Add hw3

Author: 5teven1in

Diff for: hw3/Makefile

@@ -0,0 +1,25 @@
+CC	= gcc
+ASM64	= yasm -f elf64 -DYASM -D__x86_64__ -DPIC
+
+CFLAGS	= -g -Wall -fno-stack-protector
+
+PROGS	= libmini.so
+
+all: $(PROGS)
+
+libmini.so: libmini64.asm libmini.c
+	$(ASM64) $< -o libmini64.o
+	$(CC) -c $(CFLAGS) -fPIC -nostdlib libmini.c
+	ld -shared libmini64.o libmini.o -o $@
+
+.PHONY: test clean
+
+test: start.asm test.c
+	$(ASM64) $< -o start.o
+	$(CC) -c $(CFLAGS) -nostdlib -I. -I.. -DUSEMINI test.c
+	ld -m elf_x86_64 --dynamic-linker /lib64/ld-linux-x86-64.so.2 -o test test.o start.o -L. -L.. -lmini
+	LD_LIBRARY_PATH=. ./test
+
+clean:
+	rm -f a.out test *.o $(PROGS) peda-*
+

Diff for: hw3/alarm1.c

@@ -0,0 +1,7 @@
+#include "libmini.h"
+int main() {
+    alarm(3);
+    pause();
+    return 0;
+}
+

Diff for: hw3/alarm2.c

@@ -0,0 +1,20 @@
+#include "libmini.h"
+
+int main() {
+    sigset_t s;
+    sigemptyset(&s);
+    sigaddset(&s, SIGALRM);
+    sigprocmask(SIG_BLOCK, &s, NULL);
+    alarm(3);
+    sleep(5);
+    if(sigpending(&s) < 0) perror("sigpending");
+    if(sigismember(&s, SIGALRM)) {
+            char m[] = "sigalrm is pending.\n";
+            write(1, m, sizeof(m));
+        } else {
+                char m[] = "sigalrm is not pending.\n";
+                write(1, m, sizeof(m));
+            }
+    return 0;
+}
+

Diff for: hw3/alarm3.c

@@ -0,0 +1,23 @@
+#include "libmini.h"
+
+void handler(int s) { /* do nothing */ }
+
+int main() {
+    sigset_t s;
+    sigemptyset(&s);
+    sigaddset(&s, SIGALRM);
+    sigprocmask(SIG_BLOCK, &s, NULL);
+    signal(SIGALRM, SIG_IGN);
+    signal(SIGINT, handler);
+    alarm(1);
+    pause();
+    if(sigpending(&s) < 0) perror("sigpending");
+    if(sigismember(&s, SIGALRM)) {
+            char m[] = "sigalrm is pending.\n";
+            write(1, m, sizeof(m));
+        } else {
+                char m[] = "sigalrm is not pending.\n";
+                write(1, m, sizeof(m));
+            }
+    return 0;
+}

Diff for: hw3/jmp1.c

@@ -0,0 +1,28 @@
+#include "libmini.h"
+
+typedef void (*proc_t)();
+static jmp_buf jb;
+
+#define FUNBODY(m, from) { write(1, m, strlen(m)); longjmp(jb, from); }
+
+void a() FUNBODY("This is function a().\n", 1);
+void b() FUNBODY("This is function b().\n", 2);
+void c() FUNBODY("This is function c().\n", 3);
+void d() FUNBODY("This is function d().\n", 4);
+void e() FUNBODY("This is function e().\n", 5);
+void f() FUNBODY("This is function f().\n", 6);
+void g() FUNBODY("This is function g().\n", 7);
+void h() FUNBODY("This is function h().\n", 8);
+void i() FUNBODY("This is function i().\n", 9);
+void j() FUNBODY("This is function j().\n", 10);
+
+proc_t funs[] = { a, b, c, d, e, f, g, h, i, j };
+
+int main() {
+    volatile int i = 0;
+    if(setjmp(jb) != 0) {
+            i++;
+        }
+    if(i < 10) funs[i]();
+    return 0;
+}