-__private_extern__
-kern_return_t chudxnu_thread_get_callstack( thread_t thread,
- uint32_t *callStack,
- mach_msg_type_number_t *count,
- boolean_t user_only)
-{
- kern_return_t kr;
- task_t task = get_threadtask(thread);
- uint64_t nextFramePointer = 0;
- uint64_t currPC, currLR, currR0;
- uint64_t framePointer;
- uint64_t prevPC = 0;
- uint64_t kernStackMin = min_valid_stack_address();
- uint64_t kernStackMax = max_valid_stack_address();
- uint32_t *buffer = callStack;
- uint32_t tmpWord;
- int bufferIndex = 0;
- int bufferMaxIndex = *count;
- boolean_t supervisor;
- boolean_t is64Bit;
- struct savearea *sv;
-
- if(user_only) {
- sv = find_user_regs(thread);
- } else {
- sv = find_kern_regs(thread);
- }
-
- if(!sv) {
- *count = 0;
- return KERN_FAILURE;
- }
-
- supervisor = SUPERVISOR_MODE(sv->save_srr1);
- if(supervisor) {
-#warning assuming kernel task is always 32-bit
- is64Bit = FALSE;
- } else {
- is64Bit = chudxnu_is_64bit_task(task);
- }
-
- bufferMaxIndex = bufferMaxIndex - 2; // allot space for saving the LR and R0 on the stack at the end.
- if(bufferMaxIndex<2) {
- *count = 0;
- return KERN_RESOURCE_SHORTAGE;
- }
-
- currPC = sv->save_srr0;
- framePointer = sv->save_r1; /* r1 is the stack pointer (no FP on PPC) */
- currLR = sv->save_lr;
- currR0 = sv->save_r0;
-
- bufferIndex = 0; // start with a stack of size zero
- buffer[bufferIndex++] = currPC; // save PC in position 0.
-
- // Now, fill buffer with stack backtraces.
- while(bufferIndex<bufferMaxIndex && VALID_STACK_ADDRESS(framePointer)) {
- uint64_t pc = 0;
- // Above the stack pointer, the following values are saved:
- // saved LR
- // saved CR
- // saved SP
- //-> SP
- // Here, we'll get the lr from the stack.
- uint64_t fp_link;
-
- if(is64Bit) {
- fp_link = framePointer + FP_LINK_OFFSET*sizeof(uint64_t);
- } else {
- fp_link = framePointer + FP_LINK_OFFSET*sizeof(uint32_t);
- }
-
- // Note that we read the pc even for the first stack frame (which, in theory,
- // is always empty because the callee fills it in just before it lowers the
- // stack. However, if we catch the program in between filling in the return
- // address and lowering the stack, we want to still have a valid backtrace.
- // FixupStack correctly disregards this value if necessary.
-
- if(supervisor) {
- if(is64Bit) {
- kr = chudxnu_kern_read(&pc, fp_link, sizeof(uint64_t));
- } else {
- kr = chudxnu_kern_read(&tmpWord, fp_link, sizeof(uint32_t));
- pc = tmpWord;
- }
- } else {
- if(is64Bit) {
- kr = chudxnu_task_read(task, &pc, fp_link, sizeof(uint64_t));
- } else {
- kr = chudxnu_task_read(task, &tmpWord, fp_link, sizeof(uint32_t));
- pc = tmpWord;
- }
- }
- if(kr!=KERN_SUCCESS) {
- pc = 0;
- break;
- }
-
- // retrieve the contents of the frame pointer and advance to the next stack frame if it's valid
- if(supervisor) {
- if(is64Bit) {
- kr = chudxnu_kern_read(&nextFramePointer, framePointer, sizeof(uint64_t));
- } else {
- kr = chudxnu_kern_read(&tmpWord, framePointer, sizeof(uint32_t));
- nextFramePointer = tmpWord;
- }
- } else {
- if(is64Bit) {
- kr = chudxnu_task_read(task, &nextFramePointer, framePointer, sizeof(uint64_t));
- } else {
- kr = chudxnu_task_read(task, &tmpWord, framePointer, sizeof(uint32_t));
- nextFramePointer = tmpWord;
- }
- }
- if(kr!=KERN_SUCCESS) {
- nextFramePointer = 0;
- }
-
- if(nextFramePointer) {
- buffer[bufferIndex++] = pc;
- prevPC = pc;
- }
-
- if(nextFramePointer<framePointer) {
- break;
- } else {
- framePointer = nextFramePointer;
- }
- }
-
- if(bufferIndex>=bufferMaxIndex) {
- *count = 0;
- return KERN_RESOURCE_SHORTAGE;
- }
-
- // Save link register and R0 at bottom of stack (used for later fixup).
- buffer[bufferIndex++] = currLR;
- buffer[bufferIndex++] = currR0;
-
- *count = bufferIndex;
- return KERN_SUCCESS;
-}
-
-#pragma mark **** DEPRECATED ****
-
-// DEPRECATED
-__private_extern__
-kern_return_t chudxnu_bind_current_thread(int cpu)
-{
- return chudxnu_bind_thread(current_thread(), cpu);
-}
-
-// DEPRECATED
-kern_return_t chudxnu_unbind_current_thread(void)
-{
- return chudxnu_unbind_thread(current_thread());
-}
-
-// DEPRECATED
-__private_extern__
-kern_return_t chudxnu_current_thread_get_callstack( uint32_t *callStack,
- mach_msg_type_number_t *count,
- boolean_t user_only)
-{
- return chudxnu_thread_get_callstack(current_thread(), callStack, count, user_only);
-}
-
-// DEPRECATED
-__private_extern__
-thread_t chudxnu_current_act(void)
-{
- return chudxnu_current_thread();
-}
projects / apple / xnu.git / blobdiff