* Question ARM sim target and Cortex M
@ 2020-10-24 9:02 Fredrik Hederstierna
2020-10-26 13:55 ` Luis Machado
0 siblings, 1 reply; 2+ messages in thread
From: Fredrik Hederstierna @ 2020-10-24 9:02 UTC (permalink / raw)
To: gdb
Hi,
I have a question about using ARM target simulator and bare metal Cortex M elf.
I tried to start my arm-none-eabi with my program:
$ arm-none-eabi-gdb myprog.elf
...
(gdb) target sim
Connected to the simulator.
(gdb) load
Loading section .text, size 0x549f0 lma 0x2800
Loading section .data, size 0x934 lma 0x571f0
Loading section .ARM.exidx, size 0x8 lma 0x57b24
Start address 0x28ff
Transfer rate: 2791776 bits in <1 sec.
(gdb) run
Starting program: /home/fredrik/build/myprog.elf
Unknown machine type '22'; please update sim_create_inferior.
[Inferior 1 (process 42000) exited normally]
(gdb)
Looking in <sim/arm/wrapper.c> I see missing handling alot of newer targets > arm_5?
Looking in <bfd/bfd-in2.h>:
bfd/bfd-in2.h:#define bfd_mach_arm_5TEJ 14
bfd/bfd-in2.h:#define bfd_mach_arm_6 15
bfd/bfd-in2.h:#define bfd_mach_arm_6KZ 16
bfd/bfd-in2.h:#define bfd_mach_arm_6T2 17
bfd/bfd-in2.h:#define bfd_mach_arm_6K 18
bfd/bfd-in2.h:#define bfd_mach_arm_7 19
bfd/bfd-in2.h:#define bfd_mach_arm_6M 20
bfd/bfd-in2.h:#define bfd_mach_arm_6SM 21
bfd/bfd-in2.h:#define bfd_mach_arm_7EM 22
bfd/bfd-in2.h:#define bfd_mach_arm_8 23
bfd/bfd-in2.h:#define bfd_mach_arm_8R 24
bfd/bfd-in2.h:#define bfd_mach_arm_8M_BASE 25
bfd/bfd-in2.h:#define bfd_mach_arm_8M_MAIN 26
bfd/bfd-in2.h:#define bfd_mach_arm_8_1M_MAIN 27
My target is Cortex-M4 so its ID '22' meaning <bfd_mach_arm_7EM>,
cannot I run Cortex-M4 in target simulator, or what do I do wrong here?
Are there more targets that could be added in eg <sim/arm/wrapper.c>, or am I looking in the wrong place?
Thanks! BR Fredrik
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Question ARM sim target and Cortex M
2020-10-24 9:02 Question ARM sim target and Cortex M Fredrik Hederstierna
@ 2020-10-26 13:55 ` Luis Machado
0 siblings, 0 replies; 2+ messages in thread
From: Luis Machado @ 2020-10-26 13:55 UTC (permalink / raw)
To: Fredrik Hederstierna, gdb
Hi Fredrik,
On 10/24/20 6:02 AM, Fredrik Hederstierna via Gdb wrote:
> Hi,
>
> I have a question about using ARM target simulator and bare metal Cortex M elf.
>
> I tried to start my arm-none-eabi with my program:
>
> $ arm-none-eabi-gdb myprog.elf
> ...
> (gdb) target sim
> Connected to the simulator.
> (gdb) load
> Loading section .text, size 0x549f0 lma 0x2800
> Loading section .data, size 0x934 lma 0x571f0
> Loading section .ARM.exidx, size 0x8 lma 0x57b24
> Start address 0x28ff
> Transfer rate: 2791776 bits in <1 sec.
> (gdb) run
> Starting program: /home/fredrik/build/myprog.elf
> Unknown machine type '22'; please update sim_create_inferior.
> [Inferior 1 (process 42000) exited normally]
> (gdb)
>
> Looking in <sim/arm/wrapper.c> I see missing handling alot of newer targets > arm_5?
> Looking in <bfd/bfd-in2.h>:
>
> bfd/bfd-in2.h:#define bfd_mach_arm_5TEJ 14
> bfd/bfd-in2.h:#define bfd_mach_arm_6 15
> bfd/bfd-in2.h:#define bfd_mach_arm_6KZ 16
> bfd/bfd-in2.h:#define bfd_mach_arm_6T2 17
> bfd/bfd-in2.h:#define bfd_mach_arm_6K 18
> bfd/bfd-in2.h:#define bfd_mach_arm_7 19
> bfd/bfd-in2.h:#define bfd_mach_arm_6M 20
> bfd/bfd-in2.h:#define bfd_mach_arm_6SM 21
> bfd/bfd-in2.h:#define bfd_mach_arm_7EM 22
> bfd/bfd-in2.h:#define bfd_mach_arm_8 23
> bfd/bfd-in2.h:#define bfd_mach_arm_8R 24
> bfd/bfd-in2.h:#define bfd_mach_arm_8M_BASE 25
> bfd/bfd-in2.h:#define bfd_mach_arm_8M_MAIN 26
> bfd/bfd-in2.h:#define bfd_mach_arm_8_1M_MAIN 27
>
> My target is Cortex-M4 so its ID '22' meaning <bfd_mach_arm_7EM>,
> cannot I run Cortex-M4 in target simulator, or what do I do wrong here?
> Are there more targets that could be added in eg <sim/arm/wrapper.c>, or am I looking in the wrong place?
>
> Thanks! BR Fredrik
>
Overall, the ARM/AArch64 sim targets should not be considered up-to-date
nor complete. In fact, I think they are fairly outdated and shouldn't be
considered for any serious simulator-based work/testing. Only casual
trivial testing.
I'd recommend QEMU instead, which is much better supported in terms of
features.
Of course, folks are welcome to update the sim targets.
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2020-10-24 9:02 Question ARM sim target and Cortex M Fredrik Hederstierna
2020-10-26 13:55 ` Luis Machado
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