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/**************************************************************************
*
* Copyright (c) 2013 Alcatel-Lucent
*
* Alcatel Lucent licenses this file to You under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. A copy of the License is contained the
* file LICENSE at the top level of this repository.
* You may also obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**************************************************************************
*
* strace.c:
*
* Note that this stack trace can be used to trace REAL exceptions or
* user-induced exceptions. If one is user-induced, then the user is
* typically just replacing an instruction at the point at which the break
* is to occur with a SC (syscall) instruction. The point at which this
* insertion is made must be after the function sets up its stack frame
* otherwise it is likely that the trace will be bogus.
*
* BTW... the SC instruction is 0x44000002.
*
* Original author: Ed Sutter (ed.sutter@alcatel-lucent.com)
*
*/
#include "config.h"
#if INCLUDE_STRACE
#include "tfs.h"
#include "tfsprivate.h"
#include <ctype.h>
#include "genlib.h"
#include "stddefs.h"
char *StraceHelp[] = {
"Stack trace",
"-[d:rs:v]",
" -d # max depth count (def=20)",
" -r dump regs",
" -s {func} stop at function 'func'",
" -v verbose",
0,
};
int
Strace(int argc,char *argv[])
{
TFILE *tfp;
char *symfile, *stopat, fname[64];
ulong *framepointer, pc, fp, offset;
int tfd, opt, maxdepth, pass, verbose;
tfd = fp = 0;
maxdepth = 20;
verbose = 0;
stopat = 0;
pc = ExceptionAddr;
while ((opt=getopt(argc,argv,"d:rs:v")) != -1) {
switch(opt) {
case 'd':
maxdepth = atoi(optarg);
break;
case 'r':
showregs();
break;
case 's':
stopat = optarg;
break;
case 'v':
verbose = 1;
break;
default:
return(0);
}
}
if (!fp)
getreg("R11", &fp);
framepointer = (ulong *)fp;
/* Start by detecting the presence of a symbol table file... */
symfile = getenv("SYMFILE");
if (!symfile)
symfile = SYMFILE;
tfp = tfsstat(symfile);
if (tfp) {
tfd = tfsopen(symfile,TFS_RDONLY,0);
if (tfd < 0)
tfp = (TFILE *)0;
}
/* Show current position: */
printf(" 0x%08lx",pc);
if (tfp) {
AddrToSym(tfd,pc,fname,&offset);
printf(": %s()",fname);
if (offset)
printf(" + 0x%lx",offset);
}
putchar('\n');
/* Now step through the stack frame... */
pass = 0;
while(maxdepth) {
if (pass != 0)
framepointer = (ulong *)*(framepointer - 3);
pc = *(framepointer - 1);
if (verbose) {
printf("fp=0x%lx,*fp=0x%lx,pc=%lx\n", (ulong)framepointer,
(ulong)*framepointer,pc);
}
if (((ulong)framepointer & 3) || (!framepointer) ||
(!*framepointer) || (!pc)) {
break;
}
printf(" 0x%08lx",pc);
if (tfp) {
int match;
match = AddrToSym(tfd,pc,fname,&offset);
printf(": %s()",fname);
if (offset)
printf(" + 0x%lx",offset);
if ((!match) || ((stopat != 0) && (strcmp(fname,stopat) == 0))) {
putchar('\n');
break;
}
}
putchar('\n');
maxdepth--;
pass++;
}
if (!maxdepth)
printf("Max depth termination\n");
if (tfp) {
tfsclose(tfd,0);
}
return(0);
}
#endif
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