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PORecursive assembly Call though no recursion in source code
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  1. PORecursive assembly Call though no recursion in source code
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    copied!<p>I have a code fragment from a dump which I want to understand. What bothers me most, are the (seemingly) recursive calls like </p> <p>bd604: e8 fc ff ff ff call bd605 + 0xb5</p> <p>What do they do? I don't use recursion in the original function.</p> <blockquote> <p>Thanks@schnaader</p> <p>it seems as if the calls make cld and jump to EAX</p> </blockquote> <p>EDIT: full dmp of my function</p> <pre><code>00bd550 &lt;SendData&gt;: SendData(): bd550: 55 push %ebp bd551: 57 push %edi bd552: 56 push %esi bd553: 53 push %ebx bd554: 83 ec 20 sub $0x20,%esp bd557: 8b 35 74 a2 06 00 mov 0x6a274,%esi bd55d: 8b 1d ac a2 06 00 mov 0x6a2ac,%ebx bd563: dd 44 24 40 fldl 0x40(%esp,1) bd567: 66 c7 44 24 0e 00 00 movw $0x0,0xe(%esp,1) bd56e: 83 eb 18 sub $0x18,%ebx bd571: 85 f6 test %esi,%esi bd573: dd 5c 24 18 fstpl 0x18(%esp,1) bd577: dd 44 24 48 fldl 0x48(%esp,1) bd57b: dd 5c 24 10 fstpl 0x10(%esp,1) bd57f: 0f 85 b2 00 00 00 jne bd637 &lt;SendData+0xe7&gt; bd585: 8b 7c 24 38 mov 0x38(%esp,1),%edi bd589: 89 dd mov %ebx,%ebp bd58b: c1 fd 02 sar $0x2,%ebp bd58e: 85 ff test %edi,%edi bd590: 0f 8e 99 00 00 00 jle bd62f &lt;SendData+0xdf&gt; bd596: 8d 76 00 lea 0x0(%esi),%esi bd599: 8d bc 27 00 00 00 00 lea 0x0(%edi,1),%edi bd5a0: 0f b7 74 24 0e movzwl 0xe(%esp,1),%esi bd5a5: 39 ef cmp %ebp,%edi bd5a7: 89 e8 mov %ebp,%eax bd5a9: 0f 4e c7 cmovle %edi,%eax bd5ac: dd 44 24 18 fldl 0x18(%esp,1) bd5b0: 89 c5 mov %eax,%ebp bd5b2: 8d 1c ad 00 00 00 00 lea 0x0(,%ebp,4),%ebx bd5b9: 29 ef sub %ebp,%edi bd5bb: 01 c6 add %eax,%esi bd5bd: a1 a8 a2 06 00 mov 0x6a2a8,%eax bd5c2: 8d 56 ff lea 0xffffffff(%esi),%edx bd5c5: dd 58 08 fstpl 0x8(%eax) bd5c8: 66 89 50 06 mov %dx,0x6(%eax) bd5cc: 0f b7 54 24 0e movzwl 0xe(%esp,1),%edx bd5d1: 66 89 50 04 mov %dx,0x4(%eax) bd5d5: 8b 54 24 3c mov 0x3c(%esp,1),%edx bd5d9: 89 10 mov %edx,(%eax) bd5db: dd 44 24 10 fldl 0x10(%esp,1) bd5df: dd 58 10 fstpl 0x10(%eax) bd5e2: 8b 54 24 34 mov 0x34(%esp,1),%edx bd5e6: 0f bf 44 24 0e movswl 0xe(%esp,1),%eax bd5eb: 89 5c 24 08 mov %ebx,0x8(%esp,1) bd5ef: 83 c3 18 add $0x18,%ebx bd5f2: 8d 04 82 lea (%edx,%eax,4),%eax bd5f5: 89 44 24 04 mov %eax,0x4(%esp,1) bd5f9: a1 a8 a2 06 00 mov 0x6a2a8,%eax bd5fe: 83 c0 18 add $0x18,%eax bd601: 89 04 24 mov %eax,(%esp,1) bd604: e8 fc ff ff ff call bd605 &lt;SendData+0xb5&gt; bd609: a1 a8 a2 06 00 mov 0x6a2a8,%eax bd60e: c7 44 24 08 00 00 00 movl $0x0,0x8(%esp,1) bd615: 00 bd616: 89 5c 24 04 mov %ebx,0x4(%esp,1) bd61a: 89 04 24 mov %eax,(%esp,1) bd61d: e8 fc ff ff ff call bd61e &lt;SendData+0xce&gt; bd622: 85 ff test %edi,%edi bd624: 66 89 74 24 0e mov %si,0xe(%esp,1) bd629: 0f 8f 71 ff ff ff jg bd5a0 &lt;SendData+0x50&gt; bd62f: 83 c4 20 add $0x20,%esp bd632: 5b pop %ebx bd633: 5e pop %esi bd634: 5f pop %edi bd635: 5d pop %ebp bd636: c3 ret bd637: dd 44 24 18 fldl 0x18(%esp,1) bd63b: dd 1c 24 fstpl (%esp,1) bd63e: e8 fc ff ff ff call bd63f &lt;SendData+0xef&gt; bd643: 85 c0 test %eax,%eax bd645: 74 e8 je bd62f &lt;SendData+0xdf&gt; bd647: e9 39 ff ff ff jmp bd585 &lt;SendData+0x35&gt; bd64c: 8d 74 26 00 lea 0x0(%esi,1),%esi </code></pre>
 

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