I was working with qemuand wanted to understag ATAG structure.
In Monitor mode I used xp /16i 0x100 and I got really confused.
with xp /16i 0x100:
At address 0x120 the DWords are 0x00000000, 0x00000004, 0x54410009, 0x74736574
with xp /16x 0x100:
At address 0x120 the DWords are 0x54410001, 0x00000001, 0x00000001, 0x00000000
from my Terminal:
(qemu) xp /16x 0x100
0000000000000100: 0x00000005 0x54410001 0x00000001 0x00001000
0000000000000110: 0x00000000 0x00000004 0x54410002 0x3c000000
0000000000000120: 0x00000000 0x00000004 0x54410009 0x74736574
0000000000000130: 0x00000000 0x00000000 0x00000000 0x00000000
(qemu) xp /16i 0x100
0x00000100: 00000005 andeq r0, r0, r5
0x00000104: 54410001 strbpl r0, [r1], #-1
0x00000108: 00000001 andeq r0, r0, r1
0x0000010c: 00001000 andeq r1, r0, r0
0x00000110: 00000000 andeq r0, r0, r0
0x00000114: 00000004 andeq r0, r0, r4
0x00000118: 54410002 strbpl r0, [r1], #-2
0x0000011c: 3c000000 .byte 0x00, 0x00, 0x00, 0x3c
0x00000120: 54410001 strbpl r0, [r1], #-1
0x00000124: 00000001 andeq r0, r0, r1
0x00000128: 00001000 andeq r1, r0, r0
0x0000012c: 00000000 andeq r0, r0, r0
0x00000130: 00000004 andeq r0, r0, r4
0x00000134: 54410002 strbpl r0, [r1], #-2
0x00000138: 3c000000 .byte 0x00, 0x00, 0x00, 0x3c
0x0000013c: 00000000 andeq r0, r0, r0
(increasing length only results in more 00000000 andeq r0, r0, r0 Lines)
Version:
4.2.1Debian 1:4.2-3ubuntu6.6
Commandline:
qemu-system-arm -machine raspi2 --nographic -S -s -kernel ./vmlinuz --append "test"
./vmlinuz is a x64 linux kernel. I didn't care about architecture because i just wanted to see ATAG structure.
I also tried
qemu-system-arm -machine raspi2 --nographic -S -s -kernel ./overview.pdf --append "test"
same result.
I compiled Qemu 5.1.0
Same Problem.