From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: AndrĂ© Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/x86/include/asm/elf.h | 371 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 371 insertions(+) create mode 100644 arch/x86/include/asm/elf.h (limited to 'arch/x86/include/asm/elf.h') diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h new file mode 100644 index 000000000..f161c189c --- /dev/null +++ b/arch/x86/include/asm/elf.h @@ -0,0 +1,371 @@ +#ifndef _ASM_X86_ELF_H +#define _ASM_X86_ELF_H + +/* + * ELF register definitions.. + */ +#include + +#include +#include +#include + +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__ + +typedef struct user_fxsr_struct elf_fpxregset_t; + +#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_NUM 16 + +/* + * 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 + +#ifdef CONFIG_X86_64 +extern unsigned int vdso64_enabled; +#endif +#if defined(CONFIG_X86_32) || defined(CONFIG_COMPAT) +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 + +#ifdef CONFIG_X86_32 +#include + +#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_COMMON(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 & 0xffff; \ + pr_reg[8] = regs->es & 0xffff; \ + pr_reg[9] = regs->fs & 0xffff; \ + pr_reg[11] = regs->orig_ax; \ + pr_reg[12] = regs->ip; \ + pr_reg[13] = regs->cs & 0xffff; \ + pr_reg[14] = regs->flags; \ + pr_reg[15] = regs->sp; \ + pr_reg[16] = regs->ss & 0xffff; \ +} while (0); + +#define ELF_CORE_COPY_REGS(pr_reg, regs) \ +do { \ + ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\ + pr_reg[10] = get_user_gs(regs); \ +} while (0); + +#define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \ +do { \ + ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\ + savesegment(gs, pr_reg[10]); \ +} 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) +{ + /* Commented-out registers are cleared in stub_execve */ + /*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->fs = t->gs = 0; + t->fsindex = t->gsindex = 0; + t->ds = t->es = ds; +} + +#define ELF_PLAT_INIT(_r, load_addr) \ + elf_common_init(¤t->thread, _r, 0) + +#define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ + elf_common_init(¤t->thread, regs, __USER_DS) + +void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp); +#define compat_start_thread start_thread_ia32 + +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] = current->thread.fs; \ + (pr_reg)[22] = current->thread.gs; \ + 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 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. */ + +#define ELF_ET_DYN_BASE (TASK_SIZE / 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[0]) + +/* 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. + */ +#define elf_read_implies_exec(ex, executable_stack) \ + (executable_stack != EXSTACK_DISABLE_X) + +struct task_struct; + +#define ARCH_DLINFO_IA32 \ +do { \ + if (vdso32_enabled) { \ + NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ + NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ + } \ +} while (0) + +#ifdef CONFIG_X86_32 + +#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 (test_thread_flag(TIF_ADDR32) ? 0x7ff : 0x3fffff) + +#define ARCH_DLINFO \ +do { \ + if (vdso64_enabled) \ + NEW_AUX_ENT(AT_SYSINFO_EHDR, \ + (unsigned long __force)current->mm->context.vdso); \ +} 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); \ +} while (0) + +#define AT_SYSINFO 32 + +#define COMPAT_ARCH_DLINFO \ +if (test_thread_flag(TIF_X32)) \ + ARCH_DLINFO_X32; \ +else \ + 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 + \ + selected_vdso32->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); +#define compat_arch_setup_additional_pages compat_arch_setup_additional_pages + +/* + * True on X86_32 or when emulating IA32 on X86_64 + */ +static inline int mmap_is_ia32(void) +{ +#ifdef CONFIG_X86_32 + return 1; +#endif +#ifdef CONFIG_IA32_EMULATION + if (test_thread_flag(TIF_ADDR32)) + return 1; +#endif + return 0; +} + +/* 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 */ -- cgit v1.2.3-54-g00ecf