On Thursday 13 October 2011 04:45:27 Daniel Hellstrom wrote:
On 10/13/2011 07:33 AM, Mike Frysinger wrote:
it seems that these symbols are usually implemented in the C library on sparc systems, but under u-boot, we don't have that luxury. Linux itself simply imports the relevant asm files from glibc into their lib subdir. without these, building u-boot for sparc targets with sparc linux compilers fail. any desire to make this work ? or just continue to force everyone to install a dedicated sparc-elf compiler ?
The .udiv/.rem ... functions are implemented by libgcc
that is target dependent
Sparc-linux toolchains will generate ELF binaries for Linux, that is not what we want?
the file format is fine, but the supplementary libgcc for sparc-linux targets does not include these symbols. it relies on the C library to provide them.
glibc sparc system: $ readelf -s /lib/libc.so.6 | grep '[.]u' 1231: 000f41e0 20 FUNC GLOBAL DEFAULT 10 .urem@@GLIBC_2.0 1369: 000f41a0 12 FUNC GLOBAL DEFAULT 10 .udiv@@GLIBC_2.0 1557: 000f4160 20 FUNC GLOBAL DEFAULT 10 .umul@@GLIBC_2.0
and if you look at gcc's source tree in gcc/config/sparc/t-*, you'll see that these libgcc routines are included for elf and leon targets, but not linux.
so whenever i build u-boot using a sparc-linux-gnu cross-compiler, it fails to link due to missing these symbols. if i use sparc-elf, it links fine. -mike