71e4f38129
Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.
So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.
A couple of things have gotten dropped in this process:
- I had old ways to run on just a Linux kernel, or with a Soso kernel.
No more.
- I had some old tooling for running a single test at the cursor. I haven't
used that lately. Maybe I'll bring it back one day.
The reorg isn't done yet. Still to do:
- redo documentation everywhere. All the README files, all other markdown,
particularly vocabulary.md.
- clean up how-to-run comments at the start of programs everywhere
- rethink what to do with the html/ directory. Do we even want to keep
supporting it?
In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.
39 lines
859 B
C++
39 lines
859 B
C++
//: helper for division operations: sign-extend EAX into EDX
|
|
|
|
:(before "End Initialize Op Names")
|
|
put_new(Name, "99", "sign-extend EAX into EDX (cdq)");
|
|
|
|
:(code)
|
|
void test_cdq() {
|
|
Reg[EAX].i = 10;
|
|
run(
|
|
"== code 0x1\n"
|
|
"99\n"
|
|
);
|
|
CHECK_TRACE_CONTENTS(
|
|
"run: sign-extend EAX into EDX\n"
|
|
"run: EDX is now 0x00000000\n"
|
|
);
|
|
}
|
|
|
|
:(before "End Single-Byte Opcodes")
|
|
case 0x99: { // sign-extend EAX into EDX
|
|
trace(Callstack_depth+1, "run") << "sign-extend EAX into EDX" << end();
|
|
Reg[EDX].i = (Reg[EAX].i < 0) ? -1 : 0;
|
|
trace(Callstack_depth+1, "run") << "EDX is now 0x" << HEXWORD << Reg[EDX].u << end();
|
|
break;
|
|
}
|
|
|
|
:(code)
|
|
void test_cdq_negative() {
|
|
Reg[EAX].i = -10;
|
|
run(
|
|
"== code 0x1\n"
|
|
"99\n"
|
|
);
|
|
CHECK_TRACE_CONTENTS(
|
|
"run: sign-extend EAX into EDX\n"
|
|
"run: EDX is now 0xffffffff\n"
|
|
);
|
|
}
|