linux-kernel - Re: [PATCH] module: Add the print format of Elf

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Date:   Fri, 10 Aug 2018 08:36:03 +0800
From:   Zong Li <zongbox@...il.com>
To:     Zong Li <zong@...estech.com>
Cc:     Palmer Dabbelt <palmer@...ive.com>, aou@...s.berkeley.edu,
        arnd@...db.de, schwab@...e.de, hch@...radead.org,
        linux-riscv@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org, greentime@...estech.com
Subject: Re: [PATCH] module: Add the print format of Elf_Addr for 32/64-bit compatibly

Zong Li <zong@...estech.com> 於 2018年7月17日 週二 上午11:06寫道：
>
> Use a similar way like fixed width integer types in inttypes.h.
>
> For the ELF, the Elf32_Addr is int type and Elf64_Addr is long long
> type. It is opposite to definition of inttypes.h, so the Elf_Addr cannot
> re-use the header.
>
> In many architectures, the module loader only print the message of
> module name and relocation type except the address information. We can
> print the address correctly without compile warning by using PRIdEA,
> PRIxEA and so on.
>
> Signed-off-by: Zong Li <zong@...estech.com>
> ---
>  arch/riscv/kernel/module.c   | 13 +++++++------
>  include/asm-generic/module.h |  9 +++++++++
>  2 files changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
> index 3303ed2cd419..d839528e491a 100644
> --- a/arch/riscv/kernel/module.c
> +++ b/arch/riscv/kernel/module.c
> @@ -16,11 +16,12 @@
>  #include <linux/err.h>
>  #include <linux/errno.h>
>  #include <linux/moduleloader.h>
> +#include <asm-generic/module.h>
>
>  static int apply_r_riscv_32_rela(struct module *me, u32 *location, Elf_Addr v)
>  {
>         if (v != (u32)v) {
> -               pr_err("%s: value %016llx out of range for 32-bit field\n",
> +               pr_err("%s: value %016" PRIxEA "out of range for 32-bit field\n",
>                        me->name, v);
>                 return -EINVAL;
>         }
> @@ -101,7 +102,7 @@ static int apply_r_riscv_pcrel_hi20_rela(struct module *me, u32 *location,
>
>         if (offset != (s32)offset) {
>                 pr_err(
> -                 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
> +                 "%s: target %016" PRIxEA "can not be addressed by the 32-bit offset from PC = %p\n",
>                   me->name, v, location);
>                 return -EINVAL;
>         }
> @@ -143,7 +144,7 @@ static int apply_r_riscv_hi20_rela(struct module *me, u32 *location,
>
>         if (IS_ENABLED(CMODEL_MEDLOW)) {
>                 pr_err(
> -                 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
> +                 "%s: target %016" PRIxEA "can not be addressed by the 32-bit offset from PC = %p\n",
>                   me->name, v, location);
>                 return -EINVAL;
>         }
> @@ -187,7 +188,7 @@ static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location,
>                 offset = (void *)offset - (void *)location;
>         } else {
>                 pr_err(
> -                 "%s: can not generate the GOT entry for symbol = %016llx from PC = %p\n",
> +                 "%s: can not generate the GOT entry for symbol = %016" PRIxEA "from PC = %p\n",
>                   me->name, v, location);
>                 return -EINVAL;
>         }
> @@ -211,7 +212,7 @@ static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location,
>                         offset = (void *)offset - (void *)location;
>                 } else {
>                         pr_err(
> -                         "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
> +                         "%s: target %016" PRIxEA "can not be addressed by the 32-bit offset from PC = %p\n",
>                           me->name, v, location);
>                         return -EINVAL;
>                 }
> @@ -233,7 +234,7 @@ static int apply_r_riscv_call_rela(struct module *me, u32 *location,
>
>         if (offset != fill_v) {
>                 pr_err(
> -                 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
> +                 "%s: target %016" PRIxEA "can not be addressed by the 32-bit offset from PC = %p\n",
>                   me->name, v, location);
>                 return -EINVAL;
>         }
> diff --git a/include/asm-generic/module.h b/include/asm-generic/module.h
> index 98e1541b72b7..d358f2414e5e 100644
> --- a/include/asm-generic/module.h
> +++ b/include/asm-generic/module.h
> @@ -27,6 +27,7 @@ struct mod_arch_specific
>  #endif
>  #define ELF_R_TYPE(X)  ELF64_R_TYPE(X)
>  #define ELF_R_SYM(X)   ELF64_R_SYM(X)
> +#define ELF_ADDR_PREFIX "ll"
>
>  #else /* CONFIG_64BIT */
>
> @@ -44,6 +45,14 @@ struct mod_arch_specific
>  #endif
>  #define ELF_R_TYPE(X)  ELF32_R_TYPE(X)
>  #define ELF_R_SYM(X)   ELF32_R_SYM(X)
> +#define ELF_ADDR_PREFIX
>  #endif
>
> +#define PRIdEA ELF_ADDR_PREFIX "d" /* signed decimal */
> +#define PRIiEA ELF_ADDR_PREFIX "i" /* signed decimal */
> +#define PRIuEA ELF_ADDR_PREFIX "u" /* unsigned decimal */
> +#define PRIoEA ELF_ADDR_PREFIX "o" /* unsigned octal */
> +#define PRIxEA ELF_ADDR_PREFIX "x" /* unsigned lowercase hexadecimal */
> +#define PRIXEA ELF_ADDR_PREFIX "X" /* unsigned uppercase hexadecimal */
> +
>  #endif /* __ASM_GENERIC_MODULE_H */
> --
> 2.16.1
>

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