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Merge tag 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 

Pull UML updates from Richard Weinberger:
 - hostfs saw a face lifting
 - old/broken stuff was removed (SMP, HIGHMEM, SKAS3/4)
 - random cleanups and bug fixes

* tag 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: (26 commits)
  um: Print minimum physical memory requirement
  um: Move uml_postsetup in the init_thread stack
  um: add a kmsg_dumper
  x86, UML: fix integer overflow in ELF_ET_DYN_BASE
  um: hostfs: Reduce number of syscalls in readdir
  um: Remove broken highmem support
  um: Remove broken SMP support
  um: Remove SKAS3/4 support
  um: Remove ppc cruft
  um: Remove ia64 cruft
  um: Remove dead code from stacktrace
  hostfs: No need to box and later unbox the file mode
  hostfs: Use page_offset()
  hostfs: Set page flags in hostfs_readpage() correctly
  hostfs: Remove superfluous initializations in hostfs_open()
  hostfs: hostfs_open: Reset open flags upon each retry
  hostfs: Remove superfluous test in hostfs_open()
  hostfs: Report append flag in ->show_options()
  hostfs: Use __getname() in follow_link
  hostfs: Remove open coded strcpy()
  ...
This commit is contained in:
Linus Torvalds 2015-04-15 13:49:27 -07:00
parent d613896926 fe205bdd13
commit e44740c1a9
59 changed files with 319 additions and 2063 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
arch/um/Kconfig.um
View File

@ -95,48 +95,6 @@ config MAGIC_SYSRQ
The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
unless you really know what this hack does.
config SMP
bool "Symmetric multi-processing support"
default n
depends on BROKEN
help
This option enables UML SMP support.
It is NOT related to having a real SMP box. Not directly, at least.
UML implements virtual SMP by allowing as many processes to run
simultaneously on the host as there are virtual processors configured.
Obviously, if the host is a uniprocessor, those processes will
timeshare, but, inside UML, will appear to be running simultaneously.
If the host is a multiprocessor, then UML processes may run
simultaneously, depending on the host scheduler.
This, however, is supported only in TT mode. So, if you use the SKAS
patch on your host, switching to TT mode and enabling SMP usually
gives you worse performances.
Also, since the support for SMP has been under-developed, there could
be some bugs being exposed by enabling SMP.
If you don't know what to do, say N.
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
depends on SMP
default "32"
config HIGHMEM
bool "Highmem support"
depends on !64BIT && BROKEN
default n
help
This was used to allow UML to run with big amounts of memory.
Currently it is unstable, so if unsure say N.
To use big amounts of memory, it is recommended enable static
linking (i.e. CONFIG_STATIC_LINK) - this should allow the
guest to use up to 2.75G of memory.
config KERNEL_STACK_ORDER
int "Kernel stack size order"
default 1 if 64BIT

1
arch/um/Makefile-ia64
View File

@ -1 +0,0 @@
START_ADDR = 0x1000000000000000

9
arch/um/Makefile-ppc
View File

@ -1,9 +0,0 @@
ifeq ($(CONFIG_HOST_2G_2G), y)
START_ADDR = 0x80000000
else
START_ADDR = 0xc0000000
endif
ARCH_CFLAGS = -U__powerpc__ -D__UM_PPC__
# The arch is ppc, but the elf32 name is powerpc
ELF_SUBARCH = powerpc

4
arch/um/include/asm/fixmap.h
View File

@ -33,10 +33,6 @@
* fix-mapped?
*/
enum fixed_addresses {
#ifdef CONFIG_HIGHMEM
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
#endif
__end_of_fixed_addresses
};

6
arch/um/include/asm/pgtable.h
View File

@ -47,11 +47,7 @@ extern unsigned long end_iomem;
#define VMALLOC_OFFSET (__va_space)
#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
#ifdef CONFIG_HIGHMEM
# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
#else
# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
#endif
#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
#define MODULES_VADDR VMALLOC_START
#define MODULES_END VMALLOC_END
#define MODULES_LEN (MODULES_VADDR - MODULES_END)

8
arch/um/include/asm/processor-generic.h
View File

@ -98,16 +98,8 @@ struct cpuinfo_um {
extern struct cpuinfo_um boot_cpu_data;
#define my_cpu_data cpu_data[smp_processor_id()]
#ifdef CONFIG_SMP
extern struct cpuinfo_um cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data
#endif
#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
extern unsigned long get_wchan(struct task_struct *p);

26
arch/um/include/asm/smp.h
View File

@ -1,32 +1,6 @@
#ifndef __UM_SMP_H
#define __UM_SMP_H
#ifdef CONFIG_SMP
#include <linux/bitops.h>
#include <asm/current.h>
#include <linux/cpumask.h>
#define raw_smp_processor_id() (current_thread->cpu)
#define cpu_logical_map(n) (n)
#define cpu_number_map(n) (n)
extern int hard_smp_processor_id(void);
#define NO_PROC_ID -1
extern int ncpus;
static inline void smp_cpus_done(unsigned int maxcpus)
{
}
extern struct task_struct *idle_threads[NR_CPUS];
#else
#define hard_smp_processor_id() 0
#endif
#endif

1
arch/um/include/shared/as-layout.h
View File

@ -56,6 +56,7 @@ extern unsigned long brk_start;
extern unsigned long host_task_size;
extern int linux_main(int argc, char **argv);
extern void uml_finishsetup(void);
struct siginfo;
extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *);

2
arch/um/include/shared/os.h
View File

@ -174,7 +174,6 @@ extern unsigned long long os_makedev(unsigned major, unsigned minor);
/* start_up.c */
extern void os_early_checks(void);
extern void can_do_skas(void);
extern void os_check_bugs(void);
extern void check_host_supports_tls(int *supports_tls, int *tls_min);
@ -187,7 +186,6 @@ extern int os_process_parent(int pid);
extern void os_stop_process(int pid);
extern void os_kill_process(int pid, int reap_child);
extern void os_kill_ptraced_process(int pid, int reap_child);
extern long os_ptrace_ldt(long pid, long addr, long data);
extern int os_getpid(void);
extern int os_getpgrp(void);

44
arch/um/include/shared/skas/proc_mm.h
View File

@ -1,44 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SKAS_PROC_MM_H
#define __SKAS_PROC_MM_H
#define MM_MMAP 54
#define MM_MUNMAP 55
#define MM_MPROTECT 56
#define MM_COPY_SEGMENTS 57
struct mm_mmap {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
struct mm_munmap {
unsigned long addr;
unsigned long len;
};
struct mm_mprotect {
unsigned long addr;
unsigned long len;
unsigned int prot;
};
struct proc_mm_op {
int op;
union {
struct mm_mmap mmap;
struct mm_munmap munmap;
struct mm_mprotect mprotect;
int copy_segments;
} u;
};
#endif

3
arch/um/include/shared/skas/skas.h
View File

@ -9,13 +9,10 @@
#include <sysdep/ptrace.h>
extern int userspace_pid[];
extern int proc_mm, ptrace_faultinfo, ptrace_ldt;
extern int skas_needs_stub;
extern int user_thread(unsigned long stack, int flags);
extern void new_thread_handler(void);
extern void handle_syscall(struct uml_pt_regs *regs);
extern int new_mm(unsigned long stack);
extern long execute_syscall_skas(void *r);
extern unsigned long current_stub_stack(void);

14
arch/um/include/shared/skas_ptrace.h
View File

@ -1,14 +0,0 @@
/*
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#ifndef __SKAS_PTRACE_H
#define __SKAS_PTRACE_H
#define PTRACE_FAULTINFO 52
#define PTRACE_SWITCH_MM 55
#include <sysdep/skas_ptrace.h>
#endif

4
arch/um/kernel/Makefile
View File

@ -12,8 +12,8 @@ clean-files :=
obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \
physmem.o process.o ptrace.o reboot.o sigio.o \
signal.o smp.o syscall.o sysrq.o time.o tlb.o trap.o \
um_arch.o umid.o maccess.o skas/
signal.o syscall.o sysrq.o time.o tlb.o trap.o \
um_arch.o umid.o maccess.o kmsg_dump.o skas/
obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
obj-$(CONFIG_GPROF) += gprof_syms.o

3
arch/um/kernel/irq.c
View File

@ -35,9 +35,6 @@ void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
struct irq_fd *irq_fd;
int n;
if (smp_sigio_handler())
return;
while (1) {
n = os_waiting_for_events(active_fds);
if (n <= 0) {

43
arch/um/kernel/kmsg_dump.c Normal file
View File

@ -0,0 +1,43 @@
#include <linux/kmsg_dump.h>
#include <linux/console.h>
#include <shared/init.h>
#include <shared/kern.h>
#include <os.h>
static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
static char line[1024];
size_t len = 0;
bool con_available = false;
/* only dump kmsg when no console is available */
if (!console_trylock())
return;
if (console_drivers != NULL)
con_available = true;
console_unlock();
if (con_available == true)
return;
printf("kmsg_dump:\n");
while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
line[len] = '\0';
printf("%s", line);
}
}
static struct kmsg_dumper kmsg_dumper = {
.dump = kmsg_dumper_stdout
};
int __init kmsg_dumper_stdout_init(void)
{
return kmsg_dump_register(&kmsg_dumper);
}
__uml_postsetup(kmsg_dumper_stdout_init);

66
arch/um/kernel/mem.c
View File

@ -38,19 +38,6 @@ int kmalloc_ok = 0;
/* Used during early boot */
static unsigned long brk_end;
#ifdef CONFIG_HIGHMEM
static void setup_highmem(unsigned long highmem_start,
unsigned long highmem_len)
{
unsigned long highmem_pfn;
int i;
highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
for (i = 0; i < highmem_len >> PAGE_SHIFT; i++)
free_highmem_page(&mem_map[highmem_pfn + i]);
}
#endif
void __init mem_init(void)
{
/* clear the zero-page */
@ -67,9 +54,6 @@ void __init mem_init(void)
/* this will put all low memory onto the freelists */
free_all_bootmem();
max_low_pfn = totalram_pages;
#ifdef CONFIG_HIGHMEM
setup_highmem(end_iomem, highmem);
#endif
max_pfn = totalram_pages;
mem_init_print_info(NULL);
kmalloc_ok = 1;
@ -127,49 +111,6 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
}
}
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\
(vaddr)), (vaddr))
static void __init kmap_init(void)
{
unsigned long kmap_vstart;
/* cache the first kmap pte */
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
kmap_prot = PAGE_KERNEL;
}
static void __init init_highmem(void)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long vaddr;
/*
* Permanent kmaps:
*/
vaddr = PKMAP_BASE;
fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
pgd = swapper_pg_dir + pgd_index(vaddr);
pud = pud_offset(pgd, vaddr);
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;
kmap_init();
}
#endif /* CONFIG_HIGHMEM */
static void __init fixaddr_user_init( void)
{
#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
@ -211,9 +152,6 @@ void __init paging_init(void)
zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
(uml_physmem >> PAGE_SHIFT);
#ifdef CONFIG_HIGHMEM
zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT;
#endif
free_area_init(zones_size);
/*
@ -224,10 +162,6 @@ void __init paging_init(void)
fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
fixaddr_user_init();
#ifdef CONFIG_HIGHMEM
init_highmem();
#endif
}
/*

41
arch/um/kernel/physmem.c
View File

@ -57,22 +57,51 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
extern int __syscall_stub_start;
/**
* setup_physmem() - Setup physical memory for UML
* @start: Start address of the physical kernel memory,
* i.e start address of the executable image.
* @reserve_end: end address of the physical kernel memory.
* @len: Length of total physical memory that should be mapped/made
* available, in bytes.
* @highmem: Number of highmem bytes that should be mapped/made available.
*
* Creates an unlinked temporary file of size (len + highmem) and memory maps
* it on the last executable image address (uml_reserved).
*
* The offset is needed as the length of the total physical memory
* (len + highmem) includes the size of the memory used be the executable image,
* but the mapped-to address is the last address of the executable image
* (uml_reserved == end address of executable image).
*
* The memory mapped memory of the temporary file is used as backing memory
* of all user space processes/kernel tasks.
*/
void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
{
unsigned long reserve = reserve_end - start;
int pfn = PFN_UP(__pa(reserve_end));
int delta = (len - reserve) >> PAGE_SHIFT;
int err, offset, bootmap_size;
unsigned long pfn = PFN_UP(__pa(reserve_end));
unsigned long delta = (len - reserve) >> PAGE_SHIFT;
unsigned long offset, bootmap_size;
long map_size;
int err;
offset = uml_reserved - uml_physmem;
map_size = len - offset;
if(map_size <= 0) {
printf("Too few physical memory! Needed=%d, given=%d\n",
offset, len);
exit(1);
}
physmem_fd = create_mem_file(len + highmem);
offset = uml_reserved - uml_physmem;
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
len - offset, 1, 1, 1);
map_size, 1, 1, 1);
if (err < 0) {
printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
"failed - errno = %d\n", len - offset,
"failed - errno = %d\n", map_size,
(void *) uml_reserved, err);
exit(1);
}

11
arch/um/kernel/process.c
View File

@ -259,17 +259,6 @@ int strlen_user_proc(char __user *str)
return strlen_user(str);
}
int smp_sigio_handler(void)
{
#ifdef CONFIG_SMP
int cpu = current_thread_info()->cpu;
IPI_handler(cpu);
if (cpu != 0)
return 1;
#endif
return 0;
}
int cpu(void)
{
return current_thread_info()->cpu;

32
arch/um/kernel/ptrace.c
View File

@ -8,9 +8,6 @@
#include <linux/sched.h>
#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <skas_ptrace.h>
void user_enable_single_step(struct task_struct *child)
{
@ -104,35 +101,6 @@ long arch_ptrace(struct task_struct *child, long request,
ret = ptrace_set_thread_area(child, addr, vp);
break;
case PTRACE_FAULTINFO: {
/*
* Take the info from thread->arch->faultinfo,
* but transfer max. sizeof(struct ptrace_faultinfo).
* On i386, ptrace_faultinfo is smaller!
*/
ret = copy_to_user(p, &child->thread.arch.faultinfo,
sizeof(struct ptrace_faultinfo)) ?
-EIO : 0;
break;
}
#ifdef PTRACE_LDT
case PTRACE_LDT: {
struct ptrace_ldt ldt;
if (copy_from_user(&ldt, p, sizeof(ldt))) {
ret = -EIO;
break;
}
/*
* This one is confusing, so just punt and return -EIO for
* now
*/
ret = -EIO;
break;
}
#endif
default:
ret = ptrace_request(child, request, addr, data);
if (ret == -EIO)

31
arch/um/kernel/reboot.c
View File

@ -15,28 +15,21 @@ void (*pm_power_off)(void);
static void kill_off_processes(void)
{
if (proc_mm)
/*
* FIXME: need to loop over userspace_pids
*/
os_kill_ptraced_process(userspace_pid[0], 1);
else {
struct task_struct *p;
int pid;
struct task_struct *p;
int pid;
read_lock(&tasklist_lock);
for_each_process(p) {
struct task_struct *t;
read_lock(&tasklist_lock);
for_each_process(p) {
struct task_struct *t;
t = find_lock_task_mm(p);
if (!t)
continue;
pid = t->mm->context.id.u.pid;
task_unlock(t);
os_kill_ptraced_process(pid, 1);
}
read_unlock(&tasklist_lock);
t = find_lock_task_mm(p);
if (!t)
continue;
pid = t->mm->context.id.u.pid;
task_unlock(t);
os_kill_ptraced_process(pid, 1);
}
read_unlock(&tasklist_lock);
}
void uml_cleanup(void)

66
arch/um/kernel/skas/mmu.c
View File

@ -54,35 +54,22 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
unsigned long stack = 0;
int ret = -ENOMEM;
if (skas_needs_stub) {
stack = get_zeroed_page(GFP_KERNEL);
if (stack == 0)
goto out;
}
stack = get_zeroed_page(GFP_KERNEL);
if (stack == 0)
goto out;
to_mm->id.stack = stack;
if (current->mm != NULL && current->mm != &init_mm)
from_mm = &current->mm->context;
if (proc_mm) {
ret = new_mm(stack);
if (ret < 0) {
printk(KERN_ERR "init_new_context_skas - "
"new_mm failed, errno = %d\n", ret);
goto out_free;
}
to_mm->id.u.mm_fd = ret;
}
else {
if (from_mm)
to_mm->id.u.pid = copy_context_skas0(stack,
from_mm->id.u.pid);
else to_mm->id.u.pid = start_userspace(stack);
if (from_mm)
to_mm->id.u.pid = copy_context_skas0(stack,
from_mm->id.u.pid);
else to_mm->id.u.pid = start_userspace(stack);
if (to_mm->id.u.pid < 0) {
ret = to_mm->id.u.pid;
goto out_free;
}
if (to_mm->id.u.pid < 0) {
ret = to_mm->id.u.pid;
goto out_free;
}
ret = init_new_ldt(to_mm, from_mm);
@ -105,9 +92,6 @@ void uml_setup_stubs(struct mm_struct *mm)
{
int err, ret;
if (!skas_needs_stub)
return;
ret = init_stub_pte(mm, STUB_CODE,
(unsigned long) &__syscall_stub_start);
if (ret)
@ -154,25 +138,19 @@ void destroy_context(struct mm_struct *mm)
{
struct mm_context *mmu = &mm->context;
if (proc_mm)
os_close_file(mmu->id.u.mm_fd);
else {
/*
* If init_new_context wasn't called, this will be
* zero, resulting in a kill(0), which will result in the
* whole UML suddenly dying. Also, cover negative and
* 1 cases, since they shouldn't happen either.
*/
if (mmu->id.u.pid < 2) {
printk(KERN_ERR "corrupt mm_context - pid = %d\n",
mmu->id.u.pid);
return;
}
os_kill_ptraced_process(mmu->id.u.pid, 1);
/*
* If init_new_context wasn't called, this will be
* zero, resulting in a kill(0), which will result in the
* whole UML suddenly dying. Also, cover negative and
* 1 cases, since they shouldn't happen either.
*/
if (mmu->id.u.pid < 2) {
printk(KERN_ERR "corrupt mm_context - pid = %d\n",
mmu->id.u.pid);
return;
}
os_kill_ptraced_process(mmu->id.u.pid, 1);
if (skas_needs_stub)
free_page(mmu->id.stack);
free_page(mmu->id.stack);
free_ldt(mmu);
}

31
arch/um/kernel/skas/process.c
View File

@ -10,25 +10,6 @@
#include <os.h>
#include <skas.h>
int new_mm(unsigned long stack)
{
int fd, err;
fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
if (fd < 0)
return fd;
if (skas_needs_stub) {
err = map_stub_pages(fd, STUB_CODE, STUB_DATA, stack);
if (err) {
os_close_file(fd);
return err;
}
}
return fd;
}
extern void start_kernel(void);
static int __init start_kernel_proc(void *unused)
@ -40,9 +21,7 @@ static int __init start_kernel_proc(void *unused)
cpu_tasks[0].pid = pid;
cpu_tasks[0].task = current;
#ifdef CONFIG_SMP
init_cpu_online(get_cpu_mask(0));
#endif
start_kernel();
return 0;
}
@ -55,14 +34,6 @@ int __init start_uml(void)
{
stack_protections((unsigned long) &cpu0_irqstack);
set_sigstack(cpu0_irqstack, THREAD_SIZE);
if (proc_mm) {
userspace_pid[0] = start_userspace(0);
if (userspace_pid[0] < 0) {
printf("start_uml - start_userspace returned %d\n",
userspace_pid[0]);
exit(1);
}
}
init_new_thread_signals();

238
arch/um/kernel/smp.c
View File

@ -1,238 +0,0 @@
/*
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <linux/percpu.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#ifdef CONFIG_SMP
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/threads.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/hardirq.h>
#include <asm/smp.h>
#include <asm/processor.h>
#include <asm/spinlock.h>
#include <kern.h>
#include <irq_user.h>
#include <os.h>
/* Per CPU bogomips and other parameters
* The only piece used here is the ipi pipe, which is set before SMP is
* started and never changed.
*/
struct cpuinfo_um cpu_data[NR_CPUS];
/* A statistic, can be a little off */
int num_reschedules_sent = 0;
/* Not changed after boot */
struct task_struct *idle_threads[NR_CPUS];
void smp_send_reschedule(int cpu)
{
os_write_file(cpu_data[cpu].ipi_pipe[1], "R", 1);
num_reschedules_sent++;
}
void smp_send_stop(void)
{
int i;
printk(KERN_INFO "Stopping all CPUs...");
for (i = 0; i < num_online_cpus(); i++) {
if (i == current_thread->cpu)
continue;
os_write_file(cpu_data[i].ipi_pipe[1], "S", 1);
}
printk(KERN_CONT "done\n");
}
static cpumask_t smp_commenced_mask = CPU_MASK_NONE;
static cpumask_t cpu_callin_map = CPU_MASK_NONE;
static int idle_proc(void *cpup)
{
int cpu = (int) cpup, err;
err = os_pipe(cpu_data[cpu].ipi_pipe, 1, 1);
if (err < 0)
panic("CPU#%d failed to create IPI pipe, err = %d", cpu, -err);
os_set_fd_async(cpu_data[cpu].ipi_pipe[0]);
wmb();
if (cpu_test_and_set(cpu, cpu_callin_map)) {
printk(KERN_ERR "huh, CPU#%d already present??\n", cpu);
BUG();
}
while (!cpu_isset(cpu, smp_commenced_mask))
cpu_relax();
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);
default_idle();
return 0;
}
static struct task_struct *idle_thread(int cpu)
{
struct task_struct *new_task;
current->thread.request.u.thread.proc = idle_proc;
current->thread.request.u.thread.arg = (void *) cpu;
new_task = fork_idle(cpu);
if (IS_ERR(new_task))
panic("copy_process failed in idle_thread, error = %ld",
PTR_ERR(new_task));
cpu_tasks[cpu] = ((struct cpu_task)
{ .pid = new_task->thread.mode.tt.extern_pid,
.task = new_task } );
idle_threads[cpu] = new_task;
panic("skas mode doesn't support SMP");
return new_task;
}
void smp_prepare_cpus(unsigned int maxcpus)
{
struct task_struct *idle;
unsigned long waittime;
int err, cpu, me = smp_processor_id();
int i;
for (i = 0; i < ncpus; ++i)
set_cpu_possible(i, true);
set_cpu_online(me, true);
cpu_set(me, cpu_callin_map);
err = os_pipe(cpu_data[me].ipi_pipe, 1, 1);
if (err < 0)
panic("CPU#0 failed to create IPI pipe, errno = %d", -err);
os_set_fd_async(cpu_data[me].ipi_pipe[0]);
for (cpu = 1; cpu < ncpus; cpu++) {
printk(KERN_INFO "Booting processor %d...\n", cpu);
idle = idle_thread(cpu);
init_idle(idle, cpu);
waittime = 200000000;
while (waittime-- && !cpu_isset(cpu, cpu_callin_map))
cpu_relax();
printk(KERN_INFO "%s\n",
cpu_isset(cpu, cpu_calling_map) ? "done" : "failed");
}
}
void smp_prepare_boot_cpu(void)
{
set_cpu_online(smp_processor_id(), true);
}
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
cpu_set(cpu, smp_commenced_mask);
while (!cpu_online(cpu))
mb();
return 0;
}
int setup_profiling_timer(unsigned int multiplier)
{
printk(KERN_INFO "setup_profiling_timer\n");
return 0;
}
void smp_call_function_slave(int cpu);
void IPI_handler(int cpu)
{
unsigned char c;
int fd;
fd = cpu_data[cpu].ipi_pipe[0];
while (os_read_file(fd, &c, 1) == 1) {
switch (c) {
case 'C':
smp_call_function_slave(cpu);
break;
case 'R':
scheduler_ipi();
break;
case 'S':
printk(KERN_INFO "CPU#%d stopping\n", cpu);
while (1)
pause();
break;
default:
printk(KERN_ERR "CPU#%d received unknown IPI [%c]!\n",
cpu, c);
break;
}
}
}
int hard_smp_processor_id(void)
{
return pid_to_processor_id(os_getpid());
}
static DEFINE_SPINLOCK(call_lock);
static atomic_t scf_started;
static atomic_t scf_finished;
static void (*func)(void *info);
static void *info;
void smp_call_function_slave(int cpu)
{
atomic_inc(&scf_started);
(*func)(info);
atomic_inc(&scf_finished);
}
int smp_call_function(void (*_func)(void *info), void *_info, int wait)
{
int cpus = num_online_cpus() - 1;
int i;
if (!cpus)
return 0;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
spin_lock_bh(&call_lock);
atomic_set(&scf_started, 0);
atomic_set(&scf_finished, 0);
func = _func;
info = _info;
for_each_online_cpu(i)
os_write_file(cpu_data[i].ipi_pipe[1], "C", 1);
while (atomic_read(&scf_started) != cpus)
barrier();
if (wait)
while (atomic_read(&scf_finished) != cpus)
barrier();
spin_unlock_bh(&call_lock);
return 0;
}
#endif

6
arch/um/kernel/sysrq.c
View File

@ -29,7 +29,7 @@ static const struct stacktrace_ops stackops = {
void show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *sp = stack, bp = 0;
unsigned long *sp = stack;
struct pt_regs *segv_regs = current->thread.segv_regs;
int i;
@ -39,10 +39,6 @@ void show_stack(struct task_struct *task, unsigned long *stack)
return;
}
#ifdef CONFIG_FRAME_POINTER
bp = get_frame_pointer(task, segv_regs);
#endif
if (!stack)
sp = get_stack_pointer(task, segv_regs);

2
arch/um/kernel/trap.c
View File

@ -220,7 +220,7 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
panic("Segfault with no mm");
}
if (SEGV_IS_FIXABLE(&fi) || SEGV_MAYBE_FIXABLE(&fi))
if (SEGV_IS_FIXABLE(&fi))
err = handle_page_fault(address, ip, is_write, is_user,
&si.si_code);
else {

67
arch/um/kernel/um_arch.c
View File

@ -11,6 +11,7 @@
#include <linux/string.h>
#include <linux/utsname.h>
#include <linux/sched.h>
#include <linux/kmsg_dump.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/sections.h>
@ -66,12 +67,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
{
int index = 0;
#ifdef CONFIG_SMP
index = (struct cpuinfo_um *) v - cpu_data;
if (!cpu_online(index))
return 0;
#endif
seq_printf(m, "processor\t: %d\n", index);
seq_printf(m, "vendor_id\t: User Mode Linux\n");
seq_printf(m, "model name\t: UML\n");
@ -168,23 +163,6 @@ __uml_setup("debug", no_skas_debug_setup,
" this flag is not needed to run gdb on UML in skas mode\n\n"
);
#ifdef CONFIG_SMP
static int __init uml_ncpus_setup(char *line, int *add)
{
if (!sscanf(line, "%d", &ncpus)) {
printf("Couldn't parse [%s]\n", line);
return -1;
}
return 0;
}
__uml_setup("ncpus=", uml_ncpus_setup,
"ncpus=<# of desired CPUs>\n"
" This tells an SMP kernel how many virtual processors to start.\n\n"
);
#endif
static int __init Usage(char *line, int *add)
{
const char **p;
@ -234,6 +212,7 @@ static void __init uml_postsetup(void)
static int panic_exit(struct notifier_block *self, unsigned long unused1,
void *unused2)
{
kmsg_dump(KMSG_DUMP_PANIC);
bust_spinlocks(1);
bust_spinlocks(0);
uml_exitcode = 1;
@ -247,6 +226,16 @@ static struct notifier_block panic_exit_notifier = {
.priority = 0
};
void uml_finishsetup(void)
{
atomic_notifier_chain_register(&panic_notifier_list,
&panic_exit_notifier);
uml_postsetup();
new_thread_handler();
}
/* Set during early boot */
unsigned long task_size;
EXPORT_SYMBOL(task_size);
@ -268,7 +257,6 @@ int __init linux_main(int argc, char **argv)
unsigned long stack;
unsigned int i;
int add;
char * mode;
for (i = 1; i < argc; i++) {
if ((i == 1) && (argv[i][0] == ' '))
@ -291,15 +279,6 @@ int __init linux_main(int argc, char **argv)
/* OS sanity checks that need to happen before the kernel runs */
os_early_checks();
can_do_skas();
if (proc_mm && ptrace_faultinfo)
mode = "SKAS3";
else
mode = "SKAS0";
printf("UML running in %s mode\n", mode);
brk_start = (unsigned long) sbrk(0);
/*
@ -334,11 +313,6 @@ int __init linux_main(int argc, char **argv)
if (physmem_size + iomem_size > max_physmem) {
highmem = physmem_size + iomem_size - max_physmem;
physmem_size -= highmem;
#ifndef CONFIG_HIGHMEM
highmem = 0;
printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
"to %Lu bytes\n", physmem_size);
#endif
}
high_physmem = uml_physmem + physmem_size;
@ -362,11 +336,6 @@ int __init linux_main(int argc, char **argv)
printf("Kernel virtual memory size shrunk to %lu bytes\n",
virtmem_size);
atomic_notifier_chain_register(&panic_notifier_list,
&panic_exit_notifier);
uml_postsetup();
stack_protections((unsigned long) &init_thread_info);
os_flush_stdout();
@ -390,15 +359,3 @@ void __init check_bugs(void)
void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
{
}
#ifdef CONFIG_SMP
void alternatives_smp_module_add(struct module *mod, char *name,
void *locks, void *locks_end,
void *text, void *text_end)
{
}
void alternatives_smp_module_del(struct module *mod)
{
}
#endif

16
arch/um/os-Linux/process.c
View File

@ -16,7 +16,6 @@
#include <init.h>
#include <longjmp.h>
#include <os.h>
#include <skas_ptrace.h>
#define ARBITRARY_ADDR -1
#define FAILURE_PID -1
@ -102,21 +101,6 @@ void os_kill_process(int pid, int reap_child)
CATCH_EINTR(waitpid(pid, NULL, __WALL));
}
/* This is here uniquely to have access to the userspace errno, i.e. the one
* used by ptrace in case of error.
*/
long os_ptrace_ldt(long pid, long addr, long data)
{
int ret;
ret = ptrace(PTRACE_LDT, pid, addr, data);
if (ret < 0)
return -errno;
return ret;
}
/* Kill off a ptraced child by all means available. kill it normally first,
* then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
* which it can't exit directly.

100
arch/um/os-Linux/skas/mem.c
View File

@ -12,7 +12,6 @@
#include <as-layout.h>
#include <mm_id.h>
#include <os.h>
#include <proc_mm.h>
#include <ptrace_user.h>
#include <registers.h>
#include <skas.h>
@ -46,8 +45,6 @@ static int __init init_syscall_regs(void)
__initcall(init_syscall_regs);
extern int proc_mm;
static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
{
int n, i;
@ -56,10 +53,6 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
unsigned long * syscall;
int err, pid = mm_idp->u.pid;
if (proc_mm)
/* FIXME: Need to look up userspace_pid by cpu */
pid = userspace_pid[0];
n = ptrace_setregs(pid, syscall_regs);
if (n < 0) {
printk(UM_KERN_ERR "Registers - \n");
@ -178,38 +171,12 @@ int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
int phys_fd, unsigned long long offset, int done, void **data)
{
int ret;
unsigned long args[] = { virt, len, prot,
MAP_SHARED | MAP_FIXED, phys_fd,
MMAP_OFFSET(offset) };
if (proc_mm) {
struct proc_mm_op map;
int fd = mm_idp->u.mm_fd;
map = ((struct proc_mm_op) { .op = MM_MMAP,
.u =
{ .mmap =
{ .addr = virt,
.len = len,
.prot = prot,
.flags = MAP_SHARED |
MAP_FIXED,
.fd = phys_fd,
.offset= offset
} } } );
CATCH_EINTR(ret = write(fd, &map, sizeof(map)));
if (ret != sizeof(map)) {
ret = -errno;
printk(UM_KERN_ERR "map : /proc/mm map failed, "
"err = %d\n", -ret);
}
else ret = 0;
}
else {
unsigned long args[] = { virt, len, prot,
MAP_SHARED | MAP_FIXED, phys_fd,
MMAP_OFFSET(offset) };
ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
data, done);
}
ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
data, done);
return ret;
}
@ -218,32 +185,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
int done, void **data)
{
int ret;
unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
0 };
if (proc_mm) {
struct proc_mm_op unmap;
int fd = mm_idp->u.mm_fd;
unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
.u =
{ .munmap =
{ .addr =
(unsigned long) addr,
.len = len } } } );
CATCH_EINTR(ret = write(fd, &unmap, sizeof(unmap)));
if (ret != sizeof(unmap)) {
ret = -errno;
printk(UM_KERN_ERR "unmap - proc_mm write returned "
"%d\n", ret);
}
else ret = 0;
}
else {
unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
0 };
ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
data, done);
}
ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
data, done);
return ret;
}
@ -251,33 +197,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
unsigned int prot, int done, void **data)
{
struct proc_mm_op protect;
int ret;
unsigned long args[] = { addr, len, prot, 0, 0, 0 };
if (proc_mm) {
int fd = mm_idp->u.mm_fd;
protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
.u =
{ .mprotect =
{ .addr =
(unsigned long) addr,
.len = len,
.prot = prot } } } );
CATCH_EINTR(ret = write(fd, &protect, sizeof(protect)));
if (ret != sizeof(protect)) {
ret = -errno;
printk(UM_KERN_ERR "protect failed, err = %d", -ret);
}
else ret = 0;
}
else {
unsigned long args[] = { addr, len, prot, 0, 0, 0 };
ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
data, done);
}
ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
data, done);
return ret;
}

202
arch/um/os-Linux/skas/process.c
View File

@ -16,11 +16,9 @@
#include <kern_util.h>
#include <mem.h>
#include <os.h>
#include <proc_mm.h>
#include <ptrace_user.h>
#include <registers.h>
#include <skas.h>
#include <skas_ptrace.h>
#include <sysdep/stub.h>
int is_skas_winch(int pid, int fd, void *data)
@ -91,50 +89,33 @@ extern unsigned long current_stub_stack(void);
static void get_skas_faultinfo(int pid, struct faultinfo *fi)
{
int err;
unsigned long fpregs[FP_SIZE];
if (ptrace_faultinfo) {
err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
if (err) {
printk(UM_KERN_ERR "get_skas_faultinfo - "
"PTRACE_FAULTINFO failed, errno = %d\n", errno);
fatal_sigsegv();
}
/* Special handling for i386, which has different structs */
if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
sizeof(struct faultinfo) -
sizeof(struct ptrace_faultinfo));
err = get_fp_registers(pid, fpregs);
if (err < 0) {
printk(UM_KERN_ERR "save_fp_registers returned %d\n",
err);
fatal_sigsegv();
}
else {
unsigned long fpregs[FP_SIZE];
err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
if (err) {
printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
"errno = %d\n", pid, errno);
fatal_sigsegv();
}
wait_stub_done(pid);
err = get_fp_registers(pid, fpregs);
if (err < 0) {
printk(UM_KERN_ERR "save_fp_registers returned %d\n",
err);
fatal_sigsegv();
}
err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
if (err) {
printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
"errno = %d\n", pid, errno);
fatal_sigsegv();
}
wait_stub_done(pid);
/*
* faultinfo is prepared by the stub-segv-handler at start of
* the stub stack page. We just have to copy it.
*/
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
/*
* faultinfo is prepared by the stub-segv-handler at start of
* the stub stack page. We just have to copy it.
*/
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
err = put_fp_registers(pid, fpregs);
if (err < 0) {
printk(UM_KERN_ERR "put_fp_registers returned %d\n",
err);
fatal_sigsegv();
}
err = put_fp_registers(pid, fpregs);
if (err < 0) {
printk(UM_KERN_ERR "put_fp_registers returned %d\n",
err);
fatal_sigsegv();
}
}
@ -198,7 +179,8 @@ extern int __syscall_stub_start;
static int userspace_tramp(void *stack)
{
void *addr;
int err;
int err, fd;
unsigned long long offset;
ptrace(PTRACE_TRACEME, 0, 0, 0);
@ -211,36 +193,32 @@ static int userspace_tramp(void *stack)
exit(1);
}
if (!proc_mm) {
/*
* This has a pte, but it can't be mapped in with the usual
* tlb_flush mechanism because this is part of that mechanism
*/
int fd;
unsigned long long offset;
fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
/*
* This has a pte, but it can't be mapped in with the usual
* tlb_flush mechanism because this is part of that mechanism
*/
fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
if (addr == MAP_FAILED) {
printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
"errno = %d\n", STUB_CODE, errno);
exit(1);
}
if (stack != NULL) {
fd = phys_mapping(to_phys(stack), &offset);
addr = mmap((void *) STUB_DATA,
UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fd, offset);
if (addr == MAP_FAILED) {
printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
"errno = %d\n", STUB_CODE, errno);
printk(UM_KERN_ERR "mapping segfault stack "
"at 0x%lx failed, errno = %d\n",
STUB_DATA, errno);
exit(1);
}
if (stack != NULL) {
fd = phys_mapping(to_phys(stack), &offset);
addr = mmap((void *) STUB_DATA,
UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fd, offset);
if (addr == MAP_FAILED) {
printk(UM_KERN_ERR "mapping segfault stack "
"at 0x%lx failed, errno = %d\n",
STUB_DATA, errno);
exit(1);
}
}
}
if (!ptrace_faultinfo && (stack != NULL)) {
if (stack != NULL) {
struct sigaction sa;
unsigned long v = STUB_CODE +
@ -286,11 +264,7 @@ int start_userspace(unsigned long stub_stack)
sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
flags = CLONE_FILES;
if (proc_mm)
flags |= CLONE_VM;
else
flags |= SIGCHLD;
flags = CLONE_FILES | SIGCHLD;
pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
if (pid < 0) {
@ -413,8 +387,7 @@ void userspace(struct uml_pt_regs *regs)
switch (sig) {
case SIGSEGV:
if (PTRACE_FULL_FAULTINFO ||
!ptrace_faultinfo) {
if (PTRACE_FULL_FAULTINFO) {
get_skas_faultinfo(pid,
&regs->faultinfo);
(*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
@ -571,67 +544,6 @@ int copy_context_skas0(unsigned long new_stack, int pid)
return err;
}
/*
* This is used only, if stub pages are needed, while proc_mm is
* available. Opening /proc/mm creates a new mm_context, which lacks
* the stub-pages. Thus, we map them using /proc/mm-fd
*/
int map_stub_pages(int fd, unsigned long code, unsigned long data,
unsigned long stack)
{
struct proc_mm_op mmop;
int n;
unsigned long long code_offset;
int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start),
&code_offset);
mmop = ((struct proc_mm_op) { .op = MM_MMAP,
.u =
{ .mmap =
{ .addr = code,
.len = UM_KERN_PAGE_SIZE,
.prot = PROT_EXEC,
.flags = MAP_FIXED | MAP_PRIVATE,
.fd = code_fd,
.offset = code_offset
} } });
CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
if (n != sizeof(mmop)) {
n = errno;
printk(UM_KERN_ERR "mmap args - addr = 0x%lx, fd = %d, "
"offset = %llx\n", code, code_fd,
(unsigned long long) code_offset);
printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for code "
"failed, err = %d\n", n);
return -n;
}
if (stack) {
unsigned long long map_offset;
int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
mmop = ((struct proc_mm_op)
{ .op = MM_MMAP,
.u =
{ .mmap =
{ .addr = data,
.len = UM_KERN_PAGE_SIZE,
.prot = PROT_READ | PROT_WRITE,
.flags = MAP_FIXED | MAP_SHARED,
.fd = map_fd,
.offset = map_offset
} } });
CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
if (n != sizeof(mmop)) {
n = errno;
printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for "
"data failed, err = %d\n", n);
return -n;
}
}
return 0;
}
void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
{
(*buf)[0].JB_IP = (unsigned long) handler;
@ -674,7 +586,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
n = setjmp(initial_jmpbuf);
switch (n) {
case INIT_JMP_NEW_THREAD:
(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
(*switch_buf)[0].JB_IP = (unsigned long) uml_finishsetup;
(*switch_buf)[0].JB_SP = (unsigned long) stack +
UM_THREAD_SIZE - sizeof(void *);
break;
@ -728,17 +640,5 @@ void reboot_skas(void)
void __switch_mm(struct mm_id *mm_idp)
{
int err;
/* FIXME: need cpu pid in __switch_mm */
if (proc_mm) {
err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
mm_idp->u.mm_fd);
if (err) {
printk(UM_KERN_ERR "__switch_mm - PTRACE_SWITCH_MM "
"failed, errno = %d\n", errno);
fatal_sigsegv();
}
}
else userspace_pid[0] = mm_idp->u.pid;
userspace_pid[0] = mm_idp->u.pid;
}

154
arch/um/os-Linux/start_up.c
View File

@ -24,7 +24,6 @@
#include <ptrace_user.h>
#include <registers.h>
#include <skas.h>
#include <skas_ptrace.h>
static void ptrace_child(void)
{
@ -142,44 +141,6 @@ static int stop_ptraced_child(int pid, int exitcode, int mustexit)
return ret;
}
/* Changed only during early boot */
int ptrace_faultinfo;
static int disable_ptrace_faultinfo;
int ptrace_ldt;
static int disable_ptrace_ldt;
int proc_mm;
static int disable_proc_mm;
int have_switch_mm;
static int disable_switch_mm;
int skas_needs_stub;
static int __init skas0_cmd_param(char *str, int* add)
{
disable_ptrace_faultinfo = 1;
disable_ptrace_ldt = 1;
disable_proc_mm = 1;
disable_switch_mm = 1;
return 0;
}
/* The two __uml_setup would conflict, without this stupid alias. */
static int __init mode_skas0_cmd_param(char *str, int* add)
__attribute__((alias("skas0_cmd_param")));
__uml_setup("skas0", skas0_cmd_param,
"skas0\n"
" Disables SKAS3 and SKAS4 usage, so that SKAS0 is used\n\n");
__uml_setup("mode=skas0", mode_skas0_cmd_param,
"mode=skas0\n"
" Disables SKAS3 and SKAS4 usage, so that SKAS0 is used.\n\n");
/* Changed only during early boot */
static int force_sysemu_disabled = 0;
@ -376,121 +337,6 @@ void __init os_early_checks(void)
stop_ptraced_child(pid, 1, 1);
}
static int __init noprocmm_cmd_param(char *str, int* add)
{
disable_proc_mm = 1;
return 0;
}
__uml_setup("noprocmm", noprocmm_cmd_param,
"noprocmm\n"
" Turns off usage of /proc/mm, even if host supports it.\n"
" To support /proc/mm, the host needs to be patched using\n"
" the current skas3 patch.\n\n");
static int __init noptracefaultinfo_cmd_param(char *str, int* add)
{
disable_ptrace_faultinfo = 1;
return 0;
}
__uml_setup("noptracefaultinfo", noptracefaultinfo_cmd_param,
"noptracefaultinfo\n"
" Turns off usage of PTRACE_FAULTINFO, even if host supports\n"
" it. To support PTRACE_FAULTINFO, the host needs to be patched\n"
" using the current skas3 patch.\n\n");
static int __init noptraceldt_cmd_param(char *str, int* add)
{
disable_ptrace_ldt = 1;
return 0;
}
__uml_setup("noptraceldt", noptraceldt_cmd_param,
"noptraceldt\n"
" Turns off usage of PTRACE_LDT, even if host supports it.\n"
" To support PTRACE_LDT, the host needs to be patched using\n"
" the current skas3 patch.\n\n");
static inline void check_skas3_ptrace_faultinfo(void)
{
struct ptrace_faultinfo fi;
int pid, n;
non_fatal(" - PTRACE_FAULTINFO...");
pid = start_ptraced_child();
n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
if (n < 0) {
if (errno == EIO)
non_fatal("not found\n");
else
perror("not found");
} else if (disable_ptrace_faultinfo)
non_fatal("found but disabled on command line\n");
else {
ptrace_faultinfo = 1;
non_fatal("found\n");
}
stop_ptraced_child(pid, 1, 1);
}
static inline void check_skas3_ptrace_ldt(void)
{
#ifdef PTRACE_LDT
int pid, n;
unsigned char ldtbuf[40];
struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
.func = 2, /* read default ldt */
.ptr = ldtbuf,
.bytecount = sizeof(ldtbuf)};
non_fatal(" - PTRACE_LDT...");
pid = start_ptraced_child();
n = ptrace(PTRACE_LDT, pid, 0, (unsigned long) &ldt_op);
if (n < 0) {
if (errno == EIO)
non_fatal("not found\n");
else
perror("not found");
} else if (disable_ptrace_ldt)
non_fatal("found, but use is disabled\n");
else {
ptrace_ldt = 1;
non_fatal("found\n");
}
stop_ptraced_child(pid, 1, 1);
#endif
}
static inline void check_skas3_proc_mm(void)
{
non_fatal(" - /proc/mm...");
if (access("/proc/mm", W_OK) < 0)
perror("not found");
else if (disable_proc_mm)
non_fatal("found but disabled on command line\n");
else {
proc_mm = 1;
non_fatal("found\n");
}
}
void can_do_skas(void)
{
non_fatal("Checking for the skas3 patch in the host:\n");
check_skas3_proc_mm();
check_skas3_ptrace_faultinfo();
check_skas3_ptrace_ldt();
if (!proc_mm || !ptrace_faultinfo || !ptrace_ldt)
skas_needs_stub = 1;
}
int __init parse_iomem(char *str, int *add)
{
struct iomem_region *new;

11
arch/um/sys-ia64/Makefile
View File

@ -1,11 +0,0 @@
OBJ = built-in.o
OBJS =
all: $(OBJ)
$(OBJ): $(OBJS)
rm -f $@
$(LD) $(LINKFLAGS) --start-group $^ --end-group -o $@
clean-files := $(OBJS) link.ld

16
arch/um/sys-ia64/sysdep/ptrace.h
View File

@ -1,16 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_IA64_PTRACE_H
#define __SYSDEP_IA64_PTRACE_H
struct sys_pt_regs {
int foo;
};
#define EMPTY_REGS { 0 }
#endif

10
arch/um/sys-ia64/sysdep/sigcontext.h
View File

@ -1,10 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_IA64_SIGCONTEXT_H
#define __SYSDEP_IA64_SIGCONTEXT_H
#endif

22
arch/um/sys-ia64/sysdep/skas_ptrace.h
View File

@ -1,22 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_IA64_SKAS_PTRACE_H
#define __SYSDEP_IA64_SKAS_PTRACE_H
struct ptrace_faultinfo {
int is_write;
unsigned long addr;
};
struct ptrace_ldt {
int func;
void *ptr;
unsigned long bytecount;
};
#define PTRACE_LDT 54
#endif

10
arch/um/sys-ia64/sysdep/syscalls.h
View File

@ -1,10 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_IA64_SYSCALLS_H
#define __SYSDEP_IA64_SYSCALLS_H
#endif

65
arch/um/sys-ppc/Makefile
View File

@ -1,65 +0,0 @@
OBJ = built-in.o
.S.o:
$(CC) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
OBJS = ptrace.o sigcontext.o checksum.o miscthings.o misc.o \
ptrace_user.o sysrq.o
asflags-y := -DCONFIG_PPC32 -I. -I$(srctree)/arch/ppc/kernel
all: $(OBJ)
$(OBJ): $(OBJS)
rm -f $@
$(LD) $(LINKFLAGS) --start-group $^ --end-group -o $@
ptrace_user.o: ptrace_user.c
$(CC) -D__KERNEL__ $(USER_CFLAGS) $(ccflags-y) -c -o $@ $<
sigcontext.o: sigcontext.c
$(CC) $(USER_CFLAGS) $(ccflags-y) -c -o $@ $<
checksum.S:
rm -f $@
ln -s $(srctree)/arch/ppc/lib/$@ $@
mk_defs.c:
rm -f $@
ln -s $(srctree)/arch/ppc/kernel/$@ $@
ppc_defs.head:
rm -f $@
ln -s $(srctree)/arch/ppc/kernel/$@ $@
ppc_defs.h: mk_defs.c ppc_defs.head \
$(srctree)/include/asm-ppc/mmu.h \
$(srctree)/include/asm-ppc/processor.h \
$(srctree)/include/asm-ppc/pgtable.h \
$(srctree)/include/asm-ppc/ptrace.h
# $(CC) $(CFLAGS) -S mk_defs.c
cp ppc_defs.head ppc_defs.h
# for bk, this way we can write to the file even if it's not checked out
echo '#define THREAD 608' >> ppc_defs.h
echo '#define PT_REGS 8' >> ppc_defs.h
echo '#define CLONE_VM 256' >> ppc_defs.h
# chmod u+w ppc_defs.h
# grep '^#define' mk_defs.s >> ppc_defs.h
# rm mk_defs.s
# the asm link is horrible, and breaks the other targets. This is also
# not going to work with parallel makes.
checksum.o: checksum.S
rm -f asm
ln -s $(srctree)/include/asm-ppc asm
$(CC) $(asflags-y) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
rm -f asm
misc.o: misc.S ppc_defs.h
rm -f asm
ln -s $(srctree)/include/asm-ppc asm
$(CC) $(asflags-y) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
rm -f asm
clean-files := $(OBJS) ppc_defs.h checksum.S mk_defs.c

8
arch/um/sys-ppc/asm/archparam.h
View File

@ -1,8 +0,0 @@
#ifndef __UM_ARCHPARAM_PPC_H
#define __UM_ARCHPARAM_PPC_H
/********* Bits for asm-um/string.h **********/
#define __HAVE_ARCH_STRRCHR
#endif

51
arch/um/sys-ppc/asm/elf.h
View File

@ -1,51 +0,0 @@
#ifndef __UM_ELF_PPC_H
#define __UM_ELF_PPC_H
extern long elf_aux_hwcap;
#define ELF_HWCAP (elf_aux_hwcap)
#define SET_PERSONALITY(ex) do ; while(0)
#define ELF_EXEC_PAGESIZE 4096
#define elf_check_arch(x) (1)
#ifdef CONFIG_64BIT
#define ELF_CLASS ELFCLASS64
#else
#define ELF_CLASS ELFCLASS32
#endif
#define R_386_NONE 0
#define R_386_32 1
#define R_386_PC32 2
#define R_386_GOT32 3
#define R_386_PLT32 4
#define R_386_COPY 5
#define R_386_GLOB_DAT 6
#define R_386_JMP_SLOT 7
#define R_386_RELATIVE 8
#define R_386_GOTOFF 9
#define R_386_GOTPC 10
#define R_386_NUM 11
#define ELF_PLATFORM (0)
#define ELF_ET_DYN_BASE (0x08000000)
/* the following stolen from asm-ppc/elf.h */
#define ELF_NGREG 48 /* includes nip, msr, lr, etc. */
#define ELF_NFPREG 33 /* includes fpscr */
/* General registers */
typedef unsigned long elf_greg_t;
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
/* Floating point registers */
typedef double elf_fpreg_t;
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
#define ELF_DATA ELFDATA2MSB
#define ELF_ARCH EM_PPC
#endif

15
arch/um/sys-ppc/asm/processor.h
View File

@ -1,15 +0,0 @@
#ifndef __UM_PROCESSOR_PPC_H
#define __UM_PROCESSOR_PPC_H
#if defined(__ASSEMBLY__)
#define CONFIG_PPC_MULTIPLATFORM
#include "arch/processor.h"
#else
#include "asm/processor-generic.h"
#endif
#endif

111
arch/um/sys-ppc/misc.S
View File

@ -1,111 +0,0 @@
/*
* This file contains miscellaneous low-level functions.
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras.
*
* A couple of functions stolen from arch/ppc/kernel/misc.S for UML
* by Chris Emerson.
*
* 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 <asm/processor.h>
#include "ppc_asm.h"
#if defined(CONFIG_4xx) || defined(CONFIG_8xx)
#define CACHE_LINE_SIZE 16
#define LG_CACHE_LINE_SIZE 4
#define MAX_COPY_PREFETCH 1
#else
#define CACHE_LINE_SIZE 32
#define LG_CACHE_LINE_SIZE 5
#define MAX_COPY_PREFETCH 4
#endif /* CONFIG_4xx || CONFIG_8xx */
.text
/*
* Clear a page using the dcbz instruction, which doesn't cause any
* memory traffic (except to write out any cache lines which get
* displaced). This only works on cacheable memory.
*/
_GLOBAL(clear_page)
li r0,4096/CACHE_LINE_SIZE
mtctr r0
#ifdef CONFIG_8xx
li r4, 0
1: stw r4, 0(r3)
stw r4, 4(r3)
stw r4, 8(r3)
stw r4, 12(r3)
#else
1: dcbz 0,r3
#endif
addi r3,r3,CACHE_LINE_SIZE
bdnz 1b
blr
/*
* Copy a whole page. We use the dcbz instruction on the destination
* to reduce memory traffic (it eliminates the unnecessary reads of
* the destination into cache). This requires that the destination
* is cacheable.
*/
#define COPY_16_BYTES \
lwz r6,4(r4); \
lwz r7,8(r4); \
lwz r8,12(r4); \
lwzu r9,16(r4); \
stw r6,4(r3); \
stw r7,8(r3); \
stw r8,12(r3); \
stwu r9,16(r3)
_GLOBAL(copy_page)
addi r3,r3,-4
addi r4,r4,-4
li r5,4
#ifndef CONFIG_8xx
#if MAX_COPY_PREFETCH > 1
li r0,MAX_COPY_PREFETCH
li r11,4
mtctr r0
11: dcbt r11,r4
addi r11,r11,CACHE_LINE_SIZE
bdnz 11b
#else /* MAX_COPY_PREFETCH == 1 */
dcbt r5,r4
li r11,CACHE_LINE_SIZE+4
#endif /* MAX_COPY_PREFETCH */
#endif /* CONFIG_8xx */
li r0,4096/CACHE_LINE_SIZE
mtctr r0
1:
#ifndef CONFIG_8xx
dcbt r11,r4
dcbz r5,r3
#endif
COPY_16_BYTES
#if CACHE_LINE_SIZE >= 32
COPY_16_BYTES
#if CACHE_LINE_SIZE >= 64
COPY_16_BYTES
COPY_16_BYTES
#if CACHE_LINE_SIZE >= 128
COPY_16_BYTES
COPY_16_BYTES
COPY_16_BYTES
COPY_16_BYTES
#endif
#endif
#endif
bdnz 1b
blr

42
arch/um/sys-ppc/miscthings.c
View File

@ -1,42 +0,0 @@
#include <linux/threads.h>
#include <linux/stddef.h> // for NULL
#include <linux/elf.h> // for AT_NULL
/* The following function nicked from arch/ppc/kernel/process.c and
* adapted slightly */
/*
* XXX ld.so expects the auxiliary table to start on
* a 16-byte boundary, so we have to find it and
* move it up. :-(
*/
void shove_aux_table(unsigned long sp)
{
int argc;
char *p;
unsigned long e;
unsigned long aux_start, offset;
argc = *(int *)sp;
sp += sizeof(int) + (argc + 1) * sizeof(char *);
/* skip over the environment pointers */
do {
p = *(char **)sp;
sp += sizeof(char *);
} while (p != NULL);
aux_start = sp;
/* skip to the end of the auxiliary table */
do {
e = *(unsigned long *)sp;
sp += 2 * sizeof(unsigned long);
} while (e != AT_NULL);
offset = ((aux_start + 15) & ~15) - aux_start;
if (offset != 0) {
do {
sp -= sizeof(unsigned long);
e = *(unsigned long *)sp;
*(unsigned long *)(sp + offset) = e;
} while (sp > aux_start);
}
}
/* END stuff taken from arch/ppc/kernel/process.c */

58
arch/um/sys-ppc/ptrace.c
View File

@ -1,58 +0,0 @@
#include <linux/sched.h>
#include "asm/ptrace.h"
int putreg(struct task_struct *child, unsigned long regno,
unsigned long value)
{
child->thread.process_regs.regs[regno >> 2] = value;
return 0;
}
int poke_user(struct task_struct *child, long addr, long data)
{
if ((addr & 3) || addr < 0)
return -EIO;
if (addr < MAX_REG_OFFSET)
return putreg(child, addr, data);
else if((addr >= offsetof(struct user, u_debugreg[0])) &&
(addr <= offsetof(struct user, u_debugreg[7]))){
addr -= offsetof(struct user, u_debugreg[0]);
addr = addr >> 2;
if((addr == 4) || (addr == 5)) return -EIO;
child->thread.arch.debugregs[addr] = data;
return 0;
}
return -EIO;
}
unsigned long getreg(struct task_struct *child, unsigned long regno)
{
unsigned long retval = ~0UL;
retval &= child->thread.process_regs.regs[regno >> 2];
return retval;
}
int peek_user(struct task_struct *child, long addr, long data)
{
/* read the word at location addr in the USER area. */
unsigned long tmp;
if ((addr & 3) || addr < 0)
return -EIO;
tmp = 0; /* Default return condition */
if(addr < MAX_REG_OFFSET){
tmp = getreg(child, addr);
}
else if((addr >= offsetof(struct user, u_debugreg[0])) &&
(addr <= offsetof(struct user, u_debugreg[7]))){
addr -= offsetof(struct user, u_debugreg[0]);
addr = addr >> 2;
tmp = child->thread.arch.debugregs[addr];
}
return put_user(tmp, (unsigned long *) data);
}

29
arch/um/sys-ppc/ptrace_user.c
View File

@ -1,29 +0,0 @@
#include <errno.h>
#include <asm/ptrace.h>
#include <sysdep/ptrace.h>
int ptrace_getregs(long pid, unsigned long *regs_out)
{
int i;
for (i=0; i < sizeof(struct sys_pt_regs)/sizeof(PPC_REG); ++i) {
errno = 0;
regs_out->regs[i] = ptrace(PTRACE_PEEKUSR, pid, i*4, 0);
if (errno) {
return -errno;
}
}
return 0;
}
int ptrace_setregs(long pid, unsigned long *regs_in)
{
int i;
for (i=0; i < sizeof(struct sys_pt_regs)/sizeof(PPC_REG); ++i) {
if (i != 34 /* FIXME: PT_ORIG_R3 */ && i <= PT_MQ) {
if (ptrace(PTRACE_POKEUSR, pid, i*4, regs_in->regs[i]) < 0) {
return -errno;
}
}
}
return 0;
}

93
arch/um/sys-ppc/shared/sysdep/ptrace.h
View File

@ -1,93 +0,0 @@
/*
* Licensed under the GPL
*/
#ifndef __SYS_PTRACE_PPC_H
#define __SYS_PTRACE_PPC_H
#include <linux/types.h>
/* the following taken from <asm-ppc/ptrace.h> */
#ifdef CONFIG_PPC64
#define PPC_REG unsigned long /*long*/
#else
#define PPC_REG unsigned long
#endif
struct sys_pt_regs_s {
PPC_REG gpr[32];
PPC_REG nip;
PPC_REG msr;
PPC_REG orig_gpr3; /* Used for restarting system calls */
PPC_REG ctr;
PPC_REG link;
PPC_REG xer;
PPC_REG ccr;
PPC_REG mq; /* 601 only (not used at present) */
/* Used on APUS to hold IPL value. */
PPC_REG trap; /* Reason for being here */
PPC_REG dar; /* Fault registers */
PPC_REG dsisr;
PPC_REG result; /* Result of a system call */
};
#define NUM_REGS (sizeof(struct sys_pt_regs_s) / sizeof(PPC_REG))
struct sys_pt_regs {
PPC_REG regs[sizeof(struct sys_pt_regs_s) / sizeof(PPC_REG)];
};
#define UM_MAX_REG (PT_FPR0)
#define UM_MAX_REG_OFFSET (UM_MAX_REG * sizeof(PPC_REG))
#define EMPTY_REGS { { [ 0 ... NUM_REGS - 1] = 0 } }
#define UM_REG(r, n) ((r)->regs[n])
#define UM_SYSCALL_RET(r) UM_REG(r, PT_R3)
#define UM_SP(r) UM_REG(r, PT_R1)
#define UM_IP(r) UM_REG(r, PT_NIP)
#define UM_ELF_ZERO(r) UM_REG(r, PT_FPSCR)
#define UM_SYSCALL_NR(r) UM_REG(r, PT_R0)
#define UM_SYSCALL_ARG1(r) UM_REG(r, PT_ORIG_R3)
#define UM_SYSCALL_ARG2(r) UM_REG(r, PT_R4)
#define UM_SYSCALL_ARG3(r) UM_REG(r, PT_R5)
#define UM_SYSCALL_ARG4(r) UM_REG(r, PT_R6)
#define UM_SYSCALL_ARG5(r) UM_REG(r, PT_R7)
#define UM_SYSCALL_ARG6(r) UM_REG(r, PT_R8)
#define UM_SYSCALL_NR_OFFSET (PT_R0 * sizeof(PPC_REG))
#define UM_SYSCALL_RET_OFFSET (PT_R3 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG1_OFFSET (PT_R3 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG2_OFFSET (PT_R4 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG3_OFFSET (PT_R5 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG4_OFFSET (PT_R6 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG5_OFFSET (PT_R7 * sizeof(PPC_REG))
#define UM_SYSCALL_ARG6_OFFSET (PT_R8 * sizeof(PPC_REG))
#define UM_SP_OFFSET (PT_R1 * sizeof(PPC_REG))
#define UM_IP_OFFSET (PT_NIP * sizeof(PPC_REG))
#define UM_ELF_ZERO_OFFSET (PT_R3 * sizeof(PPC_REG))
#define UM_SET_SYSCALL_RETURN(_regs, result) \
do { \
if (result < 0) { \
(_regs)->regs[PT_CCR] |= 0x10000000; \
UM_SYSCALL_RET((_regs)) = -result; \
} else { \
UM_SYSCALL_RET((_regs)) = result; \
} \
} while(0)
extern void shove_aux_table(unsigned long sp);
#define UM_FIX_EXEC_STACK(sp) shove_aux_table(sp);
/* These aren't actually defined. The undefs are just to make sure
* everyone's clear on the concept.
*/
#undef UML_HAVE_GETREGS
#undef UML_HAVE_GETFPREGS
#undef UML_HAVE_SETREGS
#undef UML_HAVE_SETFPREGS
#endif

52
arch/um/sys-ppc/shared/sysdep/sigcontext.h
View File

@ -1,52 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYS_SIGCONTEXT_PPC_H
#define __SYS_SIGCONTEXT_PPC_H
#define DSISR_WRITE 0x02000000
#define SC_FAULT_ADDR(sc) ({ \
struct sigcontext *_sc = (sc); \
long retval = -1; \
switch (_sc->regs->trap) { \
case 0x300: \
/* data exception */ \
retval = _sc->regs->dar; \
break; \
case 0x400: \
/* instruction exception */ \
retval = _sc->regs->nip; \
break; \
default: \
panic("SC_FAULT_ADDR: unhandled trap type\n"); \
} \
retval; \
})
#define SC_FAULT_WRITE(sc) ({ \
struct sigcontext *_sc = (sc); \
long retval = -1; \
switch (_sc->regs->trap) { \
case 0x300: \
/* data exception */ \
retval = !!(_sc->regs->dsisr & DSISR_WRITE); \
break; \
case 0x400: \
/* instruction exception: not a write */ \
retval = 0; \
break; \
default: \
panic("SC_FAULT_ADDR: unhandled trap type\n"); \
} \
retval; \
})
#define SC_IP(sc) ((sc)->regs->nip)
#define SC_SP(sc) ((sc)->regs->gpr[1])
#define SEGV_IS_FIXABLE(sc) (1)
#endif

22
arch/um/sys-ppc/shared/sysdep/skas_ptrace.h
View File

@ -1,22 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_PPC_SKAS_PTRACE_H
#define __SYSDEP_PPC_SKAS_PTRACE_H
struct ptrace_faultinfo {
int is_write;
unsigned long addr;
};
struct ptrace_ldt {
int func;
void *ptr;
unsigned long bytecount;
};
#define PTRACE_LDT 54
#endif

43
arch/um/sys-ppc/shared/sysdep/syscalls.h
View File

@ -1,43 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
typedef long syscall_handler_t(unsigned long arg1, unsigned long arg2,
unsigned long arg3, unsigned long arg4,
unsigned long arg5, unsigned long arg6);
#define EXECUTE_SYSCALL(syscall, regs) \
(*sys_call_table[syscall])(UM_SYSCALL_ARG1(&regs), \
UM_SYSCALL_ARG2(&regs), \
UM_SYSCALL_ARG3(&regs), \
UM_SYSCALL_ARG4(&regs), \
UM_SYSCALL_ARG5(&regs), \
UM_SYSCALL_ARG6(&regs))
extern syscall_handler_t sys_mincore;
extern syscall_handler_t sys_madvise;
/* old_mmap needs the correct prototype since syscall_kern.c includes
* this file.
*/
int old_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long offset);
#define ARCH_SYSCALLS \
[ __NR_modify_ldt ] = sys_ni_syscall, \
[ __NR_pciconfig_read ] = sys_ni_syscall, \
[ __NR_pciconfig_write ] = sys_ni_syscall, \
[ __NR_pciconfig_iobase ] = sys_ni_syscall, \
[ __NR_pivot_root ] = sys_ni_syscall, \
[ __NR_multiplexer ] = sys_ni_syscall, \
[ __NR_mmap ] = old_mmap, \
[ __NR_madvise ] = sys_madvise, \
[ __NR_mincore ] = sys_mincore, \
[ __NR_iopl ] = (syscall_handler_t *) sys_ni_syscall, \
[ __NR_utimes ] = (syscall_handler_t *) sys_utimes, \
[ __NR_fadvise64 ] = (syscall_handler_t *) sys_fadvise64,
#define LAST_ARCH_SYSCALL __NR_fadvise64

4
arch/um/sys-ppc/sigcontext.c
View File

@ -1,4 +0,0 @@
#include "asm/ptrace.h"
#include "asm/sigcontext.h"
#include <sysdep/ptrace.h>

33
arch/um/sys-ppc/sysrq.c
View File

@ -1,33 +0,0 @@
/*
* Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
* Licensed under the GPL
*/
#include <linux/kernel.h>
#include <linux/smp.h>
#include "asm/ptrace.h"
#include "sysrq.h"
void show_regs(struct pt_regs_subarch *regs)
{
printk("\n");
show_regs_print_info(KERN_DEFAULT);
printk("show_regs(): insert regs here.\n");
#if 0
printk("\n");
printk("EIP: %04x:[<%08lx>] CPU: %d",0xffff & regs->xcs, regs->eip,
smp_processor_id());
if (regs->xcs & 3)
printk(" ESP: %04x:%08lx",0xffff & regs->xss, regs->esp);
printk(" EFLAGS: %08lx\n", regs->eflags);
printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
regs->eax, regs->ebx, regs->ecx, regs->edx);
printk("ESI: %08lx EDI: %08lx EBP: %08lx",
regs->esi, regs->edi, regs->ebp);
printk(" DS: %04x ES: %04x\n",
0xffff & regs->xds, 0xffff & regs->xes);
#endif
show_trace(current, &regs->gpr[1]);
}

1
arch/x86/um/Makefile
View File

@ -21,7 +21,6 @@ obj-$(CONFIG_BINFMT_ELF) += elfcore.o
subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
subarch-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += ../lib/rwsem.o
subarch-$(CONFIG_HIGHMEM) += ../mm/highmem_32.o
else

11
arch/x86/um/asm/barrier.h
View File

@ -36,22 +36,11 @@
#endif /* CONFIG_X86_PPRO_FENCE */
#define dma_wmb() barrier()
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() dma_rmb()
#define smp_wmb() barrier()
#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
#else /* CONFIG_SMP */
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define set_mb(var, value) do { var = value; barrier(); } while (0)
#endif /* CONFIG_SMP */
#define read_barrier_depends() do { } while (0)
#define smp_read_barrier_depends() do { } while (0)

2
arch/x86/um/asm/elf.h
View File

@ -210,7 +210,7 @@ extern int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu);
#define ELF_EXEC_PAGESIZE 4096
#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
extern long elf_aux_hwcap;
#define ELF_HWCAP (elf_aux_hwcap)

227
arch/x86/um/ldt.c
View File

@ -8,9 +8,7 @@
#include <linux/slab.h>
#include <asm/unistd.h>
#include <os.h>
#include <proc_mm.h>
#include <skas.h>
#include <skas_ptrace.h>
#include <sysdep/tls.h>
extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
@ -19,105 +17,20 @@ static long write_ldt_entry(struct mm_id *mm_idp, int func,
struct user_desc *desc, void **addr, int done)
{
long res;
if (proc_mm) {
/*
* This is a special handling for the case, that the mm to
* modify isn't current->active_mm.
* If this is called directly by modify_ldt,
* (current->active_mm->context.skas.u == mm_idp)
* will be true. So no call to __switch_mm(mm_idp) is done.
* If this is called in case of init_new_ldt or PTRACE_LDT,
* mm_idp won't belong to current->active_mm, but child->mm.
* So we need to switch child's mm into our userspace, then
* later switch back.
*
* Note: I'm unsure: should interrupts be disabled here?
*/
if (!current->active_mm || current->active_mm == &init_mm ||
mm_idp != &current->active_mm->context.id)
__switch_mm(mm_idp);
void *stub_addr;
res = syscall_stub_data(mm_idp, (unsigned long *)desc,
(sizeof(*desc) + sizeof(long) - 1) &
~(sizeof(long) - 1),
addr, &stub_addr);
if (!res) {
unsigned long args[] = { func,
(unsigned long)stub_addr,
sizeof(*desc),
0, 0, 0 };
res = run_syscall_stub(mm_idp, __NR_modify_ldt, args,
0, addr, done);
}
if (ptrace_ldt) {
struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
.func = func,
.ptr = desc,
.bytecount = sizeof(*desc)};
u32 cpu;
int pid;
if (!proc_mm)
pid = mm_idp->u.pid;
else {
cpu = get_cpu();
pid = userspace_pid[cpu];
}
res = os_ptrace_ldt(pid, 0, (unsigned long) &ldt_op);
if (proc_mm)
put_cpu();
}
else {
void *stub_addr;
res = syscall_stub_data(mm_idp, (unsigned long *)desc,
(sizeof(*desc) + sizeof(long) - 1) &
~(sizeof(long) - 1),
addr, &stub_addr);
if (!res) {
unsigned long args[] = { func,
(unsigned long)stub_addr,
sizeof(*desc),
0, 0, 0 };
res = run_syscall_stub(mm_idp, __NR_modify_ldt, args,
0, addr, done);
}
}
if (proc_mm) {
/*
* This is the second part of special handling, that makes
* PTRACE_LDT possible to implement.
*/
if (current->active_mm && current->active_mm != &init_mm &&
mm_idp != &current->active_mm->context.id)
__switch_mm(&current->active_mm->context.id);
}
return res;
}
static long read_ldt_from_host(void __user * ptr, unsigned long bytecount)
{
int res, n;
struct ptrace_ldt ptrace_ldt = (struct ptrace_ldt) {
.func = 0,
.bytecount = bytecount,
.ptr = kmalloc(bytecount, GFP_KERNEL)};
u32 cpu;
if (ptrace_ldt.ptr == NULL)
return -ENOMEM;
/*
* This is called from sys_modify_ldt only, so userspace_pid gives
* us the right number
*/
cpu = get_cpu();
res = os_ptrace_ldt(userspace_pid[cpu], 0, (unsigned long) &ptrace_ldt);
put_cpu();
if (res < 0)
goto out;
n = copy_to_user(ptr, ptrace_ldt.ptr, res);
if (n != 0)
res = -EFAULT;
out:
kfree(ptrace_ldt.ptr);
return res;
}
@ -145,9 +58,6 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
err = bytecount;
if (ptrace_ldt)
return read_ldt_from_host(ptr, bytecount);
mutex_lock(&ldt->lock);
if (ldt->entry_count <= LDT_DIRECT_ENTRIES) {
size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES;
@ -229,17 +139,11 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
goto out;
}
if (!ptrace_ldt)
mutex_lock(&ldt->lock);
mutex_lock(&ldt->lock);
err = write_ldt_entry(mm_idp, func, &ldt_info, &addr, 1);
if (err)
goto out_unlock;
else if (ptrace_ldt) {
/* With PTRACE_LDT available, this is used as a flag only */
ldt->entry_count = 1;
goto out;
}
if (ldt_info.entry_number >= ldt->entry_count &&
ldt_info.entry_number >= LDT_DIRECT_ENTRIES) {
@ -393,91 +297,56 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
int i;
long page, err=0;
void *addr = NULL;
struct proc_mm_op copy;
if (!ptrace_ldt)
mutex_init(&new_mm->arch.ldt.lock);
mutex_init(&new_mm->arch.ldt.lock);
if (!from_mm) {
memset(&desc, 0, sizeof(desc));
/*
* We have to initialize a clean ldt.
* Now we try to retrieve info about the ldt, we
* inherited from the host. All ldt-entries found
* will be reset in the following loop
*/
if (proc_mm) {
/*
* If the new mm was created using proc_mm, host's
* default-ldt currently is assigned, which normally
* contains the call-gates for lcall7 and lcall27.
* To remove these gates, we simply write an empty
* entry as number 0 to the host.
*/
err = write_ldt_entry(&new_mm->id, 1, &desc, &addr, 1);
}
else{
/*
* Now we try to retrieve info about the ldt, we
* inherited from the host. All ldt-entries found
* will be reset in the following loop
*/
ldt_get_host_info();
for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
desc.entry_number = *num_p;
err = write_ldt_entry(&new_mm->id, 1, &desc,
&addr, *(num_p + 1) == -1);
if (err)
break;
}
ldt_get_host_info();
for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
desc.entry_number = *num_p;
err = write_ldt_entry(&new_mm->id, 1, &desc,
&addr, *(num_p + 1) == -1);
if (err)
break;
}
new_mm->arch.ldt.entry_count = 0;
goto out;
}
if (proc_mm) {
/*
* We have a valid from_mm, so we now have to copy the LDT of
* from_mm to new_mm, because using proc_mm an new mm with
* an empty/default LDT was created in new_mm()
*/
copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
.u =
{ .copy_segments =
from_mm->id.u.mm_fd } } );
i = os_write_file(new_mm->id.u.mm_fd, &copy, sizeof(copy));
if (i != sizeof(copy))
printk(KERN_ERR "new_mm : /proc/mm copy_segments "
"failed, err = %d\n", -i);
}
if (!ptrace_ldt) {
/*
* Our local LDT is used to supply the data for
* modify_ldt(READLDT), if PTRACE_LDT isn't available,
* i.e., we have to use the stub for modify_ldt, which
* can't handle the big read buffer of up to 64kB.
*/
mutex_lock(&from_mm->arch.ldt.lock);
if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
sizeof(new_mm->arch.ldt.u.entries));
else {
i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-->0) {
page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
if (!page) {
err = -ENOMEM;
break;
}
new_mm->arch.ldt.u.pages[i] =
(struct ldt_entry *) page;
memcpy(new_mm->arch.ldt.u.pages[i],
from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
/*
* Our local LDT is used to supply the data for
* modify_ldt(READLDT), if PTRACE_LDT isn't available,
* i.e., we have to use the stub for modify_ldt, which
* can't handle the big read buffer of up to 64kB.
*/
mutex_lock(&from_mm->arch.ldt.lock);
if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
sizeof(new_mm->arch.ldt.u.entries));
else {
i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-->0) {
page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
if (!page) {
err = -ENOMEM;
break;
}
new_mm->arch.ldt.u.pages[i] =
(struct ldt_entry *) page;
memcpy(new_mm->arch.ldt.u.pages[i],
from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
}
new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
mutex_unlock(&from_mm->arch.ldt.lock);
}
new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
mutex_unlock(&from_mm->arch.ldt.lock);
out:
return err;
@ -488,7 +357,7 @@ void free_ldt(struct mm_context *mm)
{
int i;
if (!ptrace_ldt && mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
if (mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
i = mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-- > 0)
free_page((long) mm->arch.ldt.u.pages[i]);

3
arch/x86/um/shared/sysdep/faultinfo_32.h
View File

@ -27,9 +27,6 @@ struct faultinfo {
/* This is Page Fault */
#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
/* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
#define SEGV_MAYBE_FIXABLE(fi) ((fi)->trap_no == 0 && ptrace_faultinfo)
#define PTRACE_FULL_FAULTINFO 0
#endif

3
arch/x86/um/shared/sysdep/faultinfo_64.h
View File

@ -27,9 +27,6 @@ struct faultinfo {
/* This is Page Fault */
#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
/* No broken SKAS API, which doesn't pass trap_no, here. */
#define SEGV_MAYBE_FIXABLE(fi) 0
#define PTRACE_FULL_FAULTINFO 1
#endif

22
arch/x86/um/shared/sysdep/skas_ptrace.h
View File

@ -1,22 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __SYSDEP_X86_SKAS_PTRACE_H
#define __SYSDEP_X86_SKAS_PTRACE_H
struct ptrace_faultinfo {
int is_write;
unsigned long addr;
};
struct ptrace_ldt {
int func;
void *ptr;
unsigned long bytecount;
};
#define PTRACE_LDT 54
#endif

6
fs/hostfs/hostfs.h
View File

@ -66,7 +66,8 @@ extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
extern int access_file(char *path, int r, int w, int x);
extern int open_file(char *path, int r, int w, int append);
extern void *open_dir(char *path, int *err_out);
extern char *read_dir(void *stream, unsigned long long *pos,
extern void seek_dir(void *stream, unsigned long long pos);
extern char *read_dir(void *stream, unsigned long long *pos_out,
unsigned long long *ino_out, int *len_out,
unsigned int *type_out);
extern void close_file(void *stream);
@ -77,8 +78,7 @@ extern int write_file(int fd, unsigned long long *offset, const char *buf,
int len);
extern int lseek_file(int fd, long long offset, int whence);
extern int fsync_file(int fd, int datasync);
extern int file_create(char *name, int ur, int uw, int ux, int gr,
int gw, int gx, int or, int ow, int ox);
extern int file_create(char *name, int mode);
extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
extern int make_symlink(const char *from, const char *to);
extern int unlink_file(const char *file);

112
fs/hostfs/hostfs_kern.c
View File

@ -24,6 +24,7 @@ struct hostfs_inode_info {
int fd;
fmode_t mode;
struct inode vfs_inode;
struct mutex open_mutex;
};
static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
@ -92,16 +93,22 @@ static char *__dentry_name(struct dentry *dentry, char *name)
__putname(name);
return NULL;
}
/*
* This function relies on the fact that dentry_path_raw() will place
* the path name at the end of the provided buffer.
*/
BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
strlcpy(name, root, PATH_MAX);
if (len > p - name) {
__putname(name);
return NULL;
}
if (p > name + len) {
char *s = name + len;
while ((*s++ = *p++) != '\0')
;
}
if (p > name + len)
strcpy(name + len, p);
return name;
}
@ -135,21 +142,19 @@ static char *follow_link(char *link)
int len, n;
char *name, *resolved, *end;
len = 64;
while (1) {
name = __getname();
if (!name) {
n = -ENOMEM;
name = kmalloc(len, GFP_KERNEL);
if (name == NULL)
goto out;
n = hostfs_do_readlink(link, name, len);
if (n < len)
break;
len *= 2;
kfree(name);
goto out_free;
}
n = hostfs_do_readlink(link, name, PATH_MAX);
if (n < 0)
goto out_free;
else if (n == PATH_MAX) {
n = -E2BIG;
goto out_free;
}
if (*name == '/')
return name;
@ -168,13 +173,12 @@ static char *follow_link(char *link)
}
sprintf(resolved, "%s%s", link, name);
kfree(name);
__putname(name);
kfree(link);
return resolved;
out_free:
kfree(name);
out:
__putname(name);
return ERR_PTR(n);
}
@ -225,6 +229,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
hi->fd = -1;
hi->mode = 0;
inode_init_once(&hi->vfs_inode);
mutex_init(&hi->open_mutex);
return &hi->vfs_inode;
}
@ -257,6 +262,9 @@ static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
if (strlen(root_path) > offset)
seq_printf(seq, ",%s", root_path + offset);
if (append)
seq_puts(seq, ",append");
return 0;
}
@ -284,6 +292,7 @@ static int hostfs_readdir(struct file *file, struct dir_context *ctx)
if (dir == NULL)
return -error;
next = ctx->pos;
seek_dir(dir, next);
while ((name = read_dir(dir, &next, &ino, &len, &type)) != NULL) {
if (!dir_emit(ctx, name, len, ino, type))
break;
@ -293,13 +302,12 @@ static int hostfs_readdir(struct file *file, struct dir_context *ctx)
return 0;
}
static int hostfs_file_open(struct inode *ino, struct file *file)
static int hostfs_open(struct inode *ino, struct file *file)
{
static DEFINE_MUTEX(open_mutex);
char *name;
fmode_t mode = 0;
fmode_t mode;
int err;
int r = 0, w = 0, fd;
int r, w, fd;
mode = file->f_mode & (FMODE_READ | FMODE_WRITE);
if ((mode & HOSTFS_I(ino)->mode) == mode)
@ -308,12 +316,12 @@ static int hostfs_file_open(struct inode *ino, struct file *file)
mode |= HOSTFS_I(ino)->mode;
retry:
r = w = 0;
if (mode & FMODE_READ)
r = 1;
if (mode & FMODE_WRITE)
w = 1;
if (w)
r = 1;
r = w = 1;
name = dentry_name(file->f_path.dentry);
if (name == NULL)
@ -324,15 +332,16 @@ retry:
if (fd < 0)
return fd;
mutex_lock(&open_mutex);
mutex_lock(&HOSTFS_I(ino)->open_mutex);
/* somebody else had handled it first? */
if ((mode & HOSTFS_I(ino)->mode) == mode) {
mutex_unlock(&open_mutex);
mutex_unlock(&HOSTFS_I(ino)->open_mutex);
close_file(&fd);
return 0;
}
if ((mode | HOSTFS_I(ino)->mode) != mode) {
mode |= HOSTFS_I(ino)->mode;
mutex_unlock(&open_mutex);
mutex_unlock(&HOSTFS_I(ino)->open_mutex);
close_file(&fd);
goto retry;
}
@ -342,12 +351,12 @@ retry:
err = replace_file(fd, HOSTFS_I(ino)->fd);
close_file(&fd);
if (err < 0) {
mutex_unlock(&open_mutex);
mutex_unlock(&HOSTFS_I(ino)->open_mutex);
return err;
}
}
HOSTFS_I(ino)->mode = mode;
mutex_unlock(&open_mutex);
mutex_unlock(&HOSTFS_I(ino)->open_mutex);
return 0;
}
@ -382,7 +391,7 @@ static const struct file_operations hostfs_file_fops = {
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
.mmap = generic_file_mmap,
.open = hostfs_file_open,
.open = hostfs_open,
.release = hostfs_file_release,
.fsync = hostfs_fsync,
};
@ -391,6 +400,8 @@ static const struct file_operations hostfs_dir_fops = {
.llseek = generic_file_llseek,
.iterate = hostfs_readdir,
.read = generic_read_dir,
.open = hostfs_open,
.fsync = hostfs_fsync,
};
static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
@ -398,7 +409,7 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
char *buffer;
unsigned long long base;
loff_t base = page_offset(page);
int count = PAGE_CACHE_SIZE;
int end_index = inode->i_size >> PAGE_CACHE_SHIFT;
int err;
@ -407,7 +418,6 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
count = inode->i_size & (PAGE_CACHE_SIZE-1);
buffer = kmap(page);
base = ((unsigned long long) page->index) << PAGE_CACHE_SHIFT;
err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
if (err != count) {
@ -432,26 +442,29 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
static int hostfs_readpage(struct file *file, struct page *page)
{
char *buffer;
long long start;
int err = 0;
loff_t start = page_offset(page);
int bytes_read, ret = 0;
start = (long long) page->index << PAGE_CACHE_SHIFT;
buffer = kmap(page);
err = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
PAGE_CACHE_SIZE);
if (err < 0)
if (bytes_read < 0) {
ClearPageUptodate(page);
SetPageError(page);
ret = bytes_read;
goto out;
}
memset(&buffer[err], 0, PAGE_CACHE_SIZE - err);
memset(buffer + bytes_read, 0, PAGE_CACHE_SIZE - bytes_read);
flush_dcache_page(page);
ClearPageError(page);
SetPageUptodate(page);
if (PageError(page)) ClearPageError(page);
err = 0;
out:
flush_dcache_page(page);
kunmap(page);
unlock_page(page);
return err;
return ret;
}
static int hostfs_write_begin(struct file *file, struct address_space *mapping,
@ -528,11 +541,13 @@ static int read_name(struct inode *ino, char *name)
init_special_inode(ino, st.mode & S_IFMT, rdev);
ino->i_op = &hostfs_iops;
break;
default:
case S_IFREG:
ino->i_op = &hostfs_iops;
ino->i_fop = &hostfs_file_fops;
ino->i_mapping->a_ops = &hostfs_aops;
break;
default:
return -EIO;
}
ino->i_ino = st.ino;
@ -566,10 +581,7 @@ static int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
if (name == NULL)
goto out_put;
fd = file_create(name,
mode & S_IRUSR, mode & S_IWUSR, mode & S_IXUSR,
mode & S_IRGRP, mode & S_IWGRP, mode & S_IXGRP,
mode & S_IROTH, mode & S_IWOTH, mode & S_IXOTH);
fd = file_create(name, mode & S_IFMT);
if (fd < 0)
error = fd;
else

27
fs/hostfs/hostfs_user.c
View File

@ -97,21 +97,27 @@ void *open_dir(char *path, int *err_out)
return dir;
}
char *read_dir(void *stream, unsigned long long *pos,
void seek_dir(void *stream, unsigned long long pos)
{
DIR *dir = stream;
seekdir(dir, pos);
}
char *read_dir(void *stream, unsigned long long *pos_out,
unsigned long long *ino_out, int *len_out,
unsigned int *type_out)
{
DIR *dir = stream;
struct dirent *ent;
seekdir(dir, *pos);
ent = readdir(dir);
if (ent == NULL)
return NULL;
*len_out = strlen(ent->d_name);
*ino_out = ent->d_ino;
*type_out = ent->d_type;
*pos = telldir(dir);
*pos_out = ent->d_off;
return ent->d_name;
}
@ -175,21 +181,10 @@ void close_dir(void *stream)
closedir(stream);
}
int file_create(char *name, int ur, int uw, int ux, int gr,
int gw, int gx, int or, int ow, int ox)
int file_create(char *name, int mode)
{
int mode, fd;
int fd;
mode = 0;
mode |= ur ? S_IRUSR : 0;
mode |= uw ? S_IWUSR : 0;
mode |= ux ? S_IXUSR : 0;
mode |= gr ? S_IRGRP : 0;
mode |= gw ? S_IWGRP : 0;
mode |= gx ? S_IXGRP : 0;
mode |= or ? S_IROTH : 0;
mode |= ow ? S_IWOTH : 0;
mode |= ox ? S_IXOTH : 0;
fd = open64(name, O_CREAT | O_RDWR, mode);
if (fd < 0)
return -errno;