From: Andrew Pinski <apinski@cavium.com>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
To: linux-arm-kernel@lists.infradead.org
To: linux-kernel@vger.kernel.org
Cc: Andrew Pinski <apinski@cavium.com>
Subject: [PATCH 19/24] ARM64: Add vdso for ILP32 and use it for the signal return.
Date: Sat, 24 May 2014 00:02:14 -0700 [thread overview]
Message-ID: <1400914939-9708-20-git-send-email-apinski@cavium.com> (raw)
In-Reply-To: <1400914939-9708-1-git-send-email-apinski@cavium.com>
This patch adds the VDSO for ILP32. We need to use a different VDSO than LP64 since ILP32 uses ELF32 while LP64 uses ELF64.
After this patch, signal handling works mostly. In that signals go through their action and then returned correctly.
Thanks,
Andrew Pinski
Signed-off-by: Andrew Pinski <apinski@cavium.com>
---
arch/arm64/include/asm/vdso.h | 4 +
arch/arm64/kernel/Makefile | 5 +
arch/arm64/kernel/signal.c | 4 +
arch/arm64/kernel/vdso-ilp32/.gitignore | 2 +
arch/arm64/kernel/vdso-ilp32/Makefile | 72 ++++++++++++++++++
arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S | 33 ++++++++
arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S | 100 +++++++++++++++++++++++++
arch/arm64/kernel/vdso.c | 53 +++++++++++--
8 files changed, 266 insertions(+), 7 deletions(-)
create mode 100644 arch/arm64/kernel/vdso-ilp32/.gitignore
create mode 100644 arch/arm64/kernel/vdso-ilp32/Makefile
create mode 100644 arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S
create mode 100644 arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S
diff --git a/arch/arm64/include/asm/vdso.h b/arch/arm64/include/asm/vdso.h
index 839ce00..84050c6 100644
--- a/arch/arm64/include/asm/vdso.h
+++ b/arch/arm64/include/asm/vdso.h
@@ -29,6 +29,10 @@
#include <generated/vdso-offsets.h>
+#ifdef CONFIG_ARM64_ILP32
+#include <generated/vdso-ilp32-offsets.h>
+#endif
+
#define VDSO_SYMBOL(base, name) \
({ \
(void *)(vdso_offset_##name - VDSO_LBASE + (unsigned long)(base)); \
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 00c0da4..986962d 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -24,6 +24,7 @@ arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o
obj-y += $(arm64-obj-y) vdso/
+obj-$(CONFIG_ARM64_ILP32) += vdso-ilp32/
obj-m += $(arm64-obj-m)
head-y := head.o
extra-y := $(head-y) vmlinux.lds
@@ -31,3 +32,7 @@ extra-y := $(head-y) vmlinux.lds
# vDSO - this must be built first to generate the symbol offsets
$(call objectify,$(arm64-obj-y)): $(obj)/vdso/vdso-offsets.h
$(obj)/vdso/vdso-offsets.h: $(obj)/vdso
+
+# vDSO - this must be built first to generate the symbol offsets
+$(call objectify,$(arm64-obj-y)): $(obj)/vdso-ilp32/vdso-ilp32-offsets.h
+$(obj)/vdso-ilp32/vdso-ilp32-offsets.h: $(obj)/vdso-ilp32
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index 8168613..fd49b58 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -233,6 +233,10 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka,
if (ka->sa.sa_flags & SA_RESTORER)
sigtramp = ka->sa.sa_restorer;
+#ifdef CONFIG_ARM64_ILP32
+ else if (is_ilp32_compat_task())
+ sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp_ilp32);
+#endif
else
sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp);
diff --git a/arch/arm64/kernel/vdso-ilp32/.gitignore b/arch/arm64/kernel/vdso-ilp32/.gitignore
new file mode 100644
index 0000000..61806c3
--- /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 0000000..c8f5472
--- /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 0000000..46ac072
--- /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 0000000..345d816
--- /dev/null
+++ b/arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S
@@ -0,0 +1,100 @@
+/*
+ * 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
+{
+ . = 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 = .);
+
+ . = ALIGN(PAGE_SIZE);
+ PROVIDE(_vdso_data = .);
+
+ /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;
diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index 31e995b..fee8964 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c
@@ -40,6 +40,12 @@ extern char vdso_start, vdso_end;
static unsigned long vdso_pages;
static struct page **vdso_pagelist;
+#ifdef CONFIG_ARM64_ILP32
+extern char vdso_ilp32_start, vdso_ilp32_end;
+static unsigned long vdso_ilp32_pages;
+static struct page **vdso_ilp32_pagelist;
+#endif
+
/*
* The vDSO data page.
*/
@@ -104,45 +110,78 @@ int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp)
}
#endif /* CONFIG_AARCH32_EL0 */
-static int __init vdso_init(void)
+static inline int __init vdso_init_common(char *vdso_start, char *vdso_end,
+ unsigned long *vdso_pagesp,
+ struct page ***vdso_pagelistp)
{
int i;
+ unsigned long vdso_pages;
+ struct page **vdso_pagelist;
- if (memcmp(&vdso_start, "\177ELF", 4)) {
+ if (memcmp(vdso_start, "\177ELF", 4)) {
pr_err("vDSO is not a valid ELF object!\n");
return -EINVAL;
}
- vdso_pages = (&vdso_end - &vdso_start) >> PAGE_SHIFT;
+ vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
+ *vdso_pagesp = vdso_pages;
pr_info("vdso: %ld pages (%ld code, %ld data) at base %p\n",
- vdso_pages + 1, vdso_pages, 1L, &vdso_start);
+ vdso_pages + 1, vdso_pages, 1L, vdso_start);
/* Allocate the vDSO pagelist, plus a page for the data. */
vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),
GFP_KERNEL);
+ *vdso_pagelistp = vdso_pagelist;
if (vdso_pagelist == NULL)
return -ENOMEM;
/* Grab the vDSO code pages. */
for (i = 0; i < vdso_pages; i++)
- vdso_pagelist[i] = virt_to_page(&vdso_start + i * PAGE_SIZE);
+ vdso_pagelist[i] = virt_to_page(vdso_start + i * PAGE_SIZE);
/* Grab the vDSO data page. */
vdso_pagelist[i] = virt_to_page(vdso_data);
return 0;
}
+
+static int __init vdso_init(void)
+{
+ return vdso_init_common(&vdso_start, &vdso_end,
+ &vdso_pages, &vdso_pagelist);
+}
arch_initcall(vdso_init);
+#ifdef CONFIG_ARM64_ILP32
+static int __init vdso_ilp32_init(void)
+{
+ return vdso_init_common(&vdso_ilp32_start, &vdso_ilp32_end,
+ &vdso_ilp32_pages, &vdso_ilp32_pagelist);
+}
+arch_initcall(vdso_ilp32_init);
+#endif
+
int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp)
{
struct mm_struct *mm = current->mm;
unsigned long vdso_base, vdso_mapping_len;
int ret;
+ struct page **pagelist;
+ unsigned long pages;
/* Be sure to map the data page */
- vdso_mapping_len = (vdso_pages + 1) << PAGE_SHIFT;
+#ifdef CONFIG_ARM64_ILP32
+ if (is_ilp32_compat_task()) {
+ pages = vdso_ilp32_pages;
+ pagelist = vdso_ilp32_pagelist;
+ } else
+#endif
+ {
+ pages = vdso_pages;
+ pagelist = vdso_pagelist;
+ }
+ vdso_mapping_len = (pages + 1) << PAGE_SHIFT;
down_write(&mm->mmap_sem);
vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0);
@@ -155,7 +194,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
ret = install_special_mapping(mm, vdso_base, vdso_mapping_len,
VM_READ|VM_EXEC|
VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
- vdso_pagelist);
+ pagelist);
if (ret) {
mm->context.vdso = NULL;
goto up_fail;
--
1.7.2.5
next prev parent reply other threads:[~2014-05-24 7:03 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-24 7:01 [PATCHv2 00/24] ILP32 Support in ARM64 Andrew Pinski
2014-05-24 7:01 ` [PATCH 01/24] ARM64: Force LP64 to compile the kernel Andrew Pinski
2014-05-24 7:01 ` [PATCH 02/24] ARM64: Rename COMPAT to AARCH32_EL0 in Kconfig Andrew Pinski
2014-05-24 7:01 ` [PATCH 03/24] ARM64: Change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Andrew Pinski
2014-06-17 15:15 ` Catalin Marinas
2014-05-24 7:01 ` [PATCH 04/24] ARM64:ILP32: Set kernel_long to long long so we can reuse most of the same syscalls as LP64 Andrew Pinski
2014-05-24 7:02 ` [PATCH 05/24] ARM64:UAPI: Set the correct __BITS_PER_LONG for ILP32 Andrew Pinski
2014-06-17 15:22 ` Catalin Marinas
2014-06-17 15:29 ` Arnd Bergmann
2014-05-24 7:02 ` [PATCH 06/24] Allow for some signal structures to be the same between a 32bit ABI and the 64bit ABI Andrew Pinski
2014-06-17 15:43 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 07/24] ARM64:ILP32: Use the same size and layout of the signal structures for ILP32 as for LP64 Andrew Pinski
2014-06-17 15:58 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 08/24] Allow a 32bit ABI to use the naming of the 64bit ABI syscalls to avoid confusion of not splitting the registers Andrew Pinski
2014-06-17 16:22 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 09/24] ARM64:ILP32: Use the same syscall names as LP64 Andrew Pinski
2014-06-18 8:51 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 10/24] ARM64: Introduce is_a32_task and is_a32_thread. Use them in the correct locations Andrew Pinski
2014-06-18 17:47 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 11/24] ARM64: Add ARM64_ILP32 to Kconfig Andrew Pinski
2014-05-24 7:02 ` [PATCH 12/24] ARM64: Add is_ilp32_compat_task and is_ilp32_compat_thread and TIF_32BIT_AARCH64 Andrew Pinski
2014-06-19 12:49 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 13/24] Drivers:input: Use is_compat_task for ARM64 also Andrew Pinski
2014-06-19 12:50 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 14/24] ARM64:ILP32: COMPAT_USE_64BIT_TIME is true for ILP32 tasks Andrew Pinski
2014-06-19 12:52 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 15/24] ARM64:ILP32: Use the non compat HWCAP for ILP32 Andrew Pinski
2014-06-19 12:54 ` Catalin Marinas
2014-07-01 13:01 ` Dr. Philipp Tomsich
2014-05-24 7:02 ` [PATCH 16/24] ARM64:ILP32 use the standard start_thread for ILP32 so the processor state is not AARCH32 Andrew Pinski
2014-05-24 7:02 ` [PATCH 17/24] ARM64:ILP32: Support core dump for ILP32 Andrew Pinski
2014-05-24 7:02 ` [PATCH 18/24] ARM64: Add loading of ILP32 binaries Andrew Pinski
2014-05-24 7:02 ` Andrew Pinski [this message]
2014-05-24 7:02 ` [PATCH 20/24] ptrace: Allow compat to use the native siginfo Andrew Pinski
2014-05-24 7:02 ` [PATCH 21/24] ARM64:ILP32: The native siginfo is used instead of the compat siginfo Andrew Pinski
2014-05-24 18:56 ` H. Peter Anvin
2014-05-24 7:02 ` [PATCH 22/24] ARM64:ILP32: Use a seperate syscall table as a few syscalls need to be using the compat syscalls Andrew Pinski
2014-07-01 15:05 ` Catalin Marinas
2014-07-01 15:30 ` Pinski, Andrew
2014-07-01 16:38 ` Arnd Bergmann
2014-07-01 16:50 ` Catalin Marinas
2014-07-01 17:04 ` Arnd Bergmann
2014-07-01 16:49 ` Catalin Marinas
2014-05-24 7:02 ` [PATCH 23/24] ARM64:ILP32: Fix signal return for ILP32 when the user modified the signal stack Andrew Pinski
2014-05-24 7:02 ` [PATCH 24/24] Add documentation about ARM64 ILP32 ABI Andrew Pinski
2014-06-16 17:08 ` [PATCHv2 00/24] ILP32 Support in ARM64 Catalin Marinas
2014-06-16 17:19 ` Pinski, Andrew
2014-06-17 10:43 ` Catalin Marinas
2014-06-17 11:30 ` Pinski, Andrew
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