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-rw-r--r--arch/x86/include/asm/elf.h400
1 files changed, 400 insertions, 0 deletions
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
new file mode 100644
index 000000000..cb0ff1055
--- /dev/null
+++ b/arch/x86/include/asm/elf.h
@@ -0,0 +1,400 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_ELF_H
+#define _ASM_X86_ELF_H
+
+/*
+ * ELF register definitions..
+ */
+#include <linux/thread_info.h>
+
+#include <asm/ptrace.h>
+#include <asm/user.h>
+#include <asm/auxvec.h>
+#include <asm/fsgsbase.h>
+
+typedef unsigned long elf_greg_t;
+
+#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef struct user_i387_struct elf_fpregset_t;
+
+#ifdef __i386__
+
+#define R_386_NONE 0
+#define R_386_32 1
+#define R_386_PC32 2
+#define R_386_GOT32 3
+#define R_386_PLT32 4
+#define R_386_COPY 5
+#define R_386_GLOB_DAT 6
+#define R_386_JMP_SLOT 7
+#define R_386_RELATIVE 8
+#define R_386_GOTOFF 9
+#define R_386_GOTPC 10
+#define R_386_NUM 11
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS ELFCLASS32
+#define ELF_DATA ELFDATA2LSB
+#define ELF_ARCH EM_386
+
+#else
+
+/* x86-64 relocation types */
+#define R_X86_64_NONE 0 /* No reloc */
+#define R_X86_64_64 1 /* Direct 64 bit */
+#define R_X86_64_PC32 2 /* PC relative 32 bit signed */
+#define R_X86_64_GOT32 3 /* 32 bit GOT entry */
+#define R_X86_64_PLT32 4 /* 32 bit PLT address */
+#define R_X86_64_COPY 5 /* Copy symbol at runtime */
+#define R_X86_64_GLOB_DAT 6 /* Create GOT entry */
+#define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */
+#define R_X86_64_RELATIVE 8 /* Adjust by program base */
+#define R_X86_64_GOTPCREL 9 /* 32 bit signed pc relative
+ offset to GOT */
+#define R_X86_64_32 10 /* Direct 32 bit zero extended */
+#define R_X86_64_32S 11 /* Direct 32 bit sign extended */
+#define R_X86_64_16 12 /* Direct 16 bit zero extended */
+#define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */
+#define R_X86_64_8 14 /* Direct 8 bit sign extended */
+#define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */
+#define R_X86_64_PC64 24 /* Place relative 64-bit signed */
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS ELFCLASS64
+#define ELF_DATA ELFDATA2LSB
+#define ELF_ARCH EM_X86_64
+
+#endif
+
+#include <asm/vdso.h>
+
+#ifdef CONFIG_X86_64
+extern unsigned int vdso64_enabled;
+#endif
+#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
+extern unsigned int vdso32_enabled;
+#endif
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch_ia32(x) \
+ (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
+
+#include <asm/processor.h>
+
+#ifdef CONFIG_X86_32
+#include <asm/desc.h>
+
+#define elf_check_arch(x) elf_check_arch_ia32(x)
+
+/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
+ contains a pointer to a function which might be registered using `atexit'.
+ This provides a mean for the dynamic linker to call DT_FINI functions for
+ shared libraries that have been loaded before the code runs.
+
+ A value of 0 tells we have no such handler.
+
+ We might as well make sure everything else is cleared too (except for %esp),
+ just to make things more deterministic.
+ */
+#define ELF_PLAT_INIT(_r, load_addr) \
+ do { \
+ _r->bx = 0; _r->cx = 0; _r->dx = 0; \
+ _r->si = 0; _r->di = 0; _r->bp = 0; \
+ _r->ax = 0; \
+} while (0)
+
+/*
+ * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
+ * now struct_user_regs, they are different)
+ */
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs) \
+do { \
+ pr_reg[0] = regs->bx; \
+ pr_reg[1] = regs->cx; \
+ pr_reg[2] = regs->dx; \
+ pr_reg[3] = regs->si; \
+ pr_reg[4] = regs->di; \
+ pr_reg[5] = regs->bp; \
+ pr_reg[6] = regs->ax; \
+ pr_reg[7] = regs->ds; \
+ pr_reg[8] = regs->es; \
+ pr_reg[9] = regs->fs; \
+ savesegment(gs, pr_reg[10]); \
+ pr_reg[11] = regs->orig_ax; \
+ pr_reg[12] = regs->ip; \
+ pr_reg[13] = regs->cs; \
+ pr_reg[14] = regs->flags; \
+ pr_reg[15] = regs->sp; \
+ pr_reg[16] = regs->ss; \
+} while (0);
+
+#define ELF_PLATFORM (utsname()->machine)
+#define set_personality_64bit() do { } while (0)
+
+#else /* CONFIG_X86_32 */
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x) \
+ ((x)->e_machine == EM_X86_64)
+
+#define compat_elf_check_arch(x) \
+ (elf_check_arch_ia32(x) || \
+ (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
+
+#if __USER32_DS != __USER_DS
+# error "The following code assumes __USER32_DS == __USER_DS"
+#endif
+
+static inline void elf_common_init(struct thread_struct *t,
+ struct pt_regs *regs, const u16 ds)
+{
+ /* ax gets execve's return value. */
+ /*regs->ax = */ regs->bx = regs->cx = regs->dx = 0;
+ regs->si = regs->di = regs->bp = 0;
+ regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0;
+ regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
+ t->fsbase = t->gsbase = 0;
+ t->fsindex = t->gsindex = 0;
+ t->ds = t->es = ds;
+}
+
+#define ELF_PLAT_INIT(_r, load_addr) \
+ elf_common_init(&current->thread, _r, 0)
+
+#define COMPAT_ELF_PLAT_INIT(regs, load_addr) \
+ elf_common_init(&current->thread, regs, __USER_DS)
+
+void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32);
+#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \
+ compat_start_thread(regs, new_ip, new_sp, ex->e_machine == EM_X86_64)
+
+void set_personality_ia32(bool);
+#define COMPAT_SET_PERSONALITY(ex) \
+ set_personality_ia32((ex).e_machine == EM_X86_64)
+
+#define COMPAT_ELF_PLATFORM ("i686")
+
+/*
+ * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
+ * now struct_user_regs, they are different). Assumes current is the process
+ * getting dumped.
+ */
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs) \
+do { \
+ unsigned v; \
+ (pr_reg)[0] = (regs)->r15; \
+ (pr_reg)[1] = (regs)->r14; \
+ (pr_reg)[2] = (regs)->r13; \
+ (pr_reg)[3] = (regs)->r12; \
+ (pr_reg)[4] = (regs)->bp; \
+ (pr_reg)[5] = (regs)->bx; \
+ (pr_reg)[6] = (regs)->r11; \
+ (pr_reg)[7] = (regs)->r10; \
+ (pr_reg)[8] = (regs)->r9; \
+ (pr_reg)[9] = (regs)->r8; \
+ (pr_reg)[10] = (regs)->ax; \
+ (pr_reg)[11] = (regs)->cx; \
+ (pr_reg)[12] = (regs)->dx; \
+ (pr_reg)[13] = (regs)->si; \
+ (pr_reg)[14] = (regs)->di; \
+ (pr_reg)[15] = (regs)->orig_ax; \
+ (pr_reg)[16] = (regs)->ip; \
+ (pr_reg)[17] = (regs)->cs; \
+ (pr_reg)[18] = (regs)->flags; \
+ (pr_reg)[19] = (regs)->sp; \
+ (pr_reg)[20] = (regs)->ss; \
+ (pr_reg)[21] = x86_fsbase_read_cpu(); \
+ (pr_reg)[22] = x86_gsbase_read_cpu_inactive(); \
+ asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \
+ asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \
+ asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \
+ asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \
+} while (0);
+
+/* I'm not sure if we can use '-' here */
+#define ELF_PLATFORM ("x86_64")
+extern void set_personality_64bit(void);
+extern unsigned int sysctl_vsyscall32;
+extern int force_personality32;
+
+#endif /* !CONFIG_X86_32 */
+
+#define CORE_DUMP_USE_REGSET
+#define ELF_EXEC_PAGESIZE 4096
+
+/*
+ * This is the base location for PIE (ET_DYN with INTERP) loads. On
+ * 64-bit, this is above 4GB to leave the entire 32-bit address
+ * space open for things that want to use the area for 32-bit pointers.
+ */
+#define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \
+ (DEFAULT_MAP_WINDOW / 3 * 2))
+
+/* This yields a mask that user programs can use to figure out what
+ instruction set this CPU supports. This could be done in user space,
+ but it's not easy, and we've already done it here. */
+
+#define ELF_HWCAP (boot_cpu_data.x86_capability[CPUID_1_EDX])
+
+extern u32 elf_hwcap2;
+
+/*
+ * HWCAP2 supplies mask with kernel enabled CPU features, so that
+ * the application can discover that it can safely use them.
+ * The bits are defined in uapi/asm/hwcap2.h.
+ */
+#define ELF_HWCAP2 (elf_hwcap2)
+
+/* This yields a string that ld.so will use to load implementation
+ specific libraries for optimization. This is more specific in
+ intent than poking at uname or /proc/cpuinfo.
+
+ For the moment, we have only optimizations for the Intel generations,
+ but that could change... */
+
+#define SET_PERSONALITY(ex) set_personality_64bit()
+
+/*
+ * An executable for which elf_read_implies_exec() returns TRUE will
+ * have the READ_IMPLIES_EXEC personality flag set automatically.
+ *
+ * The decision process for determining the results are:
+ *
+ * CPU: | lacks NX* | has NX, ia32 | has NX, x86_64 |
+ * ELF: | | | |
+ * ---------------------|------------|------------------|----------------|
+ * missing PT_GNU_STACK | exec-all | exec-all | exec-none |
+ * PT_GNU_STACK == RWX | exec-stack | exec-stack | exec-stack |
+ * PT_GNU_STACK == RW | exec-none | exec-none | exec-none |
+ *
+ * exec-all : all PROT_READ user mappings are executable, except when
+ * backed by files on a noexec-filesystem.
+ * exec-none : only PROT_EXEC user mappings are executable.
+ * exec-stack: only the stack and PROT_EXEC user mappings are executable.
+ *
+ * *this column has no architectural effect: NX markings are ignored by
+ * hardware, but may have behavioral effects when "wants X" collides with
+ * "cannot be X" constraints in memory permission flags, as in
+ * https://lkml.kernel.org/r/20190418055759.GA3155@mellanox.com
+ *
+ */
+#define elf_read_implies_exec(ex, executable_stack) \
+ (mmap_is_ia32() && executable_stack == EXSTACK_DEFAULT)
+
+struct task_struct;
+
+#define ARCH_DLINFO_IA32 \
+do { \
+ if (VDSO_CURRENT_BASE) { \
+ NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \
+ } \
+ NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \
+} while (0)
+
+/*
+ * True on X86_32 or when emulating IA32 on X86_64
+ */
+static inline int mmap_is_ia32(void)
+{
+ return IS_ENABLED(CONFIG_X86_32) ||
+ (IS_ENABLED(CONFIG_COMPAT) &&
+ test_thread_flag(TIF_ADDR32));
+}
+
+extern unsigned long task_size_32bit(void);
+extern unsigned long task_size_64bit(int full_addr_space);
+extern unsigned long get_mmap_base(int is_legacy);
+extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len);
+extern unsigned long get_sigframe_size(void);
+
+#ifdef CONFIG_X86_32
+
+#define __STACK_RND_MASK(is32bit) (0x7ff)
+#define STACK_RND_MASK (0x7ff)
+
+#define ARCH_DLINFO ARCH_DLINFO_IA32
+
+/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
+
+#else /* CONFIG_X86_32 */
+
+/* 1GB for 64bit, 8MB for 32bit */
+#define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff)
+#define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32())
+
+#define ARCH_DLINFO \
+do { \
+ if (vdso64_enabled) \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, \
+ (unsigned long __force)current->mm->context.vdso); \
+ NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \
+} while (0)
+
+/* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */
+#define ARCH_DLINFO_X32 \
+do { \
+ if (vdso64_enabled) \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, \
+ (unsigned long __force)current->mm->context.vdso); \
+ NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \
+} while (0)
+
+#define AT_SYSINFO 32
+
+#define COMPAT_ARCH_DLINFO \
+if (exec->e_machine == EM_X86_64) \
+ ARCH_DLINFO_X32; \
+else if (IS_ENABLED(CONFIG_IA32_EMULATION)) \
+ ARCH_DLINFO_IA32
+
+#define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
+
+#endif /* !CONFIG_X86_32 */
+
+#define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso)
+
+#define VDSO_ENTRY \
+ ((unsigned long)current->mm->context.vdso + \
+ vdso_image_32.sym___kernel_vsyscall)
+
+struct linux_binprm;
+
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
+extern int arch_setup_additional_pages(struct linux_binprm *bprm,
+ int uses_interp);
+extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
+ int uses_interp, bool x32);
+#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
+ compat_arch_setup_additional_pages(bprm, interpreter, \
+ (ex->e_machine == EM_X86_64))
+
+extern bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs);
+
+/* Do not change the values. See get_align_mask() */
+enum align_flags {
+ ALIGN_VA_32 = BIT(0),
+ ALIGN_VA_64 = BIT(1),
+};
+
+struct va_alignment {
+ int flags;
+ unsigned long mask;
+ unsigned long bits;
+} ____cacheline_aligned;
+
+extern struct va_alignment va_align;
+extern unsigned long align_vdso_addr(unsigned long);
+#endif /* _ASM_X86_ELF_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 19:16:05 +0000