Andreas Kling
76b9fb258d
UserspaceEmulator: Convert the XOR instruction to inline assembly
2020-07-11 16:02:25 +02:00
Andreas Kling
9db588daf1
UserspaceEmulator: Convert the SUB instruction to inline assembly
2020-07-11 15:52:53 +02:00
Andreas Kling
7d41b95071
UserspaceEmulator: Tweak INC and SAR helpers to not be SoftCPU members
...
It's quite nice having these as compartmentalized free functions.
2020-07-11 15:47:53 +02:00
Andreas Kling
e852768ba6
UserspaceEmulator: Add the INC and ADD instructions
...
More inline assembly. I'm still figuring out how to combine templates
and inline assembly, but it's turning out pretty cool. :^)
2020-07-11 14:20:08 +02:00
Andreas Kling
133803b8a7
UserspaceEmulator: Split SAR inline assembly into 8/16/32 bit variants
2020-07-11 13:43:27 +02:00
Andreas Kling
743d4ccb8f
UserspaceEmulator: Support MOV_RM32_reg32 with memory destination
2020-07-11 13:29:05 +02:00
Andreas Kling
e5afe6a579
UserspaceEmulator: Implement the CMP family of instructions
...
These are identical to SUB, except they don't store the result (they
only upate the arithmetic flags.)
2020-07-11 13:27:40 +02:00
Andreas Kling
58fd010caf
UserspaceEmulator: Implement a bunch of the MOV instructions
2020-07-10 20:29:14 +02:00
Andreas Kling
04d58f54b3
UserspaceEmulator: Implement the SAR instruction
...
Let's try doing this with some inline assembly. We know we're running
on an x86 target anyway. :^)
2020-07-10 20:20:27 +02:00
Andreas Kling
3899effb19
UserspaceEmulator: Implement the SUB family of instructions
2020-07-10 20:20:27 +02:00
Andreas Kling
0cf7fd5268
UserspaceEmulator+LibX86: Implement all the forms of XOR
...
And they're all generic, which will make it easy to support more ops.
2020-07-10 20:20:27 +02:00
Andreas Kling
6f27770cea
UserspaceEmulator: Add 8/16 bit memory read/write operations
2020-07-10 20:20:27 +02:00
Andreas Kling
f8b38eabeb
UserspaceEmulator: First cut of generic instruction implementations
...
Let's use C++ templates to implement the generic parts of instructions.
There are tons of them with the same set of inputs, just different
behavior. Templates are perfect for this.
2020-07-10 20:20:27 +02:00
Andreas Kling
30ef30ca09
UserspaceEmulator: Add proper segment registers
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Some things will flow better if we're able to index into a table of our
segment registers.
2020-07-10 20:20:27 +02:00
Andreas Kling
f1801cfb28
UserspaceEmulator: Fix a Clang warning
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Clang didn't like default construction of PartAddressableRegister,
so let's just use memset() then.
2020-07-10 20:20:27 +02:00
Andreas Kling
4d8683b632
UserspaceEmulator: Tidy up SoftCPU's general purpose registers
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This patch adds a PartAddressableRegister type, which divides a 32-bit
value into separate parts needed for the EAX/AX/AL/AH register splits.
Clean up the code around register access to make it a little less
cumbersome to use.
2020-07-09 23:27:50 +02:00
Andreas Kling
d10765bec3
UserspaceEmulator: Add an initial stack and implement PUSH/POP reg32
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Programs now start out with a 64 KB stack at 0x10000000. :^)
2020-07-09 16:20:08 +02:00
Andreas Kling
8ab601f9e1
UserspaceEmulator: Implement XOR_RM32_reg32
...
Note that this is a partial implementation since we don't have support
for memory r/m variants yet.
2020-07-07 22:44:58 +02:00
Andreas Kling
934f0b999e
UserspaceEmulator: Add arithmetic CPU flags
2020-07-07 22:44:58 +02:00
Andreas Kling
8d8bb07476
UserspaceEmulator: Start building a userspace X86 emulator :^)
...
This introduces a new X86 CPU emulator for running SerenityOS userspace
programs in a virtualized interpreter environment.
The main goal is to be able to instrument memory accesses and catch
interesting bugs that are very hard to find otherwise. But before we
can do fancy things like that, we have to build a competent emulator
able to actually run programs.
This initial version is able to run a very small program that makes
some tiny syscalls, but nothing more.
2020-07-07 22:44:58 +02:00
