predicted-correctly in the unrolled loop.
This might be a problem if a thread's stack doesn't have the extra args
mapped - but that is extremely unlikely.

Sync with HEAD.

Sync with HEAD

Avoid doing rep; movsl with %ecx == 0, since it's expensive. Suggested
by dsl@.

Remove support for 80386 level CPUs. PR port-i386/36163.

sync with head.

Sync with HEAD.

- Remove I486_CPU, I586_CPU, I686_CPU options. They buy us nothing and
  clutter the code significantly.
- Remove pccons.

Sync with HEAD

Don't unconditionally clear the direction flag. The ABI says it must always
be clear when making a function call, and 'cld' takes about 50 clock cyles
on the P4.

sync with HEAD

sync with head.

Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.

Sync with HEAD.

Sync with head.

merge yamt-x86pmap branch.

- reduce differences between amd64 and i386.  notably, share pmap.c
  between them.  it makes several i386 pmap improvements available to
  amd64, including tlb shootdown reduction and bug fixes from Stephan Uphoff.
- implement deferred pmap switching for amd64.
- remove LARGEPAGES option.  always use large pages if available.
  also, make it work on amd64.

Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree.  Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches.  The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Sync with HEAD

DO_DEFERRED_SWITCH, CHECK_DEFERRED_SWITCH: remove an unused argument.

sync with head.

Sync with HEAD.

Sync with HEAD.

Sync with HEAD.

Sync with HEAD.

- trace_enter/trace_exit/ktrace don't need kernel_lock.
- Use a RISC-style copyin optimised for pulling system call arguments.
  In tests I have done on Intel hardware this removes any measurable
  advantage to passing the syscall arguments in registers.

Sync with head.

Sync with head.

Update to HEAD.

merge yamt-idlelwp branch.  asked by core@.  some ports still needs work.

from doc/BRANCHES:

	idle lwp, and some changes depending on it.

	1. separate context switching and thread scheduling.
	   (cf. gmcgarry_ctxsw)
	2. implement idle lwp.
	3. clean up related MD/MI interfaces.
	4. make scheduler(s) modular.

- separate context switching and thread scheduling.
- introduce idle lwp.
- change some related MD/MI interfaces and implement i386 version.

sync with head.

file copy.S was added on branch yamt-lazymbuf on 2006-06-21 14:52:18 +0000

merge ktrace-lwp.

Sync with HEAD. Here we go again...

file copy.S was added on branch ktrace-lwp on 2005-11-10 13:56:46 +0000

some assym cleanup.
- move copyin and friends from locore.S to their own file, copy.S.
  share it between i386 and xen.
- defparam KERNBASE and kill KERNBASE_LOCORE hack.
- add more symbols to assym.h and use it where appropriate.