diff options
Diffstat (limited to 'guest')
| -rw-r--r-- | guest/Makefile | 13 | ||||
| -rw-r--r-- | guest/guest64.S | 17 |
2 files changed, 28 insertions, 2 deletions
diff --git a/guest/Makefile b/guest/Makefile index e3f1e1b..a2eea1b 100644 --- a/guest/Makefile +++ b/guest/Makefile @@ -1,8 +1,17 @@ +guest: guest16 guest64 +disasm: disasm16 disasm64 + guest16: guest.ld guest16.S $(CC) $(CFLAGS) -m16 -o $@ -nostdlib -ffreestanding -Wpedantic -Wall -Wextra -Werror -T guest.ld guest16.S -disasm: guest16 +guest64: guest.ld guest64.S + $(CC) $(CFLAGS) -m64 -o $@ -nostdlib -fPIC -ffreestanding -Wpedantic -Wall -Wextra -Werror -T guest.ld guest64.S + +disasm16: guest16 objdump -D -b binary -m i8086 -M intel $^ +disasm64: guest64 + objdump -D -b binary -m i386:x86-64 -M intel $^ + clean: - $(RM) guest16 + $(RM) guest16 guest64 diff --git a/guest/guest64.S b/guest/guest64.S new file mode 100644 index 0000000..1862749 --- /dev/null +++ b/guest/guest64.S @@ -0,0 +1,17 @@ +.intel_syntax noprefix + +.section .boot, "ax", @progbits + // Trigger `KVM_EXIT_IO:KVM_EXIT_IO_OUT` by writing string to output port. + mov rdx, 0x1000 // Output port. + lea rsi, [rip + msg] // Address of string. + mov rcx, [rip + msg_len] // Len of string. + rep outsb // Write ds:rsi to output port rdx. + + // Trigger `KVM_EXIT_HLT`. + hlt + +.section .rodata, "a", @progbits +msg: + .asciz "Hello from Long Mode!\n" +msg_len: + .byte .-msg |