forked from Minki/linux
33def8498f
Use a more generic form for __section that requires quotes to avoid complications with clang and gcc differences. Remove the quote operator # from compiler_attributes.h __section macro. Convert all unquoted __section(foo) uses to quoted __section("foo"). Also convert __attribute__((section("foo"))) uses to __section("foo") even if the __attribute__ has multiple list entry forms. Conversion done using the script at: https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.pl Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Nick Desaulniers <ndesaulniers@gooogle.com> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
185 lines
5.6 KiB
C
185 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/string.h>
|
|
#include <linux/elf.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/kexec.h>
|
|
#include <asm/sclp.h>
|
|
#include <asm/diag.h>
|
|
#include <asm/uv.h>
|
|
#include "compressed/decompressor.h"
|
|
#include "boot.h"
|
|
|
|
extern char __boot_data_start[], __boot_data_end[];
|
|
extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
|
|
unsigned long __bootdata_preserved(__kaslr_offset);
|
|
|
|
/*
|
|
* Some code and data needs to stay below 2 GB, even when the kernel would be
|
|
* relocated above 2 GB, because it has to use 31 bit addresses.
|
|
* Such code and data is part of the .dma section, and its location is passed
|
|
* over to the decompressed / relocated kernel via the .boot.preserved.data
|
|
* section.
|
|
*/
|
|
extern char _sdma[], _edma[];
|
|
extern char _stext_dma[], _etext_dma[];
|
|
extern struct exception_table_entry _start_dma_ex_table[];
|
|
extern struct exception_table_entry _stop_dma_ex_table[];
|
|
unsigned long __bootdata_preserved(__sdma) = __pa(&_sdma);
|
|
unsigned long __bootdata_preserved(__edma) = __pa(&_edma);
|
|
unsigned long __bootdata_preserved(__stext_dma) = __pa(&_stext_dma);
|
|
unsigned long __bootdata_preserved(__etext_dma) = __pa(&_etext_dma);
|
|
struct exception_table_entry *
|
|
__bootdata_preserved(__start_dma_ex_table) = _start_dma_ex_table;
|
|
struct exception_table_entry *
|
|
__bootdata_preserved(__stop_dma_ex_table) = _stop_dma_ex_table;
|
|
|
|
int _diag210_dma(struct diag210 *addr);
|
|
int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode);
|
|
int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode);
|
|
void _diag0c_dma(struct hypfs_diag0c_entry *entry);
|
|
void _diag308_reset_dma(void);
|
|
struct diag_ops __bootdata_preserved(diag_dma_ops) = {
|
|
.diag210 = _diag210_dma,
|
|
.diag26c = _diag26c_dma,
|
|
.diag14 = _diag14_dma,
|
|
.diag0c = _diag0c_dma,
|
|
.diag308_reset = _diag308_reset_dma
|
|
};
|
|
static struct diag210 _diag210_tmp_dma __section(".dma.data");
|
|
struct diag210 *__bootdata_preserved(__diag210_tmp_dma) = &_diag210_tmp_dma;
|
|
|
|
void error(char *x)
|
|
{
|
|
sclp_early_printk("\n\n");
|
|
sclp_early_printk(x);
|
|
sclp_early_printk("\n\n -- System halted");
|
|
|
|
disabled_wait();
|
|
}
|
|
|
|
#ifdef CONFIG_KERNEL_UNCOMPRESSED
|
|
unsigned long mem_safe_offset(void)
|
|
{
|
|
return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size;
|
|
}
|
|
#endif
|
|
|
|
static void rescue_initrd(unsigned long addr)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
|
|
return;
|
|
if (!INITRD_START || !INITRD_SIZE)
|
|
return;
|
|
if (addr <= INITRD_START)
|
|
return;
|
|
memmove((void *)addr, (void *)INITRD_START, INITRD_SIZE);
|
|
INITRD_START = addr;
|
|
}
|
|
|
|
static void copy_bootdata(void)
|
|
{
|
|
if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size)
|
|
error(".boot.data section size mismatch");
|
|
memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size);
|
|
if (__boot_data_preserved_end - __boot_data_preserved_start != vmlinux.bootdata_preserved_size)
|
|
error(".boot.preserved.data section size mismatch");
|
|
memcpy((void *)vmlinux.bootdata_preserved_off, __boot_data_preserved_start, vmlinux.bootdata_preserved_size);
|
|
}
|
|
|
|
static void handle_relocs(unsigned long offset)
|
|
{
|
|
Elf64_Rela *rela_start, *rela_end, *rela;
|
|
int r_type, r_sym, rc;
|
|
Elf64_Addr loc, val;
|
|
Elf64_Sym *dynsym;
|
|
|
|
rela_start = (Elf64_Rela *) vmlinux.rela_dyn_start;
|
|
rela_end = (Elf64_Rela *) vmlinux.rela_dyn_end;
|
|
dynsym = (Elf64_Sym *) vmlinux.dynsym_start;
|
|
for (rela = rela_start; rela < rela_end; rela++) {
|
|
loc = rela->r_offset + offset;
|
|
val = rela->r_addend;
|
|
r_sym = ELF64_R_SYM(rela->r_info);
|
|
if (r_sym) {
|
|
if (dynsym[r_sym].st_shndx != SHN_UNDEF)
|
|
val += dynsym[r_sym].st_value + offset;
|
|
} else {
|
|
/*
|
|
* 0 == undefined symbol table index (STN_UNDEF),
|
|
* used for R_390_RELATIVE, only add KASLR offset
|
|
*/
|
|
val += offset;
|
|
}
|
|
r_type = ELF64_R_TYPE(rela->r_info);
|
|
rc = arch_kexec_do_relocs(r_type, (void *) loc, val, 0);
|
|
if (rc)
|
|
error("Unknown relocation type");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function clears the BSS section of the decompressed Linux kernel and NOT the decompressor's.
|
|
*/
|
|
static void clear_bss_section(void)
|
|
{
|
|
memset((void *)vmlinux.default_lma + vmlinux.image_size, 0, vmlinux.bss_size);
|
|
}
|
|
|
|
void startup_kernel(void)
|
|
{
|
|
unsigned long random_lma;
|
|
unsigned long safe_addr;
|
|
void *img;
|
|
|
|
store_ipl_parmblock();
|
|
safe_addr = mem_safe_offset();
|
|
safe_addr = read_ipl_report(safe_addr);
|
|
uv_query_info();
|
|
rescue_initrd(safe_addr);
|
|
sclp_early_read_info();
|
|
setup_boot_command_line();
|
|
parse_boot_command_line();
|
|
setup_memory_end();
|
|
detect_memory();
|
|
|
|
random_lma = __kaslr_offset = 0;
|
|
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled) {
|
|
random_lma = get_random_base(safe_addr);
|
|
if (random_lma) {
|
|
__kaslr_offset = random_lma - vmlinux.default_lma;
|
|
img = (void *)vmlinux.default_lma;
|
|
vmlinux.default_lma += __kaslr_offset;
|
|
vmlinux.entry += __kaslr_offset;
|
|
vmlinux.bootdata_off += __kaslr_offset;
|
|
vmlinux.bootdata_preserved_off += __kaslr_offset;
|
|
vmlinux.rela_dyn_start += __kaslr_offset;
|
|
vmlinux.rela_dyn_end += __kaslr_offset;
|
|
vmlinux.dynsym_start += __kaslr_offset;
|
|
}
|
|
}
|
|
|
|
if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
|
|
img = decompress_kernel();
|
|
memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
|
|
} else if (__kaslr_offset)
|
|
memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size);
|
|
|
|
clear_bss_section();
|
|
copy_bootdata();
|
|
if (IS_ENABLED(CONFIG_RELOCATABLE))
|
|
handle_relocs(__kaslr_offset);
|
|
|
|
if (__kaslr_offset) {
|
|
/*
|
|
* Save KASLR offset for early dumps, before vmcore_info is set.
|
|
* Mark as uneven to distinguish from real vmcore_info pointer.
|
|
*/
|
|
S390_lowcore.vmcore_info = __kaslr_offset | 0x1UL;
|
|
/* Clear non-relocated kernel */
|
|
if (IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED))
|
|
memset(img, 0, vmlinux.image_size);
|
|
}
|
|
vmlinux.entry();
|
|
}
|