const char *symbols_lookup(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset,
char *namebuf)
{
unsigned long i, low, high, mid;
unsigned long symbol_end = 0;
const struct virtual_region *region;
namebuf[KSYM_NAME_LEN] = 0;
namebuf[0] = 0;
region = find_text_region(addr);
if (!region)
return NULL;
if (region->symbols_lookup)
return region->symbols_lookup(addr, symbolsize, offset, namebuf);
/* do a binary search on the sorted symbols_addresses array */
low = 0;
high = symbols_num_syms;
while (high-low > 1) {
mid = (low + high) / 2;
if (symbols_address(mid) <= addr) low = mid;
else high = mid;
}
/* search for the first aliased symbol. Aliased symbols are
symbols with the same address */
while (low && symbols_address(low - 1) == symbols_address(low))
--low;
/* Grab name */
symbols_expand_symbol(get_symbol_offset(low), namebuf);
/* Search for next non-aliased symbol */
for (i = low + 1; i < symbols_num_syms; i++) {
if (symbols_address(i) > symbols_address(low)) {
symbol_end = symbols_address(i);
break;
}
}
/* if we found no next symbol, we use the end of the section */
if (!symbol_end)
symbol_end = is_kernel_inittext(addr) ?
(unsigned long)_einittext : (unsigned long)_etext;
*symbolsize = symbol_end - symbols_address(low);
*offset = addr - symbols_address(low);
return namebuf;
}
bool_t is_active_kernel_text(unsigned long addr)
{
return (is_kernel_text(addr) ||
(system_state < SYS_STATE_active && is_kernel_inittext(addr)));
}
/* Boot-time pagetable setup.
* Changes here may need matching changes in head.S */
void __init setup_pagetables(unsigned long boot_phys_offset, paddr_t xen_paddr)
{
unsigned long dest_va;
lpae_t pte, *p;
int i;
/* Map the destination in the boot misc area. */
dest_va = BOOT_MISC_VIRT_START;
pte = mfn_to_xen_entry(xen_paddr >> PAGE_SHIFT);
write_pte(xen_second + second_table_offset(dest_va), pte);
flush_xen_data_tlb_range_va(dest_va, SECOND_SIZE);
/* Calculate virt-to-phys offset for the new location */
phys_offset = xen_paddr - (unsigned long) _start;
/* Copy */
memcpy((void *) dest_va, _start, _end - _start);
/* Beware! Any state we modify between now and the PT switch may be
* discarded when we switch over to the copy. */
/* Update the copy of xen_pgtable to use the new paddrs */
p = (void *) xen_pgtable + dest_va - (unsigned long) _start;
#ifdef CONFIG_ARM_64
p[0].pt.base += (phys_offset - boot_phys_offset) >> PAGE_SHIFT;
p = (void *) xen_first + dest_va - (unsigned long) _start;
#endif
for ( i = 0; i < 4; i++)
p[i].pt.base += (phys_offset - boot_phys_offset) >> PAGE_SHIFT;
p = (void *) xen_second + dest_va - (unsigned long) _start;
if ( boot_phys_offset != 0 )
{
/* Remove the old identity mapping of the boot paddr */
vaddr_t va = (vaddr_t)_start + boot_phys_offset;
p[second_linear_offset(va)].bits = 0;
}
for ( i = 0; i < 4 * LPAE_ENTRIES; i++)
if ( p[i].pt.valid )
p[i].pt.base += (phys_offset - boot_phys_offset) >> PAGE_SHIFT;
/* Change pagetables to the copy in the relocated Xen */
boot_ttbr = (uintptr_t) xen_pgtable + phys_offset;
flush_xen_dcache(boot_ttbr);
flush_xen_dcache_va_range((void*)dest_va, _end - _start);
flush_xen_text_tlb();
WRITE_SYSREG64(boot_ttbr, TTBR0_EL2);
dsb(); /* Ensure visibility of HTTBR update */
flush_xen_text_tlb();
/* Undo the temporary map */
pte.bits = 0;
write_pte(xen_second + second_table_offset(dest_va), pte);
flush_xen_text_tlb();
/* Link in the fixmap pagetable */
pte = mfn_to_xen_entry((((unsigned long) xen_fixmap) + phys_offset)
>> PAGE_SHIFT);
pte.pt.table = 1;
write_pte(xen_second + second_table_offset(FIXMAP_ADDR(0)), pte);
/*
* No flush required here. Individual flushes are done in
* set_fixmap as entries are used.
*/
/* Break up the Xen mapping into 4k pages and protect them separately. */
for ( i = 0; i < LPAE_ENTRIES; i++ )
{
unsigned long mfn = paddr_to_pfn(xen_paddr) + i;
unsigned long va = XEN_VIRT_START + (i << PAGE_SHIFT);
if ( !is_kernel(va) )
break;
pte = mfn_to_xen_entry(mfn);
pte.pt.table = 1; /* 4k mappings always have this bit set */
if ( is_kernel_text(va) || is_kernel_inittext(va) )
{
pte.pt.xn = 0;
pte.pt.ro = 1;
}
if ( is_kernel_rodata(va) )
pte.pt.ro = 1;
write_pte(xen_xenmap + i, pte);
/* No flush required here as page table is not hooked in yet. */
}
pte = mfn_to_xen_entry((((unsigned long) xen_xenmap) + phys_offset)
>> PAGE_SHIFT);
pte.pt.table = 1;
write_pte(xen_second + second_linear_offset(XEN_VIRT_START), pte);
/* TLBFLUSH and ISB would be needed here, but wait until we set WXN */
/* From now on, no mapping may be both writable and executable. */
WRITE_SYSREG32(READ_SYSREG32(SCTLR_EL2) | SCTLR_WXN, SCTLR_EL2);
/* Flush everything after setting WXN bit. */
flush_xen_text_tlb();
}
/**
* Lookup the symbol name corresponding to a kernel address
*/
const char *kallsyms_lookup(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset,
char *namebuf)
{
unsigned long i, low, high, mid;
/* This kernel should never had been booted. */
BUG_ON(!kallsyms_addresses);
namebuf[KSYM_NAME_LEN] = 0;
namebuf[0] = 0;
if ((all_var && is_kernel(addr)) ||
(!all_var && (is_kernel_text(addr) || is_kernel_inittext(addr) ||
is_kernel_extratext(addr)))) {
unsigned long symbol_end = 0;
/* do a binary search on the sorted kallsyms_addresses array */
low = 0;
high = kallsyms_num_syms;
while (high-low > 1) {
mid = (low + high) / 2;
if (kallsyms_addresses[mid] <= addr) low = mid;
else high = mid;
}
/* search for the first aliased symbol. Aliased symbols are
symbols with the same address */
while (low && kallsyms_addresses[low - 1] ==
kallsyms_addresses[low])
--low;
/* Grab name */
kallsyms_expand_symbol(get_symbol_offset(low), namebuf);
/* Search for next non-aliased symbol */
for (i = low + 1; i < kallsyms_num_syms; i++) {
if (kallsyms_addresses[i] > kallsyms_addresses[low]) {
symbol_end = kallsyms_addresses[i];
break;
}
}
/* if we found no next symbol, we use the end of the section */
if (!symbol_end) {
if (is_kernel_inittext(addr))
symbol_end = (unsigned long)_einittext;
else
symbol_end = (all_var) ? (unsigned long)_end
: (unsigned long)_etext;
}
if (symbolsize)
*symbolsize = symbol_end - kallsyms_addresses[low];
if (offset)
*offset = addr - kallsyms_addresses[low];
return namebuf;
}
return NULL;
}
