perf probe: Use original address instead of CU-based address
Use original address for looking up the location of variables for dwarf_getlocation_addr() instead of CU-based address. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20100315170235.31852.91195.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -352,8 +352,7 @@ static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
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if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
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if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
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goto error;
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goto error;
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/* TODO: handle more than 1 exprs */
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/* TODO: handle more than 1 exprs */
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ret = dwarf_getlocation_addr(&attr, (pf->addr - pf->cu_base),
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ret = dwarf_getlocation_addr(&attr, pf->addr, &expr, &nexpr, 1);
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&expr, &nexpr, 1);
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if (ret <= 0 || nexpr == 0)
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if (ret <= 0 || nexpr == 0)
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goto error;
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goto error;
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@ -437,8 +436,7 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
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/* Get the frame base attribute/ops */
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/* Get the frame base attribute/ops */
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dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr);
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dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr);
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ret = dwarf_getlocation_addr(&fb_attr, (pf->addr - pf->cu_base),
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ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
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&pf->fb_ops, &nops, 1);
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if (ret <= 0 || nops == 0)
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if (ret <= 0 || nops == 0)
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pf->fb_ops = NULL;
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pf->fb_ops = NULL;
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@ -644,7 +642,6 @@ static void find_probe_point_by_func(struct probe_finder *pf)
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int find_probe_point(int fd, struct probe_point *pp)
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int find_probe_point(int fd, struct probe_point *pp)
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{
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{
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struct probe_finder pf = {.pp = pp};
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struct probe_finder pf = {.pp = pp};
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int ret;
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Dwarf_Off off, noff;
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Dwarf_Off off, noff;
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size_t cuhl;
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size_t cuhl;
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Dwarf_Die *diep;
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Dwarf_Die *diep;
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@ -671,10 +668,6 @@ int find_probe_point(int fd, struct probe_point *pp)
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pf.fname = NULL;
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pf.fname = NULL;
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if (!pp->file || pf.fname) {
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if (!pp->file || pf.fname) {
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/* Save CU base address (for frame_base) */
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ret = dwarf_lowpc(&pf.cu_die, &pf.cu_base);
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if (ret != 0)
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pf.cu_base = 0;
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if (pp->function)
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if (pp->function)
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find_probe_point_by_func(&pf);
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find_probe_point_by_func(&pf);
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else if (pp->lazy_line)
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else if (pp->lazy_line)
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@ -71,7 +71,6 @@ struct probe_finder {
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/* For variable searching */
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/* For variable searching */
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Dwarf_Op *fb_ops; /* Frame base attribute */
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Dwarf_Op *fb_ops; /* Frame base attribute */
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Dwarf_Addr cu_base; /* Current CU base address */
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const char *var; /* Current variable name */
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const char *var; /* Current variable name */
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char *buf; /* Current output buffer */
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char *buf; /* Current output buffer */
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int len; /* Length of output buffer */
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int len; /* Length of output buffer */
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