This is step 1 in an effort to unify the start-up files for the
various architectures. Now all the work is done in crtbegin.c. It doesn't contain any assembly language code, so it should work fine on all architectures. (I have tested it on the i386 and the alpha.) The old assembly language files crt[in].S are now empty shells that generate no code or data. They should not be removed any time soon, because the various versions of gcc in src and ports expect them to exist. Next I will move crtbegin.c into a new common machine-independent directory, and adjust the i386-elf Makefile to use that version. After that I will adjust the alpha Makefile to use the common version too. Requested by: obrien
This commit is contained in:
John Polstra
parent
026957712e
commit
f6d15b87f8
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=60698
@ -1,5 +1,5 @@
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/*-
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* Copyright 1996-1998 John D. Polstra.
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* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -25,28 +25,7 @@
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* $FreeBSD$
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*/
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/* See http://www.netbsd.org/Documentation/kernel/elf-notes.html for
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details on the ELF .note section as we are using it. */
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.section .note.ABI-tag, "a"
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.align 4
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.long 1f - 0f # name length
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.long 3f - 2f # data length
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.long 1 # note type
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0: .asciz "FreeBSD" # vendor name
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1: .align 4
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2: .long 500000 # data - ABI tag
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# (from __FreeBSD_version (param.h))
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3: .align 4 # pad out section
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.section .init,"ax",@progbits
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.align 4
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.globl _init
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.type _init,@function
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_init:
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.section .fini,"ax",@progbits
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.align 4
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.globl _fini
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.type _fini,@function
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_fini:
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/*
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* This file is not used any more. It will go away as soon as the gcc
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* linker specs have been updated accordingly.
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*/
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@ -1,5 +1,5 @@
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/*-
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* Copyright 1996-1998 John D. Polstra.
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* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -25,8 +25,7 @@
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* $FreeBSD$
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*/
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.section .init,"ax",@progbits
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ret
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.section .fini,"ax",@progbits
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ret
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/*
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* This file is not used any more. It will go away as soon as the gcc
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* linker specs have been updated accordingly.
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*/
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@ -1,5 +1,5 @@
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/*-
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* Copyright 1996-1998 John D. Polstra.
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* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -25,16 +25,17 @@
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#define ABI_VENDOR "FreeBSD"
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#define ABI_SECTION ".note.ABI-tag"
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#define ABI_NOTETYPE 1
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typedef void (*fptr)(void);
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static fptr ctor_list[1] __attribute__((section(".ctors"))) = { (fptr) -1 };
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static fptr dtor_list[1] __attribute__((section(".dtors"))) = { (fptr) -1 };
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static void do_ctors(void) __unused;
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static void do_dtors(void) __unused;
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static void
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do_ctors(void)
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{
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@ -55,5 +56,47 @@ do_dtors(void)
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(**fpp)();
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}
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__asm__(".section .init,\"ax\",@progbits; call do_ctors; .previous");
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__asm__(".section .fini,\"ax\",@progbits; call do_dtors; .previous");
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/*
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* With very large programs on some architectures (e.g., the Alpha),
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* it is possible to get relocation overflows on the limited
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* displacements of call/bsr instructions. It is particularly likely
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* for the calls from _init() and _fini(), because they are in
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* separate sections. Avoid the problem by forcing indirect calls.
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*/
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static void (*p_do_ctors)(void) = do_ctors;
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static void (*p_do_dtors)(void) = do_dtors;
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extern void _init(void) __attribute__((section(".init")));
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void
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_init(void)
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{
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(*p_do_ctors)();
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}
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extern void _fini(void) __attribute__((section(".fini")));
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void
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_fini(void)
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{
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(*p_do_dtors)();
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}
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/*
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* Special ".note" entry specifying the ABI version. See
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* http://www.netbsd.org/Documentation/kernel/elf-notes.html
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* for more information.
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*/
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static const struct {
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int32_t namesz;
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int32_t descsz;
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int32_t type;
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char name[sizeof ABI_VENDOR];
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int32_t desc;
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} abitag __attribute__ ((section (ABI_SECTION))) = {
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sizeof ABI_VENDOR,
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sizeof(int32_t),
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ABI_NOTETYPE,
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ABI_VENDOR,
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__FreeBSD_version
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};
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@ -1,5 +1,5 @@
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/*-
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* Copyright 1996-1998 John D. Polstra.
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* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -25,16 +25,17 @@
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#define ABI_VENDOR "FreeBSD"
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#define ABI_SECTION ".note.ABI-tag"
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#define ABI_NOTETYPE 1
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typedef void (*fptr)(void);
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static fptr ctor_list[1] __attribute__((section(".ctors"))) = { (fptr) -1 };
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static fptr dtor_list[1] __attribute__((section(".dtors"))) = { (fptr) -1 };
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static void do_ctors(void) __unused;
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static void do_dtors(void) __unused;
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static void
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do_ctors(void)
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{
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@ -55,5 +56,47 @@ do_dtors(void)
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(**fpp)();
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}
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__asm__(".section .init,\"ax\",@progbits; call do_ctors; .previous");
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__asm__(".section .fini,\"ax\",@progbits; call do_dtors; .previous");
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/*
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* With very large programs on some architectures (e.g., the Alpha),
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* it is possible to get relocation overflows on the limited
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* displacements of call/bsr instructions. It is particularly likely
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* for the calls from _init() and _fini(), because they are in
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* separate sections. Avoid the problem by forcing indirect calls.
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*/
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static void (*p_do_ctors)(void) = do_ctors;
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static void (*p_do_dtors)(void) = do_dtors;
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extern void _init(void) __attribute__((section(".init")));
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void
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_init(void)
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{
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(*p_do_ctors)();
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}
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extern void _fini(void) __attribute__((section(".fini")));
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void
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_fini(void)
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{
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(*p_do_dtors)();
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}
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/*
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* Special ".note" entry specifying the ABI version. See
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* http://www.netbsd.org/Documentation/kernel/elf-notes.html
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* for more information.
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*/
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static const struct {
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int32_t namesz;
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int32_t descsz;
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int32_t type;
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char name[sizeof ABI_VENDOR];
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int32_t desc;
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} abitag __attribute__ ((section (ABI_SECTION))) = {
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sizeof ABI_VENDOR,
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sizeof(int32_t),
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ABI_NOTETYPE,
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ABI_VENDOR,
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__FreeBSD_version
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};
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@ -1,5 +1,5 @@
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/*-
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* Copyright 1996-1998 John D. Polstra.
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* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -25,28 +25,7 @@
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* $FreeBSD$
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*/
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/* See http://www.netbsd.org/Documentation/kernel/elf-notes.html for
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details on the ELF .note section as we are using it. */
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.section .note.ABI-tag, "a"
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.align 4
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.long 1f - 0f # name length
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.long 3f - 2f # data length
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.long 1 # note type
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0: .asciz "FreeBSD" # vendor name
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1: .align 4
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2: .long 500000 # data - ABI tag
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# (from __FreeBSD_version (param.h))
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3: .align 4 # pad out section
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.section .init,"ax",@progbits
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.align 4
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.globl _init
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.type _init,@function
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_init:
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.section .fini,"ax",@progbits
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.align 4
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.globl _fini
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.type _fini,@function
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_fini:
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/*
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* This file is not used any more. It will go away as soon as the gcc
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* linker specs have been updated accordingly.
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*/
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@ -1,5 +1,5 @@
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/*-
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* Copyright 1996-1998 John D. Polstra.
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* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -25,8 +25,7 @@
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* $FreeBSD$
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*/
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.section .init,"ax",@progbits
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ret
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.section .fini,"ax",@progbits
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ret
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/*
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* This file is not used any more. It will go away as soon as the gcc
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* linker specs have been updated accordingly.
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*/
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