1 files changed, 320 insertions, 0 deletions
diff --git a/arch/x86/ia32/ia32_binfmt.c b/arch/x86/ia32/ia32_binfmt.c
new file mode 100644
index 000000000000..dffd2ac72747
--- /dev/null
+++ b/arch/x86/ia32/ia32_binfmt.c
@@ -0,0 +1,320 @@
+/* 
+ * 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.
+ */ 
+#define __ASM_X86_64_ELF_H 1
+
+#undef ELF_CLASS
+#define ELF_CLASS ELFCLASS32
+
+#include <linux/types.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;
+
+#undef ARCH_DLINFO
+#define ARCH_DLINFO do {  \
+	if (sysctl_vsyscall32) { \
+		current->mm->context.vdso = (void *)VSYSCALL32_BASE;	\
+		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_BASE + 0x1000000)
+
+#undef ELF_ARCH
+#define ELF_ARCH EM_386
+
+#define ELF_DATA	ELFDATA2LSB
+
+#define USE_ELF_CORE_DUMP 1
+
+/* Override 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];
+
+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
+
+#undef elf_read_implies_exec
+#define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)
+//#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 = task_pt_regs(t);
+	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 = task_pt_regs(tsk);
+	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 = task_pt_regs(t);
+	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)
+
+#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) 
+
+
+#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
+
+static void elf32_init(struct pt_regs *);
+
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
+#define arch_setup_additional_pages syscall32_setup_pages
+extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
+
+#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;
+}
+
+#ifdef CONFIG_SYSCTL
+/* Register vsyscall32 into the ABI table */
+#include <linux/sysctl.h>
+
+static ctl_table abi_table2[] = {
+	{
+		.ctl_name	= 99,
+		.procname	= "vsyscall32",
+		.data		= &sysctl_vsyscall32,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
+	{}
+};
+
+static ctl_table abi_root_table2[] = {
+	{
+		.ctl_name = CTL_ABI,
+		.procname = "abi",
+		.mode = 0555,
+		.child = abi_table2
+	},
+	{}
+};
+
+static __init int ia32_binfmt_init(void)
+{ 
+	register_sysctl_table(abi_root_table2);
+	return 0;
+}
+__initcall(ia32_binfmt_init);
+#endif