diff options
Diffstat (limited to 'arch/arm64/kernel/vdso-ilp32')
| -rw-r--r-- | arch/arm64/kernel/vdso-ilp32/.gitignore | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/vdso-ilp32/Makefile | 72 | ||||
| -rw-r--r-- | arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S | 33 | ||||
| -rw-r--r-- | arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S | 98 |
4 files changed, 205 insertions, 0 deletions
diff --git a/arch/arm64/kernel/vdso-ilp32/.gitignore b/arch/arm64/kernel/vdso-ilp32/.gitignore new file mode 100644 index 000000000000..61806c3fd68b --- /dev/null +++ b/arch/arm64/kernel/vdso-ilp32/.gitignore @@ -0,0 +1,2 @@ +vdso-ilp32.lds +vdso-ilp32-offsets.h diff --git a/arch/arm64/kernel/vdso-ilp32/Makefile b/arch/arm64/kernel/vdso-ilp32/Makefile new file mode 100644 index 000000000000..c8f54727fbb2 --- /dev/null +++ b/arch/arm64/kernel/vdso-ilp32/Makefile @@ -0,0 +1,72 @@ +# +# Building a vDSO image for AArch64. +# +# Author: Will Deacon <will.deacon@arm.com> +# Heavily based on the vDSO Makefiles for other archs. +# + +obj-ilp32-vdso := gettimeofday-ilp32.o note-ilp32.o sigreturn-ilp32.o + +# Build rules +targets := $(obj-ilp32-vdso) vdso-ilp32.so vdso-ilp32.so.dbg +obj-ilp32-vdso := $(addprefix $(obj)/, $(obj-ilp32-vdso)) + +ccflags-y := -shared -fno-common -fno-builtin +ccflags-y += -nostdlib -Wl,-soname=linux-ilp32-vdso.so.1 \ + $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) + +obj-y += vdso-ilp32.o +extra-y += vdso-ilp32.lds vdso-ilp32-offsets.h +CPPFLAGS_vdso-ilp32.lds += -P -C -U$(ARCH) -mabi=ilp32 + +# Force dependency (incbin is bad) +$(obj)/vdso-ilp32.o : $(obj)/vdso-ilp32.so + +# Link rule for the .so file, .lds has to be first +$(obj)/vdso-ilp32.so.dbg: $(src)/vdso-ilp32.lds $(obj-ilp32-vdso) + $(call if_changed,vdso-ilp32ld) + +# Strip rule for the .so file +$(obj)/%.so: OBJCOPYFLAGS := -S +$(obj)/%.so: $(obj)/%.so.dbg FORCE + $(call if_changed,objcopy) + +# Generate VDSO offsets using helper script +gen-vdsosym := $(srctree)/$(src)/../vdso/gen_vdso_offsets.sh +quiet_cmd_vdsosym = VDSOSYM $@ +define cmd_vdsosym + $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ && \ + cp $@ include/generated/ +endef + +$(obj)/vdso-ilp32-offsets.h: $(obj)/vdso-ilp32.so.dbg FORCE + $(call if_changed,vdsosym) + +# Assembly rules for the .S files +#$(obj-ilp32-vdso): %.o: $(src)/../vdso/$(subst -ilp32,,%.S) +# $(call if_changed_dep,vdso-ilp32as) + +$(obj)/gettimeofday-ilp32.o: $(src)/../vdso/gettimeofday.S + $(call if_changed_dep,vdso-ilp32as) + +$(obj)/note-ilp32.o: $(src)/../vdso/note.S + $(call if_changed_dep,vdso-ilp32as) + +$(obj)/sigreturn-ilp32.o: $(src)/../vdso/sigreturn.S + $(call if_changed_dep,vdso-ilp32as) + +# Actual build commands +quiet_cmd_vdso-ilp32ld = VDSOILP32L $@ + cmd_vdso-ilp32ld = $(CC) $(c_flags) -mabi=ilp32 -Wl,-n -Wl,-T $^ -o $@ +quiet_cmd_vdso-ilp32as = VDSOILP32A $@ + cmd_vdso-ilp32as = $(CC) $(a_flags) -mabi=ilp32 -c -o $@ $< + +# Install commands for the unstripped file +quiet_cmd_vdso_install = INSTALL $@ + cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ + +vdso-ilp32.so: $(obj)/vdso-ilp32.so.dbg + @mkdir -p $(MODLIB)/vdso + $(call cmd,vdso_install) + +vdso_install: vdso-ilp32.so diff --git a/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S b/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S new file mode 100644 index 000000000000..46ac0728443c --- /dev/null +++ b/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2012 ARM Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Author: Will Deacon <will.deacon@arm.com> + */ + +#include <linux/init.h> +#include <linux/linkage.h> +#include <linux/const.h> +#include <asm/page.h> + + __PAGE_ALIGNED_DATA + + .globl vdso_ilp32_start, vdso_ilp32_end + .balign PAGE_SIZE +vdso_ilp32_start: + .incbin "arch/arm64/kernel/vdso-ilp32/vdso-ilp32.so" + .balign PAGE_SIZE +vdso_ilp32_end: + + .previous diff --git a/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S b/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S new file mode 100644 index 000000000000..ac8029bb03c8 --- /dev/null +++ b/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S @@ -0,0 +1,98 @@ +/* + * GNU linker script for the VDSO library. + * + * Copyright (C) 2012 ARM Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Author: Will Deacon <will.deacon@arm.com> + * Heavily based on the vDSO linker scripts for other archs. + */ + +#include <linux/const.h> +#include <asm/page.h> +#include <asm/vdso.h> + +/*OUTPUT_FORMAT("elf32-littleaarch64", "elf32-bigaarch64", "elf32-littleaarch64") +OUTPUT_ARCH(aarch64) +*/ +SECTIONS +{ + PROVIDE(_vdso_data = . - PAGE_SIZE); + . = VDSO_LBASE + SIZEOF_HEADERS; + + .hash : { *(.hash) } :text + .gnu.hash : { *(.gnu.hash) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .gnu.version_r : { *(.gnu.version_r) } + + .note : { *(.note.*) } :text :note + + . = ALIGN(16); + + .text : { *(.text*) } :text =0xd503201f + PROVIDE (__etext = .); + PROVIDE (_etext = .); + PROVIDE (etext = .); + + .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr + .eh_frame : { KEEP (*(.eh_frame)) } :text + + .dynamic : { *(.dynamic) } :text :dynamic + + .rodata : { *(.rodata*) } :text + + _end = .; + PROVIDE(end = .); + + /DISCARD/ : { + *(.note.GNU-stack) + *(.data .data.* .gnu.linkonce.d.* .sdata*) + *(.bss .sbss .dynbss .dynsbss) + } +} + +/* + * We must supply the ELF program headers explicitly to get just one + * PT_LOAD segment, and set the flags explicitly to make segments read-only. + */ +PHDRS +{ + text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ + dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ + note PT_NOTE FLAGS(4); /* PF_R */ + eh_frame_hdr PT_GNU_EH_FRAME; +} + +/* + * This controls what symbols we export from the DSO. + */ +VERSION +{ + LINUX_2.6.39 { + global: + __kernel_rt_sigreturn; + __kernel_gettimeofday; + __kernel_clock_gettime; + __kernel_clock_getres; + local: *; + }; +} + +/* + * Make the sigreturn code visible to the kernel. + */ +VDSO_sigtramp_ilp32 = __kernel_rt_sigreturn; |