QEMU AArch64(ARM64) で遊ぼう

#include <stdlib.h>
#include <stdio.h>

int main()
{
    printf("Hello AArch64 world.\n") ;
    return(0) ;
}

$ aarch64-linux-gnu-gcc hello.c -o hello

$ aarch64-linux-gnu-readelf -h hello
ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           AArch64
  Version:                           0x1
  Entry point address:               0x400410
  Start of program headers:          64 (bytes into file)
  Start of section headers:          9304 (bytes into file)
  Flags:                             0x0
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         7
  Size of section headers:           64 (bytes)
  Number of section headers:         36
  Section header string table index: 33

$ ./qemu-2.4.0.1/aarch64-linux-user/qemu-aarch64
usage: qemu-aarch64 [options] program [arguments...]
Linux CPU emulator (compiled for aarch64 emulation)

Options and associated environment variables:

Argument      Env-variable      Description
-h                              print this help
-g port       QEMU_GDB          wait gdb connection to 'port'
-L path       QEMU_LD_PREFIX    set the elf interpreter prefix to 'path'
-s size       QEMU_STACK_SIZE   set the stack size to 'size' bytes
-cpu model    QEMU_CPU          select CPU (-cpu help for list)
-E var=value  QEMU_SET_ENV      sets targets environment variable (see below)
-U var        QEMU_UNSET_ENV    unsets targets environment variable (see below)
-0 argv0      QEMU_ARGV0        forces target process argv[0] to be 'argv0'
-r uname      QEMU_UNAME        set qemu uname release string to 'uname'
-B address    QEMU_GUEST_BASE   set guest_base address to 'address'
-R size       QEMU_RESERVED_VA  reserve 'size' bytes for guest virtual address space
-d item[,...] QEMU_LOG          enable logging of specified items (use '-d help' for a list of items)
-D logfile    QEMU_LOG_FILENAME write logs to 'logfile' (default stderr)
-p pagesize   QEMU_PAGESIZE     set the host page size to 'pagesize'
-singlestep   QEMU_SINGLESTEP   run in singlestep mode
-strace       QEMU_STRACE       log system calls
-seed         QEMU_RAND_SEED    Seed for pseudo-random number generator
-version      QEMU_VERSION      display version information and exit

Defaults:
QEMU_LD_PREFIX  = /usr/gnemul/qemu-aarch64
QEMU_STACK_SIZE = 8388608 byte

You can use -E and -U options or the QEMU_SET_ENV and
QEMU_UNSET_ENV environment variables to set and unset
environment variables for the target process.
It is possible to provide several variables by separating them
by commas in getsubopt(3) style. Additionally it is possible to
provide the -E and -U options multiple times.
The following lines are equivalent:
    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG
    -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG
    QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG
Note that if you provide several changes to a single variable
the last change will stay in effect.

$ ./qemu-2.4.0.1/aarch64-linux-user/qemu-aarch64 -L /usr/local/arm64_linux/aarch64-linux-gnu ./hello
Hello AArch64 world.

$ cat gdbtest.c
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    int i ;
    printf("argc=%d\n",argc) ;
    for( i=0 ; i<argc ; i++ ){
        printf("%s\n",argv[i]) ;
    }
    return(0) ;
}

$ aarch64-linux-gnu-gcc -static -g gdbtest.c -o gdbtest

$ ./qemu-2.4.0.1/aarch64-linux-user/qemu-aarch64 -g 1111 -L /usr/local/arm64_linux/aarch64-linux-gnu ./gdbtest aaa bbb ccc ddd eee

$ aarch64-linux-gnu-gdb -q
(gdb) file gdbtest
Reading symbols from gdbtest...done.
(gdb) target remote localhost:1111
Remote debugging using localhost:1111
warning: Can not parse XML target description; XML support was disabled at compile time
_start () at ../sysdeps/aarch64/start.S:48
48              mov     x29, #0
(gdb) b main
Breakpoint 1 at 0x400ab0: file gdbtest.c, line 7.
(gdb) c
Continuing.

Breakpoint 1, main (argc=6, argv=0x40007fffb8) at gdbtest.c:7
7           printf("argc=%d\n",argc) ;
(gdb) l
2       #include <stdio.h>
3
4       int main(int argc, char* argv[])
5       {
6           int i ;
7           printf("argc=%d\n",argc) ;
8           for( i=0 ; i<argc ; i++ ){
9               printf("%s\n",argv[i]) ;
10          }
11          return(0) ;
(gdb)