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binutils-gdb/gdb/compile/compile-object-load.c
Simon Marchi 50888e42dc gdb: change functions returning value contents to use gdb::array_view 
The bug fixed by this [1] patch was caused by an out-of-bounds access to
a value's content.  The code gets the value's content (just a pointer)
and then indexes it with a non-sensical index.

This made me think of changing functions that return value contents to
return array_views instead of a plain pointer.  This has the advantage
that when GDB is built with _GLIBCXX_DEBUG, accesses to the array_view
are checked, making bugs more apparent / easier to find.

This patch changes the return types of these functions, and updates
callers to call .data() on the result, meaning it's not changing
anything in practice.  Additional work will be needed (which can be done
little by little) to make callers propagate the use of array_view and
reap the benefits.

[1] https://sourceware.org/pipermail/gdb-patches/2021-September/182306.html

Change-Id: I5151f888f169e1c36abe2cbc57620110673816f3
2021-10-25 14:51:44 -04:00

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/* Load module for 'compile' command.
Copyright (C) 2014-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "compile-object-load.h"
#include "compile-internal.h"
#include "command.h"
#include "objfiles.h"
#include "gdbcore.h"
#include "readline/tilde.h"
#include "bfdlink.h"
#include "gdbcmd.h"
#include "regcache.h"
#include "inferior.h"
#include "gdbthread.h"
#include "compile.h"
#include "block.h"
#include "arch-utils.h"
#include <algorithm>
/* Add inferior mmap memory range ADDR..ADDR+SIZE (exclusive) to the
list. */
void
munmap_list::add (CORE_ADDR addr, CORE_ADDR size)
{
struct munmap_item item = { addr, size };
items.push_back (item);
}
/* Destroy an munmap_list. */
munmap_list::~munmap_list ()
{
for (auto &item : items)
{
try
{
gdbarch_infcall_munmap (target_gdbarch (), item.addr, item.size);
}
catch (const gdb_exception_error &ex)
{
/* There's not much the user can do, so just ignore
this. */
}
}
}
/* A data structure that is used to lay out sections of our objfile in
inferior memory. */
struct setup_sections_data
{
explicit setup_sections_data (bfd *abfd)
: m_bfd (abfd),
m_last_section_first (abfd->sections)
{
}
/* Place all ABFD sections next to each other obeying all
constraints. */
void setup_one_section (asection *sect);
/* List of inferior mmap ranges where setup_sections should add its
next range. */
struct munmap_list munmap_list;
private:
/* The BFD. */
bfd *m_bfd;
/* Size of all recent sections with matching LAST_PROT. */
CORE_ADDR m_last_size = 0;
/* First section matching LAST_PROT. */
asection *m_last_section_first;
/* Memory protection like the prot parameter of gdbarch_infcall_mmap. */
unsigned m_last_prot = -1;
/* Maximum of alignments of all sections matching LAST_PROT.
This value is always at least 1. This value is always a power of 2. */
CORE_ADDR m_last_max_alignment = -1;
};
/* See setup_sections_data. */
void
setup_sections_data::setup_one_section (asection *sect)
{
CORE_ADDR alignment;
unsigned prot;
if (sect != NULL)
{
/* It is required by later bfd_get_relocated_section_contents. */
if (sect->output_section == NULL)
sect->output_section = sect;
if ((bfd_section_flags (sect) & SEC_ALLOC) == 0)
return;
/* Make the memory always readable. */
prot = GDB_MMAP_PROT_READ;
if ((bfd_section_flags (sect) & SEC_READONLY) == 0)
prot |= GDB_MMAP_PROT_WRITE;
if ((bfd_section_flags (sect) & SEC_CODE) != 0)
prot |= GDB_MMAP_PROT_EXEC;
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"module \"%s\" section \"%s\" size %s prot %u\n",
bfd_get_filename (m_bfd),
bfd_section_name (sect),
paddress (target_gdbarch (),
bfd_section_size (sect)),
prot);
}
else
prot = -1;
if (sect == NULL
|| (m_last_prot != prot && bfd_section_size (sect) != 0))
{
CORE_ADDR addr;
asection *sect_iter;
if (m_last_size != 0)
{
addr = gdbarch_infcall_mmap (target_gdbarch (), m_last_size,
m_last_prot);
munmap_list.add (addr, m_last_size);
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"allocated %s bytes at %s prot %u\n",
paddress (target_gdbarch (), m_last_size),
paddress (target_gdbarch (), addr),
m_last_prot);
}
else
addr = 0;
if ((addr & (m_last_max_alignment - 1)) != 0)
error (_("Inferior compiled module address %s "
"is not aligned to BFD required %s."),
paddress (target_gdbarch (), addr),
paddress (target_gdbarch (), m_last_max_alignment));
for (sect_iter = m_last_section_first; sect_iter != sect;
sect_iter = sect_iter->next)
if ((bfd_section_flags (sect_iter) & SEC_ALLOC) != 0)
bfd_set_section_vma (sect_iter, addr + bfd_section_vma (sect_iter));
m_last_size = 0;
m_last_section_first = sect;
m_last_prot = prot;
m_last_max_alignment = 1;
}
if (sect == NULL)
return;
alignment = ((CORE_ADDR) 1) << bfd_section_alignment (sect);
m_last_max_alignment = std::max (m_last_max_alignment, alignment);
m_last_size = (m_last_size + alignment - 1) & -alignment;
bfd_set_section_vma (sect, m_last_size);
m_last_size += bfd_section_size (sect);
m_last_size = (m_last_size + alignment - 1) & -alignment;
}
/* Helper for link_callbacks callbacks vector. */
static void
link_callbacks_multiple_definition (struct bfd_link_info *link_info,
struct bfd_link_hash_entry *h, bfd *nbfd,
asection *nsec, bfd_vma nval)
{
bfd *abfd = link_info->input_bfds;
if (link_info->allow_multiple_definition)
return;
warning (_("Compiled module \"%s\": multiple symbol definitions: %s"),
bfd_get_filename (abfd), h->root.string);
}
/* Helper for link_callbacks callbacks vector. */
static void
link_callbacks_warning (struct bfd_link_info *link_info, const char *xwarning,
const char *symbol, bfd *abfd, asection *section,
bfd_vma address)
{
warning (_("Compiled module \"%s\" section \"%s\": warning: %s"),
bfd_get_filename (abfd), bfd_section_name (section),
xwarning);
}
/* Helper for link_callbacks callbacks vector. */
static void
link_callbacks_undefined_symbol (struct bfd_link_info *link_info,
const char *name, bfd *abfd, asection *section,
bfd_vma address, bfd_boolean is_fatal)
{
warning (_("Cannot resolve relocation to \"%s\" "
"from compiled module \"%s\" section \"%s\"."),
name, bfd_get_filename (abfd), bfd_section_name (section));
}
/* Helper for link_callbacks callbacks vector. */
static void
link_callbacks_reloc_overflow (struct bfd_link_info *link_info,
struct bfd_link_hash_entry *entry,
const char *name, const char *reloc_name,
bfd_vma addend, bfd *abfd, asection *section,
bfd_vma address)
{
}
/* Helper for link_callbacks callbacks vector. */
static void
link_callbacks_reloc_dangerous (struct bfd_link_info *link_info,
const char *message, bfd *abfd,
asection *section, bfd_vma address)
{
warning (_("Compiled module \"%s\" section \"%s\": dangerous "
"relocation: %s\n"),
bfd_get_filename (abfd), bfd_section_name (section),
message);
}
/* Helper for link_callbacks callbacks vector. */
static void
link_callbacks_unattached_reloc (struct bfd_link_info *link_info,
const char *name, bfd *abfd, asection *section,
bfd_vma address)
{
warning (_("Compiled module \"%s\" section \"%s\": unattached "
"relocation: %s\n"),
bfd_get_filename (abfd), bfd_section_name (section),
name);
}
/* Helper for link_callbacks callbacks vector. */
static void link_callbacks_einfo (const char *fmt, ...)
ATTRIBUTE_PRINTF (1, 2);
static void
link_callbacks_einfo (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
std::string str = string_vprintf (fmt, ap);
va_end (ap);
warning (_("Compile module: warning: %s"), str.c_str ());
}
/* Helper for bfd_get_relocated_section_contents.
Only these symbols are set by bfd_simple_get_relocated_section_contents
but bfd/ seems to use even the NULL ones without checking them first. */
static const struct bfd_link_callbacks link_callbacks =
{
NULL, /* add_archive_element */
link_callbacks_multiple_definition, /* multiple_definition */
NULL, /* multiple_common */
NULL, /* add_to_set */
NULL, /* constructor */
link_callbacks_warning, /* warning */
link_callbacks_undefined_symbol, /* undefined_symbol */
link_callbacks_reloc_overflow, /* reloc_overflow */
link_callbacks_reloc_dangerous, /* reloc_dangerous */
link_callbacks_unattached_reloc, /* unattached_reloc */
NULL, /* notice */
link_callbacks_einfo, /* einfo */
NULL, /* info */
NULL, /* minfo */
NULL, /* override_segment_assignment */
};
struct link_hash_table_cleanup_data
{
explicit link_hash_table_cleanup_data (bfd *abfd_)
: abfd (abfd_),
link_next (abfd->link.next)
{
}
~link_hash_table_cleanup_data ()
{
if (abfd->is_linker_output)
(*abfd->link.hash->hash_table_free) (abfd);
abfd->link.next = link_next;
}
DISABLE_COPY_AND_ASSIGN (link_hash_table_cleanup_data);
private:
bfd *abfd;
bfd *link_next;
};
/* Relocate and store into inferior memory each section SECT of ABFD. */
static void
copy_sections (bfd *abfd, asection *sect, void *data)
{
asymbol **symbol_table = (asymbol **) data;
bfd_byte *sect_data_got;
struct bfd_link_info link_info;
struct bfd_link_order link_order;
CORE_ADDR inferior_addr;
if ((bfd_section_flags (sect) & (SEC_ALLOC | SEC_LOAD))
!= (SEC_ALLOC | SEC_LOAD))
return;
if (bfd_section_size (sect) == 0)
return;
/* Mostly a copy of bfd_simple_get_relocated_section_contents which GDB
cannot use as it does not report relocations to undefined symbols. */
memset (&link_info, 0, sizeof (link_info));
link_info.output_bfd = abfd;
link_info.input_bfds = abfd;
link_info.input_bfds_tail = &abfd->link.next;
struct link_hash_table_cleanup_data cleanup_data (abfd);
abfd->link.next = NULL;
link_info.hash = bfd_link_hash_table_create (abfd);
link_info.callbacks = &link_callbacks;
memset (&link_order, 0, sizeof (link_order));
link_order.next = NULL;
link_order.type = bfd_indirect_link_order;
link_order.offset = 0;
link_order.size = bfd_section_size (sect);
link_order.u.indirect.section = sect;
gdb::unique_xmalloc_ptr<gdb_byte> sect_data
((bfd_byte *) xmalloc (bfd_section_size (sect)));
sect_data_got = bfd_get_relocated_section_contents (abfd, &link_info,
&link_order,
sect_data.get (),
FALSE, symbol_table);
if (sect_data_got == NULL)
error (_("Cannot map compiled module \"%s\" section \"%s\": %s"),
bfd_get_filename (abfd), bfd_section_name (sect),
bfd_errmsg (bfd_get_error ()));
gdb_assert (sect_data_got == sect_data.get ());
inferior_addr = bfd_section_vma (sect);
if (0 != target_write_memory (inferior_addr, sect_data.get (),
bfd_section_size (sect)))
error (_("Cannot write compiled module \"%s\" section \"%s\" "
"to inferior memory range %s-%s."),
bfd_get_filename (abfd), bfd_section_name (sect),
paddress (target_gdbarch (), inferior_addr),
paddress (target_gdbarch (),
inferior_addr + bfd_section_size (sect)));
}
/* Fetch the type of COMPILE_I_EXPR_PTR_TYPE and COMPILE_I_EXPR_VAL
symbols in OBJFILE so we can calculate how much memory to allocate
for the out parameter. This avoids needing a malloc in the generated
code. Throw an error if anything fails.
GDB first tries to compile the code with COMPILE_I_PRINT_ADDRESS_SCOPE.
If it finds user tries to print an array type this function returns
NULL. Caller will then regenerate the code with
COMPILE_I_PRINT_VALUE_SCOPE, recompiles it again and finally runs it.
This is because __auto_type array-to-pointer type conversion of
COMPILE_I_EXPR_VAL which gets detected by COMPILE_I_EXPR_PTR_TYPE
preserving the array type. */
static struct type *
get_out_value_type (struct symbol *func_sym, struct objfile *objfile,
enum compile_i_scope_types scope)
{
struct symbol *gdb_ptr_type_sym;
/* Initialize it just to avoid a GCC false warning. */
struct symbol *gdb_val_sym = NULL;
struct type *gdb_ptr_type, *gdb_type_from_ptr, *gdb_type, *retval;
/* Initialize it just to avoid a GCC false warning. */
const struct block *block = NULL;
const struct blockvector *bv;
int nblocks = 0;
int block_loop = 0;
lookup_name_info func_matcher (GCC_FE_WRAPPER_FUNCTION,
symbol_name_match_type::SEARCH_NAME);
bv = SYMTAB_BLOCKVECTOR (func_sym->owner.symtab);
nblocks = BLOCKVECTOR_NBLOCKS (bv);
gdb_ptr_type_sym = NULL;
for (block_loop = 0; block_loop < nblocks; block_loop++)
{
struct symbol *function = NULL;
const struct block *function_block;
block = BLOCKVECTOR_BLOCK (bv, block_loop);
if (BLOCK_FUNCTION (block) != NULL)
continue;
gdb_val_sym = block_lookup_symbol (block,
COMPILE_I_EXPR_VAL,
symbol_name_match_type::SEARCH_NAME,
VAR_DOMAIN);
if (gdb_val_sym == NULL)
continue;
function_block = block;
while (function_block != BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)
&& function_block != BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
{
function_block = BLOCK_SUPERBLOCK (function_block);
function = BLOCK_FUNCTION (function_block);
if (function != NULL)
break;
}
if (function != NULL
&& (BLOCK_SUPERBLOCK (function_block)
== BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK))
&& symbol_matches_search_name (function, func_matcher))
break;
}
if (block_loop == nblocks)
error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_VAL);
gdb_type = SYMBOL_TYPE (gdb_val_sym);
gdb_type = check_typedef (gdb_type);
gdb_ptr_type_sym = block_lookup_symbol (block, COMPILE_I_EXPR_PTR_TYPE,
symbol_name_match_type::SEARCH_NAME,
VAR_DOMAIN);
if (gdb_ptr_type_sym == NULL)
error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE);
gdb_ptr_type = SYMBOL_TYPE (gdb_ptr_type_sym);
gdb_ptr_type = check_typedef (gdb_ptr_type);
if (gdb_ptr_type->code () != TYPE_CODE_PTR)
error (_("Type of \"%s\" is not a pointer"), COMPILE_I_EXPR_PTR_TYPE);
gdb_type_from_ptr = check_typedef (TYPE_TARGET_TYPE (gdb_ptr_type));
if (types_deeply_equal (gdb_type, gdb_type_from_ptr))
{
if (scope != COMPILE_I_PRINT_ADDRESS_SCOPE)
error (_("Expected address scope in compiled module \"%s\"."),
objfile_name (objfile));
return gdb_type;
}
if (gdb_type->code () != TYPE_CODE_PTR)
error (_("Invalid type code %d of symbol \"%s\" "
"in compiled module \"%s\"."),
gdb_type_from_ptr->code (), COMPILE_I_EXPR_VAL,
objfile_name (objfile));
retval = gdb_type_from_ptr;
switch (gdb_type_from_ptr->code ())
{
case TYPE_CODE_ARRAY:
gdb_type_from_ptr = TYPE_TARGET_TYPE (gdb_type_from_ptr);
break;
case TYPE_CODE_FUNC:
break;
default:
error (_("Invalid type code %d of symbol \"%s\" "
"in compiled module \"%s\"."),
gdb_type_from_ptr->code (), COMPILE_I_EXPR_PTR_TYPE,
objfile_name (objfile));
}
if (!types_deeply_equal (gdb_type_from_ptr,
TYPE_TARGET_TYPE (gdb_type)))
error (_("Referenced types do not match for symbols \"%s\" and \"%s\" "
"in compiled module \"%s\"."),
COMPILE_I_EXPR_PTR_TYPE, COMPILE_I_EXPR_VAL,
objfile_name (objfile));
if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE)
return NULL;
return retval;
}
/* Fetch the type of first parameter of FUNC_SYM.
Return NULL if FUNC_SYM has no parameters. Throw an error otherwise. */
static struct type *
get_regs_type (struct symbol *func_sym, struct objfile *objfile)
{
struct type *func_type = SYMBOL_TYPE (func_sym);
struct type *regsp_type, *regs_type;
/* No register parameter present. */
if (func_type->num_fields () == 0)
return NULL;
regsp_type = check_typedef (func_type->field (0).type ());
if (regsp_type->code () != TYPE_CODE_PTR)
error (_("Invalid type code %d of first parameter of function \"%s\" "
"in compiled module \"%s\"."),
regsp_type->code (), GCC_FE_WRAPPER_FUNCTION,
objfile_name (objfile));
regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type));
if (regs_type->code () != TYPE_CODE_STRUCT)
error (_("Invalid type code %d of dereferenced first parameter "
"of function \"%s\" in compiled module \"%s\"."),
regs_type->code (), GCC_FE_WRAPPER_FUNCTION,
objfile_name (objfile));
return regs_type;
}
/* Store all inferior registers required by REGS_TYPE to inferior memory
starting at inferior address REGS_BASE. */
static void
store_regs (struct type *regs_type, CORE_ADDR regs_base)
{
struct gdbarch *gdbarch = target_gdbarch ();
int fieldno;
for (fieldno = 0; fieldno < regs_type->num_fields (); fieldno++)
{
const char *reg_name = regs_type->field (fieldno).name ();
ULONGEST reg_bitpos = TYPE_FIELD_BITPOS (regs_type, fieldno);
ULONGEST reg_bitsize = TYPE_FIELD_BITSIZE (regs_type, fieldno);
ULONGEST reg_offset;
struct type *reg_type
= check_typedef (regs_type->field (fieldno).type ());
ULONGEST reg_size = TYPE_LENGTH (reg_type);
int regnum;
struct value *regval;
CORE_ADDR inferior_addr;
if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0)
continue;
if ((reg_bitpos % 8) != 0 || reg_bitsize != 0)
error (_("Invalid register \"%s\" position %s bits or size %s bits"),
reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize));
reg_offset = reg_bitpos / 8;
if (reg_type->code () != TYPE_CODE_INT
&& reg_type->code () != TYPE_CODE_PTR)
error (_("Invalid register \"%s\" type code %d"), reg_name,
reg_type->code ());
regnum = compile_register_name_demangle (gdbarch, reg_name);
regval = value_from_register (reg_type, regnum, get_current_frame ());
if (value_optimized_out (regval))
error (_("Register \"%s\" is optimized out."), reg_name);
if (!value_entirely_available (regval))
error (_("Register \"%s\" is not available."), reg_name);
inferior_addr = regs_base + reg_offset;
if (0 != target_write_memory (inferior_addr,
value_contents (regval).data (),
reg_size))
error (_("Cannot write register \"%s\" to inferior memory at %s."),
reg_name, paddress (gdbarch, inferior_addr));
}
}
/* Load the object file specified in FILE_NAMES into inferior memory.
Throw an error otherwise. Caller must fully dispose the return
value by calling compile_object_run. Returns NULL only for
COMPILE_I_PRINT_ADDRESS_SCOPE when COMPILE_I_PRINT_VALUE_SCOPE
should have been used instead. */
compile_module_up
compile_object_load (const compile_file_names &file_names,
enum compile_i_scope_types scope, void *scope_data)
{
CORE_ADDR regs_addr, out_value_addr = 0;
struct symbol *func_sym;
struct type *func_type;
struct bound_minimal_symbol bmsym;
long storage_needed;
asymbol **symbol_table, **symp;
long number_of_symbols, missing_symbols;
struct type *regs_type, *out_value_type = NULL;
char **matching;
struct objfile *objfile;
int expect_parameters;
struct type *expect_return_type;
gdb::unique_xmalloc_ptr<char> filename
(tilde_expand (file_names.object_file ()));
gdb_bfd_ref_ptr abfd (gdb_bfd_open (filename.get (), gnutarget));
if (abfd == NULL)
error (_("\"%s\": could not open as compiled module: %s"),
filename.get (), bfd_errmsg (bfd_get_error ()));
if (!bfd_check_format_matches (abfd.get (), bfd_object, &matching))
error (_("\"%s\": not in loadable format: %s"),
filename.get (),
gdb_bfd_errmsg (bfd_get_error (), matching).c_str ());
if ((bfd_get_file_flags (abfd.get ()) & (EXEC_P | DYNAMIC)) != 0)
error (_("\"%s\": not in object format."), filename.get ());
struct setup_sections_data setup_sections_data (abfd.get ());
for (asection *sect = abfd->sections; sect != nullptr; sect = sect->next)
setup_sections_data.setup_one_section (sect);
setup_sections_data.setup_one_section (nullptr);
storage_needed = bfd_get_symtab_upper_bound (abfd.get ());
if (storage_needed < 0)
error (_("Cannot read symbols of compiled module \"%s\": %s"),
filename.get (), bfd_errmsg (bfd_get_error ()));
/* SYMFILE_VERBOSE is not passed even if FROM_TTY, user is not interested in
"Reading symbols from ..." message for automatically generated file. */
objfile_up objfile_holder (symbol_file_add_from_bfd (abfd.get (),
filename.get (),
0, NULL, 0, NULL));
objfile = objfile_holder.get ();
func_sym = lookup_global_symbol_from_objfile (objfile,
GLOBAL_BLOCK,
GCC_FE_WRAPPER_FUNCTION,
VAR_DOMAIN).symbol;
if (func_sym == NULL)
error (_("Cannot find function \"%s\" in compiled module \"%s\"."),
GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
func_type = SYMBOL_TYPE (func_sym);
if (func_type->code () != TYPE_CODE_FUNC)
error (_("Invalid type code %d of function \"%s\" in compiled "
"module \"%s\"."),
func_type->code (), GCC_FE_WRAPPER_FUNCTION,
objfile_name (objfile));
switch (scope)
{
case COMPILE_I_SIMPLE_SCOPE:
expect_parameters = 1;
expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
break;
case COMPILE_I_RAW_SCOPE:
expect_parameters = 0;
expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
break;
case COMPILE_I_PRINT_ADDRESS_SCOPE:
case COMPILE_I_PRINT_VALUE_SCOPE:
expect_parameters = 2;
expect_return_type = builtin_type (target_gdbarch ())->builtin_void;
break;
default:
internal_error (__FILE__, __LINE__, _("invalid scope %d"), scope);
}
if (func_type->num_fields () != expect_parameters)
error (_("Invalid %d parameters of function \"%s\" in compiled "
"module \"%s\"."),
func_type->num_fields (), GCC_FE_WRAPPER_FUNCTION,
objfile_name (objfile));
if (!types_deeply_equal (expect_return_type, TYPE_TARGET_TYPE (func_type)))
error (_("Invalid return type of function \"%s\" in compiled "
"module \"%s\"."),
GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
/* The memory may be later needed
by bfd_generic_get_relocated_section_contents
called from default_symfile_relocate. */
symbol_table = (asymbol **) obstack_alloc (&objfile->objfile_obstack,
storage_needed);
number_of_symbols = bfd_canonicalize_symtab (abfd.get (), symbol_table);
if (number_of_symbols < 0)
error (_("Cannot parse symbols of compiled module \"%s\": %s"),
filename.get (), bfd_errmsg (bfd_get_error ()));
missing_symbols = 0;
for (symp = symbol_table; symp < symbol_table + number_of_symbols; symp++)
{
asymbol *sym = *symp;
if (sym->flags != 0)
continue;
sym->flags = BSF_GLOBAL;
sym->section = bfd_abs_section_ptr;
if (strcmp (sym->name, "_GLOBAL_OFFSET_TABLE_") == 0)
{
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"ELF symbol \"%s\" relocated to zero\n",
sym->name);
/* It seems to be a GCC bug, with -mcmodel=large there should be no
need for _GLOBAL_OFFSET_TABLE_. Together with -fPIE the data
remain PC-relative even with _GLOBAL_OFFSET_TABLE_ as zero. */
sym->value = 0;
continue;
}
if (strcmp (sym->name, ".TOC.") == 0)
{
/* Handle the .TOC. symbol as the linker would do. Set the .TOC.
sections value to 0x8000 (see bfd/elf64-ppc.c TOC_BASE_OFF);
point the symbol section at the ".toc" section;
and pass the toc->vma value into bfd_set_gp_value().
If the .toc section is not found, use the first section
with the SEC_ALLOC flag set. In the unlikely case that
we still do not have a section identified, fall back to using
the "*ABS*" section. */
asection *toc_fallback = bfd_get_section_by_name(abfd.get(), ".toc");
if (toc_fallback == NULL)
{
for (asection *tsect = abfd->sections; tsect != nullptr;
tsect = tsect->next)
{
if (bfd_section_flags (tsect) & SEC_ALLOC)
{
toc_fallback = tsect;
break;
}
}
}
if (toc_fallback == NULL)
/* If we've gotten here, we have not found a section usable
as a backup for the .toc section. In this case, use the
absolute (*ABS*) section. */
toc_fallback = bfd_abs_section_ptr;
sym->section = toc_fallback;
sym->value = 0x8000;
bfd_set_gp_value(abfd.get(), toc_fallback->vma);
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"Connectiong ELF symbol \"%s\" to the .toc section (%s)\n",
sym->name,
paddress (target_gdbarch (), sym->value));
continue;
}
bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
switch (bmsym.minsym == NULL
? mst_unknown : MSYMBOL_TYPE (bmsym.minsym))
{
case mst_text:
case mst_bss:
case mst_data:
sym->value = BMSYMBOL_VALUE_ADDRESS (bmsym);
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"ELF mst_text symbol \"%s\" relocated to %s\n",
sym->name,
paddress (target_gdbarch (), sym->value));
break;
case mst_text_gnu_ifunc:
sym->value = gnu_ifunc_resolve_addr (target_gdbarch (),
BMSYMBOL_VALUE_ADDRESS (bmsym));
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"ELF mst_text_gnu_ifunc symbol \"%s\" "
"relocated to %s\n",
sym->name,
paddress (target_gdbarch (), sym->value));
break;
default:
warning (_("Could not find symbol \"%s\" "
"for compiled module \"%s\"."),
sym->name, filename.get ());
missing_symbols++;
}
}
if (missing_symbols)
error (_("%ld symbols were missing, cannot continue."), missing_symbols);
bfd_map_over_sections (abfd.get (), copy_sections, symbol_table);
regs_type = get_regs_type (func_sym, objfile);
if (regs_type == NULL)
regs_addr = 0;
else
{
/* Use read-only non-executable memory protection. */
regs_addr = gdbarch_infcall_mmap (target_gdbarch (),
TYPE_LENGTH (regs_type),
GDB_MMAP_PROT_READ);
gdb_assert (regs_addr != 0);
setup_sections_data.munmap_list.add (regs_addr, TYPE_LENGTH (regs_type));
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"allocated %s bytes at %s for registers\n",
paddress (target_gdbarch (),
TYPE_LENGTH (regs_type)),
paddress (target_gdbarch (), regs_addr));
store_regs (regs_type, regs_addr);
}
if (scope == COMPILE_I_PRINT_ADDRESS_SCOPE
|| scope == COMPILE_I_PRINT_VALUE_SCOPE)
{
out_value_type = get_out_value_type (func_sym, objfile, scope);
if (out_value_type == NULL)
return NULL;
check_typedef (out_value_type);
out_value_addr = gdbarch_infcall_mmap (target_gdbarch (),
TYPE_LENGTH (out_value_type),
(GDB_MMAP_PROT_READ
| GDB_MMAP_PROT_WRITE));
gdb_assert (out_value_addr != 0);
setup_sections_data.munmap_list.add (out_value_addr,
TYPE_LENGTH (out_value_type));
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"allocated %s bytes at %s for printed value\n",
paddress (target_gdbarch (),
TYPE_LENGTH (out_value_type)),
paddress (target_gdbarch (), out_value_addr));
}
compile_module_up retval (new struct compile_module);
retval->objfile = objfile_holder.release ();
retval->source_file = file_names.source_file ();
retval->func_sym = func_sym;
retval->regs_addr = regs_addr;
retval->scope = scope;
retval->scope_data = scope_data;
retval->out_value_type = out_value_type;
retval->out_value_addr = out_value_addr;
retval->munmap_list = std::move (setup_sections_data.munmap_list);
return retval;
}
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