diff options
Diffstat (limited to 'arch/x86/boot/compressed/head_64.S')
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 57 |
1 files changed, 0 insertions, 57 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 97d37f0a34f5..bf1ab30acc5b 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -40,8 +40,6 @@ */ .hidden _bss .hidden _ebss - .hidden _got - .hidden _egot .hidden _end __HEAD @@ -354,25 +352,6 @@ SYM_CODE_START(startup_64) leaq boot_stack_end(%rbx), %rsp /* - * paging_prepare() and cleanup_trampoline() below can have GOT - * references. Adjust the table with address we are running at. - * - * Zero RAX for adjust_got: the GOT was not adjusted before; - * there's no adjustment to undo. - */ - xorq %rax, %rax - - /* - * Calculate the address the binary is loaded at and use it as - * a GOT adjustment. - */ - call 1f -1: popq %rdi - subq $1b, %rdi - - call .Ladjust_got - - /* * At this point we are in long mode with 4-level paging enabled, * but we might want to enable 5-level paging or vice versa. * @@ -464,21 +443,6 @@ trampoline_return: pushq $0 popfq - /* - * Previously we've adjusted the GOT with address the binary was - * loaded at. Now we need to re-adjust for relocation address. - * - * Calculate the address the binary is loaded at, so that we can - * undo the previous GOT adjustment. - */ - call 1f -1: popq %rax - subq $1b, %rax - - /* The new adjustment is the relocation address */ - movq %rbx, %rdi - call .Ladjust_got - /* * Copy the compressed kernel to the end of our buffer * where decompression in place becomes safe. @@ -556,27 +520,6 @@ SYM_FUNC_START_LOCAL_NOALIGN(.Lrelocated) jmp *%rax SYM_FUNC_END(.Lrelocated) -/* - * Adjust the global offset table - * - * RAX is the previous adjustment of the table to undo (use 0 if it's the - * first time we touch GOT). - * RDI is the new adjustment to apply. - */ -.Ladjust_got: - /* Walk through the GOT adding the address to the entries */ - leaq _got(%rip), %rdx - leaq _egot(%rip), %rcx -1: - cmpq %rcx, %rdx - jae 2f - subq %rax, (%rdx) /* Undo previous adjustment */ - addq %rdi, (%rdx) /* Apply the new adjustment */ - addq $8, %rdx - jmp 1b -2: - ret - .code32 /* * This is the 32-bit trampoline that will be copied over to low memory. |