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Re: [PATCH v6 3/4] libelf: Store maximum PHDR p_align
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 28 Mar 2024 17:47:30 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 28 Mar 2024 16:47:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.03.2024 22:51, Jason Andryuk wrote:
> --- a/xen/common/libelf/libelf-loader.c
> +++ b/xen/common/libelf/libelf-loader.c
> @@ -468,6 +468,7 @@ void elf_parse_binary(struct elf_binary *elf)
> {
> ELF_HANDLE_DECL(elf_phdr) phdr;
> uint64_t low = -1, high = 0, paddr, memsz;
> + uint64_t max_align = 0, palign;
> unsigned i, count;
>
> count = elf_phdr_count(elf);
> @@ -481,17 +482,23 @@ void elf_parse_binary(struct elf_binary *elf)
> continue;
> paddr = elf_uval(elf, phdr, p_paddr);
> memsz = elf_uval(elf, phdr, p_memsz);
> - elf_msg(elf, "ELF: phdr: paddr=%#" PRIx64 " memsz=%#" PRIx64 "\n",
> - paddr, memsz);
> + palign = elf_uval(elf, phdr, p_align);
> + elf_msg(elf,
> + "ELF: phdr: paddr=%#" PRIx64 " memsz=%#" PRIx64 " palign=%#"
> PRIx64 "\n",
> + paddr, memsz, palign);
> if ( low > paddr )
> low = paddr;
> if ( high < paddr + memsz )
> high = paddr + memsz;
> + if ( max_align < palign )
> + max_align = palign;
> }
> elf->pstart = low;
> elf->pend = high;
> - elf_msg(elf, "ELF: memory: %#" PRIx64 " -> %#" PRIx64 "\n",
> - elf->pstart, elf->pend);
> + elf->palign = max_align;
> + elf_msg(elf,
> + "ELF: memory: %#" PRIx64 " -> %#" PRIx64 " align:%#" PRIx64 "\n",
> + elf->pstart, elf->pend, elf->palign);
> }
Hmm, it's just this final logging change which I'm a little concerned by:
Having looked at Linux'es phdr, I noticed that the addresses there aren't
necessarily matching the corresponding alignment. Therefore I'm a little
concerned that the output here might raise questions when people see
seemingly inconsistent values in the log. Could you/we at least make it
read like e.g. "align (max): ..."?
Jan
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