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s390/boot: factor out offset_vmlinux_info() function

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Move offsetting all of vmlinux_info fields to a separate
function for better readability.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2021-08-06 12:55:09 +02:00 committed by Heiko Carstens
parent ddd63c85ef
commit e8f06683d4
1 changed files with 12 additions and 8 deletions
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20
arch/s390/boot/startup.c
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@ -248,6 +248,17 @@ static void setup_vmalloc_size(void)
vmalloc_size = max(size, vmalloc_size);
}
static void offset_vmlinux_info(unsigned long offset)
{
vmlinux.default_lma += offset;
*(unsigned long *)(&vmlinux.entry) += offset;
vmlinux.bootdata_off += offset;
vmlinux.bootdata_preserved_off += offset;
vmlinux.rela_dyn_start += offset;
vmlinux.rela_dyn_end += offset;
vmlinux.dynsym_start += offset;
}
void startup_kernel(void)
{
unsigned long random_lma;
@ -273,19 +284,12 @@ void startup_kernel(void)
setup_vmalloc_size();
setup_kernel_memory_layout();
random_lma = __kaslr_offset = 0;
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled) {
random_lma = get_random_base(safe_addr);
if (random_lma) {
__kaslr_offset = random_lma - vmlinux.default_lma;
img = (void *)vmlinux.default_lma;
vmlinux.default_lma += __kaslr_offset;
*(unsigned long *)(&vmlinux.entry) += __kaslr_offset;
vmlinux.bootdata_off += __kaslr_offset;
vmlinux.bootdata_preserved_off += __kaslr_offset;
vmlinux.rela_dyn_start += __kaslr_offset;
vmlinux.rela_dyn_end += __kaslr_offset;
vmlinux.dynsym_start += __kaslr_offset;
offset_vmlinux_info(__kaslr_offset);
}
}