Created the framework for using different loadable panic handlers,
loaded by the bootloader. Initial panic handler is panic.serial, which
contains its own serial driver and stacktrace code.
Other related changes:
- Asserts are now based on the NMI handler - panic handlers get
installed as the NMI interrupt handler
- Changed symbol table generation: now use nm's own demangling and
sorting, and include symbol size in the table
- Move the linker script argument out of the kernel target, and into the
kernel's specific module, so that other programs (ie, panic handlers)
can use the kernel target as well
- Some asm changes to boot.s to help GDB see stack frames - but this
might not actually be all that useful
- Renamed user_rsp to just rsp in cpu_state - everything in there is
describing the 'user' state
Update the build_sysroot to build an LLVM 11 sysroot, dealing with
LLVM's change in structure. Also re-add peru.yaml for getting a
pre-built sysroot via peru.
See: https://github.com/buildinspace/peru
For the fb driver to have a font before loading from disk is available,
create a hard-coded font as a byte array.
To create this, added a new scripts/psf_to_cpp.py which also refactored
out much of scripts/parse_font.py into a new shared module
scripts/fontpsf.py.
Create a new framebuffer driver. Also hackily passing frame buffer size
in the list of init handles to all processes and mapping the framebuffer
into all processes. Changed bootloader passing frame buffer as a module
to its own struct.
On my laptop, a few symbol names raise errors as invalid when attempting
to demangle them. This should not stop the rest of the symbol table from
building.
Remove ELF and initrd loading from the kernel. The bootloader now loads
the initial programs, as it does with the kernel. Other files that were
in the initrd are now on the ESP, and non-program files are just passed
as modules.
vm_space no longer relies on page_manager to map pages during a page
fault. Other changes that come with this commit:
- C++ standard has been changed to C++17
- enum bitfield operators became constexpr
- enum bifrield operators can take a mix of ints and enum arguments
- added page table flags enum instead of relying on ints
- remove page_table::unmap_table and page_table::unmap_pages
Create a script that builds a simple-to-read symbol table from the
output of `nm`. Include running that script over the kernel in the
build, and including that output in the initrd.
Tags: callstack debugging
Exiting boot services can't actually be done from inside
`bootloader_uefi_main`, because there are objects in that scope that run
code requiring boot services in their destructors.
Also added `support.cpp` with `memcpy` because clang will emit
references to `memcpy` even in freestanding mode.
Added a `debug_break` function to allow for faking breakpoints when
connecting to the bootloader with GDB.
Tags: debug
* Link host-targeted binaries with lld
* Add peru script for getting prebuilt sysroot
* Add readme for prebuilt sysroots
* Remove non-working build_sysroot_gcc.sh, rename clang version to just
build_sysroot.sh
- More sensible stack tracer, in C++ (no symbols yet)
- Was forgetting to add null frame to new kernel stacks
- __kernel_assert was using an old vector
- A GP fault will only print its associated table entry
The modules.yaml now has an optional defines: list per module that adds
preprocessor definitions to the build scripts. Also added a --debug flag
to qemu.sh to run QEMU's debugger host.
