diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/vdso | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/vdso')
-rw-r--r-- | arch/arm/vdso/.gitignore | 4 | ||||
-rw-r--r-- | arch/arm/vdso/Makefile | 91 | ||||
-rw-r--r-- | arch/arm/vdso/datapage.S | 16 | ||||
-rw-r--r-- | arch/arm/vdso/note.c | 15 | ||||
-rw-r--r-- | arch/arm/vdso/vdso.S | 23 | ||||
-rw-r--r-- | arch/arm/vdso/vdso.lds.S | 78 | ||||
-rw-r--r-- | arch/arm/vdso/vdsomunge.c | 207 | ||||
-rw-r--r-- | arch/arm/vdso/vgettimeofday.c | 46 |
8 files changed, 480 insertions, 0 deletions
diff --git a/arch/arm/vdso/.gitignore b/arch/arm/vdso/.gitignore new file mode 100644 index 000000000..dfa06f536 --- /dev/null +++ b/arch/arm/vdso/.gitignore @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only +vdso.lds +vdso.so.raw +vdsomunge diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile new file mode 100644 index 000000000..8ca1c9f26 --- /dev/null +++ b/arch/arm/vdso/Makefile @@ -0,0 +1,91 @@ +# SPDX-License-Identifier: GPL-2.0 + +# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before +# the inclusion of generic Makefile. +ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32 +include $(srctree)/lib/vdso/Makefile + +hostprogs := vdsomunge + +obj-vdso := vgettimeofday.o datapage.o note.o + +# Build rules +targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds +obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) + +ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector +ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32 + +ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 +ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ + -z max-page-size=4096 -shared $(ldflags-y) \ + --hash-style=sysv --build-id=sha1 \ + -T + +obj-$(CONFIG_VDSO) += vdso.o +CPPFLAGS_vdso.lds += -P -C -U$(ARCH) + +CFLAGS_REMOVE_vdso.o = -pg + +# Force -O2 to avoid libgcc dependencies +CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) +ifeq ($(c-gettimeofday-y),) +CFLAGS_vgettimeofday.o = -O2 +else +CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y) +endif + +# Disable gcov profiling for VDSO code +GCOV_PROFILE := n + +# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. +KCOV_INSTRUMENT := n + +KASAN_SANITIZE := n + +# Force dependency +$(obj)/vdso.o : $(obj)/vdso.so + +# Link rule for the .so file +$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE + $(call if_changed,vdsold_and_vdso_check) + +$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE + $(call if_changed,vdsomunge) + +# Strip rule for the .so file +$(obj)/%.so: OBJCOPYFLAGS := -S +$(obj)/%.so: $(obj)/%.so.dbg FORCE + $(call if_changed,objcopy) + +# Actual build commands +quiet_cmd_vdsold_and_vdso_check = LD $@ + cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) + +quiet_cmd_vdsomunge = MUNGE $@ + cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@ + +# +# Install the unstripped copy of vdso.so.dbg. If our toolchain +# supports build-id, install .build-id links as well. +# +# Cribbed from arch/x86/vdso/Makefile. +# +quiet_cmd_vdso_install = INSTALL $< +define cmd_vdso_install + cp $< "$(MODLIB)/vdso/vdso.so"; \ + if readelf -n $< | grep -q 'Build ID'; then \ + buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ + first=`echo $$buildid | cut -b-2`; \ + last=`echo $$buildid | cut -b3-`; \ + mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ + ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ + fi +endef + +$(MODLIB)/vdso: FORCE + @mkdir -p $(MODLIB)/vdso + +PHONY += vdso_install +vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso + $(call cmd,vdso_install) diff --git a/arch/arm/vdso/datapage.S b/arch/arm/vdso/datapage.S new file mode 100644 index 000000000..9cd73b725 --- /dev/null +++ b/arch/arm/vdso/datapage.S @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/asm-offsets.h> + + .align 2 +.L_vdso_data_ptr: + .long _start - . - VDSO_DATA_SIZE + +ENTRY(__get_datapage) + .fnstart + adr r0, .L_vdso_data_ptr + ldr r1, [r0] + add r0, r0, r1 + bx lr + .fnend +ENDPROC(__get_datapage) diff --git a/arch/arm/vdso/note.c b/arch/arm/vdso/note.c new file mode 100644 index 000000000..eff5bf9ef --- /dev/null +++ b/arch/arm/vdso/note.c @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2012-2018 ARM Limited + * + * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text. + * Here we can supply some information useful to userland. + */ + +#include <linux/uts.h> +#include <linux/version.h> +#include <linux/elfnote.h> +#include <linux/build-salt.h> + +ELFNOTE32("Linux", 0, LINUX_VERSION_CODE); +BUILD_SALT; diff --git a/arch/arm/vdso/vdso.S b/arch/arm/vdso/vdso.S new file mode 100644 index 000000000..65f2e6f86 --- /dev/null +++ b/arch/arm/vdso/vdso.S @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Adapted from arm64 version. + * + * Copyright (C) 2012 ARM Limited + * + * Author: Will Deacon <will.deacon@arm.com> + */ + +#include <linux/init.h> +#include <linux/linkage.h> +#include <linux/const.h> +#include <asm/page.h> + + .globl vdso_start, vdso_end + .section .data..ro_after_init + .balign PAGE_SIZE +vdso_start: + .incbin "arch/arm/vdso/vdso.so" + .balign PAGE_SIZE +vdso_end: + + .previous diff --git a/arch/arm/vdso/vdso.lds.S b/arch/arm/vdso/vdso.lds.S new file mode 100644 index 000000000..165d1d2eb --- /dev/null +++ b/arch/arm/vdso/vdso.lds.S @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Adapted from arm64 version. + * + * GNU linker script for the VDSO library. + * + * Copyright (C) 2012 ARM Limited + * + * 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-littlearm", "elf32-bigarm", "elf32-littlearm") +OUTPUT_ARCH(arm) + +SECTIONS +{ + PROVIDE(_start = .); + + . = 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 + + + .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr + .eh_frame : { KEEP (*(.eh_frame)) } :text + + .dynamic : { *(.dynamic) } :text :dynamic + + .rodata : { *(.rodata*) } :text + + .text : { *(.text*) } :text =0xe7f001f2 + + .got : { *(.got) } + .rel.plt : { *(.rel.plt) } + + /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; +} + +VERSION +{ + LINUX_2.6 { + global: + __vdso_clock_gettime; + __vdso_gettimeofday; + __vdso_clock_getres; + __vdso_clock_gettime64; + local: *; + }; +} diff --git a/arch/arm/vdso/vdsomunge.c b/arch/arm/vdso/vdsomunge.c new file mode 100644 index 000000000..1977869d8 --- /dev/null +++ b/arch/arm/vdso/vdsomunge.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2015 Mentor Graphics Corporation. + * + * vdsomunge - Host program which produces a shared object + * architecturally specified to be usable by both soft- and hard-float + * programs. + * + * The Procedure Call Standard for the ARM Architecture (ARM IHI + * 0042E) says: + * + * 6.4.1 VFP and Base Standard Compatibility + * + * Code compiled for the VFP calling standard is compatible with + * the base standard (and vice-versa) if no floating-point or + * containerized vector arguments or results are used. + * + * And ELF for the ARM Architecture (ARM IHI 0044E) (Table 4-2) says: + * + * If both EF_ARM_ABI_FLOAT_XXXX bits are clear, conformance to the + * base procedure-call standard is implied. + * + * The VDSO is built with -msoft-float, as with the rest of the ARM + * kernel, and uses no floating point arguments or results. The build + * process will produce a shared object that may or may not have the + * EF_ARM_ABI_FLOAT_SOFT flag set (it seems to depend on the binutils + * version; binutils starting with 2.24 appears to set it). The + * EF_ARM_ABI_FLOAT_HARD flag should definitely not be set, and this + * program will error out if it is. + * + * If the soft-float flag is set, this program clears it. That's all + * it does. + */ + +#include <elf.h> +#include <errno.h> +#include <fcntl.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#define swab16(x) \ + ((((x) & 0x00ff) << 8) | \ + (((x) & 0xff00) >> 8)) + +#define swab32(x) \ + ((((x) & 0x000000ff) << 24) | \ + (((x) & 0x0000ff00) << 8) | \ + (((x) & 0x00ff0000) >> 8) | \ + (((x) & 0xff000000) >> 24)) + +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ +#define HOST_ORDER ELFDATA2LSB +#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ +#define HOST_ORDER ELFDATA2MSB +#endif + +/* Some of the ELF constants we'd like to use were added to <elf.h> + * relatively recently. + */ +#ifndef EF_ARM_EABI_VER5 +#define EF_ARM_EABI_VER5 0x05000000 +#endif + +#ifndef EF_ARM_ABI_FLOAT_SOFT +#define EF_ARM_ABI_FLOAT_SOFT 0x200 +#endif + +#ifndef EF_ARM_ABI_FLOAT_HARD +#define EF_ARM_ABI_FLOAT_HARD 0x400 +#endif + +static int failed; +static const char *argv0; +static const char *outfile; + +static void fail(const char *fmt, ...) +{ + va_list ap; + + failed = 1; + fprintf(stderr, "%s: ", argv0); + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + exit(EXIT_FAILURE); +} + +static void cleanup(void) +{ + if (failed && outfile != NULL) + unlink(outfile); +} + +static Elf32_Word read_elf_word(Elf32_Word word, bool swap) +{ + return swap ? swab32(word) : word; +} + +static Elf32_Half read_elf_half(Elf32_Half half, bool swap) +{ + return swap ? swab16(half) : half; +} + +static void write_elf_word(Elf32_Word val, Elf32_Word *dst, bool swap) +{ + *dst = swap ? swab32(val) : val; +} + +int main(int argc, char **argv) +{ + const Elf32_Ehdr *inhdr; + bool clear_soft_float; + const char *infile; + Elf32_Word e_flags; + const void *inbuf; + struct stat stat; + void *outbuf; + bool swap; + int outfd; + int infd; + + atexit(cleanup); + argv0 = argv[0]; + + if (argc != 3) + fail("Usage: %s [infile] [outfile]\n", argv[0]); + + infile = argv[1]; + outfile = argv[2]; + + infd = open(infile, O_RDONLY); + if (infd < 0) + fail("Cannot open %s: %s\n", infile, strerror(errno)); + + if (fstat(infd, &stat) != 0) + fail("Failed stat for %s: %s\n", infile, strerror(errno)); + + inbuf = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, infd, 0); + if (inbuf == MAP_FAILED) + fail("Failed to map %s: %s\n", infile, strerror(errno)); + + close(infd); + + inhdr = inbuf; + + if (memcmp(&inhdr->e_ident, ELFMAG, SELFMAG) != 0) + fail("Not an ELF file\n"); + + if (inhdr->e_ident[EI_CLASS] != ELFCLASS32) + fail("Unsupported ELF class\n"); + + swap = inhdr->e_ident[EI_DATA] != HOST_ORDER; + + if (read_elf_half(inhdr->e_type, swap) != ET_DYN) + fail("Not a shared object\n"); + + if (read_elf_half(inhdr->e_machine, swap) != EM_ARM) + fail("Unsupported architecture %#x\n", inhdr->e_machine); + + e_flags = read_elf_word(inhdr->e_flags, swap); + + if (EF_ARM_EABI_VERSION(e_flags) != EF_ARM_EABI_VER5) { + fail("Unsupported EABI version %#x\n", + EF_ARM_EABI_VERSION(e_flags)); + } + + if (e_flags & EF_ARM_ABI_FLOAT_HARD) + fail("Unexpected hard-float flag set in e_flags\n"); + + clear_soft_float = !!(e_flags & EF_ARM_ABI_FLOAT_SOFT); + + outfd = open(outfile, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); + if (outfd < 0) + fail("Cannot open %s: %s\n", outfile, strerror(errno)); + + if (ftruncate(outfd, stat.st_size) != 0) + fail("Cannot truncate %s: %s\n", outfile, strerror(errno)); + + outbuf = mmap(NULL, stat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, + outfd, 0); + if (outbuf == MAP_FAILED) + fail("Failed to map %s: %s\n", outfile, strerror(errno)); + + close(outfd); + + memcpy(outbuf, inbuf, stat.st_size); + + if (clear_soft_float) { + Elf32_Ehdr *outhdr; + + outhdr = outbuf; + e_flags &= ~EF_ARM_ABI_FLOAT_SOFT; + write_elf_word(e_flags, &outhdr->e_flags, swap); + } + + if (msync(outbuf, stat.st_size, MS_SYNC) != 0) + fail("Failed to sync %s: %s\n", outfile, strerror(errno)); + + return EXIT_SUCCESS; +} diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c new file mode 100644 index 000000000..1976c6f32 --- /dev/null +++ b/arch/arm/vdso/vgettimeofday.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ARM userspace implementations of gettimeofday() and similar. + * + * Copyright 2015 Mentor Graphics Corporation. + */ +#include <linux/time.h> +#include <linux/types.h> + +int __vdso_clock_gettime(clockid_t clock, + struct old_timespec32 *ts) +{ + return __cvdso_clock_gettime32(clock, ts); +} + +int __vdso_clock_gettime64(clockid_t clock, + struct __kernel_timespec *ts) +{ + return __cvdso_clock_gettime(clock, ts); +} + +int __vdso_gettimeofday(struct __kernel_old_timeval *tv, + struct timezone *tz) +{ + return __cvdso_gettimeofday(tv, tz); +} + +int __vdso_clock_getres(clockid_t clock_id, + struct old_timespec32 *res) +{ + return __cvdso_clock_getres_time32(clock_id, res); +} + +/* Avoid unresolved references emitted by GCC */ + +void __aeabi_unwind_cpp_pr0(void) +{ +} + +void __aeabi_unwind_cpp_pr1(void) +{ +} + +void __aeabi_unwind_cpp_pr2(void) +{ +} |