[PATCH] AArch64: Allow additional sizes in prologue

Alan Hayward Alan.Hayward@arm.com
Tue Aug 6 08:58:00 GMT 2019



> On 5 Aug 2019, at 18:43, Tom Tromey <tom@tromey.com> wrote:
> 
>>>>>> "Alan" == Alan Hayward <Alan.Hayward@arm.com> writes:
> 
> Alan> When saving registers to the stack at the start of a function, not all state
> Alan> needs to be saved. For example, only the first 64bits of float registers need
> Alan> saving.  However, a program may choose to store extra state if it wishes,
> Alan> there is nothing preventing it doing so.
> 
> Alan> The aarch64_analyze_prologue will error if it detects extra state being
> Alan> stored.  Relex this restriction.
> 
> I don't know anything about AArch64, so I can't really comment on the
> content of the patch, but I did happen to see a nit:
> 
> Alan>  	  stack.store (pv_add_constant (regs[rn],
> Alan>  					inst.operands[1].addr.offset.imm),
> Alan> -		       is64 ? 8 : 4, regs[rt]);
> Alan> +					size, regs[rt]);
> 
> ...this addition looked mis-indented to me.

Thanks.
I probably missed that because the correct formatting looks horrible:

	  stack.store (pv_add_constant (regs[rn],
					inst.operands[1].addr.offset.imm),
		       size, regs[rt]);

Instead, I can update it to the following

	  stack.store (
	    pv_add_constant (regs[rn], inst.operands[1].addr.offset.imm),
	    size, regs[rt]);


> 
> Tom



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