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Message-Id: <20180516081910.10067-16-ynorov@caviumnetworks.com>
Date: Wed, 16 May 2018 11:19:00 +0300
From: Yury Norov <ynorov@...iumnetworks.com>
To: Catalin Marinas <catalin.marinas@....com>,
Arnd Bergmann <arnd@...db.de>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-arch@...r.kernel.org,
linux-api@...r.kernel.org
Cc: Yury Norov <ynorov@...iumnetworks.com>,
Adam Borowski <kilobyte@...band.pl>,
Alexander Graf <agraf@...e.de>,
Alexey Klimov <klimov.linux@...il.com>,
Andreas Schwab <schwab@...e.de>,
Andrew Pinski <pinskia@...il.com>,
Bamvor Zhangjian <bamv2005@...il.com>,
Chris Metcalf <cmetcalf@...lanox.com>,
Christoph Muellner <christoph.muellner@...obroma-systems.com>,
Dave Martin <Dave.Martin@....com>,
"David S . Miller" <davem@...emloft.net>,
Florian Weimer <fweimer@...hat.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Heiko Carstens <heiko.carstens@...ibm.com>,
James Hogan <james.hogan@...tec.com>,
James Morse <james.morse@....com>,
Joseph Myers <joseph@...esourcery.com>,
Lin Yongting <linyongting@...wei.com>,
Manuel Montezelo <manuel.montezelo@...il.com>,
Mark Brown <broonie@...nel.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
Nathan_Lynch <Nathan_Lynch@...tor.com>,
Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
Prasun Kapoor <Prasun.Kapoor@...iumnetworks.com>,
Ramana Radhakrishnan <ramana.gcc@...glemail.com>,
Steve Ellcey <sellcey@...iumnetworks.com>,
Szabolcs Nagy <szabolcs.nagy@....com>
Subject: [PATCH 15/24] arm64: ilp32: introduce binfmt_ilp32.c
Like binfmt_elf32.c for AARCH32, binfmt_ilp32.c is needed to handle
ILP32 binaries.
Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
Signed-off-by: Bamvor Jian Zhang <bamv2005@...il.com>
---
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/binfmt_ilp32.c | 87 ++++++++++++++++++++++++++++++++
2 files changed, 88 insertions(+)
create mode 100644 arch/arm64/kernel/binfmt_ilp32.c
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index c63e0164fc12..3114191750ae 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -28,6 +28,7 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
arm64-obj-$(CONFIG_AARCH32_EL0) += sys32.o kuser32.o signal32.o \
sys_compat.o entry32.o binfmt_elf32.o
+arm64-obj-$(CONFIG_ARM64_ILP32) += binfmt_ilp32.o
arm64-obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o
arm64-obj-$(CONFIG_ARM64_MODULE_PLTS) += module-plts.o
diff --git a/arch/arm64/kernel/binfmt_ilp32.c b/arch/arm64/kernel/binfmt_ilp32.c
new file mode 100644
index 000000000000..26b2477d190d
--- /dev/null
+++ b/arch/arm64/kernel/binfmt_ilp32.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Support for ILP32 Linux/aarch64 ELF binaries.
+ */
+#undef CONFIG_AARCH32_EL0
+#define compat_elf_gregset_t elf_gregset_t
+
+#include <linux/elfcore-compat.h>
+#include <linux/time.h>
+
+#undef ELF_CLASS
+#define ELF_CLASS ELFCLASS32
+
+#undef elfhdr
+#undef elf_phdr
+#undef elf_shdr
+#undef elf_note
+#undef elf_addr_t
+#define elfhdr elf32_hdr
+#define elf_phdr elf32_phdr
+#define elf_shdr elf32_shdr
+#define elf_note elf32_note
+#define elf_addr_t Elf32_Addr
+
+/*
+ * Some data types as stored in coredump.
+ */
+#define user_long_t compat_long_t
+#define user_siginfo_t compat_siginfo_t
+#define copy_siginfo_to_user copy_siginfo_to_user32
+
+/*
+ * The machine-dependent core note format types are defined in elfcore-compat.h,
+ * which requires asm/elf.h to define compat_elf_gregset_t et al.
+ */
+#define elf_prstatus compat_elf_prstatus
+#define elf_prpsinfo compat_elf_prpsinfo
+
+/* AARCH64 ILP32 EABI. */
+#undef elf_check_arch
+#define elf_check_arch(x) (((x)->e_machine == EM_AARCH64) \
+ && (x)->e_ident[EI_CLASS] == ELFCLASS32)
+
+#undef SET_PERSONALITY
+#define SET_PERSONALITY(ex) \
+do { \
+ set_bit(TIF_32BIT, ¤t->mm->context.flags); \
+ set_thread_flag(TIF_32BIT_AARCH64); \
+ clear_thread_flag(TIF_32BIT); \
+} while (0)
+
+#undef ARCH_DLINFO
+#define ARCH_DLINFO \
+do { \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, \
+ (elf_addr_t)(long)current->mm->context.vdso); \
+} while (0)
+
+#undef ELF_PLATFORM
+#ifdef __AARCH64EB__
+#define ELF_PLATFORM ("aarch64_be:ilp32")
+#else
+#define ELF_PLATFORM ("aarch64:ilp32")
+#endif
+
+#undef ELF_ET_DYN_BASE
+#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
+
+#undef ELF_HWCAP
+#undef ELF_HWCAP2
+#define ELF_HWCAP ((u32) elf_hwcap)
+#define ELF_HWCAP2 ((u32) (elf_hwcap >> 32))
+
+/*
+ * Rename a few of the symbols that binfmt_elf.c will define.
+ * These are all local so the names don't really matter, but it
+ * might make some debugging less confusing not to duplicate them.
+ */
+#define elf_format compat_elf_format
+#define init_elf_binfmt init_compat_elf_binfmt
+#define exit_elf_binfmt exit_compat_elf_binfmt
+
+#undef ns_to_timeval
+#define ns_to_timeval ns_to_compat_timeval
+
+#include "../../../fs/binfmt_elf.c"
--
2.17.0
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