From 2d0ddea123e8d5d1113b80692689a80f37d46e6f Mon Sep 17 00:00:00 2001 From: Mark Wielaard Date: Mon, 21 Dec 2009 13:02:19 +0100 Subject: PR11015 Support shared library reloading (in different processes) * runtime/task_finder_vma.c (stap_remove_vma_map_info): Return negative status on failure. (stap_find_vma_map_info): Likewise. (stap_find_vma_map_info_user): New function. (stap_drop_vma_maps): New function. * runtime/sym.h (addr): Renamed to static_addr, to store addresses for sections which are always mapped at the same address. (_stp_module_relocate): Add extra struct task_struct *tsk argument. * runtime/sym.c (_stp_tf_exec_cb): New callback, calls stap_drop_vma_maps. (_stp_tf_mmap_cb): Don't store address in module.section, but call stap_add_vma_map_info() per tsk->group_leader for matched module. Don't register empty/null modules. (_stp_module_relocate): Take extra struct task_struct *tsk argument, cache last tsk used. Only use section->static_addr for none dynamic modules. Use stap_find_vma_map_info_user() to locate dynamic modules. (_stp_mod_sec_lookup): Add extra argument unsigned long *rel_addr to optionally store relative address when module/section found. (_stp_kallsyms_lookup): Use _stp_mod_sec_lookup to find relative address. (_stp_sym_init): Register _stp_tf_exec_cb in stap_task_finder_target. Add error check to see if task finder could be initialized. * dwflpp.cxx (emit_address): Pass NULL for kernel/modules and current for user tasks to _stp_module_relocate. * runtime/transport/symbols.c (_stp_do_relocation): Set new static_addr _stp_section field. * runtime/unwind.c (adjustStartLoc): Take new struct task_struct *tsk argument and pass to stap_find_vma_map_info_user and _stp_module_relocate to find adjusted addr. (_stp_search_unwind_hdr): Pass through struct task_struct *tsk. (unwind_frame): Likewise. * tapset/context-symbols.stp (probemod): Add NULL to _stp_mod_sec_lookup call to indicate we aren't interested in relative address. * tapsets.cxx (dwarf_derived_probe_group::emit_module_init): Pass NULL to _stp_module_relocate to indicate kernel/module address. --- dwflpp.cxx | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'dwflpp.cxx') diff --git a/dwflpp.cxx b/dwflpp.cxx index d3cecc44..4fb0d54e 100644 --- a/dwflpp.cxx +++ b/dwflpp.cxx @@ -1523,7 +1523,7 @@ dwflpp::emit_address (struct obstack *pool, Dwarf_Addr address) // This gives us the module name, and section name within the // module, for a kernel module (or other ET_REL module object). obstack_printf (pool, "({ unsigned long addr = 0; "); - obstack_printf (pool, "addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 "); ", + obstack_printf (pool, "addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 ", NULL); ", modname, secname, reloc_address); obstack_printf (pool, "addr; })"); } @@ -1537,7 +1537,7 @@ dwflpp::emit_address (struct obstack *pool, Dwarf_Addr address) // kernel will never move after being loaded (unlike modules and // user-space dynamic share libraries). obstack_printf (pool, "({ static unsigned long addr = 0; "); - obstack_printf (pool, "if (addr==0) addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 "); ", + obstack_printf (pool, "if (addr==0) addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 ", NULL); ", modname, secname, address); // PR10000 NB: not reloc_address obstack_printf (pool, "addr; })"); } @@ -1545,7 +1545,7 @@ dwflpp::emit_address (struct obstack *pool, Dwarf_Addr address) { enable_task_finder (sess); obstack_printf (pool, "({ unsigned long addr = 0; "); - obstack_printf (pool, "addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 "); ", + obstack_printf (pool, "addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 ", current); ", modname, ".dynamic", reloc_address); obstack_printf (pool, "addr; })"); } -- cgit