| Commit message (Collapse) | Author | Age | Files | Lines |
|---|
| | |
|
| |
|
|
| |
Check for duplicate docstrings.
|
| |
|
|
|
|
|
|
| |
Add the standard mnemonic for each opcode.
We aren't ever going to have complete docs of the subset of the x86 ISA
we support, so we need to help readers cross-correlate with the complete
docs.
|
| |
|
|
|
|
| |
It now includes details for 8-bit registers. And we'll just use the classic
names for the registers so that the relationships between 8- and 32-bit
versions are more obvious.
|
| | |
|
| | |
|
| | |
|
| |
|
|
|
|
|
|
|
|
|
| |
Now simulated 'Memory' isn't just a single flat array. Instead it knows
about segments and VMAs.
The code segment will always be first, and the data/heap segment will always
be second. The brk() syscall knows about the data segment.
One nice side-effect is that I no longer need to mess with Memory initialization
regardless of where I place my segments.
|
| |
|
|
| |
Include LEA (load effective address) in the SubX subset of x86 ISA.
|
| | |
|
| | |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Streamline the factorial function; we don't need to save a stack variable
into a register before operating on it. All instructions can take a stack
variable directly.
In the process we found two bugs:
a) Opcode f7 was not implemented correctly. It was internally consistent
but I'd never validated it against a natively running program. Turns out
it encodes multiple instructions, not just 'not'.
b) The way we look up imm32 operands was sometimes reading them before
disp8/disp32 operands.
|
| |
|
|
|
|
|
|
|
|
|
| |
The new example ex9 doesn't yet work natively.
In the process I've emulated the kernel's role in providing args, implemented
a couple of instructions acting on 8-bit operands (useful for ASCII string
operations), and begun the start of the standard library (ascii_length
is the same as strlen).
At the level of SubX we're just only going to support ASCII.
|
| |
|