/* Handle SVR4 shared libraries for GDB, the GNU Debugger.
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
- 2001, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+ 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbcore.h"
#include "target.h"
#include "inferior.h"
+#include "regcache.h"
+#include "gdbthread.h"
+#include "observer.h"
#include "gdb_assert.h"
#include "elf-bfd.h"
#include "exec.h"
#include "auxv.h"
+#include "exceptions.h"
static struct link_map_offsets *svr4_fetch_link_map_offsets (void);
static int svr4_have_link_map_offsets (void);
address changes, we may need a different offset, we want to
warn about the difference and compute it only once. */
CORE_ADDR l_addr;
+
+ /* The target location of lm. */
+ CORE_ADDR lm_addr;
};
/* On SVR4 systems, a list of symbols in the dynamic linker where
NULL
};
-#define BKPT_AT_SYMBOL 1
-
-#if defined (BKPT_AT_SYMBOL)
static char *bkpt_names[] =
{
-#ifdef SOLIB_BKPT_NAME
- SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */
-#endif
"_start",
"__start",
"main",
NULL
};
-#endif
static char *main_name_list[] =
{
NULL
};
+/* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent
+ the same shared library. */
+
+static int
+svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name)
+{
+ if (strcmp (gdb_so_name, inferior_so_name) == 0)
+ return 1;
+
+ /* On Solaris, when starting inferior we think that dynamic linker is
+ /usr/lib/ld.so.1, but later on, the table of loaded shared libraries
+ contains /lib/ld.so.1. Sometimes one file is a link to another, but
+ sometimes they have identical content, but are not linked to each
+ other. We don't restrict this check for Solaris, but the chances
+ of running into this situation elsewhere are very low. */
+ if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0
+ && strcmp (inferior_so_name, "/lib/ld.so.1") == 0)
+ return 1;
+
+ /* Similarly, we observed the same issue with sparc64, but with
+ different locations. */
+ if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0
+ && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0)
+ return 1;
+
+ return 0;
+}
+
+static int
+svr4_same (struct so_list *gdb, struct so_list *inferior)
+{
+ return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name));
+}
+
/* link map access functions */
static CORE_ADDR
LM_ADDR_FROM_LINK_MAP (struct so_list *so)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
return extract_typed_address (so->lm_info->lm + lmo->l_addr_offset,
- builtin_type_void_data_ptr);
+ ptr_type);
}
static int
-HAS_LM_DYNAMIC_FROM_LINK_MAP ()
+HAS_LM_DYNAMIC_FROM_LINK_MAP (void)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
LM_DYNAMIC_FROM_LINK_MAP (struct so_list *so)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
return extract_typed_address (so->lm_info->lm + lmo->l_ld_offset,
- builtin_type_void_data_ptr);
+ ptr_type);
}
static CORE_ADDR
LM_NEXT (struct so_list *so)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
return extract_typed_address (so->lm_info->lm + lmo->l_next_offset,
- builtin_type_void_data_ptr);
+ ptr_type);
}
static CORE_ADDR
LM_NAME (struct so_list *so)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
return extract_typed_address (so->lm_info->lm + lmo->l_name_offset,
- builtin_type_void_data_ptr);
+ ptr_type);
}
static int
IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
/* Assume that everything is a library if the dynamic loader was loaded
late by a static executable. */
- if (bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL)
+ if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL)
return 0;
return extract_typed_address (so->lm_info->lm + lmo->l_prev_offset,
- builtin_type_void_data_ptr) == 0;
+ ptr_type) == 0;
}
-static CORE_ADDR debug_base; /* Base of dynamic linker structures */
+/* Per pspace SVR4 specific data. */
+
+struct svr4_info
+{
+ CORE_ADDR debug_base; /* Base of dynamic linker structures */
-/* Validity flag for debug_loader_offset. */
-static int debug_loader_offset_p;
+ /* Validity flag for debug_loader_offset. */
+ int debug_loader_offset_p;
-/* Load address for the dynamic linker, inferred. */
-static CORE_ADDR debug_loader_offset;
+ /* Load address for the dynamic linker, inferred. */
+ CORE_ADDR debug_loader_offset;
-/* Name of the dynamic linker, valid if debug_loader_offset_p. */
-static char *debug_loader_name;
+ /* Name of the dynamic linker, valid if debug_loader_offset_p. */
+ char *debug_loader_name;
+
+ /* Load map address for the main executable. */
+ CORE_ADDR main_lm_addr;
+
+ CORE_ADDR interp_text_sect_low;
+ CORE_ADDR interp_text_sect_high;
+ CORE_ADDR interp_plt_sect_low;
+ CORE_ADDR interp_plt_sect_high;
+};
+
+/* Per-program-space data key. */
+static const struct program_space_data *solib_svr4_pspace_data;
+
+static void
+svr4_pspace_data_cleanup (struct program_space *pspace, void *arg)
+{
+ struct svr4_info *info;
+
+ info = program_space_data (pspace, solib_svr4_pspace_data);
+ xfree (info);
+}
+
+/* Get the current svr4 data. If none is found yet, add it now. This
+ function always returns a valid object. */
+
+static struct svr4_info *
+get_svr4_info (void)
+{
+ struct svr4_info *info;
+
+ info = program_space_data (current_program_space, solib_svr4_pspace_data);
+ if (info != NULL)
+ return info;
+
+ info = XZALLOC (struct svr4_info);
+ set_program_space_data (current_program_space, solib_svr4_pspace_data, info);
+ return info;
+}
/* Local function prototypes */
return symaddr;
}
+
+/* Read program header TYPE from inferior memory. The header is found
+ by scanning the OS auxillary vector.
+
+ Return a pointer to allocated memory holding the program header contents,
+ or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the
+ size of those contents is returned to P_SECT_SIZE. Likewise, the target
+ architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */
+
+static gdb_byte *
+read_program_header (int type, int *p_sect_size, int *p_arch_size)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ CORE_ADDR at_phdr, at_phent, at_phnum;
+ int arch_size, sect_size;
+ CORE_ADDR sect_addr;
+ gdb_byte *buf;
+
+ /* Get required auxv elements from target. */
+ if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0)
+ return 0;
+ if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0)
+ return 0;
+ if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0)
+ return 0;
+ if (!at_phdr || !at_phnum)
+ return 0;
+
+ /* Determine ELF architecture type. */
+ if (at_phent == sizeof (Elf32_External_Phdr))
+ arch_size = 32;
+ else if (at_phent == sizeof (Elf64_External_Phdr))
+ arch_size = 64;
+ else
+ return 0;
+
+ /* Find .dynamic section via the PT_DYNAMIC PHDR. */
+ if (arch_size == 32)
+ {
+ Elf32_External_Phdr phdr;
+ int i;
+
+ /* Search for requested PHDR. */
+ for (i = 0; i < at_phnum; i++)
+ {
+ if (target_read_memory (at_phdr + i * sizeof (phdr),
+ (gdb_byte *)&phdr, sizeof (phdr)))
+ return 0;
+
+ if (extract_unsigned_integer ((gdb_byte *)phdr.p_type,
+ 4, byte_order) == type)
+ break;
+ }
+
+ if (i == at_phnum)
+ return 0;
+
+ /* Retrieve address and size. */
+ sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr,
+ 4, byte_order);
+ sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz,
+ 4, byte_order);
+ }
+ else
+ {
+ Elf64_External_Phdr phdr;
+ int i;
+
+ /* Search for requested PHDR. */
+ for (i = 0; i < at_phnum; i++)
+ {
+ if (target_read_memory (at_phdr + i * sizeof (phdr),
+ (gdb_byte *)&phdr, sizeof (phdr)))
+ return 0;
+
+ if (extract_unsigned_integer ((gdb_byte *)phdr.p_type,
+ 4, byte_order) == type)
+ break;
+ }
+
+ if (i == at_phnum)
+ return 0;
+
+ /* Retrieve address and size. */
+ sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr,
+ 8, byte_order);
+ sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz,
+ 8, byte_order);
+ }
+
+ /* Read in requested program header. */
+ buf = xmalloc (sect_size);
+ if (target_read_memory (sect_addr, buf, sect_size))
+ {
+ xfree (buf);
+ return NULL;
+ }
+
+ if (p_arch_size)
+ *p_arch_size = arch_size;
+ if (p_sect_size)
+ *p_sect_size = sect_size;
+
+ return buf;
+}
+
+
+/* Return program interpreter string. */
+static gdb_byte *
+find_program_interpreter (void)
+{
+ gdb_byte *buf = NULL;
+
+ /* If we have an exec_bfd, use its section table. */
+ if (exec_bfd
+ && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
+ {
+ struct bfd_section *interp_sect;
+
+ interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
+ if (interp_sect != NULL)
+ {
+ CORE_ADDR sect_addr = bfd_section_vma (exec_bfd, interp_sect);
+ int sect_size = bfd_section_size (exec_bfd, interp_sect);
+
+ buf = xmalloc (sect_size);
+ bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size);
+ }
+ }
+
+ /* If we didn't find it, use the target auxillary vector. */
+ if (!buf)
+ buf = read_program_header (PT_INTERP, NULL, NULL);
+
+ return buf;
+}
+
+
/* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is
returned and the corresponding PTR is set. */
if (abfd == NULL)
return 0;
+
+ if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
+ return 0;
+
arch_size = bfd_get_arch_size (abfd);
if (arch_size == -1)
- return 0;
+ return 0;
/* Find the start address of the .dynamic section. */
sect = bfd_get_section_by_name (abfd, ".dynamic");
entry. */
if (ptr)
{
+ struct type *ptr_type;
gdb_byte ptr_buf[8];
CORE_ADDR ptr_addr;
+ ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8;
if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0)
- dyn_ptr = extract_typed_address (ptr_buf,
- builtin_type_void_data_ptr);
+ dyn_ptr = extract_typed_address (ptr_buf, ptr_type);
*ptr = dyn_ptr;
}
return 1;
return 0;
}
+/* Scan for DYNTAG in .dynamic section of the target's main executable,
+ found by consulting the OS auxillary vector. If DYNTAG is found 1 is
+ returned and the corresponding PTR is set. */
+
+static int
+scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ int sect_size, arch_size, step;
+ long dyn_tag;
+ CORE_ADDR dyn_ptr;
+ gdb_byte *bufend, *bufstart, *buf;
+
+ /* Read in .dynamic section. */
+ buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size);
+ if (!buf)
+ return 0;
+
+ /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
+ step = (arch_size == 32) ? sizeof (Elf32_External_Dyn)
+ : sizeof (Elf64_External_Dyn);
+ for (bufend = buf + sect_size;
+ buf < bufend;
+ buf += step)
+ {
+ if (arch_size == 32)
+ {
+ Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf;
+ dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag,
+ 4, byte_order);
+ dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr,
+ 4, byte_order);
+ }
+ else
+ {
+ Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf;
+ dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag,
+ 8, byte_order);
+ dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr,
+ 8, byte_order);
+ }
+ if (dyn_tag == DT_NULL)
+ break;
+
+ if (dyn_tag == dyntag)
+ {
+ if (ptr)
+ *ptr = dyn_ptr;
+
+ xfree (bufstart);
+ return 1;
+ }
+ }
+
+ xfree (bufstart);
+ return 0;
+}
+
/*
/* Look for DT_MIPS_RLD_MAP first. MIPS executables use this
instead of DT_DEBUG, although they sometimes contain an unused
DT_DEBUG. */
- if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr))
+ if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr)
+ || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr))
{
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
gdb_byte *pbuf;
- int pbuf_size = TYPE_LENGTH (builtin_type_void_data_ptr);
+ int pbuf_size = TYPE_LENGTH (ptr_type);
pbuf = alloca (pbuf_size);
/* DT_MIPS_RLD_MAP contains a pointer to the address
of the dynamic link structure. */
if (target_read_memory (dyn_ptr, pbuf, pbuf_size))
return 0;
- return extract_typed_address (pbuf, builtin_type_void_data_ptr);
+ return extract_typed_address (pbuf, ptr_type);
}
/* Find DT_DEBUG. */
- if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr))
+ if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr)
+ || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr))
return dyn_ptr;
/* This may be a static executable. Look for the symbol
SYNOPSIS
- CORE_ADDR locate_base (void)
+ CORE_ADDR locate_base (struct svr4_info *)
DESCRIPTION
*/
static CORE_ADDR
-locate_base (void)
+locate_base (struct svr4_info *info)
{
/* Check to see if we have a currently valid address, and if so, avoid
doing all this work again and just return the cached address. If
section for ELF executables. There's no point in doing any of this
though if we don't have some link map offsets to work with. */
- if (debug_base == 0 && svr4_have_link_map_offsets ())
- {
- if (exec_bfd != NULL
- && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
- debug_base = elf_locate_base ();
- }
- return (debug_base);
+ if (info->debug_base == 0 && svr4_have_link_map_offsets ())
+ info->debug_base = elf_locate_base ();
+ return info->debug_base;
}
/* Find the first element in the inferior's dynamic link map, and
RT_CONSISTENT. */
static CORE_ADDR
-solib_svr4_r_map (void)
+solib_svr4_r_map (struct svr4_info *info)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
- return read_memory_typed_address (debug_base + lmo->r_map_offset,
- builtin_type_void_data_ptr);
+ return read_memory_typed_address (info->debug_base + lmo->r_map_offset,
+ ptr_type);
+}
+
+/* Find r_brk from the inferior's debug base. */
+
+static CORE_ADDR
+solib_svr4_r_brk (struct svr4_info *info)
+{
+ struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+
+ return read_memory_typed_address (info->debug_base + lmo->r_brk_offset,
+ ptr_type);
}
/* Find the link map for the dynamic linker (if it is not in the
normal list of loaded shared objects). */
static CORE_ADDR
-solib_svr4_r_ldsomap (void)
+solib_svr4_r_ldsomap (struct svr4_info *info)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
ULONGEST version;
/* Check version, and return zero if `struct r_debug' doesn't have
the r_ldsomap member. */
- version = read_memory_unsigned_integer (debug_base + lmo->r_version_offset,
- lmo->r_version_size);
+ version
+ = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset,
+ lmo->r_version_size, byte_order);
if (version < 2 || lmo->r_ldsomap_offset == -1)
return 0;
- return read_memory_typed_address (debug_base + lmo->r_ldsomap_offset,
- builtin_type_void_data_ptr);
+ return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset,
+ ptr_type);
+}
+
+/* On Solaris systems with some versions of the dynamic linker,
+ ld.so's l_name pointer points to the SONAME in the string table
+ rather than into writable memory. So that GDB can find shared
+ libraries when loading a core file generated by gcore, ensure that
+ memory areas containing the l_name string are saved in the core
+ file. */
+
+static int
+svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size)
+{
+ struct svr4_info *info;
+ CORE_ADDR ldsomap;
+ struct so_list *new;
+ struct cleanup *old_chain;
+ struct link_map_offsets *lmo;
+ CORE_ADDR lm_name;
+
+ info = get_svr4_info ();
+
+ info->debug_base = 0;
+ locate_base (info);
+ if (!info->debug_base)
+ return 0;
+
+ ldsomap = solib_svr4_r_ldsomap (info);
+ if (!ldsomap)
+ return 0;
+
+ lmo = svr4_fetch_link_map_offsets ();
+ new = XZALLOC (struct so_list);
+ old_chain = make_cleanup (xfree, new);
+ new->lm_info = xmalloc (sizeof (struct lm_info));
+ make_cleanup (xfree, new->lm_info);
+ new->lm_info->l_addr = (CORE_ADDR)-1;
+ new->lm_info->lm_addr = ldsomap;
+ new->lm_info->lm = xzalloc (lmo->link_map_size);
+ make_cleanup (xfree, new->lm_info->lm);
+ read_memory (ldsomap, new->lm_info->lm, lmo->link_map_size);
+ lm_name = LM_NAME (new);
+ do_cleanups (old_chain);
+
+ return (lm_name >= vaddr && lm_name < vaddr + size);
}
/*
int errcode;
int from_tty = *(int *)from_ttyp;
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
- int l_name_size = TYPE_LENGTH (builtin_type_void_data_ptr);
+ struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+ int l_name_size = TYPE_LENGTH (ptr_type);
gdb_byte *l_name_buf = xmalloc (l_name_size);
struct cleanup *cleanups = make_cleanup (xfree, l_name_buf);
+ struct svr4_info *info = get_svr4_info ();
if (symfile_objfile)
- if (!query ("Attempt to reload symbols from process? "))
+ if (!query (_("Attempt to reload symbols from process? ")))
return 0;
- if ((debug_base = locate_base ()) == 0)
+ /* Always locate the debug struct, in case it has moved. */
+ info->debug_base = 0;
+ if (locate_base (info) == 0)
return 0; /* failed somehow... */
/* First link map member should be the executable. */
- lm = solib_svr4_r_map ();
+ lm = solib_svr4_r_map (info);
if (lm == 0)
return 0; /* failed somehow... */
read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size);
/* Convert the address to host format. */
- l_name = extract_typed_address (l_name_buf, builtin_type_void_data_ptr);
+ l_name = extract_typed_address (l_name_buf, ptr_type);
/* Free l_name_buf. */
do_cleanups (cleanups);
static struct so_list *
svr4_default_sos (void)
{
+ struct svr4_info *info = get_svr4_info ();
+
struct so_list *head = NULL;
struct so_list **link_ptr = &head;
- if (debug_loader_offset_p)
+ if (info->debug_loader_offset_p)
{
struct so_list *new = XZALLOC (struct so_list);
/* Nothing will ever check the cached copy of the link
map if we set l_addr. */
- new->lm_info->l_addr = debug_loader_offset;
+ new->lm_info->l_addr = info->debug_loader_offset;
+ new->lm_info->lm_addr = 0;
new->lm_info->lm = NULL;
- strncpy (new->so_name, debug_loader_name, SO_NAME_MAX_PATH_SIZE - 1);
+ strncpy (new->so_name, info->debug_loader_name,
+ SO_NAME_MAX_PATH_SIZE - 1);
new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
strcpy (new->so_original_name, new->so_name);
struct so_list *head = 0;
struct so_list **link_ptr = &head;
CORE_ADDR ldsomap = 0;
+ struct svr4_info *info;
- /* Make sure we've looked up the inferior's dynamic linker's base
- structure. */
- if (! debug_base)
- {
- debug_base = locate_base ();
+ info = get_svr4_info ();
- /* If we can't find the dynamic linker's base structure, this
- must not be a dynamically linked executable. Hmm. */
- if (! debug_base)
- return svr4_default_sos ();
- }
+ /* Always locate the debug struct, in case it has moved. */
+ info->debug_base = 0;
+ locate_base (info);
+
+ /* If we can't find the dynamic linker's base structure, this
+ must not be a dynamically linked executable. Hmm. */
+ if (! info->debug_base)
+ return svr4_default_sos ();
/* Walk the inferior's link map list, and build our list of
`struct so_list' nodes. */
- lm = solib_svr4_r_map ();
+ lm = solib_svr4_r_map (info);
while (lm)
{
make_cleanup (xfree, new->lm_info);
new->lm_info->l_addr = (CORE_ADDR)-1;
+ new->lm_info->lm_addr = lm;
new->lm_info->lm = xzalloc (lmo->link_map_size);
make_cleanup (xfree, new->lm_info->lm);
does have a name, so we can no longer use a missing name to
decide when to ignore it. */
if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0)
- free_so (new);
+ {
+ info->main_lm_addr = new->lm_info->lm_addr;
+ free_so (new);
+ }
else
{
int errcode;
symbol information for the dynamic linker is quite crucial
for skipping dynamic linker resolver code. */
if (lm == 0 && ldsomap == 0)
- lm = ldsomap = solib_svr4_r_ldsomap ();
+ lm = ldsomap = solib_svr4_r_ldsomap (info);
discard_cleanups (old_chain);
}
return head;
}
-/* Get the address of the link_map for a given OBJFILE. Loop through
- the link maps, and return the address of the one corresponding to
- the given objfile. Note that this function takes into account that
- objfile can be the main executable, not just a shared library. The
- main executable has always an empty name field in the linkmap. */
+/* Get the address of the link_map for a given OBJFILE. */
CORE_ADDR
svr4_fetch_objfile_link_map (struct objfile *objfile)
{
- CORE_ADDR lm;
+ struct so_list *so;
+ struct svr4_info *info = get_svr4_info ();
- if ((debug_base = locate_base ()) == 0)
- return 0; /* failed somehow... */
+ /* Cause svr4_current_sos() to be run if it hasn't been already. */
+ if (info->main_lm_addr == 0)
+ solib_add (NULL, 0, ¤t_target, auto_solib_add);
- /* Position ourselves on the first link map. */
- lm = solib_svr4_r_map ();
- while (lm)
- {
- /* Get info on the layout of the r_debug and link_map structures. */
- struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
- int errcode;
- char *buffer;
- struct lm_info objfile_lm_info;
- struct cleanup *old_chain;
- CORE_ADDR name_address;
- int l_name_size = TYPE_LENGTH (builtin_type_void_data_ptr);
- gdb_byte *l_name_buf = xmalloc (l_name_size);
- old_chain = make_cleanup (xfree, l_name_buf);
-
- /* Set up the buffer to contain the portion of the link_map
- structure that gdb cares about. Note that this is not the
- whole link_map structure. */
- objfile_lm_info.lm = xzalloc (lmo->link_map_size);
- make_cleanup (xfree, objfile_lm_info.lm);
-
- /* Read the link map into our internal structure. */
- read_memory (lm, objfile_lm_info.lm, lmo->link_map_size);
-
- /* Read address of name from target memory to GDB. */
- read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size);
-
- /* Extract this object's name. */
- name_address = extract_typed_address (l_name_buf,
- builtin_type_void_data_ptr);
- target_read_string (name_address, &buffer,
- SO_NAME_MAX_PATH_SIZE - 1, &errcode);
- make_cleanup (xfree, buffer);
- if (errcode != 0)
- warning (_("Can't read pathname for load map: %s."),
- safe_strerror (errcode));
- else
- {
- /* Is this the linkmap for the file we want? */
- /* If the file is not a shared library and has no name,
- we are sure it is the main executable, so we return that. */
-
- if (buffer
- && ((strcmp (buffer, objfile->name) == 0)
- || (!(objfile->flags & OBJF_SHARED)
- && (strcmp (buffer, "") == 0))))
- {
- do_cleanups (old_chain);
- return lm;
- }
- }
- /* Not the file we wanted, continue checking. */
- lm = extract_typed_address (objfile_lm_info.lm + lmo->l_next_offset,
- builtin_type_void_data_ptr);
- do_cleanups (old_chain);
- }
+ /* svr4_current_sos() will set main_lm_addr for the main executable. */
+ if (objfile == symfile_objfile)
+ return info->main_lm_addr;
+
+ /* The other link map addresses may be found by examining the list
+ of shared libraries. */
+ for (so = master_so_list (); so; so = so->next)
+ if (so->objfile == objfile)
+ return so->lm_info->lm_addr;
+
+ /* Not found! */
return 0;
}
/* Return 1 if PC lies in the dynamic symbol resolution code of the
SVR4 run time loader. */
-static CORE_ADDR interp_text_sect_low;
-static CORE_ADDR interp_text_sect_high;
-static CORE_ADDR interp_plt_sect_low;
-static CORE_ADDR interp_plt_sect_high;
int
svr4_in_dynsym_resolve_code (CORE_ADDR pc)
{
- return ((pc >= interp_text_sect_low && pc < interp_text_sect_high)
- || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high)
+ struct svr4_info *info = get_svr4_info ();
+
+ return ((pc >= info->interp_text_sect_low
+ && pc < info->interp_text_sect_high)
+ || (pc >= info->interp_plt_sect_low
+ && pc < info->interp_plt_sect_high)
|| in_plt_section (pc, NULL));
}
gdbarch_convert_from_func_ptr_addr(). The method
gdbarch_convert_from_func_ptr_addr() is the merely the identify
function for targets which don't use function descriptors. */
- return gdbarch_convert_from_func_ptr_addr (current_gdbarch,
+ return gdbarch_convert_from_func_ptr_addr (target_gdbarch,
bfd_get_start_address (abfd),
targ);
}
*/
static int
-enable_break (void)
+enable_break (struct svr4_info *info, int from_tty)
{
-#ifdef BKPT_AT_SYMBOL
-
struct minimal_symbol *msymbol;
char **bkpt_namep;
asection *interp_sect;
+ gdb_byte *interp_name;
+ CORE_ADDR sym_addr;
/* First, remove all the solib event breakpoints. Their addresses
may have changed since the last time we ran the program. */
remove_solib_event_breakpoints ();
- interp_text_sect_low = interp_text_sect_high = 0;
- interp_plt_sect_low = interp_plt_sect_high = 0;
+ info->interp_text_sect_low = info->interp_text_sect_high = 0;
+ info->interp_plt_sect_low = info->interp_plt_sect_high = 0;
+
+ /* If we already have a shared library list in the target, and
+ r_debug contains r_brk, set the breakpoint there - this should
+ mean r_brk has already been relocated. Assume the dynamic linker
+ is the object containing r_brk. */
- /* Find the .interp section; if not found, warn the user and drop
+ solib_add (NULL, from_tty, ¤t_target, auto_solib_add);
+ sym_addr = 0;
+ if (info->debug_base && solib_svr4_r_map (info) != 0)
+ sym_addr = solib_svr4_r_brk (info);
+
+ if (sym_addr != 0)
+ {
+ struct obj_section *os;
+
+ sym_addr = gdbarch_addr_bits_remove
+ (target_gdbarch, gdbarch_convert_from_func_ptr_addr (target_gdbarch,
+ sym_addr,
+ ¤t_target));
+
+ os = find_pc_section (sym_addr);
+ if (os != NULL)
+ {
+ /* Record the relocated start and end address of the dynamic linker
+ text and plt section for svr4_in_dynsym_resolve_code. */
+ bfd *tmp_bfd;
+ CORE_ADDR load_addr;
+
+ tmp_bfd = os->objfile->obfd;
+ load_addr = ANOFFSET (os->objfile->section_offsets,
+ os->objfile->sect_index_text);
+
+ interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
+ if (interp_sect)
+ {
+ info->interp_text_sect_low =
+ bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
+ info->interp_text_sect_high =
+ info->interp_text_sect_low
+ + bfd_section_size (tmp_bfd, interp_sect);
+ }
+ interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
+ if (interp_sect)
+ {
+ info->interp_plt_sect_low =
+ bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
+ info->interp_plt_sect_high =
+ info->interp_plt_sect_low
+ + bfd_section_size (tmp_bfd, interp_sect);
+ }
+
+ create_solib_event_breakpoint (target_gdbarch, sym_addr);
+ return 1;
+ }
+ }
+
+ /* Find the program interpreter; if not found, warn the user and drop
into the old breakpoint at symbol code. */
- interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
- if (interp_sect)
+ interp_name = find_program_interpreter ();
+ if (interp_name)
{
- unsigned int interp_sect_size;
- char *buf;
CORE_ADDR load_addr = 0;
int load_addr_found = 0;
int loader_found_in_list = 0;
struct so_list *so;
bfd *tmp_bfd = NULL;
struct target_ops *tmp_bfd_target;
- int tmp_fd = -1;
- char *tmp_pathname = NULL;
- CORE_ADDR sym_addr = 0;
+ volatile struct gdb_exception ex;
- /* Read the contents of the .interp section into a local buffer;
- the contents specify the dynamic linker this program uses. */
- interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
- buf = alloca (interp_sect_size);
- bfd_get_section_contents (exec_bfd, interp_sect,
- buf, 0, interp_sect_size);
+ sym_addr = 0;
/* Now we need to figure out where the dynamic linker was
loaded so that we can load its symbols and place a breakpoint
be trivial on GNU/Linux). Therefore, we have to try an alternate
mechanism to find the dynamic linker's base address. */
- tmp_fd = solib_open (buf, &tmp_pathname);
- if (tmp_fd >= 0)
- tmp_bfd = bfd_fopen (tmp_pathname, gnutarget, FOPEN_RB, tmp_fd);
-
+ TRY_CATCH (ex, RETURN_MASK_ALL)
+ {
+ tmp_bfd = solib_bfd_open (interp_name);
+ }
if (tmp_bfd == NULL)
goto bkpt_at_symbol;
- /* Make sure the dynamic linker's really a useful object. */
- if (!bfd_check_format (tmp_bfd, bfd_object))
- {
- warning (_("Unable to grok dynamic linker %s as an object file"), buf);
- bfd_close (tmp_bfd);
- goto bkpt_at_symbol;
- }
-
/* Now convert the TMP_BFD into a target. That way target, as
well as BFD operations can be used. Note that closing the
target will also close the underlying bfd. */
/* On a running target, we can get the dynamic linker's base
address from the shared library table. */
- solib_add (NULL, 0, ¤t_target, auto_solib_add);
so = master_so_list ();
while (so)
{
- if (strcmp (buf, so->so_original_name) == 0)
+ if (svr4_same_1 (interp_name, so->so_original_name))
{
load_addr_found = 1;
loader_found_in_list = 1;
fallback method because it has actually been working well in
most cases. */
if (!load_addr_found)
- load_addr = (read_pc ()
- - exec_entry_point (tmp_bfd, tmp_bfd_target));
+ {
+ struct regcache *regcache
+ = get_thread_arch_regcache (inferior_ptid, target_gdbarch);
+ load_addr = (regcache_read_pc (regcache)
+ - exec_entry_point (tmp_bfd, tmp_bfd_target));
+ }
if (!loader_found_in_list)
{
- debug_loader_name = xstrdup (buf);
- debug_loader_offset_p = 1;
- debug_loader_offset = load_addr;
- solib_add (NULL, 0, ¤t_target, auto_solib_add);
+ info->debug_loader_name = xstrdup (interp_name);
+ info->debug_loader_offset_p = 1;
+ info->debug_loader_offset = load_addr;
+ solib_add (NULL, from_tty, ¤t_target, auto_solib_add);
}
/* Record the relocated start and end address of the dynamic linker
interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
if (interp_sect)
{
- interp_text_sect_low =
+ info->interp_text_sect_low =
bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
- interp_text_sect_high =
- interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect);
+ info->interp_text_sect_high =
+ info->interp_text_sect_low
+ + bfd_section_size (tmp_bfd, interp_sect);
}
interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
if (interp_sect)
{
- interp_plt_sect_low =
+ info->interp_plt_sect_low =
bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
- interp_plt_sect_high =
- interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect);
+ info->interp_plt_sect_high =
+ info->interp_plt_sect_low
+ + bfd_section_size (tmp_bfd, interp_sect);
}
/* Now try to set a breakpoint in the dynamic linker. */
/* Convert 'sym_addr' from a function pointer to an address.
Because we pass tmp_bfd_target instead of the current
target, this will always produce an unrelocated value. */
- sym_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
+ sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch,
sym_addr,
tmp_bfd_target);
if (sym_addr != 0)
{
- create_solib_event_breakpoint (load_addr + sym_addr);
+ create_solib_event_breakpoint (target_gdbarch, load_addr + sym_addr);
+ xfree (interp_name);
return 1;
}
/* For whatever reason we couldn't set a breakpoint in the dynamic
linker. Warn and drop into the old code. */
bkpt_at_symbol:
- xfree (tmp_pathname);
+ xfree (interp_name);
warning (_("Unable to find dynamic linker breakpoint function.\n"
"GDB will be unable to debug shared library initializers\n"
"and track explicitly loaded dynamic code."));
msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
{
- create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
+ sym_addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch,
+ sym_addr,
+ ¤t_target);
+ create_solib_event_breakpoint (target_gdbarch, sym_addr);
return 1;
}
}
msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
{
- create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
+ sym_addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch,
+ sym_addr,
+ ¤t_target);
+ create_solib_event_breakpoint (target_gdbarch, sym_addr);
return 1;
}
}
-#endif /* BKPT_AT_SYMBOL */
-
return 0;
}
svr4_relocate_main_executable (void)
{
asection *interp_sect;
- CORE_ADDR pc = read_pc ();
+ struct regcache *regcache
+ = get_thread_arch_regcache (inferior_ptid, target_gdbarch);
+ CORE_ADDR pc = regcache_read_pc (regcache);
/* Decide if the objfile needs to be relocated. As indicated above,
we will only be here when execution is stopped at the beginning
SYNOPSIS
- void svr4_solib_create_inferior_hook ()
+ void svr4_solib_create_inferior_hook (int from_tty)
DESCRIPTION
*/
static void
-svr4_solib_create_inferior_hook (void)
+svr4_solib_create_inferior_hook (int from_tty)
{
+ struct inferior *inf;
+ struct thread_info *tp;
+ struct svr4_info *info;
+
+ info = get_svr4_info ();
+
/* Relocate the main executable if necessary. */
svr4_relocate_main_executable ();
if (!svr4_have_link_map_offsets ())
return;
- if (!enable_break ())
+ if (!enable_break (info, from_tty))
return;
#if defined(_SCO_DS)
can go groveling around in the dynamic linker structures to find
out what we need to know about them. */
+ inf = current_inferior ();
+ tp = inferior_thread ();
+
clear_proceed_status ();
- stop_soon = STOP_QUIETLY;
- stop_signal = TARGET_SIGNAL_0;
+ inf->stop_soon = STOP_QUIETLY;
+ tp->stop_signal = TARGET_SIGNAL_0;
do
{
- target_resume (pid_to_ptid (-1), 0, stop_signal);
+ target_resume (pid_to_ptid (-1), 0, tp->stop_signal);
wait_for_inferior (0);
}
- while (stop_signal != TARGET_SIGNAL_TRAP);
- stop_soon = NO_STOP_QUIETLY;
+ while (tp->stop_signal != TARGET_SIGNAL_TRAP);
+ inf->stop_soon = NO_STOP_QUIETLY;
#endif /* defined(_SCO_DS) */
}
static void
svr4_clear_solib (void)
{
- debug_base = 0;
- debug_loader_offset_p = 0;
- debug_loader_offset = 0;
- xfree (debug_loader_name);
- debug_loader_name = NULL;
+ struct svr4_info *info;
+
+ info = get_svr4_info ();
+ info->debug_base = 0;
+ info->debug_loader_offset_p = 0;
+ info->debug_loader_offset = 0;
+ xfree (info->debug_loader_name);
+ info->debug_loader_name = NULL;
}
static void
static CORE_ADDR
svr4_truncate_ptr (CORE_ADDR addr)
{
- if (gdbarch_ptr_bit (current_gdbarch) == sizeof (CORE_ADDR) * 8)
+ if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8)
/* We don't need to truncate anything, and the bit twiddling below
will fail due to overflow problems. */
return addr;
else
- return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (current_gdbarch)) - 1);
+ return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1);
}
static void
svr4_relocate_section_addresses (struct so_list *so,
- struct section_table *sec)
+ struct target_section *sec)
{
sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so,
sec->bfd));
static struct link_map_offsets *
svr4_fetch_link_map_offsets (void)
{
- struct solib_svr4_ops *ops = gdbarch_data (current_gdbarch, solib_svr4_data);
+ struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data);
gdb_assert (ops->fetch_link_map_offsets);
return ops->fetch_link_map_offsets ();
static int
svr4_have_link_map_offsets (void)
{
- struct solib_svr4_ops *ops = gdbarch_data (current_gdbarch, solib_svr4_data);
+ struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data);
return (ops->fetch_link_map_offsets != NULL);
}
\f
lmo.r_version_offset = 0;
lmo.r_version_size = 4;
lmo.r_map_offset = 4;
+ lmo.r_brk_offset = 8;
lmo.r_ldsomap_offset = 20;
/* Everything we need is in the first 20 bytes. */
lmo.r_version_offset = 0;
lmo.r_version_size = 4;
lmo.r_map_offset = 8;
+ lmo.r_brk_offset = 16;
lmo.r_ldsomap_offset = 40;
/* Everything we need is in the first 40 bytes. */
elf_lookup_lib_symbol (const struct objfile *objfile,
const char *name,
const char *linkage_name,
- const domain_enum domain, struct symtab **symtab)
+ const domain_enum domain)
{
if (objfile->obfd == NULL
|| scan_dyntag (DT_SYMBOLIC, objfile->obfd, NULL) != 1)
return NULL;
return lookup_global_symbol_from_objfile
- (objfile, name, linkage_name, domain, symtab);
-}
-
-static int
-svr4_same (struct so_list *gdb, struct so_list *inferior)
-{
- if (! strcmp (gdb->so_original_name, inferior->so_original_name))
- return 1;
-
- /* On Solaris, when starting inferior we think that dynamic linker is
- /usr/lib/ld.so.1, but later on, the table of loaded shared libraries
- contains /lib/ld.so.1. Sometimes one file is a link to another, but
- sometimes they have identical content, but are not linked to each
- other. We don't restrict this check for Solaris, but the chances
- of running into this situation elsewhere are very low. */
- if (strcmp (gdb->so_original_name, "/usr/lib/ld.so.1") == 0
- && strcmp (inferior->so_original_name, "/lib/ld.so.1") == 0)
- return 1;
-
- return 0;
+ (objfile, name, linkage_name, domain);
}
extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */
_initialize_svr4_solib (void)
{
solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init);
+ solib_svr4_pspace_data
+ = register_program_space_data_with_cleanup (svr4_pspace_data_cleanup);
svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses;
svr4_so_ops.free_so = svr4_free_so;
svr4_so_ops.current_sos = svr4_current_sos;
svr4_so_ops.open_symbol_file_object = open_symbol_file_object;
svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code;
+ svr4_so_ops.bfd_open = solib_bfd_open;
svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol;
svr4_so_ops.same = svr4_same;
+ svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core;
}