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OpenCloudOS-Kernel
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Merge branch 'x86/unify-lib' into x86/core

This commit is contained in:
Ingo Molnar 2008-07-09 15:00:48 +02:00
parent a737abd11a 22cac16707
commit de989ef093
18 changed files with 574 additions and 1076 deletions
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2
arch/x86/Kconfig.cpu
View File

@ -344,7 +344,7 @@ config X86_F00F_BUG
config X86_WP_WORKS_OK
def_bool y
depends on X86_32 && !M386
depends on !M386
config X86_INVLPG
def_bool y

25
arch/x86/ia32/ia32entry.S
View File

@ -116,7 +116,7 @@ ENTRY(ia32_sysenter_target)
pushfq
CFI_ADJUST_CFA_OFFSET 8
/*CFI_REL_OFFSET rflags,0*/
movl 8*3-THREAD_SIZE+threadinfo_sysenter_return(%rsp), %r10d
movl 8*3-THREAD_SIZE+TI_sysenter_return(%rsp), %r10d
CFI_REGISTER rip,r10
pushq $__USER32_CS
CFI_ADJUST_CFA_OFFSET 8
@ -136,8 +136,9 @@ ENTRY(ia32_sysenter_target)
.quad 1b,ia32_badarg
.previous
GET_THREAD_INFO(%r10)
orl $TS_COMPAT,threadinfo_status(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
orl $TS_COMPAT,TI_status(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP), \
TI_flags(%r10)
CFI_REMEMBER_STATE
jnz sysenter_tracesys
sysenter_do_call:
@ -149,9 +150,9 @@ sysenter_do_call:
GET_THREAD_INFO(%r10)
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
jnz int_ret_from_sys_call
andl $~TS_COMPAT,threadinfo_status(%r10)
andl $~TS_COMPAT,TI_status(%r10)
/* clear IF, that popfq doesn't enable interrupts early */
andl $~0x200,EFLAGS-R11(%rsp)
movl RIP-R11(%rsp),%edx /* User %eip */
@ -240,8 +241,9 @@ ENTRY(ia32_cstar_target)
.quad 1b,ia32_badarg
.previous
GET_THREAD_INFO(%r10)
orl $TS_COMPAT,threadinfo_status(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
orl $TS_COMPAT,TI_status(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP), \
TI_flags(%r10)
CFI_REMEMBER_STATE
jnz cstar_tracesys
cstar_do_call:
@ -253,9 +255,9 @@ cstar_do_call:
GET_THREAD_INFO(%r10)
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
jnz int_ret_from_sys_call
andl $~TS_COMPAT,threadinfo_status(%r10)
andl $~TS_COMPAT,TI_status(%r10)
RESTORE_ARGS 1,-ARG_SKIP,1,1,1
movl RIP-ARGOFFSET(%rsp),%ecx
CFI_REGISTER rip,rcx
@ -333,8 +335,9 @@ ENTRY(ia32_syscall)
this could be a problem. */
SAVE_ARGS 0,0,1
GET_THREAD_INFO(%r10)
orl $TS_COMPAT,threadinfo_status(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
orl $TS_COMPAT,TI_status(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP), \
TI_flags(%r10)
jnz ia32_tracesys
ia32_do_syscall:
cmpl $(IA32_NR_syscalls-1),%eax

2
arch/x86/kernel/asm-offsets_64.c
View File

@ -34,7 +34,7 @@ int main(void)
ENTRY(pid);
BLANK();
#undef ENTRY
#define ENTRY(entry) DEFINE(threadinfo_ ## entry, offsetof(struct thread_info, entry))
#define ENTRY(entry) DEFINE(TI_ ## entry, offsetof(struct thread_info, entry))
ENTRY(flags);
ENTRY(addr_limit);
ENTRY(preempt_count);

23
arch/x86/kernel/entry_64.S
View File

@ -168,13 +168,13 @@ ENTRY(ret_from_fork)
CFI_ADJUST_CFA_OFFSET -4
call schedule_tail
GET_THREAD_INFO(%rcx)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx)
jnz rff_trace
rff_action:
RESTORE_REST
testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread?
je int_ret_from_sys_call
testl $_TIF_IA32,threadinfo_flags(%rcx)
testl $_TIF_IA32,TI_flags(%rcx)
jnz int_ret_from_sys_call
RESTORE_TOP_OF_STACK %rdi,ARGOFFSET
jmp ret_from_sys_call
@ -243,7 +243,8 @@ ENTRY(system_call_after_swapgs)
movq %rcx,RIP-ARGOFFSET(%rsp)
CFI_REL_OFFSET rip,RIP-ARGOFFSET
GET_THREAD_INFO(%rcx)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP), \
TI_flags(%rcx)
jnz tracesys
cmpq $__NR_syscall_max,%rax
ja badsys
@ -262,7 +263,7 @@ sysret_check:
GET_THREAD_INFO(%rcx)
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
movl threadinfo_flags(%rcx),%edx
movl TI_flags(%rcx),%edx
andl %edi,%edx
jnz sysret_careful
CFI_REMEMBER_STATE
@ -347,10 +348,10 @@ int_ret_from_sys_call:
int_with_check:
LOCKDEP_SYS_EXIT_IRQ
GET_THREAD_INFO(%rcx)
movl threadinfo_flags(%rcx),%edx
movl TI_flags(%rcx),%edx
andl %edi,%edx
jnz int_careful
andl $~TS_COMPAT,threadinfo_status(%rcx)
andl $~TS_COMPAT,TI_status(%rcx)
jmp retint_swapgs
/* Either reschedule or signal or syscall exit tracking needed. */
@ -558,7 +559,7 @@ retint_with_reschedule:
movl $_TIF_WORK_MASK,%edi
retint_check:
LOCKDEP_SYS_EXIT_IRQ
movl threadinfo_flags(%rcx),%edx
movl TI_flags(%rcx),%edx
andl %edi,%edx
CFI_REMEMBER_STATE
jnz retint_careful
@ -654,9 +655,9 @@ retint_signal:
/* Returning to kernel space. Check if we need preemption */
/* rcx: threadinfo. interrupts off. */
ENTRY(retint_kernel)
cmpl $0,threadinfo_preempt_count(%rcx)
cmpl $0,TI_preempt_count(%rcx)
jnz retint_restore_args
bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx)
bt $TIF_NEED_RESCHED,TI_flags(%rcx)
jnc retint_restore_args
bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */
jnc retint_restore_args
@ -819,7 +820,7 @@ paranoid_restore\trace:
jmp irq_return
paranoid_userspace\trace:
GET_THREAD_INFO(%rcx)
movl threadinfo_flags(%rcx),%ebx
movl TI_flags(%rcx),%ebx
andl $_TIF_WORK_MASK,%ebx
jz paranoid_swapgs\trace
movq %rsp,%rdi /* &pt_regs */
@ -917,7 +918,7 @@ error_exit:
testl %eax,%eax
jne retint_kernel
LOCKDEP_SYS_EXIT_IRQ
movl threadinfo_flags(%rcx),%edx
movl TI_flags(%rcx),%edx
movl $_TIF_WORK_MASK,%edi
andl %edi,%edx
jnz retint_careful

1
arch/x86/kernel/tsc.c
View File

@ -513,6 +513,7 @@ void __init tsc_init(void)
*/
for_each_possible_cpu(cpu)
set_cyc2ns_scale(cpu_khz, cpu);
use_tsc_delay();
if (tsc_disabled > 0)
return;

4
arch/x86/lib/Makefile
View File

@ -4,8 +4,8 @@
obj-$(CONFIG_SMP) := msr-on-cpu.o
lib-y := delay_$(BITS).o
lib-y += usercopy_$(BITS).o getuser_$(BITS).o putuser_$(BITS).o
lib-y := delay.o
lib-y += usercopy_$(BITS).o getuser.o putuser.o
lib-y += memcpy_$(BITS).o
ifeq ($(CONFIG_X86_32),y)

4
arch/x86/lib/copy_user_64.S
View File

@ -40,7 +40,7 @@ ENTRY(copy_to_user)
movq %rdi,%rcx
addq %rdx,%rcx
jc bad_to_user
cmpq threadinfo_addr_limit(%rax),%rcx
cmpq TI_addr_limit(%rax),%rcx
jae bad_to_user
xorl %eax,%eax /* clear zero flag */
ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string
@ -65,7 +65,7 @@ ENTRY(copy_from_user)
movq %rsi,%rcx
addq %rdx,%rcx
jc bad_from_user
cmpq threadinfo_addr_limit(%rax),%rcx
cmpq TI_addr_limit(%rax),%rcx
jae bad_from_user
movl $1,%ecx /* set zero flag */
ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string

17
arch/x86/lib/delay_32.c → arch/x86/lib/delay.c
View File

@ -29,7 +29,7 @@
/* simple loop based delay: */
static void delay_loop(unsigned long loops)
{
__asm__ __volatile__(
asm volatile(
" test %0,%0 \n"
" jz 3f \n"
" jmp 1f \n"
@ -38,9 +38,9 @@ static void delay_loop(unsigned long loops)
"1: jmp 2f \n"
".align 16 \n"
"2: decl %0 \n"
"2: dec %0 \n"
" jnz 2b \n"
"3: decl %0 \n"
"3: dec %0 \n"
: /* we don't need output */
:"a" (loops)
@ -98,7 +98,7 @@ void use_tsc_delay(void)
int __devinit read_current_timer(unsigned long *timer_val)
{
if (delay_fn == delay_tsc) {
rdtscl(*timer_val);
rdtscll(*timer_val);
return 0;
}
return -1;
@ -108,31 +108,30 @@ void __delay(unsigned long loops)
{
delay_fn(loops);
}
EXPORT_SYMBOL(__delay);
inline void __const_udelay(unsigned long xloops)
{
int d0;
xloops *= 4;
__asm__("mull %0"
asm("mull %%edx"
:"=d" (xloops), "=&a" (d0)
:"1" (xloops), "0"
(cpu_data(raw_smp_processor_id()).loops_per_jiffy * (HZ/4)));
__delay(++xloops);
}
EXPORT_SYMBOL(__const_udelay);
void __udelay(unsigned long usecs)
{
__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
}
EXPORT_SYMBOL(__udelay);
void __ndelay(unsigned long nsecs)
{
__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
}
EXPORT_SYMBOL(__delay);
EXPORT_SYMBOL(__const_udelay);
EXPORT_SYMBOL(__udelay);
EXPORT_SYMBOL(__ndelay);

85
arch/x86/lib/delay_64.c
View File

@ -1,85 +0,0 @@
/*
* Precise Delay Loops for x86-64
*
* Copyright (C) 1993 Linus Torvalds
* Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*
* The __delay function must _NOT_ be inlined as its execution time
* depends wildly on alignment on many x86 processors.
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/timex.h>
#include <linux/preempt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/delay.h>
#include <asm/msr.h>
#ifdef CONFIG_SMP
#include <asm/smp.h>
#endif
int __devinit read_current_timer(unsigned long *timer_value)
{
rdtscll(*timer_value);
return 0;
}
void __delay(unsigned long loops)
{
unsigned bclock, now;
int cpu;
preempt_disable();
cpu = smp_processor_id();
rdtscl(bclock);
for (;;) {
rdtscl(now);
if ((now - bclock) >= loops)
break;
/* Allow RT tasks to run */
preempt_enable();
rep_nop();
preempt_disable();
/*
* It is possible that we moved to another CPU, and
* since TSC's are per-cpu we need to calculate
* that. The delay must guarantee that we wait "at
* least" the amount of time. Being moved to another
* CPU could make the wait longer but we just need to
* make sure we waited long enough. Rebalance the
* counter for this CPU.
*/
if (unlikely(cpu != smp_processor_id())) {
loops -= (now - bclock);
cpu = smp_processor_id();
rdtscl(bclock);
}
}
preempt_enable();
}
EXPORT_SYMBOL(__delay);
inline void __const_udelay(unsigned long xloops)
{
__delay(((xloops * HZ *
cpu_data(raw_smp_processor_id()).loops_per_jiffy) >> 32) + 1);
}
EXPORT_SYMBOL(__const_udelay);
void __udelay(unsigned long usecs)
{
__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
}
EXPORT_SYMBOL(__udelay);
void __ndelay(unsigned long nsecs)
{
__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
}
EXPORT_SYMBOL(__ndelay);

87
arch/x86/lib/getuser_64.S → arch/x86/lib/getuser.S
View File

@ -3,6 +3,7 @@
*
* (C) Copyright 1998 Linus Torvalds
* (C) Copyright 2005 Andi Kleen
* (C) Copyright 2008 Glauber Costa
*
* These functions have a non-standard call interface
* to make them more efficient, especially as they
@ -13,14 +14,13 @@
/*
* __get_user_X
*
* Inputs: %rcx contains the address.
* Inputs: %[r|e]ax contains the address.
* The register is modified, but all changes are undone
* before returning because the C code doesn't know about it.
*
* Outputs: %rax is error code (0 or -EFAULT)
* %rdx contains zero-extended value
*
* %r8 is destroyed.
* Outputs: %[r|e]ax is error code (0 or -EFAULT)
* %[r|e]dx contains zero-extended value
*
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
@ -32,78 +32,73 @@
#include <asm/errno.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/asm.h>
.text
ENTRY(__get_user_1)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
cmpq threadinfo_addr_limit(%r8),%rcx
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
1: movzb (%rcx),%edx
xorl %eax,%eax
1: movzb (%_ASM_AX),%edx
xor %eax,%eax
ret
CFI_ENDPROC
ENDPROC(__get_user_1)
ENTRY(__get_user_2)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
addq $1,%rcx
jc 20f
cmpq threadinfo_addr_limit(%r8),%rcx
jae 20f
decq %rcx
2: movzwl (%rcx),%edx
xorl %eax,%eax
add $1,%_ASM_AX
jc bad_get_user
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
2: movzwl -1(%_ASM_AX),%edx
xor %eax,%eax
ret
20: decq %rcx
jmp bad_get_user
CFI_ENDPROC
ENDPROC(__get_user_2)
ENTRY(__get_user_4)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
addq $3,%rcx
jc 30f
cmpq threadinfo_addr_limit(%r8),%rcx
jae 30f
subq $3,%rcx
3: movl (%rcx),%edx
xorl %eax,%eax
add $3,%_ASM_AX
jc bad_get_user
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
3: mov -3(%_ASM_AX),%edx
xor %eax,%eax
ret
30: subq $3,%rcx
jmp bad_get_user
CFI_ENDPROC
ENDPROC(__get_user_4)
#ifdef CONFIG_X86_64
ENTRY(__get_user_8)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
addq $7,%rcx
jc 40f
cmpq threadinfo_addr_limit(%r8),%rcx
jae 40f
subq $7,%rcx
4: movq (%rcx),%rdx
xorl %eax,%eax
add $7,%_ASM_AX
jc bad_get_user
GET_THREAD_INFO(%_ASM_DX)
cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
jae bad_get_user
4: movq -7(%_ASM_AX),%_ASM_DX
xor %eax,%eax
ret
40: subq $7,%rcx
jmp bad_get_user
CFI_ENDPROC
ENDPROC(__get_user_8)
#endif
bad_get_user:
CFI_STARTPROC
xorl %edx,%edx
movq $(-EFAULT),%rax
xor %edx,%edx
mov $(-EFAULT),%_ASM_AX
ret
CFI_ENDPROC
END(bad_get_user)
.section __ex_table,"a"
.quad 1b,bad_get_user
.quad 2b,bad_get_user
.quad 3b,bad_get_user
.quad 4b,bad_get_user
.previous
_ASM_PTR 1b,bad_get_user
_ASM_PTR 2b,bad_get_user
_ASM_PTR 3b,bad_get_user
#ifdef CONFIG_X86_64
_ASM_PTR 4b,bad_get_user
#endif

78
arch/x86/lib/getuser_32.S
View File

@ -1,78 +0,0 @@
/*
* __get_user functions.
*
* (C) Copyright 1998 Linus Torvalds
*
* These functions have a non-standard call interface
* to make them more efficient, especially as they
* return an error value in addition to the "real"
* return value.
*/
#include <linux/linkage.h>
#include <asm/dwarf2.h>
#include <asm/thread_info.h>
/*
* __get_user_X
*
* Inputs: %eax contains the address
*
* Outputs: %eax is error code (0 or -EFAULT)
* %edx contains zero-extended value
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
*/
.text
ENTRY(__get_user_1)
CFI_STARTPROC
GET_THREAD_INFO(%edx)
cmpl TI_addr_limit(%edx),%eax
jae bad_get_user
1: movzbl (%eax),%edx
xorl %eax,%eax
ret
CFI_ENDPROC
ENDPROC(__get_user_1)
ENTRY(__get_user_2)
CFI_STARTPROC
addl $1,%eax
jc bad_get_user
GET_THREAD_INFO(%edx)
cmpl TI_addr_limit(%edx),%eax
jae bad_get_user
2: movzwl -1(%eax),%edx
xorl %eax,%eax
ret
CFI_ENDPROC
ENDPROC(__get_user_2)
ENTRY(__get_user_4)
CFI_STARTPROC
addl $3,%eax
jc bad_get_user
GET_THREAD_INFO(%edx)
cmpl TI_addr_limit(%edx),%eax
jae bad_get_user
3: movl -3(%eax),%edx
xorl %eax,%eax
ret
CFI_ENDPROC
ENDPROC(__get_user_4)
bad_get_user:
CFI_STARTPROC
xorl %edx,%edx
movl $-14,%eax
ret
CFI_ENDPROC
END(bad_get_user)
.section __ex_table,"a"
.long 1b,bad_get_user
.long 2b,bad_get_user
.long 3b,bad_get_user
.previous

73
arch/x86/lib/putuser_32.S → arch/x86/lib/putuser.S
View File

@ -2,6 +2,8 @@
* __put_user functions.
*
* (C) Copyright 2005 Linus Torvalds
* (C) Copyright 2005 Andi Kleen
* (C) Copyright 2008 Glauber Costa
*
* These functions have a non-standard call interface
* to make them more efficient, especially as they
@ -11,6 +13,8 @@
#include <linux/linkage.h>
#include <asm/dwarf2.h>
#include <asm/thread_info.h>
#include <asm/errno.h>
#include <asm/asm.h>
/*
@ -26,73 +30,68 @@
*/
#define ENTER CFI_STARTPROC ; \
pushl %ebx ; \
CFI_ADJUST_CFA_OFFSET 4 ; \
CFI_REL_OFFSET ebx, 0 ; \
GET_THREAD_INFO(%ebx)
#define EXIT popl %ebx ; \
CFI_ADJUST_CFA_OFFSET -4 ; \
CFI_RESTORE ebx ; \
ret ; \
GET_THREAD_INFO(%_ASM_BX)
#define EXIT ret ; \
CFI_ENDPROC
.text
ENTRY(__put_user_1)
ENTER
cmpl TI_addr_limit(%ebx),%ecx
cmp TI_addr_limit(%_ASM_BX),%_ASM_CX
jae bad_put_user
1: movb %al,(%ecx)
xorl %eax,%eax
1: movb %al,(%_ASM_CX)
xor %eax,%eax
EXIT
ENDPROC(__put_user_1)
ENTRY(__put_user_2)
ENTER
movl TI_addr_limit(%ebx),%ebx
subl $1,%ebx
cmpl %ebx,%ecx
mov TI_addr_limit(%_ASM_BX),%_ASM_BX
sub $1,%_ASM_BX
cmp %_ASM_BX,%_ASM_CX
jae bad_put_user
2: movw %ax,(%ecx)
xorl %eax,%eax
2: movw %ax,(%_ASM_CX)
xor %eax,%eax
EXIT
ENDPROC(__put_user_2)
ENTRY(__put_user_4)
ENTER
movl TI_addr_limit(%ebx),%ebx
subl $3,%ebx
cmpl %ebx,%ecx
mov TI_addr_limit(%_ASM_BX),%_ASM_BX
sub $3,%_ASM_BX
cmp %_ASM_BX,%_ASM_CX
jae bad_put_user
3: movl %eax,(%ecx)
xorl %eax,%eax
3: movl %eax,(%_ASM_CX)
xor %eax,%eax
EXIT
ENDPROC(__put_user_4)
ENTRY(__put_user_8)
ENTER
movl TI_addr_limit(%ebx),%ebx
subl $7,%ebx
cmpl %ebx,%ecx
mov TI_addr_limit(%_ASM_BX),%_ASM_BX
sub $7,%_ASM_BX
cmp %_ASM_BX,%_ASM_CX
jae bad_put_user
4: movl %eax,(%ecx)
5: movl %edx,4(%ecx)
xorl %eax,%eax
4: mov %_ASM_AX,(%_ASM_CX)
#ifdef CONFIG_X86_32
5: movl %edx,4(%_ASM_CX)
#endif
xor %eax,%eax
EXIT
ENDPROC(__put_user_8)
bad_put_user:
CFI_STARTPROC simple
CFI_DEF_CFA esp, 2*4
CFI_OFFSET eip, -1*4
CFI_OFFSET ebx, -2*4
movl $-14,%eax
CFI_STARTPROC
movl $-EFAULT,%eax
EXIT
END(bad_put_user)
.section __ex_table,"a"
.long 1b,bad_put_user
.long 2b,bad_put_user
.long 3b,bad_put_user
.long 4b,bad_put_user
.long 5b,bad_put_user
_ASM_PTR 1b,bad_put_user
_ASM_PTR 2b,bad_put_user
_ASM_PTR 3b,bad_put_user
_ASM_PTR 4b,bad_put_user
#ifdef CONFIG_X86_32
_ASM_PTR 5b,bad_put_user
#endif
.previous

106
arch/x86/lib/putuser_64.S
View File

@ -1,106 +0,0 @@
/*
* __put_user functions.
*
* (C) Copyright 1998 Linus Torvalds
* (C) Copyright 2005 Andi Kleen
*
* These functions have a non-standard call interface
* to make them more efficient, especially as they
* return an error value in addition to the "real"
* return value.
*/
/*
* __put_user_X
*
* Inputs: %rcx contains the address
* %rdx contains new value
*
* Outputs: %rax is error code (0 or -EFAULT)
*
* %r8 is destroyed.
*
* These functions should not modify any other registers,
* as they get called from within inline assembly.
*/
#include <linux/linkage.h>
#include <asm/dwarf2.h>
#include <asm/page.h>
#include <asm/errno.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
.text
ENTRY(__put_user_1)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
cmpq threadinfo_addr_limit(%r8),%rcx
jae bad_put_user
1: movb %dl,(%rcx)
xorl %eax,%eax
ret
CFI_ENDPROC
ENDPROC(__put_user_1)
ENTRY(__put_user_2)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
addq $1,%rcx
jc 20f
cmpq threadinfo_addr_limit(%r8),%rcx
jae 20f
decq %rcx
2: movw %dx,(%rcx)
xorl %eax,%eax
ret
20: decq %rcx
jmp bad_put_user
CFI_ENDPROC
ENDPROC(__put_user_2)
ENTRY(__put_user_4)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
addq $3,%rcx
jc 30f
cmpq threadinfo_addr_limit(%r8),%rcx
jae 30f
subq $3,%rcx
3: movl %edx,(%rcx)
xorl %eax,%eax
ret
30: subq $3,%rcx
jmp bad_put_user
CFI_ENDPROC
ENDPROC(__put_user_4)
ENTRY(__put_user_8)
CFI_STARTPROC
GET_THREAD_INFO(%r8)
addq $7,%rcx
jc 40f
cmpq threadinfo_addr_limit(%r8),%rcx
jae 40f
subq $7,%rcx
4: movq %rdx,(%rcx)
xorl %eax,%eax
ret
40: subq $7,%rcx
jmp bad_put_user
CFI_ENDPROC
ENDPROC(__put_user_8)
bad_put_user:
CFI_STARTPROC
movq $(-EFAULT),%rax
ret
CFI_ENDPROC
END(bad_put_user)
.section __ex_table,"a"
.quad 1b,bad_put_user
.quad 2b,bad_put_user
.quad 3b,bad_put_user
.quad 4b,bad_put_user
.previous

9
include/asm-x86/asm.h
View File

@ -3,8 +3,10 @@
#ifdef __ASSEMBLY__
# define __ASM_FORM(x) x
# define __ASM_EX_SEC .section __ex_table
#else
# define __ASM_FORM(x) " " #x " "
# define __ASM_EX_SEC " .section __ex_table,\"a\"\n"
#endif
#ifdef CONFIG_X86_32
@ -14,6 +16,7 @@
#endif
#define __ASM_SIZE(inst) __ASM_SEL(inst##l, inst##q)
#define __ASM_REG(reg) __ASM_SEL(e##reg, r##reg)
#define _ASM_PTR __ASM_SEL(.long, .quad)
#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
@ -24,10 +27,14 @@
#define _ASM_ADD __ASM_SIZE(add)
#define _ASM_SUB __ASM_SIZE(sub)
#define _ASM_XADD __ASM_SIZE(xadd)
#define _ASM_AX __ASM_REG(ax)
#define _ASM_BX __ASM_REG(bx)
#define _ASM_CX __ASM_REG(cx)
#define _ASM_DX __ASM_REG(dx)
/* Exception table entry */
# define _ASM_EXTABLE(from,to) \
" .section __ex_table,\"a\"\n" \
__ASM_EX_SEC \
_ASM_ALIGN "\n" \
_ASM_PTR #from "," #to "\n" \
" .previous\n"

4
include/asm-x86/delay.h
View File

@ -26,10 +26,6 @@ extern void __delay(unsigned long loops);
((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
__ndelay(n))
#ifdef CONFIG_X86_32
void use_tsc_delay(void);
#else
#define use_tsc_delay() {}
#endif
#endif /* _ASM_X86_DELAY_H */

448
include/asm-x86/uaccess.h
View File

@ -1,5 +1,453 @@
#ifndef _ASM_UACCES_H_
#define _ASM_UACCES_H_
/*
* User space memory access functions
*/
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
#include <linux/prefetch.h>
#include <linux/string.h>
#include <asm/asm.h>
#include <asm/page.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons, these macros are grossly misnamed.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(-1UL)
#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define __addr_ok(addr) \
((unsigned long __force)(addr) < \
(current_thread_info()->addr_limit.seg))
/*
* Test whether a block of memory is a valid user space address.
* Returns 0 if the range is valid, nonzero otherwise.
*
* This is equivalent to the following test:
* (u33)addr + (u33)size >= (u33)current->addr_limit.seg (u65 for x86_64)
*
* This needs 33-bit (65-bit for x86_64) arithmetic. We have a carry...
*/
#define __range_not_ok(addr, size) \
({ \
unsigned long flag, roksum; \
__chk_user_ptr(addr); \
asm("add %3,%1 ; sbb %0,%0 ; cmp %1,%4 ; sbb $0,%0" \
: "=&r" (flag), "=r" (roksum) \
: "1" (addr), "g" ((long)(size)), \
"rm" (current_thread_info()->addr_limit.seg)); \
flag; \
})
/**
* access_ok: - Checks if a user space pointer is valid
* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
* to write to a block, it is always safe to read from it.
* @addr: User space pointer to start of block to check
* @size: Size of block to check
*
* Context: User context only. This function may sleep.
*
* Checks if a pointer to a block of memory in user space is valid.
*
* Returns true (nonzero) if the memory block may be valid, false (zero)
* if it is definitely invalid.
*
* Note that, depending on architecture, this function probably just
* checks that the pointer is in the user space range - after calling
* this function, memory access functions may still return -EFAULT.
*/
#define access_ok(type, addr, size) (likely(__range_not_ok(addr, size) == 0))
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry {
unsigned long insn, fixup;
};
extern int fixup_exception(struct pt_regs *regs);
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the ugliness from the user.
*
* The "__xxx" versions of the user access functions are versions that
* do not verify the address space, that must have been done previously
* with a separate "access_ok()" call (this is used when we do multiple
* accesses to the same area of user memory).
*/
extern int __get_user_1(void);
extern int __get_user_2(void);
extern int __get_user_4(void);
extern int __get_user_8(void);
extern int __get_user_bad(void);
#define __get_user_x(size, ret, x, ptr) \
asm volatile("call __get_user_" #size \
: "=a" (ret),"=d" (x) \
: "0" (ptr)) \
/* Careful: we have to cast the result to the type of the pointer
* for sign reasons */
/**
* get_user: - Get a simple variable from user space.
* @x: Variable to store result.
* @ptr: Source address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and the result of
* dereferencing @ptr must be assignable to @x without a cast.
*
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#ifdef CONFIG_X86_32
#define __get_user_8(__ret_gu, __val_gu, ptr) \
__get_user_x(X, __ret_gu, __val_gu, ptr)
#else
#define __get_user_8(__ret_gu, __val_gu, ptr) \
__get_user_x(8, __ret_gu, __val_gu, ptr)
#endif
#define get_user(x, ptr) \
({ \
int __ret_gu; \
unsigned long __val_gu; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_x(1, __ret_gu, __val_gu, ptr); \
break; \
case 2: \
__get_user_x(2, __ret_gu, __val_gu, ptr); \
break; \
case 4: \
__get_user_x(4, __ret_gu, __val_gu, ptr); \
break; \
case 8: \
__get_user_8(__ret_gu, __val_gu, ptr); \
break; \
default: \
__get_user_x(X, __ret_gu, __val_gu, ptr); \
break; \
} \
(x) = (__typeof__(*(ptr)))__val_gu; \
__ret_gu; \
})
#define __put_user_x(size, x, ptr, __ret_pu) \
asm volatile("call __put_user_" #size : "=a" (__ret_pu) \
:"0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#ifdef CONFIG_X86_32
#define __put_user_u64(x, addr, err) \
asm volatile("1: movl %%eax,0(%2)\n" \
"2: movl %%edx,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: movl %3,%0\n" \
" jmp 3b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 4b) \
_ASM_EXTABLE(2b, 4b) \
: "=r" (err) \
: "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))
#define __put_user_x8(x, ptr, __ret_pu) \
asm volatile("call __put_user_8" : "=a" (__ret_pu) \
: "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#else
#define __put_user_u64(x, ptr, retval) \
__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT)
#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
#endif
extern void __put_user_bad(void);
/*
* Strange magic calling convention: pointer in %ecx,
* value in %eax(:%edx), return value in %eax. clobbers %rbx
*/
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);
#ifdef CONFIG_X86_WP_WORKS_OK
/**
* put_user: - Write a simple value into user space.
* @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
* to the result of dereferencing @ptr.
*
* Returns zero on success, or -EFAULT on error.
*/
#define put_user(x, ptr) \
({ \
int __ret_pu; \
__typeof__(*(ptr)) __pu_val; \
__chk_user_ptr(ptr); \
__pu_val = x; \
switch (sizeof(*(ptr))) { \
case 1: \
__put_user_x(1, __pu_val, ptr, __ret_pu); \
break; \
case 2: \
__put_user_x(2, __pu_val, ptr, __ret_pu); \
break; \
case 4: \
__put_user_x(4, __pu_val, ptr, __ret_pu); \
break; \
case 8: \
__put_user_x8(__pu_val, ptr, __ret_pu); \
break; \
default: \
__put_user_x(X, __pu_val, ptr, __ret_pu); \
break; \
} \
__ret_pu; \
})
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
break; \
case 2: \
__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
break; \
case 4: \
__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);\
break; \
case 8: \
__put_user_u64((__typeof__(*ptr))(x), ptr, retval); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
#else
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
__typeof__(*(ptr))__pus_tmp = x; \
retval = 0; \
\
if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
retval = errret; \
} while (0)
#define put_user(x, ptr) \
({ \
int __ret_pu; \
__typeof__(*(ptr))__pus_tmp = x; \
__ret_pu = 0; \
if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \
sizeof(*(ptr))) != 0)) \
__ret_pu = -EFAULT; \
__ret_pu; \
})
#endif
#ifdef CONFIG_X86_32
#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad()
#else
#define __get_user_asm_u64(x, ptr, retval, errret) \
__get_user_asm(x, ptr, retval, "q", "", "=r", errret)
#endif
#define __get_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
break; \
case 2: \
__get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
break; \
case 4: \
__get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \
break; \
case 8: \
__get_user_asm_u64(x, ptr, retval, errret); \
break; \
default: \
(x) = __get_user_bad(); \
} \
} while (0)
#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \
asm volatile("1: mov"itype" %2,%"rtype"1\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: mov %3,%0\n" \
" xor"itype" %"rtype"1,%"rtype"1\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r" (err), ltype(x) \
: "m" (__m(addr)), "i" (errret), "0" (err))
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
__pu_err; \
})
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err; \
unsigned long __gu_val; \
__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
asm volatile("1: mov"itype" %"rtype"1,%2\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: mov %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
/**
* __get_user: - Get a simple variable from user space, with less checking.
* @x: Variable to store result.
* @ptr: Source address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and the result of
* dereferencing @ptr must be assignable to @x without a cast.
*
* Caller must check the pointer with access_ok() before calling this
* function.
*
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
/**
* __put_user: - Write a simple value into user space, with less checking.
* @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
* to the result of dereferencing @ptr.
*
* Caller must check the pointer with access_ok() before calling this
* function.
*
* Returns zero on success, or -EFAULT on error.
*/
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user
/*
* movsl can be slow when source and dest are not both 8-byte aligned
*/
#ifdef CONFIG_X86_INTEL_USERCOPY
extern struct movsl_mask {
int mask;
} ____cacheline_aligned_in_smp movsl_mask;
#endif
#define ARCH_HAS_NOCACHE_UACCESS 1
#ifdef CONFIG_X86_32
# include "uaccess_32.h"
#else
# define ARCH_HAS_SEARCH_EXTABLE
# include "uaccess_64.h"
#endif
#endif

422
include/asm-x86/uaccess_32.h
View File

@ -11,426 +11,6 @@
#include <asm/asm.h>
#include <asm/page.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons, these macros are grossly misnamed.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
/*
* movsl can be slow when source and dest are not both 8-byte aligned
*/
#ifdef CONFIG_X86_INTEL_USERCOPY
extern struct movsl_mask {
int mask;
} ____cacheline_aligned_in_smp movsl_mask;
#endif
#define __addr_ok(addr) \
((unsigned long __force)(addr) < \
(current_thread_info()->addr_limit.seg))
/*
* Test whether a block of memory is a valid user space address.
* Returns 0 if the range is valid, nonzero otherwise.
*
* This is equivalent to the following test:
* (u33)addr + (u33)size >= (u33)current->addr_limit.seg
*
* This needs 33-bit arithmetic. We have a carry...
*/
#define __range_ok(addr, size) \
({ \
unsigned long flag, roksum; \
__chk_user_ptr(addr); \
asm("addl %3,%1 ; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0" \
:"=&r" (flag), "=r" (roksum) \
:"1" (addr), "g" ((int)(size)), \
"rm" (current_thread_info()->addr_limit.seg)); \
flag; \
})
/**
* access_ok: - Checks if a user space pointer is valid
* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
* to write to a block, it is always safe to read from it.
* @addr: User space pointer to start of block to check
* @size: Size of block to check
*
* Context: User context only. This function may sleep.
*
* Checks if a pointer to a block of memory in user space is valid.
*
* Returns true (nonzero) if the memory block may be valid, false (zero)
* if it is definitely invalid.
*
* Note that, depending on architecture, this function probably just
* checks that the pointer is in the user space range - after calling
* this function, memory access functions may still return -EFAULT.
*/
#define access_ok(type, addr, size) (likely(__range_ok(addr, size) == 0))
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry {
unsigned long insn, fixup;
};
extern int fixup_exception(struct pt_regs *regs);
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the ugliness from the user.
*
* The "__xxx" versions of the user access functions are versions that
* do not verify the address space, that must have been done previously
* with a separate "access_ok()" call (this is used when we do multiple
* accesses to the same area of user memory).
*/
extern void __get_user_1(void);
extern void __get_user_2(void);
extern void __get_user_4(void);
#define __get_user_x(size, ret, x, ptr) \
asm volatile("call __get_user_" #size \
:"=a" (ret),"=d" (x) \
:"0" (ptr))
/* Careful: we have to cast the result to the type of the pointer
* for sign reasons */
/**
* get_user: - Get a simple variable from user space.
* @x: Variable to store result.
* @ptr: Source address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and the result of
* dereferencing @ptr must be assignable to @x without a cast.
*
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#define get_user(x, ptr) \
({ \
int __ret_gu; \
unsigned long __val_gu; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_x(1, __ret_gu, __val_gu, ptr); \
break; \
case 2: \
__get_user_x(2, __ret_gu, __val_gu, ptr); \
break; \
case 4: \
__get_user_x(4, __ret_gu, __val_gu, ptr); \
break; \
default: \
__get_user_x(X, __ret_gu, __val_gu, ptr); \
break; \
} \
(x) = (__typeof__(*(ptr)))__val_gu; \
__ret_gu; \
})
extern void __put_user_bad(void);
/*
* Strange magic calling convention: pointer in %ecx,
* value in %eax(:%edx), return value in %eax, no clobbers.
*/
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);
#define __put_user_1(x, ptr) \
asm volatile("call __put_user_1" : "=a" (__ret_pu) \
: "0" ((typeof(*(ptr)))(x)), "c" (ptr))
#define __put_user_2(x, ptr) \
asm volatile("call __put_user_2" : "=a" (__ret_pu) \
: "0" ((typeof(*(ptr)))(x)), "c" (ptr))
#define __put_user_4(x, ptr) \
asm volatile("call __put_user_4" : "=a" (__ret_pu) \
: "0" ((typeof(*(ptr)))(x)), "c" (ptr))
#define __put_user_8(x, ptr) \
asm volatile("call __put_user_8" : "=a" (__ret_pu) \
: "A" ((typeof(*(ptr)))(x)), "c" (ptr))
#define __put_user_X(x, ptr) \
asm volatile("call __put_user_X" : "=a" (__ret_pu) \
: "c" (ptr))
/**
* put_user: - Write a simple value into user space.
* @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
* to the result of dereferencing @ptr.
*
* Returns zero on success, or -EFAULT on error.
*/
#ifdef CONFIG_X86_WP_WORKS_OK
#define put_user(x, ptr) \
({ \
int __ret_pu; \
__typeof__(*(ptr)) __pu_val; \
__chk_user_ptr(ptr); \
__pu_val = x; \
switch (sizeof(*(ptr))) { \
case 1: \
__put_user_1(__pu_val, ptr); \
break; \
case 2: \
__put_user_2(__pu_val, ptr); \
break; \
case 4: \
__put_user_4(__pu_val, ptr); \
break; \
case 8: \
__put_user_8(__pu_val, ptr); \
break; \
default: \
__put_user_X(__pu_val, ptr); \
break; \
} \
__ret_pu; \
})
#else
#define put_user(x, ptr) \
({ \
int __ret_pu; \
__typeof__(*(ptr))__pus_tmp = x; \
__ret_pu = 0; \
if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \
sizeof(*(ptr))) != 0)) \
__ret_pu = -EFAULT; \
__ret_pu; \
})
#endif
/**
* __get_user: - Get a simple variable from user space, with less checking.
* @x: Variable to store result.
* @ptr: Source address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and the result of
* dereferencing @ptr must be assignable to @x without a cast.
*
* Caller must check the pointer with access_ok() before calling this
* function.
*
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
/**
* __put_user: - Write a simple value into user space, with less checking.
* @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
* to the result of dereferencing @ptr.
*
* Caller must check the pointer with access_ok() before calling this
* function.
*
* Returns zero on success, or -EFAULT on error.
*/
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
__pu_err; \
})
#define __put_user_u64(x, addr, err) \
asm volatile("1: movl %%eax,0(%2)\n" \
"2: movl %%edx,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: movl %3,%0\n" \
" jmp 3b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 4b) \
_ASM_EXTABLE(2b, 4b) \
: "=r" (err) \
: "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))
#ifdef CONFIG_X86_WP_WORKS_OK
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
break; \
case 2: \
__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
break; \
case 4: \
__put_user_asm(x, ptr, retval, "l", "", "ir", errret); \
break; \
case 8: \
__put_user_u64((__typeof__(*ptr))(x), ptr, retval); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
#else
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
__typeof__(*(ptr))__pus_tmp = x; \
retval = 0; \
\
if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
retval = errret; \
} while (0)
#endif
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
asm volatile("1: mov"itype" %"rtype"1,%2\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: movl %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype (x), "m" (__m(addr)), "i" (errret), "0" (err))
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err; \
unsigned long __gu_val; \
__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
extern long __get_user_bad(void);
#define __get_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
break; \
case 2: \
__get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
break; \
case 4: \
__get_user_asm(x, ptr, retval, "l", "", "=r", errret); \
break; \
default: \
(x) = __get_user_bad(); \
} \
} while (0)
#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \
asm volatile("1: mov"itype" %2,%"rtype"1\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: movl %3,%0\n" \
" xor"itype" %"rtype"1,%"rtype"1\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r" (err), ltype (x) \
: "m" (__m(addr)), "i" (errret), "0" (err))
unsigned long __must_check __copy_to_user_ll
(void __user *to, const void *from, unsigned long n);
unsigned long __must_check __copy_from_user_ll
@ -576,8 +156,6 @@ __copy_from_user(void *to, const void __user *from, unsigned long n)
return __copy_from_user_ll(to, from, n);
}
#define ARCH_HAS_NOCACHE_UACCESS
static __always_inline unsigned long __copy_from_user_nocache(void *to,
const void __user *from, unsigned long n)
{

260
include/asm-x86/uaccess_64.h
View File

@ -9,265 +9,6 @@
#include <linux/prefetch.h>
#include <asm/page.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons, these macros are grossly misnamed.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFFFFFFFFFUL)
#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define __addr_ok(addr) (!((unsigned long)(addr) & \
(current_thread_info()->addr_limit.seg)))
/*
* Uhhuh, this needs 65-bit arithmetic. We have a carry..
*/
#define __range_not_ok(addr, size) \
({ \
unsigned long flag, roksum; \
__chk_user_ptr(addr); \
asm("# range_ok\n\r" \
"addq %3,%1 ; sbbq %0,%0 ; cmpq %1,%4 ; sbbq $0,%0" \
: "=&r" (flag), "=r" (roksum) \
: "1" (addr), "g" ((long)(size)), \
"g" (current_thread_info()->addr_limit.seg)); \
flag; \
})
#define access_ok(type, addr, size) (__range_not_ok(addr, size) == 0)
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry {
unsigned long insn, fixup;
};
extern int fixup_exception(struct pt_regs *regs);
#define ARCH_HAS_SEARCH_EXTABLE
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the ugliness from the user.
*
* The "__xxx" versions of the user access functions are versions that
* do not verify the address space, that must have been done previously
* with a separate "access_ok()" call (this is used when we do multiple
* accesses to the same area of user memory).
*/
#define __get_user_x(size, ret, x, ptr) \
asm volatile("call __get_user_" #size \
: "=a" (ret),"=d" (x) \
: "c" (ptr) \
: "r8")
/* Careful: we have to cast the result to the type of the pointer
* for sign reasons */
#define get_user(x, ptr) \
({ \
unsigned long __val_gu; \
int __ret_gu; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_x(1, __ret_gu, __val_gu, ptr); \
break; \
case 2: \
__get_user_x(2, __ret_gu, __val_gu, ptr); \
break; \
case 4: \
__get_user_x(4, __ret_gu, __val_gu, ptr); \
break; \
case 8: \
__get_user_x(8, __ret_gu, __val_gu, ptr); \
break; \
default: \
__get_user_bad(); \
break; \
} \
(x) = (__force typeof(*(ptr)))__val_gu; \
__ret_gu; \
})
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);
extern void __put_user_bad(void);
#define __put_user_x(size, ret, x, ptr) \
asm volatile("call __put_user_" #size \
:"=a" (ret) \
:"c" (ptr),"d" (x) \
:"r8")
#define put_user(x, ptr) \
__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user
#define __put_user_nocheck(x, ptr, size) \
({ \
int __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err); \
__pu_err; \
})
#define __put_user_check(x, ptr, size) \
({ \
int __pu_err; \
typeof(*(ptr)) __user *__pu_addr = (ptr); \
switch (size) { \
case 1: \
__put_user_x(1, __pu_err, x, __pu_addr); \
break; \
case 2: \
__put_user_x(2, __pu_err, x, __pu_addr); \
break; \
case 4: \
__put_user_x(4, __pu_err, x, __pu_addr); \
break; \
case 8: \
__put_user_x(8, __pu_err, x, __pu_addr); \
break; \
default: \
__put_user_bad(); \
} \
__pu_err; \
})
#define __put_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__put_user_asm(x, ptr, retval, "b", "b", "iq", -EFAULT);\
break; \
case 2: \
__put_user_asm(x, ptr, retval, "w", "w", "ir", -EFAULT);\
break; \
case 4: \
__put_user_asm(x, ptr, retval, "l", "k", "ir", -EFAULT);\
break; \
case 8: \
__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \
asm volatile("1: mov"itype" %"rtype"1,%2\n" \
"2:\n" \
".section .fixup, \"ax\"\n" \
"3: mov %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype (x), "m" (__m(addr)), "i" (errno), "0" (err))
#define __get_user_nocheck(x, ptr, size) \
({ \
int __gu_err; \
unsigned long __gu_val; \
__get_user_size(__gu_val, (ptr), (size), __gu_err); \
(x) = (__force typeof(*(ptr)))__gu_val; \
__gu_err; \
})
extern int __get_user_1(void);
extern int __get_user_2(void);
extern int __get_user_4(void);
extern int __get_user_8(void);
extern int __get_user_bad(void);
#define __get_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__get_user_asm(x, ptr, retval, "b", "b", "=q", -EFAULT);\
break; \
case 2: \
__get_user_asm(x, ptr, retval, "w", "w", "=r", -EFAULT);\
break; \
case 4: \
__get_user_asm(x, ptr, retval, "l", "k", "=r", -EFAULT);\
break; \
case 8: \
__get_user_asm(x, ptr, retval, "q", "", "=r", -EFAULT); \
break; \
default: \
(x) = __get_user_bad(); \
} \
} while (0)
#define __get_user_asm(x, addr, err, itype, rtype, ltype, errno) \
asm volatile("1: mov"itype" %2,%"rtype"1\n" \
"2:\n" \
".section .fixup, \"ax\"\n" \
"3: mov %3,%0\n" \
" xor"itype" %"rtype"1,%"rtype"1\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r" (err), ltype (x) \
: "m" (__m(addr)), "i"(errno), "0"(err))
/*
* Copy To/From Userspace
*/
@ -437,7 +178,6 @@ __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
return copy_user_generic((__force void *)dst, src, size);
}
#define ARCH_HAS_NOCACHE_UACCESS 1
extern long __copy_user_nocache(void *dst, const void __user *src,
unsigned size, int zerorest);