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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2492218c63
Since commit f0e98c387e ("[SPARC]: Fix
link errors with gcc-4.3") the MNA trap handler does not emulate
stores to unaligned addresses correctly. MNA operation from both
kernel and user space are affected.
A typical effect of this bug is nr_frags in skbs are overwritten
during buffer copying/checksum-calculation, or maximally 6 bytes
of data in the network buffer will be overwitten with garbage.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
154 lines
2.9 KiB
ArmAsm
154 lines
2.9 KiB
ArmAsm
/* una_asm.S: Kernel unaligned trap assembler helpers.
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*
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* Copyright (C) 1996,2005,2008 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/errno.h>
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.text
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retl_efault:
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retl
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mov -EFAULT, %o0
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/* int __do_int_store(unsigned long *dst_addr, int size,
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* unsigned long *src_val)
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*
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* %o0 = dest_addr
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* %o1 = size
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* %o2 = src_val
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*
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* Return '0' on success, -EFAULT on failure.
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*/
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.globl __do_int_store
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__do_int_store:
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ld [%o2], %g1
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cmp %o1, 2
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be 2f
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cmp %o1, 4
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be 1f
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srl %g1, 24, %g2
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srl %g1, 16, %g7
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4: stb %g2, [%o0]
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srl %g1, 8, %g2
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5: stb %g7, [%o0 + 1]
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ld [%o2 + 4], %g7
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6: stb %g2, [%o0 + 2]
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srl %g7, 24, %g2
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7: stb %g1, [%o0 + 3]
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srl %g7, 16, %g1
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8: stb %g2, [%o0 + 4]
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srl %g7, 8, %g2
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9: stb %g1, [%o0 + 5]
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10: stb %g2, [%o0 + 6]
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b 0f
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11: stb %g7, [%o0 + 7]
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1: srl %g1, 16, %g7
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12: stb %g2, [%o0]
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srl %g1, 8, %g2
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13: stb %g7, [%o0 + 1]
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14: stb %g2, [%o0 + 2]
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b 0f
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15: stb %g1, [%o0 + 3]
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2: srl %g1, 8, %g2
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16: stb %g2, [%o0]
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17: stb %g1, [%o0 + 1]
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0: retl
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mov 0, %o0
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.section __ex_table,#alloc
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.word 4b, retl_efault
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.word 5b, retl_efault
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.word 6b, retl_efault
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.word 7b, retl_efault
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.word 8b, retl_efault
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.word 9b, retl_efault
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.word 10b, retl_efault
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.word 11b, retl_efault
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.word 12b, retl_efault
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.word 13b, retl_efault
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.word 14b, retl_efault
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.word 15b, retl_efault
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.word 16b, retl_efault
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.word 17b, retl_efault
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.previous
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/* int do_int_load(unsigned long *dest_reg, int size,
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* unsigned long *saddr, int is_signed)
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*
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* %o0 = dest_reg
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* %o1 = size
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* %o2 = saddr
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* %o3 = is_signed
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*
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* Return '0' on success, -EFAULT on failure.
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*/
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.globl do_int_load
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do_int_load:
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cmp %o1, 8
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be 9f
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cmp %o1, 4
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be 6f
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4: ldub [%o2], %g1
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5: ldub [%o2 + 1], %g2
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sll %g1, 8, %g1
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tst %o3
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be 3f
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or %g1, %g2, %g1
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sll %g1, 16, %g1
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sra %g1, 16, %g1
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3: b 0f
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st %g1, [%o0]
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6: ldub [%o2 + 1], %g2
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sll %g1, 24, %g1
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7: ldub [%o2 + 2], %g7
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sll %g2, 16, %g2
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8: ldub [%o2 + 3], %g3
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sll %g7, 8, %g7
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or %g3, %g2, %g3
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or %g7, %g3, %g7
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or %g1, %g7, %g1
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b 0f
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st %g1, [%o0]
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9: ldub [%o2], %g1
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10: ldub [%o2 + 1], %g2
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sll %g1, 24, %g1
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11: ldub [%o2 + 2], %g7
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sll %g2, 16, %g2
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12: ldub [%o2 + 3], %g3
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sll %g7, 8, %g7
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or %g1, %g2, %g1
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or %g7, %g3, %g7
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or %g1, %g7, %g7
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13: ldub [%o2 + 4], %g1
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st %g7, [%o0]
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14: ldub [%o2 + 5], %g2
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sll %g1, 24, %g1
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15: ldub [%o2 + 6], %g7
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sll %g2, 16, %g2
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16: ldub [%o2 + 7], %g3
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sll %g7, 8, %g7
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or %g1, %g2, %g1
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or %g7, %g3, %g7
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or %g1, %g7, %g7
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st %g7, [%o0 + 4]
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0: retl
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mov 0, %o0
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.section __ex_table,#alloc
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.word 4b, retl_efault
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.word 5b, retl_efault
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.word 6b, retl_efault
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.word 7b, retl_efault
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.word 8b, retl_efault
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.word 9b, retl_efault
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.word 10b, retl_efault
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.word 11b, retl_efault
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.word 12b, retl_efault
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.word 13b, retl_efault
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.word 14b, retl_efault
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.word 15b, retl_efault
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.word 16b, retl_efault
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.previous
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