148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
// 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 (schwidefsky@de.ibm.com),
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* Gerald Schaefer (gerald.schaefer@de.ibm.com)
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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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#include <asm/ctlreg.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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struct lowcore *lc = get_lowcore();
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struct ctlreg cr1, cr7;
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local_ctl_store(1, &cr1);
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local_ctl_store(7, &cr7);
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if (cr1.val == lc->user_asce.val && cr7.val == lc->user_asce.val)
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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: %016lx user: %016lx\n",
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exit ? "exit" : "entry", cr1.val, cr7.val,
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lc->kernel_asce.val, lc->user_asce.val);
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}
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#endif /*CONFIG_DEBUG_ENTRY */
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union oac {
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unsigned int val;
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struct {
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struct {
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unsigned short key : 4;
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unsigned short : 4;
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unsigned short as : 2;
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unsigned short : 4;
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unsigned short k : 1;
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unsigned short a : 1;
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} oac1;
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struct {
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unsigned short key : 4;
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unsigned short : 4;
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unsigned short as : 2;
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unsigned short : 4;
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unsigned short k : 1;
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unsigned short a : 1;
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} oac2;
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};
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};
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static uaccess_kmsan_or_inline __must_check unsigned long
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raw_copy_from_user_key(void *to, const void __user *from, unsigned long size, unsigned long key)
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{
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unsigned long osize;
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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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int cc;
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while (1) {
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osize = size;
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asm_inline volatile(
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" lr %%r0,%[spec]\n"
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"0: mvcos %[to],%[from],%[size]\n"
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"1: nopr %%r7\n"
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CC_IPM(cc)
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EX_TABLE_UA_MVCOS_FROM(0b, 0b)
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EX_TABLE_UA_MVCOS_FROM(1b, 0b)
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: CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char *)to)
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: [spec] "d" (spec.val), [from] "Q" (*(const char __user *)from)
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: CC_CLOBBER_LIST("memory", "0"));
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if (CC_TRANSFORM(cc) == 0)
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return osize - size;
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size -= 4096;
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to += 4096;
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from += 4096;
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}
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}
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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_before(to, from, n);
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res = raw_copy_from_user_key(to, from, n, key);
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instrument_copy_from_user_after(to, from, n, res);
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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 uaccess_kmsan_or_inline __must_check unsigned long
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raw_copy_to_user_key(void __user *to, const void *from, unsigned long size, unsigned long key)
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{
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unsigned long osize;
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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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int cc;
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while (1) {
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osize = size;
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asm_inline volatile(
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" lr %%r0,%[spec]\n"
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"0: mvcos %[to],%[from],%[size]\n"
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"1: nopr %%r7\n"
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CC_IPM(cc)
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EX_TABLE_UA_MVCOS_TO(0b, 0b)
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EX_TABLE_UA_MVCOS_TO(1b, 0b)
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: CC_OUT(cc, cc), [size] "+d" (size), [to] "=Q" (*(char __user *)to)
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: [spec] "d" (spec.val), [from] "Q" (*(const char *)from)
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: CC_CLOBBER_LIST("memory", "0"));
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if (CC_TRANSFORM(cc) == 0)
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return osize - size;
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size -= 4096;
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to += 4096;
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from += 4096;
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}
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}
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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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