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sparc32: Preserve clone syscall flags argument for restarts due to signals
This fixes a bug where a clone syscall that is restarted due to a
pending signal is restarted with garbage in the register %o0 that holds
the clone flags.
This keep the original %i0 of a syscall (as seen from the trap handler)
in %l6 rather than %l5. This is done because for clone (and also qfork)
%l5 is used as a temporary variable in the same register window. Before
this, that temporary value would be the value that was then incorrectly
used as the orig_i0 argument to do_notify_resume.
In order to preserve %l6, the temporary usage of %l6 in ret_sys_call is
changed to use %l5 instead and the setting %l6 to 0 or 1 was removed.
The use of that 0 or 1 value in %l6 was removed in commit
28e6103665
.
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
bda166930c
commit
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@ -1009,7 +1009,7 @@ do_syscall:
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andcc %l5, _TIF_SYSCALL_TRACE, %g0
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mov %i4, %o4
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bne linux_syscall_trace
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mov %i0, %l5
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mov %i0, %l6
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2:
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call %l7
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mov %i5, %o5
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@ -1018,16 +1018,15 @@ do_syscall:
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st %o0, [%sp + STACKFRAME_SZ + PT_I0]
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ret_sys_call:
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ld [%curptr + TI_FLAGS], %l6
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ld [%curptr + TI_FLAGS], %l5
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cmp %o0, -ERESTART_RESTARTBLOCK
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ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
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set PSR_C, %g2
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bgeu 1f
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andcc %l6, _TIF_SYSCALL_TRACE, %g0
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andcc %l5, _TIF_SYSCALL_TRACE, %g0
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/* System call success, clear Carry condition code. */
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andn %g3, %g2, %g3
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clr %l6
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st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
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bne linux_syscall_trace2
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ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
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@ -1042,7 +1041,6 @@ ret_sys_call:
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sub %g0, %o0, %o0
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or %g3, %g2, %g3
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st %o0, [%sp + STACKFRAME_SZ + PT_I0]
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mov 1, %l6
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st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
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bne linux_syscall_trace2
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ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
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@ -75,7 +75,7 @@ signal_p:
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ld [%sp + STACKFRAME_SZ + PT_PSR], %t_psr
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mov %g2, %o2
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mov %l5, %o1
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mov %l6, %o1
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call do_notify_resume
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add %sp, STACKFRAME_SZ, %o0 ! pt_regs ptr
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