On Tue, Mar 11, 2014 at 03:14:26PM -0700, Kameron Larsen wrote: > Hello, > > I'm bringing up a board based on the board/gaisler/gr_xc3s_1500/ design. To > keep things simple, we can use this design exactly as is. > > My problem starts in the relocation section of arch/sparc/cpu/leon3/start.S > which I'll paste here for convenience: > > /* un relocated start address of monitor */ > #define TEXT_START _text > > /* un relocated end address of monitor */ > #define DATA_END __init_end > > reloc: > set TEXT_START,%g2 > set DATA_END,%g3 > set CONFIG_SYS_RELOC_MONITOR_BASE,%g4 > reloc_loop: > ldd [%g2],%l0 > ldd [%g2+8],%l2 > std %l0,[%g4] > std %l2,[%g4+8] > inc 16,%g2 > subcc %g3,%g2,%g0 > bne reloc_loop > inc 16,%g4 > > As can be seen, this relies upon the location of the _text and __init_end > symbols. These symbols are only known to the linker and should be filled in > by the linker to point to the actual addresses within the compiled program. > I can see these addresses by running an objdump -x on the final u-boot > binary. The relevant portions are below: > > SYMBOL TABLE: > 00000000 g .text 00000000 _text > 00036000 g *ABS* 00000000 __init_end > > So 0x00000000, and 0x00036000 are the values I expect to be used for _text > and __init_end respectively. However, looking at the disassembled u-boot > binary (objdump -d), I see that they are not. Instead they are giving the > values of 0xd50 and 0xd44: > > sparc-elf-objdump -d u-boot: > 000010a4 <reloc>: > 10a4: 05 00 00 03 sethi %hi(0xc00), %g2 > 10a8: 84 10 a1 50 or %g2, 0x150, %g2 ! d50 > <MINFRAME+0xcf4> > 10ac: 07 00 00 03 sethi %hi(0xc00), %g3 > 10b0: 86 10 e1 44 or %g3, 0x144, %g3 ! d44 > <MINFRAME+0xce8> > 10b4: 09 10 fe 38 sethi %hi(0x43f8e000), %g4 > > 000010b8 <reloc_loop>: > 10b8: e0 18 80 00 ldd [ %g2 ], %l0 > 10bc: e4 18 a0 08 ldd [ %g2 + 8 ], %l2 > 10c0: e0 39 00 00 std %l0, [ %g4 ] > 10c4: e4 39 20 08 std %l2, [ %g4 + 8 ] > 10c8: 84 00 a0 10 add %g2, 0x10, %g2 > 10cc: 80 a0 c0 02 cmp %g3, %g2 > 10d0: 12 bf ff fa bne 10b8 <reloc_loop> > 10d4: 88 01 20 10 add %g4, 0x10, %g4 > > FWIW, MINFRAME is the last declared variable in start.S before this reloc > label. > > I've tried this with both the 3.4.4 and the 4.4.2 toolchains distributed by > Gaisler. Both behave the same way. > > Why isn't ld filling in the correct values of linker symbols?
Any ideas Daniel? Thanks! -- Tom
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