/* Native support for the SGI Iris running IRIX version 5, for GDB.
- Copyright 1988, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+ Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994
+ Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
Implemented for Irix 4.x by Garrett A. Wollman.
#include "inferior.h"
#include "language.h"
-/* We need to set a breakpoint at a point when we know that the
- mapping of shared libraries is complete. dbx simply breaks at main
- (or, for FORTRAN, MAIN__), so we do the same. We can not break at
- the very beginning of main, because the startup code will jump into
- main after the GP initialization instructions. SOLIB_BKPT_OFFSET
- is used to skip those instructions. */
-
-#define SOLIB_BKPT_OFFSET 12
-
-static char *bkpt_names[] = {
- "main",
- "MAIN__",
- NULL
-};
-
/* The symbol which starts off the list of shared libraries. */
#define DEBUG_BASE "__rld_obj_head"
/* How to get the loaded address of a shared library. */
-#define LM_ADDR(so) ((so)->lm.o_base_address)
+#define LM_ADDR(so) ((so)->lm.o_praw)
char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
-extern CORE_ADDR sigtramp_address, sigtramp_end;
-
struct so_list {
struct so_list *next; /* next structure in linked list */
struct obj_list ll;
struct section_table *p;
struct cleanup *old_chain;
bfd *abfd;
+ CORE_ADDR offset;
filename = tilde_expand (so -> lm.o_path);
old_chain = make_cleanup (free, filename);
bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
}
+ /* Irix 5 shared objects are pre-linked to particular addresses
+ although the dynamic linker may have to relocate them if the
+ address ranges of the libraries used by the main program clash.
+ The offset is the difference between the address where the object
+ is mapped and the binding address of the shared library. */
+ offset = (CORE_ADDR) LM_ADDR (so) - so -> lm.o_base_address;
+
for (p = so -> sections; p < so -> sections_end; p++)
{
/* Relocate the section binding addresses as recorded in the shared
- object's file by the base address to which the object was actually
- mapped. */
- p -> addr += (CORE_ADDR) LM_ADDR (so);
- p -> endaddr += (CORE_ADDR) LM_ADDR (so);
+ object's file by the offset to get the address to which the
+ object was actually mapped. */
+ p -> addr += offset;
+ p -> endaddr += offset;
so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
if (STREQ (p -> the_bfd_section -> name, ".text"))
{
error ("Invalid regexp: %s", re_err);
}
- /* Getting new symbols may change our opinion about what is
- frameless. */
- reinit_frame_cache ();
- /* Not to mention where _sigtramp is. */
- sigtramp_address = 0;
-
- while ((so = find_solib (so)) != NULL)
- {
- if (so -> lm.o_path[0] && re_exec (so -> lm.o_path))
- {
- so -> from_tty = from_tty;
- if (so -> symbols_loaded)
- {
- if (from_tty)
- {
- printf_unfiltered ("Symbols already loaded for %s\n", so -> lm.o_path);
- }
- }
- else if (catch_errors
- (symbol_add_stub, (char *) so,
- "Error while reading shared library symbols:\n",
- RETURN_MASK_ALL))
- {
- so_last = so;
- so -> symbols_loaded = 1;
- }
- }
- }
-
- /* Now add the shared library sections to the section table of the
+ /* Add the shared library sections to the section table of the
specified target, if any. */
if (target)
{
}
}
}
+
+ /* Now add the symbol files. */
+ while ((so = find_solib (so)) != NULL)
+ {
+ if (so -> lm.o_path[0] && re_exec (so -> lm.o_path))
+ {
+ so -> from_tty = from_tty;
+ if (so -> symbols_loaded)
+ {
+ if (from_tty)
+ {
+ printf_unfiltered ("Symbols already loaded for %s\n", so -> lm.o_path);
+ }
+ }
+ else if (catch_errors
+ (symbol_add_stub, (char *) so,
+ "Error while reading shared library symbols:\n",
+ RETURN_MASK_ALL))
+ {
+ so_last = so;
+ so -> symbols_loaded = 1;
+ }
+ }
+ }
+
+ /* Getting new symbols may change our opinion about what is
+ frameless. */
+ if (so_last)
+ reinit_frame_cache ();
}
/*
{
if (so -> lm.o_path[0])
{
- if ((address >= (CORE_ADDR) so->lm.o_base_address) &&
+ if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
(address < (CORE_ADDR) so -> lmend))
{
return (1);
DESCRIPTION
- Both the SunOS and the SVR4 dynamic linkers have, as part of their
- debugger interface, support for arranging for the inferior to hit
- a breakpoint after mapping in the shared libraries. This function
- enables that breakpoint.
-
- For SunOS, there is a special flag location (in_debugger) which we
- set to 1. When the dynamic linker sees this flag set, it will set
- a breakpoint at a location known only to itself, after saving the
- original contents of that place and the breakpoint address itself,
- in it's own internal structures. When we resume the inferior, it
- will eventually take a SIGTRAP when it runs into the breakpoint.
- We handle this (in a different place) by restoring the contents of
- the breakpointed location (which is only known after it stops),
- chasing around to locate the shared libraries that have been
- loaded, then resuming.
-
- For SVR4, the debugger interface structure contains a member (r_brk)
- which is statically initialized at the time the shared library is
- built, to the offset of a function (_r_debug_state) which is guaran-
- teed to be called once before mapping in a library, and again when
- the mapping is complete. At the time we are examining this member,
- it contains only the unrelocated offset of the function, so we have
- to do our own relocation. Later, when the dynamic linker actually
- runs, it relocates r_brk to be the actual address of _r_debug_state().
-
- The debugger interface structure also contains an enumeration which
- is set to either RT_ADD or RT_DELETE prior to changing the mapping,
- depending upon whether or not the library is being mapped or unmapped,
- and then set to RT_CONSISTENT after the library is mapped/unmapped.
-
- Irix 5, on the other hand, has no such features. Instead, we
- set a breakpoint at main.
+ This functions inserts a breakpoint at the entry point of the
+ main executable, where all shared libraries are mapped in.
*/
static int
enable_break ()
{
- int success = 0;
- struct minimal_symbol *msymbol;
- char **bkpt_namep;
- CORE_ADDR bkpt_addr;
-
- /* Scan through the list of symbols, trying to look up the symbol and
- set a breakpoint there. Terminate loop when we/if we succeed. */
-
- breakpoint_addr = 0;
- for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++)
+ if (symfile_objfile != NULL
+ && target_insert_breakpoint (symfile_objfile->ei.entry_point,
+ shadow_contents) == 0)
{
- msymbol = lookup_minimal_symbol (*bkpt_namep, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
- {
- bkpt_addr = SYMBOL_VALUE_ADDRESS (msymbol);
-#ifdef SOLIB_BKPT_OFFSET
- /* We only want to skip if bkpt_addr is currently pointing
- at a GP setting instruction. */
- {
- char buf[4];
-
- if (target_read_memory (bkpt_addr, buf, 4) == 0)
- {
- unsigned long insn;
-
- insn = extract_unsigned_integer (buf, 4);
- if ((insn & 0xffff0000) == 0x3c1c0000) /* lui $gp,n */
- bkpt_addr += SOLIB_BKPT_OFFSET;
- }
- }
-#endif
- if (target_insert_breakpoint (bkpt_addr, shadow_contents) == 0)
- {
- breakpoint_addr = bkpt_addr;
- success = 1;
- break;
- }
- }
+ breakpoint_addr = symfile_objfile->ei.entry_point;
+ return 1;
}
- return (success);
+ return 0;
}
/*
wait_for_inferior ();
}
while (stop_signal != SIGTRAP);
- stop_soon_quietly = 0;
/* We are now either at the "mapping complete" breakpoint (or somewhere
else, a condition we aren't prepared to deal with anyway), so adjust
warning ("shared library handler failed to disable breakpoint");
}
+ /* solib_add will call reinit_frame_cache.
+ But we are stopped in the startup code and we might not have symbols
+ for the startup code, so heuristic_proc_start could be called
+ and will put out an annoying warning.
+ Delaying the resetting of stop_soon_quietly until after symbol loading
+ suppresses the warning. */
solib_add ((char *) 0, 0, (struct target_ops *) 0);
+ stop_soon_quietly = 0;
}
/*
projects / binutils-gdb.git / blobdiff