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authorChristoph Hellwig <hch@lst.de>2019-06-13 09:08:55 +0200
committerGreg Ungerer <gerg@kernel.org>2019-06-24 09:16:47 +1000
commit34b4664ac4824d6c7a8b29db24b18733df07b2f4 (patch)
treeb94e0eccb77f806991a97477d09f30ff2ba91b1b
parent3f8b76a66e0d49e3afaba595b9762c126448e783 (diff)
binfmt_flat: use fixed size type for the on-disk format
So far binfmt_flat has only been supported on 32-bit platforms, so the variable size of the fields didn't matter. But the upcoming RISC-V nommu port supports 64-bit CPUs, and we now have a conflict between the elf2flt creation tool that always uses 32-bit fields and the kernel that uses (unsigned) long field. Switch to the userspace view as the rest of the binfmt_flat format is completely architecture neutral, and binfmt_flat isn't the right binary format for huge executables to start with. While we're at it also ensure these fields are using __be types as they big endian and are byte swapped when loaded. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
-rw-r--r--include/linux/flat.h44
1 files changed, 22 insertions, 22 deletions
diff --git a/include/linux/flat.h b/include/linux/flat.h
index 19c586b74b99..d586bb6e64a7 100644
--- a/include/linux/flat.h
+++ b/include/linux/flat.h
@@ -24,26 +24,26 @@
*/
struct flat_hdr {
- char magic[4];
- unsigned long rev; /* version (as above) */
- unsigned long entry; /* Offset of first executable instruction
- with text segment from beginning of file */
- unsigned long data_start; /* Offset of data segment from beginning of
- file */
- unsigned long data_end; /* Offset of end of data segment
- from beginning of file */
- unsigned long bss_end; /* Offset of end of bss segment from beginning
- of file */
+ char magic[4];
+ __be32 rev; /* version (as above) */
+ __be32 entry; /* Offset of first executable instruction
+ with text segment from beginning of file */
+ __be32 data_start; /* Offset of data segment from beginning of
+ file */
+ __be32 data_end; /* Offset of end of data segment from beginning
+ of file */
+ __be32 bss_end; /* Offset of end of bss segment from beginning
+ of file */
/* (It is assumed that data_end through bss_end forms the bss segment.) */
- unsigned long stack_size; /* Size of stack, in bytes */
- unsigned long reloc_start; /* Offset of relocation records from
- beginning of file */
- unsigned long reloc_count; /* Number of relocation records */
- unsigned long flags;
- unsigned long build_date; /* When the program/library was built */
- unsigned long filler[5]; /* Reservered, set to zero */
+ __be32 stack_size; /* Size of stack, in bytes */
+ __be32 reloc_start; /* Offset of relocation records from beginning of
+ file */
+ __be32 reloc_count; /* Number of relocation records */
+ __be32 flags;
+ __be32 build_date; /* When the program/library was built */
+ __u32 filler[5]; /* Reservered, set to zero */
};
#define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */
@@ -67,15 +67,15 @@ struct flat_hdr {
#define OLD_FLAT_RELOC_TYPE_BSS 2
typedef union {
- unsigned long value;
+ u32 value;
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD) || \
(defined(mc68000) && !defined(CONFIG_COLDFIRE))
- signed long offset : 30;
- unsigned long type : 2;
+ s32 offset : 30;
+ u32 type : 2;
# elif defined(__BIG_ENDIAN_BITFIELD)
- unsigned long type : 2;
- signed long offset : 30;
+ u32 type : 2;
+ s32 offset : 30;
# else
# error "Unknown bitfield order for flat files."
# endif