Add a simple "kernel" binary that can be used for testing

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

diff --git a/tools/kvm/tests/kernel/Makefile b/tools/kvm/tests/kernel/Makefile
new file mode 100644 (file)
index 0000000..c7dd8da
--- /dev/null
+++ b/tools/kvm/tests/kernel/Makefile
@@ -0,0 +1,20 @@
+NAME   := kernel
+
+BIN    := $(NAME).bin
+ELF    := $(NAME).elf
+OBJ    := $(NAME).o
+
+all: $(BIN)
+
+$(BIN): $(ELF)
+       objcopy -O binary $< $@
+
+$(ELF): $(OBJ)
+       ld -Ttext=0x00 -nostdlib -static $< -o $@
+
+%.o: %.S
+       gcc -nostdinc -c $< -o $@
+
+clean:
+       rm -f $(BIN) $(ELF) $(OBJ)
+.PHONY: clean

diff --git a/tools/kvm/tests/kernel/README b/tools/kvm/tests/kernel/README
new file mode 100644 (file)
index 0000000..2923777
--- /dev/null
+++ b/tools/kvm/tests/kernel/README
@@ -0,0 +1,16 @@
+Compiling
+---------
+
+You can simply type:
+
+  $ make
+
+to build a 16-bit binary that uses the i8086 instruction set.
+
+Disassembling
+-------------
+
+Use the "-m i8086" command line option with objdump to make sure it knows we're
+dealing with i8086 instruction set:
+
+  $ objdump -d -m i8086 i8086.elf

diff --git a/tools/kvm/tests/kernel/kernel.S b/tools/kvm/tests/kernel/kernel.S
new file mode 100644 (file)
index 0000000..2824b64
--- /dev/null
+++ b/tools/kvm/tests/kernel/kernel.S
@@ -0,0 +1,8 @@
+       .code16gcc
+       .text
+       .globl  _start
+       .type   _start, @function
+_start:
+       # "This is probably the largest possible kernel that is bug free." -- Avi Kivity
+       1:
+       jmp 1b