forked from mirrors/linux
0d747f6585
For AArch32 tasks, we install a special "[vectors]" page that contains the sigreturn trampolines and kuser helpers, which is mapped at a fixed address specified by the kuser helpers ABI. Having the sigreturn trampolines in the same page as the kuser helpers makes it impossible to disable the kuser helpers independently. Follow the Arm implementation, by moving the signal trampolines out of the "[vectors]" page and into their own "[sigpage]". Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> [will: tweaked comments and fixed sparse warning] Signed-off-by: Will Deacon <will.deacon@arm.com>
226 lines
6.3 KiB
C
226 lines
6.3 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_ELF_H
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#define __ASM_ELF_H
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#include <asm/hwcap.h>
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/*
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* ELF register definitions..
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*/
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#include <asm/ptrace.h>
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#include <asm/user.h>
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/*
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* AArch64 static relocation types.
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*/
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/* Miscellaneous. */
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#define R_ARM_NONE 0
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#define R_AARCH64_NONE 256
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/* Data. */
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#define R_AARCH64_ABS64 257
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#define R_AARCH64_ABS32 258
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#define R_AARCH64_ABS16 259
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#define R_AARCH64_PREL64 260
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#define R_AARCH64_PREL32 261
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#define R_AARCH64_PREL16 262
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/* Instructions. */
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#define R_AARCH64_MOVW_UABS_G0 263
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#define R_AARCH64_MOVW_UABS_G0_NC 264
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#define R_AARCH64_MOVW_UABS_G1 265
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#define R_AARCH64_MOVW_UABS_G1_NC 266
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#define R_AARCH64_MOVW_UABS_G2 267
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#define R_AARCH64_MOVW_UABS_G2_NC 268
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#define R_AARCH64_MOVW_UABS_G3 269
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#define R_AARCH64_MOVW_SABS_G0 270
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#define R_AARCH64_MOVW_SABS_G1 271
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#define R_AARCH64_MOVW_SABS_G2 272
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#define R_AARCH64_LD_PREL_LO19 273
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#define R_AARCH64_ADR_PREL_LO21 274
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#define R_AARCH64_ADR_PREL_PG_HI21 275
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#define R_AARCH64_ADR_PREL_PG_HI21_NC 276
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#define R_AARCH64_ADD_ABS_LO12_NC 277
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#define R_AARCH64_LDST8_ABS_LO12_NC 278
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#define R_AARCH64_TSTBR14 279
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#define R_AARCH64_CONDBR19 280
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#define R_AARCH64_JUMP26 282
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#define R_AARCH64_CALL26 283
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#define R_AARCH64_LDST16_ABS_LO12_NC 284
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#define R_AARCH64_LDST32_ABS_LO12_NC 285
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#define R_AARCH64_LDST64_ABS_LO12_NC 286
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#define R_AARCH64_LDST128_ABS_LO12_NC 299
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#define R_AARCH64_MOVW_PREL_G0 287
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#define R_AARCH64_MOVW_PREL_G0_NC 288
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#define R_AARCH64_MOVW_PREL_G1 289
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#define R_AARCH64_MOVW_PREL_G1_NC 290
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#define R_AARCH64_MOVW_PREL_G2 291
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#define R_AARCH64_MOVW_PREL_G2_NC 292
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#define R_AARCH64_MOVW_PREL_G3 293
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#define R_AARCH64_RELATIVE 1027
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_CLASS ELFCLASS64
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#ifdef __AARCH64EB__
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#define ELF_DATA ELFDATA2MSB
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#else
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#define ELF_DATA ELFDATA2LSB
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#endif
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#define ELF_ARCH EM_AARCH64
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/*
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* This yields a string that ld.so will use to load implementation
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* specific libraries for optimization. This is more specific in
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* intent than poking at uname or /proc/cpuinfo.
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*/
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#define ELF_PLATFORM_SIZE 16
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#ifdef __AARCH64EB__
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#define ELF_PLATFORM ("aarch64_be")
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#else
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#define ELF_PLATFORM ("aarch64")
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#endif
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) ((x)->e_machine == EM_AARCH64)
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#define elf_read_implies_exec(ex,stk) (stk != EXSTACK_DISABLE_X)
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#define CORE_DUMP_USE_REGSET
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#define ELF_EXEC_PAGESIZE PAGE_SIZE
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/*
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* This is the base location for PIE (ET_DYN with INTERP) loads. On
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* 64-bit, this is above 4GB to leave the entire 32-bit address
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* space open for things that want to use the area for 32-bit pointers.
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*/
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#ifdef CONFIG_ARM64_FORCE_52BIT
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#define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3)
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#else
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#define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3)
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#endif /* CONFIG_ARM64_FORCE_52BIT */
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#ifndef __ASSEMBLY__
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#include <linux/bug.h>
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#include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
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typedef unsigned long elf_greg_t;
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#define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
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#define ELF_CORE_COPY_REGS(dest, regs) \
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*(struct user_pt_regs *)&(dest) = (regs)->user_regs;
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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typedef struct user_fpsimd_state elf_fpregset_t;
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/*
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* When the program starts, a1 contains a pointer to a function to be
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* registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
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* such handler.
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*/
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#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
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#define SET_PERSONALITY(ex) \
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({ \
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clear_thread_flag(TIF_32BIT); \
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current->personality &= ~READ_IMPLIES_EXEC; \
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})
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/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
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#define ARCH_DLINFO \
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do { \
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NEW_AUX_ENT(AT_SYSINFO_EHDR, \
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(elf_addr_t)current->mm->context.vdso); \
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\
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/* \
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* Should always be nonzero unless there's a kernel bug. \
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* If we haven't determined a sensible value to give to \
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* userspace, omit the entry: \
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*/ \
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if (likely(signal_minsigstksz)) \
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NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
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else \
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NEW_AUX_ENT(AT_IGNORE, 0); \
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} while (0)
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
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struct linux_binprm;
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extern int arch_setup_additional_pages(struct linux_binprm *bprm,
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int uses_interp);
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/* 1GB of VA */
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#ifdef CONFIG_COMPAT
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#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
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0x7ff >> (PAGE_SHIFT - 12) : \
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0x3ffff >> (PAGE_SHIFT - 12))
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#else
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#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
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#endif
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#ifdef __AARCH64EB__
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#define COMPAT_ELF_PLATFORM ("v8b")
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#else
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#define COMPAT_ELF_PLATFORM ("v8l")
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#endif
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#ifdef CONFIG_COMPAT
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/* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
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#define COMPAT_ELF_ET_DYN_BASE 0x000400000UL
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/* AArch32 registers. */
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#define COMPAT_ELF_NGREG 18
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typedef unsigned int compat_elf_greg_t;
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typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
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/* AArch32 EABI. */
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#define EF_ARM_EABI_MASK 0xff000000
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#define compat_elf_check_arch(x) (system_supports_32bit_el0() && \
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((x)->e_machine == EM_ARM) && \
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((x)->e_flags & EF_ARM_EABI_MASK))
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#define compat_start_thread compat_start_thread
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/*
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* Unlike the native SET_PERSONALITY macro, the compat version maintains
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* READ_IMPLIES_EXEC across an execve() since this is the behaviour on
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* arch/arm/.
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*/
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#define COMPAT_SET_PERSONALITY(ex) \
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({ \
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set_thread_flag(TIF_32BIT); \
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})
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#define COMPAT_ARCH_DLINFO
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extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
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int uses_interp);
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#define compat_arch_setup_additional_pages \
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aarch32_setup_additional_pages
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#endif /* CONFIG_COMPAT */
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#endif /* !__ASSEMBLY__ */
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#endif
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