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Add new command line switch --thumb-entry.

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This commit is contained in:
Nick Clifton 1999-06-21 03:30:32 +00:00
parent 74479bd3b9
commit 6f798e5c17
5 changed files with 173 additions and 3 deletions
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7
ld/ChangeLog
View file

@ -1,3 +1,10 @@
1999-06-18 Nick Clifton <nickc@cygnus.com>
* emultempl/pe.em: Add new command line switch --thumb-entry.
* emultempl/armelf.em: Add new command line switch --thumb-entry.
* emultempl/armcoff.em: Add new command line switch --thumb-entry.
* ld.texinfo: Document new ARM command line switch: --thumb-entry.
1999-06-20 H.J. Lu <hjl@gnu.org>
* configure.in (all_libpath): Accumulate across all enabled targets.

54
ld/emultempl/armcoff.em
View file

@ -44,17 +44,21 @@ static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
static int gld${EMULATION_NAME}_parse_args PARAMS((int, char **));
static void gld${EMULATION_NAME}_list_options PARAMS ((FILE *));
static void gld_${EMULATION_NAME}_finish PARAMS ((void));
/* If true, then interworking stubs which support calls to old, non-interworking
aware ARM code should be generated. */
static int support_old_code = 0;
static char * thumb_entry_symbol = NULL;
#define OPTION_SUPPORT_OLD_CODE 300
#define OPTION_THUMB_ENTRY 301
static struct option longopts[] =
{
{"support-old-code", no_argument, NULL, OPTION_SUPPORT_OLD_CODE},
{"thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
{NULL, no_argument, NULL, 0}
};
@ -63,6 +67,7 @@ gld${EMULATION_NAME}_list_options (file)
FILE * file;
{
fprintf (file, _(" --support-old-code Support interworking with old code\n"));
fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
}
static int
@ -97,6 +102,10 @@ gld${EMULATION_NAME}_parse_args (argc, argv)
case OPTION_SUPPORT_OLD_CODE:
support_old_code = 1;
break;
case OPTION_THUMB_ENTRY:
thumb_entry_symbol = optarg;
break;
}
return 1;
@ -146,6 +155,49 @@ gld${EMULATION_NAME}_after_open ()
}
}
static void
gld${EMULATION_NAME}_finish PARAMS((void))
{
struct bfd_link_hash_entry * h;
if (thumb_entry_symbol == NULL)
return;
h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, false, false, true);
if (h != (struct bfd_link_hash_entry *) NULL
&& (h->type == bfd_link_hash_defined
|| h->type == bfd_link_hash_defweak)
&& h->u.def.section->output_section != NULL)
{
static char buffer[32];
bfd_vma val;
/* Special procesing is required for a Thumb entry symbol. The
bottom bit of its address must be set. */
val = (h->u.def.value
+ bfd_get_section_vma (output_bfd,
h->u.def.section->output_section)
+ h->u.def.section->output_offset);
val |= 1;
/* Now convert this value into a string and store it in entry_symbol
where the lang_finish() function will pick it up. */
buffer[0] = '0';
buffer[1] = 'x';
sprintf_vma (buffer + 2, val);
if (entry_symbol != NULL && entry_from_cmdline)
einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
thumb_entry_symbol, entry_symbol);
entry_symbol = buffer;
}
else
einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
}
static char *
gld${EMULATION_NAME}_get_script (isfile)
int *isfile;
@ -214,7 +266,7 @@ struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
gld${EMULATION_NAME}_get_script,
"${EMULATION_NAME}",
"${OUTPUT_FORMAT}",
NULL, /* finish */
gld${EMULATION_NAME}_finish, /* finish */
NULL, /* create output section statements */
NULL, /* open dynamic archive */
NULL, /* place orphan */

55
ld/emultempl/armelf.em
View file

@ -65,13 +65,18 @@ static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
static int gld${EMULATION_NAME}_parse_args PARAMS((int, char **));
static void gld${EMULATION_NAME}_list_options PARAMS ((FILE *));
static void gld_${EMULATION_NAME}_finish PARAMS ((void));
static int no_pipeline_knowledge = 0;
static char * thumb_entry_symbol = NULL;
#define OPTION_THUMB_ENTRY 301
static struct option longopts[] =
{
{ "no-pipeline-knowledge", no_argument, NULL, 'p'},
{ "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
{ NULL, no_argument, NULL, 0 }
};
@ -80,6 +85,7 @@ gld${EMULATION_NAME}_list_options (file)
FILE * file;
{
fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
}
static int
@ -114,6 +120,10 @@ gld${EMULATION_NAME}_parse_args (argc, argv)
case 'p':
no_pipeline_knowledge = 1;
break;
case OPTION_THUMB_ENTRY:
thumb_entry_symbol = optarg;
break;
}
return 1;
@ -1136,6 +1146,49 @@ gld${EMULATION_NAME}_before_allocation ()
bfd_elf32_arm_allocate_interworking_sections (& link_info);
}
static void
gld${EMULATION_NAME}_finish PARAMS((void))
{
struct bfd_link_hash_entry * h;
if (thumb_entry_symbol == NULL)
return;
h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, false, false, true);
if (h != (struct bfd_link_hash_entry *) NULL
&& (h->type == bfd_link_hash_defined
|| h->type == bfd_link_hash_defweak)
&& h->u.def.section->output_section != NULL)
{
static char buffer[32];
bfd_vma val;
/* Special procesing is required for a Thumb entry symbol. The
bottom bit of its address must be set. */
val = (h->u.def.value
+ bfd_get_section_vma (output_bfd,
h->u.def.section->output_section)
+ h->u.def.section->output_offset);
val |= 1;
/* Now convert this value into a string and store it in entry_symbol
where the lang_finish() function will pick it up. */
buffer[0] = '0';
buffer[1] = 'x';
sprintf_vma (buffer + 2, val);
if (entry_symbol != NULL && entry_from_cmdline)
einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
thumb_entry_symbol, entry_symbol);
entry_symbol = buffer;
}
else
einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
}
static char *
gld${EMULATION_NAME}_get_script (isfile)
int *isfile;
@ -1204,7 +1257,7 @@ struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
gld${EMULATION_NAME}_get_script,
"${EMULATION_NAME}",
"${OUTPUT_FORMAT}",
NULL, /* finish */
gld${EMULATION_NAME}_finish, /* finish */
NULL, /* create output section statements */
gld${EMULATION_NAME}_open_dynamic_archive,
gld${EMULATION_NAME}_place_orphan,

49
ld/emultempl/pe.em
View file

@ -74,10 +74,12 @@ static void gld${EMULATION_NAME}_place_section
PARAMS ((lang_statement_union_type *));
static char *gld_${EMULATION_NAME}_get_script PARAMS ((int *));
static int gld_${EMULATION_NAME}_parse_args PARAMS ((int, char **));
static void gld_${EMULATION_NAME}_finish PARAMS ((void));
static struct internal_extra_pe_aouthdr pe;
static int dll;
static int support_old_code = 0;
static char * thumb_entry_symbol = NULL;
extern def_file *pe_def_file;
static lang_assignment_statement_type *image_base_statement = 0;
@ -126,6 +128,7 @@ gld_${EMULATION_NAME}_before_parse()
#define OPTION_ENABLE_STDCALL_FIXUP (OPTION_STDCALL_ALIASES + 1)
#define OPTION_DISABLE_STDCALL_FIXUP (OPTION_ENABLE_STDCALL_FIXUP + 1)
#define OPTION_IMPLIB_FILENAME (OPTION_DISABLE_STDCALL_FIXUP + 1)
#define OPTION_THUMB_ENTRY (OPTION_IMPLIB_FILENAME + 1)
static struct option longopts[] =
{
@ -145,6 +148,7 @@ static struct option longopts[] =
{"stack", required_argument, NULL, OPTION_STACK},
{"subsystem", required_argument, NULL, OPTION_SUBSYSTEM},
{"support-old-code", no_argument, NULL, OPTION_SUPPORT_OLD_CODE},
{"thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
#ifdef DLL_SUPPORT
/* getopt allows abbreviations, so we do this to stop it from treating -o
as an abbreviation for this option */
@ -219,6 +223,7 @@ gld_${EMULATION_NAME}_list_options (file)
fprintf (file, _(" --stack <size> Set size of the initial stack\n"));
fprintf (file, _(" --subsystem <name>[:<version>] Set required OS subsystem [& version]\n"));
fprintf (file, _(" --support-old-code Support interworking with old code\n"));
fprintf (file, _(" --thumb-entry=<symbol> Set the entry point to be Thumb <symbol>\n"));
#ifdef DLL_SUPPORT
fprintf (file, _(" --add-stdcall-alias Export symbols with and without @nn\n"));
fprintf (file, _(" --disable-stdcall-fixup Don't link _sym to _sym@nn\n"));
@ -427,6 +432,9 @@ gld_${EMULATION_NAME}_parse_args(argc, argv)
case OPTION_SUPPORT_OLD_CODE:
support_old_code = 1;
break;
case OPTION_THUMB_ENTRY:
thumb_entry_symbol = optarg;
break;
#ifdef DLL_SUPPORT
case OPTION_OUT_DEF:
pe_out_def_filename = xstrdup (optarg);
@ -884,6 +892,47 @@ gld_${EMULATION_NAME}_recognized_file(entry)
static void
gld_${EMULATION_NAME}_finish ()
{
#if defined(TARGET_IS_armpe) || defined(TARGET_IS_arm_epoc_pe)
struct bfd_link_hash_entry * h;
if (thumb_entry_symbol != NULL)
{
h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, false, false, true);
if (h != (struct bfd_link_hash_entry *) NULL
&& (h->type == bfd_link_hash_defined
|| h->type == bfd_link_hash_defweak)
&& h->u.def.section->output_section != NULL)
{
static char buffer[32];
bfd_vma val;
/* Special procesing is required for a Thumb entry symbol. The
bottom bit of its address must be set. */
val = (h->u.def.value
+ bfd_get_section_vma (output_bfd,
h->u.def.section->output_section)
+ h->u.def.section->output_offset);
val |= 1;
/* Now convert this value into a string and store it in entry_symbol
where the lang_finish() function will pick it up. */
buffer[0] = '0';
buffer[1] = 'x';
sprintf_vma (buffer + 2, val);
if (entry_symbol != NULL && entry_from_cmdline)
einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
thumb_entry_symbol, entry_symbol);
entry_symbol = buffer;
}
else
einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
}
#endif /* defined(TARGET_IS_armpe) || defined(TARGET_IS_arm_epoc_pe) */
#ifdef DLL_SUPPORT
if (link_info.shared)
{

11
ld/ld.texinfo
View file

@ -3879,7 +3879,7 @@ not itself call any subroutines).
@section @code{ld}'s support for interworking between ARM and Thumb code
@cindex ARM interworking support
@cindex --support-old-code
@kindex --support-old-code
For the ARM, @code{ld} will generate code stubs to allow functions calls
betweem ARM and Thumb code. These stubs only work with code that has
been compiled and assembled with the @samp{-mthumb-interwork} command
@ -3891,6 +3891,15 @@ which will work with non-interworking aware ARM code. Note, however,
the linker does not support generating stubs for function calls to
non-interworking aware Thumb code.
@cindex thumb entry point
@cindex entry point, thumb
@kindex --thumb-entry=@var{entry}
The @samp{--thumb-entry} switch is a duplicate of the generic
@samp{--entry} switch, in that it sets the program's starting address.
But it also sets the bottom bit of the address, so that it can be
branched to using a BX instruction, and the program will start
executing in Thumb mode straight away.
@ifclear GENERIC
@lowersections
@end ifclear