linux-kernel - Re: [PATCH 00/14] Fix wrong %pF and %pS printk format specifier usages

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Date:   Thu, 14 Sep 2017 17:03:02 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Helge Deller <deller@....de>
Cc:     "Luck, Tony" <tony.luck@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH 00/14] Fix wrong %pF and %pS printk format specifier
 usages

On (09/14/17 16:40), Sergey Senozhatsky wrote:
[..]
> powerpc and parisc handle kernel .opd section as well:
> 
> arch/powerpc/kernel/vmlinux.lds.S:      .opd
> arch/parisc/kernel/vmlinux.lds.S:       .opd

for modules, arch-s define mod_arch_specific struct.

parisc has .opd

(fdesc offset should be the start of .opd,
 fdesc_offset + sizeof(fdesc) * fdesc_count should be the .opd address range)

struct mod_arch_specific
{
        unsigned long got_offset, got_count, got_max;
        unsigned long fdesc_offset, fdesc_count, fdesc_max;
        struct {
                unsigned long stub_offset;
                unsigned int stub_entries;
                } *section;
        int unwind_section;
        struct unwind_table *unwind;
};


ia64 has .opd

struct mod_arch_specific {
        struct elf64_shdr *core_plt;    /* core PLT section */
        struct elf64_shdr *init_plt;    /* init PLT section */
        struct elf64_shdr *got;         /* global offset table */
        struct elf64_shdr *opd;         /* official procedure descriptors */
        struct elf64_shdr *unwind;      /* unwind-table section */
        unsigned long gp;               /* global-pointer for module */

        void *core_unw_table;           /* core unwind-table cookie returned by unwinder */
        void *init_unw_table;           /* init unwind-table cookie returned by unwinder */
        unsigned int next_got_entry;    /* index of next available got entry */
};


powerpc does not keep track of .opd, need to add

struct mod_arch_specific {
#ifdef __powerpc64__
        unsigned int stubs_section;     /* Index of stubs section in module */
        unsigned int toc_section;       /* What section is the TOC? */
        bool toc_fixed;                 /* Have we fixed up .TOC.? */
#ifdef CONFIG_DYNAMIC_FTRACE
        unsigned long toc;
        unsigned long tramp;
#endif

#else /* powerpc64 */
        /* Indices of PLT sections within module. */
        unsigned int core_plt_section;
        unsigned int init_plt_section;
#ifdef CONFIG_DYNAMIC_FTRACE
        unsigned long tramp;
#endif
#endif /* powerpc64 */

        /* List of BUG addresses, source line numbers and filenames */
        struct list_head bug_list;
        struct bug_entry *bug_table;
        unsigned int num_bugs;
};


seems like we are looking at a solution here.

thoughts?

	-ss