LibC: Port setjmp syntax to avoid nasm dependency

LibC/Makefile

@@ -48,7 +48,7 @@ LIBC_OBJS = \
  netdb.o \
  sched.o
 
-ASM_OBJS = setjmp.no crti.ao crtn.ao
+ASM_OBJS = setjmp.ao crti.ao crtn.ao
 
 CPP_OBJS = $(AK_OBJS) $(WIDGETS_OBJS) $(LIBC_OBJS)
 
@@ -68,9 +68,6 @@ $(LIBRARY): $(CPP_OBJS) $(ASM_OBJS)
 .cpp.o:
  @echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-%.no: %.asm
- @echo "NASM $@"; nasm -f elf -o $@ $<
-
 %.ao: %.S
  @echo "AS $@"; $(AS) -o $@ $<
 

LibC/setjmp.S

@@ -0,0 +1,31 @@
+.global setjmp
+setjmp:
+ mov 4(%esp), %eax
+ mov %ebx, 0(%eax)
+ mov %esi, 4(%eax)
+ mov %edi, 8(%eax)
+ mov %ebp, 12(%eax)
+ lea 4(%esp), %ecx
+ mov %ecx, 16(%eax)
+ mov (%esp), %ecx
+ mov %ecx, 20(%eax)
+ xor %eax, %eax
+ ret
+
+.global longjmp
+longjmp:
+ mov 4(%esp), %edx
+ mov 8(%esp), %eax
+ mov 0(%edx), %ebx
+ mov 4(%edx), %esi
+ mov 8(%edx), %edi
+ mov 12(%edx), %ebp
+ mov 16(%edx), %ecx
+ mov %ecx, %esp
+ mov 20(%edx), %ecx
+ test %eax, %eax
+ jnz .nonzero
+ mov 1, %eax
+.nonzero:
+ jmp *%ecx
+

LibM/Makefile

@@ -13,9 +13,6 @@ $(LIBRARY): $(OBJS)
 .cpp.o:
  @echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-%.no: %.asm
- @echo "NASM $@"; nasm -f elf -o $@ $<
-
 -include $(OBJS:%.o=%.d)
 
 clean:

Meta/BuildInstructions.md

@@ -12,9 +12,9 @@ First off, GCC needs MPFR, MPC and GMP. On Ubuntu, this is as simple as:
 
  sudo apt install libmpfr-dev libmpc-dev libgmp-dev
 
-For Serenity, we will need nasm, e2fsprogs and QEMU:
+For Serenity, we will need e2fsprogs and QEMU:
 
- sudo apt install nasm e2fsprogs qemu-system-i386
+ sudo apt install e2fsprogs qemu-system-i386
 
 ## Binutils: