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* hppa-tdep.c (hppa_fix_call_dummy): Prefer import stubs over

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export stubs and actual shared library functions so that lazy
	binding works correctly.  Try both __d_plt_call and __gcc_plt_call
	trampolines for calling import stubs.
This commit is contained in:
Jeff Law 1994-12-29 02:31:10 +00:00
parent b6c1564694
commit 3200aa595b
2 changed files with 63 additions and 17 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
Wed Dec 28 19:27:22 1994 Jeff Law (law@snake.cs.utah.edu)
* hppa-tdep.c (hppa_fix_call_dummy): Prefer import stubs over
export stubs and actual shared library functions so that lazy
binding works correctly. Try both __d_plt_call and __gcc_plt_call
trampolines for calling import stubs.
Wed Dec 28 15:29:02 1994 Stan Shebs <shebs@andros.cygnus.com>
* a29k-tdep.c (pop_frame): Fix a variable name.

73
gdb/hppa-tdep.c
View File

@ -1419,16 +1419,48 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
else
{
/* FUN could be either an export stub, or the real address of a
function in a shared library.
To call this function we need to get the GOT/DP value for the target
function. Do this by calling shared library support routines in
somsolib.c. Once the GOT value is in %r19 we can call the procedure
in the normal fashion. */
#ifndef GDB_TARGET_IS_PA_ELF
write_register (19, som_solib_get_got_by_pc (fun));
/* FUN could be either an export stub, or the real address of a
function in a shared library. We must call an import stub
rather than the export stub or real function for lazy binding
to work correctly. */
if (som_solib_get_got_by_pc (fun))
{
struct objfile *objfile;
struct minimal_symbol *funsymbol, *stub_symbol;
CORE_ADDR newfun = 0;
funsymbol = lookup_minimal_symbol_by_pc (fun);
if (!funsymbol)
error ("Unable to find minimal symbol for target fucntion.\n");
/* Search all the object files for an import symbol with the
right name. */
ALL_OBJFILES (objfile)
{
stub_symbol = lookup_minimal_symbol (SYMBOL_NAME (funsymbol),
objfile);
/* Found a symbol with the right name. */
if (stub_symbol)
{
struct unwind_table_entry *u;
/* It must be a shared library trampoline. */
if (SYMBOL_TYPE (stub_symbol) != mst_solib_trampoline)
continue;
/* It must also be an import stub. */
u = find_unwind_entry (SYMBOL_VALUE (stub_symbol));
if (!u || u->stub_type != IMPORT)
continue;
/* OK. Looks like the correct import stub. */
newfun = SYMBOL_VALUE (stub_symbol);
fun = newfun;
}
}
if (newfun == 0)
write_register (19, som_solib_get_got_by_pc (fun));
}
#endif
}
@ -1444,20 +1476,27 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
CORE_ADDR new_fun;
msymbol = lookup_minimal_symbol ("__d_plt_call", (struct objfile *) NULL);
if (msymbol == NULL)
error ("Can't find an address for __d_plt_call trampoline");
msymbol = lookup_minimal_symbol ("__gcc_plt_call", NULL);
if (msymbol == NULL)
error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline");
/* This is where sr4export will jump to. */
new_fun = SYMBOL_VALUE_ADDRESS (msymbol);
/* We have to store the address of the stub in __shlib_funcptr. */
msymbol = lookup_minimal_symbol ("__shlib_funcptr",
(struct objfile *)NULL);
if (msymbol == NULL)
error ("Can't find an address for __shlib_funcptr");
if (strcmp (SYMBOL_NAME (msymbol), "__d_plt_call"))
write_register (22, fun);
else
{
/* We have to store the address of the stub in __shlib_funcptr. */
msymbol = lookup_minimal_symbol ("__shlib_funcptr",
(struct objfile *)NULL);
if (msymbol == NULL)
error ("Can't find an address for __shlib_funcptr");
target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&fun, 4);
target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&fun, 4);
}
fun = new_fun;
}
/* We still need sr4export's address too. */