[Qemu-devel] [PULL 30/52] tests/tcg/x86_64: add a PVH crt.o for x86_64 system tests

[Alex Bennée]

Instead of doing the full real to 64 bit dance we are attempting to
leverage Xen's PVH boot spec to go from 32 bit to 64 bit.

Signed-off-by: Alex Bennée <address@hidden>

diff --git a/tests/tcg/i386/Makefile.softmmu-target 
b/tests/tcg/i386/Makefile.softmmu-target
index e1d880f9b5..0a4364868c 100644
--- a/tests/tcg/i386/Makefile.softmmu-target
+++ b/tests/tcg/i386/Makefile.softmmu-target
@@ -14,6 +14,7 @@ CRT_OBJS=boot.o
 
 ifeq ($(TARGET_X86_64), y)
 CRT_PATH=$(X64_SYSTEM_SRC)
+CFLAGS=-march=x86-64
 LINK_SCRIPT=$(X64_SYSTEM_SRC)/kernel.ld
 LDFLAGS=-Wl,-T$(LINK_SCRIPT) -Wl,-melf_x86_64
 else
diff --git a/tests/tcg/x86_64/system/boot.S b/tests/tcg/x86_64/system/boot.S
new file mode 100644
index 0000000000..205cfbd398
--- /dev/null
+++ b/tests/tcg/x86_64/system/boot.S
@@ -0,0 +1,277 @@
+/*
+ * x86_64 boot and support code
+ *
+ * Copyright 2019 Linaro
+ *
+ * This work is licensed under the terms of the GNU GPL, version 3 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * Unlike the i386 version we instead use Xen's PVHVM booting header
+ * which should drop us automatically into 32 bit mode ready to go. I've
+ * nabbed bits of the Linux kernel setup to achieve this.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+        .section .head
+
+#define ELFNOTE_START(name, type, flags)       \
+.pushsection .note.name, flags,@note   ;       \
+  .balign 4                            ;       \
+  .long 2f - 1f                /* namesz */    ;       \
+  .long 4484f - 3f     /* descsz */    ;       \
+  .long type                           ;       \
+1:.asciz #name                         ;       \
+2:.balign 4                            ;       \
+3:
+
+#define ELFNOTE_END                            \
+4484:.balign 4                         ;       \
+.popsection                            ;
+
+#define ELFNOTE(name, type, desc)              \
+       ELFNOTE_START(name, type, "")           \
+               desc                    ;       \
+       ELFNOTE_END
+
+#define XEN_ELFNOTE_ENTRY          1
+#define XEN_ELFNOTE_HYPERCALL_PAGE 2
+#define XEN_ELFNOTE_VIRT_BASE      3
+#define XEN_ELFNOTE_PADDR_OFFSET   4
+#define XEN_ELFNOTE_PHYS32_ENTRY  18
+
+#define __ASM_FORM(x)  x
+#define __ASM_FORM_RAW(x)     x
+#define __ASM_FORM_COMMA(x) x,
+#define __ASM_SEL(a,b)           __ASM_FORM(b)
+#define __ASM_SEL_RAW(a,b)      __ASM_FORM_RAW(b)
+#define _ASM_PTR       __ASM_SEL(.long, .quad)
+
+       ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR 0x100000)
+       ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          _ASM_PTR _start)
+       ELFNOTE(Xen, XEN_ELFNOTE_PHYS32_ENTRY,   _ASM_PTR _start)    /* entry 
== virtbase */
+       ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,   _ASM_PTR 0)
+
+       /*
+       * Entry point for PVH guests.
+       *
+       * Xen ABI specifies the following register state when we come here:
+       *
+       * - `ebx`: contains the physical memory address where the loader has 
placed
+       *          the boot start info structure.
+       * - `cr0`: bit 0 (PE) must be set. All the other writeable bits are 
cleared.
+       * - `cr4`: all bits are cleared.
+       * - `cs `: must be a 32-bit read/execute code segment with a base of ‘0’
+       *          and a limit of ‘0xFFFFFFFF’. The selector value is 
unspecified.
+       * - `ds`, `es`: must be a 32-bit read/write data segment with a base of
+       *               ‘0’ and a limit of ‘0xFFFFFFFF’. The selector values 
are all
+       *               unspecified.
+       * - `tr`: must be a 32-bit TSS (active) with a base of '0' and a limit
+       *         of '0x67'.
+       * - `eflags`: bit 17 (VM) must be cleared. Bit 9 (IF) must be cleared.
+       *             Bit 8 (TF) must be cleared. Other bits are all 
unspecified.
+       *
+       * All other processor registers and flag bits are unspecified. The OS 
is in
+       * charge of setting up it's own stack, GDT and IDT.
+       */
+        .code32
+        .section .text
+
+.global _start
+_start:
+       cld
+        lgdt gdtr
+
+        ljmp $0x8,$.Lloadcs
+.Lloadcs:
+        mov $0x10,%eax
+        mov %eax,%ds
+        mov %eax,%es
+        mov %eax,%fs
+        mov %eax,%gs
+        mov %eax,%ss
+
+       /* Enable PAE mode (bit 5). */
+       mov %cr4, %eax
+       btsl $5, %eax
+       mov %eax, %cr4
+
+#define MSR_EFER               0xc0000080 /* extended feature register */
+
+       /* Enable Long mode. */
+       mov $MSR_EFER, %ecx
+       rdmsr
+       btsl $8, %eax
+       wrmsr
+
+       /* Enable paging */
+       mov $.Lpml4, %ecx
+       mov %ecx, %cr3
+
+       mov %cr0, %eax
+       btsl $31, %eax
+       mov %eax, %cr0
+
+       /* Jump to 64-bit mode. */
+        lgdt gdtr64
+        ljmp $0x8,$.Lenter64
+
+        .code64
+        .section .text
+.Lenter64:
+
+
+       // Setup stack ASAP
+       movq $stack_end,%rsp
+
+        /* don't worry about stack frame, assume everthing is garbage when we 
return */
+       call main
+
+        /* output any non-zero result in eax to isa-debug-exit device */
+        test %al, %al
+        jz 1f
+        out %ax, $0xf4
+
+1:      /* QEMU ACPI poweroff */
+       mov $0x604,%edx
+       mov $0x2000,%eax
+       out %ax,%dx
+       hlt
+       jmp 1b
+
+        /*
+         * Helper Functions
+         *
+         * x86_64 calling convention is rdi, rsi, rdx, rcx, r8, r9
+         */
+
+        /* Output a single character to serial port */
+        .global __sys_outc
+__sys_outc:
+        pushq %rax
+        mov %rax, %rdx
+       out %al,$0xE9
+        popq %rax
+        ret
+
+       /* Interrupt Descriptor Table */
+
+        .section .data
+        .align 16
+
+idt_00: .int 0, 0
+idt_01: .int 0, 0
+idt_02: .int 0, 0
+idt_03: .int 0, 0
+idt_04: .int 0, 0
+idt_05: .int 0, 0
+idt_06: .int 0, 0 /* intr_6_opcode, Invalid Opcode */
+idt_07: .int 0, 0
+idt_08: .int 0, 0
+idt_09: .int 0, 0
+idt_0A: .int 0, 0
+idt_0B: .int 0, 0
+idt_0C: .int 0, 0
+idt_0D: .int 0, 0
+idt_0E: .int 0, 0
+idt_0F: .int 0, 0
+idt_10: .int 0, 0
+idt_11: .int 0, 0
+idt_12: .int 0, 0
+idt_13: .int 0, 0
+idt_14: .int 0, 0
+idt_15: .int 0, 0
+idt_16: .int 0, 0
+idt_17: .int 0, 0
+idt_18: .int 0, 0
+idt_19: .int 0, 0
+idt_1A: .int 0, 0
+idt_1B: .int 0, 0
+idt_1C: .int 0, 0
+idt_1D: .int 0, 0
+idt_1E: .int 0, 0
+idt_1F: .int 0, 0
+
+
+       /*
+        * Global Descriptor Table (GDT)
+        *
+        * This describes various memory areas (segments) through
+        * segment descriptors. In 32 bit mode each segment each
+        * segement is associated with segment registers which are
+        * implicitly (or explicitly) referenced depending on the
+        * instruction. However in 64 bit mode selectors are flat and
+        * segmented addressing isn't used.
+        */
+gdt:
+        .short 0
+gdtr:
+        .short gdt_en - gdt - 1
+        .int gdt
+
+        // Code cs:
+        .short 0xFFFF
+        .short 0
+        .byte 0
+        .byte 0x9b
+        .byte 0xCF
+        .byte 0
+
+        // Data  ds:, ss:, es:, fs:, and gs:
+        .short 0xFFFF
+        .short 0
+        .byte 0
+        .byte 0x93
+        .byte 0xCF
+        .byte 0
+gdt_en:
+
+gdt64:
+        .short 0
+gdtr64:
+        .short gdt64_en - gdt64 - 1
+        .int gdt64
+
+        // Code
+        .short 0xFFFF
+        .short 0
+        .byte 0
+        .byte 0x9b
+        .byte 0xAF
+        .byte 0
+
+        // Data
+        .short 0xFFFF
+        .short 0
+        .byte 0
+        .byte 0x93
+        .byte 0xCF
+        .byte 0
+gdt64_en:
+
+       .section .bss
+        .align 16
+
+stack: .space 65536
+stack_end:
+
+       .section .data
+
+.align 4096
+.Lpd:
+i = 0
+        .rept 512 * 4
+        .quad 0x1e7 | (i << 21)
+        i = i + 1
+        .endr
+
+.align 4096
+.Lpdp:
+        .quad .Lpd + 7 + 0 * 4096 /* 0-1 GB */
+        .quad .Lpd + 7 + 1 * 4096 /* 1-2 GB */
+        .quad .Lpd + 7 + 2 * 4096 /* 2-3 GB */
+        .quad .Lpd + 7 + 3 * 4096 /* 3-4 GB */
+
+.align 4096
+.Lpml4:
+        .quad .Lpdp + 7 /* 0-512 GB */
diff --git a/tests/tcg/x86_64/system/kernel.ld 
b/tests/tcg/x86_64/system/kernel.ld
new file mode 100644
index 0000000000..49c12b04ae
--- /dev/null
+++ b/tests/tcg/x86_64/system/kernel.ld
@@ -0,0 +1,33 @@
+PHDRS {
+       text PT_LOAD FLAGS(5);          /* R_E */
+       note PT_NOTE FLAGS(0);          /* ___ */
+}
+
+SECTIONS {
+       . = 0x100000;
+
+       .text : {
+               __load_st = .;
+               *(.head)
+               *(.text)
+       } :text
+
+       .rodata : {
+               *(.rodata)
+       } :text
+
+        /* Keep build ID and PVH notes in same section */
+        .notes :  {
+               *(.note.*)
+        } :note
+
+        .data : {
+               *(.data)
+               __load_en = .;
+       } :text
+
+       .bss : {
+               *(.bss)
+               __bss_en = .;
+       }
+}
-- 
2.20.1