[PATCH 02/13] x86, tools: Consolidate #ifdef code

Matt Fleming
2014-03-04T13:14:36Z

Instead of littering main() with #ifdef CONFIG_EFI_STUB, move the logic
into separate functions that do nothing if the config option isn't set.
This makes main() much easier to read.

Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
arch/x86/boot/tools/build.c | 64 +++++++++++++++++++++++++++++----------------
1 file changed, 42 insertions(+), 22 deletions(-)

diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c
index 8e15b22391fc..bf262077ec92 100644
--- a/arch/x86/boot/tools/build.c
+++ b/arch/x86/boot/tools/build.c
@@ -219,6 +219,45 @@ static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
update_pecoff_section_header(".text", text_start, text_sz);
}

+static int reserve_pecoff_reloc_section(int c)
+{
+ /* Reserve 0x20 bytes for .reloc section */
+ memset(buf+c, 0, PECOFF_RELOC_RESERVE);
+ return PECOFF_RELOC_RESERVE;
+}
+
+static void efi_stub_defaults(void)
+{
+ /* Defaults for old kernel */
+#ifdef CONFIG_X86_32
+ efi_pe_entry = 0x10;
+ efi_stub_entry = 0x30;
+#else
+ efi_pe_entry = 0x210;
+ efi_stub_entry = 0x230;
+ startup_64 = 0x200;
+#endif
+}
+
+static void efi_stub_entry_update(void)
+{
+#ifdef CONFIG_X86_64 /* Yes, this is really how we defined it :( */
+ efi_stub_entry -= 0x200;
+#endif
+ put_unaligned_le32(efi_stub_entry, &buf[0x264]);
+}
+
+#else
+
+static inline void update_pecoff_setup_and_reloc(unsigned int) {}
+static inline void update_pecoff_text(unsigned int, unsigned int) {}
+static inline void efi_stub_defaults(void) {}
+static inline void efi_stup_entry_update(void) {}
+
+static inline int reserve_pecoff_reloc_section(int c)
+{
+ return 0;
+}
#endif /* CONFIG_EFI_STUB */

@@ -271,15 +310,7 @@ int main(int argc, char ** argv)
void *kernel;
u32 crc = 0xffffffffUL;

- /* Defaults for old kernel */
-#ifdef CONFIG_X86_32
- efi_pe_entry = 0x10;
- efi_stub_entry = 0x30;
-#else
- efi_pe_entry = 0x210;
- efi_stub_entry = 0x230;
- startup_64 = 0x200;
-#endif
+ efi_stub_defaults();

if (argc != 5)
usage();
@@ -302,11 +333,7 @@ int main(int argc, char ** argv)
die("Boot block hasn't got boot flag (0xAA55)");
fclose(file);

-#ifdef CONFIG_EFI_STUB
- /* Reserve 0x20 bytes for .reloc section */
- memset(buf+c, 0, PECOFF_RELOC_RESERVE);
- c += PECOFF_RELOC_RESERVE;
-#endif
+ c += reserve_pecoff_reloc_section(c);

/* Pad unused space with zeros */
setup_sectors = (c + 511) / 512;
@@ -315,9 +342,7 @@ int main(int argc, char ** argv)
i = setup_sectors*512;
memset(buf+c, 0, i-c);

-#ifdef CONFIG_EFI_STUB
update_pecoff_setup_and_reloc(i);
-#endif

/* Set the default root device */
put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
@@ -342,14 +367,9 @@ int main(int argc, char ** argv)
buf[0x1f1] = setup_sectors-1;
put_unaligned_le32(sys_size, &buf[0x1f4]);

-#ifdef CONFIG_EFI_STUB
update_pecoff_text(setup_sectors * 512, sz + i + ((sys_size * 16) - sz));

-#ifdef CONFIG_X86_64 /* Yes, this is really how we defined it :( */
- efi_stub_entry -= 0x200;
-#endif
- put_unaligned_le32(efi_stub_entry, &buf[0x264]);
-#endif
+ efi_stub_entry_update();

crc = partial_crc32(buf, i, crc);
if (fwrite(buf, 1, i, dest) != i)
--
1.8.5.3