success even though no CTF section was present in the kernel or module.
This fixes the panic that several people saw when trying out the FBT
provider without updating /boot or missing a CTF section in /netbsd.
at boot.
Add a ksyms_mod_foreach() function to iterate a callback function over the
set of elf symbols for a specific module (netbsd included).
Add kern_ctf.c and mod_ctf_get() to allow the retrieval and decompression
of CTF sections for a specific module.
- Output a .bss section and make all the symbols relative to it, instead
of making them absolute.
- Output a single load section, no need for two.
'gdb /dev/ksyms' still doesn't work because ksyms doesn't do mmap yet.
phases, so move the initialization of the ksyms mutex back into main via
a function called ksyms_init. Rename the existing (but quite different)
ksyms_init* variations into ksyms_addsyms_elf() and ksyms_addsyms_explicit()
and adapt machdep code accordingly.
- mutex_enter() from ksyms_getval() could panic due to a change made
in revision 1.40. Fix it.
- Replace the p-tree with a binary search of global symbols. Saves about
250kB of wired memory on i386 and allows for faster lookups within
module symbol tables.
- Make ksyms MT safe.
- Fix deadlock from an operation like "modload foo.lkm < /dev/ksyms".
- Fix uninitialized structure members.
- Reduce memory footprint for loaded modules.
- Export ksyms structures for kernel grovellers like savecore.
- Some KNF.
When returning a "close" symbol, make sure the value being searched for is
within the symtab. This prevents ddb matching addresses beyond the end of
the kernel.
required to initialize ksyms_hdr. Otherwise LKMs do not work when using
ksyms_init_explicit instead of ksyms_init, as is the case of booting an
i386 kernel using Multiboot.
exact address of the symtab and strtab ELF sections contents beforehand.
This will be used in i386's Multiboot code to add the initial kernel ksyms
without having to prepare a minimal ELF image that matches the format
expected by the reguluar ksyms_init function.
This part was reviewed by cube@ and successfully passes a full i386 release
build.
broken. Inside the kernel, we always have to use the real values of the
st_name fields, and only do the math when the request comes from userland.
No need for ksyms_getval_from{kernel,userland} hack anymore. However, a
different version will be asked for pull-up in -2{,-0}, one that doesn't
break the API, that is.
Fixes PR#29133 from Jens Kessmeier.
