@@ -49,16 +49,13 @@
* Position Independent Executable (PIE) so that linker won't optimize
* R_386_GOT32X relocation to its fixed symbol address. Older
* linkers generate R_386_32 relocations against locally defined symbols,
- * _bss, _ebss, _got, _egot and _end, in PIE. It isn't wrong, just less
- * optimal than R_386_RELATIVE. But the x86 kernel fails to properly handle
- * R_386_32 relocations when relocating the kernel. To generate
- * R_386_RELATIVE relocations, we mark _bss, _ebss, _got, _egot and _end as
- * hidden:
+ * _bss, _ebss and _end, in PIE. It isn't wrong, just less optimal than
+ * R_386_RELATIVE. But the x86 kernel fails to properly handle R_386_32
+ * relocations when relocating the kernel. To generate R_386_RELATIVE
+ * relocations, we mark _bss, _ebss and _end as hidden:
*/
.hidden _bss
.hidden _ebss
- .hidden _got
- .hidden _egot
.hidden _end
__HEAD
@@ -192,19 +189,6 @@ SYM_FUNC_START_LOCAL_NOALIGN(.Lrelocated)
shrl $2, %ecx
rep stosl
-/*
- * Adjust our own GOT
- */
- leal _got(%ebx), %edx
- leal _egot(%ebx), %ecx
-1:
- cmpl %ecx, %edx
- jae 2f
- addl %ebx, (%edx)
- addl $4, %edx
- jmp 1b
-2:
-
/*
* Do the extraction, and jump to the new kernel..
*/
@@ -40,8 +40,6 @@
*/
.hidden _bss
.hidden _ebss
- .hidden _got
- .hidden _egot
.hidden _end
__HEAD
@@ -353,25 +351,6 @@ SYM_CODE_START(startup_64)
/* Set up the stack */
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.
@@ -43,9 +43,7 @@ SECTIONS
_erodata = . ;
}
.got : {
- _got = .;
- KEEP(*(.got))
- _egot = .;
+ *(.got)
}
.got.plt : {
*(.got.plt)