Browse Source
* config/arm/linux.mt (TDEPFILES): Add glibc-tdep.o * config/i386/linux.mt (TDEPFILES): Likewise. * i386-linux-tdep.c (glibc-tdep.h): Include. (find_minsym_and_objfile, skip_hurd_resolver): Delete. (i386_linux_skip_solib_resolver): Call glibc_skip_solib_resolver. * arm-linux-tdep.c (glibc-tdep.h): Include. (find_minsym_and_objfile, skip_hurd_resolver): Delete. (arm_linux_skip_solib_resolver): Call glibc_skip_solib_resolver. * Makefile.in (ALLDEPFILES): Add glibc-tdep.c (glibc_tdep_h): Define. (glibc-tdep.o): Add dependencies. (arm-linux-tdep.o): Update dependencies. (i386-linux-tdep.o): Likewise.cagney_bigcore-20040122-branch
Mark Kettenis
23 years ago
6 changed files with 154 additions and 4 deletions
@ -1,3 +1,3 @@ |
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# Target: ARM based machine running GNU/Linux |
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TM_FILE= tm-linux.h |
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TDEPFILES= arm-tdep.o arm-linux-tdep.o solib.o solib-svr4.o solib-legacy.o |
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TDEPFILES= arm-tdep.o arm-linux-tdep.o glibc-tdep.o solib.o solib-svr4.o solib-legacy.o |
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@ -1,4 +1,4 @@ |
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# Target: Intel 386 running GNU/Linux |
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TDEPFILES= i386-tdep.o i386-linux-tdep.o i387-tdep.o \ |
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TDEPFILES= i386-tdep.o i386-linux-tdep.o glibc-tdep.o i387-tdep.o \ |
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solib.o solib-svr4.o solib-legacy.o |
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TM_FILE= tm-linux.h |
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@ -0,0 +1,101 @@ |
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/* Target-dependent code for the GNU C Library (glibc).
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Copyright 2002, 2003 Free Software Foundation, Inc. |
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This file is part of GDB. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place - Suite 330, |
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Boston, MA 02111-1307, USA. */ |
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#include "defs.h" |
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#include "frame.h" |
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#include "symtab.h" |
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#include "symfile.h" |
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#include "objfiles.h" |
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#include "glibc-tdep.h" |
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/* Calling functions in shared libraries. */ |
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/* Find the minimal symbol named NAME, and return both the minsym
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struct and its objfile. This probably ought to be in minsym.c, but |
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everything there is trying to deal with things like C++ and |
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SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may |
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be considered too special-purpose for general consumption. */ |
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static struct minimal_symbol * |
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find_minsym_and_objfile (char *name, struct objfile **objfile_p) |
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{ |
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struct objfile *objfile; |
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ALL_OBJFILES (objfile) |
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{ |
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struct minimal_symbol *msym; |
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ALL_OBJFILE_MSYMBOLS (objfile, msym) |
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{ |
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if (SYMBOL_LINKAGE_NAME (msym) |
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&& strcmp (SYMBOL_LINKAGE_NAME (msym), name) == 0) |
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{ |
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*objfile_p = objfile; |
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return msym; |
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} |
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} |
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} |
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return 0; |
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} |
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/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
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This function: |
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1) decides whether a PLT has sent us into the linker to resolve |
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a function reference, and |
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2) if so, tells us where to set a temporary breakpoint that will |
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trigger when the dynamic linker is done. */ |
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CORE_ADDR |
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glibc_skip_solib_resolver (CORE_ADDR pc) |
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{ |
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/* The GNU dynamic linker is part of the GNU C library, and is used
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by all GNU systems (GNU/Hurd, GNU/Linux). An unresolved PLT |
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entry points to "_dl_runtime_resolve", which calls "fixup" to |
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patch the PLT, and then passes control to the function. |
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We look for the symbol `_dl_runtime_resolve', and find `fixup' in |
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the same objfile. If we are at the entry point of `fixup', then |
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we set a breakpoint at the return address (at the top of the |
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stack), and continue. |
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It's kind of gross to do all these checks every time we're |
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called, since they don't change once the executable has gotten |
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started. But this is only a temporary hack --- upcoming versions |
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of GNU/Linux will provide a portable, efficient interface for |
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debugging programs that use shared libraries. */ |
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struct objfile *objfile; |
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struct minimal_symbol *resolver |
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= find_minsym_and_objfile ("_dl_runtime_resolve", &objfile); |
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if (resolver) |
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{ |
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struct minimal_symbol *fixup |
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= lookup_minimal_symbol ("fixup", NULL, objfile); |
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if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc) |
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return frame_pc_unwind (get_current_frame ()); |
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} |
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return 0; |
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} |
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@ -0,0 +1,27 @@ |
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/* Target-dependent code for the GNU C Library (glibc).
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Copyright 2002, 2003 Free Software Foundation, Inc. |
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This file is part of GDB. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place - Suite 330, |
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Boston, MA 02111-1307, USA. */ |
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#ifndef GLIBC_TDEP_H |
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#define GLIBC_TDEP_H |
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extern CORE_ADDR glibc_skip_solib_resolver (CORE_ADDR); |
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#endif /* glibc-tdep.h */ |
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