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85xx: Use gc-sections to reduce image size

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On an XPedite5370 over 11KBytes were saved:
  Before:
       text	   data	    bss	    dec	    hex	filename
   332456	  33364	  33476	 399296	  617c0	./u-boot

  After:
      text	   data	    bss	    dec	    hex	filename
   321075	  33836	  33476	 388387	  5ed23	./u-boot

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Peter Tyser 2010-09-29 14:05:56 -05:00 • committed by Kumar Gala
parent 68337fb5f6
commit fbe53f59bd
2 changed files with 14 additions and 42 deletions
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4
arch/powerpc/cpu/mpc85xx/config.mk
View file

@ -25,6 +25,10 @@ PLATFORM_RELFLAGS += -fPIC -meabi
PLATFORM_CPPFLAGS += -ffixed-r2 -Wa,-me500 -msoft-float -mno-string PLATFORM_CPPFLAGS += -ffixed-r2 -Wa,-me500 -msoft-float -mno-string
# Enable gc-sections to enable generation of smaller images.
PLATFORM_LDFLAGS += --gc-sections
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
# -mspe=yes is needed to have -mno-spe accepted by a buggy GCC; # -mspe=yes is needed to have -mno-spe accepted by a buggy GCC;
# see "[PATCH,rs6000] make -mno-spe work as expected" on # see "[PATCH,rs6000] make -mno-spe work as expected" on
# http://gcc.gnu.org/ml/gcc-patches/2008-04/msg00311.html # http://gcc.gnu.org/ml/gcc-patches/2008-04/msg00311.html

52
arch/powerpc/cpu/mpc85xx/u-boot.lds
View file

@ -25,8 +25,7 @@
#endif #endif
OUTPUT_ARCH(powerpc) OUTPUT_ARCH(powerpc)
/* Do we need any of these for elf?
__DYNAMIC = 0; */
PHDRS PHDRS
{ {
text PT_LOAD; text PT_LOAD;
@ -38,42 +37,16 @@ SECTIONS
/* Read-only sections, merged into text segment: */ /* Read-only sections, merged into text segment: */
. = + SIZEOF_HEADERS; . = + SIZEOF_HEADERS;
.interp : { *(.interp) } .interp : { *(.interp) }
.hash : { *(.hash) }
.dynsym : { *(.dynsym) }
.dynstr : { *(.dynstr) }
.rel.text : { *(.rel.text) }
.rela.text : { *(.rela.text) }
.rel.data : { *(.rel.data) }
.rela.data : { *(.rela.data) }
.rel.rodata : { *(.rel.rodata) }
.rela.rodata : { *(.rela.rodata) }
.rel.got : { *(.rel.got) }
.rela.got : { *(.rela.got) }
.rel.ctors : { *(.rel.ctors) }
.rela.ctors : { *(.rela.ctors) }
.rel.dtors : { *(.rel.dtors) }
.rela.dtors : { *(.rela.dtors) }
.rel.bss : { *(.rel.bss) }
.rela.bss : { *(.rela.bss) }
.rel.plt : { *(.rel.plt) }
.rela.plt : { *(.rela.plt) }
.init : { *(.init) }
.plt : { *(.plt) }
.text : .text :
{ {
*(.text) *(.text*)
*(.got1)
} :text } :text
_etext = .; _etext = .;
PROVIDE (etext = .); PROVIDE (etext = .);
.rodata : .rodata :
{ {
*(.eh_frame)
*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
} :text } :text
.fini : { *(.fini) } =0
.ctors : { *(.ctors) }
.dtors : { *(.dtors) }
/* Read-write section, merged into data segment: */ /* Read-write section, merged into data segment: */
. = (. + 0x00FF) & 0xFFFFFF00; . = (. + 0x00FF) & 0xFFFFFF00;
@ -81,23 +54,19 @@ SECTIONS
PROVIDE (erotext = .); PROVIDE (erotext = .);
.reloc : .reloc :
{ {
*(.got) KEEP(*(.got))
_GOT2_TABLE_ = .; _GOT2_TABLE_ = .;
*(.got2) KEEP(*(.got2))
_FIXUP_TABLE_ = .; _FIXUP_TABLE_ = .;
*(.fixup) KEEP(*(.fixup))
} }
__got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >> 2; __got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >> 2;
__fixup_entries = (. - _FIXUP_TABLE_) >> 2; __fixup_entries = (. - _FIXUP_TABLE_) >> 2;
.data : .data :
{ {
*(.data) *(.data*)
*(.data1) *(.sdata*)
*(.sdata)
*(.sdata2)
*(.dynamic)
CONSTRUCTORS
} }
_edata = .; _edata = .;
PROVIDE (edata = .); PROVIDE (edata = .);
@ -126,7 +95,7 @@ SECTIONS
.resetvec RESET_VECTOR_ADDRESS : .resetvec RESET_VECTOR_ADDRESS :
{ {
*(.resetvec) KEEP(*(.resetvec))
} :text = 0xffff } :text = 0xffff
. = RESET_VECTOR_ADDRESS + 0x4; . = RESET_VECTOR_ADDRESS + 0x4;
@ -145,9 +114,8 @@ SECTIONS
__bss_start = .; __bss_start = .;
.bss (NOLOAD) : .bss (NOLOAD) :
{ {
*(.sbss) *(.scommon) *(.sbss*)
*(.dynbss) *(.bss*)
*(.bss)
*(COMMON) *(COMMON)
} :bss } :bss