c48ce3c8bf
At the SubX level we have to put up with null-terminated kernel strings for commandline args. But so far we haven't done much with them. Rather than try to support them we'll just convert them transparently to standard length-prefixed strings. In the process I realized that it's not quite right to treat the combination of argc and argv as an array of kernel strings. Argc counts the number of elements, whereas the length of an array is usually denominated in bytes.
38 lines
940 B
Plaintext
38 lines
940 B
Plaintext
# Just a test stub for mu-init.subx
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#
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# Try it out like this:
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# $ ./translate_subx init.linux [0-9]*.subx mu-init.subx mu-init-test.subx
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# $ ./a.elf # should run all tests
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main: # args: (addr array (addr array byte)) -> result/ebx: int
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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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56/push-esi
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# esi = args
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8b/-> *(ebp+8) 6/r32/esi
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{
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# if (argc <= 1) break
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81 7/subop/compare *esi 4/imm32
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7e/jump-if-<= break/disp8
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# if (argv[1] != "test") break
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(string-equal? *(esi+8) "test") # => eax
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3d/compare-eax-and 0/imm32
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74/jump-if-= break/disp8
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#
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(run-tests)
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# return *Num-test-failures
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8b/-> *Num-test-failures 3/r32/ebx
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eb/jump $main:end/disp8
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}
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$main:end:
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# . restore registers
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5e/pop-to-esi
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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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