Date: Mon, 23 Jun 2014 01:10:56 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r267759 - head/sys/cddl/dev/dtrace/amd64 Message-ID: <201406230110.s5N1Auem090289@svn.freebsd.org>
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Author: markj Date: Mon Jun 23 01:10:56 2014 New Revision: 267759 URL: http://svnweb.freebsd.org/changeset/base/267759 Log: Fix a couple of bugs on amd64 when fetching probe arguments beyond the first five for probes entered through a UD fault (i.e. FBT probes). Specifically, handle the fact that dtrace_invop_callsite must be 16 byte-aligned and thus may not immediately follow the call to dtrace_invop() in dtrace_invop_start(). Also fetch register arguments and the stack pointer through a struct trapframe instead of a struct reg. PR: 191260 Submitted by: luke.tw@gmail.com MFC after: 3 weeks Modified: head/sys/cddl/dev/dtrace/amd64/dtrace_isa.c Modified: head/sys/cddl/dev/dtrace/amd64/dtrace_isa.c ============================================================================== --- head/sys/cddl/dev/dtrace/amd64/dtrace_isa.c Mon Jun 23 00:54:56 2014 (r267758) +++ head/sys/cddl/dev/dtrace/amd64/dtrace_isa.c Mon Jun 23 01:10:56 2014 (r267759) @@ -349,7 +349,8 @@ dtrace_getarg(int arg, int aframes) for (i = 1; i <= aframes; i++) { fp = fp->f_frame; - if (fp->f_retaddr == (long)dtrace_invop_callsite) { + if (P2ROUNDUP(fp->f_retaddr, 16) == + (long)dtrace_invop_callsite) { /* * In the case of amd64, we will use the pointer to the * regs structure that was pushed when we took the @@ -363,33 +364,33 @@ dtrace_getarg(int arg, int aframes) * we're seeking is passed in regsiters, we can just * load it directly. */ - struct reg *rp = (struct reg *)((uintptr_t)&fp[1] + - sizeof (uintptr_t)); + struct trapframe *tf = + (struct trapframe *)((uintptr_t)&fp[1]); if (arg <= inreg) { switch (arg) { case 0: - stack = (uintptr_t *)&rp->r_rdi; + stack = (uintptr_t *)&tf->tf_rdi; break; case 1: - stack = (uintptr_t *)&rp->r_rsi; + stack = (uintptr_t *)&tf->tf_rsi; break; case 2: - stack = (uintptr_t *)&rp->r_rdx; + stack = (uintptr_t *)&tf->tf_rdx; break; case 3: - stack = (uintptr_t *)&rp->r_rcx; + stack = (uintptr_t *)&tf->tf_rcx; break; case 4: - stack = (uintptr_t *)&rp->r_r8; + stack = (uintptr_t *)&tf->tf_r8; break; case 5: - stack = (uintptr_t *)&rp->r_r9; + stack = (uintptr_t *)&tf->tf_r9; break; } arg = 0; } else { - stack = (uintptr_t *)(rp->r_rsp); + stack = (uintptr_t *)(tf->tf_rsp); arg -= inreg; } goto load;
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