[PATCH] [POWERPC] Fix bootwrapper builds with newer gcc versions
Kumar Gala
galak at kernel.crashing.org
Fri May 2 18:11:57 EST 2008
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 <galak at kernel.crashing.org>
---
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, at 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
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