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| author | rsc <devnull@localhost> | 2005-01-14 17:37:50 +0000 |
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| committer | rsc <devnull@localhost> | 2005-01-14 17:37:50 +0000 |
| commit | adc93f6097615f16d57e8a24a256302f2144ec4e (patch) | |
| tree | e190b0616aa060c646d62de835babf8396d36ccd /man/man3/mach-stack.html | |
| parent | 1ac1981659ba7abcc1c76436e4b4dfc2bc616d2a (diff) | |
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cut out the html - they're going to cause diffing problems.
Diffstat (limited to 'man/man3/mach-stack.html')
| -rw-r--r-- | man/man3/mach-stack.html | 232 |
1 files changed, 0 insertions, 232 deletions
diff --git a/man/man3/mach-stack.html b/man/man3/mach-stack.html deleted file mode 100644 index d08258bd..00000000 --- a/man/man3/mach-stack.html +++ /dev/null @@ -1,232 +0,0 @@ -<head> -<title>mach-stack(3) - Plan 9 from User Space</title> -<meta content="text/html; charset=utf-8" http-equiv=Content-Type> -</head> -<body bgcolor=#ffffff> -<table border=0 cellpadding=0 cellspacing=0 width=100%> -<tr height=10><td> -<tr><td width=20><td> -<tr><td width=20><td><b>MACH-STACK(3)</b><td align=right><b>MACH-STACK(3)</b> -<tr><td width=20><td colspan=2> - <br> -<p><font size=+1><b>NAME </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - stacktrace, localaddr, unwindframe, windindex, windreglocs – stack - traces<br> - -</table> -<p><font size=+1><b>SYNOPSIS </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - <tt><font size=+1>#include <u.h><br> - #include <libc.h><br> - #include <mach.h> - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - </font></tt> - int stacktrace(Map *map, Rgetter rget, Tracer trace) - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - int localaddr(Map *map, Regs *regs, char *fn, char *val, ulong - *val) - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - int unwindframe(Map *map, Regs *regs, ulong *next, Symbol *sym) - - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - int windindex(char *regname) - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - Loc* windreglocs(void)<br> - -</table> -<p><font size=+1><b>DESCRIPTION </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - <i>Stacktrace</i> provides machine-independent implementations of process - stack traces. They must retrieve data and register contents from - an executing image. Sometimes the desired registers are not the - current registers but rather a set of saved registers stored elsewhere - in memory. The caller may specify an initial - register set in the form of an <i>Rgetter</i> function, of the form - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - <tt><font size=+1>ulong rget(Map *map, char *name)<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - </font></tt> - - </table> - It returns the contents of a register when given a map and a register - name. It is usually sufficient for the register function to return - meaningful values only for <tt><font size=+1>SP</font></tt> and <tt><font size=+1>PC</font></tt>, and for the link register - (usually <tt><font size=+1>LR</font></tt>) on CISC machines. - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - Given the map and the rgetter, <i>stacktrace</i> unwinds the stack starting - at the innermost function. At each level in the trace, it calls - the tracer function, which has the form - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - <tt><font size=+1>int trace(Map *map, ulong pc, ulong callerpc,<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - Rgetter rget, Symbol *s)<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - </table> - </font></tt> - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - - - </table> - - </table> - The tracer is passed the map, the current program counter, the - program counter of the caller (zero if the caller is unknown), - a new <i>rget</i> function, and a symbol (see <a href="../man3/mach-symbol.html"><i>mach-symbol</i>(3)</a>) describing - the current function (nil if no symbol is known). The value returned - by the tracer controls whether the stack trace continues: a - zero or negative return value stops the trace, while a positive - return value continues it. - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - The rgetter passed to the tracer is not the rgetter passed to - <tt><font size=+1>stacktrace</font></tt> itself. Instead, it is a function returning the register - values at the time of the call, to the extent that they can be - reconstructed. The most common use for this rgetter is as an argument - to <i>lget4</i>, etc., when evaluating the locations of local - variables. - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - <i>Localaddr</i> uses <i>stacktrace</i> to walk up the stack looking for the - innermost instance of a function named <i>fn ;</i> once it finds the - function, it looks for the parameter or local variable <i>var</i>, storing - the address of the variable in <i>val</i>. - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - <i>Unwindframe</i> is the low-level function on which <i>stacktrace</i> is built. - Given the current memory image in <i>map</i> and the current register - set in <i>regs , unwindframe</i> fills in <i>next</i> with the values of the - register set at the time of the call to the function in the current - program counter. <i>Sym</i> should be the symbol corresponding to - the current function, if available. - <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> - - The <i>next</i> array holds only the <i>winding registers</i>, typically the - caller-save registers and the program counter and stack pointer. - The order of registers in the array is called the <i>winding order</i>. - The winding set can be found in the array <i>mach</i><tt><font size=+1>−></font></tt><i>windreg</i>, which - has <i>mach</i><tt><font size=+1>−></font></tt><i>nwindreg</i> entries. <i>Windindex</i> returns the index of - the named register in the winding order. <i>Windreglocs</i> returns an - array of <i>Loc</i> structures corresponding to the winding registers, - in the winding order.<br> - -</table> -<p><font size=+1><b>EXAMPLE </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - The following code writes a simple stack trace to standard output, - stopping after at most 20 stack frames.<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - static int<br> - trace(Map *map, ulong pc, ulong callerpc,<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - Rgetter rget, Symbol *s, int depth)<br> - - </table> - {<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - char buf[512];<br> - int i, first;<br> - u32int v;<br> - Symbol s2;<br> - if(sym)<br> - print("%s+%lx", s->name, pc - loceval(s->loc));<br> - else<br> - print("%lux", pc);<br> - print("(");<br> - first = 0;<br> - for(i=0; indexlsym(s, &i, &s2)>=0; i++){<br> - if(s.class != CPARAM)<br> - continue;<br> - if(first++)<br> - print(", ");<br> - if(lget4(map, rget, s->loc, &v) >= 0)<br> - print("%s=%#lux", s->name, (ulong)v);<br> - else<br> - print("%s=???", s->name);<br> - }<br> - print(") called from ");<br> - symoff(buf, sizeof buf, callerpc, CTEXT);<br> - print("%s\n", buf);<br> - return depth < 20;<br> - - </table> - }<br> - - <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - if(stacktrace(map, nil, trace) <= 0)<br> - print("no stack frame0);<br> - - </table> - - </table> - -</table> -<p><font size=+1><b>SOURCE </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - <tt><font size=+1>/usr/local/plan9/src/libmach<br> - </font></tt> -</table> -<p><font size=+1><b>SEE ALSO </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - <a href="../man3/mach.html"><i>mach</i>(3)</a><br> - -</table> -<p><font size=+1><b>BUGS </b></font><br> - -<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> - - Need to talk about Regs<br> - -</table> - -<td width=20> -<tr height=20><td> -</table> -<!-- TRAILER --> -<table border=0 cellpadding=0 cellspacing=0 width=100%> -<tr height=15><td width=10><td><td width=10> -<tr><td><td> -<center> -<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> -</center> -</table> -<!-- TRAILER --> -</body></html> |