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POWhat are the origins and contents of .tramp sections?
 

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  1. POWhat are the origins and contents of .tramp sections?
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    <p>I understand that they contain <a href="http://en.wikipedia.org/wiki/Trampoline_%28computers%29" rel="nofollow">trampolines</a>. Are the trampolines created by the compiler or the linker? What is the format of the section (it doesn't appear to be code. objdump -d fails to disassemble it.)? </p> <p>Is there some option to suppress their creation?</p> <pre><code> Nr Name Type Addr Off Size ES Flg Lk Inf Al 16 .tramp PROGBITS 0xxxxxxx 0xxxxx 0000xx 00 A 0 0 4 </code></pre> <p>I couldn't find anything in the <a href="http://flint.cs.yale.edu/cs422/doc/ELF_Format.pdf" rel="nofollow">ELF spec</a>.</p> <p><strong>Edit 2012.01.30:</strong></p> <p>A little more intelligence on the issue. The code is generated by the MaxAda compiler (ver 3.5.1) and is somehow connected to the Ada Runtime. </p> <p>The only symbol to reference the .tramp section is </p> <pre><code>4379: 080xxxxx 0 OBJECT GLOBAL DEFAULT 16 A$rts_bounce_list </code></pre> <p>Built a linker map file and discovered that the symbol originated in:</p> <pre><code>/usr/ada/i86_3.5.1/lib/libruntime.bart.a(bounce.red_hat.o) /usr/ada/i86_3.5.1/lib/libruntime.bart.a(ada.rts.elaboration.runtimeB) (A$rts_bounce_list) </code></pre> <p>A hex dump of the section (objdump) yields:</p> <pre><code>Contents of section .tramp: 80xxxa8 01000000 90e70708 22e80708 01000000 ........"....... 80xxxb8 24e80708 17eb0708 01000000 4cec0708 $...........L... 80xxxc8 4cee0708 01000000 4cee0708 c2f00708 L.......L....... 80xxxd8 01000000 701d0808 1f1e0808 01000000 ....p........... 80xxxe8 70400808 c6410808 02000000 ac960808 p@...A.......... 80xxxf8 00000000 02000000 00000000 00000000 ................ 80xxy08 02000000 00000000 00000000 03000000 ................ 80xxy18 66400808 01000000 02000000 349d0808 f@..........4... 80xxy28 00000000 02000000 00000000 00000000 ................ </code></pre> <p>The manual is thoroughly unhelpful:</p> <pre><code>Pragma TRAMPOLINE NOTE : Pragma TRAMPOLINE is reserved for internal MAXAda use only; it is not intended for use in user-defined code. </code></pre>
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    1. COYou may need to go to the vendor for this one. I've been working with Ada for almost 30 years and had never heard of MAXAda. Or try comp.lang.ada.
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