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From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Chen Zhongjin <chenzhongjin@huawei.com>
Cc: alexander.sverdlin@nokia.com, ardb@kernel.org,
	linus.walleij@linaro.org, nico@fluxnic.net,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] ARM: module: Add all unwind tables when load module
Date: Thu, 31 Mar 2022 11:38:28 +0100	[thread overview]
Message-ID: <YkWEpC4R1roLwlN/@shell.armlinux.org.uk> (raw)
In-Reply-To: <20220331090909.113387-1-chenzhongjin@huawei.com>

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.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Chen Zhongjin <chenzhongjin@huawei.com>
Cc: alexander.sverdlin@nokia.com, ardb@kernel.org,
	linus.walleij@linaro.org, nico@fluxnic.net,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] ARM: module: Add all unwind tables when load module
Date: Thu, 31 Mar 2022 11:38:28 +0100	[thread overview]
Message-ID: <YkWEpC4R1roLwlN/@shell.armlinux.org.uk> (raw)
In-Reply-To: <20220331090909.113387-1-chenzhongjin@huawei.com>

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.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

  reply	other threads:[~2022-03-31 10:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-31  9:09 [PATCH v2] ARM: module: Add all unwind tables when load module Chen Zhongjin
2022-03-31  9:09 ` Chen Zhongjin
2022-03-31 10:38 ` Russell King (Oracle) [this message]
2022-03-31 10:38   ` Russell King (Oracle)
2022-04-01  2:10   ` Chen Zhongjin
2022-04-01  2:10     ` Chen Zhongjin

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