Define a HOTPATCH() macro, that puts a label and additional information
in the new .rodata.hotpatch kernel section. In patch.c, scan the section
and patch what needs to be. Now it is possible to hotpatch the content of
a macro.
SMAP is switched to use this new system; this saves a call+ret in each
kernel entry/exit point.
Many other operating systems do the same.
This system call was used in legacy Lisp code, that was inherited to modern
age and still compiled against supported compat layers (e.g. in clisp,
oaklisp, Franz Lisp).
It used to instruct the kernel about paging policy (G/C aware, flush etc).
Newly compiled code (assuming that it will detect vadvise()) will use the
libc stub for vadvise(). The headers for this interface are gone.
vadvise(2) could be marked as COMPAT_80, but as long as we support ultrix,
sunos or aout68k ABI, don't bother with this.
Requested by <mrg>
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
Add atoi to namespace.h.
Register a new __weak_alias() entry for atoi() in atoi.c.
atoi() is used internally in getrpcent(), rresvport_af(), ftok(), err(),
__llvm_profile_write_file(), llvm_gcda_start_file(), citrus_iconv_open(),
getprotoent_r(), __rpc_uaddr2taddr_af(), __res_nopt_rdata() and
servent_parseline().
This revision switches the internal usage to the internal symbol.
Sponsored by <The NetBSD Foundation>
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
Add asctime to namespace.h.
Register a new __weak_alias() entry for asctime() in asctime.c.
acstime() is used internally in ctime and __ctime50. This revision switches
the internal usage to the internal symbol.
Sponsored by <The NetBSD Foundation>
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
Stop using the public global name of dl_iterate_phdr in tls/tls.c:
__libc_static_tls_setup().
Follow the approach with other dlopen(3)-like functions with the
namespace.h in the dl_iterate_phdr() case. Use internally a weak symbol:
__dl_iterate_phdr instead of dl_iterate_phdr.
Sponsored by <The NetBSD Foundation>
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
This change finishes elimination of usage of the global name of the
following symbols:
- close -> _close
- execve -> _execve
- fcntl -> _fcntl
- setcontext -> _setcontext
- wait6 -> _wait6
- write -> _write
- writev -> _writev
Sponsored by <The NetBSD Foundation>
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
This change eliminates usage of the global name of the following symbols:
- fdopen -> _fdopen
- mmap -> _mmap
- strdup -> _strdup
Sponsored by <The NetBSD Foundation>
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
This change eliminates usage of the global name of the following symbol:
- strlcpy -> _strlcpy
Sponsored by <The NetBSD Foundation>
Xen.
With this option, the CPU structures that must always be present in the
CPU's page tables are moved on L4 slot 384, which means address
0xffffc00000000000.
A new pcpu_area structure is defined. It contains shared structures (IDT,
LDT), and then an array of pcpu_entry structures, indexed by cpu_index(ci).
Theoretically the LDT should be in the array, but this will be done later.
During the boot procedure, cpu0 calls pmap_init_pcpu, which creates a
page tree that is able to map the pcpu_area structure entirely. cpu0 then
immediately maps the shared structures. Later, every CPU goes through
cpu_pcpuarea_init, which allocates physical pages and kenters the relevant
pcpu_entry to them. Finally, each pointer is replaced to point to pcpuarea.
The point of this change is to make sure that the structures that must
always be present in the page tables have their own L4 slot. Until now
their L4 slot was that of pmap_kernel, and making a distinction between
what must be mapped and what does not need to be was complicated.
Even in the non-speculative-bug case this change makes some sense: there
are several x86 instructions that leak the addresses of the CPU structures,
and putting these structures inside pmap_kernel actually offered a way to
compute the address of the kernel heap - which would have made ASLR on it
plainly useless, had we implemented that.
Note that, for now, pcpuarea does not contain rsp0.
Unfortunately this change adds many #ifdefs, and makes the code harder to
understand. There is also some duplication, but that will be solved later.
The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
This change eliminates usage of the global changes of the following symbols:
- strlcat -> _strlcat
- sysconf -> __sysconf
- closedir -> _closedir
- fparseln -> _fparseln
- kill -> _kill
- mkstemp -> _mkstemp
- reallocarr -> _reallocarr
- strcasecmp -> _strcasecmp
- strncasecmp -> _strncasecmp
- strptime -> _strptime
- strtok_r -> _strtok_r
- sysctl -> _sysctl
- dlopen -> __dlopen
- dlclose -> __dlclose
- dlsym -> __dlsym
Sponsored by <The NetBSD Foundation>
This is actually harmless, since:
- the offset is too short rather than too long (no overflow)
- the struct audio_device comes from userland (no information leak)
"looks good to me" nat@
