lisa/android_kernel_xiaomi_sm8350
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nios2: page fault et.al. are *not* restartable syscalls...

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commit 8535c239ac674f7ead0f2652932d35c52c4123b2 upstream.

make sure that ->orig_r2 is negative for everything except
the syscalls.

Fixes: 82ed08dd1b ("nios2: Exception handling")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2022-08-08 16:06:04 +01:00 committed by Greg Kroah-Hartman
parent 965333345f
commit 86a89da5cd
2 changed files with 3 additions and 4 deletions
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3
arch/nios2/include/asm/entry.h
View File

@ -50,7 +50,8 @@
stw r13, PT_R13(sp) stw r13, PT_R13(sp)
stw r14, PT_R14(sp) stw r14, PT_R14(sp)
stw r15, PT_R15(sp) stw r15, PT_R15(sp)
stw r2, PT_ORIG_R2(sp) movi r24, -1
stw r24, PT_ORIG_R2(sp)
stw r7, PT_ORIG_R7(sp) stw r7, PT_ORIG_R7(sp)
stw ra, PT_RA(sp) stw ra, PT_RA(sp)

4
arch/nios2/kernel/entry.S
View File

@ -185,6 +185,7 @@ ENTRY(handle_system_call)
ldw r5, PT_R5(sp) ldw r5, PT_R5(sp)
local_restart: local_restart:
stw r2, PT_ORIG_R2(sp)
/* Check that the requested system call is within limits */ /* Check that the requested system call is within limits */
movui r1, __NR_syscalls movui r1, __NR_syscalls
bgeu r2, r1, ret_invsyscall bgeu r2, r1, ret_invsyscall
@ -336,9 +337,6 @@ external_interrupt:
/* skip if no interrupt is pending */ /* skip if no interrupt is pending */
beq r12, r0, ret_from_interrupt beq r12, r0, ret_from_interrupt
movi r24, -1
stw r24, PT_ORIG_R2(sp)
/* /*
* Process an external hardware interrupt. * Process an external hardware interrupt.
*/ */