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Rewrite relocation stuff

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This commit is contained in:
TuxSH 2018-03-02 02:19:35 +01:00
parent 6903b20579
commit 63d0b08ac4
7 changed files with 122 additions and 126 deletions
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42
exosphere/linker.ld
View file

@ -40,25 +40,6 @@ SECTIONS
. = ALIGN(64);
} >fake AT>fake
.warm_crt0 :
{
. = ALIGN(64);
__warmboot_crt0_lma__ = LOADADDR(.warm_crt0);
__warmboot_crt0_start__ = ABSOLUTE(.);
KEEP (*(.warm_crt0.text.start)) /* Should be first */
KEEP (*(.warm_crt0.text*))
KEEP (build/warmboot_init.o(.text*))
*(.warm_crt0.rodata*)
build/warmboot_init.o(.rodata*)
*(.warm_crt0.data*)
build/warmboot_init.o(.data*)
. = ALIGN(8);
*(.warm_crt0.bss*)
build/warmboot_init.o(.bss*)
. = ALIGN(64);
__warmboot_crt0_end__ = ABSOLUTE(.);
} >warmboot_crt0 AT>fake
.pk2ldr :
{
. = ALIGN(4096);
@ -89,6 +70,25 @@ SECTIONS
__vectors_end__ = ABSOLUTE(.);
} >evt AT>fake
.warm_crt0 :
{
. = ALIGN(64);
__warmboot_crt0_lma__ = LOADADDR(.warm_crt0);
__warmboot_crt0_start__ = ABSOLUTE(.);
KEEP (*(.warm_crt0.text.start)) /* Should be first */
KEEP (*(.warm_crt0.text*))
KEEP (build/warmboot_init.o(.text*))
*(.warm_crt0.rodata*)
build/warmboot_init.o(.rodata*)
*(.warm_crt0.data*)
build/warmboot_init.o(.data*)
. = ALIGN(8);
*(.warm_crt0.bss*)
build/warmboot_init.o(.bss*)
. = ALIGN(64);
__warmboot_crt0_end__ = ABSOLUTE(.);
} >warmboot_crt0 AT>fake
.text :
{
. = ALIGN(256);
@ -208,13 +208,13 @@ SECTIONS
.bss :
{
. = ALIGN(8);
__main_bss_start__ = ABSOLUTE(.);
__main_bss_start__ = ABSOLUTE(.);
__loaded_end_lma__ = LOADADDR(.bss);
*(.dynbss)
*(.bss .bss.* .gnu.linkonce.b.*)
*(COMMON)
. = ALIGN(8);
__main_end__ = ABSOLUTE(.);
__end_lma__ = LOADADDR(.bss) + __main_end__ - __main_bss_start__;
} >main AT>fake
__end__ = ABSOLUTE(.) ;

86
exosphere/src/coldboot_init.c
View file

@ -6,13 +6,6 @@
extern const uint8_t __start_cold[];
extern const uint8_t __warmboot_crt0_start__[], __warmboot_crt0_end__[];
extern const uint8_t __main_start__[], __main_bss_start__[], __main_end__[];
extern const uint8_t __pk2ldr_start__[], __pk2ldr_bss_start__[], __pk2ldr_end__[];
extern const uint8_t __vectors_start__[], __vectors_end__[];
extern const size_t __warmboot_crt0_offset, __main_offset, __pk2ldr_offset, __vectors_offset;
/* warmboot_init.c */
void set_memory_registers_enable_mmu(void);
@ -100,68 +93,57 @@ static void configure_ttbls(void) {
tzram_map_all_segments(mmu_l3_tbl);
}
__attribute__((noinline)) static void copy_lma_to_vma(const void *vma, size_t offset, size_t size) {
uint64_t *p_vma = (uint64_t *)vma;
const uint64_t *p_lma = (const uint64_t *)(__start_cold + offset);
for (size_t i = 0; i < size / 8; i++) {
p_vma[i] = p_lma[i];
static void translate_warmboot_func_list(coldboot_crt0_reloc_list_t *reloc_list) {
coldboot_crt0_reloc_t *warmboot_crt0_reloc = &reloc_list->relocs[0];
coldboot_crt0_reloc_t *main_reloc = &reloc_list->relocs[reloc_list->nb_relocs_pre_mmu_init];
/* The main segment immediately follows the warmboot crt0 in TZRAM, in the same page. */
uintptr_t main_pa = (uintptr_t)warmboot_crt0_reloc->vma | ((uintptr_t)main_reloc->vma & ~0xFFF);
for(size_t i = 0; i < reloc_list->func_list->nb_funcs; i++) {
if(reloc_list->func_list->addrs[i] >= 0x1F0000000ull) {
reloc_list->func_list->addrs[i] = main_pa + reloc_list->func_list->addrs[i] - (uintptr_t)main_reloc->vma;
}
}
}
FAR_REACHING static void copy_warmboot_crt0(void) {
copy_lma_to_vma(__warmboot_crt0_start__, __warmboot_crt0_offset, __warmboot_crt0_end__ - __warmboot_crt0_start__);
}
static void do_relocation(const coldboot_crt0_reloc_list_t *reloc_list, size_t index) {
uint64_t *p_vma = (uint64_t *)reloc_list->relocs[index].vma;
const uint64_t *p_lma = (const uint64_t *)(reloc_list->reloc_base + reloc_list->relocs[index].reloc_offset);
size_t size = reloc_list->relocs[index].end_vma - reloc_list->relocs[index].vma;
FAR_REACHING static void copy_other_sections(void) {
copy_lma_to_vma(__main_start__, __main_offset, __main_end__ - __main_start__);
copy_lma_to_vma(__pk2ldr_start__, __pk2ldr_offset, __pk2ldr_end__ - __pk2ldr_start__);
copy_lma_to_vma(__vectors_start__, __vectors_offset, __vectors_end__ - __vectors_start__);
}
FAR_REACHING static void set_memory_registers_enable_mmu_tzram_pa(void) {
volatile uintptr_t v = (uintptr_t)set_memory_registers_enable_mmu;
((void (*)(void))v)();
}
FAR_REACHING static void flush_dcache_all_tzram_pa(void) {
uintptr_t pa = TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_WARMBOOT_CRT0_AND_MAIN);
uintptr_t main_pa = pa | ((uintptr_t)__main_start__ & 0xFFF);
uintptr_t v = (uintptr_t)flush_dcache_all - (uintptr_t)__main_start__ + (uintptr_t)main_pa;
((void (*)(void))v)();
}
FAR_REACHING static void invalidate_icache_all_tzram_pa(void) {
uintptr_t pa = TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_WARMBOOT_CRT0_AND_MAIN);
uintptr_t main_pa = pa | ((uintptr_t)__main_start__ & 0xFFF);
uintptr_t v = (uintptr_t)invalidate_icache_all - (uintptr_t)__main_start__ + (uintptr_t)main_pa;
((void (*)(void))v)();
}
FAR_REACHING static void clear_bss(void) {
volatile uintptr_t v = (uintptr_t)memset;
((void (*)(void *, int, size_t))v)((void *)__pk2ldr_bss_start__, 0, __pk2ldr_end__ - __pk2ldr_bss_start__);
((void (*)(void *, int, size_t))v)((void *)__main_bss_start__, 0, __main_end__ - __main_bss_start__);
for(size_t i = 0; i < size / 8; i++) {
p_vma[i] = reloc_list->relocs[index].reloc_offset != 0 ? p_lma[i] : 0;
}
}
uintptr_t get_coldboot_crt0_stack_address(void) {
return TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_CORE3_STACK) + 0x800;
}
void coldboot_init(void) {
void coldboot_init(coldboot_crt0_reloc_list_t *reloc_list) {
/* Custom approach */
reloc_list->reloc_base = (uintptr_t)__start_cold;
/* TODO: Set NX BOOTLOADER clock time field */
copy_warmboot_crt0();
/* This at least copies .warm_crt0 to its VMA. */
for(size_t i = 0; i < reloc_list->nb_relocs_pre_mmu_init; i++) {
do_relocation(reloc_list, i);
}
/* At this point, we can (and will) access functions located in .warm_crt0 */
translate_warmboot_func_list(reloc_list);
/* TODO: initialize DMA controllers, etc. */
configure_ttbls();
set_memory_registers_enable_mmu_tzram_pa();
reloc_list->func_list->funcs.set_memory_registers_enable_mmu();
copy_other_sections();
/* Copy or clear the remaining sections */
for(size_t i = 0; i < reloc_list->nb_relocs_post_mmu_init; i++) {
do_relocation(reloc_list, reloc_list->nb_relocs_pre_mmu_init + i);
}
flush_dcache_all_tzram_pa();
invalidate_icache_all_tzram_pa();
reloc_list->func_list->funcs.flush_dcache_all();
reloc_list->func_list->funcs.invalidate_icache_all();
/* At this point we can access all the mapped segments (all other functions, data...) normally */
clear_bss();
}

4
exosphere/src/package2.c
View file

@ -372,7 +372,7 @@ uintptr_t get_pk2ldr_stack_address(void) {
/* This function is called during coldboot init, and validates a package2. */
/* This package2 is read into memory by a concurrent BPMP bootloader. */
void load_package2(void) {
void load_package2(coldboot_crt0_reloc_list_t *reloc_list) {
/* Setup the Security Engine. */
setup_se();
@ -393,7 +393,7 @@ void load_package2(void) {
randomcache_init();
/* memclear the initial copy of Exosphere running in IRAM (relocated to TZRAM by earlier code). */
memset(__start_cold_addr, 0, __bin_size);
memset((void *)reloc_list->reloc_base, 0, reloc_list->loaded_bin_size);
/* Let NX Bootloader know that we're running. */
MAILBOX_NX_BOOTLOADER_IS_SECMON_AWAKE = 1;

4
exosphere/src/package2.h
View file

@ -3,7 +3,7 @@
/* This is code responsible for validating a package2. Actual file reading is done by bootloader. */
#include <stdint.h>
#include "utils.h"
#include "bootconfig.h"
#include "memory_map.h"
@ -77,6 +77,6 @@ typedef struct {
} package2_header_t;
#pragma pack(pop)
void load_package2(void);
void load_package2(coldboot_crt0_reloc_list_t *reloc_list);
#endif

60
exosphere/src/start.s
View file

@ -80,11 +80,11 @@ __start_cold:
bl get_coldboot_crt0_stack_address
mov sp, x0
mov fp, #0
bl coldboot_init
adr x0, __start_cold
ldr x1, =__start_cold_addr
str x0, [x1]
adrp x19, g_coldboot_crt0_relocation_list
add x19, x19, #:lo12:g_coldboot_crt0_relocation_list
mov x0, x19
bl coldboot_init
ldr x16, =__jump_to_main_cold
br x16
@ -100,6 +100,9 @@ __start_warm:
bl get_warmboot_crt0_stack_address
mov sp, x0
mov fp, #0
adrp x0, g_warmboot_crt0_main_func_list
add x0, x0, #:lo12:g_warmboot_crt0_main_func_list
bl warmboot_init
ldr x16, =__jump_to_main_warm
br x16
@ -202,32 +205,29 @@ __jump_to_lower_el:
isb
eret
/* Custom stuff */
.align 3
.section .cold_crt0.rodata.reloc_constants, "a", %progbits
.global __warmboot_crt0_offset
__warmboot_crt0_offset:
.quad __warmboot_crt0_lma__
.global __main_offset
__main_offset:
.quad __main_lma__
.global __pk2ldr_offset
__pk2ldr_offset:
.quad __pk2ldr_lma__
.global __vectors_offset
__vectors_offset:
.quad __vectors_lma__
.section .cold_crt0.data.g_coldboot_crt0_relocation_list, "aw", %progbits
.global g_coldboot_crt0_relocation_list
g_coldboot_crt0_relocation_list:
.quad 0, __loaded_end_lma__ /* __start_cold, to be set & loaded size */
.quad 1, 5 /* number of sections to relocate/clear before & after mmu init */
.quad g_warmboot_crt0_main_func_list
/* Relocations */
.quad __warmboot_crt0_start__, __warmboot_crt0_end__, __warmboot_crt0_lma__
.quad __main_start__, __main_bss_start__, __main_lma__
.quad __pk2ldr_start__, __pk2ldr_bss_start__, __pk2ldr_lma__
.quad __vectors_start__, __vectors_end__, __vectors_lma__
/* BSS clears */
.quad __main_bss_start__, __main_end__, 0
.quad __pk2ldr_bss_start__, __pk2ldr_end__, 0
.align 3
.section .rodata.__bin_size, "a", %progbits
.global __bin_size
__bin_size:
.quad __end_lma__
.align 3
.section .bss.__start_cold_addr, "w", %nobits
.global __start_cold_addr
__start_cold_addr:
.space 8
.section .warm_crt0.data.g_warmboot_crt0_main_func_list, "aw", %progbits
.global g_warmboot_crt0_main_func_list
g_warmboot_crt0_main_func_list:
.quad 3 /* Number of functions */
/* Functions */
.quad set_memory_registers_enable_mmu
.quad flush_dcache_all
.quad invalidate_icache_all

31
exosphere/src/utils.h
View file

@ -18,6 +18,37 @@
#define ALINLINE __attribute__((always_inline))
#define FAR_REACHING __attribute__((target("cmodel=large"), noinline))
/* Custom stuff below */
/* For warmboot (and coldboot crt0) */
typedef struct {
size_t nb_funcs;
union {
struct {
void (*set_memory_registers_enable_mmu)(void);
void (*flush_dcache_all)(void);
void (*invalidate_icache_all)(void);
} funcs;
uintptr_t addrs[3];
};
} warmboot_func_list_t;
/* For coldboot */
typedef struct {
uint8_t *vma;
uint8_t *end_vma;
uintptr_t reloc_offset;
} coldboot_crt0_reloc_t;
typedef struct {
uintptr_t reloc_base;
size_t loaded_bin_size;
size_t nb_relocs_pre_mmu_init; /* first is always warmboot_crt0 */
size_t nb_relocs_post_mmu_init; /* first is always main segment excl. .bss */
warmboot_func_list_t *func_list;
coldboot_crt0_reloc_t relocs[];
} coldboot_crt0_reloc_list_t;
__attribute__ ((noreturn)) void panic(uint32_t code);
__attribute__ ((noreturn)) void generic_panic(void);
bool overlaps(uint64_t as, uint64_t ae, uint64_t bs, uint64_t be);

21
exosphere/src/warmboot_init.c
View file

@ -2,27 +2,10 @@
#include "memory_map.h"
#include "arm.h"
extern const uint8_t __main_start__[];
/* start.s */
void __set_memory_registers(uintptr_t ttbr0, uintptr_t vbar, uint64_t cpuectlr, uint32_t scr,
uint32_t tcr, uint32_t cptr, uint64_t mair, uint32_t sctlr);
/*
FAR_REACHING static void flush_dcache_all_tzram_pa(void) {
uintptr_t pa = TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_WARMBOOT_CRT0_AND_MAIN);
uintptr_t main_pa = pa | ((uintptr_t)__main_start__ & 0xFFF);
uintptr_t v = (uintptr_t)flush_dcache_all - (uintptr_t)__main_start__ + (uintptr_t)main_pa;
((void (*)(void))v)();
}
FAR_REACHING static void invalidate_icache_all_inner_shareable_tzram_pa(void) {
uintptr_t pa = TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_WARMBOOT_CRT0_AND_MAIN);
uintptr_t main_pa = pa | ((uintptr_t)__main_start__ & 0xFFF);
uintptr_t v = (uintptr_t)invalidate_icache_all_inner_shareable - (uintptr_t)__main_start__ + (uintptr_t)main_pa;
((void (*)(void))v)();
}*/
uintptr_t get_warmboot_crt0_stack_address(void) {
return TZRAM_GET_SEGMENT_PA(TZRAM_SEGMENT_ID_CORE012_STACK) + 0x800;
}
@ -80,6 +63,6 @@ void set_memory_registers_enable_mmu(void) {
__set_memory_registers(ttbr0, vbar, cpuectlr, scr, tcr, cptr, mair, sctlr);
}
void warmboot_init(void) {
/* TODO: Implement. */
void warmboot_init(warmboot_func_list_t *func_list) {
(void)func_list;
}