Messages in this thread Patch in this message |  | | | Date | Thu, 16 Mar 2006 08:59:56 +0100 | | From | Philippe De Muyter <> | | Subject | [PATCH] m68knommu : clear frame-pointer in start_thread |
When trying to print the calltrace of a user process on m68knommu targets gdb follows the frame-pointer and 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 <phdm@macqel.be>
--- the only real change is the initialisation of a6, the rest is spacing fixes ((struct switch_stack *)(_regs))[-1].a6 = 0;
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 -u -r1.1.1.1 processor.h --- linux-2.6.x/include/asm-m68knommu/processor.h 2004/05/07 08:40:13 1.1.1.1 +++ linux-2.6.x/include/asm-m68knommu/processor.h 2006/03/16 07:26:52 @@ -89,14 +89,15 @@ * pass the data segment into user programs if it exists, * it can't hurt anything as far as I can tell */ -#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); \ } while(0) /* Forward declaration, a strange C thing */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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