diff options
Diffstat (limited to 'arch/x86/boot/compressed/head_64.S')
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 56 |
1 files changed, 15 insertions, 41 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 50f69c7eaaf4..2884e0c3e8a5 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -32,33 +32,6 @@ #include <asm/processor-flags.h> #include <asm/asm-offsets.h> -/* - * Adjust our own GOT - * - * The relocation base must be in %rbx - * - * It is safe to call this macro more than once, because in some of the - * code paths multiple invocations are inevitable, e.g. via the efi* - * entry points. - * - * Relocation is only performed the first time. - */ -.macro FIXUP_GOT - cmpb $1, got_fixed(%rip) - je 2f - - leaq _got(%rip), %rdx - leaq _egot(%rip), %rcx -1: - cmpq %rcx, %rdx - jae 2f - addq %rbx, (%rdx) - addq $8, %rdx - jmp 1b -2: - movb $1, got_fixed(%rip) -.endm - __HEAD .code32 ENTRY(startup_32) @@ -279,13 +252,10 @@ ENTRY(efi_pe_entry) subq $1b, %rbp /* - * Relocate efi_config->call() and the GOT entries. + * Relocate efi_config->call(). */ addq %rbp, efi64_config+88(%rip) - movq %rbp, %rbx - FIXUP_GOT - movq %rax, %rdi call make_boot_params cmpq $0,%rax @@ -301,13 +271,10 @@ handover_entry: subq $1b, %rbp /* - * Relocate efi_config->call() and the GOT entries. + * Relocate efi_config->call(). */ movq efi_config(%rip), %rax addq %rbp, 88(%rax) - - movq %rbp, %rbx - FIXUP_GOT 2: movq efi_config(%rip), %rdi call efi_main @@ -418,8 +385,19 @@ relocated: shrq $3, %rcx rep stosq - FIXUP_GOT - +/* + * Adjust our own GOT + */ + leaq _got(%rip), %rdx + leaq _egot(%rip), %rcx +1: + cmpq %rcx, %rdx + jae 2f + addq %rbx, (%rdx) + addq $8, %rdx + jmp 1b +2: + /* * Do the decompression, and jump to the new kernel.. */ @@ -459,10 +437,6 @@ gdt: .quad 0x0000000000000000 /* TS continued */ gdt_end: -/* Have we relocated the GOT? */ -got_fixed: - .byte 0 - #ifdef CONFIG_EFI_STUB efi_config: .quad 0 |