801 lines
30 KiB
C
801 lines
30 KiB
C
#include <utsm/dsk.h>
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#include <utsm/arena.h>
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#include <utsm/dkm.h>
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#include <utsm/log.h>
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#include <utsm/types.h>
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#include <utsm/pe.h>
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#include <utsm/linux_compat.h>
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#include <utsm/instr.h>
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#include "../arch/x86_64/limine.h"
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#include "../../tools/fat32_lfn.h"
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#define DSK_PATH "/system/deshab64/deshab.elf"
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#define DSK_CMDLINE "dsk:main"
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#define ELF_MAGIC0 0x7f
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#define ELF_MAGIC1 'E'
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#define ELF_MAGIC2 'L'
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#define ELF_MAGIC3 'F'
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#define ELFCLASS64 2
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#define ELFDATA2LSB 1
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#define ET_DYN 3
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#define ET_EXEC 2
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#define EM_X86_64 62
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#define PT_LOAD 1
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#define PT_DYNAMIC 2
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/* ELF Dynamic section tags */
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#define DT_NULL 0
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#define DT_RELA 7
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#define DT_RELASZ 8
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#define DT_RELAENT 9
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/* ELF Relocation types */
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#define R_X86_64_RELATIVE 8
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typedef struct elf64_dyn {
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i64 tag;
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u64 val;
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} elf64_dyn;
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typedef struct elf64_rela {
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u64 offset;
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u64 info;
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i64 addend;
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} elf64_rela;
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void *memset(void *dst, int value, usize len);
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void *memcpy(void *dst, const void *src, usize len);
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extern volatile struct limine_module_request g_module_request;
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extern volatile struct limine_rsdp_request g_rsdp_request;
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extern volatile struct limine_framebuffer_request g_fb_request;
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extern volatile struct limine_hhdm_request g_hhdm_request;
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typedef struct elf64_ehdr {
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u8 ident[16];
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u16 type;
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u16 machine;
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u32 version;
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u64 entry;
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u64 phoff;
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u64 shoff;
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u32 flags;
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u16 ehsize;
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u16 phentsize;
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u16 phnum;
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u16 shentsize;
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u16 shnum;
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u16 shstrndx;
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} elf64_ehdr;
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typedef struct elf64_phdr {
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u32 type;
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u32 flags;
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u64 offset;
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u64 vaddr;
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u64 paddr;
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u64 filesz;
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u64 memsz;
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u64 align;
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} elf64_phdr;
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/* ---- minimal FAT32 parser ---- */
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typedef struct __attribute__((packed)) {
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u8 jmp[3];
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char oem[8];
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u16 bytes_per_sector;
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u8 sectors_per_cluster;
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u16 reserved_sector_count;
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u8 fat_count;
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u16 root_entry_count;
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u16 total_sectors_16;
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u8 media;
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u16 sectors_per_fat_16;
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u16 sectors_per_track;
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u16 heads;
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u32 hidden_sectors;
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u32 total_sectors_32;
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u32 sectors_per_fat;
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u16 flags;
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u16 version;
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u32 root_cluster;
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u16 fsinfo_sector;
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u16 backup_boot;
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u8 reserved[12];
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u8 drive;
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u8 nt_flags;
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u8 signature;
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u32 serial;
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char label[11];
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char type[8];
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u8 code[420];
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u16 boot_sig;
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} fat32_bpb;
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typedef struct __attribute__((packed)) {
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char name[11];
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u8 attr;
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u8 nt_reserved;
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u8 creation_tenth;
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u16 creation_time;
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u16 creation_date;
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u16 access_date;
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u16 cluster_high;
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u16 write_time;
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u16 write_date;
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u16 cluster_low;
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u32 file_size;
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} fat32_dir_entry;
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static u32 fat32_read_u32(const u8 *p) {
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return (u32)p[0] | ((u32)p[1] << 8) | ((u32)p[2] << 16) | ((u32)p[3] << 24);
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}
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static u16 fat32_read_u16(const u8 *p) {
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return (u16)p[0] | ((u16)p[1] << 8);
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}
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static int fat32_name11_eq(const char *n, const char *s) {
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for (int i = 0; i < 11; i++) {
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if (n[i] != s[i]) return 0;
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}
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return 1;
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}
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/* core helpers reused from earlier loader */
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static int streq(const char *a, const char *b) {
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if (!a || !b) return 0;
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while (*a && *b) {
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if (*a != *b) return 0;
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a++;
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b++;
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}
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return *a == *b;
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}
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static int range_ok(u64 offset, u64 length, u64 size) {
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if (offset > size) return 0;
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if (length > size - offset) return 0;
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return 1;
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}
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static struct limine_file *dsk_find_module(void) {
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struct limine_module_response *rsp = g_module_request.response;
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if (!rsp) return 0;
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for (u64 i = 0; i < rsp->module_count; i++) {
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struct limine_file *file = rsp->modules[i];
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if (!file) continue;
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if (streq(file->path, DSK_PATH) || streq(file->cmdline, DSK_CMDLINE)) {
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return file;
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}
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}
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return 0;
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}
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/* ---- FAT32 block-provider file reader ---- */
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static u8 g_dsk_fat32_disk[131072]; /* 256-sector BPB+FAT+root dir buffer (与 DSK 端一致) */
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static u8 g_dsk_fat32_cluster[4096]; /* 8-sector cluster buffer */
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/* 实机要求: 文件缓冲区足够容纳 deshab.elf (~1.5MB) 及 SYSTEM/lib 下的
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* 大型 DLL（shell32.dll ~8MB, uiautomationcore.dll ~4.3MB） */
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static u8 g_dsk_fat32_filedata[10485760]; /* 10MB file data buffer */
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/* BUG-019 修复: FAT 按需扇区读取缓冲区（仅 512 字节），
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* 当 FAT 条目偏移超出 g_dsk_fat32_disk (128KB) 时使用。 */
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static u8 g_dsk_fat32_fat_sec[512];
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/* BUG-019 修复: 按需读取 FAT 扇区获取下一个簇号。
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* 如果目标 FAT 条目在预读缓冲区内，直接读取；
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* 否则只读取包含该条目的单个 FAT 扇区（512 字节）。
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* fat_start: FAT 在预读缓冲区中的字节偏移（reserved_sectors * 512）。
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* clus: 当前簇号。
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* bpb: BPB 指针（用于计算 FAT 扇区 LBA）。
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* disk: 预读缓冲区基址。
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* 返回: 下一个簇号，失败返回 0x0FFFFFFF（链终止）。 */
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static u32 fat32_get_next_cluster(u32 fat_start_byte, u32 clus,
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const fat32_bpb *bpb, const u8 *disk) {
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u32 fat_ent_off = fat_start_byte + clus * 4;
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/* 情况 1: FAT 条目在预读缓冲区内（小分区） */
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if (fat_ent_off + 4 <= sizeof(g_dsk_fat32_disk)) {
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return fat32_read_u32(disk + fat_ent_off) & 0x0FFFFFFF;
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}
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/* 情况 2: FAT 条目超出预读缓冲区（实机大分区）——按需读取单个 FAT 扇区 */
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const dkm_kernel_api *api = dkm_get_kernel_api();
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if (!api || !api->block) return 0x0FFFFFFF;
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/* FAT 条目在 FAT 表中的字节偏移（相对于 FAT 起始） */
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u32 fat_byte_off_in_fat = clus * 4;
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/* 该条目所在的 FAT 扇区号（相对于 FAT 起始） */
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u32 fat_sec_index = fat_byte_off_in_fat / 512;
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/* 条目在扇区内的字节偏移 */
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u32 ent_off_in_sec = fat_byte_off_in_fat % 512;
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/* FAT 扇区的绝对 LBA */
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u32 fat_sec_lba = bpb->reserved_sector_count + fat_sec_index;
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int st = api->block->read(0, fat_sec_lba, 1, g_dsk_fat32_fat_sec);
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if (st != 0) {
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log_error("[UTSM] FAT32: on-demand FAT sector read failed");
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log_hex64("[UTSM] FAT32: fat_sec_lba=", fat_sec_lba);
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log_hex64("[UTSM] FAT32: clus=", clus);
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return 0x0FFFFFFF;
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}
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return fat32_read_u32(g_dsk_fat32_fat_sec + ent_off_in_sec) & 0x0FFFFFFF;
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}
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static int dsk_load_from_block_fat32(const void **out_addr, u64 *out_size) {
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const dkm_kernel_api *api = dkm_get_kernel_api();
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if (!api || !api->block || !api->block->device_count) {
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log_error("[UTSM] FAT32: no block api available");
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return -1;
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}
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u32 count = api->block->device_count();
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if (count == 0 || api->block->sector_size(0) != 512) {
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log_error("[UTSM] FAT32: no block device or wrong sector size");
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log_hex64("[UTSM] FAT32: device_count=", count);
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return -1;
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}
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/* Read first 256 sectors: BPB + FAT + root dir */
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u8 *disk = g_dsk_fat32_disk;
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int st = api->block->read(0, 0, 256, disk);
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if (st != 0) {
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log_error("[UTSM] FAT32: BPB read failed");
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log_hex64("[UTSM] FAT32: read status=", (u64)(i64)st);
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return -1;
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}
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const fat32_bpb *bpb = (const fat32_bpb *)disk;
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if (bpb->boot_sig != 0xAA55 || bpb->bytes_per_sector != 512) {
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log_error("[UTSM] FAT32: invalid BPB signature or sector size");
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log_hex64("[UTSM] FAT32: boot_sig=", bpb->boot_sig);
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log_hex64("[UTSM] FAT32: bps=", bpb->bytes_per_sector);
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return -1;
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}
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u32 fat_start = bpb->reserved_sector_count * 512;
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u32 data_start_sec = bpb->reserved_sector_count + (u32)bpb->fat_count * bpb->sectors_per_fat;
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log_hex64("[UTSM] FAT32: fat_start_off=", fat_start);
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log_hex64("[UTSM] FAT32: data_start_sec=", data_start_sec);
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log_hex64("[UTSM] FAT32: spc=", bpb->sectors_per_cluster);
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log_hex64("[UTSM] FAT32: root_clus=", bpb->root_cluster);
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u32 clus = bpb->root_cluster;
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u32 found_clus = 0;
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u32 found_size = 0;
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const char *target = "DESHAB ELF";
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while (clus >= 2 && clus < 0x0FFFFFF8) {
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u32 clus_lba = data_start_sec + (clus - 2) * bpb->sectors_per_cluster;
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u32 cls_sec = bpb->sectors_per_cluster;
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u8 *cb = g_dsk_fat32_cluster;
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st = api->block->read(0, clus_lba, cls_sec, cb);
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if (st != 0) {
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log_error("[UTSM] FAT32: dir cluster read failed");
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log_hex64("[UTSM] FAT32: clus=", clus);
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log_hex64("[UTSM] FAT32: lba=", clus_lba);
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return -1;
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}
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const fat32_dir_entry *dir = (const fat32_dir_entry *)cb;
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for (u32 e = 0; e * 32 < cls_sec * 512; e++) {
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if (dir[e].name[0] == 0) break;
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if ((u8)dir[e].name[0] == 0xE5) continue;
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if (dir[e].attr == 0x0F) continue;
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if (dir[e].attr & 0x08) continue;
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if (fat32_name11_eq(dir[e].name, target)) {
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found_size = dir[e].file_size;
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found_clus = fat32_read_u16((const u8 *)&dir[e].cluster_low) |
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((u32)fat32_read_u16((const u8 *)&dir[e].cluster_high) << 16);
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break;
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}
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}
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if (found_clus) break;
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/* BUG-019: 使用按需 FAT 读取，不再受 128KB 缓冲区限制 */
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clus = fat32_get_next_cluster(fat_start, clus, bpb, disk);
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}
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if (!found_clus || found_size == 0) {
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log_error("[UTSM] FAT32: DESHAB.ELF not found in root dir");
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return -1;
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}
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log_hex64("[UTSM] FAT32: found_clus=", found_clus);
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log_hex64("[UTSM] FAT32: found_size=", found_size);
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if (found_size > sizeof(g_dsk_fat32_filedata)) {
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log_error("[UTSM] FAT32: file exceeds 2MB buffer");
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return -1;
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}
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u8 *dst = g_dsk_fat32_filedata;
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u32 remaining = found_size;
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u32 fc = found_clus;
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while (fc >= 2 && fc < 0x0FFFFFF8 && remaining > 0) {
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u32 fc_lba = data_start_sec + (fc - 2) * bpb->sectors_per_cluster;
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u32 fc_sec = bpb->sectors_per_cluster;
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u32 fc_bytes = fc_sec * 512;
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if (fc_bytes > remaining) fc_bytes = remaining;
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u8 *chunk = g_dsk_fat32_cluster;
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st = api->block->read(0, fc_lba, fc_sec, chunk);
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if (st != 0) {
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log_error("[UTSM] FAT32: data cluster read failed");
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log_hex64("[UTSM] FAT32: fc=", fc);
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log_hex64("[UTSM] FAT32: lba=", fc_lba);
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return -1;
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}
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for (u32 b = 0; b < fc_bytes; b++) dst[b] = chunk[b];
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dst += fc_bytes;
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remaining -= fc_bytes;
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/* BUG-019: 使用按需 FAT 读取 */
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fc = fat32_get_next_cluster(fat_start, fc, bpb, disk);
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}
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/* Copy to arena for ELF loader */
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u8 *file_buf = (u8 *)kmem_alloc_aligned(found_size, 16);
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if (!file_buf) {
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log_error("[UTSM] FAT32: arena alloc failed");
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log_hex64("[UTSM] FAT32: size=", found_size);
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return -1;
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}
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for (u32 i = 0; i < found_size; i++) file_buf[i] = g_dsk_fat32_filedata[i];
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*out_addr = file_buf;
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*out_size = found_size;
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log_hex64("[UTSM] FAT32 file size=", found_size);
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return 0;
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}
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/* ---- FAT32 subdirectory traversal ---- */
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/* 在指定起始 cluster 的目录项中查找 name11（8.3）或 long_name（LFN 长名）。
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* long_name 为 NULL 时仅按 8.3 匹配（向后兼容）。
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* is_dir=1 时只匹配子目录（attr & 0x10），is_dir=0 时只匹配文件。
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* 返回 0 成功，out_clus/out_size 返回匹配项的起始 cluster 和大小。
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* 注意：LFN 缓冲跨簇遍历持续存活，支持跨簇边界的 LFN 链。 */
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static int fat32_find_in_dir(u32 start_clus, const char *name11, int is_dir,
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u32 *out_clus, u32 *out_size, const char *long_name) {
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const dkm_kernel_api *api = dkm_get_kernel_api();
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if (!api || !api->block || !api->block->device_count) return -1;
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u8 *disk = g_dsk_fat32_disk;
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const fat32_bpb *bpb = (const fat32_bpb *)disk;
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if (bpb->boot_sig != 0xAA55 || bpb->bytes_per_sector != 512) return -2;
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u32 fat_start = bpb->reserved_sector_count * 512;
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u32 data_start_sec = bpb->reserved_sector_count + (u32)bpb->fat_count * bpb->sectors_per_fat;
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u32 spc = bpb->sectors_per_cluster;
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/* LFN 缓冲必须在簇循环外声明：跨簇 LFN 链需要持续存活 */
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fat32_lfn_buf lfn;
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fat32_lfn_init(&lfn);
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u32 clus = start_clus;
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while (clus >= 2 && clus < 0x0FFFFFF8) {
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u32 clus_lba = data_start_sec + (clus - 2) * spc;
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u8 *cb = g_dsk_fat32_cluster;
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int st = api->block->read(0, clus_lba, spc, cb);
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if (st != 0) return -3;
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const u8 *entries = (const u8 *)cb;
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u32 entry_count = (spc * 512) / 32;
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for (u32 e = 0; e < entry_count; e++) {
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const u8 *entry = entries + e * 32;
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if (entry[0] == 0) break;
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if ((u8)entry[0] == 0xE5) {
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fat32_lfn_init(&lfn);
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continue;
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}
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const fat32_dir_entry *de = (const fat32_dir_entry *)entry;
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int is_short = fat32_lfn_process(&lfn, entry);
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if (!is_short) continue; /* LFN 片段 */
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if (de->attr & 0x08) {
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fat32_lfn_init(&lfn);
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continue; /* 卷标 */
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}
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int entry_is_dir = (de->attr & 0x10) ? 1 : 0;
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if (entry_is_dir != is_dir) {
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fat32_lfn_init(&lfn);
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continue;
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}
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/* 匹配检查：先 8.3 短名，再 LFN 长名 */
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int matched = 0;
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if (name11 && fat32_name11_eq(de->name, name11)) {
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matched = 1;
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} else if (long_name) {
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if (lfn.valid) {
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char ascii[FAT32_LFN_MAX];
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int n = fat32_lfn_to_ascii(&lfn, ascii, sizeof(ascii));
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if (n >= 0 && fat32_lfn_streq_ci(ascii, long_name)) matched = 1;
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}
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if (!matched) {
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char short_disp[13];
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fat32_lfn_short_to_str((const u8 *)de->name, short_disp);
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if (fat32_lfn_streq_ci(short_disp, long_name)) matched = 1;
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}
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}
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if (matched) {
|
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*out_clus = fat32_read_u16((const u8 *)&de->cluster_low) |
|
||
((u32)fat32_read_u16((const u8 *)&de->cluster_high) << 16);
|
||
*out_size = de->file_size;
|
||
return 0;
|
||
}
|
||
fat32_lfn_init(&lfn);
|
||
}
|
||
|
||
/* 跟随 FAT 链 — BUG-019: 使用按需 FAT 读取 */
|
||
clus = fat32_get_next_cluster(fat_start, clus, bpb, disk);
|
||
}
|
||
return -4; /* 未找到 */
|
||
}
|
||
|
||
/* 按路径查找文件并读取内容。
|
||
* path: '/' 分隔的路径。支持两种格式：
|
||
* 1) 8.3 路径（如 "SYSTEM /DESHAB64 /FUCK "，每段恰好 11 字符）
|
||
* 2) 长名路径（如 "lib/libtest.so"）
|
||
* 同时保留 8.3 短名（补空格）和原始长名传给 fat32_find_in_dir。
|
||
* out_data: 返回在 g_dsk_fat32_filedata 中的文件数据指针。
|
||
* out_size: 返回文件大小。
|
||
* 返回 0 成功。 */
|
||
int fat32_read_path(const char *path, u8 **out_data, u32 *out_size) {
|
||
const dkm_kernel_api *api = dkm_get_kernel_api();
|
||
if (!api || !api->block || !api->block->device_count) return -1;
|
||
|
||
u8 *disk = g_dsk_fat32_disk;
|
||
/* 确保 BPB 缓冲区是新鲜的 */
|
||
if (api->block->read(0, 0, 256, disk) != 0) return -2;
|
||
|
||
const fat32_bpb *bpb = (const fat32_bpb *)disk;
|
||
if (bpb->boot_sig != 0xAA55 || bpb->bytes_per_sector != 512) return -3;
|
||
|
||
u32 fat_start = bpb->reserved_sector_count * 512;
|
||
u32 data_start_sec = bpb->reserved_sector_count + (u32)bpb->fat_count * bpb->sectors_per_fat;
|
||
u32 spc = bpb->sectors_per_cluster;
|
||
|
||
/* 解析路径组件 */
|
||
u32 pos = 0;
|
||
u32 path_len = 0;
|
||
while (path[path_len]) path_len++;
|
||
|
||
u32 cur_clus = bpb->root_cluster; /* 从根目录开始 */
|
||
|
||
while (pos < path_len) {
|
||
/* 提取一个路径组件（到下一个 '/' 或结尾），同时保留原始串用于 LFN 匹配 */
|
||
char comp[12]; /* 11 字符 8.3 名 + \0 */
|
||
char orig[260]; /* 原始长名 */
|
||
u32 ci = 0, oi = 0;
|
||
while (pos < path_len && path[pos] != '/') {
|
||
if (ci < 11) comp[ci++] = path[pos];
|
||
if (oi + 1 < sizeof(orig)) orig[oi++] = path[pos];
|
||
pos++;
|
||
}
|
||
/* 不足 11 字符则补空格 */
|
||
while (ci < 11) comp[ci++] = ' ';
|
||
comp[11] = 0;
|
||
orig[oi] = 0;
|
||
|
||
/* 跳过 '/' */
|
||
if (pos < path_len && path[pos] == '/') pos++;
|
||
|
||
/* 判断是否为最后一个组件 */
|
||
int is_last = (pos >= path_len);
|
||
|
||
if (is_last) {
|
||
/* 最后一级：查找文件 */
|
||
u32 found_clus = 0, found_size = 0;
|
||
int rc = fat32_find_in_dir(cur_clus, comp, 0, &found_clus, &found_size,
|
||
(oi > 0 && oi != 11) ? orig : 0);
|
||
if (rc != 0) return -4;
|
||
|
||
if (found_size > sizeof(g_dsk_fat32_filedata)) return -5;
|
||
|
||
/* 读取文件数据 */
|
||
u8 *dst = g_dsk_fat32_filedata;
|
||
u32 remaining = found_size;
|
||
u32 fc = found_clus;
|
||
while (fc >= 2 && fc < 0x0FFFFFF8 && remaining > 0) {
|
||
u32 fc_lba = data_start_sec + (fc - 2) * spc;
|
||
u32 fc_bytes = spc * 512;
|
||
if (fc_bytes > remaining) fc_bytes = remaining;
|
||
u8 *chunk = g_dsk_fat32_cluster;
|
||
if (api->block->read(0, fc_lba, spc, chunk) != 0) return -6;
|
||
for (u32 b = 0; b < fc_bytes; b++) dst[b] = chunk[b];
|
||
dst += fc_bytes;
|
||
remaining -= fc_bytes;
|
||
/* BUG-019: 使用按需 FAT 读取 */
|
||
fc = fat32_get_next_cluster(fat_start, fc, bpb, disk);
|
||
}
|
||
|
||
*out_data = g_dsk_fat32_filedata;
|
||
*out_size = found_size;
|
||
return 0;
|
||
} else {
|
||
/* 中间级：查找子目录 */
|
||
u32 sub_clus = 0, sub_size = 0;
|
||
int rc = fat32_find_in_dir(cur_clus, comp, 1, &sub_clus, &sub_size,
|
||
(oi > 0 && oi != 11) ? orig : 0);
|
||
if (rc != 0) return -7;
|
||
cur_clus = sub_clus;
|
||
}
|
||
}
|
||
|
||
return -8; /* 路径为空或无效 */
|
||
}
|
||
|
||
/* ---- ELF checks ---- */
|
||
static int dsk_check_elf(const void *address, u64 size) {
|
||
if (!address || size < sizeof(elf64_ehdr)) return -1;
|
||
const elf64_ehdr *eh = (const elf64_ehdr *)address;
|
||
if (eh->ident[0] != ELF_MAGIC0 || eh->ident[1] != ELF_MAGIC1 ||
|
||
eh->ident[2] != ELF_MAGIC2 || eh->ident[3] != ELF_MAGIC3) return -2;
|
||
if (eh->ident[4] != ELFCLASS64 || eh->ident[5] != ELFDATA2LSB) return -3;
|
||
if (eh->machine != EM_X86_64) return -4;
|
||
if (eh->type != ET_DYN && eh->type != ET_EXEC) return -5;
|
||
if (eh->phoff == 0 || eh->phnum == 0 || eh->phentsize < sizeof(elf64_phdr)) return -6;
|
||
if (!range_ok(eh->phoff, (u64)eh->phnum * eh->phentsize, size)) return -7;
|
||
return 0;
|
||
}
|
||
|
||
static int dsk_load_elf_image(const void *address, u64 size, dsk_entry_fn *entry_out) {
|
||
const elf64_ehdr *eh = (const elf64_ehdr *)address;
|
||
const u8 *base = (const u8 *)address;
|
||
|
||
u64 min_vaddr = ~0ULL;
|
||
u64 max_vaddr = 0;
|
||
u64 max_align = 0x1000;
|
||
u32 load_count = 0;
|
||
|
||
/* PT_DYNAMIC 的位置（PIE 重定位用） */
|
||
u64 dyn_off = 0;
|
||
u64 dyn_filesz = 0;
|
||
int has_dyn = 0;
|
||
|
||
for (u16 i = 0; i < eh->phnum; i++) {
|
||
const elf64_phdr *ph = (const elf64_phdr *)(base + eh->phoff + (u64)i * eh->phentsize);
|
||
if (ph->type == PT_LOAD) {
|
||
if (ph->filesz > ph->memsz) return -1;
|
||
if (!range_ok(ph->offset, ph->filesz, size)) return -2;
|
||
if (ph->vaddr < min_vaddr) min_vaddr = ph->vaddr;
|
||
if (ph->vaddr + ph->memsz > max_vaddr) max_vaddr = ph->vaddr + ph->memsz;
|
||
if (ph->align > max_align) max_align = ph->align;
|
||
load_count++;
|
||
} else if (ph->type == PT_DYNAMIC) {
|
||
if (!range_ok(ph->offset, ph->filesz, size)) return -2;
|
||
dyn_off = ph->offset;
|
||
dyn_filesz = ph->filesz;
|
||
has_dyn = 1;
|
||
}
|
||
}
|
||
|
||
if (load_count == 0 || min_vaddr == ~0ULL || max_vaddr <= min_vaddr) return -3;
|
||
if (eh->entry < min_vaddr || eh->entry >= max_vaddr) return -4;
|
||
|
||
u64 image_size = utsm_align_up_u64(max_vaddr - min_vaddr, 0x1000);
|
||
u8 *image = (u8 *)kmem_alloc_aligned(image_size, max_align);
|
||
if (!image) return -5;
|
||
memset(image, 0, image_size);
|
||
|
||
for (u16 i = 0; i < eh->phnum; i++) {
|
||
const elf64_phdr *ph = (const elf64_phdr *)(base + eh->phoff + (u64)i * eh->phentsize);
|
||
if (ph->type != PT_LOAD) continue;
|
||
u64 dst_off = ph->vaddr - min_vaddr;
|
||
if (dst_off + ph->memsz > image_size) return -6;
|
||
memcpy(image + dst_off, base + ph->offset, ph->filesz);
|
||
}
|
||
|
||
/* PIE 重定位: 处理 PT_DYNAMIC → DT_RELA → R_X86_64_RELATIVE
|
||
* load_bias = image 实际加载地址 - ELF 预期最小 vaddr
|
||
* 对每个 R_X86_64_RELATIVE: slot = load_bias + addend */
|
||
if (has_dyn && eh->type == ET_DYN) {
|
||
u64 load_bias = (u64)image - min_vaddr;
|
||
const elf64_dyn *dyn = (const elf64_dyn *)(base + dyn_off);
|
||
u64 dyn_count = dyn_filesz / sizeof(elf64_dyn);
|
||
|
||
u64 rela_off = 0, rela_sz = 0, rela_ent = sizeof(elf64_rela);
|
||
|
||
for (u64 d = 0; d < dyn_count; d++) {
|
||
if (dyn[d].tag == DT_NULL) break;
|
||
if (dyn[d].tag == DT_RELA) rela_off = dyn[d].val;
|
||
if (dyn[d].tag == DT_RELASZ) rela_sz = dyn[d].val;
|
||
if (dyn[d].tag == DT_RELAENT) rela_ent = dyn[d].val;
|
||
}
|
||
|
||
if (rela_off != 0 && rela_sz != 0 && rela_ent != 0) {
|
||
/* rela_off 是相对于文件开头的 vaddr，需转换为 image 内偏移 */
|
||
if (rela_off >= min_vaddr && rela_off < min_vaddr + image_size) {
|
||
u64 rela_count = rela_sz / rela_ent;
|
||
for (u64 r = 0; r < rela_count; r++) {
|
||
const elf64_rela *rel = (const elf64_rela *)(
|
||
image + (rela_off - min_vaddr) + r * rela_ent);
|
||
u32 rtype = (u32)rel->info;
|
||
if (rtype == R_X86_64_RELATIVE) {
|
||
if (rel->offset < min_vaddr || rel->offset >= min_vaddr + image_size) continue;
|
||
u64 *slot = (u64 *)(image + (rel->offset - min_vaddr));
|
||
*slot = load_bias + (u64)rel->addend;
|
||
}
|
||
}
|
||
}
|
||
log_info("[UTSM] PIE reloc applied");
|
||
log_hex64("[UTSM] load_bias=", load_bias);
|
||
log_hex64("[UTSM] rela_count=", rela_sz / rela_ent);
|
||
}
|
||
}
|
||
|
||
*entry_out = (dsk_entry_fn)(image + (eh->entry - min_vaddr));
|
||
log_hex64("[UTSM] DSK image base=", (u64)image);
|
||
log_hex64("[UTSM] DSK image size=", image_size);
|
||
log_hex64("[UTSM] DSK entry=", (u64)*entry_out);
|
||
return 0;
|
||
}
|
||
|
||
static void dsk_fill_boot_context(dsk_boot_context *ctx) {
|
||
memset(ctx, 0, sizeof(*ctx));
|
||
ctx->magic = DSK_BOOT_MAGIC;
|
||
ctx->abi_version = DSK_BOOT_ABI_VERSION;
|
||
ctx->size = sizeof(*ctx);
|
||
ctx->flags = DSK_BOOT_FLAG_FROM_UTSM | DSK_BOOT_FLAG_DKM_READY | DSK_BOOT_FLAG_FAT32_PATH;
|
||
|
||
if (g_hhdm_request.response) {
|
||
ctx->hhdm_offset = g_hhdm_request.response->offset;
|
||
}
|
||
if (g_rsdp_request.response) {
|
||
ctx->rsdp_address = (u64)g_rsdp_request.response->address;
|
||
}
|
||
if (g_fb_request.response && g_fb_request.response->framebuffer_count > 0) {
|
||
struct limine_framebuffer *fb = g_fb_request.response->framebuffers[0];
|
||
ctx->framebuffer_address = (u64)fb->address;
|
||
ctx->framebuffer_width = fb->width;
|
||
ctx->framebuffer_height = fb->height;
|
||
ctx->framebuffer_pitch = fb->pitch;
|
||
ctx->framebuffer_bpp = fb->bpp;
|
||
}
|
||
ctx->boot_modules_response = (u64)g_module_request.response;
|
||
ctx->dkm_kernel_api = (u64)dkm_get_kernel_api();
|
||
|
||
/* PE 兼容层服务（PE32+ 原生 + PE32 解释器） */
|
||
const pe_service *pe = pe_get_service();
|
||
if (pe && pe->magic == PE_SERVICE_MAGIC) {
|
||
ctx->reserved[4] = (u64)pe;
|
||
}
|
||
|
||
/* Linux 兼容层服务（依赖双内核 park-and-resume + IPC） */
|
||
const linux_compat_service *lxc = linux_compat_get_service();
|
||
if (lxc && lxc->magic == LINUX_COMPAT_MAGIC) {
|
||
ctx->reserved[5] = (u64)lxc;
|
||
}
|
||
|
||
/* Probe 探测缓冲信息（供 shell $probe 命令读取） */
|
||
if (g_instr_enabled) {
|
||
probe_info *pi = (probe_info *)kmem_alloc_aligned(sizeof(probe_info), 8);
|
||
if (pi) {
|
||
pi->magic = PROBE_INFO_MAGIC;
|
||
pi->version = 1;
|
||
pi->probe_buf_addr = (u64)probe_buf_address();
|
||
pi->probe_cap = probe_capacity();
|
||
pi->probe_head = probe_head_value();
|
||
pi->probe_count = probe_count();
|
||
pi->probe_dropped = probe_dropped_count();
|
||
pi->instr_enabled = g_instr_enabled;
|
||
pi->instr_probe_enable = g_instr_probe_enable;
|
||
ctx->reserved[6] = (u64)pi;
|
||
ctx->flags |= DSK_BOOT_FLAG_PROBE_INFO;
|
||
}
|
||
}
|
||
|
||
u64 rsp;
|
||
__asm__ volatile ("movq %%rsp, %0" : "=r"(rsp));
|
||
ctx->kernel_stack_top = rsp;
|
||
}
|
||
|
||
int dsk_load_and_jump(void) {
|
||
log_info("[UTSM] loading DSK");
|
||
log_info(DSK_PATH);
|
||
|
||
const void *data = 0;
|
||
u64 data_size = 0;
|
||
|
||
/* 1) try FAT32 block provider */
|
||
int fat32_ok = dsk_load_from_block_fat32(&data, &data_size);
|
||
if (fat32_ok == 0) {
|
||
log_info("[UTSM] DSK loaded from FAT32 block provider");
|
||
} else {
|
||
/* 2) fallback: Limine boot module */
|
||
log_info("[UTSM] FAT32 block path unavailable; trying Limine module");
|
||
struct limine_file *file = dsk_find_module();
|
||
if (!file) {
|
||
log_error("[UTSM] DSK module not found (neither FAT32 nor Limine)");
|
||
return -1;
|
||
}
|
||
data = file->address;
|
||
data_size = file->size;
|
||
log_hex64("[UTSM] DSK module size=", data_size);
|
||
}
|
||
|
||
int status = dsk_check_elf(data, data_size);
|
||
if (status != 0) {
|
||
log_error("[UTSM] DSK ELF rejected");
|
||
log_hex64("[UTSM] DSK ELF status=", (u64)(i64)status);
|
||
return status;
|
||
}
|
||
|
||
dsk_entry_fn entry = 0;
|
||
status = dsk_load_elf_image(data, data_size, &entry);
|
||
if (status != 0) {
|
||
log_error("[UTSM] DSK load failed");
|
||
log_hex64("[UTSM] DSK load status=", (u64)(i64)status);
|
||
return status;
|
||
}
|
||
|
||
dsk_boot_context *ctx = (dsk_boot_context *)kmem_alloc_aligned(sizeof(dsk_boot_context), 16);
|
||
if (!ctx) {
|
||
log_error("[UTSM] DSK context allocation failed");
|
||
return -1;
|
||
}
|
||
dsk_fill_boot_context(ctx);
|
||
|
||
/* 实机安全: 跳转前 cli → mask PIC → 重置 IDT → NMI off。
|
||
* DSK 加载的 ELF 映像可能覆盖 UTSM 的驱动代码段,
|
||
* 如果 UTSM 注册的 IRQ handler 所在内存被覆盖,
|
||
* 中断触发时跳转到无效地址 → 三重故障重启。
|
||
*
|
||
* P0 修复: 1) 先 cli 禁用中断，消除 PIC mask 两步操作之间的中断竞争窗口
|
||
* 2) mask PIC 确保不会有硬件中断到达
|
||
* 3) 设置 LAPIC TPR=0xFF 屏蔽所有通过 IOAPIC 路由的中断
|
||
* 4) 将 IDT 所有条目替换为安全 halt stub，防止 DSK 运行时
|
||
* 过期的 UTSM handler 被异常/spurious IRQ 触发
|
||
* 5) 禁用 NMI */
|
||
{
|
||
extern void outb(u16 port, u8 value);
|
||
extern u8 inb(u16 port);
|
||
|
||
/* 1) 先禁用中断——关键修复！原来缺少此步，
|
||
* outb(0xA1,0xFF) 和 outb(0x21,0xFF) 之间有中断窗口 */
|
||
__asm__ volatile("cli");
|
||
|
||
/* 2) mask PIC — 此时 IF=0，安全操作 */
|
||
outb(0xA1, 0xFF); /* PIC2: mask IRQ8-15 */
|
||
outb(0x21, 0xFF); /* PIC1: mask IRQ0-7 */
|
||
|
||
/* 3) BUG-020 修复: 设置 LAPIC TPR=0xFF 屏蔽所有 IOAPIC 路由中断。
|
||
* 实机多核平台中断通常经 IOAPIC 而非 PIC，PIC mask 不影响
|
||
* IOAPIC redirection entry。通过 IA32_APIC_BASE MSR 读取 LAPIC
|
||
* 基地址，写入 TPR（偏移 0x80）=0xFF 可在 LAPIC 层面屏蔽所有
|
||
* 可屏蔽中断（低于 0xFF 优先级），确保 DSK 运行期间不会有
|
||
* IOAPIC 路由的 IRQ 到达。HHDM 映射后 LAPIC MMIO 可访问。 */
|
||
{
|
||
u32 msr_lo, msr_hi;
|
||
__asm__ volatile("rdmsr" : "=a"(msr_lo), "=d"(msr_hi) : "c"(0x1B));
|
||
u64 lapic_phys = ((u64)msr_hi << 32) | (msr_lo & 0xFFFFF000ULL);
|
||
if (lapic_phys && (msr_lo & (1 << 11))) {
|
||
/* LAPIC 全局启用时（bit 11）才操作 TPR */
|
||
extern volatile struct limine_hhdm_request g_hhdm_request;
|
||
u64 hhdm_off = g_hhdm_request.response
|
||
? g_hhdm_request.response->offset : 0;
|
||
if (hhdm_off) {
|
||
u64 lapic_vaddr = lapic_phys + hhdm_off;
|
||
*(volatile u32 *)(lapic_vaddr + 0x80) = 0xFF;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 4) BUG-20260801-005: 换装 DSK 诊断 IDT（替代原静默 halt_all）。
|
||
* vector 0-31 → UTSM isr_stub（idt_handler 打完整异常现场后
|
||
* 安全停机），vector 32-255 保持 halt stub 防御 spurious IRQ7/15。
|
||
* SAS-R0 下 UTSM .text 常驻内存，DSK 阶段异常投递路径已验证
|
||
* 可用（BUG-20260729-013 登记行为）；原 halt_all 把 #PF/#GP
|
||
* 无声吞掉，DSK 阶段零诊断。 */
|
||
extern void idt_install_dsk_diag(void);
|
||
idt_install_dsk_diag();
|
||
|
||
/* 5) NMI off */
|
||
outb(0x70, inb(0x70) | 0x80);
|
||
}
|
||
|
||
log_hex64("[UTSM] DSK context magic=", ctx->magic);
|
||
log_hex64("[UTSM] DSK context api=", ctx->dkm_kernel_api);
|
||
log_hex64("[UTSM] DSK context fb=", ctx->framebuffer_address);
|
||
log_info("[UTSM] jumping to DSK");
|
||
entry(ctx);
|
||
|
||
log_error("[UTSM] DSK returned unexpectedly");
|
||
return -1;
|
||
}
|