156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
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/***************************************************************************
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* STACK1.C
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*
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* Code to support stack tracing on task stacks.
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*
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***************************************************************************/
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#include "toolpriv.h"
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#include <newexe.h>
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#include <string.h>
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/* ----- Function prototypes ----- */
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NOEXPORT void StackTraceInfo(
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STACKTRACEENTRY FAR *lpStack);
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/* ----- Functions ----- */
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/* StackTraceFirst
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* Starts a task stack trace by returning information about the
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* first frame on the task's stack.
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*/
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BOOL TOOLHELPAPI StackTraceFirst(
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STACKTRACEENTRY FAR *lpStackTrace,
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HANDLE hTDB)
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{
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/* Check the version number and verify proper installation */
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if (!wLibInstalled || !lpStackTrace ||
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lpStackTrace->dwSize != sizeof (STACKTRACEENTRY))
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return FALSE;
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/* Get the first value */
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if (!(StackFrameFirst(lpStackTrace, hTDB)))
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return FALSE;
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/* Get module and segment number information */
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StackTraceInfo(lpStackTrace);
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return TRUE;
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}
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/* StackTraceCSIPFirst
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* Traces the stack of an arbitrary CS:IP. All parameters must be
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* given, and once started, the StackTraceNext function can be used
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* to trace the remainder of the stack
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*/
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BOOL TOOLHELPAPI StackTraceCSIPFirst(
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STACKTRACEENTRY FAR *lpStack,
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WORD wSS,
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WORD wCS,
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WORD wIP,
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WORD wBP)
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{
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/* Check the version number and verify proper installation */
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if (!wLibInstalled || !lpStack ||
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lpStack->dwSize != sizeof (STACKTRACEENTRY))
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return FALSE;
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/* Get the user information */
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lpStack->wSS = wSS;
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lpStack->wCS = wCS;
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lpStack->wIP = wIP;
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lpStack->wBP = wBP;
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/* Get module and segment number information */
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StackTraceInfo(lpStack);
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/* Set the hTask to the current task as we are in the current task
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* context. The CS may not be owned by this task, but at least
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* we put a reasonable value in there.
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*/
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lpStack->hTask = GetCurrentTask();
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return TRUE;
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}
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/* StackTraceNext
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* Continues a stack trace by returning information about the next
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* frame on the task's stack.
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* structure.
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*/
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BOOL TOOLHELPAPI StackTraceNext(
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STACKTRACEENTRY FAR *lpStackTrace)
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{
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/* Check the version number and verify proper installation */
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if (!wLibInstalled || !lpStackTrace ||
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lpStackTrace->dwSize != sizeof (STACKTRACEENTRY))
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return FALSE;
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/* Get information about this frame */
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if (!StackFrameNext(lpStackTrace))
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return FALSE;
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/* Get module and segment number information */
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StackTraceInfo(lpStackTrace);
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return TRUE;
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}
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/* ----- Helper functions ----- */
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/* StackTraceInfo
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* Gets module and segment number info about the given entry
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*/
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NOEXPORT void StackTraceInfo(
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STACKTRACEENTRY FAR *lpStack)
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{
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GLOBALENTRY GlobalEntry;
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struct new_exe FAR *lpNewExe;
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struct new_seg1 FAR *lpSeg;
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WORD i;
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/* If we have a NULL CS, this is a NEAR frame. Just return because we
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* assume the user hasn't trashed the structure. The module and seg
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* info will be the same as the last time
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*/
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if (!lpStack->wCS)
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return;
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/* Get information about the code segment block */
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GlobalEntry.dwSize = sizeof (GLOBALENTRY);
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if (!GlobalEntryHandle(&GlobalEntry, lpStack->wCS))
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return;
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/* The owner of all code segments is the hModule */
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lpStack->hModule = GlobalEntry.hOwner;
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/* To find the segment number, we look in the EXE header and count the
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* listed segments till we find this one
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*/
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/* Get a pointer to the EXE Header module */
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lpNewExe = MAKEFARPTR(HelperHandleToSel(lpStack->hModule), 0);
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/* Make sure this is a EXE Header segment */
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if (lpNewExe->ne_magic != NEMAGIC)
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return;
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/* Get the list of segments and go for it */
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lpSeg = MAKEFARPTR(HIWORD((DWORD)lpNewExe), lpNewExe->ne_segtab);
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for (i = 0 ; i < lpNewExe->ne_cseg ; ++i, ++lpSeg)
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if (HelperHandleToSel(lpSeg->ns_handle) == lpStack->wCS)
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break;
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if (i == lpNewExe->ne_cseg)
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return;
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/* Save the segment number (seg numbers start at one) */
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lpStack->wSegment = i + 1;
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}
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