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| author |   Mark Rutland <mark.rutland@arm.com> | 2015-07-10 15:46:32 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2015-07-10 16:47:13 +0100 |
| commit | ad2daa85bd50b7ff5c851b80a0b813bdc8d14f8e (patch) | |
| tree | 94c42abf83792a968c72bfa6304a8c3d5442de58 /arch | |
| parent | arm64: entry: handle debug exceptions in el*_inv (diff) | |
| download | linux-dev-ad2daa85bd50b7ff5c851b80a0b813bdc8d14f8e.tar.xz linux-dev-ad2daa85bd50b7ff5c851b80a0b813bdc8d14f8e.zip | |
arm64: entry32: remove pointless register assignment
We currently set x27 in compat_sys_sigreturn_wrapper and
compat_sys_rt_sigreturn_wrapper, similarly to what we do with r8/why on
32-bit ARM, in an attempt to prevent sigreturns from being restarted.
However, on arm64 we have always used pt_regs::syscallno for syscall
restarting (for both native and compat tasks), and x27 is never
inspected again before being overwritten in kernel_exit.
This patch removes the pointless register assignments.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/entry32.S | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/arm64/kernel/entry32.S b/arch/arm64/kernel/entry32.S index bd9bfaa9269b..f332d5d1f6b4 100644 --- a/arch/arm64/kernel/entry32.S +++ b/arch/arm64/kernel/entry32.S @@ -32,13 +32,11 @@ ENTRY(compat_sys_sigreturn_wrapper) mov x0, sp - mov x27, #0 // prevent syscall restart handling (why) b compat_sys_sigreturn ENDPROC(compat_sys_sigreturn_wrapper) ENTRY(compat_sys_rt_sigreturn_wrapper) mov x0, sp - mov x27, #0 // prevent syscall restart handling (why) b compat_sys_rt_sigreturn ENDPROC(compat_sys_rt_sigreturn_wrapper) |