From mboxrd@z Thu Jan 1 00:00:00 1970 From: Randolph Chung To: gdb-patches@sources.redhat.com Subject: [patch/rfa] Handle unwinding through export stubs on hpux Date: Sat, 15 May 2004 23:58:00 -0000 Message-id: <20040515235801.GY566@tausq.org> X-SW-Source: 2004-05/msg00452.html This fixes a problem reported by Dave Anglin; when doing a backtrace through a function that is called through an export stub, the unwinder fails. The problem is that the stub unwinder assumes that the return pointer doesn't change inside the stub, but the export stub changes it. Possibly something also needs to be changed for an argument relocation stub. Will investigate and fix that separately if needed. tested on hppa2.0w-hp-hpux11.11. ok to apply? randolph 2004-05-15 Randolph Chung * hppa-tdep.c (hppa_stub_frame_unwind_cache): For HPUX stub unwinding, check to see if we are unwinding an export stub. Export stubs clobber the %rp in the call path and stores the original rp in a stack slot. Index: hppa-tdep.c =================================================================== RCS file: /cvs/src/src/gdb/hppa-tdep.c,v retrieving revision 1.156 diff -u -p -u -r1.156 hppa-tdep.c --- hppa-tdep.c 8 May 2004 03:59:34 -0000 1.156 +++ hppa-tdep.c 15 May 2004 20:54:57 -0000 @@ -2023,6 +2023,7 @@ hppa_stub_frame_unwind_cache (struct fra { struct gdbarch *gdbarch = get_frame_arch (next_frame); struct hppa_stub_unwind_cache *info; + struct unwind_table_entry *u; if (*this_cache) return *this_cache; @@ -2031,8 +2032,19 @@ hppa_stub_frame_unwind_cache (struct fra *this_cache = info; info->saved_regs = trad_frame_alloc_saved_regs (next_frame); - info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].realreg = HPPA_RP_REGNUM; - info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); + if ((gdbarch_osabi (gdbarch) == GDB_OSABI_HPUX_ELF + || gdbarch_osabi (gdbarch) == GDB_OSABI_HPUX_SOM) + && (u = find_unwind_entry (frame_pc_unwind (next_frame))) + && (u->stub_unwind.stub_type == EXPORT)) + { + info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); + info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].addr = info->base - 24; + } + else + { + info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); + info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].realreg = HPPA_RP_REGNUM; + } return info; } -- Randolph Chung Debian GNU/Linux Developer, hppa/ia64 ports http://www.tausq.org/