| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Heiko Carstens | 529 | 42.42% | 12 | 60.00% |
| Martin Schwidefsky | 447 | 35.85% | 4 | 20.00% |
| Gerald Schaefer | 260 | 20.85% | 2 | 10.00% |
| Al Viro | 10 | 0.80% | 1 | 5.00% |
| Greg Kroah-Hartman | 1 | 0.08% | 1 | 5.00% |
| Total | 1247 | 20 |
// SPDX-License-Identifier: GPL-2.0 /* * Standard user space access functions based on mvcp/mvcs and doing * interesting things in the secondary space mode. * * Copyright IBM Corp. 2006,2014 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Gerald Schaefer (gerald.schaefer@de.ibm.com) */ #include <linux/jump_label.h> #include <linux/uaccess.h> #include <linux/export.h> #include <linux/errno.h> #include <linux/mm.h> #include <asm/mmu_context.h> #include <asm/facility.h> #ifndef CONFIG_HAVE_MARCH_Z10_FEATURES static DEFINE_STATIC_KEY_FALSE(have_mvcos); static int __init uaccess_init(void) { if (test_facility(27)) static_branch_enable(&have_mvcos); return 0; } early_initcall(uaccess_init); static inline int copy_with_mvcos(void) { if (static_branch_likely(&have_mvcos)) return 1; return 0; } #else static inline int copy_with_mvcos(void) { return 1; } #endif void set_fs(mm_segment_t fs) { current->thread.mm_segment = fs; if (fs == USER_DS) { __ctl_load(S390_lowcore.user_asce, 1, 1); clear_cpu_flag(CIF_ASCE_PRIMARY); } else { __ctl_load(S390_lowcore.kernel_asce, 1, 1); set_cpu_flag(CIF_ASCE_PRIMARY); } if (fs & 1) { if (fs == USER_DS_SACF) __ctl_load(S390_lowcore.user_asce, 7, 7); else __ctl_load(S390_lowcore.kernel_asce, 7, 7); set_cpu_flag(CIF_ASCE_SECONDARY); } } EXPORT_SYMBOL(set_fs); mm_segment_t enable_sacf_uaccess(void) { mm_segment_t old_fs; unsigned long asce, cr; old_fs = current->thread.mm_segment; if (old_fs & 1) return old_fs; current->thread.mm_segment |= 1; asce = S390_lowcore.kernel_asce; if (likely(old_fs == USER_DS)) { __ctl_store(cr, 1, 1); if (cr != S390_lowcore.kernel_asce) { __ctl_load(S390_lowcore.kernel_asce, 1, 1); set_cpu_flag(CIF_ASCE_PRIMARY); } asce = S390_lowcore.user_asce; } __ctl_store(cr, 7, 7); if (cr != asce) { __ctl_load(asce, 7, 7); set_cpu_flag(CIF_ASCE_SECONDARY); } return old_fs; } EXPORT_SYMBOL(enable_sacf_uaccess); void disable_sacf_uaccess(mm_segment_t old_fs) { current->thread.mm_segment = old_fs; if (old_fs == USER_DS && test_facility(27)) { __ctl_load(S390_lowcore.user_asce, 1, 1); clear_cpu_flag(CIF_ASCE_PRIMARY); } } EXPORT_SYMBOL(disable_sacf_uaccess); static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr, unsigned long size) { register unsigned long reg0 asm("0") = 0x01UL; unsigned long tmp1, tmp2; tmp1 = -4096UL; asm volatile( "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n" "6: jz 4f\n" "1: algr %0,%3\n" " slgr %1,%3\n" " slgr %2,%3\n" " j 0b\n" "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ " slgr %4,%1\n" " clgr %0,%4\n" /* copy crosses next page boundary? */ " jnh 5f\n" "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n" "7: slgr %0,%4\n" " j 5f\n" "4: slgr %0,%0\n" "5:\n" EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b) : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) : "d" (reg0) : "cc", "memory"); return size; } static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr, unsigned long size) { unsigned long tmp1, tmp2; mm_segment_t old_fs; old_fs = enable_sacf_uaccess(); tmp1 = -256UL; asm volatile( " sacf 0\n" "0: mvcp 0(%0,%2),0(%1),%3\n" "7: jz 5f\n" "1: algr %0,%3\n" " la %1,256(%1)\n" " la %2,256(%2)\n" "2: mvcp 0(%0,%2),0(%1),%3\n" "8: jnz 1b\n" " j 5f\n" "3: la %4,255(%1)\n" /* %4 = ptr + 255 */ " lghi %3,-4096\n" " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */ " slgr %4,%1\n" " clgr %0,%4\n" /* copy crosses next page boundary? */ " jnh 6f\n" "4: mvcp 0(%4,%2),0(%1),%3\n" "9: slgr %0,%4\n" " j 6f\n" "5: slgr %0,%0\n" "6: sacf 768\n" EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b) EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b) : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) : : "cc", "memory"); disable_sacf_uaccess(old_fs); return size; } unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) { if (copy_with_mvcos()) return copy_from_user_mvcos(to, from, n); return copy_from_user_mvcp(to, from, n); } EXPORT_SYMBOL(raw_copy_from_user); static inline unsigned long copy_to_user_mvcos(void __user *ptr, const void *x, unsigned long size) { register unsigned long reg0 asm("0") = 0x010000UL; unsigned long tmp1, tmp2; tmp1 = -4096UL; asm volatile( "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" "6: jz 4f\n" "1: algr %0,%3\n" " slgr %1,%3\n" " slgr %2,%3\n" " j 0b\n" "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ " slgr %4,%1\n" " clgr %0,%4\n" /* copy crosses next page boundary? */ " jnh 5f\n" "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n" "7: slgr %0,%4\n" " j 5f\n" "4: slgr %0,%0\n" "5:\n" EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b) : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) : "d" (reg0) : "cc", "memory"); return size; } static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x, unsigned long size) { unsigned long tmp1, tmp2; mm_segment_t old_fs; old_fs = enable_sacf_uaccess(); tmp1 = -256UL; asm volatile( " sacf 0\n" "0: mvcs 0(%0,%1),0(%2),%3\n" "7: jz 5f\n" "1: algr %0,%3\n" " la %1,256(%1)\n" " la %2,256(%2)\n" "2: mvcs 0(%0,%1),0(%2),%3\n" "8: jnz 1b\n" " j 5f\n" "3: la %4,255(%1)\n" /* %4 = ptr + 255 */ " lghi %3,-4096\n" " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */ " slgr %4,%1\n" " clgr %0,%4\n" /* copy crosses next page boundary? */ " jnh 6f\n" "4: mvcs 0(%4,%1),0(%2),%3\n" "9: slgr %0,%4\n" " j 6f\n" "5: slgr %0,%0\n" "6: sacf 768\n" EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b) EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b) : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) : : "cc", "memory"); disable_sacf_uaccess(old_fs); return size; } unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) { if (copy_with_mvcos()) return copy_to_user_mvcos(to, from, n); return copy_to_user_mvcs(to, from, n); } EXPORT_SYMBOL(raw_copy_to_user); static inline unsigned long copy_in_user_mvcos(void __user *to, const void __user *from, unsigned long size) { register unsigned long reg0 asm("0") = 0x010001UL; unsigned long tmp1, tmp2; tmp1 = -4096UL; /* FIXME: copy with reduced length. */ asm volatile( "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" " jz 2f\n" "1: algr %0,%3\n" " slgr %1,%3\n" " slgr %2,%3\n" " j 0b\n" "2:slgr %0,%0\n" "3: \n" EX_TABLE(0b,3b) : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2) : "d" (reg0) : "cc", "memory"); return size; } static inline unsigned long copy_in_user_mvc(void __user *to, const void __user *from, unsigned long size) { mm_segment_t old_fs; unsigned long tmp1; old_fs = enable_sacf_uaccess(); asm volatile( " sacf 256\n" " aghi %0,-1\n" " jo 5f\n" " bras %3,3f\n" "0: aghi %0,257\n" "1: mvc 0(1,%1),0(%2)\n" " la %1,1(%1)\n" " la %2,1(%2)\n" " aghi %0,-1\n" " jnz 1b\n" " j 5f\n" "2: mvc 0(256,%1),0(%2)\n" " la %1,256(%1)\n" " la %2,256(%2)\n" "3: aghi %0,-256\n" " jnm 2b\n" "4: ex %0,1b-0b(%3)\n" "5: slgr %0,%0\n" "6: sacf 768\n" EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b) : "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1) : : "cc", "memory"); disable_sacf_uaccess(old_fs); return size; } unsigned long raw_copy_in_user(void __user *to, const void __user *from, unsigned long n) { if (copy_with_mvcos()) return copy_in_user_mvcos(to, from, n); return copy_in_user_mvc(to, from, n); } EXPORT_SYMBOL(raw_copy_in_user); static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size) { register unsigned long reg0 asm("0") = 0x010000UL; unsigned long tmp1, tmp2; tmp1 = -4096UL; asm volatile( "0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n" " jz 4f\n" "1: algr %0,%2\n" " slgr %1,%2\n" " j 0b\n" "2: la %3,4095(%1)\n"/* %4 = to + 4095 */ " nr %3,%2\n" /* %4 = (to + 4095) & -4096 */ " slgr %3,%1\n" " clgr %0,%3\n" /* copy crosses next page boundary? */ " jnh 5f\n" "3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n" " slgr %0,%3\n" " j 5f\n" "4: slgr %0,%0\n" "5:\n" EX_TABLE(0b,2b) EX_TABLE(3b,5b) : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2) : "a" (empty_zero_page), "d" (reg0) : "cc", "memory"); return size; } static inline unsigned long clear_user_xc(void __user *to, unsigned long size) { mm_segment_t old_fs; unsigned long tmp1, tmp2; old_fs = enable_sacf_uaccess(); asm volatile( " sacf 256\n" " aghi %0,-1\n" " jo 5f\n" " bras %3,3f\n" " xc 0(1,%1),0(%1)\n" "0: aghi %0,257\n" " la %2,255(%1)\n" /* %2 = ptr + 255 */ " srl %2,12\n" " sll %2,12\n" /* %2 = (ptr + 255) & -4096 */ " slgr %2,%1\n" " clgr %0,%2\n" /* clear crosses next page boundary? */ " jnh 5f\n" " aghi %2,-1\n" "1: ex %2,0(%3)\n" " aghi %2,1\n" " slgr %0,%2\n" " j 5f\n" "2: xc 0(256,%1),0(%1)\n" " la %1,256(%1)\n" "3: aghi %0,-256\n" " jnm 2b\n" "4: ex %0,0(%3)\n" "5: slgr %0,%0\n" "6: sacf 768\n" EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b) : "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2) : : "cc", "memory"); disable_sacf_uaccess(old_fs); return size; } unsigned long __clear_user(void __user *to, unsigned long size) { if (copy_with_mvcos()) return clear_user_mvcos(to, size); return clear_user_xc(to, size); } EXPORT_SYMBOL(__clear_user); static inline unsigned long strnlen_user_srst(const char __user *src, unsigned long size) { register unsigned long reg0 asm("0") = 0; unsigned long tmp1, tmp2; asm volatile( " la %2,0(%1)\n" " la %3,0(%0,%1)\n" " slgr %0,%0\n" " sacf 256\n" "0: srst %3,%2\n" " jo 0b\n" " la %0,1(%3)\n" /* strnlen_user results includes \0 */ " slgr %0,%1\n" "1: sacf 768\n" EX_TABLE(0b,1b) : "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2) : "d" (reg0) : "cc", "memory"); return size; } unsigned long __strnlen_user(const char __user *src, unsigned long size) { mm_segment_t old_fs; unsigned long len; if (unlikely(!size)) return 0; old_fs = enable_sacf_uaccess(); len = strnlen_user_srst(src, size); disable_sacf_uaccess(old_fs); return len; } EXPORT_SYMBOL(__strnlen_user); long __strncpy_from_user(char *dst, const char __user *src, long size) { size_t done, len, offset, len_str; if (unlikely(size <= 0)) return 0; done = 0; do { offset = (size_t)src & (L1_CACHE_BYTES - 1); len = min(size - done, L1_CACHE_BYTES - offset); if (copy_from_user(dst, src, len)) return -EFAULT; len_str = strnlen(dst, len); done += len_str; src += len_str; dst += len_str; } while ((len_str == len) && (done < size)); return done; } EXPORT_SYMBOL(__strncpy_from_user);
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