jiffies_64 = jiffies;
#endif
+#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
+/*
+ * On 64-bit, align RODATA to 2MB so that even with CONFIG_DEBUG_RODATA
+ * we retain large page mappings for boundaries spanning kernel text, rodata
+ * and data sections.
+ *
+ * However, kernel identity mappings will have different RWX permissions
+ * to the pages mapping to text and to the pages padding (which are freed) the
+ * text section. Hence kernel identity mappings will be broken to smaller
+ * pages. For 64-bit, kernel text and kernel identity mappings are different,
+ * so we can enable protection checks that come with CONFIG_DEBUG_RODATA,
+ * as well as retain 2MB large page mappings for kernel text.
+ */
+#define X64_ALIGN_DEBUG_RODATA_BEGIN . = ALIGN(HPAGE_SIZE);
+
+#define X64_ALIGN_DEBUG_RODATA_END \
+ . = ALIGN(HPAGE_SIZE); \
+ __end_rodata_hpage_align = .;
+
+#else
+
+#define X64_ALIGN_DEBUG_RODATA_BEGIN
+#define X64_ALIGN_DEBUG_RODATA_END
+
+#endif
+
PHDRS {
text PT_LOAD FLAGS(5); /* R_E */
data PT_LOAD FLAGS(7); /* RWE */
HEAD_TEXT
#ifdef CONFIG_X86_32
. = ALIGN(PAGE_SIZE);
- *(.text.page_aligned)
+ *(.text..page_aligned)
#endif
. = ALIGN(8);
_stext = .;
EXCEPTION_TABLE(16) :text = 0x9090
+ X64_ALIGN_DEBUG_RODATA_BEGIN
RO_DATA(PAGE_SIZE)
+ X64_ALIGN_DEBUG_RODATA_END
/* Data */
.data : AT(ADDR(.data) - LOAD_OFFSET) {
PAGE_ALIGNED_DATA(PAGE_SIZE)
- CACHELINE_ALIGNED_DATA(CONFIG_X86_L1_CACHE_BYTES)
+ CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
DATA_DATA
CONSTRUCTORS
/* rarely changed data like cpu maps */
- READ_MOSTLY_DATA(CONFIG_X86_INTERNODE_CACHE_BYTES)
+ READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)
/* End of data section */
_edata = .;
*(.vsyscall_0)
} :user
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
+ . = ALIGN(L1_CACHE_BYTES);
.vsyscall_fn : AT(VLOAD(.vsyscall_fn)) {
*(.vsyscall_fn)
}
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
+ . = ALIGN(L1_CACHE_BYTES);
.vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data)) {
*(.vsyscall_gtod_data)
}
}
vgetcpu_mode = VVIRT(.vgetcpu_mode);
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
+ . = ALIGN(L1_CACHE_BYTES);
.jiffies : AT(VLOAD(.jiffies)) {
*(.jiffies)
}
.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
__smp_locks = .;
*(.smp_locks)
- __smp_locks_end = .;
. = ALIGN(PAGE_SIZE);
+ __smp_locks_end = .;
}
#ifdef CONFIG_X86_64
. = ALIGN(PAGE_SIZE);
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
__bss_start = .;
- *(.bss.page_aligned)
+ *(.bss..page_aligned)
*(.bss)
. = ALIGN(4);
__bss_stop = .;
__brk_limit = .;
}
- .end : AT(ADDR(.end) - LOAD_OFFSET) {
- _end = .;
- }
+ _end = .;
STABS_DEBUG
DWARF_DEBUG
#ifdef CONFIG_X86_32
+/*
+ * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
+ */
. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
"kernel image bigger than KERNEL_IMAGE_SIZE");
#else
* Per-cpu symbols which need to be offset from __per_cpu_load
* for the boot processor.
*/
-#define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
+#define INIT_PER_CPU(x) init_per_cpu__##x = x + __per_cpu_load
INIT_PER_CPU(gdt_page);
INIT_PER_CPU(irq_stack_union);
"kernel image bigger than KERNEL_IMAGE_SIZE");
#ifdef CONFIG_SMP
-. = ASSERT((per_cpu__irq_stack_union == 0),
+. = ASSERT((irq_stack_union == 0),
"irq_stack_union is not at start of per-cpu area");
#endif