<html><head><base href="x-msg://61/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; 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line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><span class="Apple-style-span" style="font-size: medium; ">On 24 Nov 2009, at 06:05, Jay K wrote:</span></div></span></span></span></span></span></span></span></span></div></span></span></div><div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; ">Tony,<br> <br>Does this seem correct?<br> <br><span lang="EN">PROCEDURE SignalHandler (sig: int) =<br>VAR<br>...<br>old:<br> <br>me.sp := SaveRegsInStack();<br>IF me.sp = NIL THEN me.sp := ADR(xx) END;<br>new:<br> <br>SaveRegsInStack(); (* no return value *)<br>me.sp := ADR(xx); (* unconditional *)<br></span></div></span></blockquote><div><br></div><div>No. The sp back from SaveRegsInStack may capture more state than ADR(xx).</div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; "> <br> <br> <br><span lang="EN">void ThreadPThread__SaveRegsInStack(void)<br>{<br>#ifdef M3_REGISTER_WINDOWS<br>/* On "register window" architectures, setjmp/longjmp tends<br>to flush registers to the stack in a fairly portable not<br>too inefficient fashion, and saves us the need for<br>gnarly assembly. (ta 3 on Sparc, flushrs on IA64)<br>*/<br>jmp_buf jb;<br>if (setjmp(jb) == 0) longjmp(jb, 1);<br>#endif<br>}<br></span> <br> <br>You know -- was the stack pointer returned by SaveRegsInStack before really better/different than just ADR(xx)?<br> <br> <br>Consider:<br> <br># if defined(__arch64__) || defined(__sparcv9)<br> asm(" save %sp,-128,%sp");<br> asm(" flushw");<br> asm(" ret");<br> asm(" restore %sp,2047+128,%o0");<br># else<br>asm(" ta 0x3 ! ST_FLUSH_WINDOWS");<br> asm(" retl");<br> asm(" mov %sp,%o0");<br># endif<br> <br> <br>on 32bit, it just returns the unchanged %sp of its caller.<br>On 64bit, I suspect kind of the same thing, though I don't know what the 128 or 2047 are. 2047 is probably some "bias" builtin to the register and 128 I guess is required for flushw??<br> <br> <br> - Jay<br><br><br><br></div></span></blockquote></div><br></body></html>