mirror of
https://github.com/tailix/libkernaux.git
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247 lines
7.4 KiB
Markdown
247 lines
7.4 KiB
Markdown
libkernaux
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==========
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[](https://github.com/tailix/libkernaux/actions/workflows/test.yml)
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Auxiliary library for kernel development.
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Table of contents
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-----------------
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* [Overview](#libkernaux)
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* [Table of contents](#table-of-contents)
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* [API](#api)
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* [Tips](#tips)
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* [Installation](#installation)
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* [Development](#development)
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* [Cross](#cross)
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* [Portability](#portability)
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* [Discussion](#discussion)
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* [Summary](#summary)
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* [Pure code size](#pure-code-size)
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* [Used header files](#used-header-files)
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API
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---
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* Runtime environment
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* [Assertions](/include/kernaux/assert.h)
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* [Example](/examples/assert.c)
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* [Architecture-specific helpers](/include/kernaux/arch/)
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* Device drivers (for debugging only)
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* [Serial console](/include/kernaux/console.h)
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* Framebuffer *(planned)*
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* Algorithms
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* [Simple command line parser](/include/kernaux/cmdline.h)
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* [Example](/examples/cmdline.c)
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* [Page Frame Allocator](/include/kernaux/pfa.h)
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* [Example](/examples/pfa.c)
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* Data formats
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* [Multiboot 2 (GRUB 2) information parser](/include/kernaux/multiboot2.h)
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* [ELF utils](/include/kernaux/elf.h) *(work in progress)*
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* Utilities
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* [Measurement units utils](/include/kernaux/units.h) *(work in progress)*
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* [To human](/examples/units_human.c)
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* Usual functions
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* [libc replacement](/include/kernaux/libc.h)
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* `memset`
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* `strcpy`
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* `strlen`
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* [itoa replacement](/include/kernaux/itoa.h) *(work in progress)*
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* [printf replacement](/include/kernaux/printf.h) *(work in progress)*
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* [printf](/examples/printf.c)
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* [printf_va](/examples/printf_va.c)
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Tips
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----
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### Installation
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```
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./autogen.sh
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./configure
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make
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sudo make install
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```
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This is just a usual library. You can use most of it's APIs in hosted
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environment.
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### Development
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```
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./autogen.sh
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./configure --enable-assert --enable-null-guard
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make
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```
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You can test with `make check`.
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### Cross
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The library depends on `stdint.h` header. According to the standards it must be
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present in freestanding environment. However when you build GCC cross-compiler
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using [instructions from OSDev Wiki](https://wiki.osdev.org/GCC_Cross-Compiler)
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the header is missing. To fix this issue you may add `use_gcc_stdint=provide` to
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the end of `gcc/config.gcc` in your GCC source code extracted from tarball:
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```
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echo 'use_gcc_stdint=provide' >> gcc-11.2.0/gcc/config.gcc
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```
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---
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Create configuration script with `./autogen.sh`.
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Let's assume that your target triplet is `i386-elf`. Configure with
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cross-compiler in `$PATH` to make without it in `$PATH`:
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```
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./configure \
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--host='i386-elf' \
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--enable-libc \
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AR="$(which i386-elf-ar)" \
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CC="$(which i386-elf-gcc)" \
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RANLIB="$(which i386-elf-ranlib)" \
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CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
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```
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You can see the following messages. It's
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[a bug](https://savannah.gnu.org/support/index.php?110393) in **autoconf**, just
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ignore it.
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```
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checking for _Bool... no
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checking stdarg.h usability... no
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checking stdarg.h presence... yes
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configure: WARNING: stdarg.h: present but cannot be compiled
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configure: WARNING: stdarg.h: check for missing prerequisite headers?
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configure: WARNING: stdarg.h: see the Autoconf documentation
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configure: WARNING: stdarg.h: section "Present But Cannot Be Compiled"
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configure: WARNING: stdarg.h: proceeding with the compiler's result
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configure: WARNING: ## ---------------------------------------------------------- ##
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configure: WARNING: ## Report this to https://github.com/tailix/libkernaux/issues ##
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configure: WARNING: ## ---------------------------------------------------------- ##
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checking for stdarg.h... no
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checking stddef.h usability... no
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checking stddef.h presence... yes
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configure: WARNING: stddef.h: present but cannot be compiled
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configure: WARNING: stddef.h: check for missing prerequisite headers?
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configure: WARNING: stddef.h: see the Autoconf documentation
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configure: WARNING: stddef.h: section "Present But Cannot Be Compiled"
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configure: WARNING: stddef.h: proceeding with the compiler's result
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configure: WARNING: ## ---------------------------------------------------------- ##
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configure: WARNING: ## Report this to https://github.com/tailix/libkernaux/issues ##
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configure: WARNING: ## ---------------------------------------------------------- ##
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checking for stddef.h... no
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```
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To install into specific directory use full path:
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`DESTDIR="$(pwd)/dest" make install` instead of `DESTDIR=dest make install`.
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When configured with cross-compiler, library can't be build and installed with
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just `make && sudo make install`. Instead use the following commands:
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* `make libkernaux.a`
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* `sudo make install-exec`
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* `sudo make install-data`
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Check if compilation targets i386: `objdump -d src/arch/i386.o`. It should
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output something like this:
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```
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src/arch/i386.o: file format elf32-i386
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Disassembly of section .text:
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00000000 <kernaux_arch_i386_hang>:
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0: fa cli
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1: f4 hlt
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2: eb fc jmp 0 <kernaux_arch_i386_hang>
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00000004 <kernaux_arch_i386_read_cr0>:
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4: 0f 20 c0 mov %cr0,%eax
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7: c3 ret
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00000008 <kernaux_arch_i386_read_cr4>:
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8: 0f 20 e0 mov %cr4,%eax
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b: c3 ret
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0000000c <kernaux_arch_i386_write_cr0>:
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c: 8b 44 24 04 mov 0x4(%esp),%eax
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10: 0f 22 c0 mov %eax,%cr0
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13: c3 ret
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00000014 <kernaux_arch_i386_write_cr3>:
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14: 8b 44 24 04 mov 0x4(%esp),%eax
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18: 0f 22 d8 mov %eax,%cr3
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1b: c3 ret
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0000001c <kernaux_arch_i386_write_cr4>:
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1c: 8b 44 24 04 mov 0x4(%esp),%eax
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20: 0f 22 e0 mov %eax,%cr4
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23: c3 ret
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```
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Portability
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-----------
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Except GNU/Linux, the library is periodically successfully built (starting with
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`./autogen.sh`) and tested with **autoconf**, **automake**, **binutils** and
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**gcc**/**clang** (depending on what is present) on the following operating
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systems:
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* FreeBSD 13.0
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* Minix 3.3.0
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* NetBSD 9.2
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* OpenBSD 7.0
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Discussion
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----------
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* [Topic on OSDev.org forum](https://forum.osdev.org/viewtopic.php?f=1&t=37958)
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* [Thread on r/osdev](https://www.reddit.com/r/osdev/comments/k3ueeu/libkernaux_auxiliary_library_for_kernel/)
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Summary
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-------
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This information is updated from time to time.
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### Pure code size
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`cloc --vcs=git include/ src/`
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```
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-------------------------------------------------------------------------------
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Language files blank comment code
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-------------------------------------------------------------------------------
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C 12 236 19 1548
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C/C++ Header 14 179 64 597
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Assembly 2 7 6 28
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make 1 0 0 13
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-------------------------------------------------------------------------------
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SUM: 29 422 89 2186
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-------------------------------------------------------------------------------
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```
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### Used header files
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`git grep '#include <' -- include/ src/ | grep -v '#include <kernaux' | awk '{ print $2; }' | sort | uniq`
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* `stdarg.h`
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* `stdbool.h`
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* `stddef.h`
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* `stdint.h`
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