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OpenCloudOS-Kernel
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Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Fix kprobes build with non-gawk awk
  x86: Split swiotlb initialization into two stages
  x86: Regex support and known-movable symbols for relocs, fix _end
  x86, msr: Remove incorrect, duplicated code in the MSR driver
  x86: Merge kernel_thread()
  x86: Sync 32/64-bit kernel_thread
  x86, 32-bit: Use same regs as 64-bit for kernel_thread_helper
  x86, 64-bit: Use user_mode() to determine new stack pointer in copy_thread()
  x86, 64-bit: Move kernel_thread to C
  x86-64, paravirt: Call set_iopl_mask() on 64 bits
  x86-32: Avoid pipeline serialization in PTREGSCALL1 and 2
  x86: Merge sys_clone
  x86, 32-bit: Convert sys_vm86 & sys_vm86old
  x86: Merge sys_sigaltstack
  x86: Merge sys_execve
  x86: Merge sys_iopl
  x86-32: Add new pt_regs stubs
  cpumask: Use modern cpumask style in arch/x86/kernel/cpu/mcheck/mce-inject.c
This commit is contained in:
Linus Torvalds 2009-12-16 12:02:37 -08:00
parent da184a8064 23637568ad
commit 61ecdb84c1
18 changed files with 245 additions and 294 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

89
arch/x86/boot/compressed/relocs.c
View File

@ -9,6 +9,9 @@
#include <byteswap.h>
#define USE_BSD
#include <endian.h>
#include <regex.h>
static void die(char *fmt, ...);
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
static Elf32_Ehdr ehdr;
@ -30,25 +33,47 @@ static struct section *secs;
* the address for which it has been compiled. Don't warn user about
* absolute relocations present w.r.t these symbols.
*/
static const char* safe_abs_relocs[] = {
"xen_irq_disable_direct_reloc",
"xen_save_fl_direct_reloc",
};
static int is_safe_abs_reloc(const char* sym_name)
static const char abs_sym_regex[] =
"^(xen_irq_disable_direct_reloc$|"
"xen_save_fl_direct_reloc$|"
"VDSO|"
"__crc_)";
static regex_t abs_sym_regex_c;
static int is_abs_reloc(const char *sym_name)
{
int i;
return !regexec(&abs_sym_regex_c, sym_name, 0, NULL, 0);
}
for (i = 0; i < ARRAY_SIZE(safe_abs_relocs); i++) {
if (!strcmp(sym_name, safe_abs_relocs[i]))
/* Match found */
return 1;
}
if (strncmp(sym_name, "VDSO", 4) == 0)
return 1;
if (strncmp(sym_name, "__crc_", 6) == 0)
return 1;
return 0;
/*
* These symbols are known to be relative, even if the linker marks them
* as absolute (typically defined outside any section in the linker script.)
*/
static const char rel_sym_regex[] =
"^_end$";
static regex_t rel_sym_regex_c;
static int is_rel_reloc(const char *sym_name)
{
return !regexec(&rel_sym_regex_c, sym_name, 0, NULL, 0);
}
static void regex_init(void)
{
char errbuf[128];
int err;
err = regcomp(&abs_sym_regex_c, abs_sym_regex,
REG_EXTENDED|REG_NOSUB);
if (err) {
regerror(err, &abs_sym_regex_c, errbuf, sizeof errbuf);
die("%s", errbuf);
}
err = regcomp(&rel_sym_regex_c, rel_sym_regex,
REG_EXTENDED|REG_NOSUB);
if (err) {
regerror(err, &rel_sym_regex_c, errbuf, sizeof errbuf);
die("%s", errbuf);
}
}
static void die(char *fmt, ...)
@ -131,7 +156,7 @@ static const char *rel_type(unsigned type)
#undef REL_TYPE
};
const char *name = "unknown type rel type name";
if (type < ARRAY_SIZE(type_name)) {
if (type < ARRAY_SIZE(type_name) && type_name[type]) {
name = type_name[type];
}
return name;
@ -448,7 +473,7 @@ static void print_absolute_relocs(void)
* Before warning check if this absolute symbol
* relocation is harmless.
*/
if (is_safe_abs_reloc(name))
if (is_abs_reloc(name) || is_rel_reloc(name))
continue;
if (!printed) {
@ -501,21 +526,26 @@ static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym))
sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
r_type = ELF32_R_TYPE(rel->r_info);
/* Don't visit relocations to absolute symbols */
if (sym->st_shndx == SHN_ABS) {
if (sym->st_shndx == SHN_ABS &&
!is_rel_reloc(sym_name(sym_strtab, sym))) {
continue;
}
if (r_type == R_386_NONE || r_type == R_386_PC32) {
switch (r_type) {
case R_386_NONE:
case R_386_PC32:
/*
* NONE can be ignored and and PC relative
* relocations don't need to be adjusted.
*/
}
else if (r_type == R_386_32) {
break;
case R_386_32:
/* Visit relocations that need to be adjusted */
visit(rel, sym);
}
else {
die("Unsupported relocation type: %d\n", r_type);
break;
default:
die("Unsupported relocation type: %s (%d)\n",
rel_type(r_type), r_type);
break;
}
}
}
@ -571,16 +601,15 @@ static void emit_relocs(int as_text)
}
else {
unsigned char buf[4];
buf[0] = buf[1] = buf[2] = buf[3] = 0;
/* Print a stop */
printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
fwrite("\0\0\0\0", 4, 1, stdout);
/* Now print each relocation */
for (i = 0; i < reloc_count; i++) {
buf[0] = (relocs[i] >> 0) & 0xff;
buf[1] = (relocs[i] >> 8) & 0xff;
buf[2] = (relocs[i] >> 16) & 0xff;
buf[3] = (relocs[i] >> 24) & 0xff;
printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
fwrite(buf, 4, 1, stdout);
}
}
}
@ -598,6 +627,8 @@ int main(int argc, char **argv)
FILE *fp;
int i;
regex_init();
show_absolute_syms = 0;
show_absolute_relocs = 0;
as_text = 0;

8
arch/x86/include/asm/swiotlb.h
View File

@ -5,13 +5,17 @@
#ifdef CONFIG_SWIOTLB
extern int swiotlb;
extern int pci_swiotlb_init(void);
extern int __init pci_swiotlb_detect(void);
extern void __init pci_swiotlb_init(void);
#else
#define swiotlb 0
static inline int pci_swiotlb_init(void)
static inline int pci_swiotlb_detect(void)
{
return 0;
}
static inline void pci_swiotlb_init(void)
{
}
#endif
static inline void dma_mark_clean(void *addr, size_t size) {}

32
arch/x86/include/asm/syscalls.h
View File

@ -18,16 +18,24 @@
/* Common in X86_32 and X86_64 */
/* kernel/ioport.c */
asmlinkage long sys_ioperm(unsigned long, unsigned long, int);
long sys_iopl(unsigned int, struct pt_regs *);
/* kernel/process.c */
int sys_fork(struct pt_regs *);
int sys_vfork(struct pt_regs *);
long sys_execve(char __user *, char __user * __user *,
char __user * __user *, struct pt_regs *);
long sys_clone(unsigned long, unsigned long, void __user *,
void __user *, struct pt_regs *);
/* kernel/ldt.c */
asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);
/* kernel/signal.c */
long sys_rt_sigreturn(struct pt_regs *);
long sys_sigaltstack(const stack_t __user *, stack_t __user *,
struct pt_regs *);
/* kernel/tls.c */
asmlinkage int sys_set_thread_area(struct user_desc __user *);
@ -35,18 +43,11 @@ asmlinkage int sys_get_thread_area(struct user_desc __user *);
/* X86_32 only */
#ifdef CONFIG_X86_32
/* kernel/ioport.c */
long sys_iopl(struct pt_regs *);
/* kernel/process_32.c */
int sys_clone(struct pt_regs *);
int sys_execve(struct pt_regs *);
/* kernel/signal.c */
asmlinkage int sys_sigsuspend(int, int, old_sigset_t);
asmlinkage int sys_sigaction(int, const struct old_sigaction __user *,
struct old_sigaction __user *);
int sys_sigaltstack(struct pt_regs *);
unsigned long sys_sigreturn(struct pt_regs *);
/* kernel/sys_i386_32.c */
@ -62,28 +63,15 @@ asmlinkage int sys_uname(struct old_utsname __user *);
asmlinkage int sys_olduname(struct oldold_utsname __user *);
/* kernel/vm86_32.c */
int sys_vm86old(struct pt_regs *);
int sys_vm86(struct pt_regs *);
int sys_vm86old(struct vm86_struct __user *, struct pt_regs *);
int sys_vm86(unsigned long, unsigned long, struct pt_regs *);
#else /* CONFIG_X86_32 */
/* X86_64 only */
/* kernel/ioport.c */
asmlinkage long sys_iopl(unsigned int, struct pt_regs *);
/* kernel/process_64.c */
asmlinkage long sys_clone(unsigned long, unsigned long,
void __user *, void __user *,
struct pt_regs *);
asmlinkage long sys_execve(char __user *, char __user * __user *,
char __user * __user *,
struct pt_regs *);
long sys_arch_prctl(int, unsigned long);
/* kernel/signal.c */
asmlinkage long sys_sigaltstack(const stack_t __user *, stack_t __user *,
struct pt_regs *);
/* kernel/sys_x86_64.c */
struct new_utsname;

22
arch/x86/kernel/cpu/mcheck/mce-inject.c
View File

@ -74,7 +74,7 @@ static void raise_exception(struct mce *m, struct pt_regs *pregs)
m->finished = 0;
}
static cpumask_t mce_inject_cpumask;
static cpumask_var_t mce_inject_cpumask;
static int mce_raise_notify(struct notifier_block *self,
unsigned long val, void *data)
@ -82,9 +82,9 @@ static int mce_raise_notify(struct notifier_block *self,
struct die_args *args = (struct die_args *)data;
int cpu = smp_processor_id();
struct mce *m = &__get_cpu_var(injectm);
if (val != DIE_NMI_IPI || !cpu_isset(cpu, mce_inject_cpumask))
if (val != DIE_NMI_IPI || !cpumask_test_cpu(cpu, mce_inject_cpumask))
return NOTIFY_DONE;
cpu_clear(cpu, mce_inject_cpumask);
cpumask_clear_cpu(cpu, mce_inject_cpumask);
if (m->inject_flags & MCJ_EXCEPTION)
raise_exception(m, args->regs);
else if (m->status)
@ -148,22 +148,22 @@ static void raise_mce(struct mce *m)
unsigned long start;
int cpu;
get_online_cpus();
mce_inject_cpumask = cpu_online_map;
cpu_clear(get_cpu(), mce_inject_cpumask);
cpumask_copy(mce_inject_cpumask, cpu_online_mask);
cpumask_clear_cpu(get_cpu(), mce_inject_cpumask);
for_each_online_cpu(cpu) {
struct mce *mcpu = &per_cpu(injectm, cpu);
if (!mcpu->finished ||
MCJ_CTX(mcpu->inject_flags) != MCJ_CTX_RANDOM)
cpu_clear(cpu, mce_inject_cpumask);
cpumask_clear_cpu(cpu, mce_inject_cpumask);
}
if (!cpus_empty(mce_inject_cpumask))
apic->send_IPI_mask(&mce_inject_cpumask, NMI_VECTOR);
if (!cpumask_empty(mce_inject_cpumask))
apic->send_IPI_mask(mce_inject_cpumask, NMI_VECTOR);
start = jiffies;
while (!cpus_empty(mce_inject_cpumask)) {
while (!cpumask_empty(mce_inject_cpumask)) {
if (!time_before(jiffies, start + 2*HZ)) {
printk(KERN_ERR
"Timeout waiting for mce inject NMI %lx\n",
*cpus_addr(mce_inject_cpumask));
*cpumask_bits(mce_inject_cpumask));
break;
}
cpu_relax();
@ -210,6 +210,8 @@ static ssize_t mce_write(struct file *filp, const char __user *ubuf,
static int inject_init(void)
{
if (!alloc_cpumask_var(&mce_inject_cpumask, GFP_KERNEL))
return -ENOMEM;
printk(KERN_INFO "Machine check injector initialized\n");
mce_chrdev_ops.write = mce_write;
register_die_notifier(&mce_raise_nb);

69
arch/x86/kernel/entry_32.S
View File

@ -725,22 +725,61 @@ END(syscall_badsys)
/*
* System calls that need a pt_regs pointer.
*/
#define PTREGSCALL(name) \
#define PTREGSCALL0(name) \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%eax; \
jmp sys_##name;
PTREGSCALL(iopl)
PTREGSCALL(fork)
PTREGSCALL(clone)
PTREGSCALL(vfork)
PTREGSCALL(execve)
PTREGSCALL(sigaltstack)
PTREGSCALL(sigreturn)
PTREGSCALL(rt_sigreturn)
PTREGSCALL(vm86)
PTREGSCALL(vm86old)
#define PTREGSCALL1(name) \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%edx; \
movl (PT_EBX+4)(%esp),%eax; \
jmp sys_##name;
#define PTREGSCALL2(name) \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%ecx; \
movl (PT_ECX+4)(%esp),%edx; \
movl (PT_EBX+4)(%esp),%eax; \
jmp sys_##name;
#define PTREGSCALL3(name) \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%eax; \
pushl %eax; \
movl PT_EDX(%eax),%ecx; \
movl PT_ECX(%eax),%edx; \
movl PT_EBX(%eax),%eax; \
call sys_##name; \
addl $4,%esp; \
ret
PTREGSCALL1(iopl)
PTREGSCALL0(fork)
PTREGSCALL0(vfork)
PTREGSCALL3(execve)
PTREGSCALL2(sigaltstack)
PTREGSCALL0(sigreturn)
PTREGSCALL0(rt_sigreturn)
PTREGSCALL2(vm86)
PTREGSCALL1(vm86old)
/* Clone is an oddball. The 4th arg is in %edi */
ALIGN;
ptregs_clone:
leal 4(%esp),%eax
pushl %eax
pushl PT_EDI(%eax)
movl PT_EDX(%eax),%ecx
movl PT_ECX(%eax),%edx
movl PT_EBX(%eax),%eax
call sys_clone
addl $8,%esp
ret
.macro FIXUP_ESPFIX_STACK
/*
@ -1008,12 +1047,8 @@ END(spurious_interrupt_bug)
ENTRY(kernel_thread_helper)
pushl $0 # fake return address for unwinder
CFI_STARTPROC
movl %edx,%eax
push %edx
CFI_ADJUST_CFA_OFFSET 4
call *%ebx
push %eax
CFI_ADJUST_CFA_OFFSET 4
movl %edi,%eax
call *%esi
call do_exit
ud2 # padding for call trace
CFI_ENDPROC

49
arch/x86/kernel/entry_64.S
View File

@ -1166,63 +1166,20 @@ bad_gs:
jmp 2b
.previous
/*
* Create a kernel thread.
*
* C extern interface:
* extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
*
* asm input arguments:
* rdi: fn, rsi: arg, rdx: flags
*/
ENTRY(kernel_thread)
CFI_STARTPROC
FAKE_STACK_FRAME $child_rip
SAVE_ALL
# rdi: flags, rsi: usp, rdx: will be &pt_regs
movq %rdx,%rdi
orq kernel_thread_flags(%rip),%rdi
movq $-1, %rsi
movq %rsp, %rdx
xorl %r8d,%r8d
xorl %r9d,%r9d
# clone now
call do_fork
movq %rax,RAX(%rsp)
xorl %edi,%edi
/*
* It isn't worth to check for reschedule here,
* so internally to the x86_64 port you can rely on kernel_thread()
* not to reschedule the child before returning, this avoids the need
* of hacks for example to fork off the per-CPU idle tasks.
* [Hopefully no generic code relies on the reschedule -AK]
*/
RESTORE_ALL
UNFAKE_STACK_FRAME
ret
CFI_ENDPROC
END(kernel_thread)
ENTRY(child_rip)
ENTRY(kernel_thread_helper)
pushq $0 # fake return address
CFI_STARTPROC
/*
* Here we are in the child and the registers are set as they were
* at kernel_thread() invocation in the parent.
*/
movq %rdi, %rax
movq %rsi, %rdi
call *%rax
call *%rsi
# exit
mov %eax, %edi
call do_exit
ud2 # padding for call trace
CFI_ENDPROC
END(child_rip)
END(kernel_thread_helper)
/*
* execve(). This function needs to use IRET, not SYSRET, to set up all state properly.

28
arch/x86/kernel/ioport.c
View File

@ -103,9 +103,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
* on system-call entry - see also fork() and the signal handling
* code.
*/
static int do_iopl(unsigned int level, struct pt_regs *regs)
long sys_iopl(unsigned int level, struct pt_regs *regs)
{
unsigned int old = (regs->flags >> 12) & 3;
struct thread_struct *t = &current->thread;
if (level > 3)
return -EINVAL;
@ -115,29 +116,8 @@ static int do_iopl(unsigned int level, struct pt_regs *regs)
return -EPERM;
}
regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12);
t->iopl = level << 12;
set_iopl_mask(t->iopl);
return 0;
}
#ifdef CONFIG_X86_32
long sys_iopl(struct pt_regs *regs)
{
unsigned int level = regs->bx;
struct thread_struct *t = &current->thread;
int rc;
rc = do_iopl(level, regs);
if (rc < 0)
goto out;
t->iopl = level << 12;
set_iopl_mask(t->iopl);
out:
return rc;
}
#else
asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs)
{
return do_iopl(level, regs);
}
#endif

5
arch/x86/kernel/msr.c
View File

@ -172,11 +172,10 @@ static long msr_ioctl(struct file *file, unsigned int ioc, unsigned long arg)
static int msr_open(struct inode *inode, struct file *file)
{
unsigned int cpu = iminor(file->f_path.dentry->d_inode);
struct cpuinfo_x86 *c = &cpu_data(cpu);
unsigned int cpu;
struct cpuinfo_x86 *c;
cpu = iminor(file->f_path.dentry->d_inode);
if (cpu >= nr_cpu_ids || !cpu_online(cpu))
return -ENXIO; /* No such CPU */

9
arch/x86/kernel/pci-dma.c
View File

@ -120,15 +120,12 @@ static void __init dma32_free_bootmem(void)
void __init pci_iommu_alloc(void)
{
int use_swiotlb;
use_swiotlb = pci_swiotlb_init();
#ifdef CONFIG_X86_64
/* free the range so iommu could get some range less than 4G */
dma32_free_bootmem();
#endif
if (use_swiotlb)
return;
if (pci_swiotlb_detect())
goto out;
gart_iommu_hole_init();
@ -138,6 +135,8 @@ void __init pci_iommu_alloc(void)
/* needs to be called after gart_iommu_hole_init */
amd_iommu_detect();
out:
pci_swiotlb_init();
}
void *dma_generic_alloc_coherent(struct device *dev, size_t size,

11
arch/x86/kernel/pci-swiotlb.c
View File

@ -43,12 +43,12 @@ static struct dma_map_ops swiotlb_dma_ops = {
};
/*
* pci_swiotlb_init - initialize swiotlb if necessary
* pci_swiotlb_detect - set swiotlb to 1 if necessary
*
* This returns non-zero if we are forced to use swiotlb (by the boot
* option).
*/
int __init pci_swiotlb_init(void)
int __init pci_swiotlb_detect(void)
{
int use_swiotlb = swiotlb | swiotlb_force;
@ -60,10 +60,13 @@ int __init pci_swiotlb_init(void)
if (swiotlb_force)
swiotlb = 1;
return use_swiotlb;
}
void __init pci_swiotlb_init(void)
{
if (swiotlb) {
swiotlb_init(0);
dma_ops = &swiotlb_dma_ops;
}
return use_swiotlb;
}

70
arch/x86/kernel/process.c
View File

@ -255,6 +255,76 @@ int sys_vfork(struct pt_regs *regs)
NULL, NULL);
}
long
sys_clone(unsigned long clone_flags, unsigned long newsp,
void __user *parent_tid, void __user *child_tid, struct pt_regs *regs)
{
if (!newsp)
newsp = regs->sp;
return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}
/*
* This gets run with %si containing the
* function to call, and %di containing
* the "args".
*/
extern void kernel_thread_helper(void);
/*
* Create a kernel thread
*/
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.si = (unsigned long) fn;
regs.di = (unsigned long) arg;
#ifdef CONFIG_X86_32
regs.ds = __USER_DS;
regs.es = __USER_DS;
regs.fs = __KERNEL_PERCPU;
regs.gs = __KERNEL_STACK_CANARY;
#endif
regs.orig_ax = -1;
regs.ip = (unsigned long) kernel_thread_helper;
regs.cs = __KERNEL_CS | get_kernel_rpl();
regs.flags = X86_EFLAGS_IF | 0x2;
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* sys_execve() executes a new program.
*/
long sys_execve(char __user *name, char __user * __user *argv,
char __user * __user *envp, struct pt_regs *regs)
{
long error;
char *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, argv, envp, regs);
#ifdef CONFIG_X86_32
if (error == 0) {
/* Make sure we don't return using sysenter.. */
set_thread_flag(TIF_IRET);
}
#endif
putname(filename);
return error;
}
/*
* Idle related variables and functions

73
arch/x86/kernel/process_32.c
View File

@ -180,39 +180,6 @@ void show_regs(struct pt_regs *regs)
show_trace(NULL, regs, &regs->sp, regs->bp);
}
/*
* This gets run with %bx containing the
* function to call, and %dx containing
* the "args".
*/
extern void kernel_thread_helper(void);
/*
* Create a kernel thread
*/
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.bx = (unsigned long) fn;
regs.dx = (unsigned long) arg;
regs.ds = __USER_DS;
regs.es = __USER_DS;
regs.fs = __KERNEL_PERCPU;
regs.gs = __KERNEL_STACK_CANARY;
regs.orig_ax = -1;
regs.ip = (unsigned long) kernel_thread_helper;
regs.cs = __KERNEL_CS | get_kernel_rpl();
regs.flags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2;
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
void release_thread(struct task_struct *dead_task)
{
BUG_ON(dead_task->mm);
@ -424,46 +391,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
return prev_p;
}
int sys_clone(struct pt_regs *regs)
{
unsigned long clone_flags;
unsigned long newsp;
int __user *parent_tidptr, *child_tidptr;
clone_flags = regs->bx;
newsp = regs->cx;
parent_tidptr = (int __user *)regs->dx;
child_tidptr = (int __user *)regs->di;
if (!newsp)
newsp = regs->sp;
return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
*/
int sys_execve(struct pt_regs *regs)
{
int error;
char *filename;
filename = getname((char __user *) regs->bx);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename,
(char __user * __user *) regs->cx,
(char __user * __user *) regs->dx,
regs);
if (error == 0) {
/* Make sure we don't return using sysenter.. */
set_thread_flag(TIF_IRET);
}
putname(filename);
out:
return error;
}
#define top_esp (THREAD_SIZE - sizeof(unsigned long))
#define top_ebp (THREAD_SIZE - 2*sizeof(unsigned long))

35
arch/x86/kernel/process_64.c
View File

@ -57,8 +57,6 @@ asmlinkage extern void ret_from_fork(void);
DEFINE_PER_CPU(unsigned long, old_rsp);
static DEFINE_PER_CPU(unsigned char, is_idle);
unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
void idle_notifier_register(struct notifier_block *n)
@ -273,8 +271,9 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
*childregs = *regs;
childregs->ax = 0;
childregs->sp = sp;
if (sp == ~0UL)
if (user_mode(regs))
childregs->sp = sp;
else
childregs->sp = (unsigned long)childregs;
p->thread.sp = (unsigned long) childregs;
@ -508,25 +507,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
return prev_p;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage
long sys_execve(char __user *name, char __user * __user *argv,
char __user * __user *envp, struct pt_regs *regs)
{
long error;
char *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, argv, envp, regs);
putname(filename);
return error;
}
void set_personality_64bit(void)
{
/* inherit personality from parent */
@ -541,15 +521,6 @@ void set_personality_64bit(void)
current->personality &= ~READ_IMPLIES_EXEC;
}
asmlinkage long
sys_clone(unsigned long clone_flags, unsigned long newsp,
void __user *parent_tid, void __user *child_tid, struct pt_regs *regs)
{
if (!newsp)
newsp = regs->sp;
return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}
unsigned long get_wchan(struct task_struct *p)
{
unsigned long stack;

12
arch/x86/kernel/signal.c
View File

@ -545,22 +545,12 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
}
#endif /* CONFIG_X86_32 */
#ifdef CONFIG_X86_32
int sys_sigaltstack(struct pt_regs *regs)
{
const stack_t __user *uss = (const stack_t __user *)regs->bx;
stack_t __user *uoss = (stack_t __user *)regs->cx;
return do_sigaltstack(uss, uoss, regs->sp);
}
#else /* !CONFIG_X86_32 */
asmlinkage long
long
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
struct pt_regs *regs)
{
return do_sigaltstack(uss, uoss, regs->sp);
}
#endif /* CONFIG_X86_32 */
/*
* Do a signal return; undo the signal stack.

11
arch/x86/kernel/vm86_32.c
View File

@ -197,9 +197,8 @@ out:
static int do_vm86_irq_handling(int subfunction, int irqnumber);
static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk);
int sys_vm86old(struct pt_regs *regs)
int sys_vm86old(struct vm86_struct __user *v86, struct pt_regs *regs)
{
struct vm86_struct __user *v86 = (struct vm86_struct __user *)regs->bx;
struct kernel_vm86_struct info; /* declare this _on top_,
* this avoids wasting of stack space.
* This remains on the stack until we
@ -227,7 +226,7 @@ out:
}
int sys_vm86(struct pt_regs *regs)
int sys_vm86(unsigned long cmd, unsigned long arg, struct pt_regs *regs)
{
struct kernel_vm86_struct info; /* declare this _on top_,
* this avoids wasting of stack space.
@ -239,12 +238,12 @@ int sys_vm86(struct pt_regs *regs)
struct vm86plus_struct __user *v86;
tsk = current;
switch (regs->bx) {
switch (cmd) {
case VM86_REQUEST_IRQ:
case VM86_FREE_IRQ:
case VM86_GET_IRQ_BITS:
case VM86_GET_AND_RESET_IRQ:
ret = do_vm86_irq_handling(regs->bx, (int)regs->cx);
ret = do_vm86_irq_handling(cmd, (int)arg);
goto out;
case VM86_PLUS_INSTALL_CHECK:
/*
@ -261,7 +260,7 @@ int sys_vm86(struct pt_regs *regs)
ret = -EPERM;
if (tsk->thread.saved_sp0)
goto out;
v86 = (struct vm86plus_struct __user *)regs->cx;
v86 = (struct vm86plus_struct __user *)arg;
tmp = copy_vm86_regs_from_user(&info.regs, &v86->regs,
offsetof(struct kernel_vm86_struct, regs32) -
sizeof(info.regs));

4
arch/x86/kernel/vmlinux.lds.S
View File

@ -319,9 +319,7 @@ SECTIONS
__brk_limit = .;
}
.end : AT(ADDR(.end) - LOAD_OFFSET) {
_end = .;
}
_end = .;
STABS_DEBUG
DWARF_DEBUG

2
arch/x86/kernel/x8664_ksyms_64.c
View File

@ -17,8 +17,6 @@
EXPORT_SYMBOL(mcount);
#endif
EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
EXPORT_SYMBOL(__get_user_4);

10
arch/x86/tools/gen-insn-attr-x86.awk
View File

@ -226,12 +226,12 @@ function add_flags(old,new) {
}
# convert operands to flags.
function convert_operands(opnd, i,imm,mod)
function convert_operands(count,opnd, i,j,imm,mod)
{
imm = null
mod = null
for (i in opnd) {
i = opnd[i]
for (j = 1; j <= count; j++) {
i = opnd[j]
if (match(i, imm_expr) == 1) {
if (!imm_flag[i])
semantic_error("Unknown imm opnd: " i)
@ -282,8 +282,8 @@ function convert_operands(opnd, i,imm,mod)
# parse one opcode
if (match($i, opnd_expr)) {
opnd = $i
split($(i++), opnds, ",")
flags = convert_operands(opnds)
count = split($(i++), opnds, ",")
flags = convert_operands(count, opnds)
}
if (match($i, ext_expr))
ext = $(i++)