initial commit

.gitignore

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+build/*
+*.o
+*.d
+*.elf

Makefile

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+# 
+# Bao, a Lightweight Static Partitioning Hypervisor 
+#
+# Copyright (c) Bao Project (www.bao-project.org), 2019-
+#
+# Authors:
+#      Jose Martins <[email protected]>
+#      Sandro Pinto <[email protected]>
+#
+# Bao is free software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License version 2 as published by the Free
+# Software Foundation, with a special exception exempting guest code from such
+# license. See the COPYING file in the top-level directory for details. 
+#
+#
+
+
+NAME := bao_bare-metal_guest
+
+CROSS_COMPILE ?= aarch64-elf-
+CC:=$(CROSS_COMPILE)gcc
+AS:=$(CROSS_COMPILE)as
+LD:=$(CROSS_COMPILE)ld
+OBJCOPY:=$(CROSS_COMPILE)objcopy
+OBJDUMP:=$(CROSS_COMPILE)objdump
+
+OPT_LEVEL = 3
+DEBUG_LEVEL = 0
+
+ifneq ($(MAKECMDGOALS), clean)
+ifeq ($(PLAT),)
+$(error Undefined platform)
+endif
+endif
+
+SRC_DIR:=./src
+BUILD_DIR:=build/$(PLAT)
+TARGET:=$(BUILD_DIR)/$(NAME)
+PLAT_DIR:=$(SRC_DIR)/platform/$(PLAT)
+SRC_DIRS:=$(SRC_DIR) $(PLAT_DIR)
+INC_DIRS:=$(addsuffix /inc, $(SRC_DIRS))
+
+ifeq ($(wildcard $(PLAT_DIR)),)
+$(error unsupported platform $(PLAT))
+endif
+
+LINKER_SCRIPT:=linker.ld
+C_SRC = $(foreach src_dir, $(SRC_DIRS), $(wildcard $(src_dir)/*.c))
+ASM_SRC = $(foreach src_dir, $(SRC_DIRS), $(wildcard $(src_dir)/*.S))
+OBJS = $(C_SRC:$(SRC_DIR)/%.c=$(BUILD_DIR)/%.o) $(ASM_SRC:$(SRC_DIR)/%.S=$(BUILD_DIR)/%.o)
+DEPS = $(OBJS:%=%.d)
+DIRS:=$(sort $(dir $(OBJS) $(DEPS)))
+
+GENERIC_FLAGS = -march=armv8-a -O$(OPT_LEVEL) -g$(DEBUG_LEVEL)
+ASFLAGS = $(GENERIC_FLAGS)
+CFLAGS = $(GENERIC_FLAGS)
+CPPFLAGS =	$(addprefix -I, $(INC_DIRS)) -MD -MF $@.d
+LDFLAGS = $(GENERIC_FLAGS) -nostartfiles -ffreestanding -static
+
+all: $(TARGET).bin
+
+ifneq ($(MAKECMDGOALS), clean)
+-include $(DEPS)
+endif
+
+$(TARGET).bin: $(TARGET).elf
+	$(OBJCOPY) -O binary $< $@
+
+$(TARGET).elf: $(OBJS) $(LD_FILE)
+	$(CC) $(LDFLAGS) -T$(LINKER_SCRIPT) $(OBJS) -o $@
+	$(OBJDUMP) -S $@ > $(TARGET).asm
+	$(OBJDUMP) -x -d --wide $@ > $(TARGET).lst
+
+$(BUILD_DIR):
+	mkdir -p $@
+
+$(OBJS): | $(BUILD_DIR)
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.S
+	$(CC) $(ASFLAGS) $(CPPFLAGS) -c $< -o $@
+
+.SECONDEXPANSION:
+
+$(OBJS) $(DEPS): | $$(@D)/
+
+$(DIRS):
+	mkdir -p $@
+
+
+clean:
+	@rm -rf build
+	@rm -f *.elf
+	@rm -f *.bin	
+	@rm -f *.asm
+	@rm -f *.lst
+
+.PHONY: all clean

linker.ld

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+/** 
+ * Bao, a Lightweight Static Partitioning Hypervisor 
+ *
+ * Copyright (c) Bao Project (www.bao-project.org), 2019-
+ *
+ * Authors:
+ *      Jose Martins <[email protected]>
+ *      Sandro Pinto <[email protected]>
+ *
+ * Bao is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License version 2 as published by the Free
+ * Software Foundation, with a special exception exempting guest code from such
+ * license. See the COPYING file in the top-level directory for details. 
+ *
+ */
+
+SECTIONS {
+
+    .start : {
+        *(.start)
+    } 
+
+    .text :  {
+        *(.text*)
+    } 
+
+    .rodata :  {
+        *(.rodata*)
+    }
+
+    .data : {
+        *(.data .data.*)
+        *(.sdata .sdata.* .sdata2.*)
+    }
+
+    .page_tables : {
+        *(.page_tables)
+    }
+
+    .bss (NOLOAD) :  {	
+        __bss_start = .;
+        *(.bss* .sbss*) 
+        *(COMMON)	
+        __bss_end = .;
+    }
+
+    _stack_base = .;
+    . += 0x4000 * 4;
+    _heap_base = .;
+}

src/exceptions.S

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+/** 
+ * Bao, a Lightweight Static Partitioning Hypervisor 
+ *
+ * Copyright (c) Bao Project (www.bao-project.org), 2019-
+ *
+ * Authors:
+ *      Jose Martins <[email protected]>
+ *      Sandro Pinto <[email protected]>
+ *
+ * Bao is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License version 2 as published by the Free
+ * Software Foundation, with a special exception exempting guest code from such
+ * license. See the COPYING file in the top-level directory for details. 
+ *
+ */
+
+#define ENTRY_SIZE   (0x80)
+
+.macro SAVE_REGS
+
+    sub sp, sp, #(22 * 8)
+
+    stp x0, x1,   [sp, #(8*0)]
+    stp x2, x3,   [sp, #(8*2)]
+    stp x4, x5,   [sp, #(8*4)]
+    stp x6, x7,   [sp, #(8*6)]
+    stp x8, x9,   [sp, #(8*8)]
+    stp x10, x11, [sp, #(8*10)]
+    stp x12, x13, [sp, #(8*12)]
+    stp x14, x15, [sp, #(8*14)]
+    stp x16, x17, [sp, #(8*16)]
+    stp x18, x19, [sp, #(8*18)]
+    stp x29, x30, [sp, #(8*28)]
+.endm
+
+.macro RESTORE_REGS
+    ldp x0, x1,   [sp, #(8*0)]
+    ldp x2, x3,   [sp, #(8*2)]
+    ldp x4, x5,   [sp, #(8*4)]
+    ldp x6, x7,   [sp, #(8*6)]
+    ldp x8, x9,   [sp, #(8*8)]
+    ldp x10, x11, [sp, #(8*10)]
+    ldp x12, x13, [sp, #(8*12)]
+    ldp x14, x15, [sp, #(8*14)]
+    ldp x16, x17, [sp, #(8*16)]
+    ldp x18, x19, [sp, #(8*18)]
+    ldp x29, x30, [sp, #(8*28)]
+
+    add sp, sp, #(22 * 8)
+.endm
+
+.balign 0x800
+.global _exception_vector
+_exception_vector:
+/* 
+ * EL1 with SP0
+ */  
+.balign ENTRY_SIZE
+curr_el_sp0_sync:        
+    b	.
+.balign ENTRY_SIZE
+curr_el_sp0_irq:  
+    b   .
+.balign ENTRY_SIZE
+curr_el_sp0_fiq:         
+    b	.
+.balign ENTRY_SIZE
+curr_el_sp0_serror:      
+    b	.
+
+
+/* 
+ * EL1 with SPx
+ */  
+.balign ENTRY_SIZE  
+curr_el_spx_sync:        
+    b	.
+.balign ENTRY_SIZE
+curr_el_spx_irq:       
+    SAVE_REGS
+    bl	gic_handle
+    RESTORE_REGS
+    eret
+.balign ENTRY_SIZE
+curr_el_spx_fiq:         
+    SAVE_REGS
+    bl	gic_handle
+    RESTORE_REGS
+    eret
+.balign ENTRY_SIZE
+curr_el_spx_serror:      
+    b	.         
+
+/* 
+ * Lower EL using AArch64
+ */  
+
+.balign ENTRY_SIZE
+lower_el_aarch64_sync:
+    b .
+.balign ENTRY_SIZE
+lower_el_aarch64_irq:    
+    b .
+.balign ENTRY_SIZE
+lower_el_aarch64_fiq:    
+    b	.
+.balign ENTRY_SIZE
+lower_el_aarch64_serror: 
+    b	.          
+
+/* 
+ * Lower EL using AArch32
+ */  
+.balign ENTRY_SIZE   
+lower_el_aarch32_sync:   
+    b	.
+.balign ENTRY_SIZE
+lower_el_aarch32_irq:    
+    b	.
+.balign ENTRY_SIZE
+lower_el_aarch32_fiq:    
+    b	.
+.balign ENTRY_SIZE
+lower_el_aarch32_serror: 
+    b	.
+
+.balign ENTRY_SIZE