From 99ed3ed08d629eb0db6866d266e2bbe35efa5f9d Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 11 Jul 2018 14:56:47 +0100 Subject: arm64: don't reload GPRs after apply_ssbd Now that all of the syscall logic works on the saved pt_regs, apply_ssbd can safely corrupt x0-x3 in the entry paths, and we no longer need to restore them. So let's remove the logic doing so. With that logic gone, we can fold the branch target into the macro, so that callers need not deal with this. GAS provides \@, which provides a unique value per macro invocation, which we can use to create a unique label. Signed-off-by: Mark Rutland Acked-by: Marc Zyngier Acked-by: Catalin Marinas Cc: Will Deacon Signed-off-by: Will Deacon --- arch/arm64/kernel/entry.S | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) (limited to 'arch/arm64/kernel/entry.S') diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index c41b84d06644..22b240da949b 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -130,20 +130,21 @@ alternative_else_nop_endif // This macro corrupts x0-x3. It is the caller's duty // to save/restore them if required. - .macro apply_ssbd, state, targ, tmp1, tmp2 + .macro apply_ssbd, state, tmp1, tmp2 #ifdef CONFIG_ARM64_SSBD alternative_cb arm64_enable_wa2_handling - b \targ + b .L__asm_ssbd_skip\@ alternative_cb_end ldr_this_cpu \tmp2, arm64_ssbd_callback_required, \tmp1 - cbz \tmp2, \targ + cbz \tmp2, .L__asm_ssbd_skip\@ ldr \tmp2, [tsk, #TSK_TI_FLAGS] - tbnz \tmp2, #TIF_SSBD, \targ + tbnz \tmp2, #TIF_SSBD, .L__asm_ssbd_skip\@ mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2 mov w1, #\state alternative_cb arm64_update_smccc_conduit nop // Patched to SMC/HVC #0 alternative_cb_end +.L__asm_ssbd_skip\@: #endif .endm @@ -173,13 +174,7 @@ alternative_cb_end ldr x19, [tsk, #TSK_TI_FLAGS] // since we can unmask debug disable_step_tsk x19, x20 // exceptions when scheduling. - apply_ssbd 1, 1f, x22, x23 - -#ifdef CONFIG_ARM64_SSBD - ldp x0, x1, [sp, #16 * 0] - ldp x2, x3, [sp, #16 * 1] -#endif -1: + apply_ssbd 1, x22, x23 mov x29, xzr // fp pointed to user-space .else @@ -321,8 +316,7 @@ alternative_if ARM64_WORKAROUND_845719 alternative_else_nop_endif #endif 3: - apply_ssbd 0, 5f, x0, x1 -5: + apply_ssbd 0, x0, x1 .endif msr elr_el1, x21 // set up the return data -- cgit v1.2.3