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linux/arch/frv/kernel/ptrace.c
David Howells 8feae13110 NOMMU: Make VMAs per MM as for MMU-mode linux 
Make VMAs per mm_struct as for MMU-mode linux.  This solves two problems:

 (1) In SYSV SHM where nattch for a segment does not reflect the number of
     shmat's (and forks) done.

 (2) In mmap() where the VMA's vm_mm is set to point to the parent mm by an
     exec'ing process when VM_EXECUTABLE is specified, regardless of the fact
     that a VMA might be shared and already have its vm_mm assigned to another
     process or a dead process.

A new struct (vm_region) is introduced to track a mapped region and to remember
the circumstances under which it may be shared and the vm_list_struct structure
is discarded as it's no longer required.

This patch makes the following additional changes:

 (1) Regions are now allocated with alloc_pages() rather than kmalloc() and
     with no recourse to __GFP_COMP, so the pages are not composite.  Instead,
     each page has a reference on it held by the region.  Anything else that is
     interested in such a page will have to get a reference on it to retain it.
     When the pages are released due to unmapping, each page is passed to
     put_page() and will be freed when the page usage count reaches zero.

 (2) Excess pages are trimmed after an allocation as the allocation must be
     made as a power-of-2 quantity of pages.

 (3) VMAs are added to the parent MM's R/B tree and mmap lists.  As an MM may
     end up with overlapping VMAs within the tree, the VMA struct address is
     appended to the sort key.

 (4) Non-anonymous VMAs are now added to the backing inode's prio list.

 (5) Holes may be punched in anonymous VMAs with munmap(), releasing parts of
     the backing region.  The VMA and region structs will be split if
     necessary.

 (6) sys_shmdt() only releases one attachment to a SYSV IPC shared memory
     segment instead of all the attachments at that addresss.  Multiple
     shmat()'s return the same address under NOMMU-mode instead of different
     virtual addresses as under MMU-mode.

 (7) Core dumping for ELF-FDPIC requires fewer exceptions for NOMMU-mode.

 (8) /proc/maps is now the global list of mapped regions, and may list bits
     that aren't actually mapped anywhere.

 (9) /proc/meminfo gains a line (tagged "MmapCopy") that indicates the amount
     of RAM currently allocated by mmap to hold mappable regions that can't be
     mapped directly.  These are copies of the backing device or file if not
     anonymous.

These changes make NOMMU mode more similar to MMU mode.  The downside is that
NOMMU mode requires some extra memory to track things over NOMMU without this
patch (VMAs are no longer shared, and there are now region structs).

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Mike Frysinger <vapier.adi@gmail.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
2009-01-08 12:04:47 +00:00

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/* ptrace.c: FRV specific parts of process tracing
*
* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
* - Derived from arch/m68k/kernel/ptrace.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/security.h>
#include <linux/signal.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/unistd.h>
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
/*
* Get contents of register REGNO in task TASK.
*/
static inline long get_reg(struct task_struct *task, int regno)
{
struct user_context *user = task->thread.user;
if (regno < 0 || regno >= PT__END)
return 0;
return ((unsigned long *) user)[regno];
}
/*
* Write contents of register REGNO in task TASK.
*/
static inline int put_reg(struct task_struct *task, int regno,
unsigned long data)
{
struct user_context *user = task->thread.user;
if (regno < 0 || regno >= PT__END)
return -EIO;
switch (regno) {
case PT_GR(0):
return 0;
case PT_PSR:
case PT__STATUS:
return -EIO;
default:
((unsigned long *) user)[regno] = data;
return 0;
}
}
/*
* check that an address falls within the bounds of the target process's memory
* mappings
*/
static inline int is_user_addr_valid(struct task_struct *child,
unsigned long start, unsigned long len)
{
#ifdef CONFIG_MMU
if (start >= PAGE_OFFSET || len > PAGE_OFFSET - start)
return -EIO;
return 0;
#else
struct vm_area_struct *vma;
vma = find_vma(child->mm, start);
if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
return 0;
return -EIO;
#endif
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Control h/w single stepping
*/
void ptrace_disable(struct task_struct *child)
{
child->thread.frame0->__status &= ~REG__STATUS_STEP;
}
void ptrace_enable(struct task_struct *child)
{
child->thread.frame0->__status |= REG__STATUS_STEP;
}
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
unsigned long tmp;
int ret;
switch (request) {
/* when I and D space are separate, these will need to be fixed. */
case PTRACE_PEEKTEXT: /* read word at location addr. */
case PTRACE_PEEKDATA:
ret = -EIO;
if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
break;
ret = generic_ptrace_peekdata(child, addr, data);
break;
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR: {
tmp = 0;
ret = -EIO;
if ((addr & 3) || addr < 0)
break;
ret = 0;
switch (addr >> 2) {
case 0 ... PT__END - 1:
tmp = get_reg(child, addr >> 2);
break;
case PT__END + 0:
tmp = child->mm->end_code - child->mm->start_code;
break;
case PT__END + 1:
tmp = child->mm->end_data - child->mm->start_data;
break;
case PT__END + 2:
tmp = child->mm->start_stack - child->mm->start_brk;
break;
case PT__END + 3:
tmp = child->mm->start_code;
break;
case PT__END + 4:
tmp = child->mm->start_stack;
break;
default:
ret = -EIO;
break;
}
if (ret == 0)
ret = put_user(tmp, (unsigned long *) data);
break;
}
/* when I and D space are separate, this will have to be fixed. */
case PTRACE_POKETEXT: /* write the word at location addr. */
case PTRACE_POKEDATA:
ret = -EIO;
if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
break;
ret = generic_ptrace_pokedata(child, addr, data);
break;
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
ret = -EIO;
if ((addr & 3) || addr < 0)
break;
ret = 0;
switch (addr >> 2) {
case 0 ... PT__END-1:
ret = put_reg(child, addr >> 2, data);
break;
default:
ret = -EIO;
break;
}
break;
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
case PTRACE_CONT: /* restart after signal. */
ret = -EIO;
if (!valid_signal(data))
break;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
ptrace_disable(child);
wake_up_process(child);
ret = 0;
break;
/* make the child exit. Best I can do is send it a sigkill.
* perhaps it should be put in the status that it wants to
* exit.
*/
case PTRACE_KILL:
ret = 0;
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
child->exit_code = SIGKILL;
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
ptrace_disable(child);
wake_up_process(child);
break;
case PTRACE_SINGLESTEP: /* set the trap flag. */
ret = -EIO;
if (!valid_signal(data))
break;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
ptrace_enable(child);
child->exit_code = data;
wake_up_process(child);
ret = 0;
break;
case PTRACE_DETACH: /* detach a process that was attached. */
ret = ptrace_detach(child, data);
break;
case PTRACE_GETREGS: { /* Get all integer regs from the child. */
int i;
for (i = 0; i < PT__GPEND; i++) {
tmp = get_reg(child, i);
if (put_user(tmp, (unsigned long *) data)) {
ret = -EFAULT;
break;
}
data += sizeof(long);
}
ret = 0;
break;
}
case PTRACE_SETREGS: { /* Set all integer regs in the child. */
int i;
for (i = 0; i < PT__GPEND; i++) {
if (get_user(tmp, (unsigned long *) data)) {
ret = -EFAULT;
break;
}
put_reg(child, i, tmp);
data += sizeof(long);
}
ret = 0;
break;
}
case PTRACE_GETFPREGS: { /* Get the child FP/Media state. */
ret = 0;
if (copy_to_user((void *) data,
&child->thread.user->f,
sizeof(child->thread.user->f)))
ret = -EFAULT;
break;
}
case PTRACE_SETFPREGS: { /* Set the child FP/Media state. */
ret = 0;
if (copy_from_user(&child->thread.user->f,
(void *) data,
sizeof(child->thread.user->f)))
ret = -EFAULT;
break;
}
case PTRACE_GETFDPIC:
tmp = 0;
switch (addr) {
case PTRACE_GETFDPIC_EXEC:
tmp = child->mm->context.exec_fdpic_loadmap;
break;
case PTRACE_GETFDPIC_INTERP:
tmp = child->mm->context.interp_fdpic_loadmap;
break;
default:
break;
}
ret = 0;
if (put_user(tmp, (unsigned long *) data)) {
ret = -EFAULT;
break;
}
break;
default:
ret = -EIO;
break;
}
return ret;
}
int __nongprelbss kstrace;
static const struct {
const char *name;
unsigned argmask;
} __syscall_name_table[NR_syscalls] = {
[0] = { "restart_syscall" },
[1] = { "exit", 0x000001 },
[2] = { "fork", 0xffffff },
[3] = { "read", 0x000141 },
[4] = { "write", 0x000141 },
[5] = { "open", 0x000235 },
[6] = { "close", 0x000001 },
[7] = { "waitpid", 0x000141 },
[8] = { "creat", 0x000025 },
[9] = { "link", 0x000055 },
[10] = { "unlink", 0x000005 },
[11] = { "execve", 0x000445 },
[12] = { "chdir", 0x000005 },
[13] = { "time", 0x000004 },
[14] = { "mknod", 0x000325 },
[15] = { "chmod", 0x000025 },
[16] = { "lchown", 0x000025 },
[17] = { "break" },
[18] = { "oldstat", 0x000045 },
[19] = { "lseek", 0x000131 },
[20] = { "getpid", 0xffffff },
[21] = { "mount", 0x043555 },
[22] = { "umount", 0x000005 },
[23] = { "setuid", 0x000001 },
[24] = { "getuid", 0xffffff },
[25] = { "stime", 0x000004 },
[26] = { "ptrace", 0x004413 },
[27] = { "alarm", 0x000001 },
[28] = { "oldfstat", 0x000041 },
[29] = { "pause", 0xffffff },
[30] = { "utime", 0x000045 },
[31] = { "stty" },
[32] = { "gtty" },
[33] = { "access", 0x000025 },
[34] = { "nice", 0x000001 },
[35] = { "ftime" },
[36] = { "sync", 0xffffff },
[37] = { "kill", 0x000011 },
[38] = { "rename", 0x000055 },
[39] = { "mkdir", 0x000025 },
[40] = { "rmdir", 0x000005 },
[41] = { "dup", 0x000001 },
[42] = { "pipe", 0x000004 },
[43] = { "times", 0x000004 },
[44] = { "prof" },
[45] = { "brk", 0x000004 },
[46] = { "setgid", 0x000001 },
[47] = { "getgid", 0xffffff },
[48] = { "signal", 0x000041 },
[49] = { "geteuid", 0xffffff },
[50] = { "getegid", 0xffffff },
[51] = { "acct", 0x000005 },
[52] = { "umount2", 0x000035 },
[53] = { "lock" },
[54] = { "ioctl", 0x000331 },
[55] = { "fcntl", 0x000331 },
[56] = { "mpx" },
[57] = { "setpgid", 0x000011 },
[58] = { "ulimit" },
[60] = { "umask", 0x000002 },
[61] = { "chroot", 0x000005 },
[62] = { "ustat", 0x000043 },
[63] = { "dup2", 0x000011 },
[64] = { "getppid", 0xffffff },
[65] = { "getpgrp", 0xffffff },
[66] = { "setsid", 0xffffff },
[67] = { "sigaction" },
[68] = { "sgetmask" },
[69] = { "ssetmask" },
[70] = { "setreuid" },
[71] = { "setregid" },
[72] = { "sigsuspend" },
[73] = { "sigpending" },
[74] = { "sethostname" },
[75] = { "setrlimit" },
[76] = { "getrlimit" },
[77] = { "getrusage" },
[78] = { "gettimeofday" },
[79] = { "settimeofday" },
[80] = { "getgroups" },
[81] = { "setgroups" },
[82] = { "select" },
[83] = { "symlink" },
[84] = { "oldlstat" },
[85] = { "readlink" },
[86] = { "uselib" },
[87] = { "swapon" },
[88] = { "reboot" },
[89] = { "readdir" },
[91] = { "munmap", 0x000034 },
[92] = { "truncate" },
[93] = { "ftruncate" },
[94] = { "fchmod" },
[95] = { "fchown" },
[96] = { "getpriority" },
[97] = { "setpriority" },
[99] = { "statfs" },
[100] = { "fstatfs" },
[102] = { "socketcall" },
[103] = { "syslog" },
[104] = { "setitimer" },
[105] = { "getitimer" },
[106] = { "stat" },
[107] = { "lstat" },
[108] = { "fstat" },
[111] = { "vhangup" },
[114] = { "wait4" },
[115] = { "swapoff" },
[116] = { "sysinfo" },
[117] = { "ipc" },
[118] = { "fsync" },
[119] = { "sigreturn" },
[120] = { "clone" },
[121] = { "setdomainname" },
[122] = { "uname" },
[123] = { "modify_ldt" },
[123] = { "cacheflush" },
[124] = { "adjtimex" },
[125] = { "mprotect" },
[126] = { "sigprocmask" },
[127] = { "create_module" },
[128] = { "init_module" },
[129] = { "delete_module" },
[130] = { "get_kernel_syms" },
[131] = { "quotactl" },
[132] = { "getpgid" },
[133] = { "fchdir" },
[134] = { "bdflush" },
[135] = { "sysfs" },
[136] = { "personality" },
[137] = { "afs_syscall" },
[138] = { "setfsuid" },
[139] = { "setfsgid" },
[140] = { "_llseek", 0x014331 },
[141] = { "getdents" },
[142] = { "_newselect", 0x000141 },
[143] = { "flock" },
[144] = { "msync" },
[145] = { "readv" },
[146] = { "writev" },
[147] = { "getsid", 0x000001 },
[148] = { "fdatasync", 0x000001 },
[149] = { "_sysctl", 0x000004 },
[150] = { "mlock" },
[151] = { "munlock" },
[152] = { "mlockall" },
[153] = { "munlockall" },
[154] = { "sched_setparam" },
[155] = { "sched_getparam" },
[156] = { "sched_setscheduler" },
[157] = { "sched_getscheduler" },
[158] = { "sched_yield" },
[159] = { "sched_get_priority_max" },
[160] = { "sched_get_priority_min" },
[161] = { "sched_rr_get_interval" },
[162] = { "nanosleep", 0x000044 },
[163] = { "mremap" },
[164] = { "setresuid" },
[165] = { "getresuid" },
[166] = { "vm86" },
[167] = { "query_module" },
[168] = { "poll" },
[169] = { "nfsservctl" },
[170] = { "setresgid" },
[171] = { "getresgid" },
[172] = { "prctl", 0x333331 },
[173] = { "rt_sigreturn", 0xffffff },
[174] = { "rt_sigaction", 0x001441 },
[175] = { "rt_sigprocmask", 0x001441 },
[176] = { "rt_sigpending", 0x000014 },
[177] = { "rt_sigtimedwait", 0x001444 },
[178] = { "rt_sigqueueinfo", 0x000411 },
[179] = { "rt_sigsuspend", 0x000014 },
[180] = { "pread", 0x003341 },
[181] = { "pwrite", 0x003341 },
[182] = { "chown", 0x000115 },
[183] = { "getcwd" },
[184] = { "capget" },
[185] = { "capset" },
[186] = { "sigaltstack" },
[187] = { "sendfile" },
[188] = { "getpmsg" },
[189] = { "putpmsg" },
[190] = { "vfork", 0xffffff },
[191] = { "ugetrlimit" },
[192] = { "mmap2", 0x313314 },
[193] = { "truncate64" },
[194] = { "ftruncate64" },
[195] = { "stat64", 0x000045 },
[196] = { "lstat64", 0x000045 },
[197] = { "fstat64", 0x000041 },
[198] = { "lchown32" },
[199] = { "getuid32", 0xffffff },
[200] = { "getgid32", 0xffffff },
[201] = { "geteuid32", 0xffffff },
[202] = { "getegid32", 0xffffff },
[203] = { "setreuid32" },
[204] = { "setregid32" },
[205] = { "getgroups32" },
[206] = { "setgroups32" },
[207] = { "fchown32" },
[208] = { "setresuid32" },
[209] = { "getresuid32" },
[210] = { "setresgid32" },
[211] = { "getresgid32" },
[212] = { "chown32" },
[213] = { "setuid32" },
[214] = { "setgid32" },
[215] = { "setfsuid32" },
[216] = { "setfsgid32" },
[217] = { "pivot_root" },
[218] = { "mincore" },
[219] = { "madvise" },
[220] = { "getdents64" },
[221] = { "fcntl64" },
[223] = { "security" },
[224] = { "gettid" },
[225] = { "readahead" },
[226] = { "setxattr" },
[227] = { "lsetxattr" },
[228] = { "fsetxattr" },
[229] = { "getxattr" },
[230] = { "lgetxattr" },
[231] = { "fgetxattr" },
[232] = { "listxattr" },
[233] = { "llistxattr" },
[234] = { "flistxattr" },
[235] = { "removexattr" },
[236] = { "lremovexattr" },
[237] = { "fremovexattr" },
[238] = { "tkill" },
[239] = { "sendfile64" },
[240] = { "futex" },
[241] = { "sched_setaffinity" },
[242] = { "sched_getaffinity" },
[243] = { "set_thread_area" },
[244] = { "get_thread_area" },
[245] = { "io_setup" },
[246] = { "io_destroy" },
[247] = { "io_getevents" },
[248] = { "io_submit" },
[249] = { "io_cancel" },
[250] = { "fadvise64" },
[252] = { "exit_group", 0x000001 },
[253] = { "lookup_dcookie" },
[254] = { "epoll_create" },
[255] = { "epoll_ctl" },
[256] = { "epoll_wait" },
[257] = { "remap_file_pages" },
[258] = { "set_tid_address" },
[259] = { "timer_create" },
[260] = { "timer_settime" },
[261] = { "timer_gettime" },
[262] = { "timer_getoverrun" },
[263] = { "timer_delete" },
[264] = { "clock_settime" },
[265] = { "clock_gettime" },
[266] = { "clock_getres" },
[267] = { "clock_nanosleep" },
[268] = { "statfs64" },
[269] = { "fstatfs64" },
[270] = { "tgkill" },
[271] = { "utimes" },
[272] = { "fadvise64_64" },
[273] = { "vserver" },
[274] = { "mbind" },
[275] = { "get_mempolicy" },
[276] = { "set_mempolicy" },
[277] = { "mq_open" },
[278] = { "mq_unlink" },
[279] = { "mq_timedsend" },
[280] = { "mq_timedreceive" },
[281] = { "mq_notify" },
[282] = { "mq_getsetattr" },
[283] = { "sys_kexec_load" },
};
asmlinkage void do_syscall_trace(int leaving)
{
#if 0
unsigned long *argp;
const char *name;
unsigned argmask;
char buffer[16];
if (!kstrace)
return;
if (!current->mm)
return;
if (__frame->gr7 == __NR_close)
return;
#if 0
if (__frame->gr7 != __NR_mmap2 &&
__frame->gr7 != __NR_vfork &&
__frame->gr7 != __NR_execve &&
__frame->gr7 != __NR_exit)
return;
#endif
argmask = 0;
name = NULL;
if (__frame->gr7 < NR_syscalls) {
name = __syscall_name_table[__frame->gr7].name;
argmask = __syscall_name_table[__frame->gr7].argmask;
}
if (!name) {
sprintf(buffer, "sys_%lx", __frame->gr7);
name = buffer;
}
if (!leaving) {
if (!argmask) {
printk(KERN_CRIT "[%d] %s(%lx,%lx,%lx,%lx,%lx,%lx)\n",
current->pid,
name,
__frame->gr8,
__frame->gr9,
__frame->gr10,
__frame->gr11,
__frame->gr12,
__frame->gr13);
}
else if (argmask == 0xffffff) {
printk(KERN_CRIT "[%d] %s()\n",
current->pid,
name);
}
else {
printk(KERN_CRIT "[%d] %s(",
current->pid,
name);
argp = &__frame->gr8;
do {
switch (argmask & 0xf) {
case 1:
printk("%ld", (long) *argp);
break;
case 2:
printk("%lo", *argp);
break;
case 3:
printk("%lx", *argp);
break;
case 4:
printk("%p", (void *) *argp);
break;
case 5:
printk("\"%s\"", (char *) *argp);
break;
}
argp++;
argmask >>= 4;
if (argmask)
printk(",");
} while (argmask);
printk(")\n");
}
}
else {
if ((int)__frame->gr8 > -4096 && (int)__frame->gr8 < 4096)
printk(KERN_CRIT "[%d] %s() = %ld\n", current->pid, name, __frame->gr8);
else
printk(KERN_CRIT "[%d] %s() = %lx\n", current->pid, name, __frame->gr8);
}
return;
#endif
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
if (!(current->ptrace & PT_PTRACED))
return;
/* we need to indicate entry or exit to strace */
if (leaving)
__frame->__status |= REG__STATUS_SYSC_EXIT;
else
__frame->__status |= REG__STATUS_SYSC_ENTRY;
ptrace_notify(SIGTRAP);
/*
* this isn't the same as continuing with a signal, but it will do
* for normal use. strace only continues with a signal if the
* stopping signal is not SIGTRAP. -brl
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
}
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