Need information on align_cpy_1 function

Hi,
Our application crached with a SIGBUS error when executing memcpy().
When we run debugger on the core file, the end of stack shows a call to align_cpy_1.
From our code we call memcpy() to copy 8088 bytes. but the stack shows align_cpy_1
with the following parameters
align_cpy_1(0xfe86e000, 0xffbfb598, 0x1c00, 0x0, 0x4, 0xfffffff8)
I am assuming here the third parameter sent is number of bytes in hex. (7168 in decimal).
I have read that align_cpy_1 functions are platform specific library routines in libc_psr.so.
Can anybody provide information on how this fucntion call works.
Is it internally called by kernel to copy by block sizes. ??
Thanks very much for the reply.

I believe you can find your answer on cvs.opensolaris.org:
http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc_psr/sun4v/common/memcpy.s#278
If that's not your guy (libc_psr is processor-specific and you didn't say what yours is), take a look at search results: [http://cvs.opensolaris.org/source/search?q=__align_cpy_1]
Here's how it is organized: libc.so.1 is an auxiliary filter for libc_psr.so (read more about auxiliary filters here: http://docs.sun.com/app/docs/doc/806-0641/6j9vuquja?q=PLT&a=view). Essentially, it means that linker will use memcpy() from libc_psr.so instead of libc.so.1, if it's present. And it is:
$ elfdump -s /platform/.../lib/libc_psr.so.1 | grep memcpy
[27] 0x00000408 0x0000063c FUNC GLOB D    0 .text          _memcpy
[34] 0x00000408 0x0000063c FUNC WEAK D    0 .text          memcpyNotice that memcpy is a weak symbol with the same value as global symbol memcpy, which means that memcpy will actually be called. Another grep reveals several other symbols sharing the same value (address):
$ elfdump -s /platform/.../lib/libc_psr.so.1 | grep 0x00000408
[17] 0x00000408 0x0000063c FUNC LOCL H    0 .text          __align_cpy_1
[19] 0x00000408 0x00000000 NOTY LOCL D    0 .text          forcpy
[27] 0x00000408 0x0000063c FUNC GLOB D    0 .text          _memcpy
[34] 0x00000408 0x0000063c FUNC WEAK D    0 .text          memcpyIt aligns perfectly with source code found in memcpy.s:
http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc_psr/sun4u/common/memcpy.s#136
    136      ENTRY(memcpy)
    137      ENTRY(__align_cpy_1)
    138 forcpy:
    139      ...
    As you can see, there are three labels for the same entry point, so the debugger is free to choose any of them when it translates address to a symbol.
Another thing: you can't generally rely on correct values of function parameters reported by a debugger for functions without debug info. What is shown here is simply contents of registers (%i0 through %i5), which called function is free to change. These values have more chances to be correct at the very beginning of the function, but again, it's not 100% reliable.

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1 Retail pricing
2 Retail Industry
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[edit] Retail pricing
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