Re: [Xen-devel] [PATCH 4/5] xen: arm: reorder registers in struct cpu_user_regs.

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 18 Dec 2012, Ian Campbell wrote:
> Primarily this is so that they are ordered in the same way as the
> mapping from arm64 x0..x31 registers to the arm32 registers, which is
> just less confusing for everyone going forward.
> 
> It also makes the implementation of select_user_regs in the next patch
> slightly simpler.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>


Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

>  xen/arch/arm/entry.S          |    4 ++--
>  xen/arch/arm/io.h             |    1 +
>  xen/arch/arm/traps.c          |    2 +-
>  xen/include/public/arch-arm.h |   11 +++++++----
>  4 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/xen/arch/arm/entry.S b/xen/arch/arm/entry.S
> index cbd1c48..3611427 100644
> --- a/xen/arch/arm/entry.S
> +++ b/xen/arch/arm/entry.S
> @@ -12,7 +12,7 @@
>          RESTORE_ONE_BANKED(SP_##mode) ; RESTORE_ONE_BANKED(LR_##mode) ; 
> RESTORE_ONE_BANKED(SPSR_##mode)
>  
>  #define SAVE_ALL                                                        \
> -        sub sp, #(UREGS_R8_fiq - UREGS_sp); /* SP, LR, SPSR, PC */      \
> +        sub sp, #(UREGS_SP_usr - UREGS_sp); /* SP, LR, SPSR, PC */      \
>          push {r0-r12}; /* Save R0-R12 */                                \
>                                                                          \
>          mrs r11, ELR_hyp;               /* ELR_hyp is return address. */\
> @@ -115,7 +115,7 @@ ENTRY(return_to_hypervisor)
>          ldr r11, [sp, #UREGS_cpsr]
>          msr SPSR_hyp, r11
>          pop {r0-r12}
> -        add sp, #(UREGS_R8_fiq - UREGS_sp); /* SP, LR, SPSR, PC */
> +        add sp, #(UREGS_SP_usr - UREGS_sp); /* SP, LR, SPSR, PC */
>          eret
>  
>  /*
> diff --git a/xen/arch/arm/io.h b/xen/arch/arm/io.h
> index 9a507f5..0933aa8 100644
> --- a/xen/arch/arm/io.h
> +++ b/xen/arch/arm/io.h
> @@ -21,6 +21,7 @@
>  
>  #include <xen/lib.h>
>  #include <asm/processor.h>
> +#include <asm/regs.h>
>  
>  typedef struct
>  {
> diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
> index 19e2081..096dc0b 100644
> --- a/xen/arch/arm/traps.c
> +++ b/xen/arch/arm/traps.c
> @@ -43,7 +43,7 @@
>   * stack) must be doubleword-aligned in size.  */
>  static inline void check_stack_alignment_constraints(void) {
>      BUILD_BUG_ON((sizeof (struct cpu_user_regs)) & 0x7);
> -    BUILD_BUG_ON((offsetof(struct cpu_user_regs, r8_fiq)) & 0x7);
> +    BUILD_BUG_ON((offsetof(struct cpu_user_regs, sp_usr)) & 0x7);
>      BUILD_BUG_ON((sizeof (struct cpu_info)) & 0x7);
>  }
>  
> diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
> index ff02d15..d8788f2 100644
> --- a/xen/include/public/arch-arm.h
> +++ b/xen/include/public/arch-arm.h
> @@ -119,12 +119,15 @@ struct cpu_user_regs
>  
>      /* Outer guest frame only from here on... */
>  
> -    uint32_t r8_fiq, r9_fiq, r10_fiq, r11_fiq, r12_fiq;
> -
>      uint32_t sp_usr; /* LR_usr is the same register as LR, see above */
>  
> -    uint32_t sp_svc, sp_abt, sp_und, sp_irq, sp_fiq;
> -    uint32_t lr_svc, lr_abt, lr_und, lr_irq, lr_fiq;
> +    uint32_t sp_irq, lr_irq;
> +    uint32_t sp_svc, lr_svc;
> +    uint32_t sp_abt, lr_abt;
> +    uint32_t sp_und, lr_und;
> +
> +    uint32_t r8_fiq, r9_fiq, r10_fiq, r11_fiq, r12_fiq;
> +    uint32_t sp_fiq, lr_fiq;
>  
>      uint32_t spsr_svc, spsr_abt, spsr_und, spsr_irq, spsr_fiq;
>  
> -- 
> 1.7.2.5
> 

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