TMS320F28034: memcpy() generate infinite recursive cycle

Hi Sergey,

Please could you provide more details on your observation? Are you using the standard memcpy command to copy functions to RAM found in the C2000Ware Flash examples and noticing this behavior or are you doing something special?

Can you let me know how the RamfuncsRunStart, RamfuncsLoadStart, RamfuncsLoadSize are defined in your linker command file?

Thanks,

Ashwini

Hi.

I include <string.h> from standart compiler library, where

_CODE_ACCESS void *memcpy(void * __restrict s1,
const void * __restrict s2, size_t n);

In linker script

MEMORY
{
PAGE 0:
RAML1       : origin = 0x008800, length = 0x000400
FLASHFEDC      : origin = 0x3EC002, length = 0x007FDA
...

ramfuncs : LOAD = FLASHFEDC,
RUN = RAML1,
LOAD_START(_RamfuncsLoadStart),
LOAD_SIZE(_RamfuncsLoadSize),
LOAD_END(_RamfuncsLoadEnd),
RUN_START(_RamfuncsRunStart),
PAGE = 0

If I change size of copy data to 255 or less, then memcpy compiled to inline code and work

505 memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, 255);
3ecdbc: 76FF0AF5 MOVL XAR7, #0x3f0af5
3ecdbe: 8F008800 MOVL XAR4, #0x008800
3ecdc0: F6FE RPT #254
3ecdc1: 2484 || PREAD *XAR4++, *XAR7

===================================================================

I looked in my other project, and there memcpy disassembled correct:

memcpy():
3f16d1: 5200 CMPB AL, #0x0
40 {
3f16d2: A8AB MOVL @P, XAR4
3f16d3: C5A4 MOVL XAR7, @XAR4
51 for (rn = 0; rn < nn; rn++) *rto++ = *rfrom++;
3f16d4: 6107 SB C$L2, EQ
3f16d5: 88A9 MOVZ AR6, @AL
3f16d6: DE81 SUBB XAR6, #1
C$L1:
3f16d7: 5C85 MOVZ AR4, *XAR5++
3f16d8: 7C87 MOV *XAR7++, AR4
3f16d9: 000EFFFE BANZ -2,AR6--
52 if (nn == n) return (to);
C$L2:
3f16db: 88A9 MOVZ AR6, @AL
3f16dc: 0FA6 CMPL ACC, @XAR6
3f16dd: 610F SB C$L5, EQ
3f16de: 5300 CMPB AH, #0x0
3f16df: 610D SB C$L5, EQ
3f16e0: 9DFF ADDB AH, #-1
3f16e1: 5CA8 MOVZ AR4, @AH
C$L3:
3f16e2: 76BFFFFE MOVL XAR6, #0x3ffffe
64 *rto++ = *rfrom++;
C$L4:
3f16e4: 9285 MOV AL, *XAR5++
3f16e5: 9687 MOV *XAR7++, AL
63 for (rn = 0; rn < 65535; rn++)
3f16e6: 000EFFFE BANZ -2,AR6--
65 *rto++ = *rfrom++;
3f16e8: 9285 MOV AL, *XAR5++
3f16e9: 9687 MOV *XAR7++, AL
61 for (tmp = 0; tmp < upper; tmp++)
3f16ea: 000CFFF8 BANZ -8,AR4--
69 return (to);
C$L5:
3f16ec: A9A4 MOVL @XAR4, P
3f16ed: 0006 LRETR

Maybe need include or define something else?

Hi Sergey,

I will follow up with the Compiler team and let you know.

Thanks,

Ashwini