/* Handle SVR4 shared libraries for GDB, the GNU Debugger.
- Copyright (C) 1990-2013 Free Software Foundation, Inc.
+ Copyright (C) 1990-2014 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbcore.h"
#include "target.h"
#include "inferior.h"
+#include "infrun.h"
#include "regcache.h"
#include "gdbthread.h"
#include "observer.h"
-#include "gdb_assert.h"
-
#include "solist.h"
#include "solib.h"
#include "solib-svr4.h"
#include "elf-bfd.h"
#include "exec.h"
#include "auxv.h"
-#include "exceptions.h"
#include "gdb_bfd.h"
#include "probe.h"
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);
- if (info == NULL)
- return;
+ struct svr4_info *info = arg;
free_probes_table (info);
free_solib_list (info);
if (info != NULL)
return info;
- info = XZALLOC (struct svr4_info);
+ info = XCNEW (struct svr4_info);
set_program_space_data (current_program_space, solib_svr4_pspace_data, info);
return info;
}
}
-/* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is
- returned and the corresponding PTR is set. */
+/* Scan for DESIRED_DYNTAG in .dynamic section of ABFD. If DESIRED_DYNTAG is
+ found, 1 is returned and the corresponding PTR is set. */
static int
-scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr)
+scan_dyntag (const int desired_dyntag, bfd *abfd, CORE_ADDR *ptr)
{
int arch_size, step, sect_size;
- long dyn_tag;
+ long current_dyntag;
CORE_ADDR dyn_ptr, dyn_addr;
gdb_byte *bufend, *bufstart, *buf;
Elf32_External_Dyn *x_dynp_32;
if (arch_size == 32)
{
x_dynp_32 = (Elf32_External_Dyn *) buf;
- dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag);
+ current_dyntag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag);
dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr);
}
else
{
x_dynp_64 = (Elf64_External_Dyn *) buf;
- dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag);
+ current_dyntag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag);
dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr);
}
- if (dyn_tag == DT_NULL)
+ if (current_dyntag == DT_NULL)
return 0;
- if (dyn_tag == dyntag)
+ if (current_dyntag == desired_dyntag)
{
/* If requested, try to read the runtime value of this .dynamic
entry. */
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. */
+/* Scan for DESIRED_DYNTAG in .dynamic section of the target's main executable,
+ found by consulting the OS auxillary vector. If DESIRED_DYNTAG is found, 1
+ is returned and the corresponding PTR is set. */
static int
-scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr)
+scan_dyntag_auxv (const int desired_dyntag, CORE_ADDR *ptr)
{
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
int sect_size, arch_size, step;
- long dyn_tag;
+ long current_dyntag;
CORE_ADDR dyn_ptr;
gdb_byte *bufend, *bufstart, *buf;
{
Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf;
- dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag,
+ current_dyntag = 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);
{
Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf;
- dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag,
+ current_dyntag = 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)
+ if (current_dyntag == DT_NULL)
break;
- if (dyn_tag == dyntag)
+ if (current_dyntag == desired_dyntag)
{
if (ptr)
*ptr = dyn_ptr;
static CORE_ADDR
elf_locate_base (void)
{
- struct minimal_symbol *msymbol;
+ struct bound_minimal_symbol msymbol;
CORE_ADDR dyn_ptr;
/* Look for DT_MIPS_RLD_MAP first. MIPS executables use this
/* This may be a static executable. Look for the symbol
conventionally named _r_debug, as a last resort. */
msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile);
- if (msymbol != NULL)
- return SYMBOL_VALUE_ADDRESS (msymbol);
+ if (msymbol.minsym != NULL)
+ return BMSYMBOL_VALUE_ADDRESS (msymbol);
/* DT_DEBUG entry not found. */
return 0;
if (!ldsomap)
return 0;
- new = XZALLOC (struct so_list);
+ new = XCNEW (struct so_list);
old_chain = make_cleanup (xfree, new);
new->lm_info = lm_info_read (ldsomap);
make_cleanup (xfree, new->lm_info);
ULONGEST *l_ldp = xml_find_attribute (attributes, "l_ld")->value;
struct so_list *new_elem;
- new_elem = XZALLOC (struct so_list);
- new_elem->lm_info = XZALLOC (struct lm_info);
+ new_elem = XCNEW (struct so_list);
+ new_elem->lm_info = XCNEW (struct lm_info);
new_elem->lm_info->lm_addr = *lmp;
new_elem->lm_info->l_addr_inferior = *l_addrp;
new_elem->lm_info->l_ld = *l_ldp;
memset (list, 0, sizeof (*list));
list->tailp = &list->head;
- if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd",
+ if (gdb_xml_parse_quick (_("target library list"), "library-list-svr4.dtd",
svr4_library_list_elements, document, list) == 0)
{
/* Parsed successfully, keep the result. */
if (!info->debug_loader_offset_p)
return NULL;
- new = XZALLOC (struct so_list);
+ new = XCNEW (struct so_list);
new->lm_info = xzalloc (sizeof (struct lm_info));
svr4_read_so_list (CORE_ADDR lm, CORE_ADDR prev_lm,
struct so_list ***link_ptr_ptr, int ignore_first)
{
+ CORE_ADDR first_l_name = 0;
CORE_ADDR next_lm;
for (; lm != 0; prev_lm = lm, lm = next_lm)
int errcode;
char *buffer;
- new = XZALLOC (struct so_list);
+ new = XCNEW (struct so_list);
old_chain = make_cleanup_free_so (new);
new->lm_info = lm_info_read (lm);
{
struct svr4_info *info = get_svr4_info ();
+ first_l_name = new->lm_info->l_name;
info->main_lm_addr = new->lm_info->lm_addr;
do_cleanups (old_chain);
continue;
SO_NAME_MAX_PATH_SIZE - 1, &errcode);
if (errcode != 0)
{
- warning (_("Can't read pathname for load map: %s."),
- safe_strerror (errcode));
+ /* If this entry's l_name address matches that of the
+ inferior executable, then this is not a normal shared
+ object, but (most likely) a vDSO. In this case, silently
+ skip it; otherwise emit a warning. */
+ if (first_l_name == 0 || new->lm_info->l_name != first_l_name)
+ warning (_("Can't read pathname for load map: %s."),
+ safe_strerror (errcode));
do_cleanups (old_chain);
continue;
}
return head;
}
-/* Implement the "current_sos" target_so_ops method. */
+/* Implement the main part of the "current_sos" target_so_ops
+ method. */
static struct so_list *
-svr4_current_sos (void)
+svr4_current_sos_1 (void)
{
struct svr4_info *info = get_svr4_info ();
return svr4_current_sos_direct (info);
}
+/* Implement the "current_sos" target_so_ops method. */
+
+static struct so_list *
+svr4_current_sos (void)
+{
+ struct so_list *so_head = svr4_current_sos_1 ();
+ struct mem_range vsyscall_range;
+
+ /* Filter out the vDSO module, if present. Its symbol file would
+ not be found on disk. The vDSO/vsyscall's OBJFILE is instead
+ managed by symfile-mem.c:add_vsyscall_page. */
+ if (gdbarch_vsyscall_range (target_gdbarch (), &vsyscall_range)
+ && vsyscall_range.length != 0)
+ {
+ struct so_list **sop;
+
+ sop = &so_head;
+ while (*sop != NULL)
+ {
+ struct so_list *so = *sop;
+
+ /* We can't simply match the vDSO by starting address alone,
+ because lm_info->l_addr_inferior (and also l_addr) do not
+ necessarily represent the real starting address of the
+ ELF if the vDSO's ELF itself is "prelinked". The l_ld
+ field (the ".dynamic" section of the shared object)
+ always points at the absolute/resolved address though.
+ So check whether that address is inside the vDSO's
+ mapping instead.
+
+ E.g., on Linux 3.16 (x86_64) the vDSO is a regular
+ 0-based ELF, and we see:
+
+ (gdb) info auxv
+ 33 AT_SYSINFO_EHDR System-supplied DSO's ELF header 0x7ffff7ffb000
+ (gdb) p/x *_r_debug.r_map.l_next
+ $1 = {l_addr = 0x7ffff7ffb000, ..., l_ld = 0x7ffff7ffb318, ...}
+
+ And on Linux 2.6.32 (x86_64) we see:
+
+ (gdb) info auxv
+ 33 AT_SYSINFO_EHDR System-supplied DSO's ELF header 0x7ffff7ffe000
+ (gdb) p/x *_r_debug.r_map.l_next
+ $5 = {l_addr = 0x7ffff88fe000, ..., l_ld = 0x7ffff7ffe580, ... }
+
+ Dumping that vDSO shows:
+
+ (gdb) info proc mappings
+ 0x7ffff7ffe000 0x7ffff7fff000 0x1000 0 [vdso]
+ (gdb) dump memory vdso.bin 0x7ffff7ffe000 0x7ffff7fff000
+ # readelf -Wa vdso.bin
+ [...]
+ Entry point address: 0xffffffffff700700
+ [...]
+ Section Headers:
+ [Nr] Name Type Address Off Size
+ [ 0] NULL 0000000000000000 000000 000000
+ [ 1] .hash HASH ffffffffff700120 000120 000038
+ [ 2] .dynsym DYNSYM ffffffffff700158 000158 0000d8
+ [...]
+ [ 9] .dynamic DYNAMIC ffffffffff700580 000580 0000f0
+ */
+ if (address_in_mem_range (so->lm_info->l_ld, &vsyscall_range))
+ {
+ *sop = so->next;
+ free_so (so);
+ break;
+ }
+
+ sop = &so->next;
+ }
+ }
+
+ return so_head;
+}
+
/* Get the address of the link_map for a given OBJFILE. */
CORE_ADDR
/* The probe. */
struct probe *probe;
+ /* The relocated address of the probe. */
+ CORE_ADDR address;
+
/* The action. */
enum probe_action action;
};
{
const struct probe_and_action *pa = p;
- return (hashval_t) pa->probe->address;
+ return (hashval_t) pa->address;
}
/* Returns non-zero if the probe_and_actions referenced by p1 and p2
const struct probe_and_action *pa1 = p1;
const struct probe_and_action *pa2 = p2;
- return pa1->probe->address == pa2->probe->address;
+ return pa1->address == pa2->address;
}
/* Register a solib event probe and its associated action in the
probes table. */
static void
-register_solib_event_probe (struct probe *probe, enum probe_action action)
+register_solib_event_probe (struct probe *probe, CORE_ADDR address,
+ enum probe_action action)
{
struct svr4_info *info = get_svr4_info ();
struct probe_and_action lookup, *pa;
xfree, xcalloc, xfree);
lookup.probe = probe;
+ lookup.address = address;
slot = htab_find_slot (info->probes_table, &lookup, INSERT);
gdb_assert (*slot == HTAB_EMPTY_ENTRY);
pa = XCNEW (struct probe_and_action);
pa->probe = probe;
+ pa->address = address;
pa->action = action;
*slot = pa;
static struct probe_and_action *
solib_event_probe_at (struct svr4_info *info, CORE_ADDR address)
{
- struct probe lookup_probe;
struct probe_and_action lookup;
void **slot;
- lookup_probe.address = address;
- lookup.probe = &lookup_probe;
+ lookup.address = address;
slot = htab_find_slot (info->probes_table, &lookup, NO_INSERT);
if (slot == NULL)
{
enum probe_action action;
unsigned probe_argc;
+ struct frame_info *frame = get_current_frame ();
action = pa->action;
if (action == DO_NOTHING || action == PROBES_INTERFACE_FAILED)
arg0: Lmid_t lmid (mandatory)
arg1: struct r_debug *debug_base (mandatory)
arg2: struct link_map *new (optional, for incremental updates) */
- probe_argc = get_probe_argument_count (pa->probe);
+ probe_argc = get_probe_argument_count (pa->probe, frame);
if (probe_argc == 2)
action = FULL_RELOAD;
else if (probe_argc < 2)
struct value *val;
CORE_ADDR pc, debug_base, lm = 0;
int is_initial_ns;
+ struct frame_info *frame = get_current_frame ();
/* Do nothing if not using the probes interface. */
if (info->probes_table == NULL)
usm_chain = make_cleanup (resume_section_map_updates_cleanup,
current_program_space);
- val = evaluate_probe_argument (pa->probe, 1);
+ val = evaluate_probe_argument (pa->probe, 1, frame);
if (val == NULL)
{
do_cleanups (old_chain);
if (action == UPDATE_OR_RELOAD)
{
- val = evaluate_probe_argument (pa->probe, 2);
+ val = evaluate_probe_argument (pa->probe, 2, frame);
if (val != NULL)
lm = value_as_address (val);
static void
svr4_create_probe_breakpoints (struct gdbarch *gdbarch,
- VEC (probe_p) **probes)
+ VEC (probe_p) **probes,
+ struct objfile *objfile)
{
int i;
VEC_iterate (probe_p, probes[i], ix, probe);
++ix)
{
- create_solib_event_breakpoint (gdbarch, probe->address);
- register_solib_event_probe (probe, action);
+ CORE_ADDR address = get_probe_address (probe, objfile);
+
+ create_solib_event_breakpoint (gdbarch, address);
+ register_solib_event_probe (probe, address, action);
}
}
}
if (all_probes_found)
- svr4_create_probe_breakpoints (gdbarch, probes);
+ svr4_create_probe_breakpoints (gdbarch, probes, os->objfile);
for (i = 0; i < NUM_PROBES; i++)
VEC_free (probe_p, probes[i]);
static int
enable_break (struct svr4_info *info, int from_tty)
{
- struct minimal_symbol *msymbol;
+ struct bound_minimal_symbol msymbol;
const char * const *bkpt_namep;
asection *interp_sect;
char *interp_name;
for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++)
{
msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ if ((msymbol.minsym != NULL)
+ && (BMSYMBOL_VALUE_ADDRESS (msymbol) != 0))
{
- sym_addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ sym_addr = BMSYMBOL_VALUE_ADDRESS (msymbol);
sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (),
sym_addr,
¤t_target);
for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++)
{
msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ if ((msymbol.minsym != NULL)
+ && (BMSYMBOL_VALUE_ADDRESS (msymbol) != 0))
{
- sym_addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ sym_addr = BMSYMBOL_VALUE_ADDRESS (msymbol);
sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (),
sym_addr,
¤t_target);
if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0)
continue;
+ /* Strip modifies the flags and alignment of PT_GNU_RELRO.
+ CentOS-5 has problems with filesz, memsz as well.
+ See PR 11786. */
+ if (phdr2[i].p_type == PT_GNU_RELRO)
+ {
+ Elf32_External_Phdr tmp_phdr = *phdrp;
+ Elf32_External_Phdr tmp_phdr2 = *phdr2p;
+
+ memset (tmp_phdr.p_filesz, 0, 4);
+ memset (tmp_phdr.p_memsz, 0, 4);
+ memset (tmp_phdr.p_flags, 0, 4);
+ memset (tmp_phdr.p_align, 0, 4);
+ memset (tmp_phdr2.p_filesz, 0, 4);
+ memset (tmp_phdr2.p_memsz, 0, 4);
+ memset (tmp_phdr2.p_flags, 0, 4);
+ memset (tmp_phdr2.p_align, 0, 4);
+
+ if (memcmp (&tmp_phdr, &tmp_phdr2, sizeof (tmp_phdr))
+ == 0)
+ continue;
+ }
+
/* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */
plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt");
if (plt2_asect)
if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0)
continue;
+ /* Strip modifies the flags and alignment of PT_GNU_RELRO.
+ CentOS-5 has problems with filesz, memsz as well.
+ See PR 11786. */
+ if (phdr2[i].p_type == PT_GNU_RELRO)
+ {
+ Elf64_External_Phdr tmp_phdr = *phdrp;
+ Elf64_External_Phdr tmp_phdr2 = *phdr2p;
+
+ memset (tmp_phdr.p_filesz, 0, 8);
+ memset (tmp_phdr.p_memsz, 0, 8);
+ memset (tmp_phdr.p_flags, 0, 4);
+ memset (tmp_phdr.p_align, 0, 8);
+ memset (tmp_phdr2.p_filesz, 0, 8);
+ memset (tmp_phdr2.p_memsz, 0, 8);
+ memset (tmp_phdr2.p_flags, 0, 4);
+ memset (tmp_phdr2.p_align, 0, 8);
+
+ if (memcmp (&tmp_phdr, &tmp_phdr2, sizeof (tmp_phdr))
+ == 0)
+ continue;
+ }
+
/* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */
plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt");
if (plt2_asect)
projects / platform / upstream / binutils.git / blobdiff