Hello,
it seems that the -mcmodel=small was not the right default for RTEMS
applications, since I get
relocation truncated to fit: R_PPC64_TOC16_DS against `.got'+118
errors quite quickly.
So, I try to add the -mcmodel option. However, some piece is missing:
/build/git-build/b-gcc-git-powerpc-rtems4.12/./gcc/xgcc
-B/build/git-build/b-gcc-git-powerpc-rtems4.12/./gcc/ -nostdinc
-B/build/git-build/b-gcc-git-powerpc-rtems4.12/powerpc-rtems4.12/me6500/m64/newlib/
-isystem
/build/git-build/b-gcc-git-powerpc-rtems4.12/powerpc-rtems4.12/me6500/m64/newlib/targ-include
-isystem /home/EB/sebastian_h/archive/gcc-git/newlib/libc/include
-B/opt/rtems-4.12/powerpc-rtems4.12/bin/
-B/opt/rtems-4.12/powerpc-rtems4.12/lib/ -isystem
/opt/rtems-4.12/powerpc-rtems4.12/include -isystem
/opt/rtems-4.12/powerpc-rtems4.12/sys-include -mcpu=e6500 -m64 -g -O2
-O2 -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -W -Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -isystem ./include -I. -I.
-I../../../.././gcc -I/home/EB/sebastian_h/archive/gcc-git/libgcc
-I/home/EB/sebastian_h/archive/gcc-git/libgcc/.
-I/home/EB/sebastian_h/archive/gcc-git/libgcc/../gcc
-I/home/EB/sebastian_h/archive/gcc-git/libgcc/../include -g0
-finhibit-size-directive -fno-inline -fno-exceptions
-fno-zero-initialized-in-bss -fno-toplevel-reorder -fno-tree-vectorize
-fbuilding-libgcc -fno-stack-protector -Dinhibit_libc -I. -I.
-I../../../.././gcc -I/home/EB/sebastian_h/archive/gcc-git/libgcc
-I/home/EB/sebastian_h/archive/gcc-git/libgcc/.
-I/home/EB/sebastian_h/archive/gcc-git/libgcc/../gcc
-I/home/EB/sebastian_h/archive/gcc-git/libgcc/../include -o crtbeginS.o
-MT crtbeginS.o -MD -MP -MF crtbeginS.dep -msdata=none -O2 -c
/home/EB/sebastian_h/archive/gcc-git/libgcc/crtstuff.c -DCRT_BEGIN
-DCRTSTUFFS_O -fPIC -mcmodel=medium -save-temps
crtstuff.s: Assembler messages:
crtstuff.s:44: Error: can't resolve `.tm_clone_table' {.tm_clone_table
section} - `.LCTOC1' {.toc1 section}
crtstuff.s:45: Error: can't resolve `__TMC_END__' {*UND* section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:82: Error: can't resolve `.tm_clone_table' {.tm_clone_table
section} - `.LCTOC1' {.toc1 section}
crtstuff.s:83: Error: can't resolve `__TMC_END__' {*UND* section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:131: Error: can't resolve `.bss' {.bss section} - `.LCTOC1'
{.toc1 section}
crtstuff.s:143: Error: can't resolve `__dso_handle' {.sdata section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:149: Error: can't resolve `__DTOR_END__' {*UND* section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:150: Error: can't resolve `.dtors' {.dtors section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:153: Error: can't resolve `.bss' {.bss section} - `.LCTOC1'
{.toc1 section}
crtstuff.s:157: Error: can't resolve `.dtors' {.dtors section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:162: Error: can't resolve `.bss' {.bss section} - `.LCTOC1'
{.toc1 section}
crtstuff.s:185: Error: can't resolve `.eh_frame' {.eh_frame section} -
`.LCTOC1' {.toc1 section}
crtstuff.s:192: Error: can't resolve `.bss' {.bss section} - `.LCTOC1'
{.toc1 section}
crtstuff.s:226: Error: can't resolve `.bss' {.bss section} - `.LCTOC1'
{.toc1 section}
crtstuff.s:227: Error: can't resolve `.eh_frame' {.eh_frame section} -
`.LCTOC1' {.toc1 section}
The code generation works with -mcmodel=small and -mcmodel=large.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.hu...@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>From 7d2b18f303cc7cf62d29328b362e645027884270 Mon Sep 17 00:00:00 2001
From: Sebastian Huber
Date: Fri, 11 Aug 2017 11:26:19 +0200
Subject: [PATCH] PowerPC/RTEMS: Enable -mcmodel option
---
gcc/config.gcc| 2 +-
gcc/config/rs6000/rtems.h | 47 +++
2 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/gcc/config.gcc b/gcc/config.gcc
index a9196cd26d9..593631849bb 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -2416,7 +2416,7 @@ powerpc-*-eabi*)
;;
powerpc-*-rtems*)
tm_file="rs6000/biarch64.h ${tm_file} dbxelf.h elfos.h freebsd-spec.h newlib-stdint.h rs6000/sysv4.h rs6000/e500.h rs6000/rtems.h rtems.h"
- extra_options="${extra_options} rs6000/sysv4.opt"
+ extra_options="${extra_options} rs6000/sysv4.opt rs6000/linux64.opt"
tmake_file="${tmake_file} rs6000/t-fprules rs6000/t-rtems rs6000/t-ppccomm"
;;
powerpc*-*-linux*)
diff --git a/gcc/config/rs6000/rtems.h b/gcc/config/rs6000/rtems.h
index 8a62fdcbaf3..40940c1dfe6 100644
--- a/gcc/config/rs6000/rtems.h
+++ b/gcc/config/rs6000/rtems.h
@@ -37,6 +37,11 @@
#undef TARGET_AIX
#define TARGET_AIX TARGET_64BIT
+/* Copy and paste from linux64.h and freebsd64.h */
+#undef TARGET_CMODEL
+#define TARGET_CMODEL r
