[PATCH REPOST 1/5] ARM: kvm: replace push and pop with stdmb and ldmia instrs to enable assembler.h inclusion
Christoffer Dall
christoffer.dall at linaro.org
Mon Jan 20 20:18:25 EST 2014
On Fri, Dec 20, 2013 at 08:48:41AM -0800, Victor Kamensky wrote:
> Before fix kvm interrupt.S and interrupt_head.S used push and pop assembler
> instruction. It causes problem if <asm/assembler.h> file should be include. In
> assembler.h "push" is defined as macro so it causes compilation errors like
> this:
"Before fix kvm..." doesn't read very pleasently, consider using
something like "Prior to this commit...."
"causes a problem" or "causes problems"
change "if <asm/assembler.h> file should be include..." to "if
<asm/assembler.h> is included, because assember.h defines 'push' as a
macro..."
>
> arch/arm/kvm/interrupts.S: Assembler messages:
> arch/arm/kvm/interrupts.S:51: Error: ARM register expected -- `lsr {r2,r3}'
>
> Solution implemented by this patch replaces all 'push {...}' with
> 'stdmb sp!, {...}' instruction; and all 'pop {...}' with 'ldmia sp!, {...}'.
>
> Signed-off-by: Victor Kamensky <victor.kamensky at linaro.org>
> ---
> arch/arm/kvm/interrupts.S | 38 +++++++++++++++++++-------------------
> arch/arm/kvm/interrupts_head.S | 34 +++++++++++++++++-----------------
> 2 files changed, 36 insertions(+), 36 deletions(-)
>
> diff --git a/arch/arm/kvm/interrupts.S b/arch/arm/kvm/interrupts.S
> index ddc1553..df19133 100644
> --- a/arch/arm/kvm/interrupts.S
> +++ b/arch/arm/kvm/interrupts.S
> @@ -47,7 +47,7 @@ __kvm_hyp_code_start:
> * instead, ignoring the ipa value.
> */
> ENTRY(__kvm_tlb_flush_vmid_ipa)
> - push {r2, r3}
> + stmdb sp!, {r2, r3}
>
> dsb ishst
> add r0, r0, #KVM_VTTBR
> @@ -62,7 +62,7 @@ ENTRY(__kvm_tlb_flush_vmid_ipa)
> mcrr p15, 6, r2, r3, c2 @ Back to VMID #0
> isb @ Not necessary if followed by eret
>
> - pop {r2, r3}
> + ldmia sp!, {r2, r3}
> bx lr
> ENDPROC(__kvm_tlb_flush_vmid_ipa)
>
> @@ -110,7 +110,7 @@ ENTRY(__kvm_vcpu_run)
> #ifdef CONFIG_VFPv3
> @ Set FPEXC_EN so the guest doesn't trap floating point instructions
> VFPFMRX r2, FPEXC @ VMRS
> - push {r2}
> + stmdb sp!, {r2}
> orr r2, r2, #FPEXC_EN
> VFPFMXR FPEXC, r2 @ VMSR
> #endif
> @@ -175,7 +175,7 @@ __kvm_vcpu_return:
>
> after_vfp_restore:
> @ Restore FPEXC_EN which we clobbered on entry
> - pop {r2}
> + ldmia sp!, {r2}
> VFPFMXR FPEXC, r2
> #endif
>
> @@ -260,7 +260,7 @@ ENTRY(kvm_call_hyp)
>
> /* Handle undef, svc, pabt, or dabt by crashing with a user notice */
> .macro bad_exception exception_code, panic_str
> - push {r0-r2}
> + stmdb sp!, {r0-r2}
> mrrc p15, 6, r0, r1, c2 @ Read VTTBR
> lsr r1, r1, #16
> ands r1, r1, #0xff
> @@ -338,7 +338,7 @@ hyp_hvc:
> * Getting here is either becuase of a trap from a guest or from calling
> * HVC from the host kernel, which means "switch to Hyp mode".
> */
> - push {r0, r1, r2}
> + stmdb sp!, {r0, r1, r2}
>
> @ Check syndrome register
> mrc p15, 4, r1, c5, c2, 0 @ HSR
> @@ -361,11 +361,11 @@ hyp_hvc:
> bne guest_trap @ Guest called HVC
>
> host_switch_to_hyp:
> - pop {r0, r1, r2}
> + ldmia sp!, {r0, r1, r2}
>
> - push {lr}
> + stmdb sp!, {lr}
> mrs lr, SPSR
> - push {lr}
> + stmdb sp!, {lr}
>
> mov lr, r0
> mov r0, r1
> @@ -375,9 +375,9 @@ host_switch_to_hyp:
> THUMB( orr lr, #1)
> blx lr @ Call the HYP function
>
> - pop {lr}
> + ldmia sp!, {lr}
> msr SPSR_csxf, lr
> - pop {lr}
> + ldmia sp!, {lr}
> eret
>
> guest_trap:
> @@ -418,7 +418,7 @@ guest_trap:
>
> /* Preserve PAR */
> mrrc p15, 0, r0, r1, c7 @ PAR
> - push {r0, r1}
> + stmdb sp!, {r0, r1}
>
> /* Resolve IPA using the xFAR */
> mcr p15, 0, r2, c7, c8, 0 @ ATS1CPR
> @@ -431,7 +431,7 @@ guest_trap:
> orr r2, r2, r1, lsl #24
>
> /* Restore PAR */
> - pop {r0, r1}
> + ldmia sp!, {r0, r1}
> mcrr p15, 0, r0, r1, c7 @ PAR
>
> 3: load_vcpu @ Load VCPU pointer to r0
> @@ -440,10 +440,10 @@ guest_trap:
> 1: mov r1, #ARM_EXCEPTION_HVC
> b __kvm_vcpu_return
>
> -4: pop {r0, r1} @ Failed translation, return to guest
> +4: ldmia sp!, {r0, r1} @ Failed translation, return to guest
> mcrr p15, 0, r0, r1, c7 @ PAR
> clrex
> - pop {r0, r1, r2}
> + ldmia sp!, {r0, r1, r2}
> eret
>
> /*
> @@ -455,7 +455,7 @@ guest_trap:
> #ifdef CONFIG_VFPv3
> switch_to_guest_vfp:
> load_vcpu @ Load VCPU pointer to r0
> - push {r3-r7}
> + stmdb sp!, {r3-r7}
>
> @ NEON/VFP used. Turn on VFP access.
> set_hcptr vmexit, (HCPTR_TCP(10) | HCPTR_TCP(11))
> @@ -467,15 +467,15 @@ switch_to_guest_vfp:
> add r7, r0, #VCPU_VFP_GUEST
> restore_vfp_state r7
>
> - pop {r3-r7}
> - pop {r0-r2}
> + ldmia sp!, {r3-r7}
> + ldmia sp!, {r0-r2}
> clrex
> eret
> #endif
>
> .align
> hyp_irq:
> - push {r0, r1, r2}
> + stmdb sp!, {r0, r1, r2}
> mov r1, #ARM_EXCEPTION_IRQ
> load_vcpu @ Load VCPU pointer to r0
> b __kvm_vcpu_return
> diff --git a/arch/arm/kvm/interrupts_head.S b/arch/arm/kvm/interrupts_head.S
> index 6f18695..c371db7 100644
> --- a/arch/arm/kvm/interrupts_head.S
> +++ b/arch/arm/kvm/interrupts_head.S
> @@ -63,7 +63,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> mrs r2, SP_\mode
> mrs r3, LR_\mode
> mrs r4, SPSR_\mode
> - push {r2, r3, r4}
> + stmdb sp!, {r2, r3, r4}
> .endm
>
> /*
> @@ -73,13 +73,13 @@ vcpu .req r0 @ vcpu pointer always in r0
> .macro save_host_regs
> /* Hyp regs. Only ELR_hyp (SPSR_hyp already saved) */
> mrs r2, ELR_hyp
> - push {r2}
> + stmdb sp!, {r2}
>
> /* usr regs */
> - push {r4-r12} @ r0-r3 are always clobbered
> + stmdb sp!, {r4-r12} @ r0-r3 are always clobbered
> mrs r2, SP_usr
> mov r3, lr
> - push {r2, r3}
> + stmdb sp!, {r2, r3}
>
> push_host_regs_mode svc
> push_host_regs_mode abt
> @@ -95,11 +95,11 @@ vcpu .req r0 @ vcpu pointer always in r0
> mrs r7, SP_fiq
> mrs r8, LR_fiq
> mrs r9, SPSR_fiq
> - push {r2-r9}
> + stmdb sp!, {r2-r9}
> .endm
>
> .macro pop_host_regs_mode mode
> - pop {r2, r3, r4}
> + ldmia sp!, {r2, r3, r4}
> msr SP_\mode, r2
> msr LR_\mode, r3
> msr SPSR_\mode, r4
> @@ -110,7 +110,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> * Clobbers all registers, in all modes, except r0 and r1.
> */
> .macro restore_host_regs
> - pop {r2-r9}
> + ldmia sp!, {r2-r9}
> msr r8_fiq, r2
> msr r9_fiq, r3
> msr r10_fiq, r4
> @@ -125,12 +125,12 @@ vcpu .req r0 @ vcpu pointer always in r0
> pop_host_regs_mode abt
> pop_host_regs_mode svc
>
> - pop {r2, r3}
> + ldmia sp!, {r2, r3}
> msr SP_usr, r2
> mov lr, r3
> - pop {r4-r12}
> + ldmia sp!, {r4-r12}
>
> - pop {r2}
> + ldmia sp!, {r2}
> msr ELR_hyp, r2
> .endm
>
> @@ -218,7 +218,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> add r2, vcpu, #VCPU_USR_REG(3)
> stm r2, {r3-r12}
> add r2, vcpu, #VCPU_USR_REG(0)
> - pop {r3, r4, r5} @ r0, r1, r2
> + ldmia sp!, {r3, r4, r5} @ r0, r1, r2
> stm r2, {r3, r4, r5}
> mrs r2, SP_usr
> mov r3, lr
> @@ -258,7 +258,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> mrc p15, 2, r12, c0, c0, 0 @ CSSELR
>
> .if \store_to_vcpu == 0
> - push {r2-r12} @ Push CP15 registers
> + stmdb sp!, {r2-r12} @ Push CP15 registers
> .else
> str r2, [vcpu, #CP15_OFFSET(c1_SCTLR)]
> str r3, [vcpu, #CP15_OFFSET(c1_CPACR)]
> @@ -286,7 +286,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> mrc p15, 0, r12, c12, c0, 0 @ VBAR
>
> .if \store_to_vcpu == 0
> - push {r2-r12} @ Push CP15 registers
> + stmdb sp!, {r2-r12} @ Push CP15 registers
> .else
> str r2, [vcpu, #CP15_OFFSET(c13_CID)]
> str r3, [vcpu, #CP15_OFFSET(c13_TID_URW)]
> @@ -305,7 +305,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> mrrc p15, 0, r4, r5, c7 @ PAR
>
> .if \store_to_vcpu == 0
> - push {r2,r4-r5}
> + stmdb sp!, {r2,r4-r5}
> .else
> str r2, [vcpu, #CP15_OFFSET(c14_CNTKCTL)]
> add r12, vcpu, #CP15_OFFSET(c7_PAR)
> @@ -322,7 +322,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> */
> .macro write_cp15_state read_from_vcpu
> .if \read_from_vcpu == 0
> - pop {r2,r4-r5}
> + ldmia sp!, {r2,r4-r5}
> .else
> ldr r2, [vcpu, #CP15_OFFSET(c14_CNTKCTL)]
> add r12, vcpu, #CP15_OFFSET(c7_PAR)
> @@ -333,7 +333,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> mcrr p15, 0, r4, r5, c7 @ PAR
>
> .if \read_from_vcpu == 0
> - pop {r2-r12}
> + ldmia sp!, {r2-r12}
> .else
> ldr r2, [vcpu, #CP15_OFFSET(c13_CID)]
> ldr r3, [vcpu, #CP15_OFFSET(c13_TID_URW)]
> @@ -361,7 +361,7 @@ vcpu .req r0 @ vcpu pointer always in r0
> mcr p15, 0, r12, c12, c0, 0 @ VBAR
>
> .if \read_from_vcpu == 0
> - pop {r2-r12}
> + ldmia sp!, {r2-r12}
> .else
> ldr r2, [vcpu, #CP15_OFFSET(c1_SCTLR)]
> ldr r3, [vcpu, #CP15_OFFSET(c1_CPACR)]
> --
> 1.8.1.4
>
If you fix to address Dave's comments, then the code change otherwise
looks good.
Thanks,
--
Christoffer
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