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This commit is contained in:
Mark Kettenis
2003-11-09 17:32:32 +00:00
parent a3640c7517
commit 0670c0aaee
2 changed files with 8 additions and 176 deletions
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95
gdb/i386-linux-tdep.c
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@@ -25,19 +25,15 @@
#include "value.h"
#include "regcache.h"
#include "inferior.h"
#include "reggroups.h"
/* For i386_linux_skip_solib_resolver. */
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "solib-svr4.h" /* For struct link_map_offsets. */
#include "osabi.h"
#include "reggroups.h"
#include "solib-svr4.h"
#include "gdb_string.h"
#include "i386-tdep.h"
#include "i386-linux-tdep.h"
#include "glibc-tdep.h"
/* Return the name of register REG. */
@@ -312,89 +308,10 @@ i386_linux_write_pc (CORE_ADDR pc, ptid_t ptid)
/* Calling functions in shared libraries. */
/* Find the minimal symbol named NAME, and return both the minsym
struct and its objfile. This probably ought to be in minsym.c, but
everything there is trying to deal with things like C++ and
SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may
be considered too special-purpose for general consumption. */
static struct minimal_symbol *
find_minsym_and_objfile (char *name, struct objfile **objfilep)
{
struct objfile *objfile;
ALL_OBJFILES (objfile)
{
struct minimal_symbol *msym;
ALL_OBJFILE_MSYMBOLS (objfile, msym)
{
if (SYMBOL_LINKAGE_NAME (msym)
&& strcmp (SYMBOL_LINKAGE_NAME (msym), name) == 0)
{
*objfilep = objfile;
return msym;
}
}
}
return 0;
}
static CORE_ADDR
skip_gnu_resolver (CORE_ADDR pc)
{
/* The GNU dynamic linker is part of the GNU C library, so many
GNU/Linux distributions use it. (All ELF versions, as far as I
know.) An unresolved PLT entry points to "_dl_runtime_resolve",
which calls "fixup" to patch the PLT, and then passes control to
the function.
We look for the symbol `_dl_runtime_resolve', and find `fixup' in
the same objfile. If we are at the entry point of `fixup', then
we set a breakpoint at the return address (at the top of the
stack), and continue.
It's kind of gross to do all these checks every time we're
called, since they don't change once the executable has gotten
started. But this is only a temporary hack --- upcoming versions
of GNU/Linux will provide a portable, efficient interface for
debugging programs that use shared libraries. */
struct objfile *objfile;
struct minimal_symbol *resolver
= find_minsym_and_objfile ("_dl_runtime_resolve", &objfile);
if (resolver)
{
struct minimal_symbol *fixup
= lookup_minimal_symbol ("fixup", NULL, objfile);
if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
return frame_pc_unwind (get_current_frame ());
}
return 0;
}
/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
This function:
1) decides whether a PLT has sent us into the linker to resolve
a function reference, and
2) if so, tells us where to set a temporary breakpoint that will
trigger when the dynamic linker is done. */
CORE_ADDR
i386_linux_skip_solib_resolver (CORE_ADDR pc)
{
CORE_ADDR result;
/* Plug in functions for other kinds of resolvers here. */
result = skip_gnu_resolver (pc);
if (result)
return result;
return 0;
return glibc_skip_solib_resolver (pc);
}
/* Fetch (and possibly build) an appropriate link_map_offsets