/
container.c
79 lines (70 loc) · 2.26 KB
/
container.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef __APPLE__
#define TEXT_SECTION __attribute__((section("__TEXT,__text")))
#else
#define TEXT_SECTION __attribute__((section(".text#")))
#endif
#ifndef CODE_SIZE
#define CODE_SIZE 1000000
#endif
TEXT_SECTION volatile const char CODE_BYTES[CODE_SIZE] = "CODE_START";
void (*CODE)(void) = (void*)CODE_BYTES;
volatile void* DATA_TABLE[] = {
0, // argc // +0
0, // argv // +8
0, // envp // +16
0, // stdin // +24
0, // stdout // +32
0, // stderr // +40
// syscalls
read, // +48
write, // +56
fopen, // +64
fclose, // +72
exit, // +80
// libc
malloc, // +88
free, // +96
memset, // +104
memcpy, // +112
memmove, // +120
memcmp, // +128
strlen, // +136
strcpy, // +144
strcmp, // +152
puts, // +160
fputs, // +168
printf, // +176
fprintf, // +184
};
int main(int argc, char** argv, char** envp) {
DATA_TABLE[0] = (void*)(size_t)argc;
DATA_TABLE[1] = (void*)(size_t)argv;
DATA_TABLE[2] = (void*)(size_t)envp;
DATA_TABLE[3] = stdin;
DATA_TABLE[4] = stdout;
DATA_TABLE[5] = stderr;
#if defined(__x86_64__) || defined(_M_AMD64)
__asm__ __volatile__(
"movq %1,%%r15\n"
"call *%0\n"
: // output
: "g"(CODE), "X"(DATA_TABLE) // input
: "rax", "rbx", "rcx", "rdx", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
);
#elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
__asm__ __volatile__(
"mov x28, %1\n"
"blr %0\n"
: // output
: "r"(CODE), "X"(DATA_TABLE) // input
: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17", "x19", "x20", "x21", "x22", "x23", "x24", "x25", "x26", "x28", "cc", "memory"
);
#else
#error "Unsupported architecture"
#endif
}
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