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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/binfmt_som.c
downloadvexpress-lsk-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/binfmt_som.c')
-rw-r--r--fs/binfmt_som.c309
1 files changed, 309 insertions, 0 deletions
diff --git a/fs/binfmt_som.c b/fs/binfmt_som.c
new file mode 100644
index 00000000000..227a2682d2b
--- /dev/null
+++ b/fs/binfmt_som.c
@@ -0,0 +1,309 @@
+/*
+ * linux/fs/binfmt_som.c
+ *
+ * These are the functions used to load SOM format executables as used
+ * by HP-UX.
+ *
+ * Copyright 1999 Matthew Wilcox <willy@bofh.ai>
+ * based on binfmt_elf which is
+ * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
+ */
+
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/binfmts.h>
+#include <linux/som.h>
+#include <linux/string.h>
+#include <linux/file.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/shm.h>
+#include <linux/personality.h>
+#include <linux/init.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+
+#include <linux/config.h>
+
+#include <linux/elf.h>
+
+static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
+static int load_som_library(struct file *);
+
+/*
+ * If we don't support core dumping, then supply a NULL so we
+ * don't even try.
+ */
+#if 0
+static int som_core_dump(long signr, struct pt_regs * regs);
+#else
+#define som_core_dump NULL
+#endif
+
+#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
+#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
+#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
+
+static struct linux_binfmt som_format = {
+ .module = THIS_MODULE,
+ .load_binary = load_som_binary,
+ .load_shlib = load_som_library,
+ .core_dump = som_core_dump,
+ .min_coredump = SOM_PAGESIZE
+};
+
+/*
+ * create_som_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 void create_som_tables(struct linux_binprm *bprm)
+{
+ char **argv, **envp;
+ int argc = bprm->argc;
+ int envc = bprm->envc;
+ unsigned long p;
+ unsigned long *sp;
+
+ /* Word-align the stack pointer */
+ sp = (unsigned long *)((bprm->p + 3) & ~3);
+
+ envp = (char **) sp;
+ sp += envc + 1;
+ argv = (char **) sp;
+ sp += argc + 1;
+
+ __put_user((unsigned long) envp,++sp);
+ __put_user((unsigned long) argv,++sp);
+
+ __put_user(argc, ++sp);
+
+ bprm->p = (unsigned long) sp;
+
+ p = current->mm->arg_start;
+ while (argc-- > 0) {
+ __put_user((char *)p,argv++);
+ p += strlen_user((char *)p);
+ }
+ __put_user(NULL, argv);
+ current->mm->arg_end = current->mm->env_start = p;
+ while (envc-- > 0) {
+ __put_user((char *)p,envp++);
+ p += strlen_user((char *)p);
+ }
+ __put_user(NULL, envp);
+ current->mm->env_end = p;
+}
+
+static int check_som_header(struct som_hdr *som_ex)
+{
+ int *buf = (int *)som_ex;
+ int i, ck;
+
+ if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
+ som_ex->system_id != SOM_SID_PARISC_1_1 &&
+ som_ex->system_id != SOM_SID_PARISC_2_0)
+ return -ENOEXEC;
+
+ if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
+ som_ex->a_magic != SOM_EXEC_SHARE &&
+ som_ex->a_magic != SOM_EXEC_DEMAND)
+ return -ENOEXEC;
+
+ if (som_ex->version_id != SOM_ID_OLD &&
+ som_ex->version_id != SOM_ID_NEW)
+ return -ENOEXEC;
+
+ ck = 0;
+ for (i=0; i<32; i++)
+ ck ^= buf[i];
+ if (ck != 0)
+ return -ENOEXEC;
+
+ return 0;
+}
+
+static int map_som_binary(struct file *file,
+ const struct som_exec_auxhdr *hpuxhdr)
+{
+ unsigned long code_start, code_size, data_start, data_size;
+ unsigned long bss_start, som_brk;
+ int retval;
+ int prot = PROT_READ | PROT_EXEC;
+ int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
+
+ mm_segment_t old_fs = get_fs();
+ set_fs(get_ds());
+
+ code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
+ code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
+ current->mm->start_code = code_start;
+ current->mm->end_code = code_start + code_size;
+ down_write(&current->mm->mmap_sem);
+ retval = do_mmap(file, code_start, code_size, prot,
+ flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
+ up_write(&current->mm->mmap_sem);
+ if (retval < 0 && retval > -1024)
+ goto out;
+
+ data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
+ data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
+ current->mm->start_data = data_start;
+ current->mm->end_data = bss_start = data_start + data_size;
+ down_write(&current->mm->mmap_sem);
+ retval = do_mmap(file, data_start, data_size,
+ prot | PROT_WRITE, flags,
+ SOM_PAGESTART(hpuxhdr->exec_dfile));
+ up_write(&current->mm->mmap_sem);
+ if (retval < 0 && retval > -1024)
+ goto out;
+
+ som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
+ current->mm->start_brk = current->mm->brk = som_brk;
+ down_write(&current->mm->mmap_sem);
+ retval = do_mmap(NULL, bss_start, som_brk - bss_start,
+ prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
+ up_write(&current->mm->mmap_sem);
+ if (retval > 0 || retval < -1024)
+ retval = 0;
+out:
+ set_fs(old_fs);
+ return retval;
+}
+
+
+/*
+ * These are the functions used to load SOM executables and shared
+ * libraries. There is no binary dependent code anywhere else.
+ */
+
+static int
+load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
+{
+ int som_exec_fileno;
+ int retval;
+ unsigned int size;
+ unsigned long som_entry;
+ struct som_hdr *som_ex;
+ struct som_exec_auxhdr *hpuxhdr;
+
+ /* Get the exec-header */
+ som_ex = (struct som_hdr *) bprm->buf;
+
+ retval = check_som_header(som_ex);
+ if (retval != 0)
+ goto out;
+
+ /* Now read in the auxiliary header information */
+
+ retval = -ENOMEM;
+ size = som_ex->aux_header_size;
+ if (size > SOM_PAGESIZE)
+ goto out;
+ hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
+ if (!hpuxhdr)
+ goto out;
+
+ retval = kernel_read(bprm->file, som_ex->aux_header_location,
+ (char *) hpuxhdr, size);
+ if (retval < 0)
+ goto out_free;
+#error "Fix security hole before enabling me"
+ retval = get_unused_fd();
+ if (retval < 0)
+ goto out_free;
+ get_file(bprm->file);
+ fd_install(som_exec_fileno = retval, bprm->file);
+
+ /* Flush all traces of the currently running executable */
+ retval = flush_old_exec(bprm);
+ if (retval)
+ goto out_free;
+
+ /* OK, This is the point of no return */
+ current->flags &= ~PF_FORKNOEXEC;
+ current->personality = PER_HPUX;
+
+ /* Set the task size for HP-UX processes such that
+ * the gateway page is outside the address space.
+ * This can be fixed later, but for now, this is much
+ * easier.
+ */
+
+ current->thread.task_size = 0xc0000000;
+
+ /* Set map base to allow enough room for hp-ux heap growth */
+
+ current->thread.map_base = 0x80000000;
+
+ retval = map_som_binary(bprm->file, hpuxhdr);
+ if (retval < 0)
+ goto out_free;
+
+ som_entry = hpuxhdr->exec_entry;
+ kfree(hpuxhdr);
+
+ set_binfmt(&som_format);
+ compute_creds(bprm);
+ setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
+
+ create_som_tables(bprm);
+
+ current->mm->start_stack = bprm->p;
+ set_mm_counter(current->mm, rss, 0);
+
+#if 0
+ printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
+ printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
+ printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
+ printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
+ printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
+ printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
+#endif
+
+ map_hpux_gateway_page(current,current->mm);
+
+ start_thread_som(regs, som_entry, bprm->p);
+ if (current->ptrace & PT_PTRACED)
+ send_sig(SIGTRAP, current, 0);
+ return 0;
+
+ /* error cleanup */
+out_free:
+ kfree(hpuxhdr);
+out:
+ return retval;
+}
+
+static int load_som_library(struct file *f)
+{
+/* No lib support in SOM yet. gizza chance.. */
+ return -ENOEXEC;
+}
+ /* Install the SOM loader.
+ * N.B. We *rely* on the table being the right size with the
+ * right number of free slots...
+ */
+
+static int __init init_som_binfmt(void)
+{
+ return register_binfmt(&som_format);
+}
+
+static void __exit exit_som_binfmt(void)
+{
+ /* Remove the SOM loader. */
+ unregister_binfmt(&som_format);
+}
+
+core_initcall(init_som_binfmt);
+module_exit(exit_som_binfmt);