ARM: 7897/1: kexec: Use the right ISA for relocate_new_kernel

Copying a function with memcpy() and then trying to execute the
result isn't trivially portable to Thumb.

This patch modifies the kexec soft restart code to copy its
assembler trampoline relocate_new_kernel() using fncpy() instead,
so that relocate_new_kernel can be in the same ISA as the rest of
the kernel without problems.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Reported-by: Taras Kondratiuk <taras.kondratiuk@linaro.org>
Tested-by: Taras Kondratiuk <taras.kondratiuk@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 57221e3..f0d180d 100644 (file)
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -14,11 +14,12 @@
 #include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
+#include <asm/fncpy.h>
 #include <asm/mach-types.h>
 #include <asm/smp_plat.h>
 #include <asm/system_misc.h>
 
-extern const unsigned char relocate_new_kernel[];
+extern void relocate_new_kernel(void);
 extern const unsigned int relocate_new_kernel_size;
 
 extern unsigned long kexec_start_address;
@@ -142,6 +143,8 @@ void machine_kexec(struct kimage *image)
 {
        unsigned long page_list;
        unsigned long reboot_code_buffer_phys;
+       unsigned long reboot_entry = (unsigned long)relocate_new_kernel;
+       unsigned long reboot_entry_phys;
        void *reboot_code_buffer;
 
        /*
@@ -168,16 +171,16 @@ void machine_kexec(struct kimage *image)
 
 
        /* copy our kernel relocation code to the control code page */
-       memcpy(reboot_code_buffer,
-              relocate_new_kernel, relocate_new_kernel_size);
+       reboot_entry = fncpy(reboot_code_buffer,
+                            reboot_entry,
+                            relocate_new_kernel_size);
+       reboot_entry_phys = (unsigned long)reboot_entry +
+               (reboot_code_buffer_phys - (unsigned long)reboot_code_buffer);
 
-
-       flush_icache_range((unsigned long) reboot_code_buffer,
-                          (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
        printk(KERN_INFO "Bye!\n");
 
        if (kexec_reinit)
                kexec_reinit();
 
-       soft_restart(reboot_code_buffer_phys);
+       soft_restart(reboot_entry_phys);
 }

diff --git a/arch/arm/kernel/relocate_kernel.S b/arch/arm/kernel/relocate_kernel.S
index d0cdedf..9585896 100644 (file)
--- a/arch/arm/kernel/relocate_kernel.S
+++ b/arch/arm/kernel/relocate_kernel.S
@@ -2,10 +2,12 @@
  * relocate_kernel.S - put the kernel image in place to boot
  */
 
+#include <linux/linkage.h>
 #include <asm/kexec.h>
 
-       .globl relocate_new_kernel
-relocate_new_kernel:
+       .align  3       /* not needed for this code, but keeps fncpy() happy */
+
+ENTRY(relocate_new_kernel)
 
        ldr     r0,kexec_indirection_page
        ldr     r1,kexec_start_address
@@ -79,6 +81,8 @@ kexec_mach_type:
 kexec_boot_atags:
        .long   0x0
 
+ENDPROC(relocate_new_kernel)
+
 relocate_new_kernel_end:
 
        .globl relocate_new_kernel_size