[U-Boot] [PATCH 0/5] Optimize ARM relocation

Albert ARIBAUD
2013-05-14T20:02:55Z

*** NOTE: this series applies over the 'Factorize
ARM relocate_code instances' series.

This series optimizes relocation by ensuring ARM
binaries only use one type of relocation record,
R_ARM_RELATIVE., then optimizing relocation code
accordingly.

The only known case where relocation records other
than R_ARM_RELATIVE are generated is when a reference
is made to a symbol defined in the linker script, e.g.
__image_copy_start, __image_copy_end, __rel_dyn_start,
__rel_dyn_end, and __dynsym_start.

Moving the definition of these symbols from the linker
scripts into a C module causes their references' types
to become R_ARM_RELATIVE.

First, arch/arm/lib/bss.c is replaced by a more generic
arch/arm/lib/sections.c where all section symbols will
be defined.

Second, __image_copy_start and __image_copy_end symbols
are moved from linker scripts to arch/arm/lib/sections.c

Third, __rel_dyn_start, __rel_dyn_end and __synsym_start
are moved from linker scripts into arch/arm/lib/sections.c

Fourth, a check is added to the build system to ensure
that ELF U-Boot binaries only use R_ARM_RELATIVE records.

Last, relocate_code is optimized

Albert ARIBAUD (5):
arm: generalize lib/bss.c into lib/sections.c
arm: make __image_copy_{start,end} compiler-generated
arm: make relocation symbols compiler-generated
arm: ensure u-boot only uses relative relocations
arm: optimize relocate_code routine

Makefile | 7 ++++
arch/arm/config.mk | 5 +++
arch/arm/cpu/arm920t/ep93xx/u-boot.lds | 6 ++-
arch/arm/cpu/ixp/u-boot.lds | 24 ++++++++++--
arch/arm/cpu/u-boot.lds | 25 ++++++++++---
arch/arm/lib/Makefile | 2 +-
arch/arm/lib/relocate.S | 64 +++++++++-----------------------
arch/arm/lib/{bss.c => sections.c} | 9 ++++-
board/actux1/u-boot.lds | 24 ++++++++++--
board/actux2/u-boot.lds | 24 ++++++++++--
board/actux3/u-boot.lds | 24 ++++++++++--
board/dvlhost/u-boot.lds | 24 ++++++++++--
board/freescale/mx31ads/u-boot.lds | 24 ++++++++++--
13 files changed, 183 insertions(+), 79 deletions(-)
rename arch/arm/lib/{bss.c => sections.c} (77%)

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1.7.10.4