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Commit a9ffde7e authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[PATCH] s390: system call speedup part 2. 

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

System call speedup part 2.
parent 42aef4b0
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Showing with 279 additions and 439 deletions
include/asm-s390/elf.h
View file @ a9ffde7e
......@@ -155,9 +155,31 @@ typedef s390_regs elf_gregset_t;
/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
now struct_user_regs, they are different) */
#define ELF_CORE_COPY_REGS(pr_reg, regs) \
memcpy(&pr_reg,regs,sizeof(elf_gregset_t)); \
static inline int dump_regs(struct pt_regs *ptregs, elf_gregset_t *regs)
{
memcpy(&regs->psw, &ptregs->psw, sizeof(regs->psw)+sizeof(regs->gprs));
regs->orig_gpr2 = ptregs->orig_gpr2;
return 1;
}
#define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs(regs, &pr_reg);
static inline int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
{
dump_regs(__KSTK_PTREGS(tsk), regs);
memcpy(regs->acrs, tsk->thread.acrs, sizeof(regs->acrs));
return 1;
}
#define ELF_CORE_COPY_TASK_REGS(tsk, regs) dump_task_regs(tsk, regs)
static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
{
memcpy(fpregs, &tsk->thread.fp_regs, sizeof(elf_fpregset_t));
return 1;
}
#define ELF_CORE_COPY_FPREGS(tsk, fpregs) dump_task_fpu(tsk, fpregs)
/* This yields a mask that user programs can use to figure out what
......
include/asm-s390/lowcore.h
View file @ a9ffde7e
......@@ -64,7 +64,10 @@
#ifndef __s390x__
#define __LC_KERNEL_STACK 0xC40
#define __LC_ASYNC_STACK 0xC44
#define __LC_THREAD_INFO 0xC44
#define __LC_ASYNC_STACK 0xC48
#define __LC_KERNEL_ASCE 0xC4C
#define __LC_USER_ASCE 0xC50
#define __LC_CPUID 0xC60
#define __LC_CPUADDR 0xC68
#define __LC_IPLDEV 0xC7C
......@@ -73,13 +76,16 @@
#define __LC_INT_CLOCK 0xC98
#else /* __s390x__ */
#define __LC_KERNEL_STACK 0xD40
#define __LC_ASYNC_STACK 0xD48
#define __LC_THREAD_INFO 0xD48
#define __LC_ASYNC_STACK 0xD50
#define __LC_KERNEL_ASCE 0xD58
#define __LC_USER_ASCE 0xD60
#define __LC_CPUID 0xD90
#define __LC_CPUADDR 0xD98
#define __LC_IPLDEV 0xDB8
#define __LC_JIFFY_TIMER 0xDC0
#define __LC_CURRENT 0xDD8
#define __LC_INT_CLOCK 0xDE8
#define __LC_INT_CLOCK 0xDe8
#endif /* __s390x__ */
#define __LC_PANIC_MAGIC 0xE00
......@@ -99,7 +105,6 @@
#include <linux/config.h>
#include <asm/processor.h>
#include <linux/types.h>
#include <asm/atomic.h>
#include <asm/sigp.h>
void restart_int_handler(void);
......@@ -167,9 +172,12 @@ struct _lowcore
/* System info area */
__u32 save_area[16]; /* 0xc00 */
__u32 kernel_stack; /* 0xc40 */
__u32 async_stack; /* 0xc44 */
__u32 thread_info; /* 0xc44 */
__u32 async_stack; /* 0xc48 */
__u32 kernel_asce; /* 0xc4c */
__u32 user_asce; /* 0xc50 */
__u8 pad10[0xc60-0xc54]; /* 0xc54 */
/* entry.S sensitive area start */
__u8 pad10[0xc60-0xc48]; /* 0xc5c */
struct cpuinfo_S390 cpu_data; /* 0xc60 */
__u32 ipl_device; /* 0xc7c */
/* entry.S sensitive area end */
......@@ -245,9 +253,12 @@ struct _lowcore
__u64 save_area[16]; /* 0xc00 */
__u8 pad9[0xd40-0xc80]; /* 0xc80 */
__u64 kernel_stack; /* 0xd40 */
__u64 async_stack; /* 0xd48 */
__u64 thread_info; /* 0xd48 */
__u64 async_stack; /* 0xd50 */
__u64 kernel_asce; /* 0xd58 */
__u64 user_asce; /* 0xd60 */
__u8 pad10[0xd80-0xd68]; /* 0xd68 */
/* entry.S sensitive area start */
__u8 pad10[0xd80-0xd50]; /* 0xd64 */
struct cpuinfo_S390 cpu_data; /* 0xd80 */
__u32 ipl_device; /* 0xdb8 */
__u32 pad11; /* 0xdbc */
......
include/asm-s390/mmu_context.h
View file @ a9ffde7e
......@@ -24,22 +24,19 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
unsigned long pgd;
if (prev != next) {
#ifndef __s390x__
pgd = (__pa(next->pgd)&PAGE_MASK) |
S390_lowcore.user_asce = (__pa(next->pgd)&PAGE_MASK) |
(_SEGMENT_TABLE|USER_STD_MASK);
/* Load page tables */
asm volatile(" lctl 7,7,%0\n" /* secondary space */
" lctl 13,13,%0\n" /* home space */
: : "m" (pgd) );
/* Load home space page table origin. */
asm volatile("lctl 13,13,%0"
: : "m" (S390_lowcore.user_asce) );
#else /* __s390x__ */
pgd = (__pa(next->pgd)&PAGE_MASK) | (_REGION_TABLE|USER_STD_MASK);
/* Load page tables */
asm volatile(" lctlg 7,7,%0\n" /* secondary space */
" lctlg 13,13,%0\n" /* home space */
: : "m" (pgd) );
S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
(_REGION_TABLE|USER_STD_MASK);
/* Load home space page table origin. */
asm volatile("lctlg 13,13,%0"
: : "m" (S390_lowcore.user_asce) );
#endif /* __s390x__ */
}
cpu_set(smp_processor_id(), next->cpu_vm_mask);
......@@ -51,6 +48,7 @@ extern inline void activate_mm(struct mm_struct *prev,
struct mm_struct *next)
{
switch_mm(prev, next, current);
set_fs(current->thread.mm_segment);
}
#endif
include/asm-s390/processor.h
View file @ a9ffde7e
......@@ -82,10 +82,10 @@ typedef struct {
*/
struct thread_struct {
s390_fp_regs fp_regs;
unsigned int ar2; /* kernel access register 2 */
unsigned int ar4; /* kernel access register 4 */
unsigned int acrs[NUM_ACRS];
unsigned long ksp; /* kernel stack pointer */
unsigned long user_seg; /* HSTD */
mm_segment_t mm_segment;
unsigned long prot_addr; /* address of protection-excep. */
unsigned int error_code; /* error-code of last prog-excep. */
unsigned int trap_no;
......@@ -106,9 +106,10 @@ typedef struct thread_struct thread_struct;
#define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
{0},{0},{0},{0},{0},{0}}}, \
0, 0, \
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
sizeof(init_stack) + (unsigned long) &init_stack, \
__SWAPPER_PG_DIR, \
{0}, \
0,0,0, \
(per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
0, 0 \
......@@ -167,7 +168,7 @@ extern void show_trace(struct task_struct *task, unsigned long *sp);
unsigned long get_wchan(struct task_struct *p);
#define __KSTK_PTREGS(tsk) ((struct pt_regs *) \
(((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)) & -8L))
((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)))
#define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr)
#define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15])
......
include/asm-s390/ptrace.h
View file @ a9ffde7e
......@@ -286,10 +286,7 @@ typedef struct
((NEW) & (PSW_MASK_CC|PSW_MASK_PM)))
/*
* The first entries in pt_regs and user_regs_struct
* are common for the two structures. The s390_regs structure
* covers the common parts. It simplifies copying the common part
* between the three structures.
* The s390_regs structure is used to define the elf_gregset_t.
*/
typedef struct
{
......@@ -299,6 +296,7 @@ typedef struct
unsigned long orig_gpr2;
} s390_regs;
#ifdef __KERNEL__
/*
* The pt_regs struct defines the way the registers are stored on
* the stack during a system call.
......@@ -307,11 +305,11 @@ struct pt_regs
{
psw_t psw;
unsigned long gprs[NUM_GPRS];
unsigned int acrs[NUM_ACRS];
unsigned long orig_gpr2;
unsigned short ilc;
unsigned short trap;
} __attribute__ ((packed));
};
#endif
/*
* Now for the program event recording (trace) definitions.
......
include/asm-s390/system.h
View file @ a9ffde7e
......@@ -83,14 +83,33 @@ static inline void restore_fp_regs(s390_fp_regs *fpregs)
: : "a" (fpregs), "m" (*fpregs) );
}
static inline void save_access_regs(unsigned int *acrs)
{
asm volatile ("stam 0,15,0(%0)" : : "a" (acrs) : "memory" );
}
static inline void restore_access_regs(unsigned int *acrs)
{
asm volatile ("lam 0,15,0(%0)" : : "a" (acrs) );
}
#define switch_to(prev,next,last) do { \
if (prev == next) \
break; \
save_fp_regs(&prev->thread.fp_regs); \
restore_fp_regs(&next->thread.fp_regs); \
save_access_regs(&prev->thread.acrs[0]); \
restore_access_regs(&next->thread.acrs[0]); \
prev = __switch_to(prev,next); \
} while (0)
#define prepare_arch_switch(rq, next) do { } while(0)
#define task_running(rq, p) ((rq)->curr == (p))
#define finish_arch_switch(rq, prev) do { \
set_fs(current->thread.mm_segment); \
spin_unlock_irq(&(rq)->lock); \
} while (0)
#define nop() __asm__ __volatile__ ("nop")
#define xchg(ptr,x) \
......
include/asm-s390/uaccess.h
View file @ a9ffde7e
......@@ -36,10 +36,27 @@
#define USER_DS MAKE_MM_SEG(1)
#define get_ds() (KERNEL_DS)
#define get_fs() ({ mm_segment_t __x; \
asm volatile("ear %0,4":"=a" (__x)); \
__x;})
#define set_fs(x) ({asm volatile("sar 4,%0"::"a" ((x).ar4));})
#define get_fs() (current->thread.mm_segment)
#ifdef __s390x__
#define set_fs(x) \
({ \
unsigned long __pto; \
current->thread.mm_segment = (x); \
__pto = current->thread.mm_segment.ar4 ? \
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
asm volatile ("lctlg 7,7,%0" : : "m" (__pto) ); \
})
#else
#define set_fs(x) \
({ \
unsigned long __pto; \
current->thread.mm_segment = (x); \
__pto = current->thread.mm_segment.ar4 ? \
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
asm volatile ("lctl 7,7,%0" : : "m" (__pto) ); \
})
#endif
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
......@@ -71,126 +88,64 @@ struct exception_table_entry
unsigned long insn, fixup;
};
/*
* Standard fixup section for uaccess inline functions.
* local label 0: is the fault point
* local label 1: is the return point
* %0 is the error variable
* %3 is the error value -EFAULT
*/
#ifndef __s390x__
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
"8: sacf 0\n" \
" lhi %0,%h3\n" \
" bras 4,9f\n" \
"2: lhi %0,%4\n" \
" bras 1,3f\n" \
" .long 1b\n" \
"9: l 4,0(4)\n" \
" br 4\n" \
"3: l 1,0(1)\n" \
" br 1\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 0b,8b\n" \
" .long 0b,2b\n" \
".previous"
#define __uaccess_clobber "cc", "1"
#else /* __s390x__ */
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
"9: sacf 0\n" \
" lhi %0,%h3\n" \
"2: lghi %0,%4\n" \
" jg 1b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
" .quad 0b,9b\n" \
" .quad 0b,2b\n" \
".previous"
#define __uaccess_clobber "cc"
#endif /* __s390x__ */
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#ifndef __s390x__
#define __put_user_asm_8(x, ptr, err) \
({ \
register __typeof__(x) const * __from asm("2"); \
register __typeof__(*(ptr)) * __to asm("4"); \
__from = &(x); \
__to = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: mvc 0(8,%1),0(%2)\n" \
" sacf 0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err) \
: "a" (__to),"a" (__from),"K" (-EFAULT),"0" (0),\
"m" (x) : "cc" ); \
})
#else /* __s390x__ */
#define __put_user_asm_8(x, ptr, err) \
({ \
register __typeof__(*(ptr)) * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: stg %2,0(%1)\n" \
" sacf 0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err) \
: "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
: "cc" ); \
})
#endif /* __s390x__ */
#define __put_user_asm_4(x, ptr, err) \
#if __GNUC__ > 2
#define __put_user_asm(x, ptr, err) \
({ \
register __typeof__(*(ptr)) * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: st %2,0(%1)\n" \
" sacf 0\n" \
err = 0; \
asm volatile( \
"0: mvcs 0(%1,%2),%3,%0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err) \
: "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
: "cc" ); \
: "+&d" (err) \
: "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x), \
"K" (-EFAULT) \
: __uaccess_clobber ); \
})
#define __put_user_asm_2(x, ptr, err) \
({ \
register __typeof__(*(ptr)) * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: sth %2,0(%1)\n" \
" sacf 0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err) \
: "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
: "cc" ); \
})
#define __put_user_asm_1(x, ptr, err) \
#else
#define __put_user_asm(x, ptr, err) \
({ \
register __typeof__(*(ptr)) * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: stc %2,0(%1)\n" \
" sacf 0\n" \
err = 0; \
asm volatile( \
"0: mvcs 0(%1,%2),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err) \
: "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
: "cc" ); \
: "+&d" (err) \
: "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)), \
"K" (-EFAULT), "m" (x) \
: __uaccess_clobber ); \
})
#endif
#define __put_user(x, ptr) \
({ \
......@@ -198,16 +153,10 @@ struct exception_table_entry
int __pu_err; \
switch (sizeof (*(ptr))) { \
case 1: \
__put_user_asm_1(__x, ptr, __pu_err); \
break; \
case 2: \
__put_user_asm_2(__x, ptr, __pu_err); \
break; \
case 4: \
__put_user_asm_4(__x, ptr, __pu_err); \
break; \
case 8: \
__put_user_asm_8(__x, ptr, __pu_err); \
__put_user_asm(__x, ptr, __pu_err); \
break; \
default: \
__pu_err = __put_user_bad(); \
......@@ -225,90 +174,33 @@ struct exception_table_entry
extern int __put_user_bad(void);
#ifndef __s390x__
#define __get_user_asm_8(x, ptr, err) \
#if __GNUC__ > 2
#define __get_user_asm(x, ptr, err) \
({ \
register __typeof__(*(ptr)) const * __from asm("4"); \
register __typeof__(x) * __to asm("2"); \
__from = (ptr); \
__to = &(x); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: mvc 0(8,%2),0(%4)\n" \
" sacf 0\n" \
err = 0; \
asm volatile ( \
"0: mvcp %O1(%2,%R1),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err), "=m" (x) \
: "a" (__to),"K" (-EFAULT),"a" (__from),"0" (0) \
: "cc" ); \
: "+&d" (err), "=Q" (x) \
: "d" (sizeof(*(ptr))), "a" (ptr), \
"K" (-EFAULT) \
: __uaccess_clobber ); \
})
#else /* __s390x__ */
#define __get_user_asm_8(x, ptr, err) \
({ \
register __typeof__(*(ptr)) const * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: lg %1,0(%2)\n" \
" sacf 0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err), "=d" (x) \
: "a" (__ptr), "K" (-EFAULT), "0" (0) \
: "cc" ); \
})
#endif /* __s390x__ */
#define __get_user_asm_4(x, ptr, err) \
({ \
register __typeof__(*(ptr)) const * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: l %1,0(%2)\n" \
" sacf 0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err), "=d" (x) \
: "a" (__ptr), "K" (-EFAULT), "0" (0) \
: "cc" ); \
})
#define __get_user_asm_2(x, ptr, err) \
({ \
register __typeof__(*(ptr)) const * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sacf 512\n" \
"0: lh %1,0(%2)\n" \
" sacf 0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err), "=d" (x) \
: "a" (__ptr), "K" (-EFAULT), "0" (0) \
: "cc" ); \
})
#define __get_user_asm_1(x, ptr, err) \
#else
#define __get_user_asm(x, ptr, err) \
({ \
register __typeof__(*(ptr)) const * __ptr asm("4"); \
__ptr = (ptr); \
__asm__ __volatile__ ( \
" sr %1,%1\n" \
" sacf 512\n" \
"0: ic %1,0(%2)\n" \
" sacf 0\n" \
err = 0; \
asm volatile ( \
"0: mvcp 0(%2,%5),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "=&d" (err), "=&d" (x) \
: "a" (__ptr), "K" (-EFAULT), "0" (0) \
: "cc" ); \
: "+&d" (err), "=m" (x) \
: "d" (sizeof(*(ptr))), "a" (ptr), \
"K" (-EFAULT), "a" (&(x)) \
: __uaccess_clobber ); \
})
#endif
#define __get_user(x, ptr) \
({ \
......@@ -316,16 +208,10 @@ extern int __put_user_bad(void);
int __gu_err; \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm_1(__x, ptr, __gu_err); \
break; \
case 2: \
__get_user_asm_2(__x, ptr, __gu_err); \
break; \
case 4: \
__get_user_asm_4(__x, ptr, __gu_err); \
break; \
case 8: \
__get_user_asm_8(__x, ptr, __gu_err); \
__get_user_asm(__x, ptr, __gu_err); \
break; \
default: \
__x = 0; \
......@@ -344,149 +230,123 @@ extern int __put_user_bad(void);
extern int __get_user_bad(void);
/*
* access register are set up, that 4 points to secondary (user),
* 2 to primary (kernel)
*/
extern long __copy_to_user_asm(const void *from, long n, void *to);
extern long __copy_to_user_asm(const void *from, long n, const void *to);
#define __copy_to_user(to, from, n) \
({ \
__copy_to_user_asm(from, n, to); \
})
/**
* __copy_to_user: - Copy a block of data into user space, with less checking.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from kernel space to user space. Caller must check
* the specified block with access_ok() before calling this function.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
static inline unsigned long
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
return __copy_to_user_asm(from, n, to);
}
#define copy_to_user(to, from, n) \
({ \
long err = 0; \
__typeof__(n) __n = (n); \
might_sleep(); \
if (__access_ok(to,__n)) { \
err = __copy_to_user_asm(from, __n, to); \
} \
else \
err = __n; \
err; \
})
/**
* copy_to_user: - Copy a block of data into user space.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from kernel space to user space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
static inline unsigned long
copy_to_user(void __user *to, const void *from, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_WRITE, to, n))
n = __copy_to_user(to, from, n);
return n;
}
extern long __copy_from_user_asm(void *to, long n, const void *from);
#define __copy_from_user(to, from, n) \
({ \
__copy_from_user_asm(to, n, from); \
})
#define copy_from_user(to, from, n) \
({ \
long err = 0; \
__typeof__(n) __n = (n); \
might_sleep(); \
if (__access_ok(from,__n)) { \
err = __copy_from_user_asm(to, __n, from); \
} \
else \
err = __n; \
err; \
})
extern long __copy_in_user_asm(const void *from, long n, void *to);
#define __copy_in_user(to, from, n) \
({ \
__copy_in_user_asm(from, n, to); \
})
#define copy_in_user(to, from, n) \
({ \
long err = 0; \
__typeof__(n) __n = (n); \
might_sleep(); \
if (__access_ok(from,__n) && __access_ok(to,__n)) { \
err = __copy_in_user_asm(from, __n, to); \
} \
else \
err = __n; \
err; \
})
/**
* __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from user space to kernel space. Caller must check
* the specified block with access_ok() before calling this function.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
static inline unsigned long
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
return __copy_from_user_asm(to, n, from);
}
/*
* Copy a null terminated string from userspace.
/**
* copy_from_user: - Copy a block of data from user space.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from user space to kernel space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
else
memset(to, 0, n);
return n;
}
#ifndef __s390x__
extern long __copy_in_user_asm(const void *from, long n, void *to);
static inline long
__strncpy_from_user(char *dst, const char *src, long count)
static inline unsigned long
__copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
int len;
__asm__ __volatile__ (
" slr %0,%0\n"
" lr 2,%1\n"
" lr 4,%2\n"
" slr 3,3\n"
" sacf 512\n"
"0: ic 3,0(%0,4)\n"
"1: stc 3,0(%0,2)\n"
" ltr 3,3\n"
" jz 2f\n"
" ahi %0,1\n"
" clr %0,%3\n"
" jl 0b\n"
"2: sacf 0\n"
".section .fixup,\"ax\"\n"
"3: lhi %0,%h4\n"
" basr 3,0\n"
" l 3,4f-.(3)\n"
" br 3\n"
"4: .long 2b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,3b\n"
" .long 1b,3b\n"
".previous"
: "=&a" (len)
: "a" (dst), "d" (src), "d" (count), "K" (-EFAULT)
: "2", "3", "4", "memory", "cc" );
return len;
__copy_in_user_asm(from, n, to);
}
#else /* __s390x__ */
static inline long
__strncpy_from_user(char *dst, const char *src, long count)
static inline unsigned long
copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
long len;
__asm__ __volatile__ (
" slgr %0,%0\n"
" lgr 2,%1\n"
" lgr 4,%2\n"
" slr 3,3\n"
" sacf 512\n"
"0: ic 3,0(%0,4)\n"
"1: stc 3,0(%0,2)\n"
" ltr 3,3\n"
" jz 2f\n"
" aghi %0,1\n"
" cgr %0,%3\n"
" jl 0b\n"
"2: sacf 0\n"
".section .fixup,\"ax\"\n"
"3: lghi %0,%h4\n"
" jg 2b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,3b\n"
" .quad 1b,3b\n"
".previous"
: "=&a" (len)
: "a" (dst), "d" (src), "d" (count), "K" (-EFAULT)
: "cc", "2" ,"3", "4" );
return len;
might_sleep();
if (__access_ok(from,n) && __access_ok(to,n))
n = __copy_in_user_asm(from, n, to);
return n;
}
#endif /* __s390x__ */
/*
* Copy a null terminated string from userspace.
*/
extern long __strncpy_from_user_asm(char *dst, const char *src, long count);
static inline long
strncpy_from_user(char *dst, const char *src, long count)
......@@ -494,104 +354,34 @@ strncpy_from_user(char *dst, const char *src, long count)
long res = -EFAULT;
might_sleep();
if (access_ok(VERIFY_READ, src, 1))
res = __strncpy_from_user(dst, src, count);
res = __strncpy_from_user_asm(dst, src, count);
return res;
}
/*
* Return the size of a string (including the ending 0)
*
* Return 0 for error
*/
#ifndef __s390x__
extern long __strnlen_user_asm(const char *src, long count);
static inline unsigned long
strnlen_user(const char * src, unsigned long n)
{
might_sleep();
__asm__ __volatile__ (
" alr %0,%1\n"
" slr 0,0\n"
" lr 4,%1\n"
" sacf 512\n"
"0: srst %0,4\n"
" jo 0b\n"
" slr %0,%1\n"
" ahi %0,1\n"
" sacf 0\n"
"1:\n"
".section .fixup,\"ax\"\n"
"2: sacf 0\n"
" slr %0,%0\n"
" bras 4,3f\n"
" .long 1b\n"
"3: l 4,0(4)\n"
" br 4\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,2b\n"
".previous"
: "+&a" (n) : "d" (src)
: "cc", "0", "4" );
return n;
return __strnlen_user_asm(src, n);
}
#else /* __s390x__ */
static inline unsigned long
strnlen_user(const char * src, unsigned long n)
{
might_sleep();
#if 0
__asm__ __volatile__ (
" algr %0,%1\n"
" slgr 0,0\n"
" lgr 4,%1\n"
" sacf 512\n"
"0: srst %0,4\n"
" jo 0b\n"
" slgr %0,%1\n"
" aghi %0,1\n"
"1: sacf 0\n"
".section .fixup,\"ax\"\n"
"2: slgr %0,%0\n"
" jg 1b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,2b\n"
".previous"
: "+&a" (n) : "d" (src)
: "cc", "0", "4" );
#else
__asm__ __volatile__ (
" lgr 4,%1\n"
" sacf 512\n"
"0: cli 0(4),0x00\n"
" la 4,1(4)\n"
" je 1f\n"
" brctg %0,0b\n"
"1: lgr %0,4\n"
" slgr %0,%1\n"
"2: sacf 0\n"
".section .fixup,\"ax\"\n"
"3: slgr %0,%0\n"
" jg 2b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,3b\n"
".previous"
: "+&a" (n) : "d" (src)
: "cc", "4" );
#endif
return n;
}
#endif /* __s390x__ */
/**
* strlen_user: - Get the size of a string in user space.
* @str: The string to measure.
*
* Context: User context only. This function may sleep.
*
* Get the size of a NUL-terminated string in user space.
*
* Returns the size of the string INCLUDING the terminating NUL.
* On exception, returns 0.
*
* If there is a limit on the length of a valid string, you may wish to
* consider using strnlen_user() instead.
*/
#define strlen_user(str) strnlen_user(str, ~0UL)
/*
......@@ -600,17 +390,18 @@ strnlen_user(const char * src, unsigned long n)
extern long __clear_user_asm(void *to, long n);
#define __clear_user(to, n) \
({ \
__clear_user_asm(to, n); \
})
static inline unsigned long
__clear_user(void *to, unsigned long n)
{
return __clear_user_asm(to, n);
}
static inline unsigned long
clear_user(void *to, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_WRITE, to, n))
n = __clear_user(to, n);
n = __clear_user_asm(to, n);
return n;
}
......
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