When trying to print the calltrace of a user process on m68knommu targets
gdb follows the frame-pointer en falls on unreachable adresses, because
the frame pointer is not properly initialised by start_thread. This patch
initialises the frame pointer to NULL in start_thread.
Signed-off-by: Philippe De Muyter <[email protected]>
---
the only change is the initialisztion of a6, the rest is spacing fixes
Index: linux-2.6.x/include/asm-m68knommu/processor.h
===================================================================
RCS file: /newdev6/cvsrepos/uClinux-dist/linux-2.6.x/include/asm-m68knommu/processor.h,v
retrieving revision 1.1.1.1
diff -r1.1.1.1 processor.h
92,99c92,100
< #define start_thread(_regs, _pc, _usp) \
< do { \
< set_fs(USER_DS); /* reads from user space */ \
< (_regs)->pc = (_pc); \
< if (current->mm) \
< (_regs)->d5 = current->mm->start_data; \
< (_regs)->sr &= ~0x2000; \
< wrusp(_usp); \
---
> #define start_thread(_regs, _pc, _usp) \
> do { \
> set_fs(USER_DS); /* reads from user space */ \
> (_regs)->pc = (_pc); \
> ((struct switch_stack *)(_regs))[-1].a6 = 0; \
> if (current->mm) \
> (_regs)->d5 = current->mm->start_data; \
> (_regs)->sr &= ~0x2000; \
> wrusp(_usp); \
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