/* Generate a core file for the inferior process.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "inferior.h"
#include "gdbcore.h"
#include "objfiles.h"
+#include "solib.h"
#include "symfile.h"
-
+#include "arch-utils.h"
+#include "completer.h"
+#include "gcore.h"
#include "cli/cli-decode.h"
-
-#include "gdb_assert.h"
+#include <fcntl.h>
+#include "regcache.h"
+#include "regset.h"
+#include "gdb_bfd.h"
+#include "readline/tilde.h"
+#include <algorithm>
+#include "gdbsupport/gdb_unlinker.h"
+#include "gdbsupport/byte-vector.h"
+#include "gdbsupport/scope-exit.h"
/* The largest amount of memory to read from the target at once. We
must throttle it to limit the amount of memory used by GDB during
static unsigned long default_gcore_mach (void);
static int gcore_memory_sections (bfd *);
-/* Generate a core file from the inferior process. */
+/* create_gcore_bfd -- helper for gcore_command (exported).
+ Open a new bfd core file for output, and return the handle. */
+
+gdb_bfd_ref_ptr
+create_gcore_bfd (const char *filename)
+{
+ gdb_bfd_ref_ptr obfd (gdb_bfd_openw (filename, default_gcore_target ()));
+
+ if (obfd == NULL)
+ error (_("Failed to open '%s' for output."), filename);
+ bfd_set_format (obfd.get (), bfd_core);
+ bfd_set_arch_mach (obfd.get (), default_gcore_arch (), default_gcore_mach ());
+ return obfd;
+}
+
+/* write_gcore_file_1 -- do the actual work of write_gcore_file. */
static void
-gcore_command (char *args, int from_tty)
+write_gcore_file_1 (bfd *obfd)
{
- struct cleanup *old_chain;
- char *corefilename, corefilename_buffer[40];
- asection *note_sec = NULL;
- bfd *obfd;
- void *note_data = NULL;
+ gdb::unique_xmalloc_ptr<char> note_data;
int note_size = 0;
+ asection *note_sec = NULL;
+
+ /* An external target method must build the notes section. */
+ /* FIXME: uweigand/2011-10-06: All architectures that support core file
+ generation should be converted to gdbarch_make_corefile_notes; at that
+ point, the target vector method can be removed. */
+ if (!gdbarch_make_corefile_notes_p (target_gdbarch ()))
+ note_data.reset (target_make_corefile_notes (obfd, ¬e_size));
+ else
+ note_data.reset (gdbarch_make_corefile_notes (target_gdbarch (), obfd,
+ ¬e_size));
+
+ if (note_data == NULL || note_size == 0)
+ error (_("Target does not support core file generation."));
+
+ /* Create the note section. */
+ note_sec = bfd_make_section_anyway_with_flags (obfd, "note0",
+ SEC_HAS_CONTENTS
+ | SEC_READONLY
+ | SEC_ALLOC);
+ if (note_sec == NULL)
+ error (_("Failed to create 'note' section for corefile: %s"),
+ bfd_errmsg (bfd_get_error ()));
+
+ bfd_set_section_vma (note_sec, 0);
+ bfd_set_section_alignment (note_sec, 0);
+ bfd_set_section_size (note_sec, note_size);
+
+ /* Now create the memory/load sections. */
+ if (gcore_memory_sections (obfd) == 0)
+ error (_("gcore: failed to get corefile memory sections from target."));
+
+ /* Write out the contents of the note section. */
+ if (!bfd_set_section_contents (obfd, note_sec, note_data.get (), 0,
+ note_size))
+ warning (_("writing note section (%s)"), bfd_errmsg (bfd_get_error ()));
+}
+
+/* write_gcore_file -- helper for gcore_command (exported).
+ Compose and write the corefile data to the core file. */
+
+void
+write_gcore_file (bfd *obfd)
+{
+ target_prepare_to_generate_core ();
+ SCOPE_EXIT { target_done_generating_core (); };
+ write_gcore_file_1 (obfd);
+}
+
+/* gcore_command -- implements the 'gcore' command.
+ Generate a core file from the inferior process. */
+
+static void
+gcore_command (const char *args, int from_tty)
+{
+ gdb::unique_xmalloc_ptr<char> corefilename;
/* No use generating a corefile without a target process. */
if (!target_has_execution)
noprocess ();
if (args && *args)
- corefilename = args;
+ corefilename.reset (tilde_expand (args));
else
{
/* Default corefile name is "core.PID". */
- sprintf (corefilename_buffer, "core.%d", PIDGET (inferior_ptid));
- corefilename = corefilename_buffer;
+ corefilename.reset (xstrprintf ("core.%d", inferior_ptid.pid ()));
}
if (info_verbose)
fprintf_filtered (gdb_stdout,
- "Opening corefile '%s' for output.\n", corefilename);
+ "Opening corefile '%s' for output.\n",
+ corefilename.get ());
/* Open the output file. */
- obfd = bfd_openw (corefilename, default_gcore_target ());
- if (!obfd)
- error (_("Failed to open '%s' for output."), corefilename);
-
- /* Need a cleanup that will close the file (FIXME: delete it?). */
- old_chain = make_cleanup_bfd_close (obfd);
-
- bfd_set_format (obfd, bfd_core);
- bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ());
+ gdb_bfd_ref_ptr obfd (create_gcore_bfd (corefilename.get ()));
- /* An external target method must build the notes section. */
- note_data = target_make_corefile_notes (obfd, ¬e_size);
-
- /* Create the note section. */
- if (note_data != NULL && note_size != 0)
- {
- note_sec = bfd_make_section_anyway_with_flags (obfd, "note0",
- SEC_HAS_CONTENTS
- | SEC_READONLY
- | SEC_ALLOC);
- if (note_sec == NULL)
- error (_("Failed to create 'note' section for corefile: %s"),
- bfd_errmsg (bfd_get_error ()));
+ /* Arrange to unlink the file on failure. */
+ gdb::unlinker unlink_file (corefilename.get ());
- bfd_set_section_vma (obfd, note_sec, 0);
- bfd_set_section_alignment (obfd, note_sec, 0);
- bfd_set_section_size (obfd, note_sec, note_size);
- }
-
- /* Now create the memory/load sections. */
- if (gcore_memory_sections (obfd) == 0)
- error (_("gcore: failed to get corefile memory sections from target."));
-
- /* Write out the contents of the note section. */
- if (note_data != NULL && note_size != 0)
- {
- if (!bfd_set_section_contents (obfd, note_sec, note_data, 0, note_size))
- warning (_("writing note section (%s)"), bfd_errmsg (bfd_get_error ()));
- }
+ /* Call worker function. */
+ write_gcore_file (obfd.get ());
/* Succeeded. */
- fprintf_filtered (gdb_stdout, "Saved corefile %s\n", corefilename);
+ unlink_file.keep ();
- /* Clean-ups will close the output file and free malloc memory. */
- do_cleanups (old_chain);
- return;
+ fprintf_filtered (gdb_stdout, "Saved corefile %s\n", corefilename.get ());
}
static unsigned long
return 0;
#else
- const struct bfd_arch_info *bfdarch = gdbarch_bfd_arch_info (target_gdbarch);
+ const struct bfd_arch_info *bfdarch = gdbarch_bfd_arch_info (target_gdbarch ());
if (bfdarch != NULL)
return bfdarch->mach;
static enum bfd_architecture
default_gcore_arch (void)
{
- const struct bfd_arch_info *bfdarch = gdbarch_bfd_arch_info (target_gdbarch);
+ const struct bfd_arch_info *bfdarch = gdbarch_bfd_arch_info (target_gdbarch ());
if (bfdarch != NULL)
return bfdarch->arch;
default_gcore_target (void)
{
/* The gdbarch may define a target to use for core files. */
- if (gdbarch_gcore_bfd_target_p (target_gdbarch))
- return gdbarch_gcore_bfd_target (target_gdbarch);
+ if (gdbarch_gcore_bfd_target_p (target_gdbarch ()))
+ return gdbarch_gcore_bfd_target (target_gdbarch ());
/* Otherwise, try to fall back to the exec_bfd target. This will probably
not work for non-ELF targets. */
return 1;
}
+/* call_target_sbrk --
+ helper function for derive_heap_segment. */
+
+static bfd_vma
+call_target_sbrk (int sbrk_arg)
+{
+ struct objfile *sbrk_objf;
+ struct gdbarch *gdbarch;
+ bfd_vma top_of_heap;
+ struct value *target_sbrk_arg;
+ struct value *sbrk_fn, *ret;
+ bfd_vma tmp;
+
+ if (lookup_minimal_symbol ("sbrk", NULL, NULL).minsym != NULL)
+ {
+ sbrk_fn = find_function_in_inferior ("sbrk", &sbrk_objf);
+ if (sbrk_fn == NULL)
+ return (bfd_vma) 0;
+ }
+ else if (lookup_minimal_symbol ("_sbrk", NULL, NULL).minsym != NULL)
+ {
+ sbrk_fn = find_function_in_inferior ("_sbrk", &sbrk_objf);
+ if (sbrk_fn == NULL)
+ return (bfd_vma) 0;
+ }
+ else
+ return (bfd_vma) 0;
+
+ gdbarch = sbrk_objf->arch ();
+ target_sbrk_arg = value_from_longest (builtin_type (gdbarch)->builtin_int,
+ sbrk_arg);
+ gdb_assert (target_sbrk_arg);
+ ret = call_function_by_hand (sbrk_fn, NULL, target_sbrk_arg);
+ if (ret == NULL)
+ return (bfd_vma) 0;
+
+ tmp = value_as_long (ret);
+ if ((LONGEST) tmp <= 0 || (LONGEST) tmp == 0xffffffff)
+ return (bfd_vma) 0;
+
+ top_of_heap = tmp;
+ return top_of_heap;
+}
+
/* Derive a reasonable heap segment for ABFD by looking at sbrk and
the static data sections. Store its limits in *BOTTOM and *TOP.
Return non-zero if successful. */
static int
derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top)
{
- struct objfile *sbrk_objf;
- struct gdbarch *gdbarch;
bfd_vma top_of_data_memory = 0;
bfd_vma top_of_heap = 0;
bfd_size_type sec_size;
- struct value *zero, *sbrk;
bfd_vma sec_vaddr;
asection *sec;
for (sec = abfd->sections; sec; sec = sec->next)
{
- if (bfd_get_section_flags (abfd, sec) & SEC_DATA
- || strcmp (".bss", bfd_section_name (abfd, sec)) == 0)
+ if (bfd_section_flags (sec) & SEC_DATA
+ || strcmp (".bss", bfd_section_name (sec)) == 0)
{
- sec_vaddr = bfd_get_section_vma (abfd, sec);
- sec_size = bfd_get_section_size (sec);
+ sec_vaddr = bfd_section_vma (sec);
+ sec_size = bfd_section_size (sec);
if (sec_vaddr + sec_size > top_of_data_memory)
top_of_data_memory = sec_vaddr + sec_size;
}
}
- /* Now get the top-of-heap by calling sbrk in the inferior. */
- if (lookup_minimal_symbol ("sbrk", NULL, NULL) != NULL)
- {
- sbrk = find_function_in_inferior ("sbrk", &sbrk_objf);
- if (sbrk == NULL)
- return 0;
- }
- else if (lookup_minimal_symbol ("_sbrk", NULL, NULL) != NULL)
- {
- sbrk = find_function_in_inferior ("_sbrk", &sbrk_objf);
- if (sbrk == NULL)
- return 0;
- }
- else
+ top_of_heap = call_target_sbrk (0);
+ if (top_of_heap == (bfd_vma) 0)
return 0;
- gdbarch = get_objfile_arch (sbrk_objf);
- zero = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
- gdb_assert (zero);
- sbrk = call_function_by_hand (sbrk, 1, &zero);
- if (sbrk == NULL)
- return 0;
- top_of_heap = value_as_long (sbrk);
-
/* Return results. */
if (top_of_heap > top_of_data_memory)
{
make_output_phdrs (bfd *obfd, asection *osec, void *ignored)
{
int p_flags = 0;
- int p_type;
+ int p_type = 0;
/* FIXME: these constants may only be applicable for ELF. */
- if (strncmp (bfd_section_name (obfd, osec), "load", 4) == 0)
+ if (startswith (bfd_section_name (osec), "load"))
p_type = PT_LOAD;
- else
+ else if (startswith (bfd_section_name (osec), "note"))
p_type = PT_NOTE;
+ else
+ p_type = PT_NULL;
p_flags |= PF_R; /* Segment is readable. */
- if (!(bfd_get_section_flags (obfd, osec) & SEC_READONLY))
+ if (!(bfd_section_flags (osec) & SEC_READONLY))
p_flags |= PF_W; /* Segment is writable. */
- if (bfd_get_section_flags (obfd, osec) & SEC_CODE)
+ if (bfd_section_flags (osec) & SEC_CODE)
p_flags |= PF_X; /* Segment is executable. */
bfd_record_phdr (obfd, p_type, 1, p_flags, 0, 0, 0, 0, 1, &osec);
}
+/* find_memory_region_ftype implementation. DATA is 'bfd *' for the core file
+ GDB is creating. */
+
static int
-gcore_create_callback (CORE_ADDR vaddr, unsigned long size,
- int read, int write, int exec, void *data)
+gcore_create_callback (CORE_ADDR vaddr, unsigned long size, int read,
+ int write, int exec, int modified, void *data)
{
- bfd *obfd = data;
+ bfd *obfd = (bfd *) data;
asection *osec;
flagword flags = SEC_ALLOC | SEC_HAS_CONTENTS | SEC_LOAD;
/* If the memory segment has no permissions set, ignore it, otherwise
when we later try to access it for read/write, we'll get an error
or jam the kernel. */
- if (read == 0 && write == 0 && exec == 0)
+ if (read == 0 && write == 0 && exec == 0 && modified == 0)
{
if (info_verbose)
{
- fprintf_filtered (gdb_stdout, "Ignore segment, %s bytes at 0x%s\n",
- plongest (size), paddr_nz (vaddr));
+ fprintf_filtered (gdb_stdout, "Ignore segment, %s bytes at %s\n",
+ plongest (size), paddress (target_gdbarch (), vaddr));
}
return 0;
}
- if (write == 0)
+ if (write == 0 && modified == 0 && !solib_keep_data_in_core (vaddr, size))
{
/* See if this region of memory lies inside a known file on disk.
If so, we can avoid copying its contents by clearing SEC_LOAD. */
- struct objfile *objfile;
struct obj_section *objsec;
- ALL_OBJSECTIONS (objfile, objsec)
- {
- bfd *abfd = objfile->obfd;
- asection *asec = objsec->the_bfd_section;
- bfd_vma align = (bfd_vma) 1 << bfd_get_section_alignment (abfd,
- asec);
- bfd_vma start = obj_section_addr (objsec) & -align;
- bfd_vma end = (obj_section_endaddr (objsec) + align - 1) & -align;
- /* Match if either the entire memory region lies inside the
- section (i.e. a mapping covering some pages of a large
- segment) or the entire section lies inside the memory region
- (i.e. a mapping covering multiple small sections).
-
- This BFD was synthesized from reading target memory,
- we don't want to omit that. */
- if (((vaddr >= start && vaddr + size <= end)
- || (start >= vaddr && end <= vaddr + size))
- && !(bfd_get_file_flags (abfd) & BFD_IN_MEMORY))
- {
- flags &= ~SEC_LOAD;
- flags |= SEC_NEVER_LOAD;
- goto keep; /* break out of two nested for loops */
- }
- }
-
- keep:
- flags |= SEC_READONLY;
+ for (objfile *objfile : current_program_space->objfiles ())
+ ALL_OBJFILE_OSECTIONS (objfile, objsec)
+ {
+ bfd *abfd = objfile->obfd;
+ asection *asec = objsec->the_bfd_section;
+ bfd_vma align = (bfd_vma) 1 << bfd_section_alignment (asec);
+ bfd_vma start = obj_section_addr (objsec) & -align;
+ bfd_vma end = (obj_section_endaddr (objsec) + align - 1) & -align;
+
+ /* Match if either the entire memory region lies inside the
+ section (i.e. a mapping covering some pages of a large
+ segment) or the entire section lies inside the memory region
+ (i.e. a mapping covering multiple small sections).
+
+ This BFD was synthesized from reading target memory,
+ we don't want to omit that. */
+ if (objfile->separate_debug_objfile_backlink == NULL
+ && ((vaddr >= start && vaddr + size <= end)
+ || (start >= vaddr && end <= vaddr + size))
+ && !(bfd_get_file_flags (abfd) & BFD_IN_MEMORY))
+ {
+ flags &= ~(SEC_LOAD | SEC_HAS_CONTENTS);
+ goto keep; /* Break out of two nested for loops. */
+ }
+ }
+
+ keep:;
}
+ if (write == 0)
+ flags |= SEC_READONLY;
+
if (exec)
flags |= SEC_CODE;
else
if (info_verbose)
{
- fprintf_filtered (gdb_stdout, "Save segment, %s bytes at 0x%s\n",
- plongest (size), paddr_nz (vaddr));
+ fprintf_filtered (gdb_stdout, "Save segment, %s bytes at %s\n",
+ plongest (size), paddress (target_gdbarch (), vaddr));
}
- bfd_set_section_size (obfd, osec, size);
- bfd_set_section_vma (obfd, osec, vaddr);
- bfd_section_lma (obfd, osec) = 0; /* ??? bfd_set_section_lma? */
+ bfd_set_section_size (osec, size);
+ bfd_set_section_vma (osec, vaddr);
+ bfd_set_section_lma (osec, 0);
return 0;
}
-static int
-objfile_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
- int, int, int, void *),
- void *obfd)
+int
+objfile_find_memory_regions (struct target_ops *self,
+ find_memory_region_ftype func, void *obfd)
{
/* Use objfile data to create memory sections. */
- struct objfile *objfile;
struct obj_section *objsec;
bfd_vma temp_bottom, temp_top;
/* Call callback function for each objfile section. */
- ALL_OBJSECTIONS (objfile, objsec)
- {
- bfd *ibfd = objfile->obfd;
- asection *isec = objsec->the_bfd_section;
- flagword flags = bfd_get_section_flags (ibfd, isec);
- int ret;
-
- if ((flags & SEC_ALLOC) || (flags & SEC_LOAD))
- {
- int size = bfd_section_size (ibfd, isec);
- int ret;
-
- ret = (*func) (obj_section_addr (objsec), bfd_section_size (ibfd, isec),
- 1, /* All sections will be readable. */
- (flags & SEC_READONLY) == 0, /* Writable. */
- (flags & SEC_CODE) != 0, /* Executable. */
- obfd);
- if (ret != 0)
- return ret;
- }
- }
+ for (objfile *objfile : current_program_space->objfiles ())
+ ALL_OBJFILE_OSECTIONS (objfile, objsec)
+ {
+ asection *isec = objsec->the_bfd_section;
+ flagword flags = bfd_section_flags (isec);
+
+ /* Separate debug info files are irrelevant for gcore. */
+ if (objfile->separate_debug_objfile_backlink != NULL)
+ continue;
+
+ if ((flags & SEC_ALLOC) || (flags & SEC_LOAD))
+ {
+ int size = bfd_section_size (isec);
+ int ret;
+
+ ret = (*func) (obj_section_addr (objsec), size,
+ 1, /* All sections will be readable. */
+ (flags & SEC_READONLY) == 0, /* Writable. */
+ (flags & SEC_CODE) != 0, /* Executable. */
+ 1, /* MODIFIED is unknown, pass it as true. */
+ obfd);
+ if (ret != 0)
+ return ret;
+ }
+ }
/* Make a stack segment. */
if (derive_stack_segment (&temp_bottom, &temp_top))
1, /* Stack section will be readable. */
1, /* Stack section will be writable. */
0, /* Stack section will not be executable. */
+ 1, /* Stack section will be modified. */
obfd);
- /* Make a heap segment. */
+ /* Make a heap segment. */
if (derive_heap_segment (exec_bfd, &temp_bottom, &temp_top))
(*func) (temp_bottom, temp_top - temp_bottom,
1, /* Heap section will be readable. */
1, /* Heap section will be writable. */
0, /* Heap section will not be executable. */
+ 1, /* Heap section will be modified. */
obfd);
return 0;
static void
gcore_copy_callback (bfd *obfd, asection *osec, void *ignored)
{
- bfd_size_type size, total_size = bfd_section_size (obfd, osec);
+ bfd_size_type size, total_size = bfd_section_size (osec);
file_ptr offset = 0;
- struct cleanup *old_chain = NULL;
- void *memhunk;
/* Read-only sections are marked; we don't have to copy their contents. */
- if ((bfd_get_section_flags (obfd, osec) & SEC_LOAD) == 0)
+ if ((bfd_section_flags (osec) & SEC_LOAD) == 0)
return;
/* Only interested in "load" sections. */
- if (strncmp ("load", bfd_section_name (obfd, osec), 4) != 0)
+ if (!startswith (bfd_section_name (osec), "load"))
return;
- size = min (total_size, MAX_COPY_BYTES);
- memhunk = xmalloc (size);
- /* ??? This is crap since xmalloc should never return NULL. */
- if (memhunk == NULL)
- error (_("Not enough memory to create corefile."));
- old_chain = make_cleanup (xfree, memhunk);
+ size = std::min (total_size, (bfd_size_type) MAX_COPY_BYTES);
+ gdb::byte_vector memhunk (size);
while (total_size > 0)
{
if (size > total_size)
size = total_size;
- if (target_read_memory (bfd_section_vma (obfd, osec) + offset,
- memhunk, size) != 0)
+ if (target_read_memory (bfd_section_vma (osec) + offset,
+ memhunk.data (), size) != 0)
{
- warning (_("Memory read failed for corefile section, %s bytes at 0x%s."),
- plongest (size), paddr (bfd_section_vma (obfd, osec)));
+ warning (_("Memory read failed for corefile "
+ "section, %s bytes at %s."),
+ plongest (size),
+ paddress (target_gdbarch (), bfd_section_vma (osec)));
break;
}
- if (!bfd_set_section_contents (obfd, osec, memhunk, offset, size))
+ if (!bfd_set_section_contents (obfd, osec, memhunk.data (),
+ offset, size))
{
warning (_("Failed to write corefile contents (%s)."),
bfd_errmsg (bfd_get_error ()));
total_size -= size;
offset += size;
}
-
- do_cleanups (old_chain); /* Frees MEMHUNK. */
}
static int
gcore_memory_sections (bfd *obfd)
{
- if (target_find_memory_regions (gcore_create_callback, obfd) != 0)
- return 0; /* FIXME: error return/msg? */
+ /* Try gdbarch method first, then fall back to target method. */
+ if (!gdbarch_find_memory_regions_p (target_gdbarch ())
+ || gdbarch_find_memory_regions (target_gdbarch (),
+ gcore_create_callback, obfd) != 0)
+ {
+ if (target_find_memory_regions (gcore_create_callback, obfd) != 0)
+ return 0; /* FIXME: error return/msg? */
+ }
/* Record phdrs for section-to-segment mapping. */
bfd_map_over_sections (obfd, make_output_phdrs, NULL);
return 1;
}
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern initialize_file_ftype _initialize_gcore;
-
+void _initialize_gcore ();
void
-_initialize_gcore (void)
+_initialize_gcore ()
{
add_com ("generate-core-file", class_files, gcore_command, _("\
Save a core file with the current state of the debugged process.\n\
-Argument is optional filename. Default filename is 'core.<process_id>'."));
+Usage: generate-core-file [FILENAME]\n\
+Argument is optional filename. Default filename is 'core.PROCESS_ID'."));
add_com_alias ("gcore", "generate-core-file", class_files, 1);
- exec_set_find_memory_regions (objfile_find_memory_regions);
}
projects / deliverable / binutils-gdb.git / blobdiff