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Diffstat (limited to 'arch/s390/include/asm/uaccess.h')
-rw-r--r--arch/s390/include/asm/uaccess.h398
1 files changed, 111 insertions, 287 deletions
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index f5920163ee97..3e5b8b677057 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -13,125 +13,80 @@
/*
* User space memory access functions
*/
+#include <linux/pgtable.h>
#include <asm/asm-extable.h>
#include <asm/processor.h>
#include <asm/extable.h>
#include <asm/facility.h>
#include <asm-generic/access_ok.h>
+#include <asm/asce.h>
#include <linux/instrumented.h>
void debug_user_asce(int exit);
-union oac {
- unsigned int val;
- struct {
- struct {
- unsigned short key : 4;
- unsigned short : 4;
- unsigned short as : 2;
- unsigned short : 4;
- unsigned short k : 1;
- unsigned short a : 1;
- } oac1;
- struct {
- unsigned short key : 4;
- unsigned short : 4;
- unsigned short as : 2;
- unsigned short : 4;
- unsigned short k : 1;
- unsigned short a : 1;
- } oac2;
- };
-};
-
-static __always_inline __must_check unsigned long
-raw_copy_from_user_key(void *to, const void __user *from, unsigned long size, unsigned long key)
-{
- unsigned long rem;
- union oac spec = {
- .oac2.key = key,
- .oac2.as = PSW_BITS_AS_SECONDARY,
- .oac2.k = 1,
- .oac2.a = 1,
- };
-
- asm_inline volatile(
- " lr %%r0,%[spec]\n"
- "0: mvcos 0(%[to]),0(%[from]),%[size]\n"
- "1: jz 5f\n"
- " algr %[size],%[val]\n"
- " slgr %[from],%[val]\n"
- " slgr %[to],%[val]\n"
- " j 0b\n"
- "2: la %[rem],4095(%[from])\n" /* rem = from + 4095 */
- " nr %[rem],%[val]\n" /* rem = (from + 4095) & -4096 */
- " slgr %[rem],%[from]\n"
- " clgr %[size],%[rem]\n" /* copy crosses next page boundary? */
- " jnh 6f\n"
- "3: mvcos 0(%[to]),0(%[from]),%[rem]\n"
- "4: slgr %[size],%[rem]\n"
- " j 6f\n"
- "5: lghi %[size],0\n"
- "6:\n"
- EX_TABLE(0b, 2b)
- EX_TABLE(1b, 2b)
- EX_TABLE(3b, 6b)
- EX_TABLE(4b, 6b)
- : [size] "+&a" (size), [from] "+&a" (from), [to] "+&a" (to), [rem] "=&a" (rem)
- : [val] "a" (-4096UL), [spec] "d" (spec.val)
- : "cc", "memory", "0");
- return size;
-}
+#ifdef CONFIG_KMSAN
+#define uaccess_kmsan_or_inline noinline __maybe_unused __no_sanitize_memory
+#else
+#define uaccess_kmsan_or_inline __always_inline
+#endif
-static __always_inline __must_check unsigned long
-raw_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- return raw_copy_from_user_key(to, from, n, 0);
-}
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
-static __always_inline __must_check unsigned long
-raw_copy_to_user_key(void __user *to, const void *from, unsigned long size, unsigned long key)
+static uaccess_kmsan_or_inline __must_check unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long size)
{
- unsigned long rem;
- union oac spec = {
- .oac1.key = key,
- .oac1.as = PSW_BITS_AS_SECONDARY,
- .oac1.k = 1,
- .oac1.a = 1,
- };
-
- asm_inline volatile(
- " lr %%r0,%[spec]\n"
- "0: mvcos 0(%[to]),0(%[from]),%[size]\n"
- "1: jz 5f\n"
- " algr %[size],%[val]\n"
- " slgr %[to],%[val]\n"
- " slgr %[from],%[val]\n"
- " j 0b\n"
- "2: la %[rem],4095(%[to])\n" /* rem = to + 4095 */
- " nr %[rem],%[val]\n" /* rem = (to + 4095) & -4096 */
- " slgr %[rem],%[to]\n"
- " clgr %[size],%[rem]\n" /* copy crosses next page boundary? */
- " jnh 6f\n"
- "3: mvcos 0(%[to]),0(%[from]),%[rem]\n"
- "4: slgr %[size],%[rem]\n"
- " j 6f\n"
- "5: lghi %[size],0\n"
- "6:\n"
- EX_TABLE(0b, 2b)
- EX_TABLE(1b, 2b)
- EX_TABLE(3b, 6b)
- EX_TABLE(4b, 6b)
- : [size] "+&a" (size), [to] "+&a" (to), [from] "+&a" (from), [rem] "=&a" (rem)
- : [val] "a" (-4096UL), [spec] "d" (spec.val)
- : "cc", "memory", "0");
- return size;
+ unsigned long osize;
+ int cc;
+
+ while (1) {
+ osize = size;
+ asm_inline volatile(
+ " lhi %%r0,%[spec]\n"
+ "0: mvcos %[to],%[from],%[size]\n"
+ "1: nopr %%r7\n"
+ CC_IPM(cc)
+ EX_TABLE_UA_MVCOS_FROM(0b, 0b)
+ EX_TABLE_UA_MVCOS_FROM(1b, 0b)
+ : CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char *)to)
+ : [spec] "I" (0x81), [from] "Q" (*(const char __user *)from)
+ : CC_CLOBBER_LIST("memory", "0"));
+ if (__builtin_constant_p(osize) && osize <= 4096)
+ return osize - size;
+ if (likely(CC_TRANSFORM(cc) == 0))
+ return osize - size;
+ size -= 4096;
+ to += 4096;
+ from += 4096;
+ }
}
-static __always_inline __must_check unsigned long
-raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+static uaccess_kmsan_or_inline __must_check unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long size)
{
- return raw_copy_to_user_key(to, from, n, 0);
+ unsigned long osize;
+ int cc;
+
+ while (1) {
+ osize = size;
+ asm_inline volatile(
+ " llilh %%r0,%[spec]\n"
+ "0: mvcos %[to],%[from],%[size]\n"
+ "1: nopr %%r7\n"
+ CC_IPM(cc)
+ EX_TABLE_UA_MVCOS_TO(0b, 0b)
+ EX_TABLE_UA_MVCOS_TO(1b, 0b)
+ : CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char __user *)to)
+ : [spec] "I" (0x81), [from] "Q" (*(const char *)from)
+ : CC_CLOBBER_LIST("memory", "0"));
+ if (__builtin_constant_p(osize) && osize <= 4096)
+ return osize - size;
+ if (likely(CC_TRANSFORM(cc) == 0))
+ return osize - size;
+ size -= 4096;
+ to += 4096;
+ from += 4096;
+ }
}
unsigned long __must_check
@@ -158,12 +113,6 @@ copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned lo
int __noreturn __put_user_bad(void);
-#ifdef CONFIG_KMSAN
-#define uaccess_kmsan_or_inline noinline __maybe_unused __no_sanitize_memory
-#else
-#define uaccess_kmsan_or_inline __always_inline
-#endif
-
#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
#define DEFINE_PUT_USER_NOINSTR(type) \
@@ -199,7 +148,7 @@ __put_user_##type##_noinstr(unsigned type __user *to, \
{ \
int rc; \
\
- asm volatile( \
+ asm_inline volatile( \
" llilh %%r0,%[spec]\n" \
"0: mvcos %[to],%[from],%[size]\n" \
"1: lhi %[rc],0\n" \
@@ -315,7 +264,7 @@ __get_user_##type##_noinstr(unsigned type *to, \
{ \
int rc; \
\
- asm volatile( \
+ asm_inline volatile( \
" lhi %%r0,%[spec]\n" \
"0: mvcos %[to],%[from],%[size]\n" \
"1: lhi %[rc],0\n" \
@@ -415,12 +364,34 @@ long __must_check strncpy_from_user(char *dst, const char __user *src, long coun
long __must_check strnlen_user(const char __user *src, long count);
-/*
- * Zero Userspace
- */
-unsigned long __must_check __clear_user(void __user *to, unsigned long size);
+static uaccess_kmsan_or_inline __must_check unsigned long
+__clear_user(void __user *to, unsigned long size)
+{
+ unsigned long osize;
+ int cc;
+
+ while (1) {
+ osize = size;
+ asm_inline volatile(
+ " llilh %%r0,%[spec]\n"
+ "0: mvcos %[to],%[from],%[size]\n"
+ "1: nopr %%r7\n"
+ CC_IPM(cc)
+ EX_TABLE_UA_MVCOS_TO(0b, 0b)
+ EX_TABLE_UA_MVCOS_TO(1b, 0b)
+ : CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char __user *)to)
+ : [spec] "I" (0x81), [from] "Q" (*(const char *)empty_zero_page)
+ : CC_CLOBBER_LIST("memory", "0"));
+ if (__builtin_constant_p(osize) && osize <= 4096)
+ return osize - size;
+ if (CC_TRANSFORM(cc) == 0)
+ return osize - size;
+ size -= 4096;
+ to += 4096;
+ }
+}
-static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
+static __always_inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
{
might_fault();
return __clear_user(to, n);
@@ -502,177 +473,30 @@ do { \
void __cmpxchg_user_key_called_with_bad_pointer(void);
-#define CMPXCHG_USER_KEY_MAX_LOOPS 128
-
-static __always_inline int __cmpxchg_user_key(unsigned long address, void *uval,
- __uint128_t old, __uint128_t new,
- unsigned long key, int size)
+int __cmpxchg_user_key1(unsigned long address, unsigned char *uval,
+ unsigned char old, unsigned char new, unsigned long key);
+int __cmpxchg_user_key2(unsigned long address, unsigned short *uval,
+ unsigned short old, unsigned short new, unsigned long key);
+int __cmpxchg_user_key4(unsigned long address, unsigned int *uval,
+ unsigned int old, unsigned int new, unsigned long key);
+int __cmpxchg_user_key8(unsigned long address, unsigned long *uval,
+ unsigned long old, unsigned long new, unsigned long key);
+int __cmpxchg_user_key16(unsigned long address, __uint128_t *uval,
+ __uint128_t old, __uint128_t new, unsigned long key);
+
+static __always_inline int _cmpxchg_user_key(unsigned long address, void *uval,
+ __uint128_t old, __uint128_t new,
+ unsigned long key, int size)
{
- int rc = 0;
-
switch (size) {
- case 1: {
- unsigned int prev, shift, mask, _old, _new;
- unsigned long count;
-
- shift = (3 ^ (address & 3)) << 3;
- address ^= address & 3;
- _old = ((unsigned int)old & 0xff) << shift;
- _new = ((unsigned int)new & 0xff) << shift;
- mask = ~(0xff << shift);
- asm volatile(
- " spka 0(%[key])\n"
- " sacf 256\n"
- " llill %[count],%[max_loops]\n"
- "0: l %[prev],%[address]\n"
- "1: nr %[prev],%[mask]\n"
- " xilf %[mask],0xffffffff\n"
- " or %[new],%[prev]\n"
- " or %[prev],%[tmp]\n"
- "2: lr %[tmp],%[prev]\n"
- "3: cs %[prev],%[new],%[address]\n"
- "4: jnl 5f\n"
- " xr %[tmp],%[prev]\n"
- " xr %[new],%[tmp]\n"
- " nr %[tmp],%[mask]\n"
- " jnz 5f\n"
- " brct %[count],2b\n"
- "5: sacf 768\n"
- " spka %[default_key]\n"
- EX_TABLE_UA_LOAD_REG(0b, 5b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(1b, 5b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(3b, 5b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(4b, 5b, %[rc], %[prev])
- : [rc] "+&d" (rc),
- [prev] "=&d" (prev),
- [address] "+Q" (*(int *)address),
- [tmp] "+&d" (_old),
- [new] "+&d" (_new),
- [mask] "+&d" (mask),
- [count] "=a" (count)
- : [key] "%[count]" (key << 4),
- [default_key] "J" (PAGE_DEFAULT_KEY),
- [max_loops] "J" (CMPXCHG_USER_KEY_MAX_LOOPS)
- : "memory", "cc");
- *(unsigned char *)uval = prev >> shift;
- if (!count)
- rc = -EAGAIN;
- return rc;
- }
- case 2: {
- unsigned int prev, shift, mask, _old, _new;
- unsigned long count;
-
- shift = (2 ^ (address & 2)) << 3;
- address ^= address & 2;
- _old = ((unsigned int)old & 0xffff) << shift;
- _new = ((unsigned int)new & 0xffff) << shift;
- mask = ~(0xffff << shift);
- asm volatile(
- " spka 0(%[key])\n"
- " sacf 256\n"
- " llill %[count],%[max_loops]\n"
- "0: l %[prev],%[address]\n"
- "1: nr %[prev],%[mask]\n"
- " xilf %[mask],0xffffffff\n"
- " or %[new],%[prev]\n"
- " or %[prev],%[tmp]\n"
- "2: lr %[tmp],%[prev]\n"
- "3: cs %[prev],%[new],%[address]\n"
- "4: jnl 5f\n"
- " xr %[tmp],%[prev]\n"
- " xr %[new],%[tmp]\n"
- " nr %[tmp],%[mask]\n"
- " jnz 5f\n"
- " brct %[count],2b\n"
- "5: sacf 768\n"
- " spka %[default_key]\n"
- EX_TABLE_UA_LOAD_REG(0b, 5b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(1b, 5b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(3b, 5b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(4b, 5b, %[rc], %[prev])
- : [rc] "+&d" (rc),
- [prev] "=&d" (prev),
- [address] "+Q" (*(int *)address),
- [tmp] "+&d" (_old),
- [new] "+&d" (_new),
- [mask] "+&d" (mask),
- [count] "=a" (count)
- : [key] "%[count]" (key << 4),
- [default_key] "J" (PAGE_DEFAULT_KEY),
- [max_loops] "J" (CMPXCHG_USER_KEY_MAX_LOOPS)
- : "memory", "cc");
- *(unsigned short *)uval = prev >> shift;
- if (!count)
- rc = -EAGAIN;
- return rc;
- }
- case 4: {
- unsigned int prev = old;
-
- asm volatile(
- " spka 0(%[key])\n"
- " sacf 256\n"
- "0: cs %[prev],%[new],%[address]\n"
- "1: sacf 768\n"
- " spka %[default_key]\n"
- EX_TABLE_UA_LOAD_REG(0b, 1b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(1b, 1b, %[rc], %[prev])
- : [rc] "+&d" (rc),
- [prev] "+&d" (prev),
- [address] "+Q" (*(int *)address)
- : [new] "d" ((unsigned int)new),
- [key] "a" (key << 4),
- [default_key] "J" (PAGE_DEFAULT_KEY)
- : "memory", "cc");
- *(unsigned int *)uval = prev;
- return rc;
- }
- case 8: {
- unsigned long prev = old;
-
- asm volatile(
- " spka 0(%[key])\n"
- " sacf 256\n"
- "0: csg %[prev],%[new],%[address]\n"
- "1: sacf 768\n"
- " spka %[default_key]\n"
- EX_TABLE_UA_LOAD_REG(0b, 1b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REG(1b, 1b, %[rc], %[prev])
- : [rc] "+&d" (rc),
- [prev] "+&d" (prev),
- [address] "+QS" (*(long *)address)
- : [new] "d" ((unsigned long)new),
- [key] "a" (key << 4),
- [default_key] "J" (PAGE_DEFAULT_KEY)
- : "memory", "cc");
- *(unsigned long *)uval = prev;
- return rc;
- }
- case 16: {
- __uint128_t prev = old;
-
- asm volatile(
- " spka 0(%[key])\n"
- " sacf 256\n"
- "0: cdsg %[prev],%[new],%[address]\n"
- "1: sacf 768\n"
- " spka %[default_key]\n"
- EX_TABLE_UA_LOAD_REGPAIR(0b, 1b, %[rc], %[prev])
- EX_TABLE_UA_LOAD_REGPAIR(1b, 1b, %[rc], %[prev])
- : [rc] "+&d" (rc),
- [prev] "+&d" (prev),
- [address] "+QS" (*(__int128_t *)address)
- : [new] "d" (new),
- [key] "a" (key << 4),
- [default_key] "J" (PAGE_DEFAULT_KEY)
- : "memory", "cc");
- *(__uint128_t *)uval = prev;
- return rc;
- }
+ case 1: return __cmpxchg_user_key1(address, uval, old, new, key);
+ case 2: return __cmpxchg_user_key2(address, uval, old, new, key);
+ case 4: return __cmpxchg_user_key4(address, uval, old, new, key);
+ case 8: return __cmpxchg_user_key8(address, uval, old, new, key);
+ case 16: return __cmpxchg_user_key16(address, uval, old, new, key);
+ default: __cmpxchg_user_key_called_with_bad_pointer();
}
- __cmpxchg_user_key_called_with_bad_pointer();
- return rc;
+ return 0;
}
/**
@@ -704,8 +528,8 @@ static __always_inline int __cmpxchg_user_key(unsigned long address, void *uval,
BUILD_BUG_ON(sizeof(*(__ptr)) != sizeof(*(__uval))); \
might_fault(); \
__chk_user_ptr(__ptr); \
- __cmpxchg_user_key((unsigned long)(__ptr), (void *)(__uval), \
- (old), (new), (key), sizeof(*(__ptr))); \
+ _cmpxchg_user_key((unsigned long)(__ptr), (void *)(__uval), \
+ (old), (new), (key), sizeof(*(__ptr))); \
})
#endif /* __S390_UACCESS_H */
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-27 03:23:23 +0300