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-rw-r--r--arch/s390/include/asm/asm-extable.h91
-rw-r--r--arch/s390/include/asm/uaccess.h72
-rw-r--r--arch/s390/mm/extable.c39
3 files changed, 143 insertions, 59 deletions
diff --git a/arch/s390/include/asm/asm-extable.h b/arch/s390/include/asm/asm-extable.h
index f24d9591aaed..b74f1070ddb2 100644
--- a/arch/s390/include/asm/asm-extable.h
+++ b/arch/s390/include/asm/asm-extable.h
@@ -3,12 +3,24 @@
#define __ASM_EXTABLE_H
#include <linux/stringify.h>
+#include <linux/bits.h>
#include <asm/asm-const.h>
-#define EX_TYPE_NONE 0
-#define EX_TYPE_FIXUP 1
-#define EX_TYPE_BPF 2
-#define EX_TYPE_UACCESS 3
+#define EX_TYPE_NONE 0
+#define EX_TYPE_FIXUP 1
+#define EX_TYPE_BPF 2
+#define EX_TYPE_UA_STORE 3
+#define EX_TYPE_UA_LOAD_MEM 4
+#define EX_TYPE_UA_LOAD_REG 5
+
+#define EX_DATA_REG_ERR_SHIFT 0
+#define EX_DATA_REG_ERR GENMASK(3, 0)
+
+#define EX_DATA_REG_ADDR_SHIFT 4
+#define EX_DATA_REG_ADDR GENMASK(7, 4)
+
+#define EX_DATA_LEN_SHIFT 8
+#define EX_DATA_LEN GENMASK(11, 8)
#define __EX_TABLE(_section, _fault, _target, _type) \
stringify_in_c(.section _section,"a";) \
@@ -19,35 +31,58 @@
stringify_in_c(.short 0;) \
stringify_in_c(.previous)
-#define __EX_TABLE_UA(_section, _fault, _target, _type, _reg) \
- stringify_in_c(.section _section,"a";) \
- stringify_in_c(.align 4;) \
- stringify_in_c(.long (_fault) - .;) \
- stringify_in_c(.long (_target) - .;) \
- stringify_in_c(.short (_type);) \
- stringify_in_c(.macro extable_reg reg;) \
- stringify_in_c(.set .Lfound, 0;) \
- stringify_in_c(.set .Lregnr, 0;) \
- stringify_in_c(.irp rs,r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,r13,r14,r15;) \
- stringify_in_c(.ifc "\reg", "%%\rs";) \
- stringify_in_c(.set .Lfound, 1;) \
- stringify_in_c(.short .Lregnr;) \
- stringify_in_c(.endif;) \
- stringify_in_c(.set .Lregnr, .Lregnr+1;) \
- stringify_in_c(.endr;) \
- stringify_in_c(.ifne (.Lfound != 1);) \
- stringify_in_c(.error "extable_reg: bad register argument";) \
- stringify_in_c(.endif;) \
- stringify_in_c(.endm;) \
- stringify_in_c(extable_reg _reg;) \
- stringify_in_c(.purgem extable_reg;) \
+#define __EX_TABLE_UA(_section, _fault, _target, _type, _regerr, _regaddr, _len)\
+ stringify_in_c(.section _section,"a";) \
+ stringify_in_c(.align 4;) \
+ stringify_in_c(.long (_fault) - .;) \
+ stringify_in_c(.long (_target) - .;) \
+ stringify_in_c(.short (_type);) \
+ stringify_in_c(.macro extable_reg regerr, regaddr;) \
+ stringify_in_c(.set .Lfound, 0;) \
+ stringify_in_c(.set .Lcurr, 0;) \
+ stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \
+ stringify_in_c( .ifc "\regerr", "%%r\rs";) \
+ stringify_in_c( .set .Lfound, 1;) \
+ stringify_in_c( .set .Lregerr, .Lcurr;) \
+ stringify_in_c( .endif;) \
+ stringify_in_c( .set .Lcurr, .Lcurr+1;) \
+ stringify_in_c(.endr;) \
+ stringify_in_c(.ifne (.Lfound != 1);) \
+ stringify_in_c( .error "extable_reg: bad register argument1";) \
+ stringify_in_c(.endif;) \
+ stringify_in_c(.set .Lfound, 0;) \
+ stringify_in_c(.set .Lcurr, 0;) \
+ stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \
+ stringify_in_c( .ifc "\regaddr", "%%r\rs";) \
+ stringify_in_c( .set .Lfound, 1;) \
+ stringify_in_c( .set .Lregaddr, .Lcurr;) \
+ stringify_in_c( .endif;) \
+ stringify_in_c( .set .Lcurr, .Lcurr+1;) \
+ stringify_in_c(.endr;) \
+ stringify_in_c(.ifne (.Lfound != 1);) \
+ stringify_in_c( .error "extable_reg: bad register argument2";) \
+ stringify_in_c(.endif;) \
+ stringify_in_c(.short .Lregerr << EX_DATA_REG_ERR_SHIFT | \
+ .Lregaddr << EX_DATA_REG_ADDR_SHIFT | \
+ _len << EX_DATA_LEN_SHIFT;) \
+ stringify_in_c(.endm;) \
+ stringify_in_c(extable_reg _regerr,_regaddr;) \
+ stringify_in_c(.purgem extable_reg;) \
stringify_in_c(.previous)
#define EX_TABLE(_fault, _target) \
__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FIXUP)
+
#define EX_TABLE_AMODE31(_fault, _target) \
__EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP)
-#define EX_TABLE_UA(_fault, _target, _reg) \
- __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UACCESS, _reg)
+
+#define EX_TABLE_UA_STORE(_fault, _target, _regerr) \
+ __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_STORE, _regerr, _regerr, 0)
+
+#define EX_TABLE_UA_LOAD_MEM(_fault, _target, _regerr, _regmem, _len) \
+ __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_MEM, _regerr, _regmem, _len)
+
+#define EX_TABLE_UA_LOAD_REG(_fault, _target, _regerr, _regzero) \
+ __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0)
#endif /* __ASM_EXTABLE_H */
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index 5ffb88b3fdee..2d8d9e89d48f 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -80,8 +80,12 @@ union oac {
};
};
-#define __put_get_user_asm(to, from, size, oac_spec) \
+#define __put_user_asm(to, from, size) \
({ \
+ union oac __oac_spec = { \
+ .oac1.as = PSW_BITS_AS_SECONDARY, \
+ .oac1.a = 1, \
+ }; \
int __rc; \
\
asm volatile( \
@@ -89,26 +93,15 @@ union oac {
"0: mvcos %[_to],%[_from],%[_size]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
- EX_TABLE_UA(0b,2b,%[rc]) EX_TABLE_UA(1b,2b,%[rc]) \
+ EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
+ EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
: [rc] "=&d" (__rc), [_to] "+Q" (*(to)) \
: [_size] "d" (size), [_from] "Q" (*(from)), \
- [spec] "d" (oac_spec.val) \
+ [spec] "d" (__oac_spec.val) \
: "cc", "0"); \
__rc; \
})
-#define __put_user_asm(to, from, size) \
- __put_get_user_asm(to, from, size, ((union oac) { \
- .oac1.as = PSW_BITS_AS_SECONDARY, \
- .oac1.a = 1 \
- }))
-
-#define __get_user_asm(to, from, size) \
- __put_get_user_asm(to, from, size, ((union oac) { \
- .oac2.as = PSW_BITS_AS_SECONDARY, \
- .oac2.a = 1 \
- })) \
-
static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
int rc;
@@ -141,6 +134,29 @@ static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned lon
return rc;
}
+#define __get_user_asm(to, from, size) \
+({ \
+ union oac __oac_spec = { \
+ .oac2.as = PSW_BITS_AS_SECONDARY, \
+ .oac2.a = 1, \
+ }; \
+ int __rc; \
+ \
+ asm volatile( \
+ " lr 0,%[spec]\n" \
+ "0: mvcos 0(%[_to]),%[_from],%[_size]\n" \
+ "1: xr %[rc],%[rc]\n" \
+ "2:\n" \
+ EX_TABLE_UA_LOAD_MEM(0b, 2b, %[rc], %[_to], %[_ksize]) \
+ EX_TABLE_UA_LOAD_MEM(1b, 2b, %[rc], %[_to], %[_ksize]) \
+ : [rc] "=&d" (__rc), "=Q" (*(to)) \
+ : [_size] "d" (size), [_from] "Q" (*(from)), \
+ [spec] "d" (__oac_spec.val), [_to] "a" (to), \
+ [_ksize] "K" (size) \
+ : "cc", "0"); \
+ __rc; \
+})
+
static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
int rc;
@@ -210,28 +226,28 @@ static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsign
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: { \
- unsigned char __x = 0; \
+ unsigned char __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 2: { \
- unsigned short __x = 0; \
+ unsigned short __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 4: { \
- unsigned int __x = 0; \
+ unsigned int __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 8: { \
- unsigned long long __x = 0; \
+ unsigned long __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
@@ -281,7 +297,8 @@ int __noreturn __put_kernel_bad(void);
"0: " insn " %[_val],%[_to]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
- EX_TABLE_UA(0b,2b,%0) EX_TABLE_UA(1b,2b,%0) \
+ EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
+ EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
: [rc] "=d" (__rc), [_to] "+Q" (*(to)) \
: [_val] "d" (val) \
: "cc"); \
@@ -290,7 +307,7 @@ int __noreturn __put_kernel_bad(void);
#define __put_kernel_nofault(dst, src, type, err_label) \
do { \
- u64 __x = (u64)(*((type *)(src))); \
+ unsigned long __x = (unsigned long)(*((type *)(src))); \
int __pk_err; \
\
switch (sizeof(type)) { \
@@ -324,8 +341,9 @@ int __noreturn __get_kernel_bad(void);
"0: " insn " %[_val],%[_from]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
- EX_TABLE_UA(0b,2b,%0) EX_TABLE_UA(1b,2b,%0) \
- : [rc] "=d" (__rc), [_val] "+d" (val) \
+ EX_TABLE_UA_LOAD_REG(0b, 2b, %[rc], %[_val]) \
+ EX_TABLE_UA_LOAD_REG(1b, 2b, %[rc], %[_val]) \
+ : [rc] "=d" (__rc), [_val] "=d" (val) \
: [_from] "Q" (*(from)) \
: "cc"); \
__rc; \
@@ -337,28 +355,28 @@ do { \
\
switch (sizeof(type)) { \
case 1: { \
- u8 __x = 0; \
+ unsigned char __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "ic"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
case 2: { \
- u16 __x = 0; \
+ unsigned short __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "lh"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
case 4: { \
- u32 __x = 0; \
+ unsigned int __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "l"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
case 8: { \
- u64 __x = 0; \
+ unsigned long __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "lg"); \
*((type *)(dst)) = (type)__x; \
diff --git a/arch/s390/mm/extable.c b/arch/s390/mm/extable.c
index 8ac8ad2474a0..1e4d2187541a 100644
--- a/arch/s390/mm/extable.c
+++ b/arch/s390/mm/extable.c
@@ -1,6 +1,8 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/bitfield.h>
#include <linux/extable.h>
+#include <linux/string.h>
#include <linux/errno.h>
#include <linux/panic.h>
#include <asm/asm-extable.h>
@@ -24,9 +26,34 @@ static bool ex_handler_fixup(const struct exception_table_entry *ex, struct pt_r
return true;
}
-static bool ex_handler_uaccess(const struct exception_table_entry *ex, struct pt_regs *regs)
+static bool ex_handler_ua_store(const struct exception_table_entry *ex, struct pt_regs *regs)
{
- regs->gprs[ex->data] = -EFAULT;
+ unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
+
+ regs->gprs[reg_err] = -EFAULT;
+ regs->psw.addr = extable_fixup(ex);
+ return true;
+}
+
+static bool ex_handler_ua_load_mem(const struct exception_table_entry *ex, struct pt_regs *regs)
+{
+ unsigned int reg_addr = FIELD_GET(EX_DATA_REG_ADDR, ex->data);
+ unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
+ size_t len = FIELD_GET(EX_DATA_LEN, ex->data);
+
+ regs->gprs[reg_err] = -EFAULT;
+ memset((void *)regs->gprs[reg_addr], 0, len);
+ regs->psw.addr = extable_fixup(ex);
+ return true;
+}
+
+static bool ex_handler_ua_load_reg(const struct exception_table_entry *ex, struct pt_regs *regs)
+{
+ unsigned int reg_zero = FIELD_GET(EX_DATA_REG_ADDR, ex->data);
+ unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
+
+ regs->gprs[reg_err] = -EFAULT;
+ regs->gprs[reg_zero] = 0;
regs->psw.addr = extable_fixup(ex);
return true;
}
@@ -43,8 +70,12 @@ bool fixup_exception(struct pt_regs *regs)
return ex_handler_fixup(ex, regs);
case EX_TYPE_BPF:
return ex_handler_bpf(ex, regs);
- case EX_TYPE_UACCESS:
- return ex_handler_uaccess(ex, regs);
+ case EX_TYPE_UA_STORE:
+ return ex_handler_ua_store(ex, regs);
+ case EX_TYPE_UA_LOAD_MEM:
+ return ex_handler_ua_load_mem(ex, regs);
+ case EX_TYPE_UA_LOAD_REG:
+ return ex_handler_ua_load_reg(ex, regs);
}
panic("invalid exception table entry");
}
generated by cgit (git 2.34.1) at 2024-07-02 22:29:55 +0000