diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2020-09-14 11:25:23 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-10-28 17:05:39 +0100 |
| commit | 91580f0dbf24c6d616091526a900213bc7aa48fe (patch) | |
| tree | a9a8205f35c85cfebeba74be4498055b53356eae | |
| parent | 172c34c9ff0144c3e1d96a9b54d6fecfe5d17c3c (diff) | |
ARM: head.S: use PC-relative insn sequence for secondary_data
Replace the open coded PC relative offset calculations with adr_l
and ldr_l invocations. This removes some open coded arithmetic
involving virtual addresses, avoids literal pools on v7+, and slightly
reduces the footprint of the code.
Note that it also removes a stale comment about the contents of r6.
Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
| -rw-r--r-- | arch/arm/kernel/head.S | 19 |
1 files changed, 4 insertions, 15 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index f5a636fee9d0..478506b2d51f 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -383,10 +383,8 @@ ENTRY(secondary_startup) /* * Use the page tables supplied from __cpu_up. */ - adr r4, __secondary_data - ldmia r4, {r5, r7, r12} @ address to jump to after - sub lr, r4, r5 @ mmu has been enabled - add r3, r7, lr + adr_l r3, secondary_data + mov_l r12, __secondary_switched ldrd r4, r5, [r3, #0] @ get secondary_data.pgdir ARM_BE8(eor r4, r4, r5) @ Swap r5 and r4 in BE: ARM_BE8(eor r5, r4, r5) @ it can be done in 3 steps @@ -401,22 +399,13 @@ ARM_BE8(eor r4, r4, r5) @ without using a temp reg. ENDPROC(secondary_startup) ENDPROC(secondary_startup_arm) - /* - * r6 = &secondary_data - */ ENTRY(__secondary_switched) - ldr sp, [r7, #12] @ get secondary_data.stack + ldr_l r7, secondary_data + 12 @ get secondary_data.stack + mov sp, r7 mov fp, #0 b secondary_start_kernel ENDPROC(__secondary_switched) - .align - - .type __secondary_data, %object -__secondary_data: - .long . - .long secondary_data - .long __secondary_switched #endif /* defined(CONFIG_SMP) */ |