mirror of https://github.com/flysand7/ciabatta.git
Start on dynamic loader
This commit is contained in:
flysand7
parent
8751a697ee
commit
c293fc7813
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@ -0,0 +1,14 @@
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#!/bin/bash
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nasm \
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-f elf64 \
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-o bin/loader-entry.o \
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src/loader/loader-entry.asm
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clang -static -shared \
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-nostdlib \
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-ffreestanding \
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-I src/include \
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-o lib/ld.so \
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-Wl,-e,_dlstart \
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bin/loader-entry.o src/loader/loader.c
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10
build.py
10
build.py
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@ -75,6 +75,7 @@ cc_defines = []
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cc_flags = ['-nostdlib']
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crt_file = 'crt.lib'
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lib_file = 'cia.lib'
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dl_file = 'ld-cia.so'
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if args.mode == 'release':
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cc_flags.append('-O2')
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cc_defines.append('NDEBUG')
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@ -263,6 +264,13 @@ if not os.path.exists('bin'):
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cia_lib = f'lib/{lib_file}'
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crt_lib = f'lib/{crt_file}'
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dl_lib = f'lib/{dl_file}'
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if target == 'linux':
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print_step(f'Compiling {dl_lib}\n')
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assemble('src/loader/loader-entry.asm', 'bin/loader-entry.o')
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compile(['bin/loader-entry.o', 'src/loader/loader-entry.c'], dl_lib,
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'-shared -nostdlib -Wl,-e,_dlstart -Wl,--sort-section,alignment -Wl,--sort-common -Wl,--gc-sections -Wl,--hash-style=both -Wl,--no-undefined -Wl,--exclude-libs=ALL -fno-stack-protector')
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print_step(f'Compiling {crt_file}\n')
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if target == 'linux':
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@ -280,6 +288,6 @@ archive(['bin/ciabatta.o'], cia_lib)
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if args.test:
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if target == 'linux':
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compile([args.test, crt_lib, cia_lib], 'a', '-pie')
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compile([args.test, crt_lib, cia_lib], 'a', f'-pie -Wl,-dynamic-linker,{dl_lib}')
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elif target == 'windows':
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compile([args.test, crt_lib, cia_lib], 'a.exe', '-lkernel32.lib')
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@ -0,0 +1,13 @@
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bits 64
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section .text
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default rel
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global _dlstart
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extern _dlstart_c
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_dlstart:
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xor rbp, rbp
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mov rdi, rsp
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lea rsi, [_dlstart_c wrt ..plt]
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and rsp, -15
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@ -0,0 +1,84 @@
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#include <cia-def.h>
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#include "syscall.c"
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// void *memset(void *dst, int value, u64 num) {
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// u8 *bytes = dst;
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// for(int i = 0; i != num; ++i) {
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// bytes[i] = value;
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// }
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// return dst;
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// }
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static void write_char(char c) {
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_syscall_write(STDOUT_FILENO, &c, 1);
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}
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static void write_string(char *str) {
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int str_len = 0;
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while(str[str_len] != 0) {
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str_len += 1;
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}
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_syscall_write(STDOUT_FILENO, str, str_len);
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}
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static void write_int(i64 number) {
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if(number < 0) {
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write_char('-');
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number = -number;
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}
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char buf[20];
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buf[19] = 0;
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char *p = buf + sizeof buf - 1;
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do {
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*--p = (number%10) + '0';
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number /= 10;
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} while(number > 0);
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write_string(p);
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}
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static void write_uint(u64 number) {
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char buf[20];
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buf[19] = 0;
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char *p = buf + sizeof buf - 1;
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do {
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*--p = (number%10) + '0';
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number /= 10;
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} while(number > 0);
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write_string(p);
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}
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static void write_hex(u64 number) {
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write_string("0x");
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char digits[] = "0123456789abcdef";
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char buf[20];
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buf[19] = 0;
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char *p = buf + sizeof buf - 1;
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for(int i = 0; i < 64; i += 4) {
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if(i != 0 && i % 16 == 0) {
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*--p = '\'';
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}
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u8 bits = (number >> i) & 0x0f;
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char digit = digits[bits];
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*--p = digit;
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}
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write_string(p);
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}
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void _dlstart_c(u64 *sp, void *dynv) {
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write_string("Entered dynamic loader\n");
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int argc = *sp;
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char **argv = (void *)(sp+1);
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write_string("We're gonna load an executable: ");
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write_string(argv[0]);
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write_string("\n");
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write_string("With parameters: ");
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for(int i = 1; i < argc; ++i) {
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if(i != 1) {
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write_string(", ");
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}
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write_string(argv[i]);
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}
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write_string("\n");
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_syscall_exit(0);
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}
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@ -0,0 +1,197 @@
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#include <asm/unistd.h>
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#include <asm/signal.h>
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#include <asm/ioctls.h>
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#include <asm/mman.h>
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#include <linux/fs.h>
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#include <linux/loop.h>
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#include <linux/time.h>
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#include <errno.h>
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#if !defined(STDIN_FILENO)
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#define STDIN_FILENO 0
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#define STDOUT_FILENO 1
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#define STDERR_FILENO 2
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#endif
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#if !defined(MAP_SHARED)
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#define MAP_SHARED 0x01
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#define MAP_PRIVATE 0x02
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#define MAP_SHARED_VALIDATE 0x03
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#endif
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#if !defined(MAP_FAILED)
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#define MAP_FAILED ((void *)-1)
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#endif
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// NOTE(bumbread): These are architecture-specific
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#if !defined(O_RDONLY)
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#define O_RDONLY 0
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#define O_WRONLY 1
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#define O_RDWR 2
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#define O_CREAT 0x40
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#define O_EXCL 0x80
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#define O_NOCTTY 0x100
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#define O_TRUNC 0x200
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#define O_APPEND 0x400
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#define O_NONBLOCK 0x800
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#define O_DIRECTORY 0x10000
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#endif
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#define _SYSCALL_read 0
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#define _SYSCALL_write 1
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#define _SYSCALL_open 2
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#define _SYSCALL_close 3
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#define _SYSCALL_stat 4
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#define _SYSCALL_fstat 5
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#define _SYSCALL_lstat 6
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#define _SYSCALL_poll 7
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#define _SYSCALL_lseek 8
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#define _SYSCALL_mmap 9
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#define _SYSCALL_mprotect 10
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#define _SYSCALL_munmap 11
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#define _SYSCALL_brk 12
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#define _SYSCALL_rt_sigaction 13
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#define _SYSCALL_rt_sigprocmask 14
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#define _SYSCALL_rt_sigreturn 15
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#define _SYSCALL_ioctl 16
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#define _SYSCALL_pread64 17
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#define _SYSCALL_pwrite64 18
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#define _SYSCALL_readv 19
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#define _SYSCALL_writev 20
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#define _SYSCALL_access 21
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#define _SYSCALL_pipe 22
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#define _SYSCALL_select 23
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#define _SYSCALL_sched_yield 24
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#define _SYSCALL_mremap 25
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#define _SYSCALL_msync 26
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#define _SYSCALL_mincore 27
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#define _SYSCALL_madvise 28
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#define _SYSCALL_shmget 29
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#define _SYSCALL_shmat 30
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#define _SYSCALL_shmctl 31
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#define _SYSCALL_dup 32
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#define _SYSCALL_dup2 33
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#define _SYSCALL_pause 34
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#define _SYSCALL_nanosleep 35
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#define _SYSCALL_getitimer 36
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#define _SYSCALL_alarm 37
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#define _SYSCALL_setitimer 38
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#define _SYSCALL_getpid 39
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#define _SYSCALL_sendfile 40
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#define _SYSCALL_socket 41
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#define _SYSCALL_connect 42
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#define _SYSCALL_accept 43
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#define _SYSCALL_sendto 44
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#define _SYSCALL_recvfrom 45
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#define _SYSCALL_sendmsg 46
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#define _SYSCALL_recvmsg 47
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#define _SYSCALL_shutdown 48
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#define _SYSCALL_bind 49
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#define _SYSCALL_listen 50
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#define _SYSCALL_getsockname 51
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#define _SYSCALL_getpeername 52
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#define _SYSCALL_socketpair 53
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#define _SYSCALL_setsockopt 54
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#define _SYSCALL_getsockopt 55
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#define _SYSCALL_clone 56
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#define _SYSCALL_fork 57
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#define _SYSCALL_vfork 58
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#define _SYSCALL_execve 59
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#define _SYSCALL_exit 60
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#define _SYSCALL_arch_prctl 158
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// Syscall stubs
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static inline i64 _syscall0(i64 n) {
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i64 ret;
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asm volatile("syscall" : "=a"(ret) : "a"(n) : "rcx", "r11", "memory");
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return ret;
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}
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static inline i64 _syscall1(i64 n, i64 a1) {
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i64 ret;
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asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1) : "rcx", "r11", "memory");
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return ret;
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}
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static inline i64 _syscall2(i64 n, i64 a1, i64 a2) {
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i64 ret;
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asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2)
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: "rcx", "r11", "memory");
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return ret;
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}
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static inline i64 _syscall3(i64 n, i64 a1, i64 a2, i64 a3) {
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i64 ret;
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asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2),
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"d"(a3) : "rcx", "r11", "memory");
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return ret;
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}
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static inline i64 _syscall4(i64 n, i64 a1, i64 a2, i64 a3, i64 a4) {
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i64 ret;
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register i64 r10 asm("r10") = a4;
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asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2),
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"d"(a3), "r"(r10): "rcx", "r11", "memory");
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return ret;
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}
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static inline i64 _syscall5(i64 n, i64 a1, i64 a2, i64 a3, i64 a4, i64 a5) {
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i64 ret;
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register i64 r10 asm("r10") = a4;
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register i64 r8 asm("r8") = a5;
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asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2),
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"d"(a3), "r"(r10), "r"(r8) : "rcx", "r11", "memory");
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return ret;
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}
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static inline i64 _syscall6(i64 n, i64 a1, i64 a2, i64 a3, i64 a4, i64 a5, i64 a6) {
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i64 ret;
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register i64 r10 asm("r10") = a4;
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register i64 r8 asm("r8") = a5;
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register i64 r9 asm("r9") = a6;
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asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2),
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"d"(a3), "r"(r10), "r"(r8), "r"(r9) : "rcx", "r11", "memory");
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return ret;
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}
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// Syscall wrappers
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static inline i64 _syscall_read(u32 fd, char *buf, u64 count) {
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return _syscall3(_SYSCALL_read, (i64)fd, (i64)buf, (i64)count);
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}
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static inline i64 _syscall_write(u32 fd, char const *buf, u64 count) {
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return _syscall3(_SYSCALL_write, (i64)fd, (i64)buf, (u64)count);
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}
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static inline i64 _syscall_open(char const *filename, int flags, int mode) {
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return _syscall3(_SYSCALL_open, (i64)filename, (i64)flags, (i64)mode);
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}
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static inline i64 _syscall_close(u32 fd) {
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return _syscall1(_SYSCALL_close, fd);
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}
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static inline void *_syscall_mmap(u64 addr, u64 len, u64 prot, u64 flags, u64 fd, u64 offset) {
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return (void *)_syscall6(_SYSCALL_mmap, addr, len, prot, flags, fd, offset);
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}
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static inline i64 _syscall_munmap(void *addr, u64 len) {
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return _syscall2(_SYSCALL_munmap, (u64)addr, len);
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}
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_Noreturn static inline void _syscall_exit(int code) {
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_syscall1(_SYSCALL_exit, (i64)code);
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__builtin_unreachable();
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}
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static inline i64 _syscall_arch_prctl_set(int code, u64 value) {
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return _syscall2(_SYSCALL_arch_prctl, code, (i64)value);
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}
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static inline i64 _syscall_arch_prctl_get(int code, u64 *value) {
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return _syscall2(_SYSCALL_arch_prctl, code, (i64)value);
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}
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