linux-kernel - Re: [PATCH v2] ARM: module: Add all unwind tables when load module

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Date:   Thu, 31 Mar 2022 11:38:28 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Chen Zhongjin <chenzhongjin@...wei.com>
Cc:     alexander.sverdlin@...ia.com, ardb@...nel.org,
        linus.walleij@...aro.org, nico@...xnic.net,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: module: Add all unwind tables when load module

On Thu, Mar 31, 2022 at 05:09:09PM +0800, Chen Zhongjin wrote:
>  	for (s = sechdrs; s < sechdrs_end; s++) {
>  		const char *secname = secstrs + s->sh_name;
> +		const Elf_Shdr *txt_sec = find_mod_section(hdr, sechdrs,
> +				strcmp(".ARM.exidx", secname) ?
> +				secname + strlen(".ARM.exidx") : ".text");

In addition to my comments on the above...

>  
> -		if (!(s->sh_flags & SHF_ALLOC))
> +		if (!(s->sh_flags & SHF_ALLOC) ||
> +			s->sh_type != ELF_SECTION_UNWIND)

Please align "s->sh_type" with the ! on the line above (don't use a tab
for this!)

>  			continue;
>  
> -		if (strcmp(".ARM.exidx.init.text", secname) == 0)
> -			maps[ARM_SEC_INIT].unw_sec = s;
> -		else if (strcmp(".ARM.exidx", secname) == 0)
> -			maps[ARM_SEC_CORE].unw_sec = s;
> -		else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
> -			maps[ARM_SEC_EXIT].unw_sec = s;
> -		else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
> -			maps[ARM_SEC_UNLIKELY].unw_sec = s;
> -		else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
> -			maps[ARM_SEC_HOT].unw_sec = s;
> -		else if (strcmp(".init.text", secname) == 0)
> -			maps[ARM_SEC_INIT].txt_sec = s;
> -		else if (strcmp(".text", secname) == 0)
> -			maps[ARM_SEC_CORE].txt_sec = s;
> -		else if (strcmp(".exit.text", secname) == 0)
> -			maps[ARM_SEC_EXIT].txt_sec = s;
> -		else if (strcmp(".text.unlikely", secname) == 0)
> -			maps[ARM_SEC_UNLIKELY].txt_sec = s;
> -		else if (strcmp(".text.hot", secname) == 0)
> -			maps[ARM_SEC_HOT].txt_sec = s;
> +		if (txt_sec) {
> +			struct unwind_table *table =
> +				unwind_table_add(s->sh_addr,
> +						s->sh_size,
> +						txt_sec->sh_addr,
> +						txt_sec->sh_size);

blank line here please.

> +			list_add(&table->mod_list, &unwind_list->mod_list);

and here.

Otherwise, looks good. Thanks.

-- 
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