TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARC: Adjustments for gcc 4.8

Browse Source 
* DWARF unwinder related
  + Force DWARF2 compliant .debug_frame (gcc 4.8 defaults to DWARF4
    which kernel unwinder can't grok).
  + Discard the additional .eh_frame generated
  + Discard the dwarf4 debug info generated by -gdwarf-2 for normal
    no debug case

* 4.8 already uses arc600 multilibs for -mno-mpy

* switch to using uclibc compiler (to get -mmedium-calls and -mno-sdata)
  and also since buildroot can only use 1 toolchain

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta
2013-05-25 14:03:25 +05:30
parent 05b016ecf5
commit 5a45da02cf
5 changed files with 35 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arc/Makefile
+16 -8
View File
@@ -9,7 +9,7 @@
UTS_MACHINE := arc UTS_MACHINE := arc
ifeq ($(CROSS_COMPILE),) ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE := arc-elf32- CROSS_COMPILE := arc-linux-uclibc-
endif endif
KBUILD_DEFCONFIG := fpga_defconfig KBUILD_DEFCONFIG := fpga_defconfig
@@ -25,7 +25,11 @@ ifdef CONFIG_ARC_CURR_IN_REG
LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
endif endif
atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y) upto_gcc42 := $(call cc-ifversion, -le, 0402, y)
upto_gcc44 := $(call cc-ifversion, -le, 0404, y)
atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y)
atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y)
cflags-$(atleast_gcc44) += -fsection-anchors cflags-$(atleast_gcc44) += -fsection-anchors
cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
@@ -33,6 +37,11 @@ cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
ifeq ($(atleast_gcc48),y)
cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2
endif
ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
# Generic build system uses -O2, we want -O3 # Generic build system uses -O2, we want -O3
cflags-y += -O3 cflags-y += -O3
@@ -46,11 +55,10 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
# STAR 9000518362: # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
# --build-id w/o "-marclinux". # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
# Default arc-elf32-ld is OK ldflags-$(upto_gcc44) += -marclinux
ldflags-y += -marclinux
ARC_LIBGCC := -mA7 ARC_LIBGCC := -mA7
cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16 cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
@@ -64,8 +72,8 @@ ifndef CONFIG_ARC_HAS_HW_MPY
# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments, # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
ARC_LIBGCC := -marc600 ifeq ($(upto_gcc42),y)
ifneq ($(atleast_gcc44),y) ARC_LIBGCC := -marc600
cflags-y += -multcost=30 cflags-y += -multcost=30
endif endif
endif endif
arch/arc/configs/fpga_defconfig
+1 -1
View File
@@ -1,4 +1,4 @@
CONFIG_CROSS_COMPILE="arc-elf32-" CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
# CONFIG_LOCALVERSION_AUTO is not set # CONFIG_LOCALVERSION_AUTO is not set
CONFIG_DEFAULT_HOSTNAME="ARCLinux" CONFIG_DEFAULT_HOSTNAME="ARCLinux"
# CONFIG_SWAP is not set # CONFIG_SWAP is not set
arch/arc/configs/nsimosci_defconfig
+1 -1
View File
@@ -1,4 +1,4 @@
CONFIG_CROSS_COMPILE="arc-elf32-" CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
# CONFIG_LOCALVERSION_AUTO is not set # CONFIG_LOCALVERSION_AUTO is not set
CONFIG_DEFAULT_HOSTNAME="ARCLinux" CONFIG_DEFAULT_HOSTNAME="ARCLinux"
# CONFIG_SWAP is not set # CONFIG_SWAP is not set
arch/arc/configs/tb10x_defconfig
+1 -1
View File
@@ -1,4 +1,4 @@
CONFIG_CROSS_COMPILE="arc-elf32-" CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
# CONFIG_LOCALVERSION_AUTO is not set # CONFIG_LOCALVERSION_AUTO is not set
CONFIG_DEFAULT_HOSTNAME="tb10x" CONFIG_DEFAULT_HOSTNAME="tb10x"
CONFIG_SYSVIPC=y CONFIG_SYSVIPC=y
arch/arc/kernel/vmlinux.lds.S
+16 -8
View File
@@ -125,6 +125,11 @@ SECTIONS
*(.debug_frame) *(.debug_frame)
__end_unwind = .; __end_unwind = .;
} }
/*
* gcc 4.8 generates this for -fasynchonous-unwind-tables,
* while we still use the .debug_frame based unwinder
*/
/DISCARD/ : { *(.eh_frame) }
#else #else
/DISCARD/ : { *(.debug_frame) } /DISCARD/ : { *(.debug_frame) }
#endif #endif
@@ -142,15 +147,18 @@ SECTIONS
*(.arcextmap.*) *(.arcextmap.*)
} }
#ifndef CONFIG_DEBUG_INFO
/* open-coded because we need .debug_frame seperately for unwinding */ /* open-coded because we need .debug_frame seperately for unwinding */
.debug_aranges 0 : { *(.debug_aranges) } /DISCARD/ : { *(.debug_aranges) }
.debug_pubnames 0 : { *(.debug_pubnames) } /DISCARD/ : { *(.debug_pubnames) }
.debug_info 0 : { *(.debug_info) } /DISCARD/ : { *(.debug_info) }
.debug_abbrev 0 : { *(.debug_abbrev) } /DISCARD/ : { *(.debug_abbrev) }
.debug_line 0 : { *(.debug_line) } /DISCARD/ : { *(.debug_line) }
.debug_str 0 : { *(.debug_str) } /DISCARD/ : { *(.debug_str) }
.debug_loc 0 : { *(.debug_loc) } /DISCARD/ : { *(.debug_loc) }
.debug_macinfo 0 : { *(.debug_macinfo) } /DISCARD/ : { *(.debug_macinfo) }
/DISCARD/ : { *(.debug_ranges) }
#endif
#ifdef CONFIG_ARC_HAS_DCCM #ifdef CONFIG_ARC_HAS_DCCM
. = CONFIG_ARC_DCCM_BASE; . = CONFIG_ARC_DCCM_BASE;