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    Subject[PATCH v3 16/31] arm64: ELF definitions
    Date
    This patch adds definitions for the ELF format, including personality
    personality setting and EXEC_PAGESIZE. The are only two hwcap
    definitions for 64-bit applications - HWCAP_FP and HWCAP_ASIMD.

    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Acked-by: Tony Lindgren <tony@atomide.com>
    ---
    arch/arm64/include/asm/auxvec.h | 22 +++++
    arch/arm64/include/asm/elf.h | 179 +++++++++++++++++++++++++++++++++++++
    arch/arm64/include/asm/hwcap.h | 53 +++++++++++
    arch/arm64/include/asm/param.h | 23 +++++
    arch/arm64/include/asm/shmparam.h | 28 ++++++
    5 files changed, 305 insertions(+), 0 deletions(-)
    create mode 100644 arch/arm64/include/asm/auxvec.h
    create mode 100644 arch/arm64/include/asm/elf.h
    create mode 100644 arch/arm64/include/asm/hwcap.h
    create mode 100644 arch/arm64/include/asm/param.h
    create mode 100644 arch/arm64/include/asm/shmparam.h

    diff --git a/arch/arm64/include/asm/auxvec.h b/arch/arm64/include/asm/auxvec.h
    new file mode 100644
    index 0000000..22d6d88
    --- /dev/null
    +++ b/arch/arm64/include/asm/auxvec.h
    @@ -0,0 +1,22 @@
    +/*
    + * Copyright (C) 2012 ARM Ltd.
    + *
    + * 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/>.
    + */
    +#ifndef __ASM_AUXVEC_H
    +#define __ASM_AUXVEC_H
    +
    +/* vDSO location */
    +#define AT_SYSINFO_EHDR 33
    +
    +#endif
    diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
    new file mode 100644
    index 0000000..cf28464
    --- /dev/null
    +++ b/arch/arm64/include/asm/elf.h
    @@ -0,0 +1,179 @@
    +/*
    + * Copyright (C) 2012 ARM Ltd.
    + *
    + * 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/>.
    + */
    +#ifndef __ASM_ELF_H
    +#define __ASM_ELF_H
    +
    +#include <asm/hwcap.h>
    +
    +/*
    + * ELF register definitions..
    + */
    +#include <asm/ptrace.h>
    +#include <asm/user.h>
    +
    +typedef unsigned long elf_greg_t;
    +typedef unsigned long elf_freg_t[3];
    +
    +#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
    +typedef elf_greg_t elf_gregset_t[ELF_NGREG];
    +
    +typedef struct user_fp elf_fpregset_t;
    +
    +#define EM_AARCH64 183
    +
    +/*
    + * AArch64 static relocation types.
    + */
    +
    +/* Miscellaneous. */
    +#define R_ARM_NONE 0
    +#define R_AARCH64_NONE 256
    +
    +/* Data. */
    +#define R_AARCH64_ABS64 257
    +#define R_AARCH64_ABS32 258
    +#define R_AARCH64_ABS16 259
    +#define R_AARCH64_PREL64 260
    +#define R_AARCH64_PREL32 261
    +#define R_AARCH64_PREL16 262
    +
    +/* Instructions. */
    +#define R_AARCH64_MOVW_UABS_G0 263
    +#define R_AARCH64_MOVW_UABS_G0_NC 264
    +#define R_AARCH64_MOVW_UABS_G1 265
    +#define R_AARCH64_MOVW_UABS_G1_NC 266
    +#define R_AARCH64_MOVW_UABS_G2 267
    +#define R_AARCH64_MOVW_UABS_G2_NC 268
    +#define R_AARCH64_MOVW_UABS_G3 269
    +
    +#define R_AARCH64_MOVW_SABS_G0 270
    +#define R_AARCH64_MOVW_SABS_G1 271
    +#define R_AARCH64_MOVW_SABS_G2 272
    +
    +#define R_AARCH64_LD_PREL_LO19 273
    +#define R_AARCH64_ADR_PREL_LO21 274
    +#define R_AARCH64_ADR_PREL_PG_HI21 275
    +#define R_AARCH64_ADR_PREL_PG_HI21_NC 276
    +#define R_AARCH64_ADD_ABS_LO12_NC 277
    +#define R_AARCH64_LDST8_ABS_LO12_NC 278
    +
    +#define R_AARCH64_TSTBR14 279
    +#define R_AARCH64_CONDBR19 280
    +#define R_AARCH64_JUMP26 282
    +#define R_AARCH64_CALL26 283
    +#define R_AARCH64_LDST16_ABS_LO12_NC 284
    +#define R_AARCH64_LDST32_ABS_LO12_NC 285
    +#define R_AARCH64_LDST64_ABS_LO12_NC 286
    +#define R_AARCH64_LDST128_ABS_LO12_NC 299
    +
    +#define R_AARCH64_MOVW_PREL_G0 287
    +#define R_AARCH64_MOVW_PREL_G0_NC 288
    +#define R_AARCH64_MOVW_PREL_G1 289
    +#define R_AARCH64_MOVW_PREL_G1_NC 290
    +#define R_AARCH64_MOVW_PREL_G2 291
    +#define R_AARCH64_MOVW_PREL_G2_NC 292
    +#define R_AARCH64_MOVW_PREL_G3 293
    +
    +
    +/*
    + * These are used to set parameters in the core dumps.
    + */
    +#define ELF_CLASS ELFCLASS64
    +#define ELF_DATA ELFDATA2LSB
    +#define ELF_ARCH EM_AARCH64
    +
    +#define ELF_PLATFORM_SIZE 16
    +#define ELF_PLATFORM ("aarch64")
    +
    +/*
    + * This is used to ensure we don't load something for the wrong architecture.
    + */
    +#define elf_check_arch(x) ((x)->e_machine == EM_AARCH64)
    +
    +#define elf_read_implies_exec(ex,stk) (stk != EXSTACK_DISABLE_X)
    +
    +#define CORE_DUMP_USE_REGSET
    +#define ELF_EXEC_PAGESIZE PAGE_SIZE
    +
    +/*
    + * This is the location that an ET_DYN program is loaded if exec'ed. Typical
    + * use of this is to invoke "./ld.so someprog" to test out a new version of
    + * the loader. We need to make sure that it is out of the way of the program
    + * that it will "exec", and that there is sufficient room for the brk.
    + */
    +extern unsigned long randomize_et_dyn(unsigned long base);
    +#define ELF_ET_DYN_BASE (randomize_et_dyn(2 * TASK_SIZE_64 / 3))
    +
    +/*
    + * When the program starts, a1 contains a pointer to a function to be
    + * registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
    + * such handler.
    + */
    +#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
    +
    +#define SET_PERSONALITY(ex) clear_thread_flag(TIF_32BIT);
    +
    +#define ARCH_DLINFO \
    +do { \
    + NEW_AUX_ENT(AT_SYSINFO_EHDR, \
    + (elf_addr_t)current->mm->context.vdso); \
    +} while (0)
    +
    +#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
    +struct linux_binprm;
    +extern int arch_setup_additional_pages(struct linux_binprm *bprm,
    + int uses_interp);
    +
    +/* 1GB of VA */
    +#ifdef CONFIG_COMPAT
    +#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
    + 0x7ff >> (PAGE_SHIFT - 12) : \
    + 0x3ffff >> (PAGE_SHIFT - 12))
    +#else
    +#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
    +#endif
    +
    +struct mm_struct;
    +extern unsigned long arch_randomize_brk(struct mm_struct *mm);
    +#define arch_randomize_brk arch_randomize_brk
    +
    +#ifdef CONFIG_COMPAT
    +#define EM_ARM 40
    +#define COMPAT_ELF_PLATFORM ("v8l")
    +
    +#define COMPAT_ELF_ET_DYN_BASE (randomize_et_dyn(2 * TASK_SIZE_32 / 3))
    +
    +/* AArch32 registers. */
    +#define COMPAT_ELF_NGREG 18
    +typedef unsigned int compat_elf_greg_t;
    +typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
    +
    +/* AArch32 EABI. */
    +#define EF_ARM_EABI_MASK 0xff000000
    +#define compat_elf_check_arch(x) (((x)->e_machine == EM_ARM) && \
    + ((x)->e_flags & EF_ARM_EABI_MASK))
    +
    +#define compat_start_thread compat_start_thread
    +#define COMPAT_SET_PERSONALITY(ex) set_thread_flag(TIF_32BIT);
    +#define COMPAT_ARCH_DLINFO
    +extern int aarch32_setup_vectors_page(struct linux_binprm *bprm,
    + int uses_interp);
    +#define compat_arch_setup_additional_pages \
    + aarch32_setup_vectors_page
    +
    +#endif /* CONFIG_COMPAT */
    +
    +#endif
    diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
    new file mode 100644
    index 0000000..f8190ba
    --- /dev/null
    +++ b/arch/arm64/include/asm/hwcap.h
    @@ -0,0 +1,53 @@
    +/*
    + * Copyright (C) 2012 ARM Ltd.
    + *
    + * 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/>.
    + */
    +#ifndef __ASM_HWCAP_H
    +#define __ASM_HWCAP_H
    +
    +/*
    + * HWCAP flags - for elf_hwcap (in kernel) and AT_HWCAP
    + */
    +#define HWCAP_FP (1 << 0)
    +#define HWCAP_ASIMD (1 << 1)
    +
    +#define COMPAT_HWCAP_HALF (1 << 1)
    +#define COMPAT_HWCAP_THUMB (1 << 2)
    +#define COMPAT_HWCAP_FAST_MULT (1 << 4)
    +#define COMPAT_HWCAP_VFP (1 << 6)
    +#define COMPAT_HWCAP_EDSP (1 << 7)
    +#define COMPAT_HWCAP_NEON (1 << 12)
    +#define COMPAT_HWCAP_VFPv3 (1 << 13)
    +#define COMPAT_HWCAP_TLS (1 << 15)
    +#define COMPAT_HWCAP_VFPv4 (1 << 16)
    +#define COMPAT_HWCAP_IDIVA (1 << 17)
    +#define COMPAT_HWCAP_IDIVT (1 << 18)
    +#define COMPAT_HWCAP_IDIV (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT)
    +
    +#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
    +/*
    + * This yields a mask that user programs can use to figure out what
    + * instruction set this cpu supports.
    + */
    +#define ELF_HWCAP (elf_hwcap)
    +#define COMPAT_ELF_HWCAP (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
    + COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
    + COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
    + COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
    + COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
    +
    +extern unsigned int elf_hwcap;
    +#endif
    +
    +#endif
    diff --git a/arch/arm64/include/asm/param.h b/arch/arm64/include/asm/param.h
    new file mode 100644
    index 0000000..8e3a281
    --- /dev/null
    +++ b/arch/arm64/include/asm/param.h
    @@ -0,0 +1,23 @@
    +/*
    + * Copyright (C) 2012 ARM Ltd.
    + *
    + * 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/>.
    + */
    +#ifndef __ASM_PARAM_H
    +#define __ASM_PARAM_H
    +
    +#define EXEC_PAGESIZE 65536
    +
    +#include <asm-generic/param.h>
    +
    +#endif
    diff --git a/arch/arm64/include/asm/shmparam.h b/arch/arm64/include/asm/shmparam.h
    new file mode 100644
    index 0000000..4df608a
    --- /dev/null
    +++ b/arch/arm64/include/asm/shmparam.h
    @@ -0,0 +1,28 @@
    +/*
    + * Copyright (C) 2012 ARM Ltd.
    + *
    + * 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/>.
    + */
    +#ifndef __ASM_SHMPARAM_H
    +#define __ASM_SHMPARAM_H
    +
    +/*
    + * For IPC syscalls from compat tasks, we need to use the legacy 16k
    + * alignment value. Since we don't have aliasing D-caches, the rest of
    + * the time we can safely use PAGE_SIZE.
    + */
    +#define COMPAT_SHMLBA 0x4000
    +
    +#include <asm-generic/shmparam.h>
    +
    +#endif /* __ASM_SHMPARAM_H */


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