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EnderIce2
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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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This file is part of Fennix Userspace.
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Fennix Userspace 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 Userspace 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 Userspace. If not, see <https://www.gnu.org/licenses/>.
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*/
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typedef void (*fct)(void);
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#define asm __asm__ __volatile__
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extern void (*__preinit_array_start[])(void) __attribute__((weak));
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extern void (*__preinit_array_end[])(void) __attribute__((weak));
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extern void (*__init_array_start[])(void) __attribute__((weak));
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extern void (*__init_array_end[])(void) __attribute__((weak));
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extern void (*__fini_array_start[])(void) __attribute__((weak));
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extern void (*__fini_array_end[])(void) __attribute__((weak));
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void __crt_init_array(void)
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{
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for (fct *func = __init_array_start; func != __init_array_end; func++)
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(*func)();
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}
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void __crt_fini_array(void)
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{
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for (fct *func = __fini_array_start; func != __fini_array_end; func++)
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(*func)();
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}
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__attribute__((naked, used, no_stack_protector, section(".text"))) void _start()
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{
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#if defined(__amd64__)
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asm("movq $0, %rbp\n"
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"pushq %rbp\n"
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"pushq %rbp\n"
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"movq %rsp, %rbp\n"
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"pushq %rcx\n"
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"pushq %rdx\n"
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"pushq %rsi\n"
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"pushq %rdi\n"
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"call __libc_init\n"
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"call __crt_init_array\n"
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"popq %rdi\n"
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"popq %rsi\n"
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"popq %rdx\n"
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"popq %rcx\n"
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"call main\n"
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"pushq %rax\n"
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"call __crt_fini_array\n"
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"popq %rax\n"
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"movl %eax, %edi\n"
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"call _exit\n");
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#elif defined(__i386__)
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#warning "i386 _start not implemented"
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#elif defined(__arm__)
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#warning "arm _start not implemented"
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#elif defined(__aarch64__)
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#warning "aarch64 _start not implemented"
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#else
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#error "Unsupported architecture"
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#endif
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}
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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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