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UnicronNLandClaude Opus 5.5
4f042f7225
Interpreter + JIT for ARM, Thumb-2, VFPv4 and NEON, ARM EABI syscall translation, signals, threads and self-modifying code. Runs static bionic programs on the Frame. Tests: A64 encoders vs llvm-mc, a differential instruction fuzzer and program tests against qemu-arm. Not shipped; the README lists the steps towards running 32-bit-only APKs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/* JIT-in-the-guest: generates ARM and Thumb code at run time, runs it, rewrites it (cache maintenance via
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* __builtin___clear_cache = the cacheflush syscall), runs it again. Also a signal interrupting a tight loop. */
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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static volatile sig_atomic_t stop;
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static void on_alarm(int s) { (void)s; stop = 1; }
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typedef int (*fn_t)(int);
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int main(void)
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{
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uint32_t *code = mmap(NULL, 4096, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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int total = 0;
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for (int k = 0; k < 50; k++) {
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/* ARM: add r0, r0, #k ; bx lr */
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code[0] = 0xe2800000u | (uint32_t)k;
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code[1] = 0xe12fff1eu;
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__builtin___clear_cache((char *)code, (char *)(code + 2));
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total += ((fn_t)code)(1000);
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}
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printf("arm %d\n", total);
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/* the same buffer as Thumb code: movs r1, #k ; adds r0, r0, r1 ; bx lr */
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uint16_t *t = (uint16_t *)(code + 16);
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total = 0;
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for (int k = 0; k < 50; k++) {
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t[0] = (uint16_t)(0x2100 | k);
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t[1] = 0x1840;
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t[2] = 0x4770;
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__builtin___clear_cache((char *)t, (char *)(t + 3));
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total += ((fn_t)((uintptr_t)t | 1))(7);
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}
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printf("thumb %d\n", total);
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/* rewrite through mprotect (RW, write, RX) like JIT engines with W^X */
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mprotect(code, 4096, PROT_READ | PROT_WRITE);
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code[0] = 0xe3a00063u; /* mov r0, #99 */
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code[1] = 0xe12fff1eu;
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mprotect(code, 4096, PROT_READ | PROT_EXEC);
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printf("mprotect %d\n", ((fn_t)code)(0));
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/* a signal must stop a loop that never makes a syscall */
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signal(SIGALRM, on_alarm);
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struct itimerval it = {{0, 0}, {0, 50000}};
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setitimer(ITIMER_REAL, &it, NULL);
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unsigned long spins = 0;
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while (!stop) spins++;
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printf("loop stopped %d\n", spins > 0);
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return 0;
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}
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