2020-11-18 02:14:43 +00:00
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# Helper to check an array's bounds, and to abort if they're violated.
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# Really only intended to be called from code generated by mu.subx.
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== code
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__check-mu-array-bounds: # index: int, elem-size: int, arr-size: int, function-name: (addr array byte), array-name: (addr array byte)
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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51/push-ecx
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52/push-edx
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# . not bothering saving ebx; it's only clobbered if we're going to abort
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# ecx = arr-size
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8b/-> *(ebp+0x10) 1/r32/ecx
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# var overflow/edx: int = 0
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ba/copy-to-edx 0/imm32
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# var offset/eax: int = index * elem-size
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8b/-> *(ebp+8) 0/r32/eax
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f7 4/subop/multiply-eax-with *(ebp+0xc)
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# check for overflow
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81 7/subop/compare %edx 0/imm32
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0f 85/jump-if-!= __check-mu-array-bounds:overflow/disp32
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# check bounds
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39/compare %eax 1/r32/ecx
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0f 82/jump-if-unsigned< $__check-mu-array-bounds:end/disp32 # negative index should always abort
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# abort if necessary
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7842 - new directory organization
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.
2021-03-04 06:09:50 +00:00
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "fn " 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebp+0x14) 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 ": offset " 3 0) # 3=cyan
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(draw-int32-hex-wrapping-right-then-down-from-cursor-over-full-screen 0 %eax 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " is too large for array '" 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebp+0x18) 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "'" 3 0) # 3=cyan
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2021-05-18 17:23:54 +00:00
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(abort "")
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2021-01-16 05:36:25 +00:00
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# never gets here
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2020-11-18 02:14:43 +00:00
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$__check-mu-array-bounds:end:
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# . restore registers
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5a/pop-to-edx
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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__check-mu-array-bounds:overflow:
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7842 - new directory organization
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.
2021-03-04 06:09:50 +00:00
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "fn " 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebp+0x14) 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 ": offset to array '" 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebp+0x18) 3 0) # 3=cyan
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "' overflowed 32 bits" 3 0) # 3=cyan
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2021-05-18 17:23:54 +00:00
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(abort "")
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2021-01-16 05:36:25 +00:00
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# never gets here
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2021-05-08 01:25:43 +00:00
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2021-05-08 04:04:45 +00:00
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__mu-abort-null-index-base-address:
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(abort "null address in 'index'")
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2021-05-08 01:25:43 +00:00
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__mu-abort-null-get-base-address:
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(abort "null address in 'get'")
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