Re: [Qemu-devel] armv7m/stm32f205 not starting if code linked from 0x08000000

[Liviu Ionescu]

> On 08 Jun 2015, at 22:27, Peter Maydell <address@hidden> wrote:
> 
> That would also fix this problem, yes. It would still leave one
> use case wrong:
> * start QEMU
> * [cpu reset happens here; we load sp/pc]
> * in the debugger load an image (with a vector table) by writing it to RAM
> * let CPU run

I already fixed this for some time, after completing the load the debugger is 
configured to issue 'monitor system_reset', and this fetches again msp & pc 
from the freshly loaded image:

242,833 &"load \"/Users/ilg/My Files/MacBookPro Projects/GNU ARM 
Eclipse/Eclipse Workspaces/qemu-ima\
ges-44-osx/f1-h103-blink-sh-shd/Debug/f1-h103-blink-sh-shd.elf\"\n"
242,833 ~"Loading section .isr_vector, size 0x354 lma 0x8000000\n"
242,833 
21+download,{section=".isr_vector",section-size="852",total-size="457307"}
242,833 
21+download,{section=".isr_vector",section-sent="852",section-size="852",total-sent="852",to\
tal-size="457307"}
242,833 ~"Loading section .inits, size 0x28 lma 0x8000354\n"
242,833 21+download,{section=".inits",section-size="40",total-size="457307"}
242,833 ~"Loading section .text, size 0x23a0 lma 0x800037c\n"
242,834 21+download,{section=".text",section-size="9120",total-size="457307"}
242,834 ~"Loading section .data, size 0x84 lma 0x800271c\n"
242,835 21+download,{section=".data",section-size="132",total-size="457307"}
242,835 ~"Start address 0x800010c, load size 10144\n"
242,835 ~"Transfer rate: 4953 KB/sec, 1268 bytes/write.\n"
242,838 21^done
242,838 (gdb) 
242,839 22-gdb-show --thread-group i1 language
242,839 22^done,value="auto"
242,839 (gdb) 
242,840 23-gdb-set --thread-group i1 language c
242,840 23^done
242,840 (gdb) 
242,841 24-interpreter-exec --thread-group i1 console "p/x (char)-1"
242,841 ~"$1 = 0xff\n"
242,842 24^done
242,842 (gdb) 
242,843 25-data-evaluate-expression --thread-group i1 "sizeof (void*)"
242,844 25^done,value="4"
242,844 (gdb) 
242,845 26-gdb-set --thread-group i1 language auto
242,845 26^done
242,845 (gdb) 
242,846 27-interpreter-exec --thread-group i1 console "show endian"
242,847 ~"The target endianness is set automatically (currently little 
endian)\n"
242,847 27^done
242,847 (gdb) 
242,858 28-break-insert --thread-group i1 -t -f "\"/Users/ilg/My 
Files/MacBookPro Projects/GNU ARM E\
clipse/Eclipse 
Workspaces/qemu-images-44-osx/f1-h103-blink-sh-shd/system/src/newlib/_startup.c\":_st\
art"
242,858 29-break-insert --thread-group i1 -t -d -f "\"/Users/ilg/My 
Files/MacBookPro Projects/GNU AR\
M Eclipse/Eclipse 
Workspaces/qemu-images-44-osx/f1-h103-blink-sh-shd/src/main.cpp\":main"
242,860 
28^done,bkpt={number="1",type="breakpoint",disp="del",enabled="y",addr="0x0800010c",func="_s\
tart",file="../system/src/newlib/_startup.c",fullname="/Users/ilg/My 
Files/MacBookPro Projects/GNU A\
RM Eclipse/Eclipse 
Workspaces/qemu-images-44-osx/f1-h103-blink-sh-shd/system/src/newlib/_startup.c",\
line="224",thread-groups=["i1"],times="0",original-location="/Users/ilg/My 
Files/MacBookPro Projects\
/GNU ARM Eclipse/Eclipse 
Workspaces/qemu-images-44-osx/f1-h103-blink-sh-shd/system/src/newlib/_start\
up.c:_start"}
242,860 (gdb) 
242,861 
29^done,bkpt={number="2",type="breakpoint",disp="del",enabled="n",addr="0x08000fe8",func="ma\
in(int, char**)",file="../src/main.cpp",fullname="/Users/ilg/My 
Files/MacBookPro Projects/GNU ARM Ec\
lipse/Eclipse 
Workspaces/qemu-images-44-osx/f1-h103-blink-sh-shd/src/main.cpp",line="70",thread-grou\
ps=["i1"],times="0",original-location="/Users/ilg/My Files/MacBookPro 
Projects/GNU ARM Eclipse/Eclip\
se Workspaces/qemu-images-44-osx/f1-h103-blink-sh-shd/src/main.cpp:main"}
242,861 (gdb) 
242,867 30monitor system_reset
242,867 31tbreak _start
242,867 32continue
242,869 &"monitor system_reset\n"
242,871 30^done
242,871 (gdb) 


regards,

Liviu


p.s. please note that the gdb elf loader processes the correct sections, not 
the segments.