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s390/purgatory: Reduce purgatory size

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The purgatory is compiled into the vmlinux and keept in memory all the time
during runtime. Thus any section not needed to load the purgatory
unnecessarily bloats up its foot print in file- and memorysize. Reduce the
purgatory size by stripping the unneeded sections from the purgatory.

This reduces the purgatories size by ~33%.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Rudo 2019-03-05 17:18:13 +01:00 committed by Martin Schwidefsky
parent 729829d775
commit 61f3f8fc22
2 changed files with 64 additions and 4 deletions
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14
arch/s390/purgatory/Makefile
View File

@ -4,7 +4,7 @@ OBJECT_FILES_NON_STANDARD := y
purgatory-y := head.o purgatory.o string.o sha256.o mem.o
targets += $(purgatory-y) purgatory.ro kexec-purgatory.c
targets += $(purgatory-y) purgatory.lds purgatory purgatory.ro kexec-purgatory.c
PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
$(obj)/sha256.o: $(srctree)/lib/sha256.c FORCE
@ -16,8 +16,6 @@ $(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE
$(obj)/string.o: $(srctree)/arch/s390/lib/string.c FORCE
$(call if_changed_rule,cc_o_c)
LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib
LDFLAGS_purgatory.ro += -z nodefaultlib
KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
@ -25,9 +23,17 @@ KBUILD_CFLAGS += -c -MD -Os -m64 -msoft-float -fno-common
KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
KBUILD_AFLAGS := $(filter-out -DCC_USING_EXPOLINE,$(KBUILD_AFLAGS))
$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
LDFLAGS_purgatory := -r --no-undefined -nostdlib -z nodefaultlib -T
$(obj)/purgatory: $(obj)/purgatory.lds $(PURGATORY_OBJS) FORCE
$(call if_changed,ld)
OBJCOPYFLAGS_purgatory.ro := -O elf64-s390
OBJCOPYFLAGS_purgatory.ro += --remove-section='*debug*'
OBJCOPYFLAGS_purgatory.ro += --remove-section='.comment'
OBJCOPYFLAGS_purgatory.ro += --remove-section='.note.*'
$(obj)/purgatory.ro: $(obj)/purgatory FORCE
$(call if_changed,objcopy)
quiet_cmd_bin2c = BIN2C $@
cmd_bin2c = $(objtree)/scripts/bin2c kexec_purgatory < $< > $@

54
arch/s390/purgatory/purgatory.lds.S Normal file
View File

@ -0,0 +1,54 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <asm-generic/vmlinux.lds.h>
OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
OUTPUT_ARCH(s390:64-bit)
ENTRY(purgatory_start)
SECTIONS
{
. = 0;
.head.text : {
_head = . ;
HEAD_TEXT
_ehead = . ;
}
.text : {
_text = .; /* Text */
*(.text)
*(.text.*)
_etext = . ;
}
.rodata : {
_rodata = . ;
*(.rodata) /* read-only data */
*(.rodata.*)
_erodata = . ;
}
.data : {
_data = . ;
*(.data)
*(.data.*)
_edata = . ;
}
. = ALIGN(256);
.bss : {
_bss = . ;
*(.bss)
*(.bss.*)
*(COMMON)
. = ALIGN(8); /* For convenience during zeroing */
_ebss = .;
}
_end = .;
/* Sections to be discarded */
/DISCARD/ : {
*(.eh_frame)
*(*__ksymtab*)
*(___kcrctab*)
}
}