From a9a5c9f830eb1c44812bb7b3e3270cac9ff3d04f Mon Sep 17 00:00:00 2001
From: Aaron Kaiser <a_kaiser@posteo.de>
Date: Thu, 4 Apr 2024 17:00:02 +0200
Subject: [PATCH] Add syscalls

---
 Makefile                 |   7 +-
 syscall/Makefile         |   3 +
 syscall/jasmin_syscall.c | 145 +++++++++++++++++++++++++++++++++++++++
 syscall/jasmin_syscall.h |  20 ++++++
 syscall/jasmin_syscall.o | Bin 0 -> 3144 bytes
 5 files changed, 173 insertions(+), 2 deletions(-)
 create mode 100644 syscall/Makefile
 create mode 100644 syscall/jasmin_syscall.c
 create mode 100644 syscall/jasmin_syscall.h
 create mode 100644 syscall/jasmin_syscall.o

diff --git a/Makefile b/Makefile
index 7d9a786..ed2498a 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,8 @@ all: build
 build: build/agent.o
 	ar -crs build/libagent.a build/agent.o
 
-build/%.o: build/%.S
-	$(CC) $< -c -o $@
+build/%.o: build/%.S syscall/jasmin_syscall.o
+	$(CC) $< syscall/jasmin_syscall.o -c -o $@
 
 clean:
 	rm build/* 2> /dev/null || true
@@ -21,3 +21,6 @@ $(JC):
 
 build/%.S: src/%.jazz $(JC)
 	JASMINPATH="Jade=libjade/src/" $(JC) $< -o $@
+
+syscall/jasmin_syscall.o: syscall/jasmin_syscall.c syscall/jasmin_syscall.h
+	$(MAKE) -C syscall
diff --git a/syscall/Makefile b/syscall/Makefile
new file mode 100644
index 0000000..e985027
--- /dev/null
+++ b/syscall/Makefile
@@ -0,0 +1,3 @@
+all: jasmin_syscall.o 
+
+jasmin_syscall.o: jasmin_syscall.c jasmin_syscall.h 
diff --git a/syscall/jasmin_syscall.c b/syscall/jasmin_syscall.c
new file mode 100644
index 0000000..7da50ea
--- /dev/null
+++ b/syscall/jasmin_syscall.c
@@ -0,0 +1,145 @@
+
+#include "jasmin_syscall.h"
+
+#if defined(__linux__) 
+
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/random.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <linux/futex.h>
+#include <errno.h>
+#include <stdlib.h>
+
+
+
+uint8_t* __jasmin_syscall_randombytes__(uint8_t* _x, uint64_t xlen)
+{
+  int i;
+  uint8_t* x = _x;
+
+  printf("%lx:\n", x);
+
+  for (i = 0; i < xlen; i++)
+  {
+    printf("%02X", _x[i]);
+  }
+  printf("\n");
+
+
+  return _x;
+}
+
+// uint64_t __jasmin_syscall_open__(uint8_t* x, uint64_t xlen)
+// {
+//   uint8_t filename[xlen + 1];
+//   memcpy(filename, x, xlen);
+//   filename[xlen] = 0;
+//
+//   return (uint64_t)open(filename, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
+// }
+//
+// uint8_t __jasmin_syscall_close__(uint64_t fd)
+// {
+//   int success = close(fd);
+//
+//   if (success == 0) {
+//     return 1;
+//   } else {
+//     return 0;
+//   }
+// }
+
+uint64_t __jasmin_syscall_open__(uint8_t* x, uint64_t xlen)
+{
+  uint8_t* mem = (uint8_t*)mmap(NULL, 1024, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0);
+  if (mem == NULL) {
+    puts("mem error");
+    exit(1);
+  }
+  uintptr_t addr = (uintptr_t)(mem - 4096);
+  void* futex_mem = mmap((void*)addr, 1024, PROT_READ|PROT_WRITE, MAP_SHARED, 4, 0);
+  if ((uintptr_t)futex_mem != addr) {
+    puts("mem error 2");
+    exit(1);
+  }
+
+  return (uint64_t)mem;
+}
+
+// uint8_t* __jasmin_syscall_write__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+// {
+//   size_t i;
+//   uint8_t* x = _x;
+//
+//   while (xlen > 0) {
+//     i = write(fd, x, xlen);
+//     if (i < 1) {
+//       continue;
+//     }
+//     x += i;
+//     xlen -= i;
+//   }
+//
+//   return _x;
+// }
+
+uint8_t* __jasmin_syscall_read__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+{
+  uint32_t* addr = (uint32_t*)(uintptr_t)(fd - 4096);
+  long ret = syscall(SYS_futex, addr, FUTEX_WAIT, 0x1, NULL, NULL, 0);
+  if (ret == -1) {
+    printf("%d\n", errno);
+    perror("futex");
+  }
+
+  return _x;
+}
+
+uint8_t* __jasmin_syscall_write__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+{
+  uint32_t* addr = (uint32_t*)(uintptr_t)(fd - 4096);
+  *addr = 1;
+  syscall(SYS_futex, addr, FUTEX_WAKE, 1, NULL, NULL, 0);
+
+  return _x;
+}
+
+// uint8_t* __jasmin_syscall_read__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+// {
+//   size_t i;
+//   uint8_t* x = _x;
+//
+//   i = read(fd, x, xlen);
+//   if (i < 1) {
+//     // Do something
+//     perror("Something went wrong while reading the file");
+//   }
+//   x += i;
+//   xlen -= i;
+//
+//   memset(x, 0, xlen);
+//
+//   return _x;
+// }
+
+#endif
+
+#if defined(__APPLE__)
+
+#include <stdlib.h>
+
+#if !(defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200)
+#error "macOS version not supported (>= 10.12)"
+#endif
+
+uint8_t* __jasmin_syscall_randombytes__(uint8_t* x, uint64_t xlen){
+  arc4random_buf(x, xlen);
+  return x;
+}
+
+#endif
diff --git a/syscall/jasmin_syscall.h b/syscall/jasmin_syscall.h
new file mode 100644
index 0000000..7391622
--- /dev/null
+++ b/syscall/jasmin_syscall.h
@@ -0,0 +1,20 @@
+#include <stdint.h>
+#ifndef JASMIN_SYSCALL
+#define JASMIN_SYSCALL
+/* FIXME this need xlen to be Uptr */
+uint8_t* __jasmin_syscall_randombytes__(uint8_t* x, uint64_t xlen)
+asm("__jasmin_syscall_randombytes__");
+
+uint64_t __jasmin_syscall_open__(uint8_t* x, uint64_t xlen)
+asm("__jasmin_syscall_open__");
+
+uint8_t __jasmin_syscall_close__(uint64_t fd)
+asm("__jasmin_syscall_close__");
+
+uint8_t* __jasmin_syscall_write__(uint8_t* x, uint64_t xlen, uint64_t fd)
+asm("__jasmin_syscall_write__");
+
+uint8_t* __jasmin_syscall_read__(uint8_t* x, uint64_t xlen, uint64_t fd)
+asm("__jasmin_syscall_read__");
+
+#endif
diff --git a/syscall/jasmin_syscall.o b/syscall/jasmin_syscall.o
new file mode 100644
index 0000000000000000000000000000000000000000..ef6829ffb14b809bcc051dc9cb89b036cdb07736
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