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240 lines
7.9 KiB
C
240 lines
7.9 KiB
C
/*
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* crt_x86_64.c
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*
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* Copyright (C) 2021 bzt (bztsrc@gitlab)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* This file is part of the POSIX-UEFI package.
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* @brief C runtime, bootstraps an EFI application to call standard main()
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*
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*/
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#include <uefi.h>
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/* this is implemented by the application */
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extern int main(int argc, char_t **argv);
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/* definitions for elf relocations */
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typedef uint64_t Elf64_Xword;
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typedef int64_t Elf64_Sxword;
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typedef uint64_t Elf64_Addr;
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typedef struct
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{
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Elf64_Sxword d_tag; /* Dynamic entry type */
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union
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{
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Elf64_Xword d_val; /* Integer value */
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Elf64_Addr d_ptr; /* Address value */
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} d_un;
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} Elf64_Dyn;
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#define DT_NULL 0 /* Marks end of dynamic section */
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#define DT_RELA 7 /* Address of Rela relocs */
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#define DT_RELASZ 8 /* Total size of Rela relocs */
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#define DT_RELAENT 9 /* Size of one Rela reloc */
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typedef struct
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{
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Elf64_Addr r_offset; /* Address */
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Elf64_Xword r_info; /* Relocation type and symbol index */
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} Elf64_Rel;
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#define ELF64_R_TYPE(i) ((i) & 0xffffffff)
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#define R_X86_64_RELATIVE 8 /* Adjust by program base */
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/* globals to store system table pointers */
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efi_handle_t IM = NULL;
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efi_system_table_t *ST = NULL;
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efi_boot_services_t *BS = NULL;
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efi_runtime_services_t *RT = NULL;
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efi_loaded_image_protocol_t *LIP = NULL;
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#ifndef UEFI_NO_UTF8
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char *__argvutf8 = NULL;
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#endif
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/* we only need one .o file, so use inline Assembly here */
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void bootstrap(void)
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{
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__asm__ __volatile__ (
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/* call init in C */
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" .align 4\n"
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#ifndef __clang__
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" .globl _start\n"
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"_start:\n"
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" lea ImageBase(%rip), %rdi\n"
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" lea _DYNAMIC(%rip), %rsi\n"
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" call uefi_init\n"
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" ret\n"
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/* fake a relocation record, so that EFI won't complain */
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" .data\n"
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"dummy: .long 0\n"
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" .section .reloc, \"a\"\n"
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"label1:\n"
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" .long dummy-label1\n"
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" .long 10\n"
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" .word 0\n"
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".text\n"
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#else
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" .globl __chkstk\n"
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"__chkstk:\n"
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" ret\n"
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#endif
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);
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/* setjmp and longjmp */
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__asm__ __volatile__ (
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" .globl setjmp\n"
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"setjmp:\n"
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" pop %rsi\n"
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" movq %rbx,0x00(%rdi)\n"
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" movq %rsp,0x08(%rdi)\n"
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" push %rsi\n"
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" movq %rbp,0x10(%rdi)\n"
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" movq %r12,0x18(%rdi)\n"
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" movq %r13,0x20(%rdi)\n"
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" movq %r14,0x28(%rdi)\n"
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" movq %r15,0x30(%rdi)\n"
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" movq %rsi,0x38(%rdi)\n"
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" xor %rax,%rax\n"
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" ret\n"
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);
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__asm__ __volatile__ (
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" .globl longjmp\n"
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"longjmp:\n"
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" movl %esi, %eax\n"
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" movq 0x00(%rdi), %rbx\n"
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" movq 0x08(%rdi), %rsp\n"
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" movq 0x10(%rdi), %rbp\n"
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" movq 0x18(%rdi), %r12\n"
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" movq 0x20(%rdi), %r13\n"
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" movq 0x28(%rdi), %r14\n"
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" movq 0x30(%rdi), %r15\n"
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" xor %rdx,%rdx\n"
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" mov $1,%rcx\n"
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" cmp %rax,%rdx\n"
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" cmove %rcx,%rax\n"
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" jmp *0x38(%rdi)\n"
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);
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}
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/**
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* Initialize POSIX-UEFI and call the application's main() function
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*/
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efi_status_t uefi_init (
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#ifndef __clang__
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uintptr_t ldbase, Elf64_Dyn *dyn, efi_system_table_t *systab, efi_handle_t image
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#else
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efi_handle_t image, efi_system_table_t *systab
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#endif
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) {
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efi_guid_t shpGuid = EFI_SHELL_PARAMETERS_PROTOCOL_GUID;
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efi_shell_parameters_protocol_t *shp = NULL;
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efi_guid_t shiGuid = SHELL_INTERFACE_PROTOCOL_GUID;
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efi_shell_interface_protocol_t *shi = NULL;
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efi_guid_t lipGuid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
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efi_status_t status;
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int argc = 0, i, ret;
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wchar_t **argv = NULL;
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#ifndef UEFI_NO_UTF8
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int j;
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char *s;
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#endif
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#ifndef __clang__
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long relsz = 0, relent = 0;
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Elf64_Rel *rel = 0;
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uintptr_t *addr;
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/* handle relocations */
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for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
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switch (dyn[i].d_tag) {
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case DT_RELA: rel = (Elf64_Rel*)((unsigned long)dyn[i].d_un.d_ptr + ldbase); break;
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case DT_RELASZ: relsz = dyn[i].d_un.d_val; break;
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case DT_RELAENT: relent = dyn[i].d_un.d_val; break;
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default: break;
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}
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}
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if (rel && relent) {
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while (relsz > 0) {
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if(ELF64_R_TYPE (rel->r_info) == R_X86_64_RELATIVE)
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{ addr = (unsigned long *)(ldbase + rel->r_offset); *addr += ldbase; }
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rel = (Elf64_Rel*) ((char *) rel + relent);
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relsz -= relent;
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}
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}
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#else
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(void)i;
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#endif
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/* make sure SSE is enabled, because some say there are buggy firmware in the wild not doing that */
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__asm__ __volatile__ (
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" movq %cr0, %rax\n"
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" andb $0xF1, %al\n"
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" movq %rax, %cr0\n"
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" movq %cr4, %rax\n"
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" orw $3 << 9, %ax\n"
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" mov %rax, %cr4\n"
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);
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/* failsafes, should never happen */
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if(!image || !systab || !systab->BootServices || !systab->BootServices->HandleProtocol ||
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!systab->BootServices->OpenProtocol || !systab->BootServices->AllocatePool || !systab->BootServices->FreePool)
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return EFI_UNSUPPORTED;
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/* save EFI pointers and loaded image into globals */
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IM = image;
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ST = systab;
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BS = systab->BootServices;
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RT = systab->RuntimeServices;
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BS->HandleProtocol(image, &lipGuid, (void **)&LIP);
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/* get command line arguments */
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status = BS->OpenProtocol(image, &shpGuid, (void **)&shp, image, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if(!EFI_ERROR(status) && shp) { argc = shp->Argc; argv = shp->Argv; }
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else {
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/* if shell 2.0 failed, fallback to shell 1.0 interface */
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status = BS->OpenProtocol(image, &shiGuid, (void **)&shi, image, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if(!EFI_ERROR(status) && shi) { argc = shi->Argc; argv = shi->Argv; }
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}
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/* call main */
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#ifndef UEFI_NO_UTF8
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if(argc && argv) {
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ret = (argc + 1) * (sizeof(uintptr_t) + 1);
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for(i = 0; i < argc; i++)
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for(j = 0; argv[i] && argv[i][j]; j++)
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ret += argv[i][j] < 0x80 ? 1 : (argv[i][j] < 0x800 ? 2 : 3);
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status = BS->AllocatePool(LIP ? LIP->ImageDataType : EfiLoaderData, ret, (void **)&__argvutf8);
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if(EFI_ERROR(status) || !__argvutf8) { argc = 0; __argvutf8 = NULL; }
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else {
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s = __argvutf8 + argc * sizeof(uintptr_t);
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*((uintptr_t*)s) = (uintptr_t)0; s += sizeof(uintptr_t);
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for(i = 0; i < argc; i++) {
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*((uintptr_t*)(__argvutf8 + i * sizeof(uintptr_t))) = (uintptr_t)s;
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for(j = 0; argv[i] && argv[i][j]; j++) {
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if(argv[i][j]<0x80) { *s++ = argv[i][j]; } else
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if(argv[i][j]<0x800) { *s++ = ((argv[i][j]>>6)&0x1F)|0xC0; *s++ = (argv[i][j]&0x3F)|0x80; } else
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{ *s++ = ((argv[i][j]>>12)&0x0F)|0xE0; *s++ = ((argv[i][j]>>6)&0x3F)|0x80; *s++ = (argv[i][j]&0x3F)|0x80; }
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}
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*s++ = 0;
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}
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}
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}
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ret = main(argc, (char**)__argvutf8);
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if(__argvutf8) BS->FreePool(__argvutf8);
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#else
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ret = main(argc, argv);
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#endif
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return ret ? EFIERR(ret) : EFI_SUCCESS;
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}
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