-# File to either setup register 2 to point to the GOT, or to adjust the
-# pointers in the .got2 section to point to their new addresses.
+/*
+ * Special support for eabi and SVR4
+ *
+ * Copyright (C) 1995, 1996, 1998, 2000, 2001 Free Software Foundation, Inc.
+ * Written By Michael Meissner
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * In addition to the permissions in the GNU General Public License, the
+ * Free Software Foundation gives you unlimited permission to link the
+ * compiled version of this file with other programs, and to distribute
+ * those programs without any restriction coming from the use of this
+ * file. (The General Public License restrictions do apply in other
+ * respects; for example, they cover modification of the file, and
+ * distribution when not linked into another program.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * As a special exception, if you link this library with files
+ * compiled with GCC to produce an executable, this does not cause
+ * the resulting executable to be covered by the GNU General Public License.
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ */
+
+/* Do any initializations needed for the eabi environment */
.file "eabi.asm"
.section ".text"
- .globl __eabi
+ #include "ppc-asm.h"
+
+#ifndef __powerpc64__
.section ".got2","aw"
-.LCTOC1 = . # +32768
+ .align 2
+.LCTOC1 = . /* +32768 */
-# Table of addresses
+/* Table of addresses */
.Ltable = .-.LCTOC1
- .long .LCTOC1 # address we are really at
+ .long .LCTOC1 /* address we are really at */
+
+.Lsda = .-.LCTOC1
+ .long _SDA_BASE_ /* address of the first small data area */
+
+.Lsdas = .-.LCTOC1
+ .long __SDATA_START__ /* start of .sdata/.sbss section */
+
+.Lsdae = .-.LCTOC1
+ .long __SBSS_END__ /* end of .sdata/.sbss section */
+
+.Lsda2 = .-.LCTOC1
+ .long _SDA2_BASE_ /* address of the second small data area */
+
+.Lsda2s = .-.LCTOC1
+ .long __SDATA2_START__ /* start of .sdata2/.sbss2 section */
+
+.Lsda2e = .-.LCTOC1
+ .long __SBSS2_END__ /* end of .sdata2/.sbss2 section */
-.Lgot = .-.LCTOC1
- .long _GLOBAL_OFFSET_TABLE_ # normal GOT address
+#ifdef _RELOCATABLE
+.Lgots = .-.LCTOC1
+ .long __GOT_START__ /* Global offset table start */
+
+.Lgotm1 = .-.LCTOC1
+ .long _GLOBAL_OFFSET_TABLE_-4 /* end of GOT ptrs before BLCL + 3 reserved words */
+
+.Lgotm2 = .-.LCTOC1
+ .long _GLOBAL_OFFSET_TABLE_+12 /* start of GOT ptrs after BLCL + 3 reserved words */
+
+.Lgote = .-.LCTOC1
+ .long __GOT_END__ /* Global offset table end */
.Lgot2s = .-.LCTOC1
- .long _GOT2_START_ # -mrelocatable GOT pointers start
+ .long __GOT2_START__ /* -mrelocatable GOT pointers start */
.Lgot2e = .-.LCTOC1
- .long _GOT2_END_ # -mrelocatable GOT pointers end
+ .long __GOT2_END__ /* -mrelocatable GOT pointers end */
+
+.Lfixups = .-.LCTOC1
+ .long __FIXUP_START__ /* start of .fixup section */
+
+.Lfixupe = .-.LCTOC1
+ .long __FIXUP_END__ /* end of .fixup section */
+
+.Lctors = .-.LCTOC1
+ .long __CTOR_LIST__ /* start of .ctor section */
+
+.Lctore = .-.LCTOC1
+ .long __CTOR_END__ /* end of .ctor section */
+
+.Ldtors = .-.LCTOC1
+ .long __DTOR_LIST__ /* start of .dtor section */
+
+.Ldtore = .-.LCTOC1
+ .long __DTOR_END__ /* end of .dtor section */
+
+.Lexcepts = .-.LCTOC1
+ .long __EXCEPT_START__ /* start of .gcc_except_table section */
+
+.Lexcepte = .-.LCTOC1
+ .long __EXCEPT_END__ /* end of .gcc_except_table section */
+
+.Linit = .-.LCTOC1
+ .long .Linit_p /* address of variable to say we've been called */
+
+ .text
+ .align 2
+.Lptr:
+ .long .LCTOC1-.Laddr /* PC relative pointer to .got2 */
+#endif
+
+ .data
+ .align 2
+.Linit_p:
+ .long 0
.text
-.Lptr: .long .LCTOC1-.Laddr # PC relative pointer to .got2
- .long 0x4000 # traceback table
-
-__eabi: mflr 0
- bl .Laddr # get current address
-.Laddr: mflr 12 # real address of .Laddr
- lwz 11,(.Lptr-.Laddr)(12) # linker generated address of .LCTOC1
- add 11,11,12 # correct to real pointer
- lwz 12,.Ltable(11) # get linker's idea of where .Laddr is
- subf. 12,12,11 # calculate difference
- bc 4,2,.Lreloc # skip if we need to relocate
-
-# Normal program, load up register 2
-
- mtlr 0 # restore link register
- lwz 2,.Lgot(11) # normal GOT address
- blr
-
-# We need to relocate the .got2 pointers. Don't load register 2
-
-.Lreloc:
- stwu 30,-4(1)
- stwu 31,-4(1)
- lwz 30,.Lgot2s(11) # GOT pointers start
- lwz 31,.Lgot2e(11) # GOT pointers end
- add 30,12,30 # adjust pointers
- add 31,12,31
-
- cmpw 1,30,31 # any pointers to adjust
- bc 12,6,.Ldone
-
-.Lloop: lwz 11,0(30) # next pointer
- add 11,11,12 # adjust
- stw 11,0(30)
- addi 30,30,4 # bump to next word
- cmpw 1,30,31 # more pointers to adjust?
- bc 4,6,.Lloop
-
-# Done adjusting pointers, return
+
+FUNC_START(__eabi)
+
+/* Eliminate -mrelocatable code if not -mrelocatable, so that this file can
+ be assembled with other assemblers than GAS. */
+
+#ifndef _RELOCATABLE
+ addis 10,0,.Linit_p@ha /* init flag */
+ addis 11,0,.LCTOC1@ha /* load address of .LCTOC1 */
+ lwz 9,.Linit_p@l(10) /* init flag */
+ addi 11,11,.LCTOC1@l
+ cmplwi 2,9,0 /* init flag != 0? */
+ bnelr 2 /* return now, if we've been called already */
+ stw 1,.Linit_p@l(10) /* store a nonzero value in the done flag */
+
+#else /* -mrelocatable */
+ mflr 0
+ bl .Laddr /* get current address */
+.Laddr:
+ mflr 12 /* real address of .Laddr */
+ lwz 11,(.Lptr-.Laddr)(12) /* linker generated address of .LCTOC1 */
+ add 11,11,12 /* correct to real pointer */
+ lwz 12,.Ltable(11) /* get linker's idea of where .Laddr is */
+ lwz 10,.Linit(11) /* address of init flag */
+ subf. 12,12,11 /* calculate difference */
+ lwzx 9,10,12 /* done flag */
+ cmplwi 2,9,0 /* init flag != 0? */
+ mtlr 0 /* restore in case branch was taken */
+ bnelr 2 /* return now, if we've been called already */
+ stwx 1,10,12 /* store a nonzero value in the done flag */
+ beq+ 0,.Lsdata /* skip if we don't need to relocate */
+
+/* We need to relocate the .got2 pointers. */
+
+ lwz 3,.Lgot2s(11) /* GOT2 pointers start */
+ lwz 4,.Lgot2e(11) /* GOT2 pointers end */
+ add 3,12,3 /* adjust pointers */
+ add 4,12,4
+ bl FUNC_NAME(__eabi_convert) /* convert pointers in .got2 section */
+
+/* Fixup the .ctor section for static constructors */
+
+ lwz 3,.Lctors(11) /* constructors pointers start */
+ lwz 4,.Lctore(11) /* constructors pointers end */
+ bl FUNC_NAME(__eabi_convert) /* convert constructors */
+
+/* Fixup the .dtor section for static destructors */
+
+ lwz 3,.Ldtors(11) /* destructors pointers start */
+ lwz 4,.Ldtore(11) /* destructors pointers end */
+ bl FUNC_NAME(__eabi_convert) /* convert destructors */
+
+/* Fixup the .gcc_except_table section for G++ exceptions */
+
+ lwz 3,.Lexcepts(11) /* exception table pointers start */
+ lwz 4,.Lexcepte(11) /* exception table pointers end */
+ bl FUNC_NAME(__eabi_convert) /* convert exceptions */
+
+/* Fixup the addresses in the GOT below _GLOBAL_OFFSET_TABLE_-4 */
+
+ lwz 3,.Lgots(11) /* GOT table pointers start */
+ lwz 4,.Lgotm1(11) /* GOT table pointers below _GLOBAL_OFFSET_TABLE-4 */
+ bl FUNC_NAME(__eabi_convert) /* convert lower GOT */
+
+/* Fixup the addresses in the GOT above _GLOBAL_OFFSET_TABLE_+12 */
+
+ lwz 3,.Lgotm2(11) /* GOT table pointers above _GLOBAL_OFFSET_TABLE+12 */
+ lwz 4,.Lgote(11) /* GOT table pointers end */
+ bl FUNC_NAME(__eabi_convert) /* convert lower GOT */
+
+/* Fixup any user initialized pointers now (the compiler drops pointers to */
+/* each of the relocs that it does in the .fixup section). */
+
+.Lfix:
+ lwz 3,.Lfixups(11) /* fixup pointers start */
+ lwz 4,.Lfixupe(11) /* fixup pointers end */
+ bl FUNC_NAME(__eabi_uconvert) /* convert user initialized pointers */
+
+.Lsdata:
+ mtlr 0 /* restore link register */
+#endif /* _RELOCATABLE */
+
+/* Only load up register 13 if there is a .sdata and/or .sbss section */
+ lwz 3,.Lsdas(11) /* start of .sdata/.sbss section */
+ lwz 4,.Lsdae(11) /* end of .sdata/.sbss section */
+ cmpw 1,3,4 /* .sdata/.sbss section non-empty? */
+ beq- 1,.Lsda2l /* skip loading r13 */
+
+ lwz 13,.Lsda(11) /* load r13 with _SDA_BASE_ address */
+
+/* Only load up register 2 if there is a .sdata2 and/or .sbss2 section */
+
+.Lsda2l:
+ lwz 3,.Lsda2s(11) /* start of .sdata/.sbss section */
+ lwz 4,.Lsda2e(11) /* end of .sdata/.sbss section */
+ cmpw 1,3,4 /* .sdata/.sbss section non-empty? */
+ beq+ 1,.Ldone /* skip loading r2 */
+
+ lwz 2,.Lsda2(11) /* load r2 with _SDA2_BASE_ address */
+
+/* Done adjusting pointers, return by way of doing the C++ global constructors. */
.Ldone:
- mtlr 0 # restore link register
- lwz 31,0(1)
- lwz 30,4(1) # restore regs
- addic 1,1,8 # pop stack
- blr
+ b FUNC_NAME(__init) /* do any C++ global constructors (which returns to caller) */
+FUNC_END(__eabi)
+
+/* Special subroutine to convert a bunch of pointers directly.
+ r0 has original link register
+ r3 has low pointer to convert
+ r4 has high pointer to convert
+ r5 .. r10 are scratch registers
+ r11 has the address of .LCTOC1 in it.
+ r12 has the value to add to each pointer
+ r13 .. r31 are unchanged */
+
+FUNC_START(__eabi_convert)
+ cmplw 1,3,4 /* any pointers to convert? */
+ subf 5,3,4 /* calculate number of words to convert */
+ bclr 4,4 /* return if no pointers */
+
+ srawi 5,5,2
+ addi 3,3,-4 /* start-4 for use with lwzu */
+ mtctr 5
+
+.Lcvt:
+ lwzu 6,4(3) /* pointer to convert */
+ cmpwi 0,6,0
+ beq- .Lcvt2 /* if pointer is null, don't convert */
+
+ add 6,6,12 /* convert pointer */
+ stw 6,0(3)
+.Lcvt2:
+ bdnz+ .Lcvt
+ blr
+
+FUNC_END(__eabi_convert)
+
+/* Special subroutine to convert the pointers the user has initialized. The
+ compiler has placed the address of the initialized pointer into the .fixup
+ section.
+
+ r0 has original link register
+ r3 has low pointer to convert
+ r4 has high pointer to convert
+ r5 .. r10 are scratch registers
+ r11 has the address of .LCTOC1 in it.
+ r12 has the value to add to each pointer
+ r13 .. r31 are unchanged */
+
+FUNC_START(__eabi_uconvert)
+ cmplw 1,3,4 /* any pointers to convert? */
+ subf 5,3,4 /* calculate number of words to convert */
+ bclr 4,4 /* return if no pointers */
+
+ srawi 5,5,2
+ addi 3,3,-4 /* start-4 for use with lwzu */
+ mtctr 5
+
+.Lucvt:
+ lwzu 6,4(3) /* next pointer to pointer to convert */
+ add 6,6,12 /* adjust pointer */
+ lwz 7,0(6) /* get the pointer it points to */
+ stw 6,0(3) /* store adjusted pointer */
+ add 7,7,12 /* adjust */
+ stw 7,0(6)
+ bdnz+ .Lucvt
+ blr
+
+FUNC_END(__eabi_uconvert)
+
+#endif
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