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179 lines
4.5 KiB
179 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Standard user space access functions based on mvcp/mvcs and doing |
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* interesting things in the secondary space mode. |
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* |
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* Copyright IBM Corp. 2006,2014 |
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* Author(s): Martin Schwidefsky ([email protected]), |
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* Gerald Schaefer ([email protected]) |
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*/ |
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#include <linux/uaccess.h> |
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#include <linux/export.h> |
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#include <linux/mm.h> |
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#include <asm/asm-extable.h> |
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#ifdef CONFIG_DEBUG_ENTRY |
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void debug_user_asce(int exit) |
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{ |
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unsigned long cr1, cr7; |
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__ctl_store(cr1, 1, 1); |
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__ctl_store(cr7, 7, 7); |
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if (cr1 == S390_lowcore.kernel_asce && cr7 == S390_lowcore.user_asce) |
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return; |
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panic("incorrect ASCE on kernel %s\n" |
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"cr1: %016lx cr7: %016lx\n" |
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"kernel: %016llx user: %016llx\n", |
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exit ? "exit" : "entry", cr1, cr7, |
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S390_lowcore.kernel_asce, S390_lowcore.user_asce); |
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} |
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#endif /*CONFIG_DEBUG_ENTRY */ |
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static unsigned long raw_copy_from_user_key(void *to, const void __user *from, |
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unsigned long size, unsigned long key) |
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{ |
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unsigned long tmp1, tmp2; |
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union oac spec = { |
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.oac2.key = key, |
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.oac2.as = PSW_BITS_AS_SECONDARY, |
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.oac2.k = 1, |
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.oac2.a = 1, |
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}; |
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tmp1 = -4096UL; |
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asm volatile( |
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" lr 0,%[spec]\n" |
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"0: mvcos 0(%2),0(%1),%0\n" |
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"6: jz 4f\n" |
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"1: algr %0,%3\n" |
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" slgr %1,%3\n" |
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" slgr %2,%3\n" |
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" j 0b\n" |
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"2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ |
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" nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ |
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" slgr %4,%1\n" |
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" clgr %0,%4\n" /* copy crosses next page boundary? */ |
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" jnh 5f\n" |
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"3: mvcos 0(%2),0(%1),%4\n" |
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"7: slgr %0,%4\n" |
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" j 5f\n" |
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"4: slgr %0,%0\n" |
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"5:\n" |
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EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b) |
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: "+a" (size), "+a" (from), "+a" (to), "+a" (tmp1), "=a" (tmp2) |
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: [spec] "d" (spec.val) |
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: "cc", "memory", "0"); |
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return size; |
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} |
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unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) |
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{ |
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return raw_copy_from_user_key(to, from, n, 0); |
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} |
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EXPORT_SYMBOL(raw_copy_from_user); |
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unsigned long _copy_from_user_key(void *to, const void __user *from, |
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unsigned long n, unsigned long key) |
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{ |
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unsigned long res = n; |
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might_fault(); |
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if (!should_fail_usercopy()) { |
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instrument_copy_from_user(to, from, n); |
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res = raw_copy_from_user_key(to, from, n, key); |
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} |
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if (unlikely(res)) |
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memset(to + (n - res), 0, res); |
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return res; |
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} |
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EXPORT_SYMBOL(_copy_from_user_key); |
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static unsigned long raw_copy_to_user_key(void __user *to, const void *from, |
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unsigned long size, unsigned long key) |
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{ |
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unsigned long tmp1, tmp2; |
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union oac spec = { |
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.oac1.key = key, |
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.oac1.as = PSW_BITS_AS_SECONDARY, |
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.oac1.k = 1, |
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.oac1.a = 1, |
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}; |
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tmp1 = -4096UL; |
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asm volatile( |
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" lr 0,%[spec]\n" |
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"0: mvcos 0(%1),0(%2),%0\n" |
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"6: jz 4f\n" |
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"1: algr %0,%3\n" |
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" slgr %1,%3\n" |
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" slgr %2,%3\n" |
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" j 0b\n" |
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"2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ |
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" nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ |
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" slgr %4,%1\n" |
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" clgr %0,%4\n" /* copy crosses next page boundary? */ |
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" jnh 5f\n" |
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"3: mvcos 0(%1),0(%2),%4\n" |
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"7: slgr %0,%4\n" |
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" j 5f\n" |
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"4: slgr %0,%0\n" |
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"5:\n" |
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EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b) |
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: "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2) |
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: [spec] "d" (spec.val) |
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: "cc", "memory", "0"); |
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return size; |
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} |
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unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) |
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{ |
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return raw_copy_to_user_key(to, from, n, 0); |
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} |
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EXPORT_SYMBOL(raw_copy_to_user); |
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unsigned long _copy_to_user_key(void __user *to, const void *from, |
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unsigned long n, unsigned long key) |
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{ |
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might_fault(); |
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if (should_fail_usercopy()) |
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return n; |
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instrument_copy_to_user(to, from, n); |
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return raw_copy_to_user_key(to, from, n, key); |
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} |
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EXPORT_SYMBOL(_copy_to_user_key); |
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unsigned long __clear_user(void __user *to, unsigned long size) |
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{ |
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unsigned long tmp1, tmp2; |
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union oac spec = { |
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.oac1.as = PSW_BITS_AS_SECONDARY, |
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.oac1.a = 1, |
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}; |
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tmp1 = -4096UL; |
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asm volatile( |
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" lr 0,%[spec]\n" |
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"0: mvcos 0(%1),0(%4),%0\n" |
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" jz 4f\n" |
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"1: algr %0,%2\n" |
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" slgr %1,%2\n" |
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" j 0b\n" |
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"2: la %3,4095(%1)\n"/* %4 = to + 4095 */ |
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" nr %3,%2\n" /* %4 = (to + 4095) & -4096 */ |
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" slgr %3,%1\n" |
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" clgr %0,%3\n" /* copy crosses next page boundary? */ |
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" jnh 5f\n" |
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"3: mvcos 0(%1),0(%4),%3\n" |
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" slgr %0,%3\n" |
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" j 5f\n" |
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"4: slgr %0,%0\n" |
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"5:\n" |
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EX_TABLE(0b,2b) EX_TABLE(3b,5b) |
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: "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2) |
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: "a" (empty_zero_page), [spec] "d" (spec.val) |
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: "cc", "memory", "0"); |
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return size; |
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} |
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EXPORT_SYMBOL(__clear_user);
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