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arm64: entry: remove unused register aliases 

In commit:

  3b7142752e ("arm64: convert native/compat syscall entry to C")

... we moved the syscall invocation code from assembly to C, but left
behind a number of register aliases which are now unused.

Let's remove them before they confuse someone.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2019-01-03 13:23:10 +00:00 committed by Will Deacon
parent 1236cd2bad
commit 8c2c596f8f
1 changed files with 1 additions and 11 deletions
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12
arch/arm64/kernel/entry.S
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@ -392,17 +392,7 @@ alternative_insn eret, nop, ARM64_UNMAP_KERNEL_AT_EL0
mov sp, x19
.endm
/*
* These are the registers used in the syscall handler, and allow us to
* have in theory up to 7 arguments to a function - x0 to x6.
*
* x7 is reserved for the system call number in 32-bit mode.
*/
wsc_nr .req w25 // number of system calls
xsc_nr .req x25 // number of system calls (zero-extended)
wscno .req w26 // syscall number
xscno .req x26 // syscall number (zero-extended)
stbl .req x27 // syscall table pointer
/* GPRs used by entry code */
tsk .req x28 // current thread_info
/*