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>
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@ -14,11 +14,12 @@
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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#include <asm/fncpy.h>
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#include <asm/mach-types.h>
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#include <asm/smp_plat.h>
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#include <asm/system_misc.h>
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extern const unsigned char relocate_new_kernel[];
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extern void relocate_new_kernel(void);
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extern const unsigned int relocate_new_kernel_size;
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extern unsigned long kexec_start_address;
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@ -142,6 +143,8 @@ void machine_kexec(struct kimage *image)
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{
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unsigned long page_list;
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unsigned long reboot_code_buffer_phys;
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unsigned long reboot_entry = (unsigned long)relocate_new_kernel;
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unsigned long reboot_entry_phys;
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void *reboot_code_buffer;
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/*
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@ -168,16 +171,16 @@ void machine_kexec(struct kimage *image)
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/* copy our kernel relocation code to the control code page */
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memcpy(reboot_code_buffer,
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relocate_new_kernel, relocate_new_kernel_size);
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reboot_entry = fncpy(reboot_code_buffer,
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reboot_entry,
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relocate_new_kernel_size);
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reboot_entry_phys = (unsigned long)reboot_entry +
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(reboot_code_buffer_phys - (unsigned long)reboot_code_buffer);
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flush_icache_range((unsigned long) reboot_code_buffer,
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(unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
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printk(KERN_INFO "Bye!\n");
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if (kexec_reinit)
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kexec_reinit();
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soft_restart(reboot_code_buffer_phys);
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soft_restart(reboot_entry_phys);
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}
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@ -2,10 +2,12 @@
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* relocate_kernel.S - put the kernel image in place to boot
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*/
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#include <linux/linkage.h>
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#include <asm/kexec.h>
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.globl relocate_new_kernel
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relocate_new_kernel:
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.align 3 /* not needed for this code, but keeps fncpy() happy */
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ENTRY(relocate_new_kernel)
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ldr r0,kexec_indirection_page
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ldr r1,kexec_start_address
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@ -79,6 +81,8 @@ kexec_mach_type:
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kexec_boot_atags:
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.long 0x0
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ENDPROC(relocate_new_kernel)
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relocate_new_kernel_end:
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.globl relocate_new_kernel_size
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