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authorMax Filippov <jcmvbkbc@gmail.com>2014-08-07 03:32:30 +0400
committerMax Filippov <jcmvbkbc@gmail.com>2014-08-14 11:59:33 +0400
commit9184289c979e78ce466993b53fc951633441e571 (patch)
tree461e8c512c9fc4f960005af5acf89f5135bbb82b /arch/xtensa
parent3cfc096e4c4fbc234634cf8a30d40348a25fc9ba (diff)
downloadlinux-9184289c979e78ce466993b53fc951633441e571.tar.xz
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>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/Kconfig26
-rw-r--r--arch/xtensa/kernel/entry.S28
2 files changed, 54 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 3d83c29c9232..49c6c3d94449 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -238,6 +238,32 @@ config HIGHMEM
If unsure, say Y.
+config FAST_SYSCALL_XTENSA
+ bool "Enable fast atomic syscalls"
+ default n
+ help
+ fast_syscall_xtensa is a syscall that can make atomic operations
+ on UP kernel when processor has no s32c1i support.
+
+ This syscall is deprecated. It may have issues when called with
+ invalid arguments. It is provided only for backwards compatibility.
+ Only enable it if your userspace software requires it.
+
+ If unsure, say N.
+
+config FAST_SYSCALL_SPILL_REGISTERS
+ bool "Enable spill registers syscall"
+ default n
+ help
+ fast_syscall_spill_registers is a syscall that spills all active
+ register windows of a calling userspace task onto its stack.
+
+ This syscall is deprecated. It may have issues when called with
+ invalid arguments. It is provided only for backwards compatibility.
+ Only enable it if your userspace software requires it.
+
+ If unsure, say N.
+
endmenu
config XTENSA_CALIBRATE_CCOUNT
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index a06b7efaae82..82bbfa5a05b3 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -986,6 +986,8 @@ ENDPROC(fast_syscall_unrecoverable)
* j done
*/
+#ifdef CONFIG_FAST_SYSCALL_XTENSA
+
#define TRY \
.section __ex_table, "a"; \
.word 66f, 67f; \
@@ -1049,6 +1051,18 @@ CATCH
ENDPROC(fast_syscall_xtensa)
+#else /* CONFIG_FAST_SYSCALL_XTENSA */
+
+ENTRY(fast_syscall_xtensa)
+
+ l32i a0, a2, PT_AREG0 # restore a0
+ movi a2, -ENOSYS
+ rfe
+
+ENDPROC(fast_syscall_xtensa)
+
+#endif /* CONFIG_FAST_SYSCALL_XTENSA */
+
/* fast_syscall_spill_registers.
*
@@ -1064,6 +1078,8 @@ ENDPROC(fast_syscall_xtensa)
* Note: We assume the stack pointer is EXC_TABLE_KSTK in the fixup handler.
*/
+#ifdef CONFIG_FAST_SYSCALL_SPILL_REGISTERS
+
ENTRY(fast_syscall_spill_registers)
/* Register a FIXUP handler (pass current wb as a parameter) */
@@ -1398,6 +1414,18 @@ ENTRY(fast_syscall_spill_registers_fixup_return)
ENDPROC(fast_syscall_spill_registers_fixup_return)
+#else /* CONFIG_FAST_SYSCALL_SPILL_REGISTERS */
+
+ENTRY(fast_syscall_spill_registers)
+
+ l32i a0, a2, PT_AREG0 # restore a0
+ movi a2, -ENOSYS
+ rfe
+
+ENDPROC(fast_syscall_spill_registers)
+
+#endif /* CONFIG_FAST_SYSCALL_SPILL_REGISTERS */
+
#ifdef CONFIG_MMU
/*
* We should never get here. Bail out!