qemu-x86_64: debugging after relocation: breakpoints not working

[Matwey V. Kornilov]

Hi,

I failed to find the correct answer in this list. I am trying to debug
u-boot from the master running inside of QEMU 5.2.0:

I start QEMU as the following:

> qemu-system-x86_64 -bios u-boot.rom -serial stdio -hda sda -net none -S -s

And then attach to it using gdb 10.1:

> target remote 127.0.0.1:1234
> add-symbol-file /build/u-boot 0x06f49000
> break board_init_r
> info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   0x0000000006f5adfa in board_init_r at
/home/matwey/lab/u-boot/common/board_r.c:807
> cont

U-boot is running, however the breakpoint has never been triggered. I
also tried to use hardware assisted break instead of regular.
Breaking before the relocation works fine, so I suppose I am doing
something wrong with relocation addresses.

Address 0x06f49000 is taken from `bdinfo` output:

=> bdinfo
boot_params = 0x0000000000000000
DRAM bank   = 0x0000000000000000
-> start    = 0x0000000000000000
-> size     = 0x0000000008000000
flashstart  = 0x0000000000000000
flashsize   = 0x0000000000000000
flashoffset = 0x0000000000000000
baudrate    = 115200 bps
relocaddr   = 0x0000000006f49000
reloc off   = 0x0000000005e39000
Build       = 64-bit
current eth = unknown
ethaddr     = (not set)
IP addr     = <NULL>
fdt_blob    = 0x0000000006d07e30
new_fdt     = 0x0000000006d07e30
fdt_size    = 0x0000000000000bc0
Video       = vesa_video inactive
lmb_dump_all:
 memory.cnt  = 0x1
 memory[0]      [0x0-0x7ffffff], 0x08000000 bytes flags: 0
 reserved.cnt  = 0x0

Could somebody please point out to me what I do wrong? Thank you in advance.


-- 
With best regards,
Matwey V. Kornilov