Commit Graph

24 Commits

Author SHA1 Message Date
Bananymous 42772611ce Kernel: Add fast page to page table
Add "fast page" to KERNEL_OFFSET. This is always present in page
tables and only requires changing the page table entry to map. This
requires no interrupts since it should only be for very operations
like memcpy.

I used to map all temporary mappings to vaddr 0, but this is much
better. C++ standard always says that nullptr access is undefined
and this gets rid of it.

Fixed some bugs I found along the way
2023-10-30 19:02:09 +02:00
Bananymous b5d873dfae Kernel/LibELF: Map pages always as RW so kernel can write to them
Kernel doesn't seem to require W permissions to a page without UEFI
so this had not been found earlier.
2023-10-30 12:14:12 +02:00
Bananymous f3d9da9549 Kernel: Rewrite all read/write functions to use BAN::ByteSpan
This allows us to not work with raw pointers and use sized containers
for reading and writing.
2023-10-24 11:56:00 +03:00
Bananymous 9a6cc0dc2d Kernel: Check whether ELF address space can be loaded
Before reserving address space in SYS_EXEC verify that ELF address
space is actually loadable. For example when trying to execute the
kernel binary in userspace, binarys address space would overlap with
current kernel address space. Now kernel won't crash anymore and
will just send SIGKILL to the process calling exec*().
2023-10-12 22:59:36 +03:00
Bananymous 5ee3506474 Kernel: Add physical memory info to /proc/{pid}/meminfo 2023-09-30 22:11:45 +03:00
Bananymous 56bb419884 Kernel: All process' memory areas can report their virtual mem usage 2023-09-30 21:15:46 +03:00
Bananymous 06af9f3187 LibELF: Optimize LoadableELF::clone() memory usage
We only clone mapped pages that have been marked as writeble.
Read/execute only pages will be exactly as in the file itself and
can be demand paged also :D
2023-09-29 02:05:12 +03:00
Bananymous 8357dd7b3d LibELF: Implement new ELF structure
This structure is used for demand pagable execution. It handles all
memory allocation and file reading.
2023-09-29 01:58:03 +03:00
Bananymous 5bdf7d313f LibELF: Add types for native executable 2023-09-29 01:56:57 +03:00
Bananymous 921d95d18f All: Clear lines with only whitspace in them 2023-09-10 00:31:42 +03:00
Bananymous 8032824054 BuildSystem: use -a with rsync
This allows cmake to not rebuild whole project every time
2023-08-28 11:38:17 +03:00
Bananymous 80e7a89f67 BuildSystem: Base sysroot is now distributed as a tar ball
This allows file and directory permissions work as intended.

cmake is now filled with 'sudo' but with sudo timeout this should be
fine.
2023-08-23 10:38:21 +03:00
Bananymous 275a730485 LibELF: We use BAN::Vector<uint8_t> as elf storage
This is made possible by the dynamic kmalloc
2023-06-18 23:29:23 +03:00
Bananymous c7ec19c25c Kernel: Add basic Credentials for the system
Now filesystem access/open, etc confirm that you have access for rwxs
2023-06-11 20:06:06 +03:00
Bananymous 801025ad7b Kernel: Big commit. Rewrite ELF loading code
We now load ELF files to VirtualRanges instead of using kmalloc.
We have only a fixed 1 MiB kmalloc for big allocations and this
allows loading files even when they don't fit in there.

This caused me to rewrite the whole ELF loading process since the
loaded ELF is not in memory mapped by every process.

Virtual ranges allow you to zero out the memory and to copy into
them from arbitary byte buffers.
2023-06-09 00:37:43 +03:00
Bananymous 80d9f6131b Kernel/LibC: move file offset back to kernel
This makes keeping track of offsets easier and more proper
2023-05-26 22:31:21 +03:00
Bananymous 729ff267d7 LibC: add function declarations to sys/stat.h 2023-05-11 15:11:33 +03:00
Bananymous ff2e2937a5 Kernel: Remove offset from OpenFileDescriptor
This is now handled on the libc side. There might be reasons to
have it in kernel side, but for simplicity's sake I'm moving it
to libc for now :)
2023-05-09 20:31:22 +03:00
Bananymous 850ff93940 LibELF: Add 32 bit support 2023-04-22 19:00:18 +03:00
Bananymous ef0263e32d LibELF: Header printing can now be turned off 2023-04-22 15:34:09 +03:00
Bananymous 4588e25d27 LibELF: ELF now has methods for accessing more attributes
You can now access the program headers and the memory itself
2023-04-22 15:31:05 +03:00
Bananymous 7d57d2fcfb LibELF: remove unused file 2023-04-19 17:32:12 +03:00
Bananymous d63716db96 Kernel: Process is not reference counted any more
This was not necessary and it made things needlessly complicated
2023-04-19 00:34:18 +03:00
Bananymous 998ae511a3 LibELF: Start implementing elf library 2023-04-18 10:18:15 +03:00