D45649.1784367812.diff
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D45649.1784367812.diff
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	diff --git a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
	--- a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
	+++ b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
	@@ -238,14 +238,31 @@
	printf("IMPLEMENT ME: %s\n", __func__);
	}

	-/ARGSUSED/
	uint64_t
	-dtrace_getarg(int arg, int aframes)
	+dtrace_getarg(int arg, int aframes __unused)
	{
	+ struct trapframe *tf;

	- printf("IMPLEMENT ME: %s\n", __func__);
	-
	- return (0);
	+ /*
	+ * We only handle invop providers here.
	+ */
	+ if ((tf = curthread->t_dtrace_trapframe) == NULL) {
	+ DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
	+ return (0);
	+ } else if (arg < 8) {
	+ return (tf->tf_x[arg]);
	+ } else {
	+ uint64_t *p, val;
	+
	+ p = (uint64_t )(tf->tf_sp + (arg - 8) sizeof(uint64_t));
	+ if (!kstack_contains(curthread, (vm_offset_t)p, sizeof(*p))) {
	+ DTRACE_CPUFLAG_SET(CPU_DTRACE_BADSTACK);
	+ cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)p;
	+ return (0);
	+ }
	+ memcpy(&val, p, sizeof(*p));
	+ return (val);
	+ }
	}

	int