TMS570LS3137: Cortex R4 runtime library

Hi Varban,

You are correct, i too can see it in 20.2.5LTS

rtsv7R4_A_be_v3D16_eabi

And didn't find in 20.2.7LTS

Let me check with compiler team, i will provide my update ASAP.

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Thanks & regards,
Jagadish.

Hi Varban,

Here is the compiler team feedback for the questions:

Yes, it is intentionally removed in newer compiler versions.

The compiler no longer ships with all libraries pre-compiled. They only ship with a few common ones. However, all the source for the RTS comes with the compiler so if determines that it needs an RTS that is not pre-compiled, then it will build it then and there.

That is what happened in your 20.2.5 install. Notice in your screenshot that the library has a different (newer) timestamp than the others. It's because it was not pre-compiled like the others.

The compiler team did this, to reduce the download size of the compiler packages.

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Thanks & regards,
Jagadish.

Hi Jagadish,

Alright, but the "rtsv7R4_T_be_v3D16_eabi.lib " is a precompiled library and we are linking against it.

Building target: "GIO.out"
Invoking: Arm Linker
 .... "../GIO/source/sys_link.cmd"  -lrtsv7R4_T_be_v3D16_eabi.lib 
<Linking>
Finished building target: "GIO.out"
 

**** Build Finished ****

And as a result of this, the stdlib/string/stdio function calls will end up being executed in Thumb mode instead of pure ARM mode.

Using 20.2.7.LTS, when I compile my example and disassemble it, I get the things like those (all in .thumb sections):

012a7e:              memcpy:
012a7e:               .thumb
012a7e: 2A00             CMP             R2, #0
012a80: D04A             BEQ             _ret2_ [0x12b18]
012a82: EA5F0C00         MOVS.W          R12, R0
012a86: 078B             LSLS            R3, R1, #30
012a88: D11C             BNE             _unaln [0x12ac4]
012a8a: 0783             LSLS            R3, R0, #30
012a8c: D122             BNE             _saln [0x12ad4]
012a8e:              _aln:

012bb4:               .thumb
012bb4:              .text:fputc:
012bb4: 4A21             LDR             R2, $C$CON1 [0x12c3c]
012bb6: B5F8             PUSH            {R3, R4, R5, R6, R7, LR}
012bb8: 6812             LDR             R2, [R2]
012bba: 460C             MOV             R4, R1
012bbc: 4605             MOV             R5, R0
012bbe: 4790             BLX             R2
012bc0: 4620             MOV             R0, R4
012bc2: F000FA3B         BL              __TI_wrt_ok [0x1303c]
012bc6: 2800             CMP             R0, #0
012bc8: 4E1D             LDR             R6, $C$CON2 [0x12c40]

012cbe:               .thumb
012cbe: 2200             MOVS            R2, #0
012cc0:              __aeabi_memset4:
012cc0:              __aeabi_memset8:
012cc0:              __aeabi_memset:
012cc0: 4613             MOV             R3, R2
012cc2: 460A             MOV             R2, R1
012cc4: 4619             MOV             R1, R3
012cc6:              memset:
012cc6: B571             PUSH            {R0, R4, R5, R6, LR}
012cc8: F0100F03         TST.W           R0, #3
012ccc: D00B             BEQ             _word_aligned [0x12ce6]

I still cannot understand the motives of the compiler team - having in mind that the little-endian RTS is there, I can't figure out why the BE lib is not there as well. And as far as I remember, I installed CCS with only Hercules support, which is a "hardwired" big endian-only device.

But... never mind. Let's summarise my request this way: in case I want a pure ARM (Thumb-free) executable, is there a way to achieve it? I won't mind compiling everything from source, without linking against any .libs, as long this is a "stable" and recommended approach in the context of the Hercules toolchain.

Thanks,

Varban

Hi Varban,

I am discussing your questions again with our compiler team experts and will try to provide my updates as soon as possible.

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Thanks & regards,
Jagadish.

Hi George,

So... in case I need an RTS in ARM mode instead of Thumb, I need to manually compile it by myself? Because the current version of the toolchain does not come with that one as a precompiled .lib.

Do I understand you correctly?