tests/tcg/i386: add system mode Hello World test
This introduces the build framework for simple i386 system tests. The first test is the eponymous "Hello World" which simply outputs the text on the serial port and then exits. I've included the framework for x86_64 but it is not in this series as it is a work in progress. Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
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tests/tcg/i386/Makefile.softmmu-target
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46
tests/tcg/i386/Makefile.softmmu-target
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#
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# x86 system tests
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#
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# This currently builds only for i386. The common C code is built
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# with standard compiler flags however so we can support both by
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# adding additional boot files for x86_64.
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#
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I386_SYSTEM_SRC=$(SRC_PATH)/tests/tcg/i386/system
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X64_SYSTEM_SRC=$(SRC_PATH)/tests/tcg/x86_64/system
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# Set search path for all sources
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VPATH+=$(I386_SYSTEM_SRC)
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# These objects provide the basic boot code and helper functions for all tests
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CRT_OBJS=boot.o
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X86_TEST_SRCS=$(wildcard $(I386_SYSTEM_SRC)/*.c)
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X86_TESTS = $(patsubst $(I386_SYSTEM_SRC)/%.c, %, $(X86_TEST_SRCS))
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ifeq ($(TARGET_X86_64), y)
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CRT_PATH=$(X64_SYSTEM_SRC)
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LINK_SCRIPT=$(X64_SYSTEM_SRC)/kernel.ld
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LDFLAGS=-Wl,-T$(LINK_SCRIPT) -Wl,-melf_x86_64
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else
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CRT_PATH=$(I386_SYSTEM_SRC)
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CFLAGS+=-m32
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LINK_SCRIPT=$(I386_SYSTEM_SRC)/kernel.ld
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LDFLAGS=-Wl,-T$(LINK_SCRIPT) -Wl,-melf_i386
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# FIXME: move to common once x86_64 is bootstrapped
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TESTS+=$(X86_TESTS)
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endif
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CFLAGS+=-nostdlib -ggdb -O0 $(MINILIB_INC)
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LDFLAGS+=-static -nostdlib $(CRT_OBJS) $(MINILIB_OBJS) -lgcc
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# building head blobs
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.PRECIOUS: $(CRT_OBJS)
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%.o: $(CRT_PATH)/%.S
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$(CC) $(CFLAGS) -c $< -o $@
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# Build and link the tests
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%: %.c $(LINK_SCRIPT) $(CRT_OBJS) $(MINILIB_OBJS)
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$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
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# Running
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QEMU_OPTS+=-device isa-debugcon,chardev=output -device isa-debug-exit,iobase=0xf4,iosize=0x4 -kernel
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tests/tcg/i386/system/boot.S
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tests/tcg/i386/system/boot.S
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/*
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* i386 boot code, based on qemu-bmibug.
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*
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* Copyright 2019 Doug Gale
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* Copyright 2019 Linaro
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*
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* This work is licensed under the terms of the GNU GPL, version 3 or later.
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* See the COPYING file in the top-level directory.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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.section .head
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/* Multi-boot header */
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multiboot_st:
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.int 0x1BADB002
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.int 0x10000
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.int -(0x10000+0x1BADB002)
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// Load address
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.int __load_st
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.int __load_st
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.int __load_en
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.int __bss_en
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.int _start
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// mode
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.int 0
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// width
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.int 0
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// height
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.int 0
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// depth
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.int 0
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.code32
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.section .text
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/* Kernel Entry Point */
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.global _start
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_start:
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// Setup stack ASAP
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mov $stack_end,%esp
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// Load GDT ASAP
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lgdt gdtr
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ljmp $0x8,$.Lloadcs
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.Lloadcs:
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mov $0x10,%eax
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mov %eax,%ds
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mov %eax,%es
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mov %eax,%fs
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mov %eax,%gs
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mov %eax,%ss
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// Fixup the IDT to the ridiculous i386 layout
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xor %ebx,%ebx
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.Lnextidt:
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mov idt_00(,%ebx,8),%eax
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shr $16,%eax
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movw $0x8,idt_00+2(,%ebx,8)
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movw $0x8E00,idt_00+4(,%ebx,8)
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movw %ax,idt_00+6(,%ebx,8)
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add $1,%ebx
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cmp $32,%ebx
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jl .Lnextidt
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// Load IDTR
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push $idt_00
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push $((32 * 8 - 1) << 16)
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lidt 2(%esp)
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add $8,%esp
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/*
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* Don't worry about stack frame, assume everthing
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* is garbage when we return, we won't need it.
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*/
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call main
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/* output any non-zero result in eax to isa-debug-exit device */
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test %al, %al
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jz 1f
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out %ax, $0xf4
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1: /* QEMU ACPI poweroff */
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mov $0x604,%edx
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mov $0x2000,%eax
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out %ax,%dx
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hlt
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jmp 1b
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/*
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* Helper Functions
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*/
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/* Output a single character to serial port */
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.global __sys_outc
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__sys_outc:
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pushl %ebp
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movl %esp, %ebp
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out %al,$0xE9
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movl %ebp, %esp
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popl %ebp
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ret
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/* Interrupt Descriptor Table */
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.section .data
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.align 16
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idt_00: .int 0, 0
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idt_01: .int 0, 0
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idt_02: .int 0, 0
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idt_03: .int 0, 0
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idt_04: .int 0, 0
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idt_05: .int 0, 0
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idt_06: .int 0, 0 /* intr_6_opcode, Invalid Opcode */
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idt_07: .int 0, 0
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idt_08: .int 0, 0
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idt_09: .int 0, 0
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idt_0A: .int 0, 0
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idt_0B: .int 0, 0
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idt_0C: .int 0, 0
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idt_0D: .int 0, 0
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idt_0E: .int 0, 0
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idt_0F: .int 0, 0
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idt_10: .int 0, 0
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idt_11: .int 0, 0
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idt_12: .int 0, 0
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idt_13: .int 0, 0
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idt_14: .int 0, 0
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idt_15: .int 0, 0
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idt_16: .int 0, 0
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idt_17: .int 0, 0
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idt_18: .int 0, 0
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idt_19: .int 0, 0
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idt_1A: .int 0, 0
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idt_1B: .int 0, 0
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idt_1C: .int 0, 0
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idt_1D: .int 0, 0
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idt_1E: .int 0, 0
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idt_1F: .int 0, 0
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gdt:
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.short 0
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gdtr:
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.short gdt_en - gdt - 1
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.int gdt
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// Code
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.short 0xFFFF
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.short 0
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.byte 0
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.byte 0x9b
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.byte 0xCF
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.byte 0
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// Data
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.short 0xFFFF
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.short 0
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.byte 0
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.byte 0x93
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.byte 0xCF
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.byte 0
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gdt_en:
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.section .bss
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.align 16
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stack: .space 65536
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stack_end:
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tests/tcg/i386/system/hello.c
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tests/tcg/i386/system/hello.c
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/*
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* Hello World, system test version
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*
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* We don't have the benefit of libc, just builtin C primitives and
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* whatever is in minilib.
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*/
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#include <minilib.h>
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int main(void)
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{
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ml_printf("Hello World\n");
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return 0;
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}
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tests/tcg/i386/system/kernel.ld
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tests/tcg/i386/system/kernel.ld
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SECTIONS {
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. = 0x100000;
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.text : {
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__load_st = .;
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*(.head)
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*(.text)
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}
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.rodata : {
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*(.rodata)
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}
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.data : {
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*(.data)
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__load_en = .;
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}
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.bss : {
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*(.bss)
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__bss_en = .;
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}
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}
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