PATCH: Support IMAGE_SCN_ALIGN_XXXXBYTES
H.J. Lu
hjl@lucon.org
Wed Aug 1 23:19:00 GMT 2007
On Wed, Aug 01, 2007 at 06:12:09PM +0100, Nick Clifton wrote:
> Hi H.J.
>
> >This patch supports IMAGE_SCN_ALIGN_XXXXBYTES. OK to install?
>
> Not quite...
>
> >+ case IMAGE_SCN_ALIGN_4BYTES:
> >+ case IMAGE_SCN_ALIGN_2BYTES:
> >+ case IMAGE_SCN_ALIGN_1BYTES:
> >+ section->alignment_power = (alignment_power >> 20) - 1;
>
> I like this, but I do not like the presence of the magic number 20.
> I think that using a macro would be better. eg:
>
> section->alignment_power = IMAGE_SCN_ALIGN_NUMBER (alignment_power) - 1;
>
> And then in pe.h....
>
> /* Bit position in the s_flags field where the alignment values start.
> */
> #define IMAGE_SCN_ALIGN_BIT_POS 20
> #define IMAGE_SCN_ALIGN_NUMBER(val) ((val) >> IMAGE_SCN_ALIGN_BIT_POS)
> #define IMAGE_SCN_ALIGN_CONSTANT(val) ((val) << IMAGE_SCN_ALIGN_BIT_POS)
>
> #define IMAGE_SCN_ALIGN_1BYTES IMAGE_SCN_ALIGN_CONSTANT(1)
> #define IMAGE_SCN_ALIGN_2BYTES IMAGE_SCN_ALIGN_CONSTANT(2)
> ...
> #define IMAGE_SCN_ALIGN_8129BYTES IMAGE_SCN_ALIGN_CONSTANT(15)
>
> Cheers
> Nick
>
#define IMAGE_SCN_ALIGN_1BYTES IMAGE_SCN_ALIGN_CONSTANT(1)
doesn't make senses since 2**1 is 2. Here is the updated patch.
I used
#define IMAGE_SCN_ALIGN_1BYTES IMAGE_SCN_ALIGN_POWER_CONST (0)
since 2**0 is 1. OK to install?
H.J.
----
bfd/
2007-08-01 H.J. Lu <hongjiu.lu@intel.com>
* coffcode.h (ALIGN_SET): Removed.
(ELIFALIGN_SET): Likewise.
(coff_set_alignment_hook): Handle IMAGE_SCN_ALIGN_128BYTES,
IMAGE_SCN_ALIGN_256BYTES, IMAGE_SCN_ALIGN_512BYTES,
IMAGE_SCN_ALIGN_1024BYTES, IMAGE_SCN_ALIGN_2048BYTES,
IMAGE_SCN_ALIGN_4096BYTES and IMAGE_SCN_ALIGN_8192BYTES.
include/coff/
2007-08-01 H.J. Lu <hongjiu.lu@intel.com>
* pe.h (IMAGE_SCN_ALIGN_POWER_BIT_POS): New.
(IMAGE_SCN_ALIGN_POWER_BIT_MASK): Likewise.
(IMAGE_SCN_ALIGN_POWER_NUM): Likewise.
(IMAGE_SCN_ALIGN_POWER_CONST): Likewise.
(IMAGE_SCN_ALIGN_128BYTES): Likewise.
(IMAGE_SCN_ALIGN_256BYTES): Likewise.
(IMAGE_SCN_ALIGN_512BYTES): Likewise.
(IMAGE_SCN_ALIGN_1024BYTES): Likewise.
(IMAGE_SCN_ALIGN_2048BYTES): Likewise.
(IMAGE_SCN_ALIGN_4096BYTES): Likewise.
(IMAGE_SCN_ALIGN_8192BYTES): Likewise.
(IMAGE_SCN_ALIGN_1BYTES): Redefined with
IMAGE_SCN_ALIGN_POWER_CONST.
(IMAGE_SCN_ALIGN_2BYTES): Likewise.
(IMAGE_SCN_ALIGN_4BYTES): Likewise.
(IMAGE_SCN_ALIGN_8BYTES): Likewise.
(IMAGE_SCN_ALIGN_16BYTES): Likewise.
(IMAGE_SCN_ALIGN_32BYTES): Likewise.
(IMAGE_SCN_ALIGN_64BYTES): Likewise.
--- binutils/bfd/coffcode.h.align 2007-08-01 11:12:53.000000000 -0700
+++ binutils/bfd/coffcode.h 2007-08-01 16:04:27.000000000 -0700
@@ -1628,19 +1628,6 @@ coff_set_alignment_hook (bfd * abfd ATTR
#else /* ! COFF_ALIGN_IN_SECTION_HEADER */
#ifdef COFF_WITH_PE
-/* A couple of macros to help setting the alignment power field. */
-#define ALIGN_SET(field, x, y) \
- if (((field) & IMAGE_SCN_ALIGN_64BYTES) == x)\
- {\
- section->alignment_power = y;\
- }
-
-#define ELIFALIGN_SET(field, x, y) \
- else if (((field) & IMAGE_SCN_ALIGN_64BYTES) == x) \
- {\
- section->alignment_power = y;\
- }
-
static void
coff_set_alignment_hook (bfd * abfd ATTRIBUTE_UNUSED,
asection * section,
@@ -1648,14 +1635,31 @@ coff_set_alignment_hook (bfd * abfd ATTR
{
struct internal_scnhdr *hdr = (struct internal_scnhdr *) scnhdr;
bfd_size_type amt;
+ unsigned int alignment_power_const
+ = hdr->s_flags & IMAGE_SCN_ALIGN_POWER_BIT_MASK;
- ALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_64BYTES, 6)
- ELIFALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_32BYTES, 5)
- ELIFALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_16BYTES, 4)
- ELIFALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_8BYTES, 3)
- ELIFALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_4BYTES, 2)
- ELIFALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_2BYTES, 1)
- ELIFALIGN_SET (hdr->s_flags, IMAGE_SCN_ALIGN_1BYTES, 0)
+ switch (alignment_power_const)
+ {
+ case IMAGE_SCN_ALIGN_8192BYTES:
+ case IMAGE_SCN_ALIGN_4096BYTES:
+ case IMAGE_SCN_ALIGN_2048BYTES:
+ case IMAGE_SCN_ALIGN_1024BYTES:
+ case IMAGE_SCN_ALIGN_512BYTES:
+ case IMAGE_SCN_ALIGN_256BYTES:
+ case IMAGE_SCN_ALIGN_128BYTES:
+ case IMAGE_SCN_ALIGN_64BYTES:
+ case IMAGE_SCN_ALIGN_32BYTES:
+ case IMAGE_SCN_ALIGN_16BYTES:
+ case IMAGE_SCN_ALIGN_8BYTES:
+ case IMAGE_SCN_ALIGN_4BYTES:
+ case IMAGE_SCN_ALIGN_2BYTES:
+ case IMAGE_SCN_ALIGN_1BYTES:
+ section->alignment_power
+ = IMAGE_SCN_ALIGN_POWER_NUM (alignment_power_const);
+ break;
+ default:
+ break;
+ }
/* In a PE image file, the s_paddr field holds the virtual size of a
section, while the s_size field holds the raw size. We also keep
--- binutils/include/coff/pe.h.align 2006-12-05 11:27:59.000000000 -0800
+++ binutils/include/coff/pe.h 2007-08-01 16:06:12.000000000 -0700
@@ -66,13 +66,29 @@
#define IMAGE_SCN_MEM_LOCKED 0x00040000
#define IMAGE_SCN_MEM_PRELOAD 0x00080000
-#define IMAGE_SCN_ALIGN_1BYTES 0x00100000
-#define IMAGE_SCN_ALIGN_2BYTES 0x00200000
-#define IMAGE_SCN_ALIGN_4BYTES 0x00300000
-#define IMAGE_SCN_ALIGN_8BYTES 0x00400000
-#define IMAGE_SCN_ALIGN_16BYTES 0x00500000 /* Default alignment if no others are specified. */
-#define IMAGE_SCN_ALIGN_32BYTES 0x00600000
-#define IMAGE_SCN_ALIGN_64BYTES 0x00700000
+/* Bit position in the s_flags field where the alignment values start. */
+#define IMAGE_SCN_ALIGN_POWER_BIT_POS 20
+#define IMAGE_SCN_ALIGN_POWER_BIT_MASK 0x00f00000
+#define IMAGE_SCN_ALIGN_POWER_NUM(val) \
+ (((val) >> IMAGE_SCN_ALIGN_POWER_BIT_POS) - 1)
+#define IMAGE_SCN_ALIGN_POWER_CONST(val) \
+ (((val) + 1) << IMAGE_SCN_ALIGN_POWER_BIT_POS)
+
+#define IMAGE_SCN_ALIGN_1BYTES IMAGE_SCN_ALIGN_POWER_CONST (0)
+#define IMAGE_SCN_ALIGN_2BYTES IMAGE_SCN_ALIGN_POWER_CONST (1)
+#define IMAGE_SCN_ALIGN_4BYTES IMAGE_SCN_ALIGN_POWER_CONST (2)
+#define IMAGE_SCN_ALIGN_8BYTES IMAGE_SCN_ALIGN_POWER_CONST (3)
+/* Default alignment if no others are specified. */
+#define IMAGE_SCN_ALIGN_16BYTES IMAGE_SCN_ALIGN_POWER_CONST (4)
+#define IMAGE_SCN_ALIGN_32BYTES IMAGE_SCN_ALIGN_POWER_CONST (5)
+#define IMAGE_SCN_ALIGN_64BYTES IMAGE_SCN_ALIGN_POWER_CONST (6)
+#define IMAGE_SCN_ALIGN_128BYTES IMAGE_SCN_ALIGN_POWER_CONST (7)
+#define IMAGE_SCN_ALIGN_256BYTES IMAGE_SCN_ALIGN_POWER_CONST (8)
+#define IMAGE_SCN_ALIGN_512BYTES IMAGE_SCN_ALIGN_POWER_CONST (9)
+#define IMAGE_SCN_ALIGN_1024BYTES IMAGE_SCN_ALIGN_POWER_CONST (10)
+#define IMAGE_SCN_ALIGN_2048BYTES IMAGE_SCN_ALIGN_POWER_CONST (11)
+#define IMAGE_SCN_ALIGN_4096BYTES IMAGE_SCN_ALIGN_POWER_CONST (12)
+#define IMAGE_SCN_ALIGN_8192BYTES IMAGE_SCN_ALIGN_POWER_CONST (13)
#define IMAGE_SCN_LNK_NRELOC_OVFL 0x01000000 /* Section contains extended relocations. */
#define IMAGE_SCN_MEM_NOT_CACHED 0x04000000 /* Section is not cachable. */
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