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plus a few minor additions and explication.
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README.md
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@ -46,35 +46,42 @@ and how parameters are passed.
In this book we will use the ARM LINUX conventions. This means: In this book we will use the ARM LINUX conventions. This means:
* You *may** need to run a ARM Linux VM on the Macintosh - even on * You *may* need to run a ARM Linux VM on the Macintosh - even on
ARM-based Macs. Why? Apple uses a different calling convention. ARM-based Macs. Why? Apple uses a different calling convention.
The convention used in this book should work on all ARM Linux The convention used in this book should work on all ARM Linux
machines while the Apple calling convention is specific to Apple machines while the Apple calling convention is specific to Apple
Silicon-based machine. Silicon-based machines.
This necessity did not sit well with some on reddit. We listened. This necessity did not sit well with some on reddit. We listened.
We now have a chapter devoted to bringing Linux and Apple code We now have a chapter devoted to bringing Linux and Apple code
together to the degree possible. [This chapter](./more/apple_silicon/) together to the degree possible. [This chapter](./more/apple_silicon/)
also provides a suite of macros that provide this help. also provides a suite of macros that provide this help. If you're
willing to adjust how you code (and use the macros), you can
sucessfully write assembly language once and build it on both Linux
and Mac OS.
* You will need to run WSL (Windows Subsystem for Linux) on ARM-based * You will need to run WSL (Windows Subsystem for Linux) on ARM-based
Windows machines. These do exist! Windows machines. These do exist!
* You will need to run an ARM Linux VM on x86-based Windows machines. * You will need to run an ARM Linux VM on x86-based Windows machines.
This is true even if you are on an ARM-based Windows machine for the This is true even if you are on an ARM-based Windows machine as there
same reasons indicated above for Apple Silicon. In the future, we are so many differences between a Unix-like environment and Windows.
hope to add a chapter detailing the Windows calling convention.
You'll notice right away that we make use of the C-runtime directly You'll notice right away that we make use of the C-runtime directly
rather than make OS service calls. So, for instance, if we want to call rather than make OS service calls. So, for instance, if we want to call
`write()`, we call `write` from the assembly language. This version of `write()`, we call `write` from the assembly language. This version of
the system call `write` is a wrapper function built into the C-runtime the system call `write` is a wrapper function built into the C-runtime
which handles the low level details of performing a system call. See the (CRT)
which handles the lower level details of performing a system call. See the
[here](./more/system_calls/README.md) on what actually happens inside [here](./more/system_calls/README.md) on what actually happens inside
these wrapper functions. these wrapper functions.
The benefit of using the CRT wrappers is that there are details, explained
in the chapter, that differ from system to system and architecture to
architecture even for making the same system call.
## A Lot of Names ## A Lot of Names
As commendable as the ARM designs are, ARM's naming conventions for As commendable as the ARM designs are, ARM's naming conventions for
@ -268,6 +275,7 @@ What would a book about assembly language be without bit bashing?
| ------- | -------- | --- | | ------- | -------- | --- |
| --- | [Determining string literal lengths for C functions](./more/strlen_for_c/README.md) | NA | | --- | [Determining string literal lengths for C functions](./more/strlen_for_c/README.md) | NA |
| --- | [Under the hood: System Calls](./more/system_calls/README.md) | NA | | --- | [Under the hood: System Calls](./more/system_calls/README.md) | NA |
| --- | [Apple Silicon](./more/apple_silicon/README.md) | NA |
## Projects ## Projects