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* 5485 - promote SubX to top-levelKartik Agaram2019-07-271-72/+0
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* 5410 - 4 examples passingKartik Agaram2019-07-171-0/+2
| | | | | Clean up other examples as well to satisfy the requirements in commit 5404.
* switch to new syntax for segment headers in C++Kartik Agaram2019-05-181-1/+1
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* 5102Kartik Agaram2019-04-161-1/+1
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* 5084Kartik Agaram2019-04-111-1/+1
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* 5037Kartik Agaram2019-03-291-1/+1
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* 5011Kartik Agaram2019-03-201-1/+1
| | | | | | | New convention: compare 'with' for asymmetric comparisons (greater or lesser than), and compare 'and' for symmetric comparisons. Worth making this distinction even though the opcodes are identical; when we compare 'with', the order of operands is significant.
* 4981 - no, go back to 3 phasesKartik Agaram2019-02-181-1/+1
| | | | | | | | | | | | | Considering how much trouble a merge phase would be (commit 4978), it seems simpler to just add the extra syntax for controlling the entry point of the generated ELF binary. But I wouldn't have noticed this if I hadn't taken the time to write out the commit messages of 4976 and 4978. Even if we happened to already have linked list primitives built, this may still be a good idea considering that I'm saving quite a lot of code in duplicated entrypoints.
* 4963Kartik Agaram2019-02-141-2/+2
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* 4961Kartik Agaram2019-02-141-1/+0
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* 4893Kartik Agaram2018-12-301-2/+2
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* 4888Kartik Agaram2018-12-291-2/+2
| | | | We only can't use rm32=5 when mod=0. Totally fine when it's mod=1.
* 4881Kartik Agaram2018-12-281-1/+1
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* 4847Kartik Agaram2018-12-061-1/+1
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* 4808 - clean up comments in all subx filesKartik Agaram2018-11-301-6/+5
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* 4802Kartik Agaram2018-11-301-7/+7
| | | | | | | | | | | | | | | | Some automated commenting cleanup. Still needs more careful manual scanning. sed -i 's/^# 1-3/# . 1-3/' *.subx */*.subx sed -i 's/^# op/# . op/' *.subx */*.subx sed -i 's/# vim/# . . vim/' *.subx */*.subx sed -i 's/^ # push args/ # . . push args/' *.subx */*.subx sed -i 's/^ # discard args/ # . . discard args/' *.subx */*.subx sed -i 's/^ # call/ # . . call/' *.subx */*.subx sed -i 's/^ # prolog/ # . prolog/' *.subx */*.subx sed -i 's/^ # epilog/ # . epilog/' *.subx */*.subx sed -i 's/^ # save registers/ # . save registers/' *.subx */*.subx sed -i 's/^ # restore registers/ # . restore registers/' *.subx */*.subx sed -i 's/ operand / register /' *.subx */*.subx
* 4801Kartik Agaram2018-11-301-37/+37
| | | | Reindent all SubX code to make some room for the new comment style.
* 4668Kartik Agaram2018-10-051-5/+5
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* 4667Kartik Agaram2018-10-051-11/+12
| | | | | Standardize on hyphens in all names. And we'll use colons for namespacing labels in functions.
* 4662Kartik Agaram2018-10-051-0/+2
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* 4644Kartik Agaram2018-10-011-5/+5
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* 4639Kartik Agaram2018-10-011-3/+3
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* 4624Kartik Agaram2018-09-301-1/+1
| | | | | | | | Start requiring a '-o' flag to designate the output binary when translating. Things currently get funky if you pass in multiple inputs, but that's ok. This is the first step to supporting multiple input files for a single output binary.
* 4516Kartik K. Agaram2018-09-241-10/+9
| | | | | | | More calling convention tweaks. Use EBP to get consistently at parameters and locals. Always put the first function argument closest to EBP.
* 4591Kartik Agaram2018-09-221-2/+2
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* 4585Kartik Agaram2018-09-211-72/+0
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* 4584 - discrepancy between SubX and native x86Kartik Agaram2018-09-211-1/+76
| | | | | | | | | | | | | | | | | | | | | | | | | One of the more painful things I had to debug with machine code. Tricks I used can be seen in ex10.subx: - printing argv[1] in various places - printing a single 'X' in various places to count how many times we get to different instructions - exiting with the current value of EAX in various places I repeatedly went down the wrong trail in several ways: - forgetting that the problem lay in native runs, and accidentally switching to subx runs during debugging. - forgetting to pass commandline args, because ex10 doesn't check its argv - writing the wrong comment for an instruction, and then miscalculating the set of registers that need to be saved. - forgetting that syscalls clobber EAX. Debugging native runs is hard, because you have to write non-trivial code to instrument the binary, and instrumentation can itself be buggy. When we finally tracked it down, I recognized the problem immediately. I'd meant to confirm the behavior of opcode 8a against bare metal, and then forgot. In any case, opcode 8a was inconsistent with 88. Sloppy.
* 4583Kartik Agaram2018-09-211-1/+1
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* 4581Kartik Agaram2018-09-211-1/+1
| | | | | | | | | | | | Even more cuddling. We want to keep lines short where the opcode and operands are self-explanatory. If there are any implicit registers, etc., we'll continue to do the table layout. The first two columns look messy now; let's see how this goes. Maybe I'll give up on the tabular layout altogether, just string args with a single space.
* 4579Kartik Agaram2018-09-211-0/+67
New example program: ascii null-terminated string comparison I'd hoped this would be a stepping stone to supporting general ascii comparison, but we're planning to use size-prefixed rather than null-terminated arrays everywhere. The only exception is commandline arguments, which will remain null-terminated to interoperate with Linux. So I'm going to need separate functions for "compare with argv" and for general string comparison.
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