[Xen-devel] [PATCH v2 1/3] x86/boot: Early data should live in init.rodata

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

No real change as these were already in the init section, but does move it out
of a text section.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Keir Fraser <keir@xxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>

---
v2: All data can live in init.rodata
    Fix up some missing @progbits
    Pad before gdt_boot_descr to align its long.
---
 xen/arch/x86/boot/cmdline.S |    4 ++++
 xen/arch/x86/boot/head.S    |   14 +++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/boot/cmdline.S b/xen/arch/x86/boot/cmdline.S
index e1f4595..00687eb 100644
--- a/xen/arch/x86/boot/cmdline.S
+++ b/xen/arch/x86/boot/cmdline.S
@@ -329,6 +329,8 @@ cmdline_parse_early:
         popa
         ret
 
+        .pushsection .init.rodata, "a", @progbits
+
 .Lvga_text_modes: /* rows, mode_number */
         .word   25,VIDEO_80x25
         .word   50,VIDEO_80x50
@@ -361,3 +363,5 @@ cmdline_parse_early:
         .asciz  "no"
 .Ledd_opt:
         .asciz  "edd"
+
+        .popsection
diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
index 1777c17..0d87b27 100644
--- a/xen/arch/x86/boot/head.S
+++ b/xen/arch/x86/boot/head.S
@@ -32,11 +32,19 @@ ENTRY(start)
         /* Checksum: must be the negated sum of the first two fields. */
         .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
 
-        .section .init.text, "ax"
+        .section .init.rodata, "a", @progbits
+        .align 4
+
+        .word   0
+gdt_boot_descr:
+        .word   6*8-1
+        .long   sym_phys(trampoline_gdt)
 
 .Lbad_cpu_msg: .asciz "ERR: Not a 64-bit CPU!"
 .Lbad_ldr_msg: .asciz "ERR: Not a Multiboot bootloader!"
 
+        .section .init.text, "ax", @progbits
+
 bad_cpu:
         mov     $(sym_phys(.Lbad_cpu_msg)),%esi # Error message
         jmp     print_err
@@ -59,10 +67,6 @@ print_err:
         stosb                  # Write an attribute to the VGA framebuffer
         jmp     1b
 
-gdt_boot_descr:
-        .word   6*8-1
-        .long   sym_phys(trampoline_gdt)
-
 __start:
         cld
         cli
-- 
1.7.10.4


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