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openrisc: use scratch regs in atomic syscall
The function sys_or1k_atomic was using call-saved registers without restoring their value before returning. This is a faux pas: either we need to restore their values or use scratch regs; the latter is less code so that's the route this patch takes. Thanks to David Hennerström for doing most of the heavy-lifting in tracking this one down. Reported-by: Davd Hennerström <david.hennerstrom@aacmicrotec.com> Signed-off-by: Jonas Bonn <jonas@southpole.se>
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1 changed files with 4 additions and 4 deletions
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@ -1117,10 +1117,10 @@ ENTRY(sys_rt_sigreturn)
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ENTRY(sys_or1k_atomic)
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/* FIXME: This ignores r3 and always does an XCHG */
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DISABLE_INTERRUPTS(r17,r19)
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l.lwz r30,0(r4)
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l.lwz r28,0(r5)
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l.sw 0(r4),r28
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l.sw 0(r5),r30
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l.lwz r29,0(r4)
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l.lwz r27,0(r5)
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l.sw 0(r4),r27
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l.sw 0(r5),r29
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ENABLE_INTERRUPTS(r17)
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l.jr r9
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l.or r11,r0,r0
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