aboutsummaryrefslogtreecommitdiff
path: root/gdb/compile/compile-object-load.c
diff options
context:
space:
mode:
Diffstat (limited to 'gdb/compile/compile-object-load.c')
-rw-r--r--gdb/compile/compile-object-load.c588
1 files changed, 588 insertions, 0 deletions
diff --git a/gdb/compile/compile-object-load.c b/gdb/compile/compile-object-load.c
new file mode 100644
index 0000000..eedc9fa
--- /dev/null
+++ b/gdb/compile/compile-object-load.c
@@ -0,0 +1,588 @@
+/* Load module for 'compile' command.
+
+ Copyright (C) 2014 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 "compile.h"
+#include "arch-utils.h"
+
+/* Helper data for setup_sections. */
+
+struct setup_sections_data
+{
+ /* Size of all recent sections with matching LAST_PROT. */
+ CORE_ADDR last_size;
+
+ /* First section matching LAST_PROT. */
+ asection *last_section_first;
+
+ /* Memory protection like the prot parameter of gdbarch_infcall_mmap. */
+ unsigned last_prot;
+
+ /* 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 last_max_alignment;
+};
+
+/* Place all ABFD sections next to each other obeying all constraints. */
+
+static void
+setup_sections (bfd *abfd, asection *sect, void *data_voidp)
+{
+ struct setup_sections_data *data = data_voidp;
+ 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_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
+ return;
+
+ // Make the memory always readable.
+ prot = GDB_MMAP_PROT_READ;
+ if ((bfd_get_section_flags (abfd, sect) & SEC_READONLY) == 0)
+ prot |= GDB_MMAP_PROT_WRITE;
+ if ((bfd_get_section_flags (abfd, sect) & SEC_CODE) != 0)
+ prot |= GDB_MMAP_PROT_EXEC;
+
+ if (compile_debug)
+ fprintf_unfiltered (gdb_stdout,
+ "module \"%s\" section \"%s\" size %s prot %u\n",
+ bfd_get_filename (abfd),
+ bfd_get_section_name (abfd, sect),
+ paddress (target_gdbarch (),
+ bfd_get_section_size (sect)),
+ prot);
+ }
+ else
+ prot = -1;
+
+ if (sect == NULL
+ || (data->last_prot != prot && bfd_get_section_size (sect) != 0))
+ {
+ CORE_ADDR addr;
+ asection *sect_iter;
+
+ if (data->last_size != 0)
+ {
+ addr = gdbarch_infcall_mmap (target_gdbarch (), data->last_size,
+ data->last_prot);
+ if (compile_debug)
+ fprintf_unfiltered (gdb_stdout,
+ "allocated %s bytes at %s prot %u\n",
+ paddress (target_gdbarch (), data->last_size),
+ paddress (target_gdbarch (), addr),
+ data->last_prot);
+ }
+ else
+ addr = 0;
+
+ if ((addr & (data->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 (), data->last_max_alignment));
+
+ for (sect_iter = data->last_section_first; sect_iter != sect;
+ sect_iter = sect_iter->next)
+ if ((bfd_get_section_flags (abfd, sect_iter) & SEC_ALLOC) != 0)
+ bfd_set_section_vma (abfd, sect_iter,
+ addr + bfd_get_section_vma (abfd, sect_iter));
+
+ data->last_size = 0;
+ data->last_section_first = sect;
+ data->last_prot = prot;
+ data->last_max_alignment = 1;
+ }
+
+ if (sect == NULL)
+ return;
+
+ alignment = ((CORE_ADDR) 1) << bfd_get_section_alignment (abfd, sect);
+ data->last_max_alignment = max (data->last_max_alignment, alignment);
+
+ data->last_size = (data->last_size + alignment - 1) & -alignment;
+
+ bfd_set_section_vma (abfd, sect, data->last_size);
+
+ data->last_size += bfd_get_section_size (sect);
+ data->last_size = (data->last_size + alignment - 1) & -alignment;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static bfd_boolean
+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 TRUE;
+ warning (_("Compiled module \"%s\": multiple symbol definitions: %s\n"),
+ bfd_get_filename (abfd), h->root.string);
+ return FALSE;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static bfd_boolean
+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\n"),
+ bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
+ xwarning);
+ /* Maybe permit running as a module? */
+ return FALSE;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static bfd_boolean
+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_get_section_name (abfd, section));
+ return FALSE;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static bfd_boolean
+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)
+{
+ /* TRUE is required for intra-module relocations. */
+ return TRUE;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static bfd_boolean
+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_get_section_name (abfd, section),
+ message);
+ return FALSE;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static bfd_boolean
+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_get_section_name (abfd, section),
+ name);
+ return FALSE;
+}
+
+/* Helper for link_callbacks callbacks vector. */
+
+static void
+link_callbacks_einfo (const char *fmt, ...)
+{
+ struct cleanup *cleanups;
+ va_list ap;
+ char *str;
+
+ va_start (ap, fmt);
+ str = xstrvprintf (fmt, ap);
+ va_end (ap);
+ cleanups = make_cleanup (xfree, str);
+
+ warning (_("Compile module: warning: %s\n"), str);
+
+ do_cleanups (cleanups);
+}
+
+/* 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
+{
+ bfd *abfd;
+ bfd *link_next;
+};
+
+/* Cleanup callback for struct bfd_link_info. */
+
+static void
+link_hash_table_free (void *d)
+{
+ struct link_hash_table_cleanup_data *data = d;
+
+ if (data->abfd->is_linker_output)
+ (*data->abfd->link.hash->hash_table_free) (data->abfd);
+ data->abfd->link.next = data->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 = data;
+ bfd_byte *sect_data, *sect_data_got;
+ struct cleanup *cleanups;
+ struct bfd_link_info link_info;
+ struct bfd_link_order link_order;
+ CORE_ADDR inferior_addr;
+ struct link_hash_table_cleanup_data cleanup_data;
+
+ if ((bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD))
+ != (SEC_ALLOC | SEC_LOAD))
+ return;
+
+ if (bfd_get_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;
+
+ cleanup_data.abfd = abfd;
+ cleanup_data.link_next = abfd->link.next;
+
+ abfd->link.next = NULL;
+ link_info.hash = bfd_link_hash_table_create (abfd);
+
+ cleanups = make_cleanup (link_hash_table_free, &cleanup_data);
+ 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_get_section_size (sect);
+ link_order.u.indirect.section = sect;
+
+ sect_data = xmalloc (bfd_get_section_size (sect));
+ make_cleanup (xfree, sect_data);
+
+ sect_data_got = bfd_get_relocated_section_contents (abfd, &link_info,
+ &link_order, sect_data,
+ FALSE, symbol_table);
+
+ if (sect_data_got == NULL)
+ error (_("Cannot map compiled module \"%s\" section \"%s\": %s"),
+ bfd_get_filename (abfd), bfd_get_section_name (abfd, sect),
+ bfd_errmsg (bfd_get_error ()));
+ gdb_assert (sect_data_got == sect_data);
+
+ inferior_addr = bfd_get_section_vma (abfd, sect);
+ if (0 != target_write_memory (inferior_addr, sect_data,
+ bfd_get_section_size (sect)))
+ error (_("Cannot write compiled module \"%s\" section \"%s\" "
+ "to inferior memory range %s-%s."),
+ bfd_get_filename (abfd), bfd_get_section_name (abfd, sect),
+ paddress (target_gdbarch (), inferior_addr),
+ paddress (target_gdbarch (),
+ inferior_addr + bfd_get_section_size (sect)));
+
+ do_cleanups (cleanups);
+}
+
+/* Fetch the type of first parameter of GCC_FE_WRAPPER_FUNCTION.
+ Return NULL if GCC_FE_WRAPPER_FUNCTION has no parameters.
+ Throw an error otherwise. */
+
+static struct type *
+get_regs_type (struct objfile *objfile)
+{
+ struct symbol *func_sym;
+ struct type *func_type, *regsp_type, *regs_type;
+
+ func_sym = lookup_global_symbol_from_objfile (objfile,
+ GCC_FE_WRAPPER_FUNCTION,
+ VAR_DOMAIN);
+ 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 (TYPE_CODE (func_type) != TYPE_CODE_FUNC)
+ error (_("Invalid type code %d of function \"%s\" in compiled "
+ "module \"%s\"."),
+ TYPE_CODE (func_type), GCC_FE_WRAPPER_FUNCTION,
+ objfile_name (objfile));
+
+ /* No register parameter present. */
+ if (TYPE_NFIELDS (func_type) == 0)
+ return NULL;
+
+ if (TYPE_NFIELDS (func_type) != 1)
+ error (_("Invalid %d parameters of function \"%s\" in compiled "
+ "module \"%s\"."),
+ TYPE_NFIELDS (func_type), GCC_FE_WRAPPER_FUNCTION,
+ objfile_name (objfile));
+
+ regsp_type = check_typedef (TYPE_FIELD_TYPE (func_type, 0));
+ if (TYPE_CODE (regsp_type) != TYPE_CODE_PTR)
+ error (_("Invalid type code %d of first parameter of function \"%s\" "
+ "in compiled module \"%s\"."),
+ TYPE_CODE (regsp_type), GCC_FE_WRAPPER_FUNCTION,
+ objfile_name (objfile));
+
+ regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type));
+ if (TYPE_CODE (regs_type) != TYPE_CODE_STRUCT)
+ error (_("Invalid type code %d of dereferenced first parameter "
+ "of function \"%s\" in compiled module \"%s\"."),
+ TYPE_CODE (regs_type), 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 ();
+ struct regcache *regcache = get_thread_regcache (inferior_ptid);
+ int fieldno;
+
+ for (fieldno = 0; fieldno < TYPE_NFIELDS (regs_type); fieldno++)
+ {
+ const char *reg_name = TYPE_FIELD_NAME (regs_type, fieldno);
+ 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 (TYPE_FIELD_TYPE (regs_type,
+ fieldno));
+ 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 (TYPE_CODE (reg_type) != TYPE_CODE_INT
+ && TYPE_CODE (reg_type) != TYPE_CODE_PTR)
+ error (_("Invalid register \"%s\" type code %d"), reg_name,
+ TYPE_CODE (reg_type));
+
+ 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),
+ reg_size))
+ error (_("Cannot write register \"%s\" to inferior memory at %s."),
+ reg_name, paddress (gdbarch, inferior_addr));
+ }
+}
+
+/* Load OBJECT_FILE into inferior memory. Throw an error otherwise.
+ Caller must fully dispose the return value by calling compile_object_run.
+ SOURCE_FILE's copy is stored into the returned object.
+ Caller should free both OBJECT_FILE and SOURCE_FILE immediatelly after this
+ function returns. */
+
+struct compile_module *
+compile_object_load (const char *object_file, const char *source_file)
+{
+ struct cleanup *cleanups, *cleanups_free_objfile;
+ bfd *abfd;
+ struct setup_sections_data setup_sections_data;
+ CORE_ADDR addr, func_addr, regs_addr;
+ struct bound_minimal_symbol bmsym;
+ long storage_needed;
+ asymbol **symbol_table, **symp;
+ long number_of_symbols, missing_symbols;
+ struct type *dptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
+ unsigned dptr_type_len = TYPE_LENGTH (dptr_type);
+ struct compile_module *retval;
+ struct type *regs_type;
+ char *filename, **matching;
+ struct objfile *objfile;
+
+ filename = tilde_expand (object_file);
+ cleanups = make_cleanup (xfree, filename);
+
+ abfd = gdb_bfd_open (filename, gnutarget, -1);
+ if (abfd == NULL)
+ error (_("\"%s\": could not open as compiled module: %s"),
+ filename, bfd_errmsg (bfd_get_error ()));
+ make_cleanup_bfd_unref (abfd);
+
+ if (!bfd_check_format_matches (abfd, bfd_object, &matching))
+ error (_("\"%s\": not in loadable format: %s"),
+ filename, gdb_bfd_errmsg (bfd_get_error (), matching));
+
+ if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) != 0)
+ error (_("\"%s\": not in object format."), filename);
+
+ setup_sections_data.last_size = 0;
+ setup_sections_data.last_section_first = abfd->sections;
+ setup_sections_data.last_prot = -1;
+ setup_sections_data.last_max_alignment = 1;
+ bfd_map_over_sections (abfd, setup_sections, &setup_sections_data);
+ setup_sections (abfd, NULL, &setup_sections_data);
+
+ storage_needed = bfd_get_symtab_upper_bound (abfd);
+ if (storage_needed < 0)
+ error (_("Cannot read symbols of compiled module \"%s\": %s"),
+ filename, 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 = symbol_file_add_from_bfd (abfd, filename, 0, NULL, 0, NULL);
+ cleanups_free_objfile = make_cleanup_free_objfile (objfile);
+
+ bmsym = lookup_minimal_symbol_text (GCC_FE_WRAPPER_FUNCTION, objfile);
+ if (bmsym.minsym == NULL || MSYMBOL_TYPE (bmsym.minsym) == mst_file_text)
+ error (_("Could not find symbol \"%s\" of compiled module \"%s\"."),
+ GCC_FE_WRAPPER_FUNCTION, filename);
+ func_addr = BMSYMBOL_VALUE_ADDRESS (bmsym);
+
+ /* The memory may be later needed
+ by bfd_generic_get_relocated_section_contents
+ called from default_symfile_relocate. */
+ symbol_table = obstack_alloc (&objfile->objfile_obstack, storage_needed);
+ number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+ if (number_of_symbols < 0)
+ error (_("Cannot parse symbols of compiled module \"%s\": %s"),
+ filename, 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;
+ if (compile_debug)
+ fprintf_unfiltered (gdb_stdout,
+ "lookup undefined ELF symbol \"%s\"\n",
+ sym->name);
+ sym->flags = BSF_GLOBAL;
+ sym->section = bfd_abs_section_ptr;
+ if (strcmp (sym->name, "_GLOBAL_OFFSET_TABLE_") == 0)
+ {
+ sym->value = 0;
+ continue;
+ }
+ bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
+ switch (bmsym.minsym == NULL
+ ? mst_unknown : MSYMBOL_TYPE (bmsym.minsym))
+ {
+ case mst_text:
+ sym->value = BMSYMBOL_VALUE_ADDRESS (bmsym);
+ break;
+ default:
+ warning (_("Could not find symbol \"%s\" "
+ "for compiled module \"%s\"."),
+ sym->name, filename);
+ missing_symbols++;
+ }
+ }
+ if (missing_symbols)
+ error (_("%ld symbols were missing, cannot continue."), missing_symbols);
+
+ bfd_map_over_sections (abfd, copy_sections, symbol_table);
+
+ regs_type = get_regs_type (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);
+ store_regs (regs_type, regs_addr);
+ }
+
+ discard_cleanups (cleanups_free_objfile);
+ do_cleanups (cleanups);
+
+ retval = xmalloc (sizeof (*retval));
+ retval->objfile = objfile;
+ retval->source_file = xstrdup (source_file);
+ retval->func_addr = func_addr;
+ retval->regs_addr = regs_addr;
+ return retval;
+}
generated by cgit v1.1 at 2025-05-01 14:05:34 +0000