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by 0xAX HTML Version: Current License: No License

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0xAX.github.io is a HTML library typically used in Web Site, Blog applications. 0xAX.github.io has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

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0xAX.github.io has a low active ecosystem.

It has 7 star(s) with 1 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

0xAX.github.io has no issues reported. There are no pull requests.

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0xAX.github.io has no bugs reported.

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0xAX.github.io has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

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Community Discussions

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NASM - Macro local label as parameter to another macro

QUESTION

NASM - Macro local label as parameter to another macro

Asked 2019-Mar-09 at 01:36

I am trying to use a macro (as shown in this tutorial) to print a string. The macro PRINT creates local labels to define the string content (str) and length (strlen), and then passes these as parameters to a second macro _syscall_write which makes the syscall.

However running the code fails and I get a Segmentation fault (core dumped) message.

I suspect the problem to be this particular lines, but I don't understand why.

...

ANSWER

Answered 2019-Mar-09 at 01:35

rex.W gs ins is a privileged instruction, and faults in user-space. This is the first instruction of your program, from the expansion of %%str db %1, 0 in your macro without changing sections.

Don't put data where it will be executed as instructions; use section .rodata for read-only data.

GAS would let you do .pushsection .rodata / .popsection to expand the macro correctly inside any section, but for NASM I'm not sure if we can do better than unconditionally switch to section .text after the data.

The NASM preprocessor has %push [optional context-name] / %pop to save/restore preprocessor context, e.g. for nested repeat-until preprocessor stuff. But that's only for the preprocessor, and doesn't include restoring the old section.

Source https://stackoverflow.com/questions/55072277

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