mirror of
https://github.com/EnderIce2/Fennix.git
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140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/*
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This file is part of Fennix C Library.
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Fennix C Library is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix C Library. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <fennix/syscalls.h>
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// const char __interp[] __attribute__((section(".interp"))) = "/boot/fennix.elf";
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#ifndef LIBC_GIT_COMMIT
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#define LIBC_GIT_COMMIT "0000000000000000000000000000000000000000"
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#endif
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#define HEX_DIGIT(c) (((c) >= '0' && (c) <= '9') ? ((c) - '0') : ((c) - 'a' + 10))
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#define CONVERT_TO_BYTE(h, l) ((HEX_DIGIT(h) << 4) | HEX_DIGIT(l))
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#define HASH_BYTES(hex) \
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{CONVERT_TO_BYTE(hex[0], hex[1]), \
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CONVERT_TO_BYTE(hex[2], hex[3]), \
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CONVERT_TO_BYTE(hex[4], hex[5]), \
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CONVERT_TO_BYTE(hex[6], hex[7]), \
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CONVERT_TO_BYTE(hex[8], hex[9]), \
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CONVERT_TO_BYTE(hex[10], hex[11]), \
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CONVERT_TO_BYTE(hex[12], hex[13]), \
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CONVERT_TO_BYTE(hex[14], hex[15]), \
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CONVERT_TO_BYTE(hex[16], hex[17]), \
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CONVERT_TO_BYTE(hex[18], hex[19]), \
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CONVERT_TO_BYTE(hex[20], hex[21]), \
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CONVERT_TO_BYTE(hex[22], hex[23]), \
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CONVERT_TO_BYTE(hex[24], hex[25]), \
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CONVERT_TO_BYTE(hex[26], hex[27]), \
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CONVERT_TO_BYTE(hex[28], hex[29]), \
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CONVERT_TO_BYTE(hex[30], hex[31]), \
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CONVERT_TO_BYTE(hex[32], hex[33]), \
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CONVERT_TO_BYTE(hex[34], hex[35]), \
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CONVERT_TO_BYTE(hex[36], hex[37]), \
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CONVERT_TO_BYTE(hex[38], hex[39])}
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/* These are declared in GNU ld */
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enum
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{
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NT_FNX_ABI_TAG = 1,
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NT_FNX_VERSION = 2,
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NT_FNX_BUILD_ID = 3,
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NT_FNX_ARCH = 4
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};
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typedef struct Elf_Nhdr
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{
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__UINT32_TYPE__ n_namesz;
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__UINT32_TYPE__ n_descsz;
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__UINT32_TYPE__ n_type;
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char n_name[];
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} __attribute__((packed)) Elf_Nhdr;
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const struct
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{
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Elf_Nhdr header;
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char name[4];
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__UINT32_TYPE__ desc[4];
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} __abi_tag __attribute__((aligned(4), section(".note.ABI-tag"))) = {
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.header = {
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.n_namesz = 4, /* "FNX" + '\0' */
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.n_descsz = sizeof(__UINT32_TYPE__) * 4, /* Description Size */
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.n_type = NT_FNX_ABI_TAG, /* Type */
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},
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.name = "FNX",
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.desc = {0, 0, 0, 0},
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};
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const struct
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{
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Elf_Nhdr header;
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char name[4];
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__UINT8_TYPE__ desc[20];
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} __build_id __attribute__((aligned(4), section(".note.build-id"))) = {
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.header = {
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.n_namesz = 4, /* "FNX" + '\0' */
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.n_descsz = sizeof(__UINT8_TYPE__) * 20, /* Description Size */
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.n_type = NT_FNX_BUILD_ID, /* Type */
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},
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.name = "FNX",
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.desc = HASH_BYTES(LIBC_GIT_COMMIT),
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};
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void __init_print_buffer();
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void __fini_print_buffer();
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__attribute__((naked, used, no_stack_protector)) void _start()
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{
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__asm__(
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"xorq %rbp, %rbp\n" /* Clear rbp */
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"push %rdi\n"
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"push %rsi\n"
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"push %rdx\n"
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"push %rcx\n"
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"push %r8\n"
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"push %r9\n"
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"call __init_print_buffer\n" /* Call __init_print_buffer */
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"call _dl_preload\n" /* Call _dl_preload */
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"movl %eax, %edi\n" /* Move return value to edi */
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"cmp $0, %edi\n" /* Check if return value is 0 */
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"jne _exit\n" /* If not, jump to _exit */
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"pop %r9\n"
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"pop %r8\n"
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"pop %rcx\n"
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"pop %rdx\n"
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"pop %rsi\n"
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"pop %rdi\n"
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"call main\n" /* Call _dl_main */
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"movl %eax, %edi\n" /* Move return value to edi */
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"call _exit\n"); /* Call _exit */
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}
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__attribute__((no_stack_protector)) _Noreturn void _exit(int status)
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{
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__fini_print_buffer();
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call_exit(status);
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/* At this point, the program *SHOULD* have exited. */
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__asm__("ud2\n");
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__builtin_unreachable();
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}
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__attribute__((no_stack_protector)) _Noreturn void _Exit(int status) { _exit(status); }
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