596 lines
19 KiB
C
596 lines
19 KiB
C
/* Load module for 'compile' command.
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Copyright (C) 2014-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "compile-object-load.h"
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#include "compile-internal.h"
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#include "command.h"
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#include "objfiles.h"
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#include "gdbcore.h"
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#include "readline/tilde.h"
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#include "bfdlink.h"
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#include "gdbcmd.h"
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#include "regcache.h"
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#include "inferior.h"
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#include "compile.h"
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#include "arch-utils.h"
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/* Helper data for setup_sections. */
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struct setup_sections_data
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{
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/* Size of all recent sections with matching LAST_PROT. */
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CORE_ADDR last_size;
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/* First section matching LAST_PROT. */
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asection *last_section_first;
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/* Memory protection like the prot parameter of gdbarch_infcall_mmap. */
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unsigned last_prot;
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/* Maximum of alignments of all sections matching LAST_PROT.
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This value is always at least 1. This value is always a power of 2. */
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CORE_ADDR last_max_alignment;
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};
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/* Place all ABFD sections next to each other obeying all constraints. */
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static void
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setup_sections (bfd *abfd, asection *sect, void *data_voidp)
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{
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struct setup_sections_data *data = data_voidp;
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CORE_ADDR alignment;
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unsigned prot;
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if (sect != NULL)
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{
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/* It is required by later bfd_get_relocated_section_contents. */
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if (sect->output_section == NULL)
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sect->output_section = sect;
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if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
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return;
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/* Make the memory always readable. */
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prot = GDB_MMAP_PROT_READ;
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if ((bfd_get_section_flags (abfd, sect) & SEC_READONLY) == 0)
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prot |= GDB_MMAP_PROT_WRITE;
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if ((bfd_get_section_flags (abfd, sect) & SEC_CODE) != 0)
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prot |= GDB_MMAP_PROT_EXEC;
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if (compile_debug)
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fprintf_unfiltered (gdb_stdout,
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"module \"%s\" section \"%s\" size %s prot %u\n",
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bfd_get_filename (abfd),
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bfd_get_section_name (abfd, sect),
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paddress (target_gdbarch (),
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bfd_get_section_size (sect)),
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prot);
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}
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else
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prot = -1;
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if (sect == NULL
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|| (data->last_prot != prot && bfd_get_section_size (sect) != 0))
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{
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CORE_ADDR addr;
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asection *sect_iter;
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if (data->last_size != 0)
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{
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addr = gdbarch_infcall_mmap (target_gdbarch (), data->last_size,
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data->last_prot);
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if (compile_debug)
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fprintf_unfiltered (gdb_stdout,
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"allocated %s bytes at %s prot %u\n",
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paddress (target_gdbarch (), data->last_size),
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paddress (target_gdbarch (), addr),
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data->last_prot);
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}
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else
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addr = 0;
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if ((addr & (data->last_max_alignment - 1)) != 0)
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error (_("Inferior compiled module address %s "
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"is not aligned to BFD required %s."),
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paddress (target_gdbarch (), addr),
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paddress (target_gdbarch (), data->last_max_alignment));
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for (sect_iter = data->last_section_first; sect_iter != sect;
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sect_iter = sect_iter->next)
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if ((bfd_get_section_flags (abfd, sect_iter) & SEC_ALLOC) != 0)
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bfd_set_section_vma (abfd, sect_iter,
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addr + bfd_get_section_vma (abfd, sect_iter));
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data->last_size = 0;
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data->last_section_first = sect;
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data->last_prot = prot;
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data->last_max_alignment = 1;
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}
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if (sect == NULL)
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return;
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alignment = ((CORE_ADDR) 1) << bfd_get_section_alignment (abfd, sect);
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data->last_max_alignment = max (data->last_max_alignment, alignment);
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data->last_size = (data->last_size + alignment - 1) & -alignment;
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bfd_set_section_vma (abfd, sect, data->last_size);
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data->last_size += bfd_get_section_size (sect);
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data->last_size = (data->last_size + alignment - 1) & -alignment;
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}
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/* Helper for link_callbacks callbacks vector. */
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static bfd_boolean
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link_callbacks_multiple_definition (struct bfd_link_info *link_info,
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struct bfd_link_hash_entry *h, bfd *nbfd,
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asection *nsec, bfd_vma nval)
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{
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bfd *abfd = link_info->input_bfds;
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if (link_info->allow_multiple_definition)
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return TRUE;
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warning (_("Compiled module \"%s\": multiple symbol definitions: %s"),
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bfd_get_filename (abfd), h->root.string);
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return FALSE;
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}
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/* Helper for link_callbacks callbacks vector. */
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static bfd_boolean
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link_callbacks_warning (struct bfd_link_info *link_info, const char *xwarning,
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const char *symbol, bfd *abfd, asection *section,
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bfd_vma address)
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{
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warning (_("Compiled module \"%s\" section \"%s\": warning: %s"),
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bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
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xwarning);
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/* Maybe permit running as a module? */
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return FALSE;
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}
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/* Helper for link_callbacks callbacks vector. */
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static bfd_boolean
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link_callbacks_undefined_symbol (struct bfd_link_info *link_info,
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const char *name, bfd *abfd, asection *section,
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bfd_vma address, bfd_boolean is_fatal)
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{
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warning (_("Cannot resolve relocation to \"%s\" "
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"from compiled module \"%s\" section \"%s\"."),
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name, bfd_get_filename (abfd), bfd_get_section_name (abfd, section));
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return FALSE;
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}
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/* Helper for link_callbacks callbacks vector. */
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static bfd_boolean
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link_callbacks_reloc_overflow (struct bfd_link_info *link_info,
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struct bfd_link_hash_entry *entry,
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const char *name, const char *reloc_name,
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bfd_vma addend, bfd *abfd, asection *section,
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bfd_vma address)
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{
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/* TRUE is required for intra-module relocations. */
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return TRUE;
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}
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/* Helper for link_callbacks callbacks vector. */
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static bfd_boolean
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link_callbacks_reloc_dangerous (struct bfd_link_info *link_info,
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const char *message, bfd *abfd,
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asection *section, bfd_vma address)
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{
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warning (_("Compiled module \"%s\" section \"%s\": dangerous "
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"relocation: %s\n"),
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bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
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message);
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return FALSE;
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}
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/* Helper for link_callbacks callbacks vector. */
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static bfd_boolean
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link_callbacks_unattached_reloc (struct bfd_link_info *link_info,
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const char *name, bfd *abfd, asection *section,
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bfd_vma address)
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{
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warning (_("Compiled module \"%s\" section \"%s\": unattached "
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"relocation: %s\n"),
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bfd_get_filename (abfd), bfd_get_section_name (abfd, section),
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name);
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return FALSE;
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}
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/* Helper for link_callbacks callbacks vector. */
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static void link_callbacks_einfo (const char *fmt, ...)
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ATTRIBUTE_PRINTF (1, 2);
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static void
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link_callbacks_einfo (const char *fmt, ...)
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{
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struct cleanup *cleanups;
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va_list ap;
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char *str;
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va_start (ap, fmt);
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str = xstrvprintf (fmt, ap);
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va_end (ap);
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cleanups = make_cleanup (xfree, str);
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warning (_("Compile module: warning: %s"), str);
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do_cleanups (cleanups);
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}
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/* Helper for bfd_get_relocated_section_contents.
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Only these symbols are set by bfd_simple_get_relocated_section_contents
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but bfd/ seems to use even the NULL ones without checking them first. */
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static const struct bfd_link_callbacks link_callbacks =
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{
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NULL, /* add_archive_element */
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link_callbacks_multiple_definition, /* multiple_definition */
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NULL, /* multiple_common */
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NULL, /* add_to_set */
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NULL, /* constructor */
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link_callbacks_warning, /* warning */
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link_callbacks_undefined_symbol, /* undefined_symbol */
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link_callbacks_reloc_overflow, /* reloc_overflow */
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link_callbacks_reloc_dangerous, /* reloc_dangerous */
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link_callbacks_unattached_reloc, /* unattached_reloc */
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NULL, /* notice */
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link_callbacks_einfo, /* einfo */
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NULL, /* info */
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NULL, /* minfo */
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NULL, /* override_segment_assignment */
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};
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struct link_hash_table_cleanup_data
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{
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bfd *abfd;
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bfd *link_next;
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};
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/* Cleanup callback for struct bfd_link_info. */
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static void
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link_hash_table_free (void *d)
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{
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struct link_hash_table_cleanup_data *data = d;
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if (data->abfd->is_linker_output)
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(*data->abfd->link.hash->hash_table_free) (data->abfd);
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data->abfd->link.next = data->link_next;
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}
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/* Relocate and store into inferior memory each section SECT of ABFD. */
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static void
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copy_sections (bfd *abfd, asection *sect, void *data)
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{
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asymbol **symbol_table = data;
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bfd_byte *sect_data, *sect_data_got;
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struct cleanup *cleanups;
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struct bfd_link_info link_info;
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struct bfd_link_order link_order;
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CORE_ADDR inferior_addr;
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struct link_hash_table_cleanup_data cleanup_data;
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if ((bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD))
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!= (SEC_ALLOC | SEC_LOAD))
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return;
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if (bfd_get_section_size (sect) == 0)
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return;
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/* Mostly a copy of bfd_simple_get_relocated_section_contents which GDB
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cannot use as it does not report relocations to undefined symbols. */
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memset (&link_info, 0, sizeof (link_info));
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link_info.output_bfd = abfd;
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link_info.input_bfds = abfd;
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link_info.input_bfds_tail = &abfd->link.next;
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cleanup_data.abfd = abfd;
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cleanup_data.link_next = abfd->link.next;
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abfd->link.next = NULL;
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link_info.hash = bfd_link_hash_table_create (abfd);
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cleanups = make_cleanup (link_hash_table_free, &cleanup_data);
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link_info.callbacks = &link_callbacks;
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memset (&link_order, 0, sizeof (link_order));
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link_order.next = NULL;
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link_order.type = bfd_indirect_link_order;
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link_order.offset = 0;
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link_order.size = bfd_get_section_size (sect);
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link_order.u.indirect.section = sect;
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sect_data = xmalloc (bfd_get_section_size (sect));
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make_cleanup (xfree, sect_data);
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sect_data_got = bfd_get_relocated_section_contents (abfd, &link_info,
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&link_order, sect_data,
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FALSE, symbol_table);
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if (sect_data_got == NULL)
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error (_("Cannot map compiled module \"%s\" section \"%s\": %s"),
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bfd_get_filename (abfd), bfd_get_section_name (abfd, sect),
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bfd_errmsg (bfd_get_error ()));
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gdb_assert (sect_data_got == sect_data);
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inferior_addr = bfd_get_section_vma (abfd, sect);
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if (0 != target_write_memory (inferior_addr, sect_data,
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bfd_get_section_size (sect)))
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error (_("Cannot write compiled module \"%s\" section \"%s\" "
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"to inferior memory range %s-%s."),
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bfd_get_filename (abfd), bfd_get_section_name (abfd, sect),
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paddress (target_gdbarch (), inferior_addr),
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paddress (target_gdbarch (),
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inferior_addr + bfd_get_section_size (sect)));
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do_cleanups (cleanups);
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}
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/* Fetch the type of first parameter of GCC_FE_WRAPPER_FUNCTION.
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Return NULL if GCC_FE_WRAPPER_FUNCTION has no parameters.
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Throw an error otherwise. */
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static struct type *
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get_regs_type (struct objfile *objfile)
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{
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struct symbol *func_sym;
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struct type *func_type, *regsp_type, *regs_type;
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func_sym = lookup_global_symbol_from_objfile (objfile,
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GCC_FE_WRAPPER_FUNCTION,
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VAR_DOMAIN);
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if (func_sym == NULL)
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error (_("Cannot find function \"%s\" in compiled module \"%s\"."),
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GCC_FE_WRAPPER_FUNCTION, objfile_name (objfile));
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func_type = SYMBOL_TYPE (func_sym);
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if (TYPE_CODE (func_type) != TYPE_CODE_FUNC)
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error (_("Invalid type code %d of function \"%s\" in compiled "
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"module \"%s\"."),
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TYPE_CODE (func_type), GCC_FE_WRAPPER_FUNCTION,
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objfile_name (objfile));
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/* No register parameter present. */
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if (TYPE_NFIELDS (func_type) == 0)
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return NULL;
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if (TYPE_NFIELDS (func_type) != 1)
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error (_("Invalid %d parameters of function \"%s\" in compiled "
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"module \"%s\"."),
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TYPE_NFIELDS (func_type), GCC_FE_WRAPPER_FUNCTION,
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objfile_name (objfile));
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regsp_type = check_typedef (TYPE_FIELD_TYPE (func_type, 0));
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if (TYPE_CODE (regsp_type) != TYPE_CODE_PTR)
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error (_("Invalid type code %d of first parameter of function \"%s\" "
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"in compiled module \"%s\"."),
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TYPE_CODE (regsp_type), GCC_FE_WRAPPER_FUNCTION,
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objfile_name (objfile));
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regs_type = check_typedef (TYPE_TARGET_TYPE (regsp_type));
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if (TYPE_CODE (regs_type) != TYPE_CODE_STRUCT)
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error (_("Invalid type code %d of dereferenced first parameter "
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"of function \"%s\" in compiled module \"%s\"."),
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TYPE_CODE (regs_type), GCC_FE_WRAPPER_FUNCTION,
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objfile_name (objfile));
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return regs_type;
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}
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/* Store all inferior registers required by REGS_TYPE to inferior memory
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starting at inferior address REGS_BASE. */
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static void
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store_regs (struct type *regs_type, CORE_ADDR regs_base)
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{
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struct gdbarch *gdbarch = target_gdbarch ();
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struct regcache *regcache = get_thread_regcache (inferior_ptid);
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int fieldno;
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for (fieldno = 0; fieldno < TYPE_NFIELDS (regs_type); fieldno++)
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{
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const char *reg_name = TYPE_FIELD_NAME (regs_type, fieldno);
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ULONGEST reg_bitpos = TYPE_FIELD_BITPOS (regs_type, fieldno);
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ULONGEST reg_bitsize = TYPE_FIELD_BITSIZE (regs_type, fieldno);
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ULONGEST reg_offset;
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struct type *reg_type = check_typedef (TYPE_FIELD_TYPE (regs_type,
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fieldno));
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ULONGEST reg_size = TYPE_LENGTH (reg_type);
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int regnum;
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struct value *regval;
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CORE_ADDR inferior_addr;
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if (strcmp (reg_name, COMPILE_I_SIMPLE_REGISTER_DUMMY) == 0)
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continue;
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if ((reg_bitpos % 8) != 0 || reg_bitsize != 0)
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error (_("Invalid register \"%s\" position %s bits or size %s bits"),
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reg_name, pulongest (reg_bitpos), pulongest (reg_bitsize));
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reg_offset = reg_bitpos / 8;
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if (TYPE_CODE (reg_type) != TYPE_CODE_INT
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&& TYPE_CODE (reg_type) != TYPE_CODE_PTR)
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error (_("Invalid register \"%s\" type code %d"), reg_name,
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TYPE_CODE (reg_type));
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regnum = compile_register_name_demangle (gdbarch, reg_name);
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regval = value_from_register (reg_type, regnum, get_current_frame ());
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if (value_optimized_out (regval))
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error (_("Register \"%s\" is optimized out."), reg_name);
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if (!value_entirely_available (regval))
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error (_("Register \"%s\" is not available."), reg_name);
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inferior_addr = regs_base + reg_offset;
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if (0 != target_write_memory (inferior_addr, value_contents (regval),
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reg_size))
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error (_("Cannot write register \"%s\" to inferior memory at %s."),
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reg_name, paddress (gdbarch, inferior_addr));
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}
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}
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/* Load OBJECT_FILE into inferior memory. Throw an error otherwise.
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Caller must fully dispose the return value by calling compile_object_run.
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SOURCE_FILE's copy is stored into the returned object.
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Caller should free both OBJECT_FILE and SOURCE_FILE immediatelly after this
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function returns. */
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struct compile_module *
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compile_object_load (const char *object_file, const char *source_file)
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{
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struct cleanup *cleanups, *cleanups_free_objfile;
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bfd *abfd;
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struct setup_sections_data setup_sections_data;
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CORE_ADDR addr, func_addr, regs_addr;
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struct bound_minimal_symbol bmsym;
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long storage_needed;
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asymbol **symbol_table, **symp;
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long number_of_symbols, missing_symbols;
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struct type *dptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
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unsigned dptr_type_len = TYPE_LENGTH (dptr_type);
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struct compile_module *retval;
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struct type *regs_type;
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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;
|
|
case mst_text_gnu_ifunc:
|
|
sym->value = gnu_ifunc_resolve_addr (target_gdbarch (),
|
|
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;
|
|
}
|