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 beca

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.

show more ...

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 co

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.

show more ...

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 ufe

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.

show more ...

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.

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.

show more ...

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.

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

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.

show more ...

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

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@.

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

- 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 acce

- 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.

show more ...

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.

Add few comments.

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

Reviewed by <ad>.

Remove clause 3 and 4 from TNF licenses

Make this preemption safe.

fillw() is no longer used.

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

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.

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-predic

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.

show more ...

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

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

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