1 files changed, 424 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/binfmt_aout32.c b/arch/sparc64/kernel/binfmt_aout32.c
new file mode 100644
index 000000000000..b2854ef221d0
--- /dev/null
+++ b/arch/sparc64/kernel/binfmt_aout32.c
@@ -0,0 +1,424 @@
+/*
+ *  linux/fs/binfmt_aout.c
+ *
+ *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
+ *
+ *  Hacked a bit by DaveM to make it work with 32-bit SunOS
+ *  binaries on the sparc64 port.
+ */
+
+#include <linux/module.h>
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/a.out.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/slab.h>
+#include <linux/binfmts.h>
+#include <linux/personality.h>
+#include <linux/init.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+
+static int load_aout32_binary(struct linux_binprm *, struct pt_regs * regs);
+static int load_aout32_library(struct file*);
+static int aout32_core_dump(long signr, struct pt_regs * regs, struct file *file);
+
+extern void dump_thread(struct pt_regs *, struct user *);
+
+static struct linux_binfmt aout32_format = {
+        NULL, THIS_MODULE, load_aout32_binary, load_aout32_library, aout32_core_dump,
+        PAGE_SIZE
+};
+
+static void set_brk(unsigned long start, unsigned long end)
+{
+        start = PAGE_ALIGN(start);
+        end = PAGE_ALIGN(end);
+        if (end <= start)
+                return;
+        down_write(&current->mm->mmap_sem);
+        do_brk(start, end - start);
+        up_write(&current->mm->mmap_sem);
+}
+
+/*
+ * These are the only things you should do on a core-file: use only these
+ * macros to write out all the necessary info.
+ */
+
+static int dump_write(struct file *file, const void *addr, int nr)
+{
+        return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+}
+
+#define DUMP_WRITE(addr, nr)    \
+        if (!dump_write(file, (void *)(addr), (nr))) \
+                goto end_coredump;
+
+#define DUMP_SEEK(offset) \
+if (file->f_op->llseek) { \
+        if (file->f_op->llseek(file,(offset),0) != (offset)) \
+                goto end_coredump; \
+} else file->f_pos = (offset)
+
+/*
+ * Routine writes a core dump image in the current directory.
+ * Currently only a stub-function.
+ *
+ * Note that setuid/setgid files won't make a core-dump if the uid/gid
+ * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
+ * field, which also makes sure the core-dumps won't be recursive if the
+ * dumping of the process results in another error..
+ */
+
+static int aout32_core_dump(long signr, struct pt_regs *regs, struct file *file)
+{
+        mm_segment_t fs;
+        int has_dumped = 0;
+        unsigned long dump_start, dump_size;
+        struct user dump;
+#       define START_DATA(u)    (u.u_tsize)
+#       define START_STACK(u)   ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
+
+        fs = get_fs();
+        set_fs(KERNEL_DS);
+        has_dumped = 1;
+        current->flags |= PF_DUMPCORE;
+        strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
+        dump.signal = signr;
+        dump_thread(regs, &dump);
+
+/* If the size of the dump file exceeds the rlimit, then see what would happen
+   if we wrote the stack, but not the data area.  */
+        if ((dump.u_dsize+dump.u_ssize) >
+            current->signal->rlim[RLIMIT_CORE].rlim_cur)
+                dump.u_dsize = 0;
+
+/* Make sure we have enough room to write the stack and data areas. */
+        if ((dump.u_ssize) >
+            current->signal->rlim[RLIMIT_CORE].rlim_cur)
+                dump.u_ssize = 0;
+
+/* make sure we actually have a data and stack area to dump */
+        set_fs(USER_DS);
+        if (!access_ok(VERIFY_READ, (void __user *) START_DATA(dump), dump.u_dsize))
+                dump.u_dsize = 0;
+        if (!access_ok(VERIFY_READ, (void __user *) START_STACK(dump), dump.u_ssize))
+                dump.u_ssize = 0;
+
+        set_fs(KERNEL_DS);
+/* struct user */
+        DUMP_WRITE(&dump,sizeof(dump));
+/* now we start writing out the user space info */
+        set_fs(USER_DS);
+/* Dump the data area */
+        if (dump.u_dsize != 0) {
+                dump_start = START_DATA(dump);
+                dump_size = dump.u_dsize;
+                DUMP_WRITE(dump_start,dump_size);
+        }
+/* Now prepare to dump the stack area */
+        if (dump.u_ssize != 0) {
+                dump_start = START_STACK(dump);
+                dump_size = dump.u_ssize;
+                DUMP_WRITE(dump_start,dump_size);
+        }
+/* Finally dump the task struct.  Not be used by gdb, but could be useful */
+        set_fs(KERNEL_DS);
+        DUMP_WRITE(current,sizeof(*current));
+end_coredump:
+        set_fs(fs);
+        return has_dumped;
+}
+
+/*
+ * create_aout32_tables() parses the env- and arg-strings in new user
+ * memory and creates the pointer tables from them, and puts their
+ * addresses on the "stack", returning the new stack pointer value.
+ */
+
+static u32 __user *create_aout32_tables(char __user *p, struct linux_binprm *bprm)
+{
+        u32 __user *argv;
+        u32 __user *envp;
+        u32 __user *sp;
+        int argc = bprm->argc;
+        int envc = bprm->envc;
+
+        sp = (u32 __user *)((-(unsigned long)sizeof(char *))&(unsigned long)p);
+
+        /* This imposes the proper stack alignment for a new process. */
+        sp = (u32 __user *) (((unsigned long) sp) & ~7);
+        if ((envc+argc+3)&1)
+                --sp;
+
+        sp -= envc+1;
+        envp = sp;
+        sp -= argc+1;
+        argv = sp;
+        put_user(argc,--sp);
+        current->mm->arg_start = (unsigned long) p;
+        while (argc-->0) {
+                char c;
+                put_user(((u32)(unsigned long)(p)),argv++);
+                do {
+                        get_user(c,p++);
+                } while (c);
+        }
+        put_user(NULL,argv);
+        current->mm->arg_end = current->mm->env_start = (unsigned long) p;
+        while (envc-->0) {
+                char c;
+                put_user(((u32)(unsigned long)(p)),envp++);
+                do {
+                        get_user(c,p++);
+                } while (c);
+        }
+        put_user(NULL,envp);
+        current->mm->env_end = (unsigned long) p;
+        return sp;
+}
+
+/*
+ * These are the functions used to load a.out style executables and shared
+ * libraries.  There is no binary dependent code anywhere else.
+ */
+
+static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
+{
+        struct exec ex;
+        unsigned long error;
+        unsigned long fd_offset;
+        unsigned long rlim;
+        unsigned long orig_thr_flags;
+        int retval;
+
+        ex = *((struct exec *) bprm->buf);              /* exec-header */
+        if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
+             N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
+            N_TRSIZE(ex) || N_DRSIZE(ex) ||
+            bprm->file->f_dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
+                return -ENOEXEC;
+        }
+
+        fd_offset = N_TXTOFF(ex);
+
+        /* Check initial limits. This avoids letting people circumvent
+         * size limits imposed on them by creating programs with large
+         * arrays in the data or bss.
+         */
+        rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
+        if (rlim >= RLIM_INFINITY)
+                rlim = ~0;
+        if (ex.a_data + ex.a_bss > rlim)
+                return -ENOMEM;
+
+        /* Flush all traces of the currently running executable */
+        retval = flush_old_exec(bprm);
+        if (retval)
+                return retval;
+
+        /* OK, This is the point of no return */
+        set_personality(PER_SUNOS);
+
+        current->mm->end_code = ex.a_text +
+                (current->mm->start_code = N_TXTADDR(ex));
+        current->mm->end_data = ex.a_data +
+                (current->mm->start_data = N_DATADDR(ex));
+        current->mm->brk = ex.a_bss +
+                (current->mm->start_brk = N_BSSADDR(ex));
+
+        set_mm_counter(current->mm, rss, 0);
+        current->mm->mmap = NULL;
+        compute_creds(bprm);
+        current->flags &= ~PF_FORKNOEXEC;
+        if (N_MAGIC(ex) == NMAGIC) {
+                loff_t pos = fd_offset;
+                /* Fuck me plenty... */
+                down_write(&current->mm->mmap_sem);     
+                error = do_brk(N_TXTADDR(ex), ex.a_text);
+                up_write(&current->mm->mmap_sem);
+                bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
+                          ex.a_text, &pos);
+                down_write(&current->mm->mmap_sem);
+                error = do_brk(N_DATADDR(ex), ex.a_data);
+                up_write(&current->mm->mmap_sem);
+                bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
+                          ex.a_data, &pos);
+                goto beyond_if;
+        }
+
+        if (N_MAGIC(ex) == OMAGIC) {
+                loff_t pos = fd_offset;
+                down_write(&current->mm->mmap_sem);
+                do_brk(N_TXTADDR(ex) & PAGE_MASK,
+                        ex.a_text+ex.a_data + PAGE_SIZE - 1);
+                up_write(&current->mm->mmap_sem);
+                bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
+                          ex.a_text+ex.a_data, &pos);
+        } else {
+                static unsigned long error_time;
+                if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
+                    (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ)
+                {
+                        printk(KERN_NOTICE "executable not page aligned\n");
+                        error_time = jiffies;
+                }
+
+                if (!bprm->file->f_op->mmap) {
+                        loff_t pos = fd_offset;
+                        down_write(&current->mm->mmap_sem);
+                        do_brk(0, ex.a_text+ex.a_data);
+                        up_write(&current->mm->mmap_sem);
+                        bprm->file->f_op->read(bprm->file,
+                                  (char __user *)N_TXTADDR(ex),
+                                  ex.a_text+ex.a_data, &pos);
+                        goto beyond_if;
+                }
+
+                down_write(&current->mm->mmap_sem);
+                error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
+                        PROT_READ | PROT_EXEC,
+                        MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
+                        fd_offset);
+                up_write(&current->mm->mmap_sem);
+
+                if (error != N_TXTADDR(ex)) {
+                        send_sig(SIGKILL, current, 0);
+                        return error;
+                }
+
+                down_write(&current->mm->mmap_sem);
+                error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
+                                PROT_READ | PROT_WRITE | PROT_EXEC,
+                                MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
+                                fd_offset + ex.a_text);
+                up_write(&current->mm->mmap_sem);
+                if (error != N_DATADDR(ex)) {
+                        send_sig(SIGKILL, current, 0);
+                        return error;
+                }
+        }
+beyond_if:
+        set_binfmt(&aout32_format);
+
+        set_brk(current->mm->start_brk, current->mm->brk);
+
+        /* Make sure STACK_TOP returns the right thing.  */
+        orig_thr_flags = current_thread_info()->flags;
+        current_thread_info()->flags |= _TIF_32BIT;
+
+        retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
+        if (retval < 0) { 
+                current_thread_info()->flags = orig_thr_flags;
+
+                /* Someone check-me: is this error path enough? */ 
+                send_sig(SIGKILL, current, 0); 
+                return retval;
+        }
+
+        current->mm->start_stack =
+                (unsigned long) create_aout32_tables((char __user *)bprm->p, bprm);
+        if (!(orig_thr_flags & _TIF_32BIT)) {
+                unsigned long pgd_cache = get_pgd_cache(current->mm->pgd);
+
+                __asm__ __volatile__("stxa\t%0, [%1] %2\n\t"
+                                     "membar #Sync"
+                                     : /* no outputs */
+                                     : "r" (pgd_cache),
+                                       "r" (TSB_REG), "i" (ASI_DMMU));
+        }
+        start_thread32(regs, ex.a_entry, current->mm->start_stack);
+        if (current->ptrace & PT_PTRACED)
+                send_sig(SIGTRAP, current, 0);
+        return 0;
+}
+
+/* N.B. Move to .h file and use code in fs/binfmt_aout.c? */
+static int load_aout32_library(struct file *file)
+{
+        struct inode * inode;
+        unsigned long bss, start_addr, len;
+        unsigned long error;
+        int retval;
+        struct exec ex;
+
+        inode = file->f_dentry->d_inode;
+
+        retval = -ENOEXEC;
+        error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
+        if (error != sizeof(ex))
+                goto out;
+
+        /* We come in here for the regular a.out style of shared libraries */
+        if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
+            N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
+            inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
+                goto out;
+        }
+
+        if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) &&
+            (N_TXTOFF(ex) < inode->i_sb->s_blocksize)) {
+                printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n");
+                goto out;
+        }
+
+        if (N_FLAGS(ex))
+                goto out;
+
+        /* For  QMAGIC, the starting address is 0x20 into the page.  We mask
+           this off to get the starting address for the page */
+
+        start_addr =  ex.a_entry & 0xfffff000;
+
+        /* Now use mmap to map the library into memory. */
+        down_write(&current->mm->mmap_sem);
+        error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
+                        PROT_READ | PROT_WRITE | PROT_EXEC,
+                        MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
+                        N_TXTOFF(ex));
+        up_write(&current->mm->mmap_sem);
+        retval = error;
+        if (error != start_addr)
+                goto out;
+
+        len = PAGE_ALIGN(ex.a_text + ex.a_data);
+        bss = ex.a_text + ex.a_data + ex.a_bss;
+        if (bss > len) {
+                down_write(&current->mm->mmap_sem);
+                error = do_brk(start_addr + len, bss - len);
+                up_write(&current->mm->mmap_sem);
+                retval = error;
+                if (error != start_addr + len)
+                        goto out;
+        }
+        retval = 0;
+out:
+        return retval;
+}
+
+static int __init init_aout32_binfmt(void)
+{
+        return register_binfmt(&aout32_format);
+}
+
+static void __exit exit_aout32_binfmt(void)
+{
+        unregister_binfmt(&aout32_format);
+}
+
+module_init(init_aout32_binfmt);
+module_exit(exit_aout32_binfmt);