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-rw-r--r--arch/x86_64/ia32/ia32_binfmt.c434
1 files changed, 434 insertions, 0 deletions
diff --git a/arch/x86_64/ia32/ia32_binfmt.c b/arch/x86_64/ia32/ia32_binfmt.c
new file mode 100644
index 00000000000..93d568dfa76
--- /dev/null
+++ b/arch/x86_64/ia32/ia32_binfmt.c
@@ -0,0 +1,434 @@
+/*
+ * Written 2000,2002 by Andi Kleen.
+ *
+ * Loosely based on the sparc64 and IA64 32bit emulation loaders.
+ * This tricks binfmt_elf.c into loading 32bit binaries using lots
+ * of ugly preprocessor tricks. Talk about very very poor man's inheritance.
+ */
+#include <linux/types.h>
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/rwsem.h>
+#include <linux/sched.h>
+#include <linux/compat.h>
+#include <linux/string.h>
+#include <linux/binfmts.h>
+#include <linux/mm.h>
+#include <linux/security.h>
+
+#include <asm/segment.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/user32.h>
+#include <asm/sigcontext32.h>
+#include <asm/fpu32.h>
+#include <asm/i387.h>
+#include <asm/uaccess.h>
+#include <asm/ia32.h>
+#include <asm/vsyscall32.h>
+
+#define ELF_NAME "elf/i386"
+
+#define AT_SYSINFO 32
+#define AT_SYSINFO_EHDR 33
+
+int sysctl_vsyscall32 = 1;
+
+#define ARCH_DLINFO do { \
+ if (sysctl_vsyscall32) { \
+ NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
+ } \
+} while(0)
+
+struct file;
+struct elf_phdr;
+
+#define IA32_EMULATOR 1
+
+#define ELF_ET_DYN_BASE (TASK_UNMAPPED_32 + 0x1000000)
+
+#undef ELF_ARCH
+#define ELF_ARCH EM_386
+
+#undef ELF_CLASS
+#define ELF_CLASS ELFCLASS32
+
+#define ELF_DATA ELFDATA2LSB
+
+#define USE_ELF_CORE_DUMP 1
+
+/* Overwrite elfcore.h */
+#define _LINUX_ELFCORE_H 1
+typedef unsigned int elf_greg_t;
+
+#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/*
+ * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
+ * extra segments containing the vsyscall DSO contents. Dumping its
+ * contents makes post-mortem fully interpretable later without matching up
+ * the same kernel and hardware config to see what PC values meant.
+ * Dumping its extra ELF program headers includes all the other information
+ * a debugger needs to easily find how the vsyscall DSO was being used.
+ */
+#define ELF_CORE_EXTRA_PHDRS (VSYSCALL32_EHDR->e_phnum)
+#define ELF_CORE_WRITE_EXTRA_PHDRS \
+do { \
+ const struct elf32_phdr *const vsyscall_phdrs = \
+ (const struct elf32_phdr *) (VSYSCALL32_BASE \
+ + VSYSCALL32_EHDR->e_phoff); \
+ int i; \
+ Elf32_Off ofs = 0; \
+ for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
+ struct elf32_phdr phdr = vsyscall_phdrs[i]; \
+ if (phdr.p_type == PT_LOAD) { \
+ BUG_ON(ofs != 0); \
+ ofs = phdr.p_offset = offset; \
+ phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \
+ phdr.p_filesz = phdr.p_memsz; \
+ offset += phdr.p_filesz; \
+ } \
+ else \
+ phdr.p_offset += ofs; \
+ phdr.p_paddr = 0; /* match other core phdrs */ \
+ DUMP_WRITE(&phdr, sizeof(phdr)); \
+ } \
+} while (0)
+#define ELF_CORE_WRITE_EXTRA_DATA \
+do { \
+ const struct elf32_phdr *const vsyscall_phdrs = \
+ (const struct elf32_phdr *) (VSYSCALL32_BASE \
+ + VSYSCALL32_EHDR->e_phoff); \
+ int i; \
+ for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
+ if (vsyscall_phdrs[i].p_type == PT_LOAD) \
+ DUMP_WRITE((void *) (u64) vsyscall_phdrs[i].p_vaddr, \
+ PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \
+ } \
+} while (0)
+
+struct elf_siginfo
+{
+ int si_signo; /* signal number */
+ int si_code; /* extra code */
+ int si_errno; /* errno */
+};
+
+#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
+
+struct elf_prstatus
+{
+ struct elf_siginfo pr_info; /* Info associated with signal */
+ short pr_cursig; /* Current signal */
+ unsigned int pr_sigpend; /* Set of pending signals */
+ unsigned int pr_sighold; /* Set of held signals */
+ pid_t pr_pid;
+ pid_t pr_ppid;
+ pid_t pr_pgrp;
+ pid_t pr_sid;
+ struct compat_timeval pr_utime; /* User time */
+ struct compat_timeval pr_stime; /* System time */
+ struct compat_timeval pr_cutime; /* Cumulative user time */
+ struct compat_timeval pr_cstime; /* Cumulative system time */
+ elf_gregset_t pr_reg; /* GP registers */
+ int pr_fpvalid; /* True if math co-processor being used. */
+};
+
+#define ELF_PRARGSZ (80) /* Number of chars for args */
+
+struct elf_prpsinfo
+{
+ char pr_state; /* numeric process state */
+ char pr_sname; /* char for pr_state */
+ char pr_zomb; /* zombie */
+ char pr_nice; /* nice val */
+ unsigned int pr_flag; /* flags */
+ __u16 pr_uid;
+ __u16 pr_gid;
+ pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
+ /* Lots missing */
+ char pr_fname[16]; /* filename of executable */
+ char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
+};
+
+#define __STR(x) #x
+#define STR(x) __STR(x)
+
+#define _GET_SEG(x) \
+ ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
+
+/* Assumes current==process to be dumped */
+#define ELF_CORE_COPY_REGS(pr_reg, regs) \
+ pr_reg[0] = regs->rbx; \
+ pr_reg[1] = regs->rcx; \
+ pr_reg[2] = regs->rdx; \
+ pr_reg[3] = regs->rsi; \
+ pr_reg[4] = regs->rdi; \
+ pr_reg[5] = regs->rbp; \
+ pr_reg[6] = regs->rax; \
+ pr_reg[7] = _GET_SEG(ds); \
+ pr_reg[8] = _GET_SEG(es); \
+ pr_reg[9] = _GET_SEG(fs); \
+ pr_reg[10] = _GET_SEG(gs); \
+ pr_reg[11] = regs->orig_rax; \
+ pr_reg[12] = regs->rip; \
+ pr_reg[13] = regs->cs; \
+ pr_reg[14] = regs->eflags; \
+ pr_reg[15] = regs->rsp; \
+ pr_reg[16] = regs->ss;
+
+#define user user32
+
+#define __ASM_X86_64_ELF_H 1
+#define elf_read_implies_exec(ex, have_pt_gnu_stack) (!(have_pt_gnu_stack))
+//#include <asm/ia32.h>
+#include <linux/elf.h>
+
+typedef struct user_i387_ia32_struct elf_fpregset_t;
+typedef struct user32_fxsr_struct elf_fpxregset_t;
+
+
+static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
+{
+ ELF_CORE_COPY_REGS((*elfregs), regs)
+}
+
+static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
+{
+ struct pt_regs *pp = (struct pt_regs *)(t->thread.rsp0);
+ --pp;
+ ELF_CORE_COPY_REGS((*elfregs), pp);
+ /* fix wrong segments */
+ (*elfregs)[7] = t->thread.ds;
+ (*elfregs)[9] = t->thread.fsindex;
+ (*elfregs)[10] = t->thread.gsindex;
+ (*elfregs)[8] = t->thread.es;
+ return 1;
+}
+
+static inline int
+elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu)
+{
+ struct _fpstate_ia32 *fpstate = (void*)fpu;
+ mm_segment_t oldfs = get_fs();
+
+ if (!tsk_used_math(tsk))
+ return 0;
+ if (!regs)
+ regs = (struct pt_regs *)tsk->thread.rsp0;
+ --regs;
+ if (tsk == current)
+ unlazy_fpu(tsk);
+ set_fs(KERNEL_DS);
+ save_i387_ia32(tsk, fpstate, regs, 1);
+ /* Correct for i386 bug. It puts the fop into the upper 16bits of
+ the tag word (like FXSAVE), not into the fcs*/
+ fpstate->cssel |= fpstate->tag & 0xffff0000;
+ set_fs(oldfs);
+ return 1;
+}
+
+#define ELF_CORE_COPY_XFPREGS 1
+static inline int
+elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
+{
+ struct pt_regs *regs = ((struct pt_regs *)(t->thread.rsp0))-1;
+ if (!tsk_used_math(t))
+ return 0;
+ if (t == current)
+ unlazy_fpu(t);
+ memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
+ xfpu->fcs = regs->cs;
+ xfpu->fos = t->thread.ds; /* right? */
+ return 1;
+}
+
+#undef elf_check_arch
+#define elf_check_arch(x) \
+ ((x)->e_machine == EM_386)
+
+extern int force_personality32;
+
+#define ELF_EXEC_PAGESIZE PAGE_SIZE
+#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
+#define ELF_PLATFORM ("i686")
+#define SET_PERSONALITY(ex, ibcs2) \
+do { \
+ unsigned long new_flags = 0; \
+ if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
+ new_flags = _TIF_IA32; \
+ if ((current_thread_info()->flags & _TIF_IA32) \
+ != new_flags) \
+ set_thread_flag(TIF_ABI_PENDING); \
+ else \
+ clear_thread_flag(TIF_ABI_PENDING); \
+ /* XXX This overwrites the user set personality */ \
+ current->personality |= force_personality32; \
+} while (0)
+
+/* Override some function names */
+#define elf_format elf32_format
+
+#define init_elf_binfmt init_elf32_binfmt
+#define exit_elf_binfmt exit_elf32_binfmt
+
+#define load_elf_binary load_elf32_binary
+
+#define ELF_PLAT_INIT(r, load_addr) elf32_init(r)
+#define setup_arg_pages(bprm, stack_top, exec_stack) \
+ ia32_setup_arg_pages(bprm, stack_top, exec_stack)
+int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack);
+
+#undef start_thread
+#define start_thread(regs,new_rip,new_rsp) do { \
+ asm volatile("movl %0,%%fs" :: "r" (0)); \
+ asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
+ load_gs_index(0); \
+ (regs)->rip = (new_rip); \
+ (regs)->rsp = (new_rsp); \
+ (regs)->eflags = 0x200; \
+ (regs)->cs = __USER32_CS; \
+ (regs)->ss = __USER32_DS; \
+ set_fs(USER_DS); \
+} while(0)
+
+
+#define elf_map elf32_map
+
+#include <linux/module.h>
+
+MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
+MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
+
+#undef MODULE_DESCRIPTION
+#undef MODULE_AUTHOR
+
+#define elf_addr_t __u32
+
+#undef TASK_SIZE
+#define TASK_SIZE 0xffffffff
+
+static void elf32_init(struct pt_regs *);
+
+#include "../../../fs/binfmt_elf.c"
+
+static void elf32_init(struct pt_regs *regs)
+{
+ struct task_struct *me = current;
+ regs->rdi = 0;
+ regs->rsi = 0;
+ regs->rdx = 0;
+ regs->rcx = 0;
+ regs->rax = 0;
+ regs->rbx = 0;
+ regs->rbp = 0;
+ regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
+ regs->r13 = regs->r14 = regs->r15 = 0;
+ me->thread.fs = 0;
+ me->thread.gs = 0;
+ me->thread.fsindex = 0;
+ me->thread.gsindex = 0;
+ me->thread.ds = __USER_DS;
+ me->thread.es = __USER_DS;
+}
+
+int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack)
+{
+ unsigned long stack_base;
+ struct vm_area_struct *mpnt;
+ struct mm_struct *mm = current->mm;
+ int i, ret;
+
+ stack_base = IA32_STACK_TOP - MAX_ARG_PAGES * PAGE_SIZE;
+ mm->arg_start = bprm->p + stack_base;
+
+ bprm->p += stack_base;
+ if (bprm->loader)
+ bprm->loader += stack_base;
+ bprm->exec += stack_base;
+
+ mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
+ if (!mpnt)
+ return -ENOMEM;
+
+ if (security_vm_enough_memory((IA32_STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))>>PAGE_SHIFT)) {
+ kmem_cache_free(vm_area_cachep, mpnt);
+ return -ENOMEM;
+ }
+
+ memset(mpnt, 0, sizeof(*mpnt));
+
+ down_write(&mm->mmap_sem);
+ {
+ mpnt->vm_mm = mm;
+ mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
+ mpnt->vm_end = IA32_STACK_TOP;
+ if (executable_stack == EXSTACK_ENABLE_X)
+ mpnt->vm_flags = VM_STACK_FLAGS | VM_EXEC;
+ else if (executable_stack == EXSTACK_DISABLE_X)
+ mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
+ else
+ mpnt->vm_flags = VM_STACK_FLAGS;
+ mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ?
+ PAGE_COPY_EXEC : PAGE_COPY;
+ if ((ret = insert_vm_struct(mm, mpnt))) {
+ up_write(&mm->mmap_sem);
+ kmem_cache_free(vm_area_cachep, mpnt);
+ return ret;
+ }
+ mm->stack_vm = mm->total_vm = vma_pages(mpnt);
+ }
+
+ for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
+ struct page *page = bprm->page[i];
+ if (page) {
+ bprm->page[i] = NULL;
+ install_arg_page(mpnt, page, stack_base);
+ }
+ stack_base += PAGE_SIZE;
+ }
+ up_write(&mm->mmap_sem);
+
+ return 0;
+}
+
+static unsigned long
+elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type)
+{
+ unsigned long map_addr;
+ struct task_struct *me = current;
+
+ down_write(&me->mm->mmap_sem);
+ map_addr = do_mmap(filep, ELF_PAGESTART(addr),
+ eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot,
+ type,
+ eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
+ up_write(&me->mm->mmap_sem);
+ return(map_addr);
+}
+
+#ifdef CONFIG_SYSCTL
+/* Register vsyscall32 into the ABI table */
+#include <linux/sysctl.h>
+
+static ctl_table abi_table2[] = {
+ { 99, "vsyscall32", &sysctl_vsyscall32, sizeof(int), 0644, NULL,
+ proc_dointvec },
+ { 0, }
+};
+
+static ctl_table abi_root_table2[] = {
+ { .ctl_name = CTL_ABI, .procname = "abi", .mode = 0555,
+ .child = abi_table2 },
+ { 0 },
+};
+
+static __init int ia32_binfmt_init(void)
+{
+ register_sysctl_table(abi_root_table2, 1);
+ return 0;
+}
+__initcall(ia32_binfmt_init);
+#endif
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