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riscv: Fix the bug in memory access fixup code 

A piece of fixup code is currently shared by __copy_user and
__clear_user.  It first disables the access to user-space memory
and then returns the "n" argument, which represents #(bytes not processed).
However,__copy_user's "n" is in register a2, while __clear_user's in a1,
and thus it causes errors for programs like setdomainname02 testcase in LTP.

This patch fixes this issue by separating their fixup code and returning
the right value for the kernel to handle a relative fault properly.

Signed-off-by: Alan Kao <alankao@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Cc: Zong Li <zong@andestech.com>
Cc: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Alan Kao 2018-05-08 10:59:33 +08:00 committed by Palmer Dabbelt
parent 29dcea8877
commit ebcbd75e39
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1 changed files with 9 additions and 4 deletions
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13
arch/riscv/lib/uaccess.S
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@ -84,7 +84,7 @@ ENTRY(__clear_user)
bgeu t0, t1, 2f
bltu a0, t0, 4f
1:
fixup REG_S, zero, (a0), 10f
fixup REG_S, zero, (a0), 11f
addi a0, a0, SZREG
bltu a0, t1, 1b
2:
@ -96,12 +96,12 @@ ENTRY(__clear_user)
li a0, 0
ret
4: /* Edge case: unalignment */
fixup sb, zero, (a0), 10f
fixup sb, zero, (a0), 11f
addi a0, a0, 1
bltu a0, t0, 4b
j 1b
5: /* Edge case: remainder */
fixup sb, zero, (a0), 10f
fixup sb, zero, (a0), 11f
addi a0, a0, 1
bltu a0, a3, 5b
j 3b
@ -109,9 +109,14 @@ ENDPROC(__clear_user)
.section .fixup,"ax"
.balign 4
/* Fixup code for __copy_user(10) and __clear_user(11) */
10:
/* Disable access to user memory */
csrs sstatus, t6
sub a0, a3, a0
mv a0, a2
ret
11:
csrs sstatus, t6
mv a0, a1
ret
.previous