This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: .init_array/.fini_array
- From: Alan Modra <amodra at bigpond dot net dot au>
- To: Steve Ellcey <sje at cup dot hp dot com>
- Cc: binutils at sources dot redhat dot com, gcc at gcc dot gnu dot org
- Date: Tue, 22 Oct 2002 12:19:24 +0930
- Subject: Re: .init_array/.fini_array
- References: <200210211637.JAA17942@hpsje.cup.hp.com>
On Mon, Oct 21, 2002 at 09:37:34AM -0700, Steve Ellcey wrote:
>
> I have a question about the .init_array and .fini_array ELF sections.
> In gas/config/obj-elf.c these are defined as standard SHT_PROGBITS
> sections instead of special SHT_INIT_ARRAY or SHT_FINI_ARRAY sections.
> The file contains the comment:
>
> /* FIXME: The current gcc, as of 2002-03-03, will emit
>
> .section .init_array,"aw",@progbits
>
> for __attribute__ ((section (".init_array"))). "@progbits" marks
> the incorrect section type. For now, we make them with
> SHT_PROGBITS. BFD will fix the section type. Gcc should be changed
> to emit
>
> .section .init_array
>
> I was wondering if there has been any change in this status? On HP-UX
> IA64 I am using the HP linker and it handles these sections so I would
> like them to have their correct definitions.
>
> Rather then use
>
> .section .init_array
>
> in GCC I am currently putting out:
>
> .section .init_array, "aw", "init_array"
>
> for this section based on CTORS_SECTION_ASM_OP in config/ia64/hpux.h and
> I need the correct definition of .init_array/.fini_array/.preinit_array
> for this to work.
Hmm, current gcc still emits
.section .init_array,"aw",@progbits
for
int foo (void) { return 1; }
int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
gcc really needs fixing first, otherwise we'll get flooded with bug
reports that gas is complaining about incorrect section types.
Like this.
gcc/ChangeLog
* output.h (SECTION_NOTYPE): Define.
* varasm.c (default_section_type_flags_1): Set SECTION_NOTYPE for
init array sections.
(default_elf_asm_named_section): Mind SECTION_NOTYPE.
* config/arm/arm.c (arm_elf_asm_named_section): Likewise. Also
merge TLS support.
When the above is OK'd for mainline gcc I'll commit the following
gas patch.
gas/ChangeLog
* config/obj-elf.c (special_sections): Use correct types for init
array sections.
(obj_elf_change_section): Don't mess with init array section type.
Index: gcc/output.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/output.h,v
retrieving revision 1.113
diff -u -p -r1.113 output.h
--- gcc/output.h 26 Sep 2002 22:25:12 -0000 1.113
+++ gcc/output.h 22 Oct 2002 02:03:28 -0000
@@ -485,7 +485,8 @@ extern void no_asm_to_stream PARAMS ((FI
embedded zeros */
#define SECTION_OVERRIDE 0x20000 /* allow override of default flags */
#define SECTION_TLS 0x40000 /* contains thread-local storage */
-#define SECTION_MACH_DEP 0x80000 /* subsequent bits reserved for target */
+#define SECTION_NOTYPE 0x80000 /* don't output @progbits */
+#define SECTION_MACH_DEP 0x100000 /* subsequent bits reserved for target */
extern unsigned int get_named_section_flags PARAMS ((const char *));
extern bool set_named_section_flags PARAMS ((const char *, unsigned int));
Index: gcc/varasm.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/varasm.c,v
retrieving revision 1.315
diff -u -p -r1.315 varasm.c
--- gcc/varasm.c 11 Oct 2002 01:28:24 -0000 1.315
+++ gcc/varasm.c 22 Oct 2002 02:03:36 -0000
@@ -4828,6 +4828,12 @@ default_section_type_flags_1 (decl, name
|| strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
flags |= SECTION_TLS;
+ if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
+ && (strcmp (name, ".init_array") == 0
+ || strcmp (name, ".fini_array") == 0
+ || strcmp (name, ".preinit_array") == 0))
+ flags |= SECTION_NOTYPE;
+
return flags;
}
@@ -4850,7 +4856,6 @@ default_elf_asm_named_section (name, fla
unsigned int flags;
{
char flagchars[10], *f = flagchars;
- const char *type;
if (! named_section_first_declaration (name))
{
@@ -4874,17 +4879,24 @@ default_elf_asm_named_section (name, fla
*f++ = 'T';
*f = '\0';
- if (flags & SECTION_BSS)
- type = "nobits";
- else
- type = "progbits";
-
- if (flags & SECTION_ENTSIZE)
- fprintf (asm_out_file, "\t.section\t%s,\"%s\",@%s,%d\n",
- name, flagchars, type, flags & SECTION_ENTSIZE);
- else
- fprintf (asm_out_file, "\t.section\t%s,\"%s\",@%s\n",
- name, flagchars, type);
+ fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
+
+ if (!(flags & SECTION_NOTYPE))
+ {
+ const char *type;
+
+ if (flags & SECTION_BSS)
+ type = "nobits";
+ else
+ type = "progbits";
+
+ fprintf (asm_out_file, ",@%s", type);
+
+ if (flags & SECTION_ENTSIZE)
+ fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
+ }
+
+ putc ('\n', asm_out_file);
}
void
Index: gcc/config/arm/arm.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/arm/arm.c,v
retrieving revision 1.237
diff -u -p -r1.237 arm.c
--- gcc/config/arm/arm.c 20 Oct 2002 22:37:09 -0000 1.237
+++ gcc/config/arm/arm.c 22 Oct 2002 02:46:10 -0000
@@ -11068,8 +11068,13 @@ arm_elf_asm_named_section (name, flags)
const char *name;
unsigned int flags;
{
- char flagchars[8], *f = flagchars;
- const char *type;
+ char flagchars[10], *f = flagchars;
+
+ if (! named_section_first_declaration (name))
+ {
+ fprintf (asm_out_file, "\t.section\t%s\n", name);
+ return;
+ }
if (!(flags & SECTION_DEBUG))
*f++ = 'a';
@@ -11083,19 +11088,28 @@ arm_elf_asm_named_section (name, flags)
*f++ = 'M';
if (flags & SECTION_STRINGS)
*f++ = 'S';
+ if (flags & SECTION_TLS)
+ *f++ = 'T';
*f = '\0';
- if (flags & SECTION_BSS)
- type = "nobits";
- else
- type = "progbits";
-
- if (flags & SECTION_ENTSIZE)
- fprintf (asm_out_file, "\t.section\t%s,\"%s\",%%%s,%d\n",
- name, flagchars, type, flags & SECTION_ENTSIZE);
- else
- fprintf (asm_out_file, "\t.section\t%s,\"%s\",%%%s\n",
- name, flagchars, type);
+ fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
+
+ if (!(flags & SECTION_NOTYPE))
+ {
+ const char *type;
+
+ if (flags & SECTION_BSS)
+ type = "nobits";
+ else
+ type = "progbits";
+
+ fprintf (asm_out_file, ",%%%s", type);
+
+ if (flags & SECTION_ENTSIZE)
+ fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
+ }
+
+ putc ('\n', asm_out_file);
}
#endif
Index: gas/config/obj-elf.c
===================================================================
RCS file: /cvs/src/src/gas/config/obj-elf.c,v
retrieving revision 1.55
diff -u -p -r1.55 obj-elf.c
--- gas/config/obj-elf.c 17 Sep 2002 07:38:14 -0000 1.55
+++ gas/config/obj-elf.c 22 Oct 2002 00:25:59 -0000
@@ -617,27 +617,9 @@ static struct special_section const spec
{ ".tbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_TLS },
{ ".tdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_TLS },
{ ".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
-#if 0
- /* FIXME: The current gcc, as of 2002-03-03, will emit
-
- .section .init_array,"aw",@progbits
-
- for __attribute__ ((section (".init_array"))). "@progbits" marks
- the incorrect section type. For now, we make them with
- SHT_PROGBITS. BFD will fix the section type. Gcc should be changed
- to emit
-
- .section .init_array
-
- */
{ ".init_array",SHT_INIT_ARRAY, SHF_ALLOC + SHF_WRITE },
{ ".fini_array",SHT_FINI_ARRAY, SHF_ALLOC + SHF_WRITE },
{ ".preinit_array",SHT_PREINIT_ARRAY, SHF_ALLOC + SHF_WRITE },
-#else
- { ".init_array",SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
- { ".fini_array",SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
- { ".preinit_array",SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
-#endif
#ifdef ELF_TC_SPECIAL_SECTIONS
ELF_TC_SPECIAL_SECTIONS
@@ -707,7 +689,16 @@ obj_elf_change_section (name, type, attr
type = special_sections[i].type;
else if (type != special_sections[i].type)
{
- if (old_sec == NULL)
+ if (old_sec == NULL
+ /* FIXME: gcc, as of 2002-10-22, will emit
+
+ .section .init_array,"aw",@progbits
+
+ for __attribute__ ((section (".init_array"))).
+ "@progbits" is incorrect. */
+ && special_sections[i].type != SHT_INIT_ARRAY
+ && special_sections[i].type != SHT_FINI_ARRAY
+ && special_sections[i].type != SHT_PREINIT_ARRAY)
{
as_warn (_("setting incorrect section type for %s"), name);
}
--
Alan Modra
IBM OzLabs - Linux Technology Centre