Use the kernel stack in the ARM FBT DTrace provider. This is used to find
the fifth argument to functions being traced, however there was an error where the userspace stack was being used. This may be invalid leading to a kernel panic if this address is unmapped. Submitted by: Graeme Jenkinson <graeme.jenkinson@cl.cam.ac.uk> MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D9229
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=312378
@ -61,7 +61,7 @@ fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval)
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/* Get 5th parameter from stack */
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DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
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fifthparam = *(register_t *)frame->tf_usr_sp;
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fifthparam = *(register_t *)frame->tf_svc_sp;
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DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR);
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dtrace_probe(fbt->fbtp_id, frame->tf_r0,
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