GCC 4.4.x looks to be adding support for generating out-of-line register saves/restores based on:
http://gcc.gnu.org/ml/gcc-patches/2008-04/msg01678.html This breaks the bootwrapper as we'd need to link with libgcc to get the implementation of the register save/restores. To workaround this issue, we just stole the save/restore code from gcc and simplified it down for our needs (integer only). Signed-off-by: Kumar Gala <[EMAIL PROTECTED]> --- arch/powerpc/boot/Makefile | 2 +- arch/powerpc/boot/crtsavres.S | 125 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 126 insertions(+), 1 deletions(-) create mode 100644 arch/powerpc/boot/crtsavres.S diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile index 7822d25..77645a3 100644 --- a/arch/powerpc/boot/Makefile +++ b/arch/powerpc/boot/Makefile @@ -51,7 +51,7 @@ $(addprefix $(obj)/,$(zlib) gunzip_util.o main.o): \ $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader)) src-libfdt := fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c -src-wlib := string.S crt0.S stdio.c main.c \ +src-wlib := string.S crt0.S crtsavres.S stdio.c main.c \ $(addprefix libfdt/,$(src-libfdt)) libfdt-wrapper.c \ ns16550.c serial.c simple_alloc.c div64.S util.S \ gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \ diff --git a/arch/powerpc/boot/crtsavres.S b/arch/powerpc/boot/crtsavres.S new file mode 100644 index 0000000..614f3c4 --- /dev/null +++ b/arch/powerpc/boot/crtsavres.S @@ -0,0 +1,125 @@ +/* + * Special support for eabi and SVR4 + * + * Copyright (C) 1995, 1996, 1998, 2000, 2001 Free Software Foundation, Inc. + * Written By Michael Meissner + * 64-bit support written by David Edelsohn + * + * 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, 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, 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 "crtsavres.S" + .section ".text" + +/* On PowerPC64 Linux, these functions are provided by the linker. */ +#ifndef __powerpc64__ + +#define FUNC_START(name) \ + .type name,@function; \ + .globl name; \ +name: + +/* Routines for saving integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer save area. */ + +FUNC_START(_savegpr_14) stw 14,-72(11) /* save gp registers */ +FUNC_START(_savegpr_15) stw 15,-68(11) +FUNC_START(_savegpr_16) stw 16,-64(11) +FUNC_START(_savegpr_17) stw 17,-60(11) +FUNC_START(_savegpr_18) stw 18,-56(11) +FUNC_START(_savegpr_19) stw 19,-52(11) +FUNC_START(_savegpr_20) stw 20,-48(11) +FUNC_START(_savegpr_21) stw 21,-44(11) +FUNC_START(_savegpr_22) stw 22,-40(11) +FUNC_START(_savegpr_23) stw 23,-36(11) +FUNC_START(_savegpr_24) stw 24,-32(11) +FUNC_START(_savegpr_25) stw 25,-28(11) +FUNC_START(_savegpr_26) stw 26,-24(11) +FUNC_START(_savegpr_27) stw 27,-20(11) +FUNC_START(_savegpr_28) stw 28,-16(11) +FUNC_START(_savegpr_29) stw 29,-12(11) +FUNC_START(_savegpr_30) stw 30,-8(11) +FUNC_START(_savegpr_31) stw 31,-4(11) + blr + +/* Routines for restoring integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer restore area. */ + +FUNC_START(_restgpr_14) lwz 14,-72(11) /* restore gp registers */ +FUNC_START(_restgpr_15) lwz 15,-68(11) +FUNC_START(_restgpr_16) lwz 16,-64(11) +FUNC_START(_restgpr_17) lwz 17,-60(11) +FUNC_START(_restgpr_18) lwz 18,-56(11) +FUNC_START(_restgpr_19) lwz 19,-52(11) +FUNC_START(_restgpr_20) lwz 20,-48(11) +FUNC_START(_restgpr_21) lwz 21,-44(11) +FUNC_START(_restgpr_22) lwz 22,-40(11) +FUNC_START(_restgpr_23) lwz 23,-36(11) +FUNC_START(_restgpr_24) lwz 24,-32(11) +FUNC_START(_restgpr_25) lwz 25,-28(11) +FUNC_START(_restgpr_26) lwz 26,-24(11) +FUNC_START(_restgpr_27) lwz 27,-20(11) +FUNC_START(_restgpr_28) lwz 28,-16(11) +FUNC_START(_restgpr_29) lwz 29,-12(11) +FUNC_START(_restgpr_30) lwz 30,-8(11) +FUNC_START(_restgpr_31) lwz 31,-4(11) + blr + +/* Routines for restoring integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer restore area. */ + +FUNC_START(_restgpr_14_x) lwz 14,-72(11) /* restore gp registers */ +FUNC_START(_restgpr_15_x) lwz 15,-68(11) +FUNC_START(_restgpr_16_x) lwz 16,-64(11) +FUNC_START(_restgpr_17_x) lwz 17,-60(11) +FUNC_START(_restgpr_18_x) lwz 18,-56(11) +FUNC_START(_restgpr_19_x) lwz 19,-52(11) +FUNC_START(_restgpr_20_x) lwz 20,-48(11) +FUNC_START(_restgpr_21_x) lwz 21,-44(11) +FUNC_START(_restgpr_22_x) lwz 22,-40(11) +FUNC_START(_restgpr_23_x) lwz 23,-36(11) +FUNC_START(_restgpr_24_x) lwz 24,-32(11) +FUNC_START(_restgpr_25_x) lwz 25,-28(11) +FUNC_START(_restgpr_26_x) lwz 26,-24(11) +FUNC_START(_restgpr_27_x) lwz 27,-20(11) +FUNC_START(_restgpr_28_x) lwz 28,-16(11) +FUNC_START(_restgpr_29_x) lwz 29,-12(11) +FUNC_START(_restgpr_30_x) lwz 30,-8(11) +FUNC_START(_restgpr_31_x) lwz 0,4(11) + lwz 31,-4(11) + mtlr 0 + mr 1,11 + blr +#endif -- 1.5.4.1 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
