Memory Map (S390): Difference between revisions
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m (Bot: Replace deprecated source tag with syntaxhighlight) |
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== Detecting memory == |
== Detecting memory == |
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< |
<syntaxhighlight lang="c"> |
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/* We are going to read in pairs of 1MiB and when we hit the memory limit we |
/* We are going to read in pairs of 1MiB and when we hit the memory limit we |
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* will instantly catch the program exception and stop counting, then it's just |
* will instantly catch the program exception and stop counting, then it's just |
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return (size_t)probe; |
return (size_t)probe; |
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} |
} |
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</syntaxhighlight> |
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</source> |
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Now there needs to be a function to "catch" the exceptions recognized by the processor: |
Now there needs to be a function to "catch" the exceptions recognized by the processor: |
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< |
<syntaxhighlight lang="c"> |
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/* Check if an address is valid - this only catches program exceptions to |
/* Check if an address is valid - this only catches program exceptions to |
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* determine if it's valid or not */ |
* determine if it's valid or not */ |
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return r; |
return r; |
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} |
} |
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</syntaxhighlight> |
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</source> |
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Some C compilers are known to crash or even ABEND during compilation if addresses of labels are taken via the && operator, alternatively using direct high-level assembler syntax: |
Some C compilers are known to crash or even ABEND during compilation if addresses of labels are taken via the && operator, alternatively using direct high-level assembler syntax: |
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< |
<syntaxhighlight lang="asm"> |
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* HwCheckAddress |
* HwCheckAddress |
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* IN: |
* IN: |
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DC A(AMBIT+CATCHPCR) |
DC A(AMBIT+CATCHPCR) |
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TMPSAVE DS 1D |
TMPSAVE DS 1D |
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</syntaxhighlight> |
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</source> |
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== See also === |
== See also === |
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