arm64: entry: Allow tramp_alias to access symbols after the 4K boundary

Systems using kpti enter and exit the kernel through a trampoline mapping
that is always mapped, even when the kernel is not. tramp_valias is a macro
to find the address of a symbol in the trampoline mapping.

Adding extra sets of vectors will expand the size of the entry.tramp.text
section to beyond 4K. tramp_valias will be unable to generate addresses
for symbols beyond 4K as it uses the 12 bit immediate of the add
instruction.

As there are now two registers available when tramp_alias is called,
use the extra register to avoid the 4K limit of the 12 bit immediate.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>

arch/arm64/kernel/entry.S

@@ -103,9 +103,12 @@
 .org .Lventry_start\@ + 128 // Did we overflow the ventry slot?
  .endm
 
- .macro tramp_alias, dst, sym
+ .macro tramp_alias, dst, sym, tmp
  mov_q \dst, TRAMP_VALIAS
- add \dst, \dst, #(\sym - .entry.tramp.text)
+ adr_l \tmp, \sym
+ add \dst, \dst, \tmp
+ adr_l \tmp, .entry.tramp.text
+ sub \dst, \dst, \tmp
  .endm
 
  /*
@@ -429,10 +432,10 @@ alternative_else_nop_endif
 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
  bne 4f
  msr far_el1, x29
- tramp_alias x30, tramp_exit_native
+ tramp_alias x30, tramp_exit_native, x29
  br x30
 4:
- tramp_alias x30, tramp_exit_compat
+ tramp_alias x30, tramp_exit_compat, x29
  br x30
 #endif
  .else
@@ -1000,7 +1003,7 @@ alternative_if_not ARM64_UNMAP_KERNEL_AT_EL0
 alternative_else_nop_endif
 
 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
- tramp_alias dst=x5, sym=__sdei_asm_exit_trampoline
+ tramp_alias dst=x5, sym=__sdei_asm_exit_trampoline, tmp=x3
  br x5
 #endif
 SYM_CODE_END(__sdei_asm_handler)