[PATCH v2 2/2] powerpc new toolchains fix (crt.S)
Maxim Uvarov
muvarov at gmail.com
Wed May 12 03:08:49 EDT 2010
Hello everybody,
Changes from previous version:
- removed bogus hyphen from the patch;
- move ifdefs to crt.S instead of Makefile
Please find here patch for user land kexec-tools application. Following
patch makes kexec-tools work for both kexec and kdump. I tested it with
git kernel (linus-tree) and Freescale/Logic MPC8360ERDK board with
mpc83xx_defconfig kernel config.
kexec:
kexec -l vmlinux --command-line="console= ... etc"
kexec -e
kdump:
kexec -p vmlinux_dump --command-line="console=... etc"
echo c > /proc/sysrq-trigger
I also think that is is reasonable:
- put GAME_CUBE specific code to separate files;
- combine ppc and ppc64 to powerpc directory (I'm planning to do it.
And that why in some places my patch have ifdefs for PPC64);
Best regards,
Maxim Uvarov.
From: Maxim Uvarov <muvarov at gmail.com>
Linker does not provide some vital functions when building freestanding
applications with a new toolchain, so we have to provide our own CRT.
p.s.
Without the CRT we won't see any build errors (since the purgatory is
linked with --no-undefined), but the purgatory code won't work,
'kexec -e' will just hang the board.
I added option to configure to keep code buildable for old toolchais.
But there should be way to do this automatically.
Author: Anton Vorontsov <avorontsov at ru.mvista.com>
Signed-off-by: Maxim Uvarov <muvarov at gmail.com>
Signed-off-by: Maxim Uvarov <muvarov at gmail.com>
---
configure.ac | 9 +
purgatory/arch/ppc/Makefile | 1
purgatory/arch/ppc/crt.S | 263 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 273 insertions(+), 0 deletions(-)
create mode 100644 purgatory/arch/ppc/crt.S
diff --git a/configure.ac b/configure.ac
index fcf50e4..63606bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -159,6 +159,15 @@ if test "$with_xen" = yes ; then
AC_MSG_NOTICE([Xen support disabled])))
fi
+dnl new toolchains
+if test "$ARCH" = ppc; then
+AC_ARG_WITH([oldtoolchain],
+ AC_HELP_STRING([--with-oldtoolchain],[compile without crt.S
+ required for new toolchains]),
+ AC_DEFINE(PPC_OLDTOOLCHAIN, 1,
+ [Define to compile with old toolchains]))
+fi
+
dnl ---Sanity checks
if test "$CC" = "no"; then AC_MSG_ERROR([cc not found]); fi
if test "$CPP" = "no"; then AC_MSG_ERROR([cpp not found]); fi
diff --git a/purgatory/arch/ppc/Makefile b/purgatory/arch/ppc/Makefile
index 72289a0..4020778 100644
--- a/purgatory/arch/ppc/Makefile
+++ b/purgatory/arch/ppc/Makefile
@@ -6,6 +6,7 @@ ppc_PURGATORY_SRCS += purgatory/arch/ppc/v2wrap_32.S
ppc_PURGATORY_SRCS += purgatory/arch/ppc/misc.S
ppc_PURGATORY_SRCS += purgatory/arch/ppc/purgatory-ppc.c
ppc_PURGATORY_SRCS += purgatory/arch/ppc/console-ppc.c
+ppc_PURGATORY_SRCS += purgatory/arch/ppc/crt.S
dist += purgatory/arch/ppc/Makefile $(ppc_PURGATORY_SRCS) \
purgatory/arch/ppc/purgatory-ppc.h purgatory/arch/ppc/ppc_asm.h
diff --git a/purgatory/arch/ppc/crt.S b/purgatory/arch/ppc/crt.S
new file mode 100644
index 0000000..70f4d61
--- /dev/null
+++ b/purgatory/arch/ppc/crt.S
@@ -0,0 +1,263 @@
+/* This is from linux-2.6/arch/powerpc/lib/crtsavres.S:
+ *
+ * Special support for eabi and SVR4
+ *
+ * Copyright (C) 1995, 1996, 1998, 2000, 2001 Free Software Foundation, Inc.
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ * Written By Michael Meissner
+ *
+ * Based on gcc/config/rs6000/crtsavres.asm from gcc
+ *
+ * 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.
+ */
+#include "config.h"
+
+/* On PowerPC64 Linux, these functions are provided by the linker. */
+#ifndef PPC_OLDTOOLCHAIN
+#ifndef __powerpc64__
+#define _GLOBAL(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. */
+
+_GLOBAL(_savegpr_14)
+_GLOBAL(_save32gpr_14)
+ stw 14,-72(11) /* save gp registers */
+_GLOBAL(_savegpr_15)
+_GLOBAL(_save32gpr_15)
+ stw 15,-68(11)
+_GLOBAL(_savegpr_16)
+_GLOBAL(_save32gpr_16)
+ stw 16,-64(11)
+_GLOBAL(_savegpr_17)
+_GLOBAL(_save32gpr_17)
+ stw 17,-60(11)
+_GLOBAL(_savegpr_18)
+_GLOBAL(_save32gpr_18)
+ stw 18,-56(11)
+_GLOBAL(_savegpr_19)
+_GLOBAL(_save32gpr_19)
+ stw 19,-52(11)
+_GLOBAL(_savegpr_20)
+_GLOBAL(_save32gpr_20)
+ stw 20,-48(11)
+_GLOBAL(_savegpr_21)
+_GLOBAL(_save32gpr_21)
+ stw 21,-44(11)
+_GLOBAL(_savegpr_22)
+_GLOBAL(_save32gpr_22)
+ stw 22,-40(11)
+_GLOBAL(_savegpr_23)
+_GLOBAL(_save32gpr_23)
+ stw 23,-36(11)
+_GLOBAL(_savegpr_24)
+_GLOBAL(_save32gpr_24)
+ stw 24,-32(11)
+_GLOBAL(_savegpr_25)
+_GLOBAL(_save32gpr_25)
+ stw 25,-28(11)
+_GLOBAL(_savegpr_26)
+_GLOBAL(_save32gpr_26)
+ stw 26,-24(11)
+_GLOBAL(_savegpr_27)
+_GLOBAL(_save32gpr_27)
+ stw 27,-20(11)
+_GLOBAL(_savegpr_28)
+_GLOBAL(_save32gpr_28)
+ stw 28,-16(11)
+_GLOBAL(_savegpr_29)
+_GLOBAL(_save32gpr_29)
+ stw 29,-12(11)
+_GLOBAL(_savegpr_30)
+_GLOBAL(_save32gpr_30)
+ stw 30,-8(11)
+_GLOBAL(_savegpr_31)
+_GLOBAL(_save32gpr_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. */
+
+_GLOBAL(_restgpr_14)
+_GLOBAL(_rest32gpr_14)
+ lwz 14,-72(11) /* restore gp registers */
+_GLOBAL(_restgpr_15)
+_GLOBAL(_rest32gpr_15)
+ lwz 15,-68(11)
+_GLOBAL(_restgpr_16)
+_GLOBAL(_rest32gpr_16)
+ lwz 16,-64(11)
+_GLOBAL(_restgpr_17)
+_GLOBAL(_rest32gpr_17)
+ lwz 17,-60(11)
+_GLOBAL(_restgpr_18)
+_GLOBAL(_rest32gpr_18)
+ lwz 18,-56(11)
+_GLOBAL(_restgpr_19)
+_GLOBAL(_rest32gpr_19)
+ lwz 19,-52(11)
+_GLOBAL(_restgpr_20)
+_GLOBAL(_rest32gpr_20)
+ lwz 20,-48(11)
+_GLOBAL(_restgpr_21)
+_GLOBAL(_rest32gpr_21)
+ lwz 21,-44(11)
+_GLOBAL(_restgpr_22)
+_GLOBAL(_rest32gpr_22)
+ lwz 22,-40(11)
+_GLOBAL(_restgpr_23)
+_GLOBAL(_rest32gpr_23)
+ lwz 23,-36(11)
+_GLOBAL(_restgpr_24)
+_GLOBAL(_rest32gpr_24)
+ lwz 24,-32(11)
+_GLOBAL(_restgpr_25)
+_GLOBAL(_rest32gpr_25)
+ lwz 25,-28(11)
+_GLOBAL(_restgpr_26)
+_GLOBAL(_rest32gpr_26)
+ lwz 26,-24(11)
+_GLOBAL(_restgpr_27)
+_GLOBAL(_rest32gpr_27)
+ lwz 27,-20(11)
+_GLOBAL(_restgpr_28)
+_GLOBAL(_rest32gpr_28)
+ lwz 28,-16(11)
+_GLOBAL(_restgpr_29)
+_GLOBAL(_rest32gpr_29)
+ lwz 29,-12(11)
+_GLOBAL(_restgpr_30)
+_GLOBAL(_rest32gpr_30)
+ lwz 30,-8(11)
+_GLOBAL(_restgpr_31)
+_GLOBAL(_rest32gpr_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. */
+
+_GLOBAL(_restgpr_14_x)
+_GLOBAL(_rest32gpr_14_x)
+ lwz 14,-72(11) /* restore gp registers */
+_GLOBAL(_restgpr_15_x)
+_GLOBAL(_rest32gpr_15_x)
+ lwz 15,-68(11)
+_GLOBAL(_restgpr_16_x)
+_GLOBAL(_rest32gpr_16_x)
+ lwz 16,-64(11)
+_GLOBAL(_restgpr_17_x)
+_GLOBAL(_rest32gpr_17_x)
+ lwz 17,-60(11)
+_GLOBAL(_restgpr_18_x)
+_GLOBAL(_rest32gpr_18_x)
+ lwz 18,-56(11)
+_GLOBAL(_restgpr_19_x)
+_GLOBAL(_rest32gpr_19_x)
+ lwz 19,-52(11)
+_GLOBAL(_restgpr_20_x)
+_GLOBAL(_rest32gpr_20_x)
+ lwz 20,-48(11)
+_GLOBAL(_restgpr_21_x)
+_GLOBAL(_rest32gpr_21_x)
+ lwz 21,-44(11)
+_GLOBAL(_restgpr_22_x)
+_GLOBAL(_rest32gpr_22_x)
+ lwz 22,-40(11)
+_GLOBAL(_restgpr_23_x)
+_GLOBAL(_rest32gpr_23_x)
+ lwz 23,-36(11)
+_GLOBAL(_restgpr_24_x)
+_GLOBAL(_rest32gpr_24_x)
+ lwz 24,-32(11)
+_GLOBAL(_restgpr_25_x)
+_GLOBAL(_rest32gpr_25_x)
+ lwz 25,-28(11)
+_GLOBAL(_restgpr_26_x)
+_GLOBAL(_rest32gpr_26_x)
+ lwz 26,-24(11)
+_GLOBAL(_restgpr_27_x)
+_GLOBAL(_rest32gpr_27_x)
+ lwz 27,-20(11)
+_GLOBAL(_restgpr_28_x)
+_GLOBAL(_rest32gpr_28_x)
+ lwz 28,-16(11)
+_GLOBAL(_restgpr_29_x)
+_GLOBAL(_rest32gpr_29_x)
+ lwz 29,-12(11)
+_GLOBAL(_restgpr_30_x)
+_GLOBAL(_rest32gpr_30_x)
+ lwz 30,-8(11)
+_GLOBAL(_restgpr_31_x)
+_GLOBAL(_rest32gpr_31_x)
+ lwz 0,4(11)
+ lwz 31,-4(11)
+ mtlr 0
+ mr 1,11
+ blr
+
+/* This is from linux-2.6/arch/powerpc/kernel/misc_32.S
+ *
+ * This file contains miscellaneous low-level functions.
+ * Copyright (C) 1995-1996 Gary Thomas (gdt at linuxppc.org)
+ *
+ * Largely rewritten by Cort Dougan (cort at cs.nmt.edu)
+ * and Paul Mackerras.
+ *
+ * kexec bits:
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm at xmission.com>
+ * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
+ *
+ * This program 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 of the License, or (at your option) any later version.
+ *
+ */
+
+_GLOBAL(__lshrdi3)
+ subfic 6,5,32
+ srw 4,4,5 # LSW = count > 31 ? 0 : LSW >> count
+ addi 7,5,32 # could be xori, or addi with -32
+ slw 6,3,6 # t1 = count > 31 ? 0 : MSW << (32-count)
+ srw 7,3,7 # t2 = count < 32 ? 0 : MSW >> (count-32)
+ or 4,4,6 # LSW |= t1
+ srw 3,3,5 # MSW = MSW >> count
+ or 4,4,7 # LSW |= t2
+ blr
+#endif
+#endif
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