xtensa: deprecate fast_xtensa and fast_spill_registers syscalls
These syscalls are not used by userspace tools for some time now, and they have issues when called with invalid arguments. It's not worth changing signal delivery mechanism as we don't expect any new users for these syscalls. Let's keep them for backwards compatibility under #ifdef, disabled by default. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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@ -238,6 +238,32 @@ config HIGHMEM
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If unsure, say Y.
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If unsure, say Y.
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config FAST_SYSCALL_XTENSA
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bool "Enable fast atomic syscalls"
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default n
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help
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fast_syscall_xtensa is a syscall that can make atomic operations
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on UP kernel when processor has no s32c1i support.
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This syscall is deprecated. It may have issues when called with
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invalid arguments. It is provided only for backwards compatibility.
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Only enable it if your userspace software requires it.
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If unsure, say N.
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config FAST_SYSCALL_SPILL_REGISTERS
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bool "Enable spill registers syscall"
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default n
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help
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fast_syscall_spill_registers is a syscall that spills all active
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register windows of a calling userspace task onto its stack.
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This syscall is deprecated. It may have issues when called with
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invalid arguments. It is provided only for backwards compatibility.
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Only enable it if your userspace software requires it.
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If unsure, say N.
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endmenu
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endmenu
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config XTENSA_CALIBRATE_CCOUNT
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config XTENSA_CALIBRATE_CCOUNT
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@ -986,6 +986,8 @@ ENDPROC(fast_syscall_unrecoverable)
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* j done
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* j done
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*/
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*/
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#ifdef CONFIG_FAST_SYSCALL_XTENSA
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#define TRY \
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#define TRY \
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.section __ex_table, "a"; \
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.section __ex_table, "a"; \
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.word 66f, 67f; \
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.word 66f, 67f; \
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@ -1049,6 +1051,18 @@ CATCH
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ENDPROC(fast_syscall_xtensa)
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ENDPROC(fast_syscall_xtensa)
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#else /* CONFIG_FAST_SYSCALL_XTENSA */
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ENTRY(fast_syscall_xtensa)
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l32i a0, a2, PT_AREG0 # restore a0
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movi a2, -ENOSYS
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rfe
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ENDPROC(fast_syscall_xtensa)
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#endif /* CONFIG_FAST_SYSCALL_XTENSA */
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/* fast_syscall_spill_registers.
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/* fast_syscall_spill_registers.
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*
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*
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@ -1064,6 +1078,8 @@ ENDPROC(fast_syscall_xtensa)
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* Note: We assume the stack pointer is EXC_TABLE_KSTK in the fixup handler.
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* Note: We assume the stack pointer is EXC_TABLE_KSTK in the fixup handler.
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*/
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*/
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#ifdef CONFIG_FAST_SYSCALL_SPILL_REGISTERS
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ENTRY(fast_syscall_spill_registers)
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ENTRY(fast_syscall_spill_registers)
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/* Register a FIXUP handler (pass current wb as a parameter) */
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/* Register a FIXUP handler (pass current wb as a parameter) */
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@ -1398,6 +1414,18 @@ ENTRY(fast_syscall_spill_registers_fixup_return)
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ENDPROC(fast_syscall_spill_registers_fixup_return)
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ENDPROC(fast_syscall_spill_registers_fixup_return)
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#else /* CONFIG_FAST_SYSCALL_SPILL_REGISTERS */
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ENTRY(fast_syscall_spill_registers)
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l32i a0, a2, PT_AREG0 # restore a0
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movi a2, -ENOSYS
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rfe
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ENDPROC(fast_syscall_spill_registers)
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#endif /* CONFIG_FAST_SYSCALL_SPILL_REGISTERS */
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#ifdef CONFIG_MMU
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#ifdef CONFIG_MMU
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/*
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/*
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* We should never get here. Bail out!
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* We should never get here. Bail out!
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