Problem with single stepping / backtrace on Black Magic Probe with an STM32F767ZG and latest official ARM gcc/gdb

trace.txt

GNU gdb (GNU Tools for ARM Embedded Processors 6-2017-q2-update) 7.12.1.20170417-git
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Reading symbols from Debug/FokliftController.elf...done.
Target voltage: 3.3V
Available Targets:
No. Att Driver
 1      STM32F7xx
_Error_Handler (file=0x0, line=0) at ../Src/main.c:534
534	  while(1) 
7BB37DAD:05:85
(gdb) load
Loading section .isr_vector, size 0x1f8 lma 0x8000000
Loading section .text, size 0xa374 lma 0x8000200
Loading section .rodata, size 0x880 lma 0x800a574
Loading section .ARM, size 0x8 lma 0x800adf4
Loading section .init_array, size 0x4 lma 0x800adfc
Loading section .fini_array, size 0x4 lma 0x800ae00
Loading section .data, size 0x12c lma 0x800ae04
Start address 0x8000620, load size 44840
Transfer rate: 18 KB/sec, 862 bytes/write.
(gdb) break StartDefaultTask
Breakpoint 1 at 0x800220c: file ../Src/main.c, line 492.
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/nick/burtek/FokliftController/Debug/FokliftController.elf 
Note: automatically using hardware breakpoints for read-only addresses.

Breakpoint 1, StartDefaultTask (argument=0x0) at ../Src/main.c:492
492		InitGraphics(&hltdc);
(gdb) p/x &hltdc
$1 = 0x2002fa04
(gdb) step
InitGraphics (pNewLCD=0x0) at ../Src/Graphics/graphics.c:141
141		pLCD = pNewLCD;
(gdb) p/x pNewLCD
$2 = 0x0
(gdb) p/x &pNewLCD
$3 = 0x2002be84
(gdb) disas
Dump of assembler code for function InitGraphics:
   0x08000698 <+0>:	push	{r7, lr}
   0x0800069a <+2>:	sub	sp, #16
   0x0800069c <+4>:	add	r7, sp, #0
   0x0800069e <+6>:	str	r0, [r7, #4]
=> 0x080006a0 <+8>:	ldr	r2, [pc, #204]	; (0x8000770 <InitGraphics+216>)
   0x080006a2 <+10>:	ldr	r3, [r7, #4]
   0x080006a4 <+12>:	str	r3, [r2, #0]
   0x080006a6 <+14>:	movs	r2, #0
   0x080006a8 <+16>:	movs	r1, #1
   0x080006aa <+18>:	ldr	r0, [pc, #200]	; (0x8000774 <InitGraphics+220>)
   0x080006ac <+20>:	bl	0x800648c <HAL_GPIO_WritePin>
   0x080006b0 <+24>:	movs	r0, #1
   0x080006b2 <+26>:	bl	0x800305c <osDelay>
   0x080006b6 <+30>:	ldr	r3, [pc, #184]	; (0x8000770 <InitGraphics+216>)
   0x080006b8 <+32>:	ldr	r0, [r3, #0]
   0x080006ba <+34>:	movs	r3, #0
   0x080006bc <+36>:	mov.w	r2, #256	; 0x100
   0x080006c0 <+40>:	ldr	r1, [pc, #180]	; (0x8000778 <InitGraphics+224>)
---Type <return> to continue, or q <return> to quit---q
Quit
(gdb) info registers
r0             0x2002fa04	537065988
r1             0x0	0
r2             0x0	0
r3             0x0	0
r4             0x0	0
r5             0x0	0
r6             0x0	0
r7             0x2002be80	537050752
r8             0x0	0
r9             0x0	0
r10            0x0	0
r11            0x0	0
r12            0x0	0
sp             0x2002be80	0x2002be80 <ucHeap+472>
lr             0x8002213	0x8002213 <StartDefaultTask+14>
pc             0x80006a0	0x80006a0 <InitGraphics+8>
xpsr           0x1000000	16777216
fpscr          0x0	0
msp            0x2007ffe0	0x2007ffe0
psp            0x2002be80	0x2002be80 <ucHeap+472>
special        0x2000000	33554432
(gdb) quit
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	Inferior 1 [Remote target] will be killed.

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