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Category: Kernel

newlib linker script summary for you own executable

After i build my newlib by “../newlib-2.1.0/configure –target=$TARGET –prefix=$PREFIX”, except the libc.a and crt0.o, i got these linker scripts. I am still thinking which one i should use for my own executables in my OS. elf_i386.x Default linker script, for normal executables elf_i386.xbn Script for -N: mix text and data on same page; don’t align […]

How to use PFSBuilder

How to use PFSBuilder This tutorial work in windows/linux/mac Step 1) Download the jar https://www.dropbox.com/s/do0ygc4z9dbxlwx/PFSBuilder-20140619.jar Step 2) make sure you have java in your PC Compress directory into PFS image Step 1) Make sure PFSBuilder.jar is in your current directory Step 2) Create a folder call “input” and put some files and directories in there Step […]

newlib’s reentrant system calls will map to non-reentrant by default

newlib’s reentrant system calls will map to non-reentrant by default. The reentrant version of open() can be found in newlib-2.1.0/newlib/libc/reent/openr.c As you can see, it will call _open which is defined in newlib-2.1.0/newlib/libgloss/libnosys/open.c . So if you don’t write your reentrant functions, it will jump to non-reentrant by default. For OS developer want to implement […]

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