From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: 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! --- arch/sparc64/kernel/binfmt_aout32.c | 424 ++++++++++++++++++++++++++++++++++++ 1 file changed, 424 insertions(+) create mode 100644 arch/sparc64/kernel/binfmt_aout32.c (limited to 'arch/sparc64/kernel/binfmt_aout32.c') diff --git a/arch/sparc64/kernel/binfmt_aout32.c b/arch/sparc64/kernel/binfmt_aout32.c new file mode 100644 index 00000000000..b2854ef221d --- /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 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +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(¤t->mm->mmap_sem); + do_brk(start, end - start); + up_write(¤t->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(¤t->mm->mmap_sem); + error = do_brk(N_TXTADDR(ex), ex.a_text); + up_write(¤t->mm->mmap_sem); + bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex), + ex.a_text, &pos); + down_write(¤t->mm->mmap_sem); + error = do_brk(N_DATADDR(ex), ex.a_data); + up_write(¤t->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(¤t->mm->mmap_sem); + do_brk(N_TXTADDR(ex) & PAGE_MASK, + ex.a_text+ex.a_data + PAGE_SIZE - 1); + up_write(¤t->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(¤t->mm->mmap_sem); + do_brk(0, ex.a_text+ex.a_data); + up_write(¤t->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(¤t->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(¤t->mm->mmap_sem); + + if (error != N_TXTADDR(ex)) { + send_sig(SIGKILL, current, 0); + return error; + } + + down_write(¤t->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(¤t->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(¤t->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(¤t->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(¤t->mm->mmap_sem); + error = do_brk(start_addr + len, bss - len); + up_write(¤t->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); -- cgit v1.2.3