xen: arm: Correctly use GLOBAL/ENTRY in head.S, avoid .global

Use ENTRY() for function entry points since it ensures correct
alignment where GLOBAL() doesn't. The exception is the initial start
label which must be at offset 0, so just use GLOBAL() to avoid the
possibility of realignment.

Since everything happens to already be aligned there should be no
difference to the actual binary. objdump agrees.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>

diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
index 2547ce1d6d8ea043789ab05b486b058193485bab..ec5797462cc8e6dcea42f65a45f3272dc8c33242 100644 (file)
--- a/xen/arch/arm/arm32/head.S
+++ b/xen/arch/arm/arm32/head.S
@@ -76,8 +76,7 @@
          * It should be linked at XEN_VIRT_START, and loaded at any
          * 4K-aligned address.  All of text+data+bss must fit in 2MB,
          * or the initial pagetable code below will need adjustment. */
-        .global start
-start:
+GLOBAL(start)
         /* zImage magic header, see:
          * http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html#d0e309
          */
@@ -583,16 +582,15 @@ hex:    .ascii "0123456789abcdef"
 
 #else  /* CONFIG_EARLY_PRINTK */
 
+ENTRY(early_puts)
 init_uart:
-.global early_puts
-early_puts:
 puts:
 putn:   mov   pc, lr
 
 #endif /* !CONFIG_EARLY_PRINTK */
 
 /* This provides a C-API version of __lookup_processor_type */
-GLOBAL(lookup_processor_type)
+ENTRY(lookup_processor_type)
         stmfd sp!, {r4, r10, lr}
         mov   r10, #0                   /* r10 := offset between virt&phys */
         bl    __lookup_processor_type

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index b71b6f081202fa84d328bf68ca13c3d83fcecc04..dcb7071494eb40c7591e01baedb4e48d4dc359b0 100644 (file)
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -100,8 +100,7 @@
          * or the initial pagetable code below will need adjustment.
          */
 
-        .global start
-start:
+GLOBAL(start)
         /*
          * DO NOT MODIFY. Image header expected by Linux boot-loaders.
          */
@@ -604,9 +603,8 @@ hex:    .ascii "0123456789abcdef"
 
 #else  /* CONFIG_EARLY_PRINTK */
 
+ENTRY(early_puts)
 init_uart:
-.global early_puts
-early_puts:
 puts:
 putn:   ret
 
@@ -615,7 +613,7 @@ putn:   ret
 /* This provides a C-API version of __lookup_processor_type
  * TODO: For now, the implementation return NULL every time
  */
-GLOBAL(lookup_processor_type)
+ENTRY(lookup_processor_type)
         mov  x0, #0
         ret