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mu/linux/ex5.subx

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4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# Read a character from stdin, save it to a local on the stack, write it to stdout.
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#
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# To run:
.
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# $ bootstrap/bootstrap translate ex5.subx -o ex5
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# $ bootstrap/bootstrap run ex5
4363 - subx: first program using the stack segment We allocate space for a local variable, read() a character from stdin to it, and write() it out to stdout.
2018-07-17 05:18:18 +00:00
5647 - experimental support for swapping OS
2019-09-12 02:04:49 +00:00
== code
4802 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
2018-11-30 19:10:44 +00:00
# instruction effective address register displacement immediate
# . op subop mod rm32 base index scale r32
# . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes
4363 - subx: first program using the stack segment We allocate space for a local variable, read() a character from stdin to it, and write() it out to stdout.
2018-07-17 05:18:18 +00:00
4981 - no, go back to 3 phases 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.
2019-02-19 05:48:19 +00:00
Entry:
4801 Reindent all SubX code to make some room for the new comment style.
2018-11-30 18:54:42 +00:00
# allocate x on the stack
5592 - switch register names to lowercase
2019-08-26 18:55:26 +00:00
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # subtract from esp
4363 - subx: first program using the stack segment We allocate space for a local variable, read() a character from stdin to it, and write() it out to stdout.
2018-07-17 05:18:18 +00:00
5647 - experimental support for swapping OS
2019-09-12 02:04:49 +00:00
# read(stdin, x, 1)
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . fd = 0 (stdin)
5592 - switch register names to lowercase
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bb/copy-to-ebx 0/imm32
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . data = x (location to write result to)
5592 - switch register names to lowercase
2019-08-26 18:55:26 +00:00
8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 . # copy esp+4 to ecx
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . size = 1 character
5592 - switch register names to lowercase
2019-08-26 18:55:26 +00:00
ba/copy-to-edx 1/imm32
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . syscall
5647 - experimental support for swapping OS
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e8/call syscall_read/disp32
4363 - subx: first program using the stack segment We allocate space for a local variable, read() a character from stdin to it, and write() it out to stdout.
2018-07-17 05:18:18 +00:00
4801 Reindent all SubX code to make some room for the new comment style.
2018-11-30 18:54:42 +00:00
# syscall(write, stdout, x, 1)
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . fd = 1 (stdout)
5592 - switch register names to lowercase
2019-08-26 18:55:26 +00:00
bb/copy-to-ebx 1/imm32
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . data = x (location to read from)
5592 - switch register names to lowercase
2019-08-26 18:55:26 +00:00
8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 . # copy esp+4 to ecx
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . size = 1 character
5592 - switch register names to lowercase
2019-08-26 18:55:26 +00:00
ba/copy-to-edx 1/imm32
4808 - clean up comments in all subx files
2018-12-01 00:45:15 +00:00
# . syscall
6507 - use syscall names everywhere
2020-06-11 06:09:30 +00:00
e8/call syscall_write/disp32
4363 - subx: first program using the stack segment We allocate space for a local variable, read() a character from stdin to it, and write() it out to stdout.
2018-07-17 05:18:18 +00:00
5647 - experimental support for swapping OS
2019-09-12 02:04:49 +00:00
# exit(ebx)
e8/call syscall_exit/disp32
5410 - 4 examples passing Clean up other examples as well to satisfy the requirements in commit 5404.
2019-07-17 07:47:11 +00:00
4802 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
2018-11-30 19:10:44 +00:00
# . . vim:nowrap:textwidth=0