mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-28 09:38:53 +00:00
95 lines
3.9 KiB
Diff
95 lines
3.9 KiB
Diff
ARM: link bootstrap as ET_REL not ET_EXEC
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From: Frank Mehnert <frank.mehnert@kernkonzept.com>
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Support for linking of ET_EXEC section was deprecated in binutils 2.35
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and dropped in binutils 2.36.
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Instead, extract the raw section of the fully linked bootstrap object
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and create a relocatable object which can be linked to the kernel. The
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required symbols for the linker are extracted separately.
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Fixes ticket #CD-301.
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Change-Id: I0cdc2aacb5dbd01677d93e2bb1103940ac60e848
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Edit: fixed merge error for Genode
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---
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src/Makeconf.arm | 6 ++++++
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src/kern/arm/Makerules.KERNEL | 20 ++++++++++++++++----
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src/kernel.arm.ld | 4 ++--
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3 files changed, 24 insertions(+), 6 deletions(-)
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diff --git a/src/Makeconf.arm b/src/Makeconf.arm
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index 7c66a8d..89b9e7d 100644
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--- a/src/Makeconf.arm
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+++ b/src/Makeconf.arm
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@@ -31,3 +31,9 @@ LDFLAGS += $(LDFLAGS-y)
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LD_EMULATION_CHOICE-$(CONFIG_BIT32) := armelf armelf_linux_eabi armelf_fbsd
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LD_EMULATION_CHOICE-$(CONFIG_BIT64) := aarch64linux aarch64elf
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LD_EMULATION_CHOICE := $(LD_EMULATION_CHOICE-y)
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+OBJCOPY_BFDNAME-$(CONFIG_BIT32) := elf32-littlearm
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+OBJCOPY_BFDNAME-$(CONFIG_BIT64) := elf64-littleaarch64
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+OBJCOPY_BFDNAME := $(OBJCOPY_BFDNAME-y)
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+OBJCOPY_BFDARCH-$(CONFIG_BIT32) := arm
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+OBJCOPY_BFDARCH-$(CONFIG_BIT64) := aarch64
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+OBJCOPY_BFDARCH := $(OBJCOPY_BFDARCH-y)
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diff --git a/src/kern/arm/Makerules.KERNEL b/src/kern/arm/Makerules.KERNEL
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index d706444..fae3013 100644
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--- a/src/kern/arm/Makerules.KERNEL
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+++ b/src/kern/arm/Makerules.KERNEL
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@@ -21,16 +21,28 @@ bootstrap_ldflags += -T$(bootstrap_lds)
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bootstrap_export = _start start_of_loader end_of_bootstrap_info
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bootstrap_strip = --strip-all $(addprefix --keep-symbol=,$(bootstrap_export))
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+bootstrap_syms = end_of_bootstrap_info|_start|start_of_loader
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+bootstrap_sed = 's/^0*([0-9a-f]*) [a-zA-Z] ($(bootstrap_syms))/\2 = 0x\1;/p'
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bootstrap.$(KERNEL).pre.o: $(OBJ_BOOTSTRAP) $(LIBGCC) $(bootstrap_lds)
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$(LINK_MESSAGE)
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$(VERBOSE)$(LD) $(bootstrap_ldflags) $(OBJ_BOOTSTRAP) $(LIBGCC) -o $@
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-bootstrap.$(KERNEL).o: bootstrap.$(KERNEL).pre.o
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- $(LINK_MESSAGE)
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- $(VERBOSE)$(OBJCOPY) $(bootstrap_strip) $< $@
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+bootstrap.$(KERNEL).bin: bootstrap.$(KERNEL).pre.o
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+ $(COMP_MESSAGE)
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+ $(VERBOSE)$(OBJCOPY) -O binary --only-section=.bootstrap.text $< $@
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+
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+bootstrap.$(KERNEL).rel: bootstrap.$(KERNEL).bin
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+ $(COMP_MESSAGE)
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+ $(VERBOSE)$(OBJCOPY) -I binary -O $(OBJCOPY_BFDNAME) -B $(OBJCOPY_BFDARCH) \
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+ --rename-section .data=.bootstrap.text $< $@
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+
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+# The linker will treat this file as linker script.
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+bootstrap.$(KERNEL).sym: bootstrap.$(KERNEL).pre.o
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+ $(COMP_MESSAGE)
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+ $(VERBOSE)$(NM) $< | sed -n -E $(bootstrap_sed) > $@
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-$(KERNEL).image: kernel.arm.lds $(CRT0) bootstrap.$(KERNEL).o $(OBJ_KERNEL_noboot) $(JDB) $(LIBK) $(KERNEL_EXTRA_LIBS) $(LIBDISASM) $(ABI) libdrivers.a $(LIBUART) $(CXXLIB) $(MINILIBC) $(LIBGCC) $(MINILIBC) libgluedriverslibc.a
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+$(KERNEL).image: kernel.arm.lds $(CRT0) bootstrap.$(KERNEL).rel bootstrap.$(KERNEL).sym $(OBJ_KERNEL_noboot) $(JDB) $(LIBK) $(KERNEL_EXTRA_LIBS) $(LIBDISASM) $(ABI) libdrivers.a $(LIBUART) $(CXXLIB) $(MINILIBC) $(LIBGCC) $(MINILIBC) libgluedriverslibc.a
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$(LINK_MESSAGE)
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$(VERBOSE)$(LD) $(LDFLAGS) -m $(LD_EMULATION) $(KERNEL_LDFLAGS) -N -defsym kernel_load_addr=$(CONFIG_KERNEL_LOAD_ADDR) \
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-T $< -o $@ $(filter-out $<,$+)
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diff --git a/src/kernel.arm.ld b/src/kernel.arm.ld
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index 1e3ec75..86c16b3 100644
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--- a/src/kernel.arm.ld
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+++ b/src/kernel.arm.ld
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@@ -61,14 +61,14 @@ SECTIONS {
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. = kernel_load_addr + 0x1000;
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- .text : {
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+ .text kernel_load_addr + 0x1000 : {
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MWORD(_start_kernel)
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MWORD(my_kernel_info_page)
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KEEP(*(.bootstrap.info))
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ASSERT (ABSOLUTE(.) == end_of_bootstrap_info, "invalid size of bootstrap.info");
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. = ABSOLUTE(start_of_loader);
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- *(.bootstrap.text)
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+ KEEP(*(.bootstrap.text))
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} :bstrap
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. = ALIGN(4K);
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