D20896.diff
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	Index: head/sys/powerpc/powerpc/exec_machdep.c
	===================================================================
	--- head/sys/powerpc/powerpc/exec_machdep.c
	+++ head/sys/powerpc/powerpc/exec_machdep.c
	@@ -144,6 +144,7 @@
	#endif
	size_t sfpsize;
	caddr_t sfp, usfp;
	+ register_t sp;
	int oonstack, rndfsize;
	int sig;
	int code;
	@@ -155,7 +156,6 @@
	psp = p->p_sigacts;
	mtx_assert(&psp->ps_mtx, MA_OWNED);
	tf = td->td_frame;
	- oonstack = sigonstack(tf->fixreg[1]);

	/*
	* Fill siginfo structure.
	@@ -173,6 +173,8 @@
	sfp = (caddr_t)&sf32;
	sfpsize = sizeof(sf32);
	rndfsize = roundup(sizeof(sf32), 16);
	+ sp = (uint32_t)tf->fixreg[1];
	+ oonstack = sigonstack(sp);

	/*
	* Save user context
	@@ -203,6 +205,8 @@
	#else
	rndfsize = roundup(sizeof(sf), 16);
	#endif
	+ sp = tf->fixreg[1];
	+ oonstack = sigonstack(sp);

	/*
	* Save user context
	@@ -232,7 +236,7 @@
	usfp = (void *)(((uintptr_t)td->td_sigstk.ss_sp +
	td->td_sigstk.ss_size - rndfsize) & ~0xFul);
	} else {
	- usfp = (void *)((tf->fixreg[1] - rndfsize) & ~0xFul);
	+ usfp = (void *)((sp - rndfsize) & ~0xFul);
	}

	/*