RGBCube/serenity
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127 commits

Author SHA1 Message Date
Andreas Kling
6a926a8c61 LibX86+UserspaceEmulator: Don't store a32 in MemoryOrRegisterReference 
The a32 bit tells us whether a memory address is 32-bit or not.
We already have this information in Instruction, so just plumb that
around instead of double-caching the bit.
 2020-07-15 13:42:15 +02:00
Andreas Kling
f608b9d89a UserspaceEmulator: Mark some generic instructions ALWAYS_INLINE :^) 2020-07-13 20:47:45 +02:00
Andreas Kling
2f81c20002 UserspaceEmulator: Move the SoftCPU stream virtuals to the header 
They don't actually get inlined yet, but at least this devirtualizes
them which is nice.
 2020-07-13 20:41:48 +02:00
Andreas Kling
a27473cbc2 UserspaceEmulator+LibX86: Turn on -O3 optimization for emulation code 
Since this code is performance-sensitive, let's have the compiler do
whatever it can to help us with the most important files.

This yields a ~8% speedup.
 2020-07-13 20:23:00 +02:00
Andreas Kling
8656835935 UserspaceEmulator: Add a very simple instruction fetch cache 
To avoid MMU region lookup on every single instruction fetch, we now
cache a raw pointer to the current instruction. This gets automatically
invalidated when we jump somewhere, but as long as we're executing
sequentially, instruction fetches will hit the cache and bypass all
the region lookup stuff.

This is about a ~2x speedup. :^)
 2020-07-13 20:14:14 +02:00
Andreas Kling
a83fe7f82d UserspaceEmulator: Add the POPFD instruction 
I'm not sure the mask I'm using here is completely correct, but it's
not terribly important since we're a userspace-only emulator anyway.
 2020-07-13 13:50:22 +02:00
Andreas Kling
dba6f9b24b UserspaceEmulator: Add the NOT instruction (with bonus: NOP!) 2020-07-13 13:50:22 +02:00
Andreas Kling
5ecbfd8451 UserspaceEmulator: Add the STC/CLC and STD/CLD instructions 2020-07-13 13:50:22 +02:00
Andreas Kling
9f293054e8 UserspaceEmulator: Implement the ADC instruction 2020-07-13 13:50:22 +02:00
Andreas Kling
6230c60296 UserspaceEmulator: Make SBB actually respect the SoftCPU carry flag 
We were forgetting to set the host CPU's carry flag before executing
the SBB instruction. This made the result a bit unpredictable. :^)
 2020-07-13 13:50:22 +02:00
Andreas Kling
a9f92e5d75 UserspaceEmulator: Remove an unnecessary step in some instructions 
We don't need to move the result of shifts around like this, we can
just use inline assembly outputs to make it end up in the right place.
 2020-07-13 13:50:22 +02:00
Andreas Kling
80d3306840 UserspaceEmulator: Fix wrong ESI/EDI step sizes in MOVSW and MOVSD 2020-07-13 13:50:22 +02:00
Andreas Kling
63d3f5d19b UserspaceEmulator: Implement the PUSHFD instruction 2020-07-13 13:50:22 +02:00
Andreas Kling
079021a607 UserspaceEmulator: Put the executable name in argv[0] :^) 
The emulated program can now find its own name in argv[0]. Very cool!
 2020-07-12 21:37:54 +02:00
Andreas Kling
e461e3c8b0 UserspaceEmulator: Fix missing sign extension in PUSH_imm8 2020-07-12 17:44:14 +02:00
Andreas Kling
274ac3c628 UserspaceEmulator: Implement the XADD instruction 2020-07-12 15:35:01 +02:00
Andreas Kling
04695957e2 UserspaceEmulator: Implement the MOVSX instruction 2020-07-12 15:33:29 +02:00
Andreas Kling
8940916232 UserspaceEmulator: Implement JMP_RM32 2020-07-12 14:54:30 +02:00
Andreas Kling
a424208399 UserspaceEmulator: Implement DIV_RM32 
Not using inline assembly for this one since flags are undefined after
a DIV instruction anyway.
 2020-07-12 14:53:19 +02:00
Andreas Kling
062e2f8614 UserspaceEmulator: Implement the XCHG instruction 2020-07-12 14:45:46 +02:00
Andreas Kling
536ca0f8c9 UserspaceEmulator: Implement some more MOV variants 2020-07-12 14:45:35 +02:00
Andreas Kling
2d44f4526a UserspaceEmulator: Implement MOVSB/MOVSW/MOVSD 2020-07-12 14:45:02 +02:00
Andreas Kling
ed57efff4f UserspaceEmulator: Implement the CMPXCHG instruction 2020-07-12 14:43:30 +02:00
Andreas Kling
6ec0a63af1 UserspaceEmulator: Fix broken MOV_RM8_reg8 2020-07-12 14:42:15 +02:00
Andreas Kling
bdf72a7c7a UserspaceEmulator: Implement JMP_NEAR_imm 
This is a full-width relative jump, when the 8-bit immediate variant
isn't large enough.
 2020-07-12 01:36:45 +02:00
Andreas Kling
938a00ecf9 UserspaceEmulator: Implement the CMOVcc instruction 2020-07-12 01:36:45 +02:00
Andreas Kling
adf3775955 UserspaceEmulator: Implement the SBB family of instructions 2020-07-12 01:36:45 +02:00
Andreas Kling
734f63d522 UserspaceEmulator: Add basic TLS (thread-local storage) support 
The SoftMMU now receives full X86::LogicalAddress values from SoftCPU.
This allows the MMU to reroute TLS accesses to a special memory region.

The ELF executable's PT_TLS header tells us how to allocate the TLS.

Basically, the GS register points to a magical 4-byte area which has
a pointer to the TCB (thread control block). The TCB lives in normal
flat memory space and is accessed through the DS register.
 2020-07-12 01:36:45 +02:00
Andreas Kling
df95e25eaa UserspaceEmulator: Implement the NEG instruction 
Per the Intel manuals, NEG is equivalent to subtracting a value from 0.
 2020-07-12 01:36:45 +02:00
Andreas Kling
aa13183615 UserspaceEmulator: Implement SETcc_RM8 2020-07-12 01:36:45 +02:00
Andreas Kling
b524bc123d UserspaceEmulator: Implement the DEC family of instructions 2020-07-12 01:36:45 +02:00
Andreas Kling
8a94622e54 UserspaceEmulator: Put memory read/write logging behind MEMORY_DEBUG 2020-07-11 23:57:14 +02:00
Andreas Kling
775bc158ba UserspaceEmulator: Implement the SHL family of instructions 2020-07-11 23:57:14 +02:00
Andreas Kling
bfacb9583a UserspaceEmulator: Implement RET_imm16 
This is just like RET, but it also pops N bytes off the stack.
 2020-07-11 23:57:14 +02:00
Andreas Kling
eb86264d3b UserspaceEmulator: Simplify op_foo templates 
Instead of templatizing both the destination and source types, simply
templatize the operand type and sign-extend narrower source values at
the call sites instead.
 2020-07-11 23:57:14 +02:00
Andreas Kling
6febad1ef3 UserspaceEmulator: The generic_RM*_imm8 functions need to sign extend 
We are supposed to sign-extend the 8-bit immediate here,
"cmp eax, 0xff" is actually "cmp eax, 0xffffffff"
 2020-07-11 23:57:14 +02:00
Andreas Kling
21837544bb UserspaceEmulator: Implement MOV_EAX_moff32 2020-07-11 23:57:14 +02:00
Andreas Kling
1579cbdc9d UserspaceEmulator: Implement CALL_RM32 2020-07-11 23:57:14 +02:00
Andreas Kling
a6719ede0b UserspaceEmulator: Implement the SHR family of instructions 2020-07-11 23:57:14 +02:00
Andreas Kling
2ee451afed UserspaceEmulator: Implement SHR_RM32_imm8 2020-07-11 23:57:14 +02:00
Andreas Kling
d79f15e219 UserspaceEmulator: Implement the OR family of instructions 2020-07-11 23:57:14 +02:00
Andreas Kling
cb2e36dde7 UserspaceEmulator: Implement PUSH_imm8 
Curiously, the 8-bit immediate is sign-extended.
 2020-07-11 23:57:14 +02:00
Andreas Kling
ab9c7ef63b UserspaceEmulator: Fix broken MOV_RM32_imm32 
Oops, this was incorrectly moving into a GPR rather than the R/M.
 2020-07-11 23:57:14 +02:00
Andreas Kling
6c7ae794ce UserspaceEmulator: Implement the 32-bit LEAVE instruction 
The 16-bit variant is a bit weird. Let's wait until someone needs it.
 2020-07-11 23:57:14 +02:00
Andreas Kling
321ee72fe7 UserspaceEmulator: Implement JMP_imm16 and JMP_imm32 2020-07-11 23:57:14 +02:00
Andreas Kling
12566b9df0 UserspaceEmulator: Implement the MOVZX instruction 2020-07-11 23:57:14 +02:00
Andreas Kling
0af485dfff UserspaceEmulator: Implement STOSB/STOSW/STOSD 
...and add a template to handle REP* instruction prefixes. This can be
further generalized, but let's go one step at a time.
 2020-07-11 23:57:14 +02:00
Andreas Kling
6688ce41b2 UserspaceEmulator: Implement some of the IMUL instruction family 
The single-operand forms of IMUL are a little weird. We can deal with
them when they actually show up.
 2020-07-11 23:57:14 +02:00
Andreas Kling
97f4cebc8d UserspaceEmulator+LibX86: Implement the LEA instruction 
This piggybacks nicely on Instruction's ModR/M resolution code. :^)
 2020-07-11 23:57:14 +02:00
Andreas Kling
b094e5279c UserspaceEmulator: Both ADD and SUB modify the carry flag 2020-07-11 20:10:30 +02:00